From b25deea21d5c3ccf7b0352b1d4297a17558b9443 Mon Sep 17 00:00:00 2001 From: zadam Date: Fri, 22 Feb 2019 23:03:20 +0100 Subject: [PATCH] fixes for relative paths --- src/public/javascripts/services/note_detail_image.js | 2 +- src/public/javascripts/services/note_tooltip.js | 2 +- src/public/javascripts/setup.js | 2 +- src/public/libraries/ckeditor/ckeditor.js | 2 +- src/public/libraries/ckeditor/ckeditor.js.map | 2 +- src/services/image.js | 2 +- src/services/notes.js | 3 ++- 7 files changed, 8 insertions(+), 7 deletions(-) diff --git a/src/public/javascripts/services/note_detail_image.js b/src/public/javascripts/services/note_detail_image.js index b7e172e62..592d382c0 100644 --- a/src/public/javascripts/services/note_detail_image.js +++ b/src/public/javascripts/services/note_detail_image.js @@ -26,7 +26,7 @@ async function show() { $fileSize.text((attributeMap.fileSize || "?") + " bytes"); $fileType.text(currentNote.mime); - $imageView.prop("src", `/api/images/${currentNote.noteId}/${currentNote.title}`); + $imageView.prop("src", `api/images/${currentNote.noteId}/${currentNote.title}`); } $imageDownloadButton.click(() => utils.download(getFileUrl())); diff --git a/src/public/javascripts/services/note_tooltip.js b/src/public/javascripts/services/note_tooltip.js index 9590fb8b7..c546bdd77 100644 --- a/src/public/javascripts/services/note_tooltip.js +++ b/src/public/javascripts/services/note_tooltip.js @@ -122,7 +122,7 @@ async function renderTooltip(note, attributes) { } else if (note.type === 'image') { content += $("") - .prop("src", `/api/images/${note.noteId}/${note.title}`) + .prop("src", `api/images/${note.noteId}/${note.title}`) .prop('outerHTML'); } // other types of notes don't have tooltip preview diff --git a/src/public/javascripts/setup.js b/src/public/javascripts/setup.js index 473b80391..9b391a5b0 100644 --- a/src/public/javascripts/setup.js +++ b/src/public/javascripts/setup.js @@ -91,7 +91,7 @@ function SetupModel() { } // not using server.js because it loads too many dependencies - const resp = await $.post('/api/setup/sync-from-server', { + const resp = await $.post('api/setup/sync-from-server', { syncServerHost: syncServerHost, syncProxy: syncProxy, username: username, diff --git a/src/public/libraries/ckeditor/ckeditor.js b/src/public/libraries/ckeditor/ckeditor.js index b9e069b77..60948ca5c 100644 --- a/src/public/libraries/ckeditor/ckeditor.js +++ b/src/public/libraries/ckeditor/ckeditor.js @@ -2,5 +2,5 @@ * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. 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this.position=Go._createAfter(n),this._next();o=n.data[t.offset]}else o=n.getChild(t.offset);if(o instanceof go)return this.shallow?t.offset++:t=new Go(o,0),this.position=t,this._formatReturnValue("elementStart",o,e,t,1);if(o instanceof co){if(this.singleCharacters)return t=new Go(o,0),this.position=t,this._next();{let n,i=o.data.length;return o==this._boundaryEndParent?(i=this.boundaries.end.offset,n=new lo(o,0,i),t=Go._createAfter(n)):(n=new lo(o,0,o.data.length),t.offset++),this.position=t,this._formatReturnValue("text",n,e,t,i)}}if("string"==typeof o){let o;if(this.singleCharacters)o=1;else{o=(n===this._boundaryEndParent?this.boundaries.end.offset:n.data.length)-t.offset}const i=new lo(n,t.offset,o);return t.offset+=o,this.position=t,this._formatReturnValue("text",i,e,t,o)}return t=Go._createAfter(n),this.position=t,this.ignoreElementEnd?this._next():this._formatReturnValue("elementEnd",n,e,t)}_previous(){let t=this.position.clone();const e=this.position,n=t.parent;if(null===n.parent&&0===t.offset)return{done:!0};if(n==this._boundaryStartParent&&t.offset==this.boundaries.start.offset)return{done:!0};let o;if(n instanceof co){if(t.isAtStart)return this.position=Go._createBefore(n),this._previous();o=n.data[t.offset-1]}else o=n.getChild(t.offset-1);if(o instanceof go)return this.shallow?(t.offset--,this.position=t,this._formatReturnValue("elementStart",o,e,t,1)):(t=new Go(o,o.childCount),this.position=t,this.ignoreElementEnd?this._previous():this._formatReturnValue("elementEnd",o,e,t));if(o instanceof co){if(this.singleCharacters)return t=new Go(o,o.data.length),this.position=t,this._previous();{let n,i=o.data.length;if(o==this._boundaryStartParent){const e=this.boundaries.start.offset;i=(n=new lo(o,e,o.data.length-e)).data.length,t=Go._createBefore(n)}else n=new lo(o,0,o.data.length),t.offset--;return this.position=t,this._formatReturnValue("text",n,e,t,i)}}if("string"==typeof o){let o;if(this.singleCharacters)o=1;else{const e=n===this._boundaryStartParent?this.boundaries.start.offset:0;o=t.offset-e}t.offset-=o;const i=new lo(n,t.offset,o);return this.position=t,this._formatReturnValue("text",i,e,t,o)}return t=Go._createBefore(n),this.position=t,this._formatReturnValue("elementStart",n,e,t,1)}_formatReturnValue(t,e,n,o,i){return e instanceof lo&&(e.offsetInText+e.data.length==e.textNode.data.length&&("forward"!=this.direction||this.boundaries&&this.boundaries.end.isEqual(this.position)?n=Go._createAfter(e.textNode):(o=Go._createAfter(e.textNode),this.position=o)),0===e.offsetInText&&("backward"!=this.direction||this.boundaries&&this.boundaries.start.isEqual(this.position)?n=Go._createBefore(e.textNode):(o=Go._createBefore(e.textNode),this.position=o))),{done:!1,value:{type:t,item:e,previousPosition:n,nextPosition:o,length:i}}}}class Go{constructor(t,e){this.parent=t,this.offset=e}get nodeAfter(){return this.parent.is("text")?null:this.parent.getChild(this.offset)||null}get nodeBefore(){return this.parent.is("text")?null:this.parent.getChild(this.offset-1)||null}get isAtStart(){return 0===this.offset}get isAtEnd(){const t=this.parent.is("text")?this.parent.data.length:this.parent.childCount;return this.offset===t}get root(){return this.parent.root}get editableElement(){let t=this.parent;for(;!(t instanceof Uo);){if(!t.parent)return null;t=t.parent}return t}getShiftedBy(t){const e=Go._createAt(this),n=e.offset+t;return e.offset=n<0?0:n,e}getLastMatchingPosition(t,e={}){e.startPosition=this;const n=new Ko(e);return n.skip(t),n.position}getAncestors(){return this.parent.is("documentFragment")?[this.parent]:this.parent.getAncestors({includeSelf:!0})}getCommonAncestor(t){const e=this.getAncestors(),n=t.getAncestors();let o=0;for(;e[o]==n[o]&&e[o];)o++;return 0===o?null:e[o-1]}isEqual(t){return 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t?t.start.clone():null}getLastPosition(){const t=this.getLastRange();return t?t.end.clone():null}isEqual(t){if(this.isFake!=t.isFake)return!1;if(this.isFake&&this.fakeSelectionLabel!=t.fakeSelectionLabel)return!1;if(this.rangeCount!=t.rangeCount)return!1;if(0===this.rangeCount)return!0;if(!this.anchor.isEqual(t.anchor)||!this.focus.isEqual(t.focus))return!1;for(const e of this._ranges){let n=!1;for(const o of t._ranges)if(e.isEqual(o)){n=!0;break}if(!n)return!1}return!0}isSimilar(t){if(this.isBackward!=t.isBackward)return!1;const e=Xo(this.getRanges());if(e!=Xo(t.getRanges()))return!1;if(0==e)return!0;for(let e of this.getRanges()){e=e.getTrimmed();let n=!1;for(let o of t.getRanges())if(o=o.getTrimmed(),e.start.isEqual(o.start)&&e.end.isEqual(o.end)){n=!0;break}if(!n)return!1}return!0}getSelectedElement(){if(1!==this.rangeCount)return null;const t=this.getFirstRange(),e=t.start.nodeAfter,n=t.end.nodeBefore;return e instanceof go&&e==n?e:null}setTo(t,e,n){if(null===t)this._setRanges([]),this._setFakeOptions(e);else if(t instanceof Yo||t instanceof Zo)this._setRanges(t.getRanges(),t.isBackward),this._setFakeOptions({fake:t.isFake,label:t.fakeSelectionLabel});else if(t instanceof Jo)this._setRanges([t],e&&e.backward),this._setFakeOptions(e);else if(t instanceof Go)this._setRanges([new Jo(t)]),this._setFakeOptions(e);else if(t instanceof ao){const o=!!n&&!!n.backward;let i;if(void 0===e)throw new T.b("view-selection-setTo-required-second-parameter: selection.setTo requires the second parameter when the first parameter is a node.");i="in"==e?Jo._createIn(t):"on"==e?Jo._createOn(t):new Jo(Go._createAt(t,e)),this._setRanges([i],o),this._setFakeOptions(n)}else{if(!uo(t))throw new T.b("view-selection-setTo-not-selectable: Cannot set selection to given place.");this._setRanges(t,e&&e.backward),this._setFakeOptions(e)}this.fire("change")}setFocus(t,e){if(null===this.anchor)throw new T.b("view-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.");const n=Go._createAt(t,e);if("same"==n.compareWith(this.focus))return;const o=this.anchor;this._ranges.pop(),"before"==n.compareWith(o)?this._addRange(new Jo(n,o),!0):this._addRange(new Jo(o,n)),this.fire("change")}_setRanges(t,e=!1){t=Array.from(t),this._ranges=[];for(const e of t)this._addRange(e);this._lastRangeBackward=!!e}_setFakeOptions(t={}){this._isFake=!!t.fake,this._fakeSelectionLabel=t.fake&&t.label||""}_addRange(t,e=!1){if(!(t instanceof Jo))throw new T.b("view-selection-add-range-not-range: Selection range set to an object that is not an instance of view.Range");this._pushRange(t),this._lastRangeBackward=!!e}_pushRange(t){for(const e of this._ranges)if(t.isIntersecting(e))throw new T.b("view-selection-range-intersects: Trying to add a range that intersects with another range from selection.",{addedRange:t,intersectingRange:e});this._ranges.push(new Jo(t.start,t.end))}}j(Yo,M);class Zo{constructor(t=null,e,n){this._selection=new Yo,this._selection.delegate("change").to(this),this._selection.setTo(t,e,n)}get isFake(){return this._selection.isFake}get fakeSelectionLabel(){return this._selection.fakeSelectionLabel}get anchor(){return this._selection.anchor}get focus(){return this._selection.focus}get isCollapsed(){return this._selection.isCollapsed}get rangeCount(){return this._selection.rangeCount}get isBackward(){return this._selection.isBackward}get editableElement(){return this._selection.editableElement}get _ranges(){return this._selection._ranges}*getRanges(){yield*this._selection.getRanges()}getFirstRange(){return this._selection.getFirstRange()}getLastRange(){return this._selection.getLastRange()}getFirstPosition(){return this._selection.getFirstPosition()}getLastPosition(){return this._selection.getLastPosition()}getSelectedElement(){return this._selection.getSelectedElement()}isEqual(t){return this._selection.isEqual(t)}isSimilar(t){return this._selection.isSimilar(t)}_setTo(t,e,n){this._selection.setTo(t,e,n)}_setFocus(t,e){this._selection.setFocus(t,e)}}j(Zo,M);class ti{constructor(t={}){this._items=[],this._itemMap=new Map,this._idProperty=t.idProperty||"id",this._bindToExternalToInternalMap=new WeakMap,this._bindToInternalToExternalMap=new WeakMap,this._skippedIndexesFromExternal=[]}get length(){return this._items.length}get first(){return this._items[0]||null}get last(){return this._items[this.length-1]||null}add(t,e){let n;const o=this._idProperty;if(o in t){if("string"!=typeof(n=t[o]))throw new T.b("collection-add-invalid-id");if(this.get(n))throw new T.b("collection-add-item-already-exists")}else t[o]=n=R();if(void 0===e)e=this._items.length;else if(e>this._items.length||e<0)throw new T.b("collection-add-item-invalid-index");return this._items.splice(e,0,t),this._itemMap.set(n,t),this.fire("add",t,e),this}get(t){let e;if("string"==typeof t)e=this._itemMap.get(t);else{if("number"!=typeof t)throw new T.b("collection-get-invalid-arg: Index or id must be given.");e=this._items[t]}return e||null}getIndex(t){let e;return e="string"==typeof t?this._itemMap.get(t):t,this._items.indexOf(e)}remove(t){let e,n,o,i=!1;const r=this._idProperty;if("string"==typeof t?(n=t,i=!(o=this._itemMap.get(n)),o&&(e=this._items.indexOf(o))):"number"==typeof t?(e=t,i=!(o=this._items[e]),o&&(n=o[r])):(n=(o=t)[r],i=-1==(e=this._items.indexOf(o))||!this._itemMap.get(n)),i)throw new T.b("collection-remove-404: Item not found.");this._items.splice(e,1),this._itemMap.delete(n);const s=this._bindToInternalToExternalMap.get(o);return this._bindToInternalToExternalMap.delete(o),this._bindToExternalToInternalMap.delete(s),this.fire("remove",o,e),o}map(t,e){return this._items.map(t,e)}find(t,e){return this._items.find(t,e)}filter(t,e){return this._items.filter(t,e)}clear(){for(this._bindToCollection&&(this.stopListening(this._bindToCollection),this._bindToCollection=null);this.length;)this.remove(0)}bindTo(t){if(this._bindToCollection)throw new T.b("collection-bind-to-rebind: The collection cannot be bound more than once.");return this._bindToCollection=t,{as:t=>{this._setUpBindToBinding(e=>new t(e))},using:t=>{"function"==typeof t?this._setUpBindToBinding(e=>t(e)):this._setUpBindToBinding(e=>e[t])}}}_setUpBindToBinding(t){const e=this._bindToCollection,n=(n,o,i)=>{const r=e._bindToCollection==this,s=e._bindToInternalToExternalMap.get(o);if(r&&s)this._bindToExternalToInternalMap.set(o,s),this._bindToInternalToExternalMap.set(s,o);else{const n=t(o);if(!n)return void this._skippedIndexesFromExternal.push(i);let r=i;for(const t of this._skippedIndexesFromExternal)i>t&&r--;for(const t of e._skippedIndexesFromExternal)r>=t&&r++;this._bindToExternalToInternalMap.set(o,n),this._bindToInternalToExternalMap.set(n,o),this.add(n,r);for(let t=0;t{const o=this._bindToExternalToInternalMap.get(e);o&&this.remove(o),this._skippedIndexesFromExternal=this._skippedIndexesFromExternal.reduce((t,e)=>(ne&&t.push(e),t),[])})}[Symbol.iterator](){return this._items[Symbol.iterator]()}}j(ti,M);class ei{constructor(){this.selection=new Zo,this.roots=new ti({idProperty:"rootName"}),this.set("isReadOnly",!1),this.set("isFocused",!1),this.set("isComposing",!1),this._postFixers=new Set}getRoot(t="main"){return this.roots.get(t)}registerPostFixer(t){this._postFixers.add(t)}_callPostFixers(t){let e=!1;do{for(const n of this._postFixers)if(e=n(t))break}while(e)}}j(ei,Fo);const ni=10;class oi extends go{constructor(t,e,n){super(t,e,n),this.getFillerOffset=ii,this._priority=ni,this._id=null,this._clonesGroup=null}get priority(){return this._priority}get id(){return this._id}getElementsWithSameId(){if(null===this.id)throw new T.b("attribute-element-get-elements-with-same-id-no-id: Cannot get elements with the same id for an attribute element without id.");return new Set(this._clonesGroup)}is(t,e=null){return e?"attributeElement"==t&&e==this.name||super.is(t,e):"attributeElement"==t||super.is(t)}isSimilar(t){return null!==this.id||null!==t.id?this.id===t.id:super.isSimilar(t)&&this.priority==t.priority}_clone(t){const e=super._clone(t);return e._priority=this._priority,e._id=this._id,e}}function ii(){if(ri(this))return null;let t=this.parent;for(;t&&t.is("attributeElement");){if(ri(t)>1)return null;t=t.parent}return!t||ri(t)>1?null:this.childCount}function ri(t){return Array.from(t.getChildren()).filter(t=>!t.is("uiElement")).length}oi.DEFAULT_PRIORITY=ni;class si extends go{constructor(t,e,n){super(t,e,n),this.getFillerOffset=ai}is(t,e=null){return e?"emptyElement"==t&&e==this.name||super.is(t,e):"emptyElement"==t||super.is(t)}_insertChild(t,e){if(e&&(e instanceof ao||Array.from(e).length>0))throw new T.b("view-emptyelement-cannot-add: Cannot add child nodes to EmptyElement instance.")}}function ai(){return null}const ci=navigator.userAgent.toLowerCase();var li={isMac:function(t){return t.indexOf("macintosh")>-1}(ci),isEdge:function(t){return!!t.match(/edge\/(\d+.?\d*)/)}(ci),isGecko:function(t){return!!t.match(/gecko\/\d+/)}(ci)};const di={"⌘":"ctrl","⇧":"shift","⌥":"alt"},hi={ctrl:"⌘",shift:"⇧",alt:"⌥"},ui=function(){const t={arrowleft:37,arrowup:38,arrowright:39,arrowdown:40,backspace:8,delete:46,enter:13,space:32,esc:27,tab:9,ctrl:1114112,cmd:1114112,shift:2228224,alt:4456448};for(let e=65;e<=90;e++){const n=String.fromCharCode(e);t[n.toLowerCase()]=e}for(let e=48;e<=57;e++)t[e-48]=e;for(let e=112;e<=123;e++)t["f"+(e-111)]=e;return t}();function fi(t){let e;if("string"==typeof t){if(!(e=ui[t.toLowerCase()]))throw new T.b("keyboard-unknown-key: Unknown key name.",{key:t})}else e=t.keyCode+(t.altKey?ui.alt:0)+(t.ctrlKey?ui.ctrl:0)+(t.shiftKey?ui.shift:0);return e}function pi(t){return"string"==typeof t&&(t=gi(t)),t.map(t=>"string"==typeof t?fi(t):t).reduce((t,e)=>e+t,0)}function gi(t){return t.split(/\s*\+\s*/)}class mi extends go{constructor(t,e,n){super(t,e,n),this.getFillerOffset=wi}is(t,e=null){return e?"uiElement"==t&&e==this.name||super.is(t,e):"uiElement"==t||super.is(t)}_insertChild(t,e){if(e&&(e instanceof ao||Array.from(e).length>0))throw new T.b("view-uielement-cannot-add: Cannot add child nodes to UIElement instance.")}render(t){return this.toDomElement(t)}toDomElement(t){const e=t.createElement(this.name);for(const t of this.getAttributeKeys())e.setAttribute(t,this.getAttribute(t));return e}}function bi(t){t.document.on("keydown",(e,n)=>(function(t,e,n){if(e.keyCode==ui.arrowright){const t=e.domTarget.ownerDocument.defaultView.getSelection(),o=1==t.rangeCount&&t.getRangeAt(0).collapsed;if(o||e.shiftKey){const e=t.focusNode,i=t.focusOffset,r=n.domPositionToView(e,i);if(null===r)return;let s=!1;const a=r.getLastMatchingPosition(t=>(t.item.is("uiElement")&&(s=!0),!(!t.item.is("uiElement")&&!t.item.is("attributeElement"))));if(s){const e=n.viewPositionToDom(a);o?t.collapse(e.parent,e.offset):t.extend(e.parent,e.offset)}}}})(0,n,t.domConverter))}function wi(){return null}class _i{constructor(t){this._children=[],t&&this._insertChild(0,t)}[Symbol.iterator](){return this._children[Symbol.iterator]()}get childCount(){return this._children.length}get isEmpty(){return 0===this.childCount}get root(){return this}get parent(){return null}is(t){return"documentFragment"==t}_appendChild(t){return this._insertChild(this.childCount,t)}getChild(t){return this._children[t]}getChildIndex(t){return this._children.indexOf(t)}getChildren(){return this._children[Symbol.iterator]()}_insertChild(t,e){this._fireChange("children",this);let n=0;const o=function(t){if("string"==typeof t)return[new co(t)];uo(t)||(t=[t]);return Array.from(t).map(t=>"string"==typeof t?new co(t):t instanceof lo?new co(t.data):t)}(e);for(const e of o)null!==e.parent&&e._remove(),e.parent=this,this._children.splice(t,0,e),t++,n++;return n}_removeChildren(t,e=1){this._fireChange("children",this);for(let n=t;nn instanceof t))throw new T.b("view-writer-insert-invalid-node");n.is("text")||t(n.getChildren())}})(e=uo(e)?[...e]:[e]);const n=ki(t);if(!n)throw new T.b("view-writer-invalid-position-container");const o=this._breakAttributes(t,!0),i=n._insertChild(o.offset,e);for(const t of e)this._addToClonedElementsGroup(t);const r=o.getShiftedBy(i),s=this.mergeAttributes(o);if(0===i)return new Jo(s,s);{s.isEqual(o)||r.offset--;const t=this.mergeAttributes(r);return new Jo(s,t)}}remove(t){const e=t instanceof Jo?t:Jo._createOn(t);if(Si(e),e.isCollapsed)return new _i;const{start:n,end:o}=this._breakAttributesRange(e,!0),i=n.parent,r=o.offset-n.offset,s=i._removeChildren(n.offset,r);for(const t of s)this._removeFromClonedElementsGroup(t);const a=this.mergeAttributes(n);return e.start=a,e.end=a.clone(),new _i(s)}clear(t,e){Si(t);const n=t.getWalker({direction:"backward",ignoreElementEnd:!0});for(const o of n){const n=o.item;let i;if(n.is("element")&&e.isSimilar(n))i=Jo._createOn(n);else if(!o.nextPosition.isAfter(t.start)&&n.is("textProxy")){const t=n.getAncestors().find(t=>t.is("element")&&e.isSimilar(t));t&&(i=Jo._createIn(t))}i&&(i.end.isAfter(t.end)&&(i.end=t.end),i.start.isBefore(t.start)&&(i.start=t.start),this.remove(i))}}move(t,e){let n;if(e.isAfter(t.end)){const o=(e=this._breakAttributes(e,!0)).parent,i=o.childCount;t=this._breakAttributesRange(t,!0),n=this.remove(t),e.offset+=o.childCount-i}else n=this.remove(t);return this.insert(e,n)}wrap(t,e){if(!(e instanceof oi))throw new T.b("view-writer-wrap-invalid-attribute");if(Si(t),t.isCollapsed){let n=t.start;n.parent.is("element")&&!function(t){return Array.from(t.getChildren()).some(t=>!t.is("uiElement"))}(n.parent)&&(n=n.getLastMatchingPosition(t=>t.item.is("uiElement"))),n=this._wrapPosition(n,e);const o=this.document.selection;return o.isCollapsed&&o.getFirstPosition().isEqual(t.start)&&this.setSelection(n),new Jo(n)}return this._wrapRange(t,e)}unwrap(t,e){if(!(e instanceof oi))throw new T.b("view-writer-unwrap-invalid-attribute");if(Si(t),t.isCollapsed)return t;const{start:n,end:o}=this._breakAttributesRange(t,!0);if(o.isEqual(n.getShiftedBy(1))){const t=n.nodeAfter;if(!e.isSimilar(t)&&t instanceof oi&&this._unwrapAttributeElement(e,t)){const t=this.mergeAttributes(n);t.isEqual(n)||o.offset--;const e=this.mergeAttributes(o);return new Jo(t,e)}}const i=n.parent,r=this._unwrapChildren(i,n.offset,o.offset,e),s=this.mergeAttributes(r.start);s.isEqual(r.start)||r.end.offset--;const a=this.mergeAttributes(r.end);return new Jo(s,a)}rename(t,e){const n=new wo(t,e.getAttributes());return this.insert(Go._createAfter(e),n),this.move(Jo._createIn(e),Go._createAt(n,0)),this.remove(Jo._createOn(e)),n}clearClonedElementsGroup(t){this._cloneGroups.delete(t)}createPositionAt(t,e){return Go._createAt(t,e)}createPositionAfter(t){return Go._createAfter(t)}createPositionBefore(t){return Go._createBefore(t)}createRange(t,e){return new Jo(t,e)}createRangeOn(t){return Jo._createOn(t)}createRangeIn(t){return Jo._createIn(t)}createSelection(t,e,n){return new Yo(t,e,n)}_wrapChildren(t,e,n,o){let i=e;const r=[];for(;i!1),t.parent._insertChild(t.offset,n);const o=new Jo(t,t.getShiftedBy(1));this.wrap(o,e);const i=new Go(n.parent,n.index);n._remove();const r=i.nodeBefore,s=i.nodeAfter;return r instanceof co&&s instanceof co?Ci(r,s):xi(i)}_wrapAttributeElement(t,e){if(!Ei(t,e))return!1;if(t.name!==e.name||t.priority!==e.priority)return!1;for(const n of t.getAttributeKeys())if("class"!==n&&"style"!==n&&e.hasAttribute(n)&&e.getAttribute(n)!==t.getAttribute(n))return!1;for(const n of t.getStyleNames())if(e.hasStyle(n)&&e.getStyle(n)!==t.getStyle(n))return!1;for(const n of t.getAttributeKeys())"class"!==n&&"style"!==n&&(e.hasAttribute(n)||this.setAttribute(n,t.getAttribute(n),e));for(const n of t.getStyleNames())e.hasStyle(n)||this.setStyle(n,t.getStyle(n),e);for(const n of t.getClassNames())e.hasClass(n)||this.addClass(n,e);return!0}_unwrapAttributeElement(t,e){if(!Ei(t,e))return!1;if(t.name!==e.name||t.priority!==e.priority)return!1;for(const n of t.getAttributeKeys())if("class"!==n&&"style"!==n&&(!e.hasAttribute(n)||e.getAttribute(n)!==t.getAttribute(n)))return!1;if(!e.hasClass(...t.getClassNames()))return!1;for(const n of t.getStyleNames())if(!e.hasStyle(n)||e.getStyle(n)!==t.getStyle(n))return!1;for(const n of t.getAttributeKeys())"class"!==n&&"style"!==n&&this.removeAttribute(n,e);return this.removeClass(Array.from(t.getClassNames()),e),this.removeStyle(Array.from(t.getStyleNames()),e),!0}_breakAttributesRange(t,e=!1){const n=t.start,o=t.end;if(Si(t),t.isCollapsed){const n=this._breakAttributes(t.start,e);return new Jo(n,n)}const i=this._breakAttributes(o,e),r=i.parent.childCount,s=this._breakAttributes(n,e);return i.offset+=i.parent.childCount-r,new Jo(s,i)}_breakAttributes(t,e=!1){const n=t.offset,o=t.parent;if(t.parent.is("emptyElement"))throw new T.b("view-writer-cannot-break-empty-element");if(t.parent.is("uiElement"))throw new T.b("view-writer-cannot-break-ui-element");if(!e&&o.is("text")&&Ti(o.parent))return t.clone();if(Ti(o))return t.clone();if(o.is("text"))return this._breakAttributes(Ai(t),e);if(n==o.childCount){const t=new Go(o.parent,o.index+1);return this._breakAttributes(t,e)}if(0===n){const t=new Go(o.parent,o.index);return this._breakAttributes(t,e)}{const t=o.index+1,i=o._clone();o.parent._insertChild(t,i),this._addToClonedElementsGroup(i);const r=o.childCount-n,s=o._removeChildren(n,r);i._appendChild(s);const a=new Go(o.parent,t);return this._breakAttributes(a,e)}}_addToClonedElementsGroup(t){if(!t.root.is("rootElement"))return;if(t.is("element"))for(const e of t.getChildren())this._addToClonedElementsGroup(e);const e=t.id;if(!e)return;let n=this._cloneGroups.get(e);n||(n=new Set,this._cloneGroups.set(e,n)),n.add(t),t._clonesGroup=n}_removeFromClonedElementsGroup(t){if(t.is("element"))for(const e of t.getChildren())this._removeFromClonedElementsGroup(e);const e=t.id;if(!e)return;const n=this._cloneGroups.get(e);n&&n.delete(t)}}function ki(t){let e=t.parent;for(;!Ti(e);){if(!e)return;e=e.parent}return e}function yi(t,e){return t.prioritye.priority)&&t.getIdentity(){const e=t.createElement("br");return e.dataset.ckeFiller=!0,e},Ii=t=>t.createTextNode(" "),Vi=7;let Mi="";for(let t=0;th?-1:1;c[a+u]&&(c[a]=c[a+u].slice(0)),c[a]||(c[a]=[]),c[a].push(d>h?o:i);let f=Math.max(d,h),p=f-a;for(;pa;h--)l[h]=d(h);l[a]=d(a),u++}while(l[a]!==s);return c[a].slice(1)}function qi(t,e,n){t.insertBefore(n,t.childNodes[e]||null)}function Hi(t){const e=t.parentNode;e&&e.removeChild(t)}function Ui(t){if(t){if(t.defaultView)return t instanceof t.defaultView.Document;if(t.ownerDocument&&t.ownerDocument.defaultView)return t instanceof t.ownerDocument.defaultView.Node}return!1}function Wi(t,e){if(t===e)return[];return function(t,e){const n=[],{firstIndex:o,lastIndexOld:i,lastIndexNew:r}=e;r-o>0&&n.push({index:o,type:"insert",values:t.substring(o,r).split("")});i-o>0&&n.push({index:o+(r-o),type:"delete",howMany:i-o});return n}(e,function(t,e){const n=$i(t,e),o=Ki(t,n),i=Ki(e,n),r=$i(o,i),s=t.length-r,a=e.length-r;return{firstIndex:n,lastIndexOld:s,lastIndexNew:a}}(t,e))}function $i(t,e){for(let n=0;nt.hasAttribute("contenteditable"));return!e||"true"==e.getAttribute("contenteditable")}(e))return!1;if(n===e.getFillerOffset())return!1;const o=t.nodeBefore,i=t.nodeAfter;return!(o instanceof co||i instanceof co)}_updateText(t,e){const n=this.domConverter.findCorrespondingDomText(t),o=this.domConverter.viewToDom(t,n.ownerDocument),i=n.data;let r=o.data;const s=e.inlineFillerPosition;if(s&&s.parent==t.parent&&s.offset==t.index&&(r=Mi+r),i!=r){const t=Wi(i,r);for(const e of t)"insert"===e.type?n.insertData(e.index,e.values.join("")):n.deleteData(e.index,e.howMany)}}_updateAttrs(t){const e=this.domConverter.mapViewToDom(t);if(!e)return;const n=Array.from(e.attributes).map(t=>t.name),o=t.getAttributeKeys();for(const n of o)e.setAttribute(n,t.getAttribute(n));for(const o of n)t.hasAttribute(o)||e.removeAttribute(o)}_updateChildren(t,e){const n=this.domConverter.mapViewToDom(t);if(!n)return;const o=e.inlineFillerPosition,i=this.domConverter.mapViewToDom(t).childNodes,r=Array.from(this.domConverter.viewChildrenToDom(t,n.ownerDocument,{bind:!0,inlineFillerPosition:o}));o&&o.parent===t&&Ji(n.ownerDocument,r,o.offset);const s=this._diffNodeLists(i,r);let a=0;const c=new Set;for(const t of s)"insert"===t?(qi(n,a,r[a]),a++):"delete"===t?(c.add(i[a]),Hi(i[a])):(this._markDescendantTextToSync(this.domConverter.domToView(r[a])),a++);for(const t of c)t.parentNode||this.domConverter.unbindDomElement(t)}_diffNodeLists(t,e){return ji(t,e,function(t,e,n){if(e===n)return!0;if(Ri(e)&&Ri(n))return e.data===n.data;if(Li(e,t)&&Li(n,t))return!0;return!1}.bind(null,this.domConverter.blockFiller))}_findReplaceActions(t,e,n){if(-1===t.indexOf("insert")||-1===t.indexOf("delete"))return t;let o=[],i=[],r=[];const s={equal:0,insert:0,delete:0};for(const a of t)"insert"===a?r.push(n[s.equal+s.insert]):"delete"===a?i.push(e[s.equal+s.delete]):((o=o.concat(ji(i,r,Qi).map(t=>"equal"===t?"replace":t))).push("equal"),i=[],r=[]),s[a]++;return o.concat(ji(i,r,Qi).map(t=>"equal"===t?"replace":t))}_markDescendantTextToSync(t){if(t)if(t.is("text"))this.markedTexts.add(t);else if(t.is("element"))for(const e of t.getChildren())this._markDescendantTextToSync(e)}_updateSelection(){if(0===this.selection.rangeCount)return this._removeDomSelection(),void this._removeFakeSelection();const t=this.domConverter.mapViewToDom(this.selection.editableElement);this.isFocused&&t&&(this.selection.isFake?this._updateFakeSelection(t):(this._removeFakeSelection(),this._updateDomSelection(t)))}_updateFakeSelection(t){const e=t.ownerDocument;let n=this._fakeSelectionContainer;n||(this._fakeSelectionContainer=n=e.createElement("div"),Object.assign(n.style,{position:"fixed",top:0,left:"-9999px",width:"42px"}),n.appendChild(e.createTextNode(" "))),n.parentElement||t.appendChild(n),n.firstChild.data=this.selection.fakeSelectionLabel||" ";const o=e.getSelection(),i=e.createRange();o.removeAllRanges(),i.selectNodeContents(n),o.addRange(i),this.domConverter.bindFakeSelection(n,this.selection)}_updateDomSelection(t){const e=t.ownerDocument.defaultView.getSelection();if(!this._domSelectionNeedsUpdate(e))return;const n=this.domConverter.viewPositionToDom(this.selection.anchor),o=this.domConverter.viewPositionToDom(this.selection.focus);t.focus(),e.collapse(n.parent,n.offset),e.extend(o.parent,o.offset),li.isGecko&&function(t,e){const n=t.parent;if(n.nodeType!=Node.ELEMENT_NODE||t.offset!=n.childNodes.length-1)return;const o=n.childNodes[t.offset];o&&"BR"==o.tagName&&e.addRange(e.getRangeAt(0))}(o,e)}_domSelectionNeedsUpdate(t){if(!this.domConverter.isDomSelectionCorrect(t))return!0;const e=t&&this.domConverter.domSelectionToView(t);return(!e||!this.selection.isEqual(e))&&!(!this.selection.isCollapsed&&this.selection.isSimilar(e))}_removeDomSelection(){for(const t of this.domDocuments){if(t.getSelection().rangeCount){const e=t.activeElement,n=this.domConverter.mapDomToView(e);e&&n&&t.getSelection().removeAllRanges()}}}_removeFakeSelection(){const t=this._fakeSelectionContainer;t&&t.remove()}_updateFocus(){if(this.isFocused){const t=this.selection.editableElement;t&&this.domConverter.focus(t)}}}function Ji(t,e,n){const o=e instanceof Array?e:e.childNodes,i=o[n];if(Ri(i))return i.data=Mi+i.data,i;{const i=t.createTextNode(Mi);return Array.isArray(e)?o.splice(n,0,i):qi(e,n,i),i}}function Qi(t,e){return Ui(t)&&Ui(e)&&!Ri(t)&&!Ri(e)&&t.tagName.toLowerCase()===e.tagName.toLowerCase()}j(Gi,Fo);var Xi={window:window,document:document};function Yi(t){let e=0;for(;t.previousSibling;)t=t.previousSibling,e++;return e}function Zi(t){const e=[];for(;t&&t.nodeType!=Node.DOCUMENT_NODE;)e.unshift(t),t=t.parentNode;return e}var tr=function(t){return w(t)&&1===t.nodeType&&!C(t)};class er{constructor(t={}){this.blockFiller=t.blockFiller||Oi,this.preElements=["pre"],this.blockElements=["p","div","h1","h2","h3","h4","h5","h6"],this._domToViewMapping=new WeakMap,this._viewToDomMapping=new WeakMap,this._fakeSelectionMapping=new WeakMap}bindFakeSelection(t,e){this._fakeSelectionMapping.set(t,new Yo(e))}fakeSelectionToView(t){return this._fakeSelectionMapping.get(t)}bindElements(t,e){this._domToViewMapping.set(t,e),this._viewToDomMapping.set(e,t)}unbindDomElement(t){const e=this._domToViewMapping.get(t);if(e){this._domToViewMapping.delete(t),this._viewToDomMapping.delete(e);for(const e of Array.from(t.childNodes))this.unbindDomElement(e)}}bindDocumentFragments(t,e){this._domToViewMapping.set(t,e),this._viewToDomMapping.set(e,t)}viewToDom(t,e,n={}){if(t.is("text")){const n=this._processDataFromViewText(t);return e.createTextNode(n)}{if(this.mapViewToDom(t))return this.mapViewToDom(t);let o;if(t.is("documentFragment"))o=e.createDocumentFragment(),n.bind&&this.bindDocumentFragments(o,t);else{if(t.is("uiElement"))return o=t.render(e),n.bind&&this.bindElements(o,t),o;o=e.createElement(t.name),n.bind&&this.bindElements(o,t);for(const e of t.getAttributeKeys())o.setAttribute(e,t.getAttribute(e))}if(n.withChildren||void 0===n.withChildren)for(const i of this.viewChildrenToDom(t,e,n))o.appendChild(i);return o}}*viewChildrenToDom(t,e,n={}){const o=t.getFillerOffset&&t.getFillerOffset();let i=0;for(const r of t.getChildren())o===i&&(yield this.blockFiller(e)),yield this.viewToDom(r,e,n),i++;o===i&&(yield this.blockFiller(e))}viewRangeToDom(t){const e=this.viewPositionToDom(t.start),n=this.viewPositionToDom(t.end),o=document.createRange();return o.setStart(e.parent,e.offset),o.setEnd(n.parent,n.offset),o}viewPositionToDom(t){const e=t.parent;if(e.is("text")){const n=this.findCorrespondingDomText(e);if(!n)return null;let o=t.offset;return Ni(n)&&(o+=Vi),{parent:n,offset:o}}{let n,o,i;if(0===t.offset){if(!(n=this.mapViewToDom(e)))return null;i=n.childNodes[0]}else{const e=t.nodeBefore;if(!(o=e.is("text")?this.findCorrespondingDomText(e):this.mapViewToDom(t.nodeBefore)))return null;n=o.parentNode,i=o.nextSibling}if(Ri(i)&&Ni(i))return{parent:i,offset:Vi};return{parent:n,offset:o?Yi(o)+1:0}}}domToView(t,e={}){if(Li(t,this.blockFiller))return null;const n=this.getParentUIElement(t,this._domToViewMapping);if(n)return n;if(Ri(t)){if(Bi(t))return null;{const e=this._processDataFromDomText(t);return""===e?null:new co(e)}}if(this.isComment(t))return null;{if(this.mapDomToView(t))return this.mapDomToView(t);let n;if(this.isDocumentFragment(t))n=new _i,e.bind&&this.bindDocumentFragments(t,n);else{const o=e.keepOriginalCase?t.tagName:t.tagName.toLowerCase();n=new go(o),e.bind&&this.bindElements(t,n);const i=t.attributes;for(let t=i.length-1;t>=0;t--)n._setAttribute(i[t].name,i[t].value)}if(e.withChildren||void 0===e.withChildren)for(const o of this.domChildrenToView(t,e))n._appendChild(o);return n}}*domChildrenToView(t,e={}){for(let n=0;n{const{scrollLeft:e,scrollTop:n}=t;o.push([e,n])}),e.focus(),or(e,t=>{const[e,n]=o.shift();t.scrollLeft=e,t.scrollTop=n}),Xi.window.scrollTo(t,n)}}isElement(t){return t&&t.nodeType==Node.ELEMENT_NODE}isDocumentFragment(t){return t&&t.nodeType==Node.DOCUMENT_FRAGMENT_NODE}isComment(t){return t&&t.nodeType==Node.COMMENT_NODE}isDomSelectionBackward(t){if(t.isCollapsed)return!1;const e=document.createRange();e.setStart(t.anchorNode,t.anchorOffset),e.setEnd(t.focusNode,t.focusOffset);const n=e.collapsed;return e.detach(),n}getParentUIElement(t){const e=Zi(t);for(e.pop();e.length;){const t=e.pop(),n=this._domToViewMapping.get(t);if(n&&n.is("uiElement"))return n}return null}isDomSelectionCorrect(t){return this._isDomSelectionPositionCorrect(t.anchorNode,t.anchorOffset)&&this._isDomSelectionPositionCorrect(t.focusNode,t.focusOffset)}_isDomSelectionPositionCorrect(t,e){if(Ri(t)&&Ni(t)&&ethis.preElements.includes(t.name)))return e;if(" "==e.charAt(0)){const n=this._getTouchingViewTextNode(t,!1);!(n&&this._nodeEndsWithSpace(n))&&n||(e=" "+e.substr(1))}if(" "==e.charAt(e.length-1)){this._getTouchingViewTextNode(t,!0)||(e=e.substr(0,e.length-1)+" ")}return e.replace(/ {2}/g,"  ")}_nodeEndsWithSpace(t){if(t.getAncestors().some(t=>this.preElements.includes(t.name)))return!1;const e=this._processDataFromViewText(t);return" "==e.charAt(e.length-1)}_processDataFromDomText(t){let e=t.data;if(nr(t,this.preElements))return Fi(t);e=e.replace(/[ \n\t\r]{1,}/g," ");const n=this._getTouchingInlineDomNode(t,!1),o=this._getTouchingInlineDomNode(t,!0),i=this._checkShouldLeftTrimDomText(n),r=this._checkShouldRightTrimDomText(t,o);return i&&(e=e.replace(/^ /,"")),r&&(e=e.replace(/ $/,"")),e=(e=Fi(new Text(e))).replace(/ \u00A0/g," "),i&&(e=e.replace(/^\u00A0/," ")),Ri(o)&&" "!=o.data.charAt(0)||(e=e.replace(/\u00A0( *)$/," $1")),e}_checkShouldLeftTrimDomText(t){return!t||(!!tr(t)||/[^\S\u00A0]/.test(t.data.charAt(t.data.length-1)))}_checkShouldRightTrimDomText(t,e){return!e&&!Ni(t)}_getTouchingViewTextNode(t,e){const n=new Ko({startPosition:e?Go._createAfter(t):Go._createBefore(t),direction:e?"forward":"backward"});for(const t of n){if(t.item.is("containerElement"))return null;if(t.item.is("br"))return null;if(t.item.is("textProxy"))return t.item}return null}_getTouchingInlineDomNode(t,e){if(!t.parentNode)return null;const n=e?"nextNode":"previousNode",o=t.ownerDocument,i=Zi(t)[0],r=o.createTreeWalker(i,NodeFilter.SHOW_TEXT|NodeFilter.SHOW_ELEMENT,{acceptNode:t=>Ri(t)?NodeFilter.FILTER_ACCEPT:"BR"==t.tagName?NodeFilter.FILTER_ACCEPT:NodeFilter.FILTER_SKIP});r.currentNode=t;const s=r[n]();if(null!==s){const e=function(t,e){const n=Zi(t),o=Zi(e);let i=0;for(;n[i]==o[i]&&n[i];)i++;return 0===i?null:n[i-1]}(t,s);if(e&&!nr(t,this.blockElements,e)&&!nr(s,this.blockElements,e))return s}return null}}function nr(t,e,n){let o=Zi(t);return n&&(o=o.slice(o.indexOf(n)+1)),o.some(t=>t.tagName&&e.includes(t.tagName.toLowerCase()))}function or(t,e){for(;t&&t!=Xi.document;)e(t),t=t.parentNode}function ir(t){const e=Object.prototype.toString.apply(t);return"[object Window]"==e||"[object global]"==e}var rr=Io({},M,{listenTo(t,...e){if(Ui(t)||ir(t)){const n=this._getProxyEmitter(t)||new sr(t);n.attach(...e),t=n}M.listenTo.call(this,t,...e)},stopListening(t,e,n){if(Ui(t)||ir(t)){const e=this._getProxyEmitter(t);if(!e)return;t=e}M.stopListening.call(this,t,e,n),t instanceof sr&&t.detach(e)},_getProxyEmitter(t){return function(t,e){return t[I]&&t[I][e]?t[I][e].emitter:null}(this,ar(t))}});class sr{constructor(t){N(this,ar(t)),this._domNode=t}}function ar(t){return t["data-ck-expando"]||(t["data-ck-expando"]=R())}Io(sr.prototype,M,{attach(t,e,n={}){if(this._domListeners&&this._domListeners[t])return;const o=this._createDomListener(t,!!n.useCapture);this._domNode.addEventListener(t,o,!!n.useCapture),this._domListeners||(this._domListeners={}),this._domListeners[t]=o},detach(t){let e;!this._domListeners[t]||(e=this._events[t])&&e.callbacks.length||this._domListeners[t].removeListener()},_createDomListener(t,e){const n=e=>{this.fire(t,e)};return n.removeListener=(()=>{this._domNode.removeEventListener(t,n,e),delete this._domListeners[t]}),n}});class cr{constructor(t){this.view=t,this.document=t.document,this.isEnabled=!1}enable(){this.isEnabled=!0}disable(){this.isEnabled=!1}destroy(){this.disable(),this.stopListening()}}j(cr,rr);var lr="__lodash_hash_undefined__";var dr=function(t){return this.__data__.set(t,lr),this};var hr=function(t){return this.__data__.has(t)};function ur(t){var e=-1,n=null==t?0:t.length;for(this.__data__=new Ut;++ea))return!1;var l=r.get(t);if(l&&r.get(e))return l==e;var d=-1,h=!0,u=n&br?new fr:void 0;for(r.set(t,e),r.set(e,t);++d{this.listenTo(t,e,(t,e)=>{this.isEnabled&&this.onDomEvent(e)},{useCapture:this.useCapture})})}fire(t,e,n){this.isEnabled&&this.document.fire(t,new Jr(this.view,e,n))}}class Xr extends Qr{constructor(t){super(t),this.domEventType=["keydown","keyup"]}onDomEvent(t){this.fire(t.type,t,{keyCode:t.keyCode,altKey:t.altKey,ctrlKey:t.ctrlKey||t.metaKey,shiftKey:t.shiftKey,get keystroke(){return fi(this)}})}}var Yr=function(){return o.a.Date.now()},Zr="[object Symbol]";var ts=function(t){return"symbol"==typeof t||w(t)&&g(t)==Zr},es=NaN,ns=/^\s+|\s+$/g,os=/^[-+]0x[0-9a-f]+$/i,is=/^0b[01]+$/i,rs=/^0o[0-7]+$/i,ss=parseInt;var as=function(t){if("number"==typeof t)return t;if(ts(t))return es;if(ot(t)){var e="function"==typeof t.valueOf?t.valueOf():t;t=ot(e)?e+"":e}if("string"!=typeof t)return 0===t?t:+t;t=t.replace(ns,"");var n=is.test(t);return n||rs.test(t)?ss(t.slice(2),n?2:8):os.test(t)?es:+t},cs="Expected a function",ls=Math.max,ds=Math.min;var hs=function(t,e,n){var o,i,r,s,a,c,l=0,d=!1,h=!1,u=!0;if("function"!=typeof t)throw new TypeError(cs);function f(e){var n=o,r=i;return o=i=void 0,l=e,s=t.apply(r,n)}function p(t){var n=t-c;return void 0===c||n>=e||n<0||h&&t-l>=r}function g(){var t=Yr();if(p(t))return m(t);a=setTimeout(g,function(t){var n=e-(t-c);return h?ds(n,r-(t-l)):n}(t))}function m(t){return a=void 0,u&&o?f(t):(o=i=void 0,s)}function b(){var t=Yr(),n=p(t);if(o=arguments,i=this,c=t,n){if(void 0===a)return function(t){return l=t,a=setTimeout(g,e),d?f(t):s}(c);if(h)return a=setTimeout(g,e),f(c)}return void 0===a&&(a=setTimeout(g,e)),s}return e=as(e)||0,ot(n)&&(d=!!n.leading,r=(h="maxWait"in n)?ls(as(n.maxWait)||0,e):r,u="trailing"in n?!!n.trailing:u),b.cancel=function(){void 0!==a&&clearTimeout(a),l=0,o=c=i=a=void 0},b.flush=function(){return void 0===a?s:m(Yr())},b};class us extends cr{constructor(t){super(t),this._fireSelectionChangeDoneDebounced=hs(t=>this.document.fire("selectionChangeDone",t),200)}observe(){const t=this.document;t.on("keydown",(e,n)=>{t.selection.isFake&&function(t){return t==ui.arrowright||t==ui.arrowleft||t==ui.arrowup||t==ui.arrowdown}(n.keyCode)&&this.isEnabled&&(n.preventDefault(),this._handleSelectionMove(n.keyCode))},{priority:"lowest"})}destroy(){super.destroy(),this._fireSelectionChangeDoneDebounced.cancel()}_handleSelectionMove(t){const e=this.document.selection,n=new Yo(e.getRanges(),{backward:e.isBackward,fake:!1});t!=ui.arrowleft&&t!=ui.arrowup||n.setTo(n.getFirstPosition()),t!=ui.arrowright&&t!=ui.arrowdown||n.setTo(n.getLastPosition());const o={oldSelection:e,newSelection:n,domSelection:null};this.document.fire("selectionChange",o),this._fireSelectionChangeDoneDebounced(o)}}var fs=n(1);class ps extends cr{constructor(t){super(t),this.mutationObserver=t.getObserver(Gr),this.selection=this.document.selection,this.domConverter=t.domConverter,this._documents=new WeakSet,this._fireSelectionChangeDoneDebounced=hs(t=>this.document.fire("selectionChangeDone",t),200),this._clearInfiniteLoopInterval=setInterval(()=>this._clearInfiniteLoop(),1e3),this._loopbackCounter=0}observe(t){const e=t.ownerDocument;this._documents.has(e)||(this.listenTo(e,"selectionchange",()=>{this._handleSelectionChange(e)}),this._documents.add(e))}destroy(){super.destroy(),clearInterval(this._clearInfiniteLoopInterval),this._fireSelectionChangeDoneDebounced.cancel()}_handleSelectionChange(t){if(!this.isEnabled||!this.document.isFocused&&!this.document.isReadOnly)return;this.mutationObserver.flush();const e=t.defaultView.getSelection(),n=this.domConverter.domSelectionToView(e);if(!this.selection.isEqual(n)||!this.domConverter.isDomSelectionCorrect(e))if(++this._loopbackCounter>60)fs.a.warn("selectionchange-infinite-loop: Selection change observer detected an infinite rendering loop.");else if(this.selection.isSimilar(n))this.view.render();else{const t={oldSelection:this.selection,newSelection:n,domSelection:e};this.document.fire("selectionChange",t),this._fireSelectionChangeDoneDebounced(t)}}_clearInfiniteLoop(){this._loopbackCounter=0}}class gs extends Qr{constructor(t){super(t),this.domEventType=["focus","blur"],this.useCapture=!0;const e=this.document;e.on("focus",()=>{e.isFocused=!0,this._renderTimeoutId=setTimeout(()=>t.render(),50)}),e.on("blur",(n,o)=>{const i=e.selection.editableElement;null!==i&&i!==o.target||(e.isFocused=!1,t.render())})}onDomEvent(t){this.fire(t.type,t)}destroy(){this._renderTimeoutId&&clearTimeout(this._renderTimeoutId),super.destroy()}}class ms extends Qr{constructor(t){super(t),this.domEventType=["compositionstart","compositionupdate","compositionend"];const e=this.document;e.on("compositionstart",()=>{e.isComposing=!0}),e.on("compositionend",()=>{e.isComposing=!1})}onDomEvent(t){this.fire(t.type,t)}}function bs(t){return"[object Range]"==Object.prototype.toString.apply(t)}function ws(t){const e=t.ownerDocument.defaultView.getComputedStyle(t);return{top:parseInt(e.borderTopWidth,10),right:parseInt(e.borderRightWidth,10),bottom:parseInt(e.borderBottomWidth,10),left:parseInt(e.borderLeftWidth,10)}}const _s=["top","right","bottom","left","width","height"];class vs{constructor(t){const e=bs(t);if(Object.defineProperty(this,"_source",{value:t._source||t,writable:!0,enumerable:!1}),tr(t)||e){const n=e?t.startContainer:t;n.ownerDocument&&n.ownerDocument.body.contains(n)||fs.a.warn("rect-source-not-in-dom: The source of this rect does not belong to any rendered DOM tree.",{source:t}),ks(this,e?vs.getDomRangeRects(t)[0]:t.getBoundingClientRect())}else if(ir(t)){const{innerWidth:e,innerHeight:n}=t;ks(this,{top:0,right:e,bottom:n,left:0,width:e,height:n})}else ks(this,t)}clone(){return new vs(this)}moveTo(t,e){return this.top=e,this.right=t+this.width,this.bottom=e+this.height,this.left=t,this}moveBy(t,e){return this.top+=e,this.right+=t,this.left+=t,this.bottom+=e,this}getIntersection(t){const e={top:Math.max(this.top,t.top),right:Math.min(this.right,t.right),bottom:Math.min(this.bottom,t.bottom),left:Math.max(this.left,t.left)};return e.width=e.right-e.left,e.height=e.bottom-e.top,e.width<0||e.height<0?null:new vs(e)}getIntersectionArea(t){const e=this.getIntersection(t);return e?e.getArea():0}getArea(){return this.width*this.height}getVisible(){const t=this._source;let e=this.clone();if(!ys(t)){let n=t.parentNode||t.commonAncestorContainer;for(;n&&!ys(n);){const t=new vs(n),o=e.getIntersection(t);if(!o)return null;o.getArea()Is(t,o));const s=Is(t,o);if(As(o,s,e),o.parent!=o){if(i=o.frameElement,o=o.parent,!i)return}else o=null}}function As(t,e,n){const o=e.clone().moveBy(0,n),i=e.clone().moveBy(0,-n),r=new vs(t).excludeScrollbarsAndBorders();if(![i,o].every(t=>r.contains(t))){let{scrollX:s,scrollY:a}=t;Ts(i,r)?a-=r.top-e.top+n:Ps(o,r)&&(a+=e.bottom-r.bottom+n),Ss(e,r)?s-=r.left-e.left+n:Es(e,r)&&(s+=e.right-r.right+n),t.scrollTo(s,a)}}function Cs(t,e){const n=Rs(t);let o,i;for(;t!=n.document.body;)i=e(),(o=new vs(t).excludeScrollbarsAndBorders()).contains(i)||(Ts(i,o)?t.scrollTop-=o.top-i.top:Ps(i,o)&&(t.scrollTop+=i.bottom-o.bottom),Ss(i,o)?t.scrollLeft-=o.left-i.left:Es(i,o)&&(t.scrollLeft+=i.right-o.right)),t=t.parentNode}function Ps(t,e){return t.bottom>e.bottom}function Ts(t,e){return t.tope.right}function Rs(t){return bs(t)?t.startContainer.ownerDocument.defaultView:t.ownerDocument.defaultView}function Os(t){if(bs(t)){let e=t.commonAncestorContainer;return Ri(e)&&(e=e.parentNode),e}return t.parentNode}function Is(t,e){const n=Rs(t),o=new vs(t);if(n===e)return o;{let t=n;for(;t!=e;){const e=t.frameElement,n=new vs(e).excludeScrollbarsAndBorders();o.moveBy(n.left,n.top),t=t.parent}}return o}Object.assign({},{scrollViewportToShowTarget:xs,scrollAncestorsToShowTarget:function(t){Cs(Os(t),()=>new vs(t))}});class Vs{constructor(){this.document=new ei,this.domConverter=new er,this._renderer=new Gi(this.domConverter,this.document.selection),this._renderer.bind("isFocused").to(this.document),this.domRoots=new Map,this._observers=new Map,this._ongoingChange=!1,this._renderingInProgress=!1,this._postFixersInProgress=!1,this._renderingDisabled=!1,this._writer=new vi(this.document),this.addObserver(Gr),this.addObserver(ps),this.addObserver(gs),this.addObserver(Xr),this.addObserver(us),this.addObserver(ms),function(t){t.document.on("keydown",zi)}(this),bi(this),this.on("render",()=>{this._render(),this.document.fire("layoutChanged")})}attachDomRoot(t,e="main"){const n=this.document.getRoot(e);n._name=t.tagName.toLowerCase(),this.domRoots.set(e,t),this.domConverter.bindElements(t,n),this._renderer.markToSync("children",n),this._renderer.domDocuments.add(t.ownerDocument),n.on("change:children",(t,e)=>this._renderer.markToSync("children",e)),n.on("change:attributes",(t,e)=>this._renderer.markToSync("attributes",e)),n.on("change:text",(t,e)=>this._renderer.markToSync("text",e));for(const n of this._observers.values())n.observe(t,e)}getDomRoot(t="main"){return this.domRoots.get(t)}addObserver(t){let e=this._observers.get(t);if(e)return e;e=new t(this),this._observers.set(t,e);for(const[t,n]of this.domRoots)e.observe(n,t);return e.enable(),e}getObserver(t){return this._observers.get(t)}disableObservers(){for(const t of this._observers.values())t.disable()}enableObservers(){for(const t of this._observers.values())t.enable()}scrollToTheSelection(){const t=this.document.selection.getFirstRange();t&&xs({target:this.domConverter.viewRangeToDom(t),viewportOffset:20})}focus(){if(!this.document.isFocused){const t=this.document.selection.editableElement;t?(this.domConverter.focus(t),this.render()):fs.a.warn("view-focus-no-selection: There is no selection in any editable to focus.")}}change(t){if(this._renderingInProgress||this._postFixersInProgress)throw new T.b("cannot-change-view-tree: Attempting to make changes to the view when it is in an incorrect state: rendering or post-fixers are in progress. This may cause some unexpected behavior and inconsistency between the DOM and the view.");if(this._ongoingChange)return t(this._writer);this._ongoingChange=!0;const e=t(this._writer);return this._ongoingChange=!1,this._renderingDisabled||(this._postFixersInProgress=!0,this.document._callPostFixers(this._writer),this._postFixersInProgress=!1,this.fire("render")),e}render(){this.change(()=>{})}destroy(){for(const t of this._observers.values())t.destroy();this.stopListening()}createPositionAt(t,e){return Go._createAt(t,e)}createPositionAfter(t){return Go._createAfter(t)}createPositionBefore(t){return Go._createBefore(t)}createRange(t,e){return new Jo(t,e)}createRangeOn(t){return Jo._createOn(t)}createRangeIn(t){return Jo._createIn(t)}createSelection(t,e,n){return new Yo(t,e,n)}_render(){this._renderingInProgress=!0,this.disableObservers(),this._renderer.render(),this.enableObservers(),this._renderingInProgress=!1}}function Ms(t){return C(t)?ho(t):new Map(t)}j(Vs,Fo);class Ns{constructor(t){this.parent=null,this._attrs=Ms(t)}get index(){let t;if(!this.parent)return null;if(null===(t=this.parent.getChildIndex(this)))throw new T.b("model-node-not-found-in-parent: The node's parent does not contain this node.");return t}get startOffset(){let t;if(!this.parent)return null;if(null===(t=this.parent.getChildStartOffset(this)))throw new T.b("model-node-not-found-in-parent: The node's parent does not contain this node.");return t}get offsetSize(){return 1}get endOffset(){return this.parent?this.startOffset+this.offsetSize:null}get nextSibling(){const t=this.index;return null!==t&&this.parent.getChild(t+1)||null}get previousSibling(){const t=this.index;return null!==t&&this.parent.getChild(t-1)||null}get root(){let t=this;for(;t.parent;)t=t.parent;return t}get document(){return this.root==this?null:this.root.document||null}getPath(){const t=[];let e=this;for(;e.parent;)t.unshift(e.startOffset),e=e.parent;return t}getAncestors(t={includeSelf:!1,parentFirst:!1}){const e=[];let n=t.includeSelf?this:this.parent;for(;n;)e[t.parentFirst?"push":"unshift"](n),n=n.parent;return e}getCommonAncestor(t,e={}){const n=this.getAncestors(e),o=t.getAncestors(e);let i=0;for(;n[i]==o[i]&&n[i];)i++;return 0===i?null:n[i-1]}isBefore(t){if(this==t)return!1;if(this.root!==t.root)return!1;const e=this.getPath(),n=t.getPath(),o=q(e,n);switch(o){case"prefix":return!0;case"extension":return!1;default:return e[o](t[e[0]]=e[1],t),{})),t}_clone(){return new Ns(this._attrs)}_remove(){this.parent._removeChildren(this.index)}_setAttribute(t,e){this._attrs.set(t,e)}_setAttributesTo(t){this._attrs=Ms(t)}_removeAttribute(t){return this._attrs.delete(t)}_clearAttributes(){this._attrs.clear()}is(t){return"node"==t}}class Bs extends Ns{constructor(t,e){super(e),this._data=t||""}get offsetSize(){return this.data.length}get data(){return this._data}is(t){return"text"==t||super.is(t)}toJSON(){const t=super.toJSON();return t.data=this.data,t}_clone(){return new Bs(this.data,this.getAttributes())}static fromJSON(t){return new Bs(t.data,t.attributes)}}class Fs{constructor(t,e,n){if(this.textNode=t,e<0||e>t.offsetSize)throw new T.b("model-textproxy-wrong-offsetintext: Given offsetInText value is incorrect.");if(n<0||e+n>t.offsetSize)throw new T.b("model-textproxy-wrong-length: Given length value is incorrect.");this.data=t.data.substring(e,e+n),this.offsetInText=e}get startOffset(){return null!==this.textNode.startOffset?this.textNode.startOffset+this.offsetInText:null}get offsetSize(){return this.data.length}get endOffset(){return null!==this.startOffset?this.startOffset+this.offsetSize:null}get isPartial(){return this.offsetSize!==this.textNode.offsetSize}get parent(){return this.textNode.parent}get root(){return this.textNode.root}get document(){return this.textNode.document}is(t){return"textProxy"==t}getPath(){const t=this.textNode.getPath();return t.length>0&&(t[t.length-1]+=this.offsetInText),t}getAncestors(t={includeSelf:!1,parentFirst:!1}){const e=[];let n=t.includeSelf?this:this.parent;for(;n;)e[t.parentFirst?"push":"unshift"](n),n=n.parent;return e}hasAttribute(t){return this.textNode.hasAttribute(t)}getAttribute(t){return this.textNode.getAttribute(t)}getAttributes(){return this.textNode.getAttributes()}getAttributeKeys(){return this.textNode.getAttributeKeys()}}class Ds{constructor(t){this._nodes=[],t&&this._insertNodes(0,t)}[Symbol.iterator](){return this._nodes[Symbol.iterator]()}get length(){return this._nodes.length}get maxOffset(){return this._nodes.reduce((t,e)=>t+e.offsetSize,0)}getNode(t){return this._nodes[t]||null}getNodeIndex(t){const e=this._nodes.indexOf(t);return-1==e?null:e}getNodeStartOffset(t){const e=this.getNodeIndex(t);return null===e?null:this._nodes.slice(0,e).reduce((t,e)=>t+e.offsetSize,0)}indexToOffset(t){if(t==this._nodes.length)return this.maxOffset;const e=this._nodes[t];if(!e)throw new T.b("model-nodelist-index-out-of-bounds: Given index cannot be found in the node list.");return this.getNodeStartOffset(e)}offsetToIndex(t){let e=0;for(const n of this._nodes){if(t>=e&&tt.toJSON())}}class Ls extends Ns{constructor(t,e,n){super(e),this.name=t,this._children=new Ds,n&&this._insertChild(0,n)}get childCount(){return this._children.length}get maxOffset(){return this._children.maxOffset}get isEmpty(){return 0===this.childCount}is(t,e=null){return e?"element"==t&&e==this.name:"element"==t||t==this.name||super.is(t)}getChild(t){return this._children.getNode(t)}getChildren(){return this._children[Symbol.iterator]()}getChildIndex(t){return this._children.getNodeIndex(t)}getChildStartOffset(t){return this._children.getNodeStartOffset(t)}offsetToIndex(t){return this._children.offsetToIndex(t)}getNodeByPath(t){let e=this;for(const n of t)e=e.getChild(e.offsetToIndex(n));return e}toJSON(){const t=super.toJSON();if(t.name=this.name,this._children.length>0){t.children=[];for(const e of this._children)t.children.push(e.toJSON())}return t}_clone(t=!1){const e=t?Array.from(this._children).map(t=>t._clone(!0)):null;return new Ls(this.name,this.getAttributes(),e)}_appendChild(t){this._insertChild(this.childCount,t)}_insertChild(t,e){const n=function(t){if("string"==typeof t)return[new Bs(t)];uo(t)||(t=[t]);return Array.from(t).map(t=>"string"==typeof t?new Bs(t):t instanceof Fs?new Bs(t.data,t.getAttributes()):t)}(e);for(const t of n)null!==t.parent&&t._remove(),t.parent=this;this._children._insertNodes(t,n)}_removeChildren(t,e=1){const n=this._children._removeNodes(t,e);for(const t of n)t.parent=null;return n}static fromJSON(t){let e=null;if(t.children){e=[];for(const n of t.children)n.name?e.push(Ls.fromJSON(n)):e.push(Bs.fromJSON(n))}return new Ls(t.name,t.attributes,e)}}class zs{constructor(t={}){if(!t.boundaries&&!t.startPosition)throw new T.b("model-tree-walker-no-start-position: Neither boundaries nor starting position have been defined.");const e=t.direction||"forward";if("forward"!=e&&"backward"!=e)throw new T.b("model-tree-walker-unknown-direction: Only `backward` and `forward` direction allowed.",{direction:e});this.direction=e,this.boundaries=t.boundaries||null,t.startPosition?this.position=t.startPosition.clone():this.position=Hs._createAt(this.boundaries["backward"==this.direction?"end":"start"]),this.position.stickiness="toNone",this.singleCharacters=!!t.singleCharacters,this.shallow=!!t.shallow,this.ignoreElementEnd=!!t.ignoreElementEnd,this._boundaryStartParent=this.boundaries?this.boundaries.start.parent:null,this._boundaryEndParent=this.boundaries?this.boundaries.end.parent:null,this._visitedParent=this.position.parent}[Symbol.iterator](){return this}skip(t){let e,n,o,i;do{o=this.position,i=this._visitedParent,({done:e,value:n}=this.next())}while(!e&&t(n));e||(this.position=o,this._visitedParent=i)}next(){return"forward"==this.direction?this._next():this._previous()}_next(){const t=this.position,e=this.position.clone(),n=this._visitedParent;if(null===n.parent&&e.offset===n.maxOffset)return{done:!0};if(n===this._boundaryEndParent&&e.offset==this.boundaries.end.offset)return{done:!0};const o=e.textNode?e.textNode:e.nodeAfter;if(o instanceof Ls)return this.shallow?e.offset++:(e.path.push(0),this._visitedParent=o),this.position=e,js("elementStart",o,t,e,1);if(o instanceof Bs){let i;if(this.singleCharacters)i=1;else{let t=o.endOffset;this._boundaryEndParent==n&&this.boundaries.end.offsett&&(t=this.boundaries.start.offset),i=e.offset-t}const r=e.offset-o.startOffset,s=new Fs(o,r-i,i);return e.offset-=i,this.position=e,js("text",s,t,e,i)}return e.path.pop(),this.position=e,this._visitedParent=n.parent,js("elementStart",n,t,e,1)}}function js(t,e,n,o,i){return{done:!1,value:{type:t,item:e,previousPosition:n,nextPosition:o,length:i}}}var qs=function(t){var e=null==t?0:t.length;return e?t[e-1]:void 0};class Hs{constructor(t,e,n="toNone"){if(!t.is("element")&&!t.is("documentFragment"))throw new T.b("model-position-root-invalid: Position root invalid.");if(!(e instanceof Array)||0===e.length)throw new T.b("model-position-path-incorrect: Position path must be an array with at least one item.",{path:e});e=t.getPath().concat(e),t=t.root,this.root=t,this.path=e,this.stickiness=n}get offset(){return qs(this.path)}set offset(t){this.path[this.path.length-1]=t}get parent(){let t=this.root;for(let e=0;en.path.length){if(e.offset!==o.maxOffset)return!1;e.path=e.path.slice(0,-1),o=o.parent,e.offset++}else{if(0!==n.offset)return!1;n.path=n.path.slice(0,-1)}}}hasSameParentAs(t){if(this.root!==t.root)return!1;return"same"==q(this.getParentPath(),t.getParentPath())}getTransformedByOperation(t){let e;switch(t.type){case"insert":e=this._getTransformedByInsertOperation(t);break;case"move":case"remove":case"reinsert":e=this._getTransformedByMoveOperation(t);break;case"split":e=this._getTransformedBySplitOperation(t);break;case"merge":e=this._getTransformedByMergeOperation(t);break;default:e=Hs._createAt(this)}return e}_getTransformedByInsertOperation(t){return this._getTransformedByInsertion(t.position,t.howMany)}_getTransformedByMoveOperation(t){return this._getTransformedByMove(t.sourcePosition,t.targetPosition,t.howMany)}_getTransformedBySplitOperation(t){const e=t.movedRange;return e.containsPosition(this)||e.start.isEqual(this)&&"toNext"==this.stickiness?this._getCombined(t.splitPosition,t.moveTargetPosition):t.graveyardPosition?this._getTransformedByMove(t.graveyardPosition,t.insertionPosition,1):this._getTransformedByInsertion(t.insertionPosition,1)}_getTransformedByMergeOperation(t){const e=t.movedRange;let n;return e.containsPosition(this)||e.start.isEqual(this)?(n=this._getCombined(t.sourcePosition,t.targetPosition),t.sourcePosition.isBefore(t.targetPosition)&&(n=n._getTransformedByDeletion(t.deletionPosition,1))):n=this.isEqual(t.deletionPosition)?Hs._createAt(t.deletionPosition):this._getTransformedByMove(t.deletionPosition,t.graveyardPosition,1),n}_getTransformedByDeletion(t,e){const n=Hs._createAt(this);if(this.root!=t.root)return n;if("same"==q(t.getParentPath(),this.getParentPath())){if(t.offsetthis.offset)return null;n.offset-=e}}else if("prefix"==q(t.getParentPath(),this.getParentPath())){const o=t.path.length-1;if(t.offset<=this.path[o]){if(t.offset+e>this.path[o])return null;n.path[o]-=e}}return n}_getTransformedByInsertion(t,e){const n=Hs._createAt(this);if(this.root!=t.root)return n;if("same"==q(t.getParentPath(),this.getParentPath()))(t.offsete+1;){const e=o.maxOffset-n.offset;0!==e&&t.push(new Us(n,n.getShiftedBy(e))),n.path=n.path.slice(0,-1),n.offset++,o=o.parent}for(;n.path.length<=this.end.path.length;){const e=this.end.path[n.path.length-1],o=e-n.offset;0!==o&&t.push(new Us(n,n.getShiftedBy(o))),n.offset=e,n.path.push(0)}return t}getWalker(t={}){return t.boundaries=this,new zs(t)}*getItems(t={}){t.boundaries=this,t.ignoreElementEnd=!0;const e=new zs(t);for(const t of e)yield t.item}*getPositions(t={}){t.boundaries=this;const e=new zs(t);yield e.position;for(const t of e)yield t.nextPosition}getTransformedByOperation(t){switch(t.type){case"insert":return this._getTransformedByInsertOperation(t);case"move":case"remove":case"reinsert":return this._getTransformedByMoveOperation(t);case"split":return[this._getTransformedBySplitOperation(t)];case"merge":return[this._getTransformedByMergeOperation(t)]}return[new Us(this.start,this.end)]}getTransformedByOperations(t){const e=[new Us(this.start,this.end)];for(const n of t)for(let t=0;t0?new this(n,o):new this(o,n)}static _createIn(t){return new this(Hs._createAt(t,0),Hs._createAt(t,t.maxOffset))}static _createOn(t){return this._createFromPositionAndShift(Hs._createBefore(t),t.offsetSize)}static _createFromRanges(t){if(0===t.length)throw new T.b("range-create-from-ranges-empty-array: At least one range has to be passed.");if(1==t.length)return t[0].clone();const e=t[0];t.sort((t,e)=>t.start.isAfter(e.start)?1:-1);const n=t.indexOf(e),o=new this(e.start,e.end);if(n>0)for(let e=n-1;t[e].end.isEqual(o.start);e++)o.start=Hs._createAt(t[e].start);for(let e=n+1;e{if(e.viewPosition)return;const n=this._modelToViewMapping.get(e.modelPosition.parent);e.viewPosition=this._findPositionIn(n,e.modelPosition.offset)},{priority:"low"}),this.on("viewToModelPosition",(t,e)=>{if(e.modelPosition)return;let n=e.viewPosition.parent,o=this._viewToModelMapping.get(n);for(;!o;)n=n.parent,o=this._viewToModelMapping.get(n);const i=this._toModelOffset(e.viewPosition.parent,e.viewPosition.offset,n);e.modelPosition=Hs._createAt(o,i)},{priority:"low"})}bindElements(t,e){this._modelToViewMapping.set(t,e),this._viewToModelMapping.set(e,t)}unbindViewElement(t){const e=this.toModelElement(t);this._viewToModelMapping.delete(t),this._modelToViewMapping.get(e)==t&&this._modelToViewMapping.delete(e)}unbindModelElement(t){const e=this.toViewElement(t);this._modelToViewMapping.delete(t),this._viewToModelMapping.get(e)==t&&this._viewToModelMapping.delete(e)}bindElementToMarker(t,e){const n=this._markerNameToElements.get(e)||new Set;n.add(t),this._markerNameToElements.set(e,n)}unbindElementsFromMarkerName(t){this._markerNameToElements.delete(t)}clearBindings(){this._modelToViewMapping=new WeakMap,this._viewToModelMapping=new WeakMap,this._markerNameToElements=new Map}toModelElement(t){return this._viewToModelMapping.get(t)}toViewElement(t){return this._modelToViewMapping.get(t)}toModelRange(t){return new Us(this.toModelPosition(t.start),this.toModelPosition(t.end))}toViewRange(t){return new Jo(this.toViewPosition(t.start),this.toViewPosition(t.end))}toModelPosition(t){const e={viewPosition:t,mapper:this};return this.fire("viewToModelPosition",e),e.modelPosition}toViewPosition(t,e={isPhantom:!1}){const n={modelPosition:t,mapper:this,isPhantom:e.isPhantom};return this.fire("modelToViewPosition",n),n.viewPosition}markerNameToElements(t){const e=this._markerNameToElements.get(t);if(!e)return null;const n=new Set;for(const t of e)if(t.is("attributeElement"))for(const e of t.getElementsWithSameId())n.add(e);else n.add(t);return n}registerViewToModelLength(t,e){this._viewToModelLengthCallbacks.set(t,e)}_toModelOffset(t,e,n){if(n!=t){return this._toModelOffset(t.parent,t.index,n)+this._toModelOffset(t,e,t)}if(t.is("text"))return e;let o=0;for(let n=0;n1?e[0]+":"+e[1]:e[0]}class Gs{constructor(t={}){this.conversionApi=Io({dispatcher:this},t)}convertChanges(t,e){for(const n of t.getMarkersToRemove())this.convertMarkerRemove(n.name,n.range,e);for(const n of t.getChanges())"insert"==n.type?this.convertInsert(Us._createFromPositionAndShift(n.position,n.length),e):"remove"==n.type?this.convertRemove(n.position,n.length,n.name,e):this.convertAttribute(n.range,n.attributeKey,n.attributeOldValue,n.attributeNewValue,e);for(const n of t.getMarkersToAdd())this.convertMarkerAdd(n.name,n.range,e)}convertInsert(t,e){this.conversionApi.writer=e,this.conversionApi.consumable=this._createInsertConsumable(t);for(const e of t){const t=e.item,n={item:t,range:Us._createFromPositionAndShift(e.previousPosition,e.length)};this._testAndFire("insert",n);for(const e of t.getAttributeKeys())n.attributeKey=e,n.attributeOldValue=null,n.attributeNewValue=t.getAttribute(e),this._testAndFire(`attribute:${e}`,n)}this._clearConversionApi()}convertRemove(t,e,n,o){this.conversionApi.writer=o,this.fire("remove:"+n,{position:t,length:e},this.conversionApi),this._clearConversionApi()}convertAttribute(t,e,n,o,i){this.conversionApi.writer=i,this.conversionApi.consumable=this._createConsumableForRange(t,`attribute:${e}`);for(const i of t){const t={item:i.item,range:Us._createFromPositionAndShift(i.previousPosition,i.length),attributeKey:e,attributeOldValue:n,attributeNewValue:o};this._testAndFire(`attribute:${e}`,t)}this._clearConversionApi()}convertSelection(t,e,n){const o=Array.from(e.getMarkersAtPosition(t.getFirstPosition()));if(this.conversionApi.writer=n,this.conversionApi.consumable=this._createSelectionConsumable(t,o),this.fire("selection",{selection:t},this.conversionApi),t.isCollapsed){for(const e of o){const n=e.getRange();if(!Js(t.getFirstPosition(),e,this.conversionApi.mapper))continue;const o={item:t,markerName:e.name,markerRange:n};this.conversionApi.consumable.test(t,"addMarker:"+e.name)&&this.fire("addMarker:"+e.name,o,this.conversionApi)}for(const e of t.getAttributeKeys()){const n={item:t,range:t.getFirstRange(),attributeKey:e,attributeOldValue:null,attributeNewValue:t.getAttribute(e)};this.conversionApi.consumable.test(t,"attribute:"+n.attributeKey)&&this.fire("attribute:"+n.attributeKey,n,this.conversionApi)}this._clearConversionApi()}}convertMarkerAdd(t,e,n){if(!e.root.document||"$graveyard"==e.root.rootName)return;this.conversionApi.writer=n;const o="addMarker:"+t;if(e.isCollapsed){const n=new $s;return n.add(e,o),this.conversionApi.consumable=n,void this.fire(o,{markerName:t,markerRange:e},this.conversionApi)}this.conversionApi.consumable=this._createConsumableForRange(e,o);for(const n of e.getItems()){if(!this.conversionApi.consumable.test(n,o))continue;const i={item:n,range:Us._createOn(n),markerName:t,markerRange:e};this.fire(o,i,this.conversionApi)}this._clearConversionApi()}convertMarkerRemove(t,e,n){e.root.document&&"$graveyard"!=e.root.rootName&&(this.conversionApi.writer=n,this.fire("removeMarker:"+t,{markerName:t,markerRange:e},this.conversionApi),this._clearConversionApi())}_createInsertConsumable(t){const e=new $s;for(const n of t){const t=n.item;e.add(t,"insert");for(const n of t.getAttributeKeys())e.add(t,"attribute:"+n)}return e}_createConsumableForRange(t,e){const n=new $s;for(const o of t.getItems())n.add(o,e);return n}_createSelectionConsumable(t,e){const n=new $s;n.add(t,"selection");for(const o of e)n.add(t,"addMarker:"+o.name);for(const e of t.getAttributeKeys())n.add(t,"attribute:"+e);return n}_testAndFire(t,e){if(!this.conversionApi.consumable.test(e.item,t))return;const n=e.item.name||"$text";this.fire(t+":"+n,e,this.conversionApi)}_clearConversionApi(){delete this.conversionApi.writer,delete this.conversionApi.consumable}}function Js(t,e,n){const o=e.getRange(),i=Array.from(t.getAncestors());return i.shift(),i.reverse(),!i.some(t=>{if(o.containsItem(t)){return!!n.toViewElement(t).getCustomProperty("addHighlight")}})}j(Gs,M);class Qs{constructor(t,e,n){this._lastRangeBackward=!1,this._ranges=[],this._attrs=new Map,t&&this.setTo(t,e,n)}get anchor(){if(this._ranges.length>0){const t=this._ranges[this._ranges.length-1];return this._lastRangeBackward?t.end:t.start}return null}get focus(){if(this._ranges.length>0){const t=this._ranges[this._ranges.length-1];return this._lastRangeBackward?t.start:t.end}return null}get isCollapsed(){return 1===this._ranges.length&&this._ranges[0].isCollapsed}get rangeCount(){return this._ranges.length}get isBackward(){return!this.isCollapsed&&this._lastRangeBackward}isEqual(t){if(this.rangeCount!=t.rangeCount)return!1;if(0===this.rangeCount)return!0;if(!this.anchor.isEqual(t.anchor)||!this.focus.isEqual(t.focus))return!1;for(const e of this._ranges){let n=!1;for(const o of t._ranges)if(e.isEqual(o)){n=!0;break}if(!n)return!1}return!0}*getRanges(){for(const t of this._ranges)yield new Us(t.start,t.end)}getFirstRange(){let t=null;for(const e of this._ranges)t&&!e.start.isBefore(t.start)||(t=e);return t?new Us(t.start,t.end):null}getLastRange(){let t=null;for(const e of this._ranges)t&&!e.end.isAfter(t.end)||(t=e);return t?new Us(t.start,t.end):null}getFirstPosition(){const t=this.getFirstRange();return t?t.start.clone():null}getLastPosition(){const t=this.getLastRange();return t?t.end.clone():null}setTo(t,e,n){if(null===t)this._setRanges([]);else if(t instanceof Qs)this._setRanges(t.getRanges(),t.isBackward);else if(t&&"function"==typeof t.getRanges)this._setRanges(t.getRanges(),t.isBackward);else if(t instanceof Us)this._setRanges([t],!!e&&!!e.backward);else if(t instanceof Hs)this._setRanges([new Us(t)]);else if(t instanceof Ns){const o=!!n&&!!n.backward;let i;if("in"==e)i=Us._createIn(t);else if("on"==e)i=Us._createOn(t);else{if(void 0===e)throw new T.b("model-selection-setTo-required-second-parameter: selection.setTo requires the second parameter when the first parameter is a node.");i=new Us(Hs._createAt(t,e))}this._setRanges([i],o)}else{if(!uo(t))throw new T.b("model-selection-setTo-not-selectable: Cannot set selection to given place.");this._setRanges(t,e&&!!e.backward)}}_setRanges(t,e=!1){const n=(t=Array.from(t)).some(t=>{if(!(t instanceof Us))throw new T.b("model-selection-set-ranges-not-range: Selection range set to an object that is not an instance of model.Range.");return this._ranges.every(e=>!e.isEqual(t))});if(t.length!==this._ranges.length||n){this._removeAllRanges();for(const e of t)this._pushRange(e);this._lastRangeBackward=!!e,this.fire("change:range",{directChange:!0})}}setFocus(t,e){if(null===this.anchor)throw new T.b("model-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.");const n=Hs._createAt(t,e);if("same"==n.compareWith(this.focus))return;const o=this.anchor;this._ranges.length&&this._popRange(),"before"==n.compareWith(o)?(this._pushRange(new Us(n,o)),this._lastRangeBackward=!0):(this._pushRange(new Us(o,n)),this._lastRangeBackward=!1),this.fire("change:range",{directChange:!0})}getAttribute(t){return this._attrs.get(t)}getAttributes(){return this._attrs.entries()}getAttributeKeys(){return this._attrs.keys()}hasAttribute(t){return this._attrs.has(t)}removeAttribute(t){this.hasAttribute(t)&&(this._attrs.delete(t),this.fire("change:attribute",{attributeKeys:[t],directChange:!0}))}setAttribute(t,e){this.getAttribute(t)!==e&&(this._attrs.set(t,e),this.fire("change:attribute",{attributeKeys:[t],directChange:!0}))}getSelectedElement(){if(1!==this.rangeCount)return null;const t=this.getFirstRange(),e=t.start.nodeAfter,n=t.end.nodeBefore;return e instanceof Ls&&e==n?e:null}*getSelectedBlocks(){const t=new WeakSet;for(const e of this.getRanges()){const n=Ys(e.start,t);n&&(yield n);for(const n of e.getWalker())"elementEnd"==n.type&&Xs(n.item,t)&&(yield n.item);const o=Ys(e.end,t);o&&!e.end.isTouching(Hs._createAt(o,0))&&(yield o)}}containsEntireContent(t=this.anchor.root){const e=Hs._createAt(t,0),n=Hs._createAt(t,"end");return e.isTouching(this.getFirstPosition())&&n.isTouching(this.getLastPosition())}_pushRange(t){this._checkRange(t),this._ranges.push(new Us(t.start,t.end))}_checkRange(t){for(let e=0;e0;)this._popRange()}_popRange(){this._ranges.pop()}}function Xs(t,e){return!e.has(t)&&(e.add(t),t.document.model.schema.isBlock(t)&&t.parent)}function Ys(t,e){const n=t.parent.getAncestors({parentFirst:!0,includeSelf:!0}),o=n.find(t=>Xs(t,e));return n.forEach(t=>e.add(t)),o}j(Qs,M);class Zs extends Us{constructor(t,e){super(t,e),function(){this.listenTo(this.root.document.model,"applyOperation",(t,e)=>{const n=e[0];n.isDocumentOperation&&function(t){const e=this.getTransformedByOperation(t),n=Us._createFromRanges(e),o=!n.isEqual(this),i=function(t,e){switch(e.type){case"insert":return t.containsPosition(e.position);case"move":case"remove":case"reinsert":case"merge":return t.containsPosition(e.sourcePosition)||t.start.isEqual(e.sourcePosition)||t.containsPosition(e.targetPosition);case"split":return t.containsPosition(e.splitPosition)||t.containsPosition(e.insertionPosition)}return!1}(this,t);let r=null;if(o){"$graveyard"==n.root.rootName&&(r="remove"==t.type?t.sourcePosition:t.deletionPosition);const e=this.toRange();this.start=n.start,this.end=n.end,this.fire("change:range",e,{deletionPosition:r})}else i&&this.fire("change:content",this.toRange(),{deletionPosition:r})}.call(this,n)},{priority:"low"})}.call(this)}detach(){this.stopListening()}toRange(){return new Us(this.start,this.end)}static fromRange(t){return new Zs(t.start,t.end)}}j(Zs,M);const ta="selection:";class ea{constructor(t){this._selection=new na(t),this._selection.delegate("change:range").to(this),this._selection.delegate("change:attribute").to(this)}get isCollapsed(){return this._selection.isCollapsed}get anchor(){return this._selection.anchor}get focus(){return this._selection.focus}get rangeCount(){return this._selection.rangeCount}get hasOwnRange(){return this._selection.hasOwnRange}get isBackward(){return this._selection.isBackward}get isGravityOverridden(){return this._selection.isGravityOverridden}get _ranges(){return this._selection._ranges}getRanges(){return this._selection.getRanges()}getFirstPosition(){return this._selection.getFirstPosition()}getLastPosition(){return this._selection.getLastPosition()}getFirstRange(){return this._selection.getFirstRange()}getLastRange(){return this._selection.getLastRange()}getSelectedBlocks(){return this._selection.getSelectedBlocks()}getSelectedElement(){return this._selection.getSelectedElement()}containsEntireContent(t){return this._selection.containsEntireContent(t)}destroy(){this._selection.destroy()}getAttributeKeys(){return this._selection.getAttributeKeys()}getAttributes(){return this._selection.getAttributes()}getAttribute(t){return this._selection.getAttribute(t)}hasAttribute(t){return this._selection.hasAttribute(t)}_setFocus(t,e){this._selection.setFocus(t,e)}_setTo(t,e,n){this._selection.setTo(t,e,n)}_setAttribute(t,e){this._selection.setAttribute(t,e)}_removeAttribute(t){this._selection.removeAttribute(t)}_getStoredAttributes(){return this._selection._getStoredAttributes()}_overrideGravity(){return this._selection.overrideGravity()}_restoreGravity(t){this._selection.restoreGravity(t)}static _getStoreAttributeKey(t){return ta+t}static _isStoreAttributeKey(t){return t.startsWith(ta)}}j(ea,M);class na extends Qs{constructor(t){super(),this._model=t.model,this._document=t,this._attributePriority=new Map,this._fixGraveyardRangesData=[],this._hasChangedRange=!1,this._overriddenGravityRegister=new Set,this.on("change:range",()=>{for(const t of this.getRanges())if(!this._document._validateSelectionRange(t))throw new T.b("document-selection-wrong-position: Range from document selection starts or ends at incorrect position.",{range:t})}),this.listenTo(this._document,"change",(t,e)=>{this._updateAttributes(!1),function(t,e){const n=t.document.differ;for(const o of n.getChanges()){if("insert"!=o.type)continue;const n=o.position.parent,i=o.length===n.maxOffset;i&&t.enqueueChange(e,t=>{const e=Array.from(n.getAttributeKeys()).filter(t=>t.startsWith(ta));for(const o of e)t.removeAttribute(o,n)})}}(this._model,e)}),this.listenTo(this._model,"applyOperation",()=>{for(;this._fixGraveyardRangesData.length;){const{liveRange:t,sourcePosition:e}=this._fixGraveyardRangesData.shift();this._fixGraveyardSelection(t,e)}this._hasChangedRange&&(this._hasChangedRange=!1,this.fire("change:range",{directChange:!1}))},{priority:"lowest"})}get isCollapsed(){return 0===this._ranges.length?this._document._getDefaultRange().isCollapsed:super.isCollapsed}get anchor(){return super.anchor||this._document._getDefaultRange().start}get focus(){return super.focus||this._document._getDefaultRange().end}get rangeCount(){return this._ranges.length?this._ranges.length:1}get hasOwnRange(){return this._ranges.length>0}get isGravityOverridden(){return!!this._overriddenGravityRegister.size}destroy(){for(let t=0;t{this._hasChangedRange=!0,e.root==this._document.graveyard&&this._fixGraveyardRangesData.push({liveRange:e,sourcePosition:o.deletionPosition})}),e}_updateAttributes(t){const e=Ms(this._getSurroundingAttributes()),n=Ms(this.getAttributes());if(t)this._attributePriority=new Map,this._attrs=new Map;else for(const[t,e]of this._attributePriority)"low"==e&&(this._attrs.delete(t),this._attributePriority.delete(t));this._setAttributesTo(e);const o=[];for(const[t,e]of this.getAttributes())n.has(t)&&n.get(t)===e||o.push(t);for(const[t]of n)this.hasAttribute(t)||o.push(t);o.length>0&&this.fire("change:attribute",{attributeKeys:o,directChange:!1})}_setAttribute(t,e,n=!0){const o=n?"normal":"low";return("low"!=o||"normal"!=this._attributePriority.get(t))&&(super.getAttribute(t)!==e&&(this._attrs.set(t,e),this._attributePriority.set(t,o),!0))}_removeAttribute(t,e=!0){const n=e?"normal":"low";return("low"!=n||"normal"!=this._attributePriority.get(t))&&(this._attributePriority.set(t,n),!!super.hasAttribute(t)&&(this._attrs.delete(t),!0))}_setAttributesTo(t){const e=new Set;for(const[e,n]of this.getAttributes())t.get(e)!==n&&this._removeAttribute(e,!1);for(const[n,o]of t){this._setAttribute(n,o,!1)&&e.add(n)}return e}*_getStoredAttributes(){const t=this.getFirstPosition().parent;if(this.isCollapsed&&t.isEmpty)for(const e of t.getAttributeKeys())if(e.startsWith(ta)){yield[e.substr(ta.length),t.getAttribute(e)]}}_getSurroundingAttributes(){const t=this.getFirstPosition(),e=this._model.schema;let n=null;if(this.isCollapsed){const e=t.textNode?t.textNode:t.nodeBefore,o=t.textNode?t.textNode:t.nodeAfter;if(this.isGravityOverridden||(n=oa(e)),n||(n=oa(o)),!this.isGravityOverridden&&!n){let t=e;for(;t&&!n;)n=oa(t=t.previousSibling)}if(!n){let t=o;for(;t&&!n;)n=oa(t=t.nextSibling)}n||(n=this._getStoredAttributes())}else{const t=this.getFirstRange();for(const o of t){if(o.item.is("element")&&e.isObject(o.item))break;"text"==o.type&&null===n&&(n=o.item.getAttributes())}}return n}_fixGraveyardSelection(t,e){const n=e.clone(),o=this._model.schema.getNearestSelectionRange(n),i=this._ranges.indexOf(t);if(this._ranges.splice(i,1),t.detach(),o){const t=this._prepareRange(o);this._ranges.splice(i,0,t)}}}function oa(t){return t instanceof Fs||t instanceof Bs?t.getAttributes():null}var ia=1,ra=4;var sa=function(t){return io(t,ia|ra)};function aa(t){return(t=sa(t)).view=da(t.view,"container"),e=>{e.on("insert:"+t.model,function(t){return(e,n,o)=>{const i=t(n.item,o.writer);if(!i)return;if(!o.consumable.consume(n.item,"insert"))return;const r=o.mapper.toViewPosition(n.range.start);o.mapper.bindElements(n.item,i),o.writer.insert(r,i)}}(t.view),{priority:t.converterPriority||"normal"})}}function ca(t){let e="attribute:"+((t=sa(t)).model.key?t.model.key:t.model);if(t.model.name&&(e+=":"+t.model.name),t.model.values)for(const e of t.model.values)t.view[e]=da(t.view[e],"attribute");else t.view=da(t.view,"attribute");const n=ha(t);return o=>{o.on(e,function(t){return(e,n,o)=>{const i=t(n.attributeOldValue,o.writer),r=t(n.attributeNewValue,o.writer);if(!i&&!r)return;if(!o.consumable.consume(n.item,e.name))return;const s=o.writer,a=s.document.selection;if(n.item instanceof Qs||n.item instanceof ea)s.wrap(a.getFirstRange(),r);else{let t=o.mapper.toViewRange(n.range);null!==n.attributeOldValue&&i&&(t=s.unwrap(t,i)),null!==n.attributeNewValue&&r&&s.wrap(t,r)}}}(n),{priority:t.converterPriority||"normal"})}}function la(t){let e="attribute:"+((t=sa(t)).model.key?t.model.key:t.model);if(t.model.name&&(e+=":"+t.model.name),t.model.values)for(const e of t.model.values)t.view[e]=ua(t.view[e]);else t.view=ua(t.view);const n=ha(t);return o=>{o.on(e,function(t){return t=t||((t,e)=>({value:t,key:e.attributeKey})),(e,n,o)=>{const i=t(n.attributeOldValue,n),r=t(n.attributeNewValue,n);if(!i&&!r)return;if(!o.consumable.consume(n.item,e.name))return;const s=o.mapper.toViewElement(n.item),a=o.writer;if(s){if(null!==n.attributeOldValue&&i)if("class"==i.key){const t=Array.isArray(i.value)?i.value:[i.value];for(const e of t)a.removeClass(e,s)}else if("style"==i.key){const t=Object.keys(i.value);for(const e of t)a.removeStyle(e,s)}else a.removeAttribute(i.key,s);if(null!==n.attributeNewValue&&r)if("class"==r.key){const t=Array.isArray(r.value)?r.value:[r.value];for(const e of t)a.addClass(e,s)}else if("style"==r.key){const t=Object.keys(r.value);for(const e of t)a.setStyle(e,r.value[e],s)}else a.setAttribute(r.key,r.value,s)}else fs.a.warn("conversion-attribute-to-attribute-on-text: Trying to convert text node's attribute with attribute-to-attribute converter.")}}(n),{priority:t.converterPriority||"normal"})}}function da(t,e){return"function"==typeof t?t:(n,o)=>(function(t,e,n){"string"==typeof t&&(t={name:t});let o;const i=Object.assign({},t.attributes);if("container"==n)o=e.createContainerElement(t.name,i);else if("attribute"==n){const n={priority:t.priority||oi.DEFAULT_PRIORITY};o=e.createAttributeElement(t.name,i,n)}else o=e.createUIElement(t.name,i);if(t.styles){const n=Object.keys(t.styles);for(const i of n)e.setStyle(i,t.styles[i],o)}if(t.classes){const n=t.classes;if("string"==typeof n)e.addClass(n,o);else for(const t of n)e.addClass(t,o)}return o})(t,o,e)}function ha(t){return t.model.values?(e,n)=>{const o=t.view[e];return o?o(e,n):null}:t.view}function ua(t){return"string"==typeof t?e=>({key:t,value:e}):"object"==typeof t?t.value?()=>t:e=>({key:t.key,value:e}):t}class fa{constructor(t){this.model=t,this.view=new Vs,this.mapper=new Ws,this.downcastDispatcher=new Gs({mapper:this.mapper});const e=this.model.document,n=e.selection,o=this.model.markers;this.listenTo(this.model,"_beforeChanges",()=>{this.view._renderingDisabled=!0},{priority:"highest"}),this.listenTo(this.model,"_afterChanges",()=>{this.view._renderingDisabled=!1,this.view.render()},{priority:"lowest"}),this.listenTo(e,"change",()=>{this.view.change(t=>{this.downcastDispatcher.convertChanges(e.differ,t),this.downcastDispatcher.convertSelection(n,o,t)})},{priority:"low"}),this.listenTo(this.view.document,"selectionChange",function(t,e){return(n,o)=>{const i=o.newSelection,r=new Qs,s=[];for(const t of i.getRanges())s.push(e.toModelRange(t));r.setTo(s,{backward:i.isBackward}),r.isEqual(t.document.selection)||t.change(t=>{t.setSelection(r)})}}(this.model,this.mapper)),this.downcastDispatcher.on("insert:$text",(t,e,n)=>{if(!n.consumable.consume(e.item,"insert"))return;const o=n.writer,i=n.mapper.toViewPosition(e.range.start),r=o.createText(e.item.data);o.insert(i,r)},{priority:"lowest"}),this.downcastDispatcher.on("remove",(t,e,n)=>{const o=n.mapper.toViewPosition(e.position),i=e.position.getShiftedBy(e.length),r=n.mapper.toViewPosition(i,{isPhantom:!0}),s=n.writer.createRange(o,r),a=n.writer.remove(s.getTrimmed());for(const t of n.writer.createRangeIn(a).getItems())n.mapper.unbindViewElement(t)},{priority:"low"}),this.downcastDispatcher.on("selection",(t,e,n)=>{const o=n.writer,i=o.document.selection;for(const t of i.getRanges())t.isCollapsed&&t.end.parent.document&&n.writer.mergeAttributes(t.start);o.setSelection(null)},{priority:"low"}),this.downcastDispatcher.on("selection",(t,e,n)=>{const o=e.selection;if(o.isCollapsed)return;if(!n.consumable.consume(o,"selection"))return;const i=[];for(const t of o.getRanges()){const e=n.mapper.toViewRange(t);i.push(e)}n.writer.setSelection(i,{backward:o.isBackward})},{priority:"low"}),this.downcastDispatcher.on("selection",(t,e,n)=>{const o=e.selection;if(!o.isCollapsed)return;if(!n.consumable.consume(o,"selection"))return;const i=n.writer,r=o.getFirstPosition(),s=n.mapper.toViewPosition(r),a=i.breakAttributes(s);i.setSelection(a)},{priority:"low"}),this.view.document.roots.bindTo(this.model.document.roots).using(t=>{if("$graveyard"==t.rootName)return null;const e=new $o(t.name);return e.rootName=t.rootName,e._document=this.view.document,this.mapper.bindElements(t,e),e})}destroy(){this.view.destroy(),this.stopListening()}}j(fa,Fo);class pa{constructor(t,e=[]){this._editor=t,this._availablePlugins=new Map,this._plugins=new Map;for(const t of e)this._availablePlugins.set(t,t),t.pluginName&&this._availablePlugins.set(t.pluginName,t)}*[Symbol.iterator](){for(const t of this._plugins)"function"==typeof t[0]&&(yield t)}get(t){return this._plugins.get(t)}load(t,e=[]){const n=this,o=this._editor,i=new Set,r=[],s=h(t),a=h(e),c=function(t){const e=[];for(const n of t)d(n)||e.push(n);return e.length?e:null}(t);if(c){const t="plugincollection-plugin-not-found: Some plugins are not available and could not be loaded.";return fs.a.error(t,{plugins:c}),Promise.reject(new T.b(t,{plugins:c}))}return Promise.all(s.map(l)).then(()=>r);function l(t){if(!a.includes(t)&&!n.get(t)&&!i.has(t))return function(t){return new Promise(s=>{i.add(t),t.requires&&t.requires.forEach(n=>{const o=d(n);if(e.includes(o))throw new T.b("plugincollection-required: Cannot load a plugin because one of its dependencies is listed inthe `removePlugins` option.",{plugin:o,requiredBy:t});l(o)});const a=new t(o);n._add(t,a),r.push(a),s()})}(t).catch(e=>{throw fs.a.error("plugincollection-load: It was not possible to load the plugin.",{plugin:t}),e})}function d(t){return"function"==typeof t?t:n._availablePlugins.get(t)}function h(t){return t.map(t=>d(t)).filter(t=>!!t)}}destroy(){const t=Array.from(this).map(([,t])=>t).filter(t=>"function"==typeof t.destroy).map(t=>t.destroy());return Promise.all(t)}_add(t,e){this._plugins.set(t,e);const n=t.pluginName;n&&(this._plugins.has(n)?fs.a.warn("plugincollection-plugin-name-conflict: Two plugins with the same name were loaded.",{pluginName:n,plugin1:this._plugins.get(n).constructor,plugin2:t}):this._plugins.set(n,e))}}class ga{constructor(){this._commands=new Map}add(t,e){this._commands.set(t,e)}get(t){return this._commands.get(t)}execute(t,...e){const n=this.get(t);if(!n)throw new T.b("commandcollection-command-not-found: Command does not 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T.b("schema-cannot-register-item-twice: A single item cannot be registered twice in the schema.",{itemName:t});this._sourceDefinitions[t]=[Object.assign({},e)],this._clearCache()}extend(t,e){if(!this._sourceDefinitions[t])throw new T.b("schema-cannot-extend-missing-item: Cannot extend an item which was not registered yet.",{itemName:t});this._sourceDefinitions[t].push(Object.assign({},e)),this._clearCache()}getDefinitions(){return this._compiledDefinitions||this._compile(),this._compiledDefinitions}getDefinition(t){let e;return e="string"==typeof t?t:t.is&&(t.is("text")||t.is("textProxy"))?"$text":t.name,this.getDefinitions()[e]}isRegistered(t){return!!this.getDefinition(t)}isBlock(t){const e=this.getDefinition(t);return!(!e||!e.isBlock)}isLimit(t){const e=this.getDefinition(t);return!!e&&!(!e.isLimit&&!e.isObject)}isObject(t){const e=this.getDefinition(t);return!(!e||!e.isObject)}checkChild(t,e){return!!e&&this._checkContextMatch(e,t)}checkAttribute(t,e){const n=this.getDefinition(t.last);return!!n&&n.allowAttributes.includes(e)}checkMerge(t,e=null){if(t instanceof Hs){const e=t.nodeBefore,n=t.nodeAfter;if(!(e instanceof Ls))throw new T.b("schema-check-merge-no-element-before: The node before the merge position must be an element.");if(!(n instanceof Ls))throw new T.b("schema-check-merge-no-element-after: The node after the merge position must be an element.");return this.checkMerge(e,n)}for(const n of e.getChildren())if(!this.checkChild(t,n))return!1;return!0}addChildCheck(t){this.on("checkChild",(e,[n,o])=>{if(!o)return;const i=t(n,o);"boolean"==typeof i&&(e.stop(),e.return=i)},{priority:"high"})}addAttributeCheck(t){this.on("checkAttribute",(e,[n,o])=>{const i=t(n,o);"boolean"==typeof i&&(e.stop(),e.return=i)},{priority:"high"})}getLimitElement(t){let e;if(t instanceof Hs)e=t.parent;else{e=(t instanceof Us?[t]:Array.from(t.getRanges())).reduce((t,e)=>{const n=e.getCommonAncestor();return t?t.getCommonAncestor(n,{includeSelf:!0}):n},null)}for(;!this.isLimit(e)&&e.parent;)e=e.parent;return e}checkAttributeInSelection(t,e){if(t.isCollapsed){const n=[...t.getFirstPosition().getAncestors(),new Bs("",t.getAttributes())];return this.checkAttribute(n,e)}{const n=t.getRanges();for(const t of n)for(const n of t)if(this.checkAttribute(n.item,e))return!0}return!1}*getValidRanges(t,e){t=function*(t){for(const e of t)yield*e.getMinimalFlatRanges()}(t);for(const n of t)yield*this._getValidRangesForRange(n,e)}*_getValidRangesForRange(t,e){let n=t.start,o=t.start;for(const i of t.getItems({shallow:!0}))i.is("element")&&(yield*this._getValidRangesForRange(Us._createIn(i),e)),this.checkAttribute(i,e)||(n.isEqual(o)||(yield new Us(n,o)),n=Hs._createAfter(i)),o=Hs._createAfter(i);n.isEqual(o)||(yield new Us(n,o))}getNearestSelectionRange(t,e="both"){if(this.checkChild(t,"$text"))return new Us(t);let n,o;"both"!=e&&"backward"!=e||(n=new zs({startPosition:t,direction:"backward"})),"both"!=e&&"forward"!=e||(o=new zs({startPosition:t}));for(const t of function*(t,e){let n=!1;for(;!n;){if(n=!0,t){const e=t.next();e.done||(n=!1,yield{walker:t,value:e.value})}if(e){const t=e.next();t.done||(n=!1,yield{walker:e,value:t.value})}}}(n,o)){const e=t.walker==n?"elementEnd":"elementStart",o=t.value;if(o.type==e&&this.isObject(o.item))return Us._createOn(o.item);if(this.checkChild(o.nextPosition,"$text"))return new Us(o.nextPosition)}return null}findAllowedParent(t,e){let n=e.parent;for(;n;){if(this.checkChild(n,t))return n;if(this.isLimit(n))return null;n=n.parent}return null}removeDisallowedAttributes(t,e){for(const n of t){for(const t of n.getAttributeKeys())this.checkAttribute(n,t)||e.removeAttribute(t,n);n.is("element")&&this.removeDisallowedAttributes(n.getChildren(),e)}}createContext(t){return new ka(t)}_clearCache(){this._compiledDefinitions=null}_compile(){const t={},e=this._sourceDefinitions,n=Object.keys(e);for(const o 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Pa(t,e){const n=t[e];for(const e of n.inheritTypesFrom){const o=t[e];if(o){const t=Object.keys(o).filter(t=>t.startsWith("is"));for(const e of t)e in n||(n[e]=o[e])}}delete n.inheritTypesFrom}function Ta(t,e){const n=t[e],o=n.allowIn.filter(e=>t[e]);n.allowIn=Array.from(new Set(o))}function Sa(t,e){const n=t[e];n.allowAttributes=Array.from(new Set(n.allowAttributes))}function Ea(t,e,n){for(const o of t)"string"==typeof o[n]?e[n].push(o[n]):Array.isArray(o[n])&&e[n].push(...o[n])}function Ra(t,e){const n=t[e];return function(t){return Object.keys(t).map(e=>t[e])}(t).filter(t=>t.allowIn.includes(n.name))}function Oa(t){return"string"==typeof t?{name:t,*getAttributeKeys(){},getAttribute(){}}:{name:t.is("element")?t.name:"$text",*getAttributeKeys(){yield*t.getAttributeKeys()},getAttribute:e=>t.getAttribute(e)}}class Ia{constructor(t={}){this._removeIfEmpty=new 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n=this.conversionApi.schema.findAllowedParent(t,e);if(!n)return null;if(n===e.parent)return{position:e};if(this._modelCursor.parent.getAncestors().includes(n))return null;const o=this.conversionApi.writer.split(e,n);for(const t of o.range.getPositions())t.isEqual(o.position)||this._removeIfEmpty.add(t.parent);return{position:o.position,cursorParent:o.range.end.parent}}_removeEmptyElements(){let t=!1;for(const e of this._removeIfEmpty)e.isEmpty&&(this.conversionApi.writer.remove(e),this._removeIfEmpty.delete(e),t=!0);t&&this._removeEmptyElements()}}function Va(t){const e=function(t){const e=new fo(t.view);return(n,o,i)=>{const r=e.match(o.viewItem);if(!r)return;r.match.name=!0;const s=function(t,e,n){return t instanceof Function?t(e,n):n.createElement(t)}(t.model,o.viewItem,i.writer);if(!s)return;if(!i.consumable.test(o.viewItem,r.match))return;const a=i.splitToAllowedParent(s,o.modelCursor);if(!a)return;i.writer.insert(s,a.position);const c=i.convertChildren(o.viewItem,i.writer.createPositionAt(s,0));i.consumable.consume(o.viewItem,r.match),o.modelRange=new Us(i.writer.createPositionBefore(s),i.writer.createPositionAfter(c.modelCursor.parent)),a.cursorParent?o.modelCursor=i.writer.createPositionAt(a.cursorParent,0):o.modelCursor=o.modelRange.end}}(t=sa(t)),n=Ba(t),o=n?"element:"+n:"element";return n=>{n.on(o,e,{priority:t.converterPriority||"normal"})}}function Ma(t){Fa(t=sa(t));const e=Da(t,!1),n=Ba(t),o=n?"element:"+n:"element";return n=>{n.on(o,e,{priority:t.converterPriority||"normal"})}}function Na(t){let e=null;("string"==typeof(t=sa(t)).view||t.view.key)&&(e=function(t){"string"==typeof t.view&&(t.view={key:t.view});const e=t.view.key;let n;if("class"==e||"style"==e){const o="class"==e?"classes":"styles";n={[o]:t.view.value}}else{const o=void 0===t.view.value?/[\s\S]*/:t.view.value;n={attributes:{[e]:o}}}t.view.name&&(n.name=t.view.name);return t.view=n,e}(t)),Fa(t,e);const n=Da(t,!0);return e=>{e.on("element",n,{priority:t.converterPriority||"low"})}}function Ba(t){return"string"==typeof t.view?t.view:"object"==typeof t.view&&"string"==typeof t.view.name?t.view.name:null}function Fa(t,e=null){const n=null===e||(t=>t.getAttribute(e)),o="object"!=typeof t.model?t.model:t.model.key,i="object"!=typeof t.model||void 0===t.model.value?n:t.model.value;t.model={key:o,value:i}}function Da(t,e){const n=new fo(t.view);return(o,i,r)=>{const s=n.match(i.viewItem);if(!s)return;const a=t.model.key,c="function"==typeof t.model.value?t.model.value(i.viewItem):t.model.value;null!==c&&(!function(t){if("object"==typeof t.view&&!Ba(t))return!1;return!t.view.classes&&!t.view.attributes&&!t.view.styles}(t)?delete s.match.name:s.match.name=!0,r.consumable.test(i.viewItem,s.match)&&(i.modelRange||(i=Object.assign(i,r.convertChildren(i.viewItem,i.modelCursor))),function(t,e,n,o){let i=!1;for(const r of Array.from(t.getItems({shallow:n})))o.schema.checkAttribute(r,e.key)&&(o.writer.setAttribute(e.key,e.value,r),i=!0);return i}(i.modelRange,{key:a,value:c},e,r)&&r.consumable.consume(i.viewItem,s.match)))}}j(Ia,M);class La{constructor(t,e){this.model=t,this.processor=e,this.mapper=new Ws,this.downcastDispatcher=new Gs({mapper:this.mapper}),this.downcastDispatcher.on("insert:$text",(t,e,n)=>{if(!n.consumable.consume(e.item,"insert"))return;const o=n.writer,i=n.mapper.toViewPosition(e.range.start),r=o.createText(e.item.data);o.insert(i,r)},{priority:"lowest"}),this.upcastDispatcher=new Ia({schema:t.schema}),this.upcastDispatcher.on("text",(t,e,n)=>{if(n.schema.checkChild(e.modelCursor,"$text")&&n.consumable.consume(e.viewItem)){const t=n.writer.createText(e.viewItem.data);n.writer.insert(t,e.modelCursor),e.modelRange=Us._createFromPositionAndShift(e.modelCursor,t.offsetSize),e.modelCursor=e.modelRange.end}},{priority:"lowest"}),this.upcastDispatcher.on("element",(t,e,n)=>{if(!e.modelRange&&n.consumable.consume(e.viewItem,{name:!0})){const{modelRange:t,modelCursor:o}=n.convertChildren(e.viewItem,e.modelCursor);e.modelRange=t,e.modelCursor=o}},{priority:"lowest"}),this.upcastDispatcher.on("documentFragment",(t,e,n)=>{if(!e.modelRange&&n.consumable.consume(e.viewItem,{name:!0})){const{modelRange:t,modelCursor:o}=n.convertChildren(e.viewItem,e.modelCursor);e.modelRange=t,e.modelCursor=o}},{priority:"lowest"}),this.decorate("init")}get(t="main"){return this.stringify(this.model.document.getRoot(t))}stringify(t){const e=this.toView(t);return this.processor.toData(e)}toView(t){this.mapper.clearBindings();const e=Us._createIn(t),n=new _i,o=new vi(new ei);if(this.mapper.bindElements(t,n),this.downcastDispatcher.convertInsert(e,o),!t.is("documentFragment")){const e=function(t){const e=[],n=t.root.document;if(!n)return[];const o=Us._createIn(t);for(const t of n.model.markers){const n=o.getIntersection(t.getRange());n&&e.push([t.name,n])}return e}(t);for(const[t,n]of e)this.downcastDispatcher.convertMarkerAdd(t,n,o)}return n}init(t,e="main"){if(this.model.document.version)throw new T.b("datacontroller-init-document-not-empty: Trying to set initial data to not empty document.");const n=this.model.document.getRoot(e);return this.model.enqueueChange("transparent",e=>{e.insert(this.parse(t,n),n,0)}),Promise.resolve()}set(t,e="main"){const n=this.model.document.getRoot(e);this.model.enqueueChange("transparent",e=>{e.setSelection(null),e.removeSelectionAttribute(this.model.document.selection.getAttributeKeys()),e.remove(e.createRangeIn(n)),e.insert(this.parse(t,n),n,0)})}parse(t,e="$root"){const n=this.processor.toView(t);return this.toModel(n,e)}toModel(t,e="$root"){return this.model.change(n=>this.upcastDispatcher.convert(t,n,e))}destroy(){}}j(La,Fo);class za{constructor(){this._dispatchersGroups=new Map}register(t,e){if(this._dispatchersGroups.has(t))throw new T.b("conversion-register-group-exists: Trying to register a group name that was already registered.");this._dispatchersGroups.set(t,e)}for(t){const e=this._getDispatchers(t);return{add(t){return function(t,e){for(const n of t)e(n)}(e,t),this}}}elementToElement(t){this.for("downcast").add(aa(t));for(const{model:e,view:n}of ja(t))this.for("upcast").add(Va({model:e,view:n,converterPriority:t.converterPriority}))}attributeToElement(t){this.for("downcast").add(ca(t));for(const{model:e,view:n}of ja(t))this.for("upcast").add(Ma({view:n,model:e,priority:t.priority}))}attributeToAttribute(t){this.for("downcast").add(la(t));for(const{model:e,view:n}of ja(t))this.for("upcast").add(Na({view:n,model:e}))}_getDispatchers(t){const e=this._dispatchersGroups.get(t);if(!e)throw new T.b("conversion-for-unknown-group: Trying to add a converter to an unknown dispatchers group.");return e}}function*ja(t){if(t.model.values)for(const e of t.model.values){yield*qa({key:t.model.key,value:e},t.view[e],t.upcastAlso?t.upcastAlso[e]:void 0)}else yield*qa(t.model,t.view,t.upcastAlso)}function*qa(t,e,n){if(yield{model:t,view:e},n){n=Array.isArray(n)?n:[n];for(const e of n)yield{model:t,view:e}}}class Ha{constructor(t="default"){this.operations=[],this.type=t}get baseVersion(){for(const t of this.operations)if(null!==t.baseVersion)return t.baseVersion;return null}addOperation(t){return t.batch=this,this.operations.push(t),t}}class Ua{constructor(t){this.baseVersion=t,this.isDocumentOperation=null!==this.baseVersion,this.batch=null}_validate(){}toJSON(){const t=Object.assign({},this);return t.__className=this.constructor.className,delete t.batch,delete t.isDocumentOperation,t}static get className(){return"Operation"}static fromJSON(t){return new this(t.baseVersion)}}class Wa{constructor(t){this.markers=new Map,this._children=new Ds,t&&this._insertChild(0,t)}[Symbol.iterator](){return this.getChildren()}get childCount(){return this._children.length}get maxOffset(){return this._children.maxOffset}get isEmpty(){return 0===this.childCount}get root(){return this}get parent(){return null}is(t){return"documentFragment"==t}getChild(t){return this._children.getNode(t)}getChildren(){return this._children[Symbol.iterator]()}getChildIndex(t){return this._children.getNodeIndex(t)}getChildStartOffset(t){return this._children.getNodeStartOffset(t)}getPath(){return[]}getNodeByPath(t){let e=this;for(const n of t)e=e.getChild(e.offsetToIndex(n));return e}offsetToIndex(t){return this._children.offsetToIndex(t)}toJSON(){const t=[];for(const e of this._children)t.push(e.toJSON());return t}static fromJSON(t){const e=[];for(const n of t)n.name?e.push(Ls.fromJSON(n)):e.push(Bs.fromJSON(n));return new Wa(e)}_appendChild(t){this._insertChild(this.childCount,t)}_insertChild(t,e){const n=function(t){if("string"==typeof t)return[new Bs(t)];uo(t)||(t=[t]);return Array.from(t).map(t=>"string"==typeof t?new Bs(t):t instanceof Fs?new Bs(t.data,t.getAttributes()):t)}(e);for(const t of n)null!==t.parent&&t._remove(),t.parent=this;this._children._insertNodes(t,n)}_removeChildren(t,e=1){const n=this._children._removeNodes(t,e);for(const t of n)t.parent=null;return n}}function $a(t,e){const n=(e=Ja(e)).reduce((t,e)=>t+e.offsetSize,0),o=t.parent;Xa(t);const i=t.index;return o._insertChild(i,e),Qa(o,i+e.length),Qa(o,i),new Us(t,t.getShiftedBy(n))}function Ka(t){if(!t.isFlat)throw new T.b("operation-utils-remove-range-not-flat: Trying to remove a range which starts and ends in different element.");const e=t.start.parent;Xa(t.start),Xa(t.end);const n=e._removeChildren(t.start.index,t.end.index-t.start.index);return Qa(e,t.start.index),n}function Ga(t,e){if(!t.isFlat)throw new T.b("operation-utils-move-range-not-flat: Trying to move a range which starts and ends in different element.");const n=Ka(t);return $a(e=e._getTransformedByDeletion(t.start,t.end.offset-t.start.offset),n)}function Ja(t){const e=[];t instanceof Array||(t=[t]);for(let n=0;nt.maxOffset)throw new T.b("move-operation-nodes-do-not-exist: The nodes which should be moved do not exist.");if(t===e&&n=n&&this.targetPosition.path[t]t._clone(!0))),e=new oc(this.position,t,this.baseVersion);return e.shouldReceiveAttributes=this.shouldReceiveAttributes,e}getReversed(){const t=this.position.root.document.graveyard,e=new Hs(t,[0]);return new nc(this.position,this.nodes.maxOffset,e,this.baseVersion+1)}_validate(){const t=this.position.parent;if(!t||t.maxOffsett._clone(!0))),$a(this.position,t)}toJSON(){const t=super.toJSON();return t.position=this.position.toJSON(),t.nodes=this.nodes.toJSON(),t}static get className(){return"InsertOperation"}static fromJSON(t,e){const n=[];for(const e of t.nodes)e.name?n.push(Ls.fromJSON(e)):n.push(Bs.fromJSON(e));const o=new oc(Hs.fromJSON(t.position,e),n,t.baseVersion);return o.shouldReceiveAttributes=t.shouldReceiveAttributes,o}}class ic extends Ua{constructor(t,e,n,o,i,r){super(r),this.name=t,this.oldRange=e?e.clone():null,this.newRange=n?n.clone():null,this.affectsData=i,this._markers=o}get type(){return"marker"}clone(){return new ic(this.name,this.oldRange,this.newRange,this._markers,this.affectsData,this.baseVersion)}getReversed(){return new ic(this.name,this.newRange,this.oldRange,this._markers,this.affectsData,this.baseVersion+1)}_execute(){const t=this.newRange?"_set":"_remove";this._markers[t](this.name,this.newRange,!0,this.affectsData)}toJSON(){const t=super.toJSON();return this.oldRange&&(t.oldRange=this.oldRange.toJSON()),this.newRange&&(t.newRange=this.newRange.toJSON()),delete t._markers,t}static get className(){return"MarkerOperation"}static fromJSON(t,e){return new ic(t.name,t.oldRange?Us.fromJSON(t.oldRange,e):null,t.newRange?Us.fromJSON(t.newRange,e):null,e.model.markers,t.affectsData,t.baseVersion)}}class rc extends Ua{constructor(t,e,n,o){super(o),this.position=t,this.position.stickiness="toNext",this.oldName=e,this.newName=n}get type(){return"rename"}clone(){return new rc(this.position.clone(),this.oldName,this.newName,this.baseVersion)}getReversed(){return new rc(this.position.clone(),this.newName,this.oldName,this.baseVersion+1)}_validate(){const t=this.position.nodeAfter;if(!(t instanceof Ls))throw new T.b("rename-operation-wrong-position: Given position is invalid or node after it is not an instance of Element.");if(t.name!==this.oldName)throw new T.b("rename-operation-wrong-name: Element to change has different name than operation's old name.")}_execute(){this.position.nodeAfter.name=this.newName}toJSON(){const t=super.toJSON();return t.position=this.position.toJSON(),t}static get className(){return"RenameOperation"}static fromJSON(t,e){return new rc(Hs.fromJSON(t.position,e),t.oldName,t.newName,t.baseVersion)}}class sc extends Ua{constructor(t,e,n,o,i){super(i),this.root=t,this.key=e,this.oldValue=n,this.newValue=o}get type(){return null===this.oldValue?"addRootAttribute":null===this.newValue?"removeRootAttribute":"changeRootAttribute"}clone(){return new sc(this.root,this.key,this.oldValue,this.newValue,this.baseVersion)}getReversed(){return new sc(this.root,this.key,this.newValue,this.oldValue,this.baseVersion+1)}_validate(){if(this.root!=this.root.root||this.root.is("documentFragment"))throw new T.b("rootattribute-operation-not-a-root: The element to change is not a root element.",{root:this.root,key:this.key});if(null!==this.oldValue&&this.root.getAttribute(this.key)!==this.oldValue)throw new T.b("rootattribute-operation-wrong-old-value: Changed node has different attribute value than operation's old attribute value.",{root:this.root,key:this.key});if(null===this.oldValue&&null!==this.newValue&&this.root.hasAttribute(this.key))throw new T.b("rootattribute-operation-attribute-exists: The attribute with given key already exists.",{root:this.root,key:this.key})}_execute(){null!==this.newValue?this.root._setAttribute(this.key,this.newValue):this.root._removeAttribute(this.key)}toJSON(){const t=super.toJSON();return t.root=this.root.toJSON(),t}static get className(){return"RootAttributeOperation"}static fromJSON(t,e){if(!e.getRoot(t.root))throw new T.b("rootattribute-operation-fromjson-no-root: Cannot create RootAttributeOperation. Root with specified name does not exist.",{rootName:t.root});return new sc(e.getRoot(t.root),t.key,t.oldValue,t.newValue,t.baseVersion)}}class ac extends Ua{constructor(t,e,n,o,i){super(i),this.sourcePosition=t.clone(),this.sourcePosition.stickiness="toPrevious",this.howMany=e,this.targetPosition=n.clone(),this.targetPosition.stickiness="toNext",this.graveyardPosition=o.clone()}get type(){return"merge"}get deletionPosition(){return new Hs(this.sourcePosition.root,this.sourcePosition.path.slice(0,-1))}get movedRange(){const t=this.sourcePosition.getShiftedBy(Number.POSITIVE_INFINITY);return new Us(this.sourcePosition,t)}clone(){return new this.constructor(this.sourcePosition,this.howMany,this.targetPosition,this.graveyardPosition,this.baseVersion)}getReversed(){const t=this.targetPosition._getTransformedByMergeOperation(this),e=this.sourcePosition.path.slice(0,-1),n=new Hs(this.sourcePosition.root,e)._getTransformedByMergeOperation(this),o=new cc(t,this.howMany,this.graveyardPosition,this.baseVersion+1);return o.insertionPosition=n,o}_validate(){const t=this.sourcePosition.parent,e=this.targetPosition.parent;if(!(t&&t.is("element")&&t.parent))throw new T.b("merge-operation-source-position-invalid: Merge source position is invalid.");if(!(e&&e.is("element")&&e.parent))throw new T.b("merge-operation-target-position-invalid: Merge target position is invalid.");if(this.howMany!=t.maxOffset)throw new T.b("merge-operation-how-many-invalid: Merge operation specifies wrong number of nodes to move.")}_execute(){const t=this.sourcePosition.parent;Ga(Us._createIn(t),this.targetPosition),Ga(Us._createOn(t),this.graveyardPosition)}toJSON(){const t=super.toJSON();return t.sourcePosition=t.sourcePosition.toJSON(),t.targetPosition=t.targetPosition.toJSON(),t.graveyardPosition=t.graveyardPosition.toJSON(),t}static get className(){return"MergeOperation"}static fromJSON(t,e){const n=Hs.fromJSON(t.sourcePosition,e),o=Hs.fromJSON(t.targetPosition,e),i=Hs.fromJSON(t.graveyardPosition,e);return new this(n,t.howMany,o,i,t.baseVersion)}}class cc extends Ua{constructor(t,e,n,o){super(o),this.splitPosition=t.clone(),this.splitPosition.stickiness="toNext",this.howMany=e,this.insertionPosition=cc.getInsertionPosition(t),this.insertionPosition.stickiness="toNone",this.graveyardPosition=n?n.clone():null,this.graveyardPosition&&(this.graveyardPosition.stickiness="toNext")}get type(){return"split"}get moveTargetPosition(){const t=this.insertionPosition.path.slice();return t.push(0),new Hs(this.insertionPosition.root,t)}get movedRange(){const t=this.splitPosition.getShiftedBy(Number.POSITIVE_INFINITY);return new Us(this.splitPosition,t)}clone(){const t=new this.constructor(this.splitPosition,this.howMany,this.graveyardPosition,this.baseVersion);return t.insertionPosition=this.insertionPosition,t}getReversed(){const t=this.splitPosition.root.document.graveyard,e=new Hs(t,[0]);return new ac(this.moveTargetPosition,this.howMany,this.splitPosition,e,this.baseVersion+1)}_validate(){const t=this.splitPosition.parent,e=this.splitPosition.offset;if(!t||t.maxOffset{for(const e of t.getAttributeKeys())this.removeAttribute(e,t)};if(t instanceof Us)for(const n of t.getItems())e(n);else e(t)}move(t,e,n){if(this._assertWriterUsedCorrectly(),!(t instanceof Us))throw new T.b("writer-move-invalid-range: Invalid range to move.");if(!t.isFlat)throw new T.b("writer-move-range-not-flat: Range to move is not flat.");const o=Hs._createAt(e,n);if(!gc(t.root,o.root))throw new T.b("writer-move-different-document: Range is going to be moved between different documents.");const i=t.root.document?t.root.document.version:null,r=new nc(t.start,t.end.offset-t.start.offset,o,i);this.batch.addOperation(r),this.model.applyOperation(r)}remove(t){if(this._assertWriterUsedCorrectly(),t instanceof Us){const e=t.getMinimalFlatRanges().reverse();for(const t of e)pc(t.start,t.end.offset-t.start.offset,this.batch,this.model)}else{const e=t.is("text")?t.offsetSize:1;pc(Hs._createBefore(t),e,this.batch,this.model)}}merge(t){this._assertWriterUsedCorrectly();const e=t.nodeBefore,n=t.nodeAfter;if(!(e instanceof Ls))throw new T.b("writer-merge-no-element-before: Node before merge position must be an element.");if(!(n instanceof Ls))throw new T.b("writer-merge-no-element-after: Node after merge position must be an element.");t.root.document?this._merge(t):this._mergeDetached(t)}createPositionFromPath(t,e,n){return this.model.createPositionFromPath(t,e,n)}createPositionAt(t,e){return this.model.createPositionAt(t,e)}createPositionAfter(t){return this.model.createPositionAfter(t)}createPositionBefore(t){return this.model.createPositionBefore(t)}createRange(t,e){return this.model.createRange(t,e)}createRangeIn(t){return this.model.createRangeIn(t)}createRangeOn(t){return this.model.createRangeOn(t)}createSelection(t,e,n){return this.model.createSelection(t,e,n)}_mergeDetached(t){const e=t.nodeBefore,n=t.nodeAfter;this.move(Us._createIn(n),Hs._createAt(e,"end")),this.remove(n)}_merge(t){const e=Hs._createAt(t.nodeBefore,"end"),n=Hs._createAt(t.nodeAfter,0),o=t.root.document.graveyard,i=new Hs(o,[0]),r=t.root.document.version,s=new ac(n,t.nodeAfter.maxOffset,e,i,r);this.batch.addOperation(s),this.model.applyOperation(s)}rename(t,e){if(this._assertWriterUsedCorrectly(),!(t instanceof Ls))throw new T.b("writer-rename-not-element-instance: Trying to rename an object which is not an instance of Element.");const n=t.root.document?t.root.document.version:null,o=new rc(Hs._createBefore(t),t.name,e,n);this.batch.addOperation(o),this.model.applyOperation(o)}split(t,e){this._assertWriterUsedCorrectly();let n,o,i=t.parent;if(!i.parent)throw new T.b("writer-split-element-no-parent: Element with no parent can not be split.");if(e||(e=i.parent),!t.parent.getAncestors({includeSelf:!0}).includes(e))throw new T.b("writer-split-invalid-limit-element: Limit element is not a position ancestor.");do{const e=i.root.document?i.root.document.version:null,r=i.maxOffset-t.offset,s=new cc(t,r,null,e);this.batch.addOperation(s),this.model.applyOperation(s),n||o||(n=i,o=t.parent.nextSibling),i=(t=this.createPositionAfter(t.parent)).parent}while(i!==e);return{position:t,range:new Us(Hs._createAt(n,"end"),Hs._createAt(o,0))}}wrap(t,e){if(this._assertWriterUsedCorrectly(),!t.isFlat)throw new T.b("writer-wrap-range-not-flat: Range to wrap is not flat.");const n=e instanceof Ls?e:new Ls(e);if(n.childCount>0)throw new T.b("writer-wrap-element-not-empty: Element to wrap with is not empty.");if(null!==n.parent)throw new T.b("writer-wrap-element-attached: Element to wrap with is already attached to tree model.");const o=t.root.document?t.root.document.version:null,i=new oc(t.start,n,o);this.batch.addOperation(i),this.model.applyOperation(i);const r=new nc(t.start.getShiftedBy(1),t.end.offset-t.start.offset,Hs._createAt(n,0),null===o?null:o+1);this.batch.addOperation(r),this.model.applyOperation(r)}unwrap(t){if(this._assertWriterUsedCorrectly(),null===t.parent)throw new T.b("writer-unwrap-element-no-parent: Trying to unwrap an element which has no parent.");this.move(Us._createIn(t),this.createPositionAfter(t)),this.remove(t)}addMarker(t,e){if(this._assertWriterUsedCorrectly(),!e||"boolean"!=typeof e.usingOperation)throw new T.b("writer-addMarker-no-usingOperations: The options.usingOperations parameter is required when adding a new marker.");const n=e.usingOperation,o=e.range,i=void 0!==e.affectsData&&e.affectsData;if(this.model.markers.has(t))throw new T.b("writer-addMarker-marker-exists: Marker with provided name already exists.");if(!o)throw new T.b("writer-addMarker-no-range: Range parameter is required when adding a new marker.");return n?(fc(this,t,null,o,i),this.model.markers.get(t)):this.model.markers._set(t,o,n,i)}updateMarker(t,e={}){this._assertWriterUsedCorrectly();const n="string"==typeof t?t:t.name,o=this.model.markers.get(n);if(!o)throw new T.b("writer-updateMarker-marker-not-exists: Marker with provided name does not exists.");const i="boolean"==typeof e.usingOperation,r="boolean"==typeof e.affectsData,s=r?e.affectsData:o.affectsData;if(!i&&!e.range&&!r)throw new T.b("writer-updateMarker-wrong-options: One of the options is required - provide range, usingOperations or affectsData.");const a=o.getRange(),c=e.range?e.range:a;i&&e.usingOperation!==o.managedUsingOperations?e.usingOperation?fc(this,n,null,c,s):(fc(this,n,a,null,s),this.model.markers._set(n,c,void 0,s)):o.managedUsingOperations?fc(this,n,a,c,s):this.model.markers._set(n,c,void 0,s)}removeMarker(t){this._assertWriterUsedCorrectly();const e="string"==typeof t?t:t.name;if(!this.model.markers.has(e))throw new T.b("writer-removeMarker-no-marker: Trying to remove marker which does not exist.");const n=this.model.markers.get(e);n.managedUsingOperations?fc(this,e,n.getRange(),null,n.affectsData):this.model.markers._remove(e)}setSelection(t,e,n){this._assertWriterUsedCorrectly(),this.model.document.selection._setTo(t,e,n)}setSelectionFocus(t,e){this._assertWriterUsedCorrectly(),this.model.document.selection._setFocus(t,e)}setSelectionAttribute(t,e){if(this._assertWriterUsedCorrectly(),"string"==typeof t)this._setSelectionAttribute(t,e);else for(const[e,n]of Ms(t))this._setSelectionAttribute(e,n)}removeSelectionAttribute(t){if(this._assertWriterUsedCorrectly(),"string"==typeof t)this._removeSelectionAttribute(t);else for(const e of t)this._removeSelectionAttribute(e)}overrideSelectionGravity(){return this.model.document.selection._overrideGravity()}restoreSelectionGravity(t){this.model.document.selection._restoreGravity(t)}_setSelectionAttribute(t,e){const n=this.model.document.selection;if(n.isCollapsed&&n.anchor.parent.isEmpty){const o=ea._getStoreAttributeKey(t);this.setAttribute(o,e,n.anchor.parent)}n._setAttribute(t,e)}_removeSelectionAttribute(t){const e=this.model.document.selection;if(e.isCollapsed&&e.anchor.parent.isEmpty){const n=ea._getStoreAttributeKey(t);this.removeAttribute(n,e.anchor.parent)}e._removeAttribute(t)}_assertWriterUsedCorrectly(){if(this.model._currentWriter!==this)throw new T.b("writer-incorrect-use: Trying to use a writer outside the change() block.")}}function hc(t,e,n,o){const i=t.model,r=i.document;let s,a,c,l=o.start;for(const t of o.getWalker({shallow:!0}))c=t.item.getAttribute(e),s&&a!=c&&(a!=n&&d(),l=s),s=t.nextPosition,a=c;function d(){const o=new Us(l,s),c=o.root.document?r.version:null,d=new tc(o,e,a,n,c);t.batch.addOperation(d),i.applyOperation(d)}s instanceof Hs&&s!=l&&a!=n&&d()}function uc(t,e,n,o){const i=t.model,r=i.document,s=o.getAttribute(e);let a,c;if(s!=n){if(o.root===o){const t=o.document?r.version:null;c=new sc(o,e,s,n,t)}else{const i=(a=new Us(Hs._createBefore(o),t.createPositionAfter(o))).root.document?r.version:null;c=new tc(a,e,s,n,i)}t.batch.addOperation(c),i.applyOperation(c)}}function fc(t,e,n,o,i){const r=t.model,s=r.document,a=new ic(e,n,o,r.markers,i,s.version);t.batch.addOperation(a),r.applyOperation(a)}function pc(t,e,n,o){let i;if(t.root.document){const n=o.document,r=new Hs(n.graveyard,[0]);i=new nc(t,e,r,n.version)}else i=new ec(t,e);n.addOperation(i),o.applyOperation(i)}function gc(t,e){return t===e||t instanceof lc&&e instanceof lc}class mc{constructor(t){this._markerCollection=t,this._changesInElement=new Map,this._elementSnapshots=new Map,this._changedMarkers=new Map,this._changeCount=0,this._cachedChanges=null,this._cachedChangesWithGraveyard=null}get isEmpty(){return 0==this._changesInElement.size&&0==this._changedMarkers.size}bufferOperation(t){switch(t.type){case"insert":if(this._isInInsertedElement(t.position.parent))return;this._markInsert(t.position.parent,t.position.offset,t.nodes.maxOffset);break;case"addAttribute":case"removeAttribute":case"changeAttribute":for(const e of t.range.getItems())this._isInInsertedElement(e.parent)||this._markAttribute(e);break;case"remove":case"move":case"reinsert":{const e=this._isInInsertedElement(t.sourcePosition.parent),n=this._isInInsertedElement(t.targetPosition.parent);e||this._markRemove(t.sourcePosition.parent,t.sourcePosition.offset,t.howMany),n||this._markInsert(t.targetPosition.parent,t.getMovedRangeStart().offset,t.howMany);break}case"rename":{if(this._isInInsertedElement(t.position.parent))return;this._markRemove(t.position.parent,t.position.offset,1),this._markInsert(t.position.parent,t.position.offset,1);const e=Us._createFromPositionAndShift(t.position,1);for(const t of this._markerCollection.getMarkersIntersectingRange(e)){const e=t.getRange();this.bufferMarkerChange(t.name,e,e,t.affectsData)}break}case"split":{const e=t.splitPosition.parent;this._isInInsertedElement(e)||this._markRemove(e,t.splitPosition.offset,t.howMany),this._isInInsertedElement(t.insertionPosition.parent)||this._markInsert(t.insertionPosition.parent,t.insertionPosition.offset,1),t.graveyardPosition&&this._markRemove(t.graveyardPosition.parent,t.graveyardPosition.offset,1);break}case"merge":{const e=t.sourcePosition.parent;this._isInInsertedElement(e.parent)||this._markRemove(e.parent,e.startOffset,1);const n=t.graveyardPosition.parent;this._markInsert(n,t.graveyardPosition.offset,1);const o=t.targetPosition.parent;this._isInInsertedElement(o)||this._markInsert(o,t.targetPosition.offset,e.maxOffset);break}}this._cachedChanges=null}bufferMarkerChange(t,e,n,o){const i=this._changedMarkers.get(t);i?(i.newRange=n,i.affectsData=o,null==i.oldRange&&null==i.newRange&&this._changedMarkers.delete(t)):this._changedMarkers.set(t,{oldRange:e,newRange:n,affectsData:o})}getMarkersToRemove(){const t=[];for(const[e,n]of this._changedMarkers)null!=n.oldRange&&t.push({name:e,range:n.oldRange});return t}getMarkersToAdd(){const t=[];for(const[e,n]of this._changedMarkers)null!=n.newRange&&t.push({name:e,range:n.newRange});return t}hasDataChanges(){for(const[,t]of this._changedMarkers)if(t.affectsData)return!0;return this._changesInElement.size>0}getChanges(t={includeChangesInGraveyard:!1}){if(this._cachedChanges)return t.includeChangesInGraveyard?this._cachedChangesWithGraveyard.slice():this._cachedChanges.slice();const e=[];for(const t of this._changesInElement.keys()){const n=this._changesInElement.get(t).sort((t,e)=>t.offset===e.offset?t.type!=e.type?"remove"==t.type?-1:1:0:t.offsett.position.root!=e.position.root?t.position.root.rootNamen.offset){if(o>i){const t={type:"attribute",offset:i,howMany:o-i,count:this._changeCount++};this._handleChange(t,e),e.push(t)}t.nodesToHandle=n.offset-t.offset,t.howMany=t.nodesToHandle}else t.offset>=n.offset&&t.offseti?(t.nodesToHandle=o-i,t.offset=i):t.nodesToHandle=0);"attribute"==n.type&&(t.offset>=n.offset&&o<=i?(t.nodesToHandle=0,t.howMany=0,t.offset=0):t.offset<=n.offset&&o>=i&&(n.howMany=0))}}t.howMany=t.nodesToHandle,delete t.nodesToHandle}_getInsertDiff(t,e,n){return{type:"insert",position:Hs._createAt(t,e),name:n,length:1,changeCount:this._changeCount++}}_getRemoveDiff(t,e,n){return{type:"remove",position:Hs._createAt(t,e),name:n,length:1,changeCount:this._changeCount++}}_getAttributesDiff(t,e,n){const o=[];n=new Map(n);for(const[i,r]of e){const e=n.has(i)?n.get(i):null;e!==r&&o.push({type:"attribute",position:t.start,range:t.clone(),length:1,attributeKey:i,attributeOldValue:r,attributeNewValue:e,changeCount:this._changeCount++}),n.delete(i)}for(const[e,i]of n)o.push({type:"attribute",position:t.start,range:t.clone(),length:1,attributeKey:e,attributeOldValue:null,attributeNewValue:i,changeCount:this._changeCount++});return o}_isInInsertedElement(t){const e=t.parent;if(!e)return!1;const n=this._changesInElement.get(e),o=t.startOffset;if(n)for(const t of n)if("insert"==t.type&&o>=t.offset&&oo&&(n.push(..."e".repeat(t.offset-o).split("")),i+=t.offset-o),"insert"==t.type?(n.push(..."i".repeat(t.howMany).split("")),o=t.offset+t.howMany):"remove"==t.type?(n.push(..."r".repeat(t.howMany).split("")),o=t.offset,i+=t.howMany):(n.push(..."a".repeat(t.howMany).split("")),o=t.offset+t.howMany,i+=t.howMany);return i{const n=e[0];if(n.isDocumentOperation&&n.baseVersion!==this.version)throw new T.b("model-document-applyOperation-wrong-version: Only operations with matching versions can be applied.",{operation:n})},{priority:"highest"}),this.listenTo(t,"applyOperation",(t,e)=>{const n=e[0];n.isDocumentOperation&&this.differ.bufferOperation(n)},{priority:"high"}),this.listenTo(t,"applyOperation",(t,e)=>{const n=e[0];n.isDocumentOperation&&(this.version++,this.history.addOperation(n))},{priority:"low"});let e=!1;this.listenTo(this.selection,"change",()=>{e=!0}),this.listenTo(t,"_change",(t,n)=>{this.differ.isEmpty&&!e||(this._callPostFixers(n),this.differ.hasDataChanges()?this.fire("change:data",n.batch):this.fire("change",n.batch),this.differ.reset(),e=!1)}),this.listenTo(t.markers,"update",(t,e,n,o)=>{this.differ.bufferMarkerChange(e.name,n,o,e.affectsData),null===n&&e.on("change",(t,n)=>{this.differ.bufferMarkerChange(e.name,n,e.getRange(),e.affectsData)})})}get graveyard(){return this.getRoot(xc)}createRoot(t="$root",e="main"){if(this.roots.get(e))throw new T.b("model-document-createRoot-name-exists: Root with specified name already exists.",{name:e});const n=new lc(this,t,e);return this.roots.add(n),n}destroy(){this.selection.destroy(),this.stopListening()}getRoot(t="main"){return this.roots.get(t)}getRootNames(){return Array.from(this.roots,t=>t.rootName).filter(t=>t!=xc)}registerPostFixer(t){this._postFixers.add(t)}toJSON(){const t=so(this);return t.selection="[engine.model.DocumentSelection]",t.model="[engine.model.Model]",t}_getDefaultRoot(){for(const t of this.roots)if(t!==this.graveyard)return t;return this.graveyard}_getDefaultRange(){const t=this._getDefaultRoot(),e=this.model,n=e.schema,o=e.createPositionFromPath(t,[0]);return n.getNearestSelectionRange(o)||e.createRange(o)}_validateSelectionRange(t){return Cc(t.start)&&Cc(t.end)}_callPostFixers(t){let e=!1;do{for(const n of this._postFixers)if(e=n(t))break}while(e)}}function Cc(t){const e=t.textNode;if(e){const n=e.data,o=t.offset-e.startOffset;return!kc(n,o)&&!yc(n,o)}return!0}j(Ac,M);class Pc{constructor(){this._markers=new Map}[Symbol.iterator](){return this._markers.values()}has(t){return this._markers.has(t)}get(t){return this._markers.get(t)||null}_set(t,e,n=!1,o=!1){const i=t instanceof Tc?t.name:t,r=this._markers.get(i);if(r){const t=r.getRange();let s=!1;return t.isEqual(e)||(r._attachLiveRange(Zs.fromRange(e)),s=!0),n!=r.managedUsingOperations&&(r._managedUsingOperations=n,s=!0),"boolean"==typeof o&&o!=r.affectsData&&(r._affectsData=o,s=!0),s&&this.fire("update:"+i,r,t,e),r}const s=Zs.fromRange(e),a=new Tc(i,s,n,o);return this._markers.set(i,a),this.fire("update:"+i,a,null,e),a}_remove(t){const e=t instanceof Tc?t.name:t,n=this._markers.get(e);return!!n&&(this._markers.delete(e),this.fire("update:"+e,n,n.getRange(),null),this._destroyMarker(n),!0)}*getMarkersAtPosition(t){for(const e of this)e.getRange().containsPosition(t)&&(yield e)}*getMarkersIntersectingRange(t){for(const e of this)null!==e.getRange().getIntersection(t)&&(yield e)}destroy(){for(const t of this._markers.values())this._destroyMarker(t);this._markers=null,this.stopListening()}*getMarkersGroup(t){for(const e of this._markers.values())e.name.startsWith(t+":")&&(yield e)}_destroyMarker(t){t.stopListening(),t._detachLiveRange()}}j(Pc,M);class Tc{constructor(t,e,n,o){this.name=t,this._liveRange=this._attachLiveRange(e),this._managedUsingOperations=n,this._affectsData=o}get managedUsingOperations(){if(!this._liveRange)throw new T.b("marker-destroyed: Cannot use a destroyed marker instance.");return this._managedUsingOperations}get affectsData(){if(!this._liveRange)throw new T.b("marker-destroyed: Cannot use a destroyed marker instance.");return this._affectsData}getStart(){if(!this._liveRange)throw new T.b("marker-destroyed: Cannot use a destroyed marker instance.");return this._liveRange.start.clone()}getEnd(){if(!this._liveRange)throw new T.b("marker-destroyed: Cannot use a destroyed marker instance.");return this._liveRange.end.clone()}getRange(){if(!this._liveRange)throw new T.b("marker-destroyed: Cannot use a destroyed marker instance.");return this._liveRange.toRange()}_attachLiveRange(t){return this._liveRange&&this._detachLiveRange(),t.delegate("change:range").to(this),t.delegate("change:content").to(this),this._liveRange=t,t}_detachLiveRange(){this._liveRange.stopDelegating("change:range",this),this._liveRange.stopDelegating("change:content",this),this._liveRange.detach(),this._liveRange=null}}j(Tc,M);class Sc extends Hs{constructor(t,e,n="toNone"){if(super(t,e,n),!this.root.is("rootElement"))throw new T.b("model-liveposition-root-not-rootelement: LivePosition's root has to be an instance of RootElement.");(function(){this.listenTo(this.root.document.model,"applyOperation",(t,e)=>{const n=e[0];n.isDocumentOperation&&function(t){const e=this.getTransformedByOperation(t);if(!this.isEqual(e)){const t=this.toPosition();this.path=e.path,this.root=e.root,this.fire("change",t)}}.call(this,n)},{priority:"low"})}).call(this)}detach(){this.stopListening()}toPosition(){return new Hs(this.root,this.path.slice(),this.stickiness)}static fromPosition(t,e){return new this(t.root,t.path.slice(),e||t.stickiness)}}j(Sc,M);class Ec{constructor(t,e,n){this.model=t,this.writer=e,this.position=n,this.canMergeWith=new Set([this.position.parent]),this.schema=t.schema,this._filterAttributesOf=[]}handleNodes(t,e){t=Array.from(t);for(let n=0;n{if(!n.doNotResetEntireContent&&function(t,e){const n=t.getLimitElement(e);if(!e.containsEntireContent(n))return!1;const o=e.getFirstRange();if(o.start.parent==o.end.parent)return!1;return t.checkChild(n,"paragraph")}(o,e))return void function(t,e){const n=t.model.schema.getLimitElement(e);t.remove(t.createRangeIn(n)),Oc(t,t.createPositionAt(n,0),e)}(t,e);const i=e.getFirstRange(),r=i.start,s=Sc.fromPosition(i.end,"toNext");i.start.isTouching(i.end)||t.remove(i),n.leaveUnmerged||(!function t(e,n,o){const i=n.parent;const r=o.parent;if(i==r)return;if(e.model.schema.isLimit(i)||e.model.schema.isLimit(r))return;if(!function(t,e,n){const o=new Us(t,e);for(const t of o.getWalker())if(n.isLimit(t.item))return!1;return!0}(n,o,e.model.schema))return;n=e.createPositionAfter(i);o=e.createPositionBefore(r);o.isEqual(n)||e.insert(r,n);e.merge(n);for(;o.parent.isEmpty;){const t=o.parent;o=e.createPositionBefore(t),e.remove(t)}t(e,n,o)}(t,r,s),o.removeDisallowedAttributes(r.parent.getChildren(),t)),e instanceof ea?t.setSelection(r):e.setTo(r),function(t,e){const n=t.checkChild(e,"$text"),o=t.checkChild(e,"paragraph");return!n&&o}(o,r)&&Oc(t,r,e),s.detach()})}function Oc(t,e,n){const o=t.createElement("paragraph");t.insert(o,e),n instanceof ea?t.setSelection(o,0):n.setTo(o,0)}const Ic=' ,.?!:;"-()';function Vc(t,e,n={}){const o=t.schema,i="backward"!=n.direction,r=n.unit?n.unit:"character",s=e.focus,a=new zs({boundaries:function(t,e){const n=t.root,o=Hs._createAt(n,e?"end":0);return e?new Us(t,o):new Us(o,t)}(s,i),singleCharacters:!0,direction:i?"forward":"backward"}),c={walker:a,schema:o,isForward:i,unit:r};let l;for(;l=a.next();){if(l.done)return;const n=Mc(c,l.value);if(n)return void(e instanceof ea?t.change(t=>{t.setSelectionFocus(n)}):e.setFocus(n))}}function Mc(t,e){if("text"==e.type)return"word"===t.unit?function(t,e){let n=t.position.textNode;if(n){let o=t.position.offset-n.startOffset;for(;!Nc(n.data,o,e)&&!Bc(n,o,e);){t.next();const i=e?t.position.nodeAfter:t.position.nodeBefore;if(i&&i.is("text")){const o=i.data.charAt(e?0:i.data.length-1);Ic.includes(o)||(t.next(),n=t.position.textNode)}o=t.position.offset-n.startOffset}}return t.position}(t.walker,t.isForward):function(t,e){const n=t.position.textNode;if(n){const o=n.data;let i=t.position.offset-n.startOffset;for(;kc(o,i)||"character"==e&&yc(o,i);)t.next(),i=t.position.offset-n.startOffset}return t.position}(t.walker,t.unit,t.isForward);if(e.type==(t.isForward?"elementStart":"elementEnd")){if(t.schema.isObject(e.item))return Hs._createAt(e.item,t.isForward?"after":"before");if(t.schema.checkChild(e.nextPosition,"$text"))return e.nextPosition}else{if(t.schema.isLimit(e.item))return void t.walker.skip(()=>!0);if(t.schema.checkChild(e.nextPosition,"$text"))return e.nextPosition}}function Nc(t,e,n){const o=e+(n?0:-1);return Ic.includes(t.charAt(o))}function Bc(t,e,n){return e===(n?t.endOffset:0)}function Fc(t,e){const n=[];Array.from(t.getItems({direction:"backward"})).map(t=>e.createRangeOn(t)).filter(e=>{return(e.start.isAfter(t.start)||e.start.isEqual(t.start))&&(e.end.isBefore(t.end)||e.end.isEqual(t.end))}).forEach(t=>{n.push(t.start.parent),e.remove(t)}),n.forEach(t=>{let n=t;for(;n.parent&&n.isEmpty;){const t=e.createRangeOn(n);n=n.parent,e.remove(t)}})}function Dc(t){t.document.registerPostFixer(e=>(function(t,e){const n=e.document.selection,o=e.schema,i=[];let r=!1;for(const t of n.getRanges()){const e=Lc(t,o);e?(i.push(e),r=!0):i.push(t)}if(r){let e=i;if(i.length>1){const t=i[0].start,n=i[i.length-1].end;e=[new Us(t,n)]}t.setSelection(e,{backward:n.isBackward})}})(e,t))}function Lc(t,e){return t.isCollapsed?function(t,e){const n=t.start,o=e.getNearestSelectionRange(n);if(!o)return null;const i=o.start;if(n.isEqual(i))return null;if(i.nodeAfter&&e.isLimit(i.nodeAfter))return new Us(i,Hs._createAfter(i.nodeAfter));return new Us(i)}(t,e):function(t,e){const n=t.start,o=t.end,i=e.checkChild(n,"$text"),r=e.checkChild(o,"$text"),s=e.getLimitElement(n),a=e.getLimitElement(o);if(s===a){if(i&&r)return null;if(function(t,e,n){const o=t.nodeAfter&&!n.isLimit(t.nodeAfter)||n.checkChild(t,"$text"),i=e.nodeBefore&&!n.isLimit(e.nodeBefore)||n.checkChild(e,"$text");return o&&i}(n,o,e)){const t=e.getNearestSelectionRange(n,"forward"),i=e.getNearestSelectionRange(o,"backward");return new Us(t?t.start:n,i?i.start:o)}}const c=s&&!s.is("rootElement"),l=a&&!a.is("rootElement");if(c||l){const t=Hs._createAt(s,0),i=Hs._createAt(a,0),r=c?zc(t,e,"start"):n,d=l?zc(i,e,"end"):o;return new Us(r,d)}return null}(t,e)}function zc(t,e,n){let o=t.parent,i=o;for(;e.isLimit(i)&&i.parent;)o=i,i=i.parent;return"start"===n?Hs._createBefore(o):Hs._createAfter(o)}class jc{constructor(){this.markers=new Pc,this.document=new Ac(this),this.schema=new va,this._pendingChanges=[],this._currentWriter=null,["insertContent","deleteContent","modifySelection","getSelectedContent","applyOperation"].forEach(t=>this.decorate(t)),this.on("applyOperation",(t,e)=>{e[0]._validate()},{priority:"highest"}),this.schema.register("$root",{isLimit:!0}),this.schema.register("$block",{allowIn:"$root",isBlock:!0}),this.schema.register("$text",{allowIn:"$block"}),this.schema.register("$clipboardHolder",{allowContentOf:"$root",isLimit:!0}),this.schema.extend("$text",{allowIn:"$clipboardHolder"}),this.schema.register("$marker",{allowIn:["$root","$block"]}),Dc(this)}change(t){return 0===this._pendingChanges.length?(this._pendingChanges.push({batch:new Ha,callback:t}),this._runPendingChanges()[0]):t(this._currentWriter)}enqueueChange(t,e){"string"==typeof t?t=new Ha(t):"function"==typeof t&&(e=t,t=new Ha),this._pendingChanges.push({batch:t,callback:e}),1==this._pendingChanges.length&&this._runPendingChanges()}applyOperation(t){t._execute()}insertContent(t,e,n){!function(t,e,n,o){t.change(i=>{let r;(r=n?n instanceof Qs||n instanceof ea?n:i.createSelection(n,o):t.document.selection).isCollapsed||t.deleteContent(r);const s=new Ec(t,i,r.anchor);let a;a=e.is("documentFragment")?e.getChildren():[e],s.handleNodes(a,{isFirst:!0,isLast:!0});const c=s.getSelectionRange();c?r instanceof ea?i.setSelection(c):r.setTo(c):fs.a.warn("insertcontent-no-range: Cannot determine a proper selection range after insertion.")})}(this,t,e,n)}deleteContent(t,e){Rc(this,t,e)}modifySelection(t,e){Vc(this,t,e)}getSelectedContent(t){return function(t,e){return t.change(t=>{const n=t.createDocumentFragment(),o=e.getFirstRange();if(!o||o.isCollapsed)return n;const i=o.start.root,r=o.start.getCommonPath(o.end),s=i.getNodeByPath(r);let a;const c=(a=o.start.parent==o.end.parent?o:t.createRange(t.createPositionAt(s,o.start.path[r.length]),t.createPositionAt(s,o.end.path[r.length]+1))).end.offset-a.start.offset;for(const e of a.getItems({shallow:!0}))e.is("textProxy")?t.appendText(e.data,e.getAttributes(),n):t.append(e._clone(!0),n);if(a!=o){const e=o._getTransformedByMove(a.start,t.createPositionAt(n,0),c)[0],i=t.createRange(t.createPositionAt(n,0),e.start);Fc(t.createRange(e.end,t.createPositionAt(n,"end")),t),Fc(i,t)}return n})}(this,t)}hasContent(t){if(t instanceof Ls&&(t=Us._createIn(t)),t.isCollapsed)return!1;for(const e of t.getItems())if(e.is("textProxy")||this.schema.isObject(e))return!0;return!1}createPositionFromPath(t,e,n){return new Hs(t,e,n)}createPositionAt(t,e){return Hs._createAt(t,e)}createPositionAfter(t){return Hs._createAfter(t)}createPositionBefore(t){return Hs._createBefore(t)}createRange(t,e){return new Us(t,e)}createRangeIn(t){return Us._createIn(t)}createRangeOn(t){return Us._createOn(t)}createSelection(t,e,n){return new Qs(t,e,n)}createBatch(){return new Ha}destroy(){this.document.destroy(),this.stopListening()}_runPendingChanges(){const t=[];for(this.fire("_beforeChanges");this._pendingChanges.length;){const e=this._pendingChanges[0].batch;this._currentWriter=new dc(this,e);const n=this._pendingChanges[0].callback(this._currentWriter);t.push(n),this.fire("_change",this._currentWriter),this._pendingChanges.shift(),this._currentWriter=null}return this.fire("_afterChanges"),t}}j(jc,Fo);class qc{constructor(){this._listener=Object.create(rr)}listenTo(t){this._listener.listenTo(t,"keydown",(t,e)=>{this._listener.fire("_keydown:"+fi(e),e)})}set(t,e,n={}){const o=pi(t),i=n.priority;this._listener.listenTo(this._listener,"_keydown:"+o,(t,n)=>{e(n,()=>{n.preventDefault(),n.stopPropagation(),t.stop()}),t.return=!0},{priority:i})}press(t){return!!this._listener.fire("_keydown:"+fi(t),t)}destroy(){this._listener.stopListening()}}class Hc extends qc{constructor(t){super(),this.editor=t}set(t,e,n={}){if("string"==typeof e){const t=e;e=((e,n)=>{this.editor.execute(t),n()})}super.set(t,e,n)}}n(120);class Uc{constructor(t){const e=this.constructor.builtinPlugins;this.config=new P(t,this.constructor.defaultConfig),this.config.define("plugins",e),this.plugins=new pa(this,e),this.commands=new ga,this.locale=new ba(this.config.get("language")),this.t=this.locale.t,this.set("state","initializing"),this.once("ready",()=>this.state="ready",{priority:"high"}),this.once("destroy",()=>this.state="destroyed",{priority:"high"}),this.set("isReadOnly",!1),this.model=new jc,this.data=new La(this.model),this.editing=new fa(this.model),this.editing.view.document.bind("isReadOnly").to(this),this.conversion=new za,this.conversion.register("downcast",[this.editing.downcastDispatcher,this.data.downcastDispatcher]),this.conversion.register("editingDowncast",[this.editing.downcastDispatcher]),this.conversion.register("dataDowncast",[this.data.downcastDispatcher]),this.conversion.register("upcast",[this.data.upcastDispatcher]),this.keystrokes=new Hc(this),this.keystrokes.listenTo(this.editing.view.document)}initPlugins(){const t=this,e=this.config;return function(){const n=e.get("plugins")||[],o=e.get("removePlugins")||[],i=e.get("extraPlugins")||[];return t.plugins.load(n.concat(i),o)}().then(t=>n(t,"init").then(()=>n(t,"afterInit"))).then(()=>this.fire("pluginsReady"));function n(t,e){return t.reduce((t,n)=>n[e]?t.then(n[e].bind(n)):t,Promise.resolve())}}destroy(){let t=Promise.resolve();return"initializing"==this.state&&(t=new Promise(t=>this.once("ready",t))),t.then(()=>{this.fire("destroy"),this.stopListening(),this.commands.destroy()}).then(()=>this.plugins.destroy()).then(()=>{this.model.destroy(),this.data.destroy(),this.editing.destroy(),this.keystrokes.destroy()})}execute(...t){this.commands.execute(...t)}static create(t){return new Promise(e=>{const n=new this(t);e(n.initPlugins().then(()=>{n.fire("dataReady"),n.fire("ready")}).then(()=>n))})}}j(Uc,Fo);class Wc{getHtml(t){const e=document.implementation.createHTMLDocument("").createElement("div");return e.appendChild(t),e.innerHTML}}class $c{constructor(){this._domParser=new DOMParser,this._domConverter=new er({blockFiller:Ii}),this._htmlWriter=new Wc}toData(t){const e=this._domConverter.viewToDom(t,document);return this._htmlWriter.getHtml(e)}toView(t){const e=this._toDom(t);return this._domConverter.domToView(e)}_toDom(t){const e=this._domParser.parseFromString(t,"text/html"),n=e.createDocumentFragment(),o=e.body.childNodes;for(;o.length>0;)n.appendChild(o[0]);return n}}class Kc{constructor(t){this.editor=t}destroy(){this.stopListening()}}j(Kc,Fo);class Gc extends ti{constructor(t){super({idProperty:"viewUid"}),this.on("add",(t,e,n)=>{e.isRendered||e.render(),e.element&&this._parentElement&&this._parentElement.insertBefore(e.element,this._parentElement.children[n])}),this.on("remove",(t,e)=>{e.element&&this._parentElement&&e.element.remove()}),this.locale=t,this._parentElement=null}destroy(){this.map(t=>t.destroy())}setParent(t){this._parentElement=t}delegate(...t){if(!t.length||!function(t){return t.every(t=>"string"==typeof t)}(t))throw new T.b("ui-viewcollection-delegate-wrong-events: All event names must be strings.");return{to:e=>{for(const n of this)for(const o of t)n.delegate(o).to(e);this.on("add",(n,o)=>{for(const n of t)o.delegate(n).to(e)}),this.on("remove",(n,o)=>{for(const n of t)o.stopDelegating(n,e)})}}}}j(ti,Fo);var Jc=1,Qc=4;var Xc=function(t,e){return io(t,Jc|Qc,e="function"==typeof e?e:void 0)};const Yc="http://www.w3.org/1999/xhtml";class Zc{constructor(t){Object.assign(this,cl(al(t))),this._isRendered=!1,this._revertData=null}render(){const t=this._renderNode({intoFragment:!0});return this._isRendered=!0,t}apply(t){return this._revertData={children:[],bindings:[],attributes:{}},this._renderNode({node:t,isApplying:!0,revertData:this._revertData}),t}revert(t){if(!this._revertData)throw new T.b("ui-template-revert-not-applied: Attempting to revert a template which has not been applied yet.");this._revertTemplateFromNode(t,this._revertData)}*getViews(){yield*function*t(e){if(e.children)for(const n of e.children)fl(n)?yield n:pl(n)&&(yield*t(n))}(this)}static bind(t,e){return{to:(n,o)=>new el({eventNameOrFunction:n,attribute:n,observable:t,emitter:e,callback:o}),if:(n,o,i)=>new nl({observable:t,emitter:e,attribute:n,valueIfTrue:o,callback:i})}}static extend(t,e){t._isRendered&&fs.a.warn("template-extend-render: Attempting to extend a template which has already been rendered."),function t(e,n){n.attributes&&(e.attributes||(e.attributes={}),hl(e.attributes,n.attributes));n.eventListeners&&(e.eventListeners||(e.eventListeners={}),hl(e.eventListeners,n.eventListeners));n.text&&e.text.push(...n.text);if(n.children&&n.children.length){if(e.children.length!=n.children.length)throw new T.b("ui-template-extend-children-mismatch: The number of children in extended definition does not match.");let o=0;for(const i of n.children)t(e.children[o++],i)}}(t,cl(al(e)))}_renderNode(t){let e;if(e=t.node?this.tag&&this.text:this.tag?this.text:!this.text)throw new T.b('ui-template-wrong-syntax: Node definition must have either "tag" or "text" when rendering a new Node.');return this.text?this._renderText(t):this._renderElement(t)}_renderElement(t){let e=t.node;return 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n=e.node;for(const o in t){const i=t[o];ol(i)?this._bindToObservable({schema:[i],updater:sl(n,o),data:e}):n.style[o]=i}}_renderElementChildren(t){const e=t.node,n=t.intoFragment?document.createDocumentFragment():e,o=t.isApplying;let i=0;for(const r of this.children)if(gl(r)){if(!o){r.setParent(e);for(const t of r)n.appendChild(t.element)}}else if(fl(r))o||(r.isRendered||r.render(),n.appendChild(r.element));else if(Ui(r))n.appendChild(r);else if(o){const e={children:[],bindings:[],attributes:{}};t.revertData.children.push(e),r._renderNode({node:n.childNodes[i++],isApplying:!0,revertData:e})}else n.appendChild(r.render());t.intoFragment&&e.appendChild(n)}_setUpListeners(t){if(this.eventListeners)for(const e in this.eventListeners){const n=this.eventListeners[e].map(n=>{const[o,i]=e.split("@");return n.activateDomEventListener(o,i,t)});t.revertData&&t.revertData.bindings.push(n)}}_bindToObservable({schema:t,updater:e,data:n}){const o=n.revertData;il(t,e,n);const i=t.filter(t=>!ul(t)).filter(t=>t.observable).map(o=>o.activateAttributeListener(t,e,n));o&&o.bindings.push(i)}_revertTemplateFromNode(t,e){for(const t of e.bindings)for(const e of t)e();if(e.text)t.textContent=e.text;else{for(const n in e.attributes){const o=e.attributes[n];null===o?t.removeAttribute(n):t.setAttribute(n,o)}for(let n=0;nil(t,e,n);return this.emitter.listenTo(this.observable,"change:"+this.attribute,o),()=>{this.emitter.stopListening(this.observable,"change:"+this.attribute,o)}}}class el extends tl{activateDomEventListener(t,e,n){const o=(t,n)=>{e&&!n.target.matches(e)||("function"==typeof this.eventNameOrFunction?this.eventNameOrFunction(n):this.observable.fire(this.eventNameOrFunction,n))};return this.emitter.listenTo(n.node,t,o),()=>{this.emitter.stopListening(n.node,t,o)}}}class nl extends tl{getValue(t){return!ul(super.getValue(t))&&(this.valueIfTrue||!0)}}function ol(t){return!!t&&(t.value&&(t=t.value),Array.isArray(t)?t.some(ol):t instanceof tl)}function il(t,e,{node:n}){let o=function(t,e){return t.map(t=>t instanceof tl?t.getValue(e):t)}(t,n);ul(o=1==t.length&&t[0]instanceof nl?o[0]:o.reduce(dl,""))?e.remove():e.set(o)}function rl(t,e,n){return{set(o){t.setAttributeNS(n,e,o)},remove(){t.removeAttributeNS(n,e)}}}function sl(t,e){return{set(n){t.style[e]=n},remove(){t.style[e]=null}}}function al(t){return Xc(t,t=>{if(t&&(t instanceof tl||pl(t)||fl(t)||gl(t)))return t})}function cl(t){if("string"==typeof t?t=function(t){return{text:[t]}}(t):t.text&&function(t){Array.isArray(t.text)||(t.text=[t.text])}(t),t.on&&(t.eventListeners=function(t){for(const e in t)ll(t,e);return t}(t.on),delete t.on),!t.text){t.attributes&&function(t){for(const e in t)t[e].value&&(t[e].value=[].concat(t[e].value)),ll(t,e)}(t.attributes);const e=[];if(t.children)if(gl(t.children))e.push(t.children);else for(const n of t.children)pl(n)||fl(n)||Ui(n)?e.push(n):e.push(new Zc(n));t.children=e}return t}function ll(t,e){Array.isArray(t[e])||(t[e]=[t[e]])}function dl(t,e){return ul(e)?t:ul(t)?e:`${t} ${e}`}function hl(t,e){for(const n in e)t[n]?t[n].push(...e[n]):t[n]=e[n]}function ul(t){return!t&&0!==t}function fl(t){return t instanceof bl}function pl(t){return t instanceof Zc}function gl(t){return t instanceof Gc}function ml(t){return"class"==t||"style"==t}n(119);class bl{constructor(t){this.element=null,this.isRendered=!1,this.locale=t,this.t=t&&t.t,this._viewCollections=new ti,this._unboundChildren=this.createCollection(),this._viewCollections.on("add",(e,n)=>{n.locale=t}),this.decorate("render")}get bindTemplate(){return this._bindTemplate?this._bindTemplate:this._bindTemplate=Zc.bind(this,this)}createCollection(){const t=new Gc;return this._viewCollections.add(t),t}registerChild(t){uo(t)||(t=[t]);for(const e of t)this._unboundChildren.add(e)}deregisterChild(t){uo(t)||(t=[t]);for(const e of t)this._unboundChildren.remove(e)}setTemplate(t){this.template=new Zc(t)}extendTemplate(t){Zc.extend(this.template,t)}render(){if(this.isRendered)throw new T.b("ui-view-render-already-rendered: This View has already been rendered.");this.template&&(this.element=this.template.render(),this.registerChild(this.template.getViews())),this.isRendered=!0}destroy(){this.stopListening(),this._viewCollections.map(t=>t.destroy())}}function wl({element:t,target:e,positions:n,limiter:o,fitInViewport:i}){ct(e)&&(e=e()),ct(o)&&(o=o());const r=function(t){for(;t&&"html"!=t.tagName.toLowerCase();){if("static"!=Xi.window.getComputedStyle(t).position)return t;t=t.parentElement}return null}(t.parentElement),s=new vs(t),a=new vs(e);let c,l;if(o||i){const t=o&&new vs(o).getVisible(),e=i&&new vs(Xi.window);[l,c]=function(t,e,n,o,i){let r,s,a=0,c=0;const l=n.getArea();return t.some(t=>{const[d,h]=_l(t,e,n);let u,f;if(o)if(i){const t=o.getIntersection(i);u=t?t.getIntersectionArea(h):0}else u=o.getIntersectionArea(h);function p(){c=f,a=u,r=h,s=d}return i&&(f=i.getIntersectionArea(h)),i&&!o?f>c&&p():!i&&o?u>a&&p():f>c&&u>=a?p():f>=c&&u>a&&p(),u===l}),r?[s,r]:null}(n,a,s,t,e)||_l(n[0],a,s)}else[l,c]=_l(n[0],a,s);let{left:d,top:h}=vl(c);if(r){const t=vl(new vs(r)),e=ws(r);d-=t.left,h-=t.top,d+=r.scrollLeft,h+=r.scrollTop,d-=e.left,h-=e.top}return{left:d,top:h,name:l}}function _l(t,e,n){const{left:o,top:i,name:r}=t(e,n);return[r,n.clone().moveTo(o,i)]}function vl({left:t,top:e}){const{scrollX:n,scrollY:o}=Xi.window;return{left:t+n,top:e+o}}function kl(t){return e=>e+t}j(bl,rr),j(bl,Fo);n(116);const yl=kl("px"),xl=Xi.document.body;class Al extends bl{constructor(t){super(t);const e=this.bindTemplate;this.set("top",0),this.set("left",0),this.set("position","arrow_nw"),this.set("isVisible",!1),this.set("withArrow",!0),this.set("className"),this.content=this.createCollection(),this.setTemplate({tag:"div",attributes:{class:["ck","ck-balloon-panel",e.to("position",t=>`ck-balloon-panel_${t}`),e.if("isVisible","ck-balloon-panel_visible"),e.if("withArrow","ck-balloon-panel_with-arrow"),e.to("className")],style:{top:e.to("top",yl),left:e.to("left",yl)}},children:this.content})}show(){this.isVisible=!0}hide(){this.isVisible=!1}attachTo(t){this.show();const e=Al.defaultPositions,n=Object.assign({},{element:this.element,positions:[e.southArrowNorth,e.southArrowNorthWest,e.southArrowNorthEast,e.northArrowSouth,e.northArrowSouthWest,e.northArrowSouthEast],limiter:xl,fitInViewport:!0},t),{top:o,left:i,name:r}=Al._getOptimalPosition(n);Object.assign(this,{top:o,left:i,position:r})}pin(t){this.unpin(),this._pinWhenIsVisibleCallback=(()=>{this.isVisible?this._startPinning(t):this._stopPinning()}),this._startPinning(t),this.listenTo(this,"change:isVisible",this._pinWhenIsVisibleCallback)}unpin(){this._pinWhenIsVisibleCallback&&(this._stopPinning(),this.stopListening(this,"change:isVisible",this._pinWhenIsVisibleCallback),this._pinWhenIsVisibleCallback=null,this.hide())}_startPinning(t){this.attachTo(t);const e=Cl(t.target),n=t.limiter?Cl(t.limiter):xl;this.listenTo(Xi.document,"scroll",(o,i)=>{const r=i.target,s=e&&r.contains(e),a=n&&r.contains(n);!s&&!a&&e&&n||this.attachTo(t)},{useCapture:!0}),this.listenTo(Xi.window,"resize",()=>{this.attachTo(t)})}_stopPinning(){this.stopListening(Xi.document,"scroll"),this.stopListening(Xi.window,"resize")}}function Cl(t){return tr(t)?t:bs(t)?t.commonAncestorContainer:"function"==typeof t?Cl(t()):null}function Pl(t,e){return t.top-e.height-Al.arrowVerticalOffset}function Tl(t){return t.bottom+Al.arrowVerticalOffset}Al.arrowHorizontalOffset=25,Al.arrowVerticalOffset=10,Al._getOptimalPosition=wl,Al.defaultPositions={northArrowSouth:(t,e)=>({top:Pl(t,e),left:t.left+t.width/2-e.width/2,name:"arrow_s"}),northArrowSouthEast:(t,e)=>({top:Pl(t,e),left:t.left+t.width/2-e.width+Al.arrowHorizontalOffset,name:"arrow_se"}),northArrowSouthWest:(t,e)=>({top:Pl(t,e),left:t.left+t.width/2-Al.arrowHorizontalOffset,name:"arrow_sw"}),northWestArrowSouth:(t,e)=>({top:Pl(t,e),left:t.left-e.width/2,name:"arrow_s"}),northWestArrowSouthWest:(t,e)=>({top:Pl(t,e),left:t.left-Al.arrowHorizontalOffset,name:"arrow_sw"}),northWestArrowSouthEast:(t,e)=>({top:Pl(t,e),left:t.left-e.width+Al.arrowHorizontalOffset,name:"arrow_se"}),northEastArrowSouth:(t,e)=>({top:Pl(t,e),left:t.right-e.width/2,name:"arrow_s"}),northEastArrowSouthEast:(t,e)=>({top:Pl(t,e),left:t.right-e.width+Al.arrowHorizontalOffset,name:"arrow_se"}),northEastArrowSouthWest:(t,e)=>({top:Pl(t,e),left:t.right-Al.arrowHorizontalOffset,name:"arrow_sw"}),southArrowNorth:(t,e)=>({top:Tl(t),left:t.left+t.width/2-e.width/2,name:"arrow_n"}),southArrowNorthEast:(t,e)=>({top:Tl(t),left:t.left+t.width/2-e.width+Al.arrowHorizontalOffset,name:"arrow_ne"}),southArrowNorthWest:(t,e)=>({top:Tl(t),left:t.left+t.width/2-Al.arrowHorizontalOffset,name:"arrow_nw"}),southWestArrowNorth:(t,e)=>({top:Tl(t),left:t.left-e.width/2,name:"arrow_n"}),southWestArrowNorthWest:(t,e)=>({top:Tl(t),left:t.left-Al.arrowHorizontalOffset,name:"arrow_nw"}),southWestArrowNorthEast:(t,e)=>({top:Tl(t),left:t.left-e.width+Al.arrowHorizontalOffset,name:"arrow_ne"}),southEastArrowNorth:(t,e)=>({top:Tl(t),left:t.right-e.width/2,name:"arrow_n"}),southEastArrowNorthEast:(t,e)=>({top:Tl(t),left:t.right-e.width+Al.arrowHorizontalOffset,name:"arrow_ne"}),southEastArrowNorthWest:(t,e)=>({top:Tl(t),left:t.right-Al.arrowHorizontalOffset,name:"arrow_nw"})};class Sl extends Kc{static get pluginName(){return"ContextualBalloon"}init(){this.view=new Al,this.positionLimiter=(()=>{const t=this.editor.editing.view,e=t.document.selection.editableElement;return e?t.domConverter.mapViewToDom(e.root):null}),this._stack=new Map,this.editor.ui.view.body.add(this.view),this.editor.ui.focusTracker.add(this.view.element)}get visibleView(){const t=this._stack.get(this.view.content.get(0));return t?t.view:null}hasView(t){return this._stack.has(t)}add(t){if(this.hasView(t.view))throw new T.b("contextualballoon-add-view-exist: Cannot add configuration of the same view twice.");this.visibleView&&this.view.content.remove(this.visibleView),this._stack.set(t.view,t),this._show(t)}remove(t){if(!this.hasView(t))throw new T.b("contextualballoon-remove-view-not-exist: Cannot remove configuration of not existing view.");if(this.visibleView===t){this.view.content.remove(t),this._stack.delete(t);const e=Array.from(this._stack.values()).pop();e?this._show(e):this.view.hide()}else this._stack.delete(t)}updatePosition(t){t&&(this._stack.get(this.visibleView).position=t),this.view.pin(this._getBalloonPosition())}_show({view:t,balloonClassName:e=""}){this.view.className=e,this.view.content.add(t),this.view.pin(this._getBalloonPosition())}_getBalloonPosition(){let t=Array.from(this._stack.values()).pop().position;return t&&!t.limiter&&(t=Object.assign({},t,{limiter:this.positionLimiter})),t}}class El{constructor(){this.set("isFocused",!1),this.focusedElement=null,this._elements=new Set,this._nextEventLoopTimeout=null}add(t){if(this._elements.has(t))throw new T.b("focusTracker-add-element-already-exist");this.listenTo(t,"focus",()=>this._focus(t),{useCapture:!0}),this.listenTo(t,"blur",()=>this._blur(),{useCapture:!0}),this._elements.add(t)}remove(t){t===this.focusedElement&&this._blur(t),this._elements.has(t)&&(this.stopListening(t),this._elements.delete(t))}_focus(t){clearTimeout(this._nextEventLoopTimeout),this.focusedElement=t,this.isFocused=!0}_blur(){clearTimeout(this._nextEventLoopTimeout),this._nextEventLoopTimeout=setTimeout(()=>{this.focusedElement=null,this.isFocused=!1},0)}}j(El,rr),j(El,Fo);class Rl{constructor(t){if(Object.assign(this,t),t.actions&&t.keystrokeHandler)for(const e in t.actions){let n=t.actions[e];"string"==typeof n&&(n=[n]);for(const o of n)t.keystrokeHandler.set(o,(t,n)=>{this[e](),n()})}}get first(){return this.focusables.find(Ol)||null}get last(){return this.focusables.filter(Ol).slice(-1)[0]||null}get next(){return this._getFocusableItem(1)}get previous(){return this._getFocusableItem(-1)}get current(){let t=null;return null===this.focusTracker.focusedElement?null:(this.focusables.find((e,n)=>{const o=e.element===this.focusTracker.focusedElement;return o&&(t=n),o}),t)}focusFirst(){this._focus(this.first)}focusLast(){this._focus(this.last)}focusNext(){this._focus(this.next)}focusPrevious(){this._focus(this.previous)}_focus(t){t&&t.focus()}_getFocusableItem(t){const e=this.current,n=this.focusables.length;if(!n)return null;if(null===e)return this[1===t?"first":"last"];let o=(e+n+t)%n;do{const e=this.focusables.get(o);if(Ol(e))return e;o=(o+n+t)%n}while(o!==e);return null}}function Ol(t){return!(!t.focus||"none"==Xi.window.getComputedStyle(t.element).display)}class Il extends bl{constructor(t){super(t),this.setTemplate({tag:"span",attributes:{class:["ck","ck-toolbar__separator"]}})}}n(114);class Vl extends bl{constructor(t){super(t);const e=this.bindTemplate;this.items=this.createCollection(),this.focusTracker=new El,this.keystrokes=new qc,this.set("isVertical",!1),this.set("className"),this._focusCycler=new Rl({focusables:this.items,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:["arrowleft","arrowup"],focusNext:["arrowright","arrowdown"]}}),this.setTemplate({tag:"div",attributes:{class:["ck","ck-toolbar",e.if("isVertical","ck-toolbar_vertical"),e.to("className")]},children:this.items,on:{mousedown:function(t){return t.bindTemplate.to(e=>{e.target===t.element&&e.preventDefault()})}(this)}})}render(){super.render();for(const t of this.items)this.focusTracker.add(t.element);this.items.on("add",(t,e)=>{this.focusTracker.add(e.element)}),this.items.on("remove",(t,e)=>{this.focusTracker.remove(e.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}focusLast(){this._focusCycler.focusLast()}fillFromConfig(t,e){t.map(t=>{"|"==t?this.items.add(new Il):e.has(t)?this.items.add(e.create(t)):fs.a.warn("toolbarview-item-unavailable: The requested toolbar item is unavailable.",{name:t})})}}class Ml extends Kc{static get pluginName(){return"BalloonToolbar"}static get requires(){return[Sl]}constructor(t){super(t),this.toolbarView=this._createToolbarView(),this.focusTracker=new El,t.once("uiReady",()=>{this.focusTracker.add(t.ui.view.editableElement),this.focusTracker.add(this.toolbarView.element)}),this._balloon=t.plugins.get(Sl),this._fireSelectionChangeDebounced=hs(()=>this.fire("_selectionChangeDebounced"),200),this.decorate("show")}init(){const t=this.editor.model.document.selection;this.listenTo(this.focusTracker,"change:isFocused",(t,e,n)=>{const o=this._balloon.visibleView===this.toolbarView;!n&&o?this.hide():n&&this.show()}),this.listenTo(t,"change:range",(e,n)=>{(n.directChange||t.isCollapsed)&&this.hide(),this._fireSelectionChangeDebounced()}),this.listenTo(this,"_selectionChangeDebounced",()=>{this.editor.editing.view.document.isFocused&&this.show()})}afterInit(){const t=function(t){return Array.isArray(t)?{items:t}:t?Object.assign({items:[]},t):{items:[]}}(this.editor.config.get("balloonToolbar")),e=this.editor.ui.componentFactory;this.toolbarView.fillFromConfig(t.items,e)}_createToolbarView(){const t=new Vl(this.editor.locale);return t.extendTemplate({attributes:{class:["ck-toolbar_floating"]}}),t.render(),t}show(){const t=this.editor;this._balloon.hasView(this.toolbarView)||t.model.document.selection.isCollapsed||Array.from(this.toolbarView.items).every(t=>void 0!==t.isEnabled&&!t.isEnabled)||(this.listenTo(this.editor.ui,"update",()=>{this._balloon.updatePosition(this._getBalloonPositionData())}),this._balloon.add({view:this.toolbarView,position:this._getBalloonPositionData(),balloonClassName:"ck-toolbar-container"}))}hide(){this._balloon.hasView(this.toolbarView)&&(this.stopListening(this.editor.ui,"update"),this._balloon.remove(this.toolbarView))}_getBalloonPositionData(){const t=this.editor.editing.view,e=t.document,n=e.selection,o=e.selection.isBackward;return{target:()=>{const e=o?n.getFirstRange():n.getLastRange(),i=vs.getDomRangeRects(t.domConverter.viewRangeToDom(e));return o?i[0]:(i.length>1&&0===i[i.length-1].width&&i.pop(),i[i.length-1])},positions:function(t){const e=Al.defaultPositions;return t?[e.northWestArrowSouth,e.northWestArrowSouthWest,e.northWestArrowSouthEast,e.southWestArrowNorth,e.southWestArrowNorthWest,e.southWestArrowNorthEast]:[e.southEastArrowNorth,e.southEastArrowNorthEast,e.southEastArrowNorthWest,e.northEastArrowSouth,e.northEastArrowSouthEast,e.northEastArrowSouthWest]}(o)}}destroy(){this._fireSelectionChangeDebounced.cancel(),this.stopListening(),super.destroy()}}class Nl{constructor(t){this.editor=t,this._components=new Map}*names(){for(const t of this._components.values())yield t.originalName}add(t,e){if(this.has(t))throw new T.b("componentfactory-item-exists: The item already exists in the component factory.",{name:t});this._components.set(Bl(t),{callback:e,originalName:t})}create(t){if(!this.has(t))throw new T.b("componentfactory-item-missing: The required component is not registered in the factory.",{name:t});return this._components.get(Bl(t)).callback(this.editor.locale)}has(t){return this._components.has(Bl(t))}}function Bl(t){return String(t).toLowerCase()}class Fl{constructor(t,e){this.editor=t,this.view=e,this.componentFactory=new Nl(t),this.focusTracker=new El,this.listenTo(t.editing.view.document,"layoutChanged",()=>this.update())}update(){this.fire("update")}destroy(){this.stopListening(),this.view.destroy()}}j(Fl,M);class Dl extends Fl{init(){const t=this.editor,e=this.view,n=t.plugins.get("BalloonToolbar");e.render();const o=t.editing.view.document.getRoot();e.editable.bind("isReadOnly").to(o),e.editable.bind("isFocused").to(this.focusTracker),t.editing.view.attachDomRoot(e.editableElement),e.editable.name=o.rootName,this.focusTracker.add(e.editableElement),function({origin:t,originKeystrokeHandler:e,originFocusTracker:n,toolbar:o,beforeFocus:i,afterBlur:r}){n.add(o.element),e.set("Alt+F10",(t,e)=>{n.isFocused&&!o.focusTracker.isFocused&&(i&&i(),o.focus(),e())}),o.keystrokes.set("Esc",(e,n)=>{o.focusTracker.isFocused&&(t.focus(),r&&r(),n())})}({origin:t.editing.view,originFocusTracker:this.focusTracker,originKeystrokeHandler:t.keystrokes,toolbar:n.toolbarView,beforeFocus(){n.show()},afterBlur(){n.hide()}})}}n(112);class Ll extends bl{constructor(t){super(t),this.body=this.createCollection()}render(){super.render(),this._renderBodyCollection()}destroy(){return this._bodyCollectionContainer.remove(),super.destroy()}_renderBodyCollection(){const t=this._bodyCollectionContainer=new Zc({tag:"div",attributes:{class:["ck","ck-reset_all","ck-body","ck-rounded-corners"]},children:this.body}).render();document.body.appendChild(t)}}class zl extends bl{constructor(t,e){super(t);const n=this.bindTemplate;e&&(this.element=this.editableElement=e),this.setTemplate({tag:"div",attributes:{class:["ck","ck-content","ck-editor__editable","ck-rounded-corners",n.to("isFocused",t=>t?"ck-focused":"ck-blurred"),n.if("isReadOnly","ck-read-only")],contenteditable:n.to("isReadOnly",t=>!t)}}),this.set("isReadOnly",!1),this.set("isFocused",!1),this.externalElement=e}render(){super.render(),this.externalElement?this.template.apply(this.element=this.externalElement):this.editableElement=this.element}destroy(){this.externalElement&&this.template.revert(this.externalElement),super.destroy()}}class jl extends zl{constructor(t,e){super(t,e);const n=this.bindTemplate,o=this.t;this.set("name",null);this.extendTemplate({attributes:{role:"textbox","aria-label":n.to("name",t=>o("az",[t])),class:"ck-editor__editable_inline"}})}}class ql extends Ll{constructor(t,e){super(t),this.editable=new jl(t,e)}render(){super.render(),this.registerChild(this.editable)}get editableElement(){return this.editable.element}}function Hl(t,e){t instanceof HTMLTextAreaElement&&(t.value=e),t.innerHTML=e}var Ul={updateSourceElement(){if(!this.sourceElement)throw new T.b("editor-missing-sourceelement: Cannot update the source element of a detached editor.");Hl(this.sourceElement,this.data.get())}};class Wl extends Uc{constructor(t,e){super(e),tr(t)&&(this.sourceElement=t),this.config.get("plugins").push(Ml),this.config.define("balloonToolbar",this.config.get("toolbar")),this.data.processor=new $c,this.model.document.createRoot(),this.ui=new Dl(this,new ql(this.locale,this.sourceElement)),function(t){if(!ct(t.updateSourceElement))throw new T.b("attachtoform-missing-elementapi-interface: Editor passed to attachToForm() must implement ElementApi.");const e=t.sourceElement;if(e&&"textarea"===e.tagName.toLowerCase()&&e.form){let n;const o=e.form,i=()=>t.updateSourceElement();ct(o.submit)&&(n=o.submit,o.submit=(()=>{i(),n.apply(o)})),o.addEventListener("submit",i),t.on("destroy",()=>{o.removeEventListener("submit",i),n&&(o.submit=n)})}}(this)}get element(){return this.ui.view.editable.element}destroy(){const t=this.getData();return this.ui.destroy(),super.destroy().then(()=>{this.sourceElement&&Hl(this.sourceElement,t)})}static create(t,e){return new Promise(n=>{const o=new this(t,e);n(o.initPlugins().then(()=>{o.ui.init(),o.fire("uiReady")}).then(()=>{const e=tr(t)?function(t){return t instanceof HTMLTextAreaElement?t.value:t.innerHTML}(t):t;return o.data.init(e)}).then(()=>{o.fire("dataReady"),o.fire("ready")}).then(()=>o))})}}j(Wl,{setData(t){this.data.set(t)},getData(){return this.data.get()}}),j(Wl,Ul);class $l{constructor(t){this.files=function(t){const e=t.files?Array.from(t.files):[],n=t.items?Array.from(t.items):[];if(e.length)return e;return n.filter(t=>"file"===t.kind).map(t=>t.getAsFile())}(t),this._native=t}get types(){return this._native.types}getData(t){return this._native.getData(t)}setData(t,e){this._native.setData(t,e)}}class Kl extends Qr{constructor(t){super(t);const e=this.document;function n(t,n){n.preventDefault();const o=n.dropRange?[n.dropRange]:Array.from(e.selection.getRanges());e.fire("clipboardInput",{dataTransfer:n.dataTransfer,targetRanges:o})}this.domEventType=["paste","copy","cut","drop","dragover"],this.listenTo(e,"paste",n,{priority:"low"}),this.listenTo(e,"drop",n,{priority:"low"})}onDomEvent(t){const e={dataTransfer:new $l(t.clipboardData?t.clipboardData:t.dataTransfer)};"drop"==t.type&&(e.dropRange=function(t,e){const n=e.target.ownerDocument,o=e.clientX,i=e.clientY;let r;n.caretRangeFromPoint&&n.caretRangeFromPoint(o,i)?r=n.caretRangeFromPoint(o,i):e.rangeParent&&((r=n.createRange()).setStart(e.rangeParent,e.rangeOffset),r.collapse(!0));return r?t.domConverter.domRangeToView(r):t.document.selection.getFirstRange()}(this.view,t)),this.fire(t.type,t,e)}}const Gl=["figcaption","li"];class Jl extends Kc{static get pluginName(){return"Clipboard"}init(){const t=this.editor,e=t.model.document,n=t.editing.view,o=n.document;function i(n,i){const r=i.dataTransfer;i.preventDefault();const s=t.data.toView(t.model.getSelectedContent(e.selection));o.fire("clipboardOutput",{dataTransfer:r,content:s,method:n.name})}this._htmlDataProcessor=new $c,n.addObserver(Kl),this.listenTo(o,"clipboardInput",e=>{t.isReadOnly&&e.stop()},{priority:"highest"}),this.listenTo(o,"clipboardInput",(t,e)=>{const o=e.dataTransfer;let i="";o.getData("text/html")?i=function(t){return t.replace(/(\s+)<\/span>/g,(t,e)=>1==e.length?" ":e)}(o.getData("text/html")):o.getData("text/plain")&&(i=function(t){return(t=t.replace(//g,">").replace(/\n\n/g,"

").replace(/\n/g,"
").replace(/^\s/," ").replace(/\s$/," ").replace(/\s\s/g,"  ")).indexOf("

")>-1&&(t=`

${t}

`),t}(o.getData("text/plain"))),i=this._htmlDataProcessor.toView(i),this.fire("inputTransformation",{content:i,dataTransfer:o}),n.scrollToTheSelection()},{priority:"low"}),this.listenTo(this,"inputTransformation",(t,e)=>{if(!e.content.isEmpty){const t=this.editor.data,n=this.editor.model,o=t.toModel(e.content,"$clipboardHolder");if(0==o.childCount)return;n.insertContent(o)}},{priority:"low"}),this.listenTo(o,"copy",i,{priority:"low"}),this.listenTo(o,"cut",(e,n)=>{t.isReadOnly?n.preventDefault():i(e,n)},{priority:"low"}),this.listenTo(o,"clipboardOutput",(n,o)=>{o.content.isEmpty||(o.dataTransfer.setData("text/html",this._htmlDataProcessor.toData(o.content)),o.dataTransfer.setData("text/plain",function t(e){let n="";if(e.is("text")||e.is("textProxy"))n=e.data;else if(e.is("img")&&e.hasAttribute("alt"))n=e.getAttribute("alt");else{let o=null;for(const i of e.getChildren()){const e=t(i);o&&(o.is("containerElement")||i.is("containerElement"))&&(Gl.includes(o.name)||Gl.includes(i.name)?n+="\n":n+="\n\n"),n+=e,o=i}}return n}(o.content))),"cut"==o.method&&t.model.deleteContent(e.selection)},{priority:"low"})}}class Ql{constructor(t){this.editor=t,this.set("value",void 0),this.set("isEnabled",!1),this.decorate("execute"),this.listenTo(this.editor.model.document,"change",()=>{this.refresh()}),this.on("execute",t=>{this.isEnabled||t.stop()},{priority:"high"}),this.listenTo(t,"change:isReadOnly",(t,e,n)=>{n?(this.on("set:isEnabled",Xl,{priority:"highest"}),this.isEnabled=!1):(this.off("set:isEnabled",Xl),this.refresh())})}refresh(){this.isEnabled=!0}execute(){}destroy(){this.stopListening()}}function Xl(t){t.return=!1,t.stop()}j(Ql,Fo);class Yl extends Ql{execute(){const t=this.editor.model,e=t.document;t.change(n=>{!function(t,e,n,o){const i=n.isCollapsed,r=n.getFirstRange(),s=r.start.parent,a=r.end.parent;if(o.isLimit(s)||o.isLimit(a))return void(i||s!=a||t.deleteContent(n));if(i)Zl(e,r.start);else{const o=!(r.start.isAtStart&&r.end.isAtEnd),i=s==a;t.deleteContent(n,{leaveUnmerged:o}),o&&(i?Zl(e,n.focus):e.setSelection(a,0))}}(this.editor.model,n,e.selection,t.schema),this.fire("afterExecute",{writer:n})})}}function Zl(t,e){t.split(e),t.setSelection(e.parent.nextSibling,0)}class td extends cr{constructor(t){super(t);const e=this.document;e.on("keydown",(t,n)=>{if(this.isEnabled&&n.keyCode==ui.enter){let o;e.once("enter",t=>o=t,{priority:"highest"}),e.fire("enter",new Jr(e,n.domEvent,{isSoft:n.shiftKey})),o&&o.stop.called&&t.stop()}})}observe(){}}class ed extends Kc{static get pluginName(){return"Enter"}init(){const t=this.editor,e=t.editing.view,n=e.document;e.addObserver(td),t.commands.add("enter",new Yl(t)),this.listenTo(n,"enter",(n,o)=>{o.preventDefault(),o.isSoft||(t.execute("enter"),e.scrollToTheSelection())},{priority:"low"})}}class nd extends Ql{execute(){const t=this.editor.model,e=t.document;t.change(n=>{!function(t,e,n){const o=n.isCollapsed,i=n.getFirstRange(),r=i.start.parent,s=i.end.parent,a=r==s;if(o)od(e,i.end);else{const o=!(i.start.isAtStart&&i.end.isAtEnd);t.deleteContent(n,{leaveUnmerged:o}),a?od(e,n.focus):o&&e.setSelection(s,0)}}(t,n,e.selection),this.fire("afterExecute",{writer:n})})}refresh(){const t=this.editor.model,e=t.document;this.isEnabled=function(t,e){if(e.rangeCount>1)return!1;const n=e.anchor;if(!n||!t.checkChild(n,"softBreak"))return!1;const o=e.getFirstRange(),i=o.start.parent,r=o.end.parent;if((id(i,t)||id(r,t))&&i!==r)return!1;return!0}(t.schema,e.selection)}}function od(t,e){const n=t.createElement("softBreak");t.insert(n,e),t.setSelection(n,"after")}function id(t,e){return!t.is("rootElement")&&(e.isLimit(t)||id(t.parent,e))}class rd extends Kc{static get pluginName(){return"ShiftEnter"}init(){const t=this.editor,e=t.model.schema,n=t.conversion,o=t.editing.view,i=o.document;e.register("softBreak",{allowWhere:"$text"}),n.for("upcast").add(Va({model:"softBreak",view:"br"})),n.for("downcast").add(aa({model:"softBreak",view:(t,e)=>e.createEmptyElement("br")})),o.addObserver(td),t.commands.add("shiftEnter",new nd(t)),this.listenTo(i,"enter",(e,n)=>{n.preventDefault(),n.isSoft&&(t.execute("shiftEnter"),o.scrollToTheSelection())},{priority:"low"})}}class sd{constructor(t,e=20){this.model=t,this.size=0,this.limit=e,this.isLocked=!1,this._changeCallback=((t,e)=>{"transparent"!=e.type&&e!==this._batch&&this._reset(!0)}),this._selectionChangeCallback=(()=>{this._reset()}),this.model.document.on("change",this._changeCallback),this.model.document.selection.on("change:range",this._selectionChangeCallback),this.model.document.selection.on("change:attribute",this._selectionChangeCallback)}get batch(){return this._batch||(this._batch=this.model.createBatch()),this._batch}input(t){this.size+=t,this.size>=this.limit&&this._reset(!0)}lock(){this.isLocked=!0}unlock(){this.isLocked=!1}destroy(){this.model.document.off("change",this._changeCallback),this.model.document.selection.off("change:range",this._selectionChangeCallback),this.model.document.selection.off("change:attribute",this._selectionChangeCallback)}_reset(t){this.isLocked&&!t||(this._batch=null,this.size=0)}}class ad extends Ql{constructor(t,e){super(t),this._buffer=new sd(t.model,e)}get buffer(){return this._buffer}destroy(){super.destroy(),this._buffer.destroy()}execute(t={}){const e=this.editor.model,n=e.document,o=t.text||"",i=o.length,r=t.range||n.selection.getFirstRange(),s=t.resultRange;e.enqueueChange(this._buffer.batch,t=>{const e=r.isCollapsed;this._buffer.lock(),e||t.remove(r),o&&t.insertText(o,n.selection.getAttributes(),r.start),s?t.setSelection(s):e&&t.setSelection(r.start.getShiftedBy(i)),this._buffer.unlock(),this._buffer.input(i)})}}function cd(t){let e=null;const n=t.model,o=t.editing.view,i=t.commands.get("input");function r(){const t=i.buffer;t.lock(),n.enqueueChange(t.batch,()=>{n.deleteContent(n.document.selection)}),t.unlock()}o.document.on("keydown",(t,s)=>(function(t){const s=n.document,a=o.document.isComposing,c=e&&e.isEqual(s.selection);if(e=null,!i.isEnabled)return;if(function(t){if(t.ctrlKey)return!0;return ld.includes(t.keyCode)}(t)||s.selection.isCollapsed)return;if(a&&229===t.keyCode)return;if(!a&&229===t.keyCode&&c)return;r()})(s),{priority:"lowest"}),o.document.on("compositionstart",function(){const t=n.document,e=1!==t.selection.rangeCount||t.selection.getFirstRange().isFlat;if(t.selection.isCollapsed||e)return;r()},{priority:"lowest"}),o.document.on("compositionend",()=>{e=n.createSelection(n.document.selection)},{priority:"lowest"})}const ld=[fi("arrowUp"),fi("arrowRight"),fi("arrowDown"),fi("arrowLeft"),9,16,17,18,19,20,27,33,34,35,36,45,91,93,144,145,173,174,175,176,177,178,179,255];for(let t=112;t<=135;t++)ld.push(t);function dd(t){if(0==t.length)return!1;for(const e of t)if("children"===e.type&&!hd(e))return!0;return!1}function hd(t){if(t.newChildren.length-t.oldChildren.length!=1)return;const e=function(t,e){const n=[];let o,i=0;return t.forEach(t=>{"equal"==t?(r(),i++):"insert"==t?(s("insert")?o.values.push(e[i]):(r(),o={type:"insert",index:i,values:[e[i]]}),i++):s("delete")?o.howMany++:(r(),o={type:"delete",index:i,howMany:1})}),r(),n;function r(){o&&(n.push(o),o=null)}function s(t){return o&&o.type==t}}(ji(t.oldChildren,t.newChildren,ud),t.newChildren);if(e.length>1)return;const n=e[0];return n.values[0]&&n.values[0].is("text")?n:void 0}function ud(t,e){return t&&t.is("text")&&e&&e.is("text")?t.data===e.data:t===e}class fd{constructor(t){this.editor=t,this.editing=this.editor.editing}handle(t,e){if(dd(t))this._handleContainerChildrenMutations(t,e);else for(const n of t)this._handleTextMutation(n,e),this._handleTextNodeInsertion(n)}_handleContainerChildrenMutations(t,e){const n=function(t){const e=t.map(t=>t.node).reduce((t,e)=>t.getCommonAncestor(e,{includeSelf:!0}));if(!e)return;return e.getAncestors({includeSelf:!0,parentFirst:!0}).find(t=>t.is("containerElement")||t.is("rootElement"))}(t);if(!n)return;const o=this.editor.editing.view.domConverter.mapViewToDom(n),i=new er,r=this.editor.data.toModel(i.domToView(o)).getChild(0),s=this.editor.editing.mapper.toModelElement(n);if(!s)return;const a=Array.from(r.getChildren()),c=Array.from(s.getChildren()),l=a[a.length-1],d=c[c.length-1];if(l&&l.is("softBreak")&&d&&!d.is("softBreak")&&a.pop(),!pd(a)||!pd(c))return;const h=a.map(t=>t.is("text")?t.data:"@").join("").replace(/\u00A0/g," "),u=c.map(t=>t.is("text")?t.data:"@").join("").replace(/\u00A0/g," ");if(u===h)return;const f=ji(u,h),{firstChangeAt:p,insertions:g,deletions:m}=gd(f);let b=null;e&&(b=this.editing.mapper.toModelRange(e.getFirstRange()));const w=h.substr(p,g),_=this.editor.model.createRange(this.editor.model.createPositionAt(s,p),this.editor.model.createPositionAt(s,p+m));this.editor.execute("input",{text:w,range:_,resultRange:b})}_handleTextMutation(t,e){if("text"!=t.type)return;const n=t.newText.replace(/\u00A0/g," "),o=ji(t.oldText.replace(/\u00A0/g," "),n),{firstChangeAt:i,insertions:r,deletions:s}=gd(o);let a=null;e&&(a=this.editing.mapper.toModelRange(e.getFirstRange()));const c=this.editing.view.createPositionAt(t.node,i),l=this.editing.mapper.toModelPosition(c),d=this.editor.model.createRange(l,l.getShiftedBy(s)),h=n.substr(i,r);this.editor.execute("input",{text:h,range:d,resultRange:a})}_handleTextNodeInsertion(t){if("children"!=t.type)return;const e=hd(t),n=this.editing.view.createPositionAt(t.node,e.index),o=this.editing.mapper.toModelPosition(n),i=e.values[0].data;this.editor.execute("input",{text:i.replace(/\u00A0/g," "),range:this.editor.model.createRange(o)})}}function pd(t){return t.every(t=>t.is("text")||t.is("softBreak"))}function gd(t){let e=null,n=null;for(let o=0;o{new fd(t).handle(n,o)})}(t)}}class bd extends Ql{constructor(t,e){super(t),this.direction=e,this._buffer=new sd(t.model,t.config.get("typing.undoStep"))}execute(t={}){const e=this.editor.model,n=e.document;e.enqueueChange(this._buffer.batch,o=>{this._buffer.lock();const i=o.createSelection(n.selection),r=i.isCollapsed;if(i.isCollapsed&&e.modifySelection(i,{direction:this.direction,unit:t.unit}),this._shouldEntireContentBeReplacedWithParagraph(t.sequence||1))return void this._replaceEntireContentWithParagraph(o);if(i.isCollapsed)return;let s=0;i.getFirstRange().getMinimalFlatRanges().forEach(t=>{s+=Xo(t.getWalker({singleCharacters:!0,ignoreElementEnd:!0,shallow:!0}))}),e.deleteContent(i,{doNotResetEntireContent:r}),this._buffer.input(s),o.setSelection(i),this._buffer.unlock()})}_shouldEntireContentBeReplacedWithParagraph(t){if(t>1)return!1;const e=this.editor.model,n=e.document.selection,o=e.schema.getLimitElement(n);if(!(n.isCollapsed&&n.containsEntireContent(o)))return!1;if(!e.schema.checkChild(o,"paragraph"))return!1;const i=o.getChild(0);return!i||"paragraph"!==i.name}_replaceEntireContentWithParagraph(t){const e=this.editor.model,n=e.document.selection,o=e.schema.getLimitElement(n),i=t.createElement("paragraph");t.remove(t.createRangeIn(o)),t.insert(i,o),t.setSelection(i,0)}}class wd extends cr{constructor(t){super(t);const e=t.document;let n=0;e.on("keyup",(t,e)=>{e.keyCode!=ui.delete&&e.keyCode!=ui.backspace||(n=0)}),e.on("keydown",(t,o)=>{const i={};if(o.keyCode==ui.delete)i.direction="forward",i.unit="character";else{if(o.keyCode!=ui.backspace)return;i.direction="backward",i.unit="codePoint"}const r=li.isMac?o.altKey:o.ctrlKey;let s;i.unit=r?"word":i.unit,i.sequence=++n,e.once("delete",t=>s=t,{priority:"highest"}),e.fire("delete",new Jr(e,o.domEvent,i)),s&&s.stop.called&&t.stop()})}observe(){}}function _d(t){const e=t.model,n=t.editing.view,o=200;let i=null,r=e.createSelection(e.document.selection),s=Date.now();e.document.selection.on("change",function(t){const n=e.createSelection(t.source);r.isEqual(n)||(i=r,r=n,s=Date.now())}),n.document.on("mutations",function(n,a){dd(a)&&function(t){for(const e of t){if("children"!==e.type)continue;const t=e.oldChildren,n=e.newChildren;if(!vd(t))continue;const o=ji(t,n),i=o.some(t=>"delete"===t),r=o.some(t=>"insert"===t);if(i&&!r)return!0}return!1}(a)&&(!function(){Date.now()-s{t.setSelection(i)});t.execute("delete")}(),n.stop())},{priority:"highest"})}function vd(t){return t.every(t=>t.is("containerElement"))}class kd extends Kc{static get pluginName(){return"Delete"}init(){const t=this.editor,e=t.editing.view,n=e.document;e.addObserver(wd),t.commands.add("forwardDelete",new bd(t,"forward")),t.commands.add("delete",new bd(t,"backward")),this.listenTo(n,"delete",(n,o)=>{t.execute("forward"==o.direction?"forwardDelete":"delete",{unit:o.unit,sequence:o.sequence}),o.preventDefault(),e.scrollToTheSelection()}),_d(t)}}class yd extends Kc{static get requires(){return[md,kd]}static get pluginName(){return"Typing"}}class xd extends Ua{get type(){return"noop"}clone(){return new xd(this.baseVersion)}getReversed(){return new xd(this.baseVersion+1)}_execute(){}static get className(){return"NoOperation"}}const Ad=new Map;function Cd(t,e,n){let o=Ad.get(t);o||(o=new Map,Ad.set(t,o)),o.set(e,n)}function Pd(t){return[t]}function Td(t,e,n={}){const o=function(t,e){const n=Ad.get(t);return n&&n.has(e)?n.get(e):Pd}(t.constructor,e.constructor);try{return o(t=t.clone(),e,n)}catch(o){throw fs.a.error("Error during operation transformation!",o.message),fs.a.error("Transformed operation",t),fs.a.error("Operation transformed by",e),fs.a.error("context.aIsStrong",n.aIsStrong),fs.a.error("context.aWasUndone",n.aWasUndone),fs.a.error("context.bWasUndone",n.bWasUndone),fs.a.error("context.abRelation",n.abRelation),fs.a.error("context.baRelation",n.baRelation),o}}function Sd(t,e,n){if(t=t.slice(),e=e.slice(),0==t.length||0==e.length)return{operationsA:t,operationsB:e};const o=new WeakMap;for(const e of t)o.set(e,0);const i={nextBaseVersionA:t[t.length-1].baseVersion+1,nextBaseVersionB:e[e.length-1].baseVersion+1,originalOperationsACount:t.length,originalOperationsBCount:e.length},r=new Ed(n.document,n.useRelations);r.setOriginalOperations(t),r.setOriginalOperations(e);let s=0;for(;s{if(t.key===e.key){const o=t.range.getDifference(e.range).map(e=>new tc(e,t.key,t.oldValue,t.newValue,0)),i=t.range.getIntersection(e.range);return i&&n.aIsStrong&&o.push(new tc(i,e.key,e.newValue,t.newValue,0)),0==o.length?[new xd(0)]:o}return[t]}),Cd(tc,oc,(t,e)=>{if(t.range.start.hasSameParentAs(e.position)&&t.range.containsPosition(e.position)){const n=t.range._getTransformedByInsertion(e.position,e.howMany,!e.shouldReceiveAttributes).map(e=>new tc(e,t.key,t.oldValue,t.newValue,t.baseVersion));if(e.shouldReceiveAttributes){const o=Id(e,t.key,t.oldValue);o&&n.unshift(o)}return n}return t.range=t.range._getTransformedByInsertion(e.position,e.howMany,!1)[0],[t]}),Cd(tc,ac,(t,e)=>{const n=[];t.range.start.hasSameParentAs(e.deletionPosition)&&(t.range.containsPosition(e.deletionPosition)||t.range.start.isEqual(e.deletionPosition))&&n.push(Us._createFromPositionAndShift(e.graveyardPosition,1));const o=t.range._getTransformedByMergeOperation(e);return o.isCollapsed||n.push(o),n.map(e=>new tc(e,t.key,t.oldValue,t.newValue,t.baseVersion))}),Cd(tc,nc,(t,e)=>{return function(t,e){const n=Us._createFromPositionAndShift(e.sourcePosition,e.howMany);let o=null,i=[];n.containsRange(t,!0)?o=t:t.start.hasSameParentAs(n.start)?(i=t.getDifference(n),o=t.getIntersection(n)):i=[t];const r=[];for(let t of i){t=t._getTransformedByDeletion(e.sourcePosition,e.howMany);const n=e.getMovedRangeStart(),o=t.start.hasSameParentAs(n);t=t._getTransformedByInsertion(n,e.howMany,o),r.push(...t)}o&&r.push(o._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany,!1)[0]);return r}(t.range,e).map(e=>new tc(e,t.key,t.oldValue,t.newValue,t.baseVersion))}),Cd(tc,cc,(t,e)=>{if(t.range.end.isEqual(e.insertionPosition))return e.graveyardPosition||t.range.end.offset++,[t];if(t.range.start.hasSameParentAs(e.splitPosition)&&t.range.containsPosition(e.splitPosition)){const n=t.clone();return n.range=new Us(e.moveTargetPosition.clone(),t.range.end._getCombined(e.splitPosition,e.moveTargetPosition)),t.range.end=e.splitPosition.clone(),t.range.end.stickiness="toPrevious",[t,n]}return t.range=t.range._getTransformedBySplitOperation(e),[t]}),Cd(oc,tc,(t,e)=>{const n=[t];if(t.shouldReceiveAttributes&&t.position.hasSameParentAs(e.range.start)&&e.range.containsPosition(t.position)){const o=Id(t,e.key,e.newValue);o&&n.push(o)}return n}),Cd(oc,oc,(t,e,n)=>t.position.isEqual(e.position)&&n.aIsStrong?[t]:(t.position=t.position._getTransformedByInsertOperation(e),[t])),Cd(oc,nc,(t,e)=>(t.position=t.position._getTransformedByMoveOperation(e),[t])),Cd(oc,cc,(t,e)=>(t.position=t.position._getTransformedBySplitOperation(e),[t])),Cd(oc,ac,(t,e)=>(t.position=t.position._getTransformedByMergeOperation(e),[t])),Cd(ic,oc,(t,e)=>(t.oldRange&&(t.oldRange=t.oldRange._getTransformedByInsertOperation(e)[0]),t.newRange&&(t.newRange=t.newRange._getTransformedByInsertOperation(e)[0]),[t])),Cd(ic,ic,(t,e,n)=>{if(t.name==e.name){if(!n.aIsStrong)return[new xd(0)];t.oldRange=e.newRange?e.newRange.clone():null}return[t]}),Cd(ic,ac,(t,e)=>(t.oldRange&&(t.oldRange=t.oldRange._getTransformedByMergeOperation(e)),t.newRange&&(t.newRange=t.newRange._getTransformedByMergeOperation(e)),[t])),Cd(ic,nc,(t,e)=>(t.oldRange&&(t.oldRange=Us._createFromRanges(t.oldRange._getTransformedByMoveOperation(e))),t.newRange&&(t.newRange=Us._createFromRanges(t.newRange._getTransformedByMoveOperation(e))),[t])),Cd(ic,cc,(t,e)=>(t.oldRange&&(t.oldRange=t.oldRange._getTransformedBySplitOperation(e)),t.newRange&&(t.newRange=t.newRange._getTransformedBySplitOperation(e)),[t])),Cd(ac,oc,(t,e)=>(t.sourcePosition.hasSameParentAs(e.position)&&(t.howMany+=e.howMany),t.sourcePosition=t.sourcePosition._getTransformedByInsertOperation(e),t.targetPosition=t.targetPosition._getTransformedByInsertOperation(e),[t])),Cd(ac,ac,(t,e,n)=>{if(t.sourcePosition.isEqual(e.sourcePosition)&&t.targetPosition.isEqual(e.targetPosition)){if(n.bWasUndone){const n=e.graveyardPosition.path.slice();return n.push(0),t.sourcePosition=new Hs(e.graveyardPosition.root,n),t.howMany=0,[t]}return[new xd(0)]}if(t.sourcePosition.isEqual(e.sourcePosition)&&!t.targetPosition.isEqual(e.targetPosition)&&!n.bWasUndone&&"splitAtSource"!=n.abRelation){const o="$graveyard"==t.targetPosition.root.rootName,i="$graveyard"==e.targetPosition.root.rootName;if(i&&!o||!(o&&!i)&&n.aIsStrong){const n=e.targetPosition._getTransformedByMergeOperation(e),o=t.targetPosition._getTransformedByMergeOperation(e);return[new nc(n,t.howMany,o,0)]}return[new xd(0)]}return t.sourcePosition.hasSameParentAs(e.targetPosition)&&(t.howMany+=e.howMany),t.sourcePosition=t.sourcePosition._getTransformedByMergeOperation(e),t.targetPosition=t.targetPosition._getTransformedByMergeOperation(e),t.graveyardPosition.isEqual(e.graveyardPosition)&&n.aIsStrong||(t.graveyardPosition=t.graveyardPosition._getTransformedByMergeOperation(e)),[t]}),Cd(ac,nc,(t,e,n)=>{const o=Us._createFromPositionAndShift(e.sourcePosition,e.howMany);return"remove"==e.type&&!n.bWasUndone&&t.deletionPosition.hasSameParentAs(e.sourcePosition)&&o.containsPosition(t.sourcePosition)?[new xd(0)]:(t.sourcePosition.hasSameParentAs(e.targetPosition)&&(t.howMany+=e.howMany),t.sourcePosition.hasSameParentAs(e.sourcePosition)&&(t.howMany-=e.howMany),t.sourcePosition=t.sourcePosition._getTransformedByMoveOperation(e),t.targetPosition=t.targetPosition._getTransformedByMoveOperation(e),t.graveyardPosition.isEqual(e.targetPosition)||(t.graveyardPosition=t.graveyardPosition._getTransformedByMoveOperation(e)),[t])}),Cd(ac,cc,(t,e,n)=>{if(e.graveyardPosition&&(t.graveyardPosition=t.graveyardPosition._getTransformedByDeletion(e.graveyardPosition,1),t.deletionPosition.isEqual(e.graveyardPosition)&&(t.howMany=e.howMany)),t.targetPosition.isEqual(e.splitPosition)){const o=0!=e.howMany,i=e.graveyardPosition&&t.deletionPosition.isEqual(e.graveyardPosition);if(o||i||"mergeTargetNotMoved"==n.abRelation)return t.sourcePosition=t.sourcePosition._getTransformedBySplitOperation(e),[t]}return t.sourcePosition.isEqual(e.splitPosition)&&("mergeSameElement"==n.abRelation||t.sourcePosition.offset>0)?(t.sourcePosition=e.moveTargetPosition.clone(),t.targetPosition=t.targetPosition._getTransformedBySplitOperation(e),[t]):(t.sourcePosition.hasSameParentAs(e.splitPosition)&&(t.howMany=e.splitPosition.offset),t.sourcePosition=t.sourcePosition._getTransformedBySplitOperation(e),t.targetPosition=t.targetPosition._getTransformedBySplitOperation(e),[t])}),Cd(nc,oc,(t,e)=>{const n=Us._createFromPositionAndShift(t.sourcePosition,t.howMany)._getTransformedByInsertOperation(e,!1)[0];return t.sourcePosition=n.start,t.howMany=n.end.offset-n.start.offset,t.targetPosition.isEqual(e.position)||(t.targetPosition=t.targetPosition._getTransformedByInsertOperation(e)),[t]}),Cd(nc,nc,(t,e,n)=>{const o=Us._createFromPositionAndShift(t.sourcePosition,t.howMany),i=Us._createFromPositionAndShift(e.sourcePosition,e.howMany);let r,s=n.aIsStrong,a=!n.aIsStrong;if("insertBefore"==n.abRelation||"insertAfter"==n.baRelation?a=!0:"insertAfter"!=n.abRelation&&"insertBefore"!=n.baRelation||(a=!1),r=t.targetPosition.isEqual(e.targetPosition)&&a?t.targetPosition._getTransformedByDeletion(e.sourcePosition,e.howMany):t.targetPosition._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany),Vd(t,e)&&Vd(e,t))return[e.getReversed()];if(o.containsPosition(e.targetPosition)&&o.containsRange(i,!0))return o.start=o.start._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany),o.end=o.end._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany),Md([o],r);if(i.containsPosition(t.targetPosition)&&i.containsRange(o,!0))return o.start=o.start._getCombined(e.sourcePosition,e.getMovedRangeStart()),o.end=o.end._getCombined(e.sourcePosition,e.getMovedRangeStart()),Md([o],r);const c=q(t.sourcePosition.getParentPath(),e.sourcePosition.getParentPath());if("prefix"==c||"extension"==c)return o.start=o.start._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany),o.end=o.end._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany),Md([o],r);"remove"!=t.type||"remove"==e.type||n.aWasUndone?"remove"==t.type||"remove"!=e.type||n.bWasUndone||(s=!1):s=!0;const l=[],d=o.getDifference(i);for(const t of d){t.start=t.start._getTransformedByDeletion(e.sourcePosition,e.howMany),t.end=t.end._getTransformedByDeletion(e.sourcePosition,e.howMany);const n="same"==q(t.start.getParentPath(),e.getMovedRangeStart().getParentPath()),o=t._getTransformedByInsertion(e.getMovedRangeStart(),e.howMany,n);l.push(...o)}const h=o.getIntersection(i);return null!==h&&s&&(h.start=h.start._getCombined(e.sourcePosition,e.getMovedRangeStart()),h.end=h.end._getCombined(e.sourcePosition,e.getMovedRangeStart()),0===l.length?l.push(h):1==l.length?i.start.isBefore(o.start)||i.start.isEqual(o.start)?l.unshift(h):l.push(h):l.splice(1,0,h)),0===l.length?[new xd(t.baseVersion)]:Md(l,r)}),Cd(nc,cc,(t,e,n)=>{let o=t.targetPosition.clone();t.targetPosition.isEqual(e.insertionPosition)&&e.graveyardPosition&&"moveTargetAfter"!=n.abRelation||(o=t.targetPosition._getTransformedBySplitOperation(e));const i=Us._createFromPositionAndShift(t.sourcePosition,t.howMany);if(i.end.isEqual(e.insertionPosition))return e.graveyardPosition||t.howMany++,t.targetPosition=o,[t];if(i.start.hasSameParentAs(e.splitPosition)&&i.containsPosition(e.splitPosition)){let t=new Us(e.splitPosition,i.end);return t=t._getTransformedBySplitOperation(e),Md([new Us(i.start,e.splitPosition),t],o)}t.targetPosition.isEqual(e.splitPosition)&&"insertAtSource"==n.abRelation&&(o=e.moveTargetPosition),t.targetPosition.isEqual(e.insertionPosition)&&"insertBetween"==n.abRelation&&(o=t.targetPosition);const r=[i._getTransformedBySplitOperation(e)];if(e.graveyardPosition){const n=i.start.isEqual(e.graveyardPosition)||i.containsPosition(e.graveyardPosition);t.howMany>1&&n&&r.push(Us._createFromPositionAndShift(e.insertionPosition,1))}return Md(r,o)}),Cd(nc,ac,(t,e,n)=>{const o=Us._createFromPositionAndShift(t.sourcePosition,t.howMany);if(e.deletionPosition.hasSameParentAs(t.sourcePosition)&&o.containsPosition(e.sourcePosition))if("remove"==t.type){if(!n.aWasUndone){const n=[];let o=e.graveyardPosition.clone(),i=e.targetPosition.clone();t.howMany>1&&(n.push(new nc(t.sourcePosition,t.howMany-1,t.targetPosition,0)),o=o._getTransformedByInsertion(t.targetPosition,t.howMany-1),i=i._getTransformedByMove(t.sourcePosition,t.targetPosition,t.howMany-1));const r=e.deletionPosition._getCombined(t.sourcePosition,t.targetPosition),s=new nc(o,1,r,0),a=s.getMovedRangeStart().path.slice();a.push(0);const c=new Hs(s.targetPosition.root,a),l=new nc(i,e.howMany,c,0);return n.push(s),n.push(l),n}}else if(1==t.howMany)return n.bWasUndone?(t.sourcePosition=e.graveyardPosition.clone(),t.targetPosition=t.targetPosition._getTransformedByMergeOperation(e),[t]):[new xd(0)];const i=Us._createFromPositionAndShift(t.sourcePosition,t.howMany)._getTransformedByMergeOperation(e);return t.sourcePosition=i.start,t.howMany=i.end.offset-i.start.offset,t.targetPosition=t.targetPosition._getTransformedByMergeOperation(e),[t]}),Cd(rc,oc,(t,e)=>(t.position=t.position._getTransformedByInsertOperation(e),[t])),Cd(rc,ac,(t,e)=>t.position.isEqual(e.deletionPosition)?(t.position=e.graveyardPosition.clone(),t.position.stickiness="toNext",[t]):(t.position=t.position._getTransformedByMergeOperation(e),[t])),Cd(rc,nc,(t,e)=>(t.position=t.position._getTransformedByMoveOperation(e),[t])),Cd(rc,rc,(t,e,n)=>{if(t.position.isEqual(e.position)){if(!n.aIsStrong)return[new xd(0)];t.oldName=e.newName}return[t]}),Cd(rc,cc,(t,e)=>{if("same"==q(t.position.path,e.splitPosition.getParentPath())&&!e.graveyardPosition){return[t,new rc(t.position.getShiftedBy(1),t.oldName,t.newName,0)]}return t.position=t.position._getTransformedBySplitOperation(e),[t]}),Cd(sc,sc,(t,e,n)=>{if(t.root===e.root&&t.key===e.key){if(!n.aIsStrong||t.newValue===e.newValue)return[new xd(0)];t.oldValue=e.newValue}return[t]}),Cd(cc,oc,(t,e)=>(t.splitPosition.hasSameParentAs(e.position)&&t.splitPosition.offset{if(!t.graveyardPosition&&!n.bWasUndone&&t.splitPosition.hasSameParentAs(e.sourcePosition)){const n=e.graveyardPosition.path.slice();n.push(0);const o=new Hs(e.graveyardPosition.root,n),i=cc.getInsertionPosition(new Hs(e.graveyardPosition.root,n)),r=new cc(o,0,null,0);return r.insertionPosition=i,t.splitPosition=t.splitPosition._getTransformedByMergeOperation(e),t.insertionPosition=cc.getInsertionPosition(t.splitPosition),t.graveyardPosition=r.insertionPosition.clone(),t.graveyardPosition.stickiness="toNext",[r,t]}return t.splitPosition.hasSameParentAs(e.deletionPosition)&&!t.splitPosition.isAfter(e.deletionPosition)&&t.howMany--,t.splitPosition.hasSameParentAs(e.targetPosition)&&(t.howMany+=e.howMany),t.splitPosition=t.splitPosition._getTransformedByMergeOperation(e),t.insertionPosition=cc.getInsertionPosition(t.splitPosition),t.graveyardPosition&&(t.graveyardPosition=t.graveyardPosition._getTransformedByMergeOperation(e)),[t]}),Cd(cc,nc,(t,e,n)=>{const o=Us._createFromPositionAndShift(e.sourcePosition,e.howMany);if(t.graveyardPosition){if(o.start.isEqual(t.graveyardPosition)||o.containsPosition(t.graveyardPosition)){const n=t.splitPosition._getTransformedByMoveOperation(e),o=t.graveyardPosition._getTransformedByMoveOperation(e),i=o.path.slice();i.push(0);const r=new Hs(o.root,i);return[new nc(n,t.howMany,r,0)]}t.graveyardPosition=t.graveyardPosition._getTransformedByMoveOperation(e)}if(t.splitPosition.hasSameParentAs(e.sourcePosition)&&o.containsPosition(t.splitPosition)){const n=e.howMany-(t.splitPosition.offset-e.sourcePosition.offset);return t.howMany-=n,t.splitPosition.hasSameParentAs(e.targetPosition)&&t.splitPosition.offset{if(t.splitPosition.isEqual(e.splitPosition)){if(!t.graveyardPosition&&!e.graveyardPosition)return[new xd(0)];if(t.graveyardPosition&&e.graveyardPosition&&t.graveyardPosition.isEqual(e.graveyardPosition))return[new xd(0)]}if(t.graveyardPosition&&e.graveyardPosition&&t.graveyardPosition.isEqual(e.graveyardPosition)){const o="$graveyard"==t.splitPosition.root.rootName,i="$graveyard"==e.splitPosition.root.rootName;if(i&&!o||!(o&&!i)&&n.aIsStrong){const n=[];return e.howMany&&n.push(new nc(e.moveTargetPosition,e.howMany,e.splitPosition,0)),t.howMany&&n.push(new nc(t.splitPosition,t.howMany,t.moveTargetPosition,0)),n}return[new xd(0)]}if(t.graveyardPosition&&(t.graveyardPosition=t.graveyardPosition._getTransformedBySplitOperation(e)),t.splitPosition.isEqual(e.insertionPosition)&&"splitBefore"==n.abRelation)return t.howMany++,[t];if(e.splitPosition.isEqual(t.insertionPosition)&&"splitBefore"==n.baRelation){const n=e.insertionPosition.path.slice();n.push(0);const o=new Hs(e.insertionPosition.root,n);return[t,new nc(t.insertionPosition,1,o,0)]}return t.splitPosition.hasSameParentAs(e.splitPosition)&&t.splitPosition.offset0}addBatch(t){const e=this.editor.model.document.selection,n={ranges:e.hasOwnRange?Array.from(e.getRanges()):[],isBackward:e.isBackward};this._stack.push({batch:t,selection:n}),this.refresh()}clearStack(){this._stack=[],this.refresh()}_restoreSelection(t,e,n){const o=this.editor.model,i=o.document,r=[];for(const e of t){const t=Bd(e,n).find(t=>t.start.root!=i.graveyard);t&&r.push(t)}r.length&&o.change(t=>{t.setSelection(r,{backward:e})})}_undo(t,e){const n=this.editor.model,o=n.document;this._createdBatches.add(e);const i=t.operations.slice().filter(t=>t.isDocumentOperation);i.reverse();for(const t of i){const i=t.baseVersion+1,r=Array.from(o.history.getOperations(i)),s=Sd([t.getReversed()],r,{useRelations:!0,document:this.editor.model.document,padWithNoOps:!1}).operationsA;for(const i of s)e.addOperation(i),n.applyOperation(i),o.history.setOperationAsUndone(t,i)}}}function Bd(t,e){const n=t.getTransformedByOperations(e);n.sort((t,e)=>t.start.isBefore(e.start)?-1:1);for(let t=1;te.batch==t):this._stack.length-1,n=this._stack.splice(e,1)[0],o=this.editor.model.createBatch();this.editor.model.enqueueChange(o,()=>{this._undo(n.batch,o);const t=this.editor.model.document.history.getOperations(n.batch.baseVersion);this._restoreSelection(n.selection.ranges,n.selection.isBackward,t),this.fire("revert",n.batch,o)}),this.refresh()}}class Dd extends Nd{execute(){const t=this._stack.pop(),e=this.editor.model.createBatch();this.editor.model.enqueueChange(e,()=>{const n=t.batch.operations[t.batch.operations.length-1].baseVersion+1,o=this.editor.model.document.history.getOperations(n);this._restoreSelection(t.selection.ranges,t.selection.isBackward,o),this._undo(t.batch,e)}),this.refresh()}}class Ld extends Kc{constructor(t){super(t),this._batchRegistry=new WeakSet}init(){const t=this.editor;this._undoCommand=new Fd(t),this._redoCommand=new Dd(t),t.commands.add("undo",this._undoCommand),t.commands.add("redo",this._redoCommand),this.listenTo(t.model,"applyOperation",(t,e)=>{const n=e[0];if(!n.isDocumentOperation)return;const o=n.batch;this._batchRegistry.has(o)||"transparent"==o.type||(this._redoCommand._createdBatches.has(o)?this._undoCommand.addBatch(o):this._undoCommand._createdBatches.has(o)||(this._undoCommand.addBatch(o),this._redoCommand.clearStack()),this._batchRegistry.add(o))},{priority:"highest"}),this.listenTo(this._undoCommand,"revert",(t,e,n)=>{this._redoCommand.addBatch(n)}),t.keystrokes.set("CTRL+Z","undo"),t.keystrokes.set("CTRL+Y","redo"),t.keystrokes.set("CTRL+SHIFT+Z","redo")}}n(110);class zd extends bl{constructor(){super();const t=this.bindTemplate;this.set("content",""),this.set("viewBox","0 0 20 20"),this.set("fillColor",""),this.setTemplate({tag:"svg",ns:"http://www.w3.org/2000/svg",attributes:{class:["ck","ck-icon"],viewBox:t.to("viewBox")}})}render(){super.render(),this._updateXMLContent(),this._colorFillPaths(),this.on("change:content",()=>{this._updateXMLContent(),this._colorFillPaths()}),this.on("change:fillColor",()=>{this._colorFillPaths()})}_updateXMLContent(){if(this.content){const t=(new DOMParser).parseFromString(this.content.trim(),"image/svg+xml").querySelector("svg"),e=t.getAttribute("viewBox");for(e&&(this.viewBox=e),this.element.innerHTML="";t.childNodes.length>0;)this.element.appendChild(t.childNodes[0])}}_colorFillPaths(){this.fillColor&&this.element.querySelectorAll(".ck-icon__fill").forEach(t=>{t.style.fill=this.fillColor})}}n(108);class jd extends bl{constructor(t){super(t),this.set("text",""),this.set("position","s");const e=this.bindTemplate;this.setTemplate({tag:"span",attributes:{class:["ck","ck-tooltip",e.to("position",t=>"ck-tooltip_"+t),e.if("text","ck-hidden",t=>!t.trim())]},children:[{tag:"span",attributes:{class:["ck","ck-tooltip__text"]},children:[{text:e.to("text")}]}]})}}n(106);class qd extends bl{constructor(t){super(t);const e=this.bindTemplate,n=R();this.set("class"),this.set("labelStyle"),this.set("icon"),this.set("isEnabled",!0),this.set("isOn",!1),this.set("isVisible",!0),this.set("keystroke"),this.set("label"),this.set("tabindex",-1),this.set("tooltip"),this.set("tooltipPosition","s"),this.set("type","button"),this.set("withText",!1),this.children=this.createCollection(),this.tooltipView=this._createTooltipView(),this.labelView=this._createLabelView(n),this.iconView=new zd,this.iconView.extendTemplate({attributes:{class:"ck-button__icon"}}),this.bind("_tooltipString").to(this,"tooltip",this,"label",this,"keystroke",this._getTooltipString.bind(this)),this.setTemplate({tag:"button",attributes:{class:["ck","ck-button",e.to("class"),e.if("isEnabled","ck-disabled",t=>!t),e.if("isVisible","ck-hidden",t=>!t),e.to("isOn",t=>t?"ck-on":"ck-off"),e.if("withText","ck-button_with-text")],type:e.to("type",t=>t||"button"),tabindex:e.to("tabindex"),"aria-labelledby":`ck-editor__aria-label_${n}`,"aria-disabled":e.if("isEnabled",!0,t=>!t),"aria-pressed":e.if("isOn",!0)},children:this.children,on:{mousedown:e.to(t=>{t.preventDefault()}),click:e.to(t=>{this.isEnabled?this.fire("execute"):t.preventDefault()})}})}render(){super.render(),this.icon&&(this.iconView.bind("content").to(this,"icon"),this.children.add(this.iconView)),this.children.add(this.tooltipView),this.children.add(this.labelView)}focus(){this.element.focus()}_createTooltipView(){const t=new jd;return t.bind("text").to(this,"_tooltipString"),t.bind("position").to(this,"tooltipPosition"),t}_createLabelView(t){const e=new bl,n=this.bindTemplate;return e.setTemplate({tag:"span",attributes:{class:["ck","ck-button__label"],style:n.to("labelStyle"),id:`ck-editor__aria-label_${t}`},children:[{text:this.bindTemplate.to("label")}]}),e}_getTooltipString(t,e,n){return t?"string"==typeof t?t:(n&&(n=function(t){return li.isMac?gi(t).map(t=>hi[t.toLowerCase()]||t).reduce((t,e)=>t.slice(-1)in di?t+e:t+"+"+e):t}(n)),t instanceof Function?t(e,n):`${e}${n?` (${n})`:""}`):""}}var Hd=n(49),Ud=n.n(Hd),Wd=n(48),$d=n.n(Wd);class Kd extends Kc{init(){const t=this.editor.t;this._addButton("undo",t("ba"),"CTRL+Z",Ud.a),this._addButton("redo",t("bb"),"CTRL+Y",$d.a)}_addButton(t,e,n,o){const i=this.editor;i.ui.componentFactory.add(t,r=>{const s=i.commands.get(t),a=new qd(r);return a.set({label:e,icon:o,keystroke:n,tooltip:!0}),a.bind("isEnabled").to(s,"isEnabled"),this.listenTo(a,"execute",()=>i.execute(t)),a})}}class Gd extends Kc{static get requires(){return[Ld,Kd]}static get pluginName(){return"Undo"}}class Jd extends Kc{static get pluginName(){return"PendingActions"}init(){this.set("hasAny",!1),this._actions=new ti({idProperty:"_id"}),this._actions.delegate("add","remove").to(this)}add(t){if("string"!=typeof t)throw new T.b("pendingactions-add-invalid-message: The message must be a string.");const e=Object.create(Fo);return e.set("message",t),this._actions.add(e),this.hasAny=!0,e}remove(t){this._actions.remove(t),this.hasAny=!!this._actions.length}get first(){return this._actions.get(0)}[Symbol.iterator](){return this._actions[Symbol.iterator]()}}class Qd{constructor(){const t=new window.FileReader;this._reader=t,this.set("loaded",0),t.onprogress=(t=>{this.loaded=t.loaded})}get error(){return this._reader.error}read(t){const e=this._reader;return this.total=t.size,new Promise((n,o)=>{e.onload=(()=>{n(e.result)}),e.onerror=(()=>{o("error")}),e.onabort=(()=>{o("aborted")}),this._reader.readAsDataURL(t)})}abort(){this._reader.abort()}}j(Qd,Fo);class Xd extends Kc{static get pluginName(){return"FileRepository"}static get requires(){return[Jd]}init(){this.loaders=new ti,this.loaders.on("add",()=>this._updatePendingAction()),this.loaders.on("remove",()=>this._updatePendingAction()),this._pendingAction=null,this.set("uploaded",0),this.set("uploadTotal",null),this.bind("uploadedPercent").to(this,"uploaded",this,"uploadTotal",(t,e)=>e?t/e*100:0)}getLoader(t){for(const e of this.loaders)if(e.file==t)return e;return null}createLoader(t){if(!this.createUploadAdapter)return fs.a.error("filerepository-no-upload-adapter: Upload adapter is not defined."),null;const e=new Yd(t);return e._adapter=this.createUploadAdapter(e),this.loaders.add(e),e.on("change:uploaded",()=>{let t=0;for(const e of this.loaders)t+=e.uploaded;this.uploaded=t}),e.on("change:uploadTotal",()=>{let t=0;for(const e of this.loaders)e.uploadTotal&&(t+=e.uploadTotal);this.uploadTotal=t}),e}destroyLoader(t){const e=t instanceof Yd?t:this.getLoader(t);e._destroy(),this.loaders.remove(e)}_updatePendingAction(){const t=this.editor.plugins.get(Jd);if(this.loaders.length){if(!this._pendingAction){const e=this.editor.t,n=t=>`${e("w")} ${parseInt(t)}%.`;this._pendingAction=t.add(n(this.uploadedPercent)),this._pendingAction.bind("message").to(this,"uploadedPercent",n)}}else t.remove(this._pendingAction),this._pendingAction=null}}j(Xd,Fo);class Yd{constructor(t,e){this.id=R(),this.file=t,this._adapter=e,this._reader=new Qd,this.set("status","idle"),this.set("uploaded",0),this.set("uploadTotal",null),this.bind("uploadedPercent").to(this,"uploaded",this,"uploadTotal",(t,e)=>e?t/e*100:0),this.set("uploadResponse",null)}read(){if("idle"!=this.status)throw new T.b("filerepository-read-wrong-status: You cannot call read if the status is different than idle.");return this.status="reading",this._reader.read(this.file).then(t=>(this.status="idle",t)).catch(t=>{if("aborted"===t)throw this.status="aborted","aborted";throw this.status="error",this._reader.error})}upload(){if("idle"!=this.status)throw new T.b("filerepository-upload-wrong-status: You cannot call upload if the status is different than idle.");return this.status="uploading",this._adapter.upload().then(t=>(this.uploadResponse=t,this.status="idle",t)).catch(t=>{if("aborted"===this.status)throw"aborted";throw this.status="error",t})}abort(){const t=this.status;this.status="aborted","reading"==t&&this._reader.abort(),"uploading"==t&&this._adapter.abort&&this._adapter.abort(),this._destroy()}_destroy(){this._reader=void 0,this._adapter=void 0,this.data=void 0,this.uploadResponse=void 0,this.file=void 0}}j(Yd,Fo);const Zd="ckCsrfToken",th=40,eh="abcdefghijklmnopqrstuvwxyz0123456789";function nh(){let t=function(t){t=t.toLowerCase();const e=document.cookie.split(";");for(const n of e){const e=n.split("="),o=decodeURIComponent(e[0].trim().toLowerCase());if(o===t)return decodeURIComponent(e[1])}return null}(Zd);return t&&t.length==th||(t=function(t){let e="";const n=new Uint8Array(t);window.crypto.getRandomValues(n);for(let t=0;t.5?o.toUpperCase():o}return e}(th),function(t,e){document.cookie=encodeURIComponent(t)+"="+encodeURIComponent(e)+";path=/"}(Zd,t)),t}class oh extends Kc{static get requires(){return[Xd]}static get pluginName(){return"CKFinderUploadAdapter"}init(){const t=this.editor.config.get("ckfinder.uploadUrl");t&&(this.editor.plugins.get(Xd).createUploadAdapter=(e=>new ih(e,t,this.editor.t)))}}class ih{constructor(t,e,n){this.loader=t,this.url=e,this.t=n}upload(){return new Promise((t,e)=>{this._initRequest(),this._initListeners(t,e),this._sendRequest()})}abort(){this.xhr&&this.xhr.abort()}_initRequest(){const t=this.xhr=new XMLHttpRequest;t.open("POST",this.url,!0),t.responseType="json"}_initListeners(t,e){const n=this.xhr,o=this.loader,i=(0,this.t)("a")+` ${o.file.name}.`;n.addEventListener("error",()=>e(i)),n.addEventListener("abort",()=>e()),n.addEventListener("load",()=>{const o=n.response;if(!o||!o.uploaded)return e(o&&o.error&&o.error.message?o.error.message:i);t({default:o.url})}),n.upload&&n.upload.addEventListener("progress",t=>{t.lengthComputable&&(o.uploadTotal=t.total,o.uploaded=t.loaded)})}_sendRequest(){const t=new FormData;t.append("upload",this.loader.file),t.append("ckCsrfToken",nh()),this.xhr.send(t)}}class rh{constructor(t,e,n){let o;if("function"==typeof n)o=n;else{const e=n;o=(()=>{t.execute(e)})}t.model.document.on("change",(n,i)=>{if("transparent"==i.type)return;const r=Array.from(t.model.document.differ.getChanges()),s=r[0];if(1!=r.length||"insert"!==s.type||"$text"!=s.name||1!=s.length)return;const a=s.position.textNode||s.position.nodeAfter;if(!a.parent.is("paragraph"))return;const c=e.exec(a.data);c&&t.model.enqueueChange(t=>{const e=t.createPositionAt(a.parent,0),n=t.createPositionAt(a.parent,c[0].length),i=t.createRange(e,n);t.remove(i),o({match:c})})})}}class sh{constructor(t,e,n){let o,i,r,s;e instanceof RegExp?o=e:r=e,"string"==typeof n?i=n:s=n,r=r||(t=>{let e;const n=[],i=[];for(;null!==(e=o.exec(t))&&!(e&&e.length<4);){let{index:t,1:o,2:r,3:s}=e;const a=o+r+s,c=[t+=e[0].length-a.length,t+o.length],l=[t+o.length+r.length,t+o.length+r.length+s.length];n.push(c),n.push(l),i.push([t+o.length,t+o.length+r.length])}return{remove:n,format:i}}),s=s||((t,e)=>{for(const n of e)t.setAttribute(i,!0,n);t.removeSelectionAttribute(i)}),t.model.document.on("change",(e,n)=>{if("transparent"==n.type)return;const o=t.model.document.selection;if(!o.isCollapsed)return;const a=Array.from(t.model.document.differ.getChanges()),c=a[0];if(1!=a.length||"insert"!==c.type||"$text"!=c.name||1!=c.length)return;const l=o.focus.parent,d=function(t){return Array.from(t.getChildren()).reduce((t,e)=>t+e.data,"")}(l).slice(0,o.focus.offset),h=r(d),u=ah(l,h.format,t.model),f=ah(l,h.remove,t.model);u.length&&f.length&&t.model.enqueueChange(e=>{const n=t.model.schema.getValidRanges(u,i);s(e,n);for(const t of f.reverse())e.remove(t)})})}}function ah(t,e,n){return e.filter(t=>void 0!==t[0]&&void 0!==t[1]).map(e=>n.createRange(n.createPositionAt(t,e[0]),n.createPositionAt(t,e[1])))}class ch extends Ql{constructor(t,e){super(t),this.attributeKey=e}refresh(){const t=this.editor.model,e=t.document;this.value=this._getValueFromFirstAllowedNode(),this.isEnabled=t.schema.checkAttributeInSelection(e.selection,this.attributeKey)}execute(t={}){const e=this.editor.model,n=e.document.selection,o=void 0===t.forceValue?!this.value:t.forceValue;e.change(t=>{if(n.isCollapsed)o?t.setSelectionAttribute(this.attributeKey,!0):t.removeSelectionAttribute(this.attributeKey);else{const i=e.schema.getValidRanges(n.getRanges(),this.attributeKey);for(const e of i)o?t.setAttribute(this.attributeKey,o,e):t.removeAttribute(this.attributeKey,e)}})}_getValueFromFirstAllowedNode(){const t=this.editor.model,e=t.schema,n=t.document.selection;if(n.isCollapsed)return n.hasAttribute(this.attributeKey);for(const t of n.getRanges())for(const n of t.getItems())if(e.checkAttribute(n,this.attributeKey))return n.hasAttribute(this.attributeKey);return!1}}const lh="bold";class dh extends Kc{init(){const t=this.editor;t.model.schema.extend("$text",{allowAttributes:lh}),t.conversion.attributeToElement({model:lh,view:"strong",upcastAlso:["b",{styles:{"font-weight":"bold"}}]}),t.commands.add(lh,new ch(t,lh)),t.keystrokes.set("CTRL+B",lh)}}var hh=n(47),uh=n.n(hh);const fh="bold";class ph extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add(fh,n=>{const o=t.commands.get(fh),i=new qd(n);return i.set({label:e("d"),icon:uh.a,keystroke:"CTRL+B",tooltip:!0}),i.bind("isOn","isEnabled").to(o,"value","isEnabled"),this.listenTo(i,"execute",()=>t.execute(fh)),i})}}const gh="italic";class mh extends Kc{init(){const t=this.editor;t.model.schema.extend("$text",{allowAttributes:gh}),t.conversion.attributeToElement({model:gh,view:"i",upcastAlso:["em",{styles:{"font-style":"italic"}}]}),t.commands.add(gh,new ch(t,gh)),t.keystrokes.set("CTRL+I",gh)}}var bh=n(46),wh=n.n(bh);const _h="italic";class vh extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add(_h,n=>{const o=t.commands.get(_h),i=new qd(n);return i.set({label:e("e"),icon:wh.a,keystroke:"CTRL+I",tooltip:!0}),i.bind("isOn","isEnabled").to(o,"value","isEnabled"),this.listenTo(i,"execute",()=>t.execute(_h)),i})}}const kh="underline";class yh extends Kc{init(){const t=this.editor;t.model.schema.extend("$text",{allowAttributes:kh}),t.conversion.attributeToElement({model:kh,view:"u",upcastAlso:{styles:{"text-decoration":"underline"}}}),t.commands.add(kh,new ch(t,kh)),t.keystrokes.set("CTRL+U","underline")}}var xh=n(45),Ah=n.n(xh);const Ch="underline";class Ph extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add(Ch,n=>{const o=t.commands.get(Ch),i=new qd(n);return i.set({label:e("f"),icon:Ah.a,keystroke:"CTRL+U",tooltip:!0}),i.bind("isOn","isEnabled").to(o,"value","isEnabled"),this.listenTo(i,"execute",()=>t.execute(Ch)),i})}}const Th="strikethrough";class Sh extends Kc{init(){const t=this.editor;t.model.schema.extend("$text",{allowAttributes:Th}),t.conversion.attributeToElement({model:Th,view:"s",upcastAlso:["del","strike",{styles:{"text-decoration":"line-through"}}]}),t.commands.add(Th,new ch(t,Th)),t.keystrokes.set("CTRL+SHIFT+X","strikethrough")}}var Eh=n(44),Rh=n.n(Eh);const Oh="strikethrough";class Ih extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add(Oh,n=>{const o=t.commands.get(Oh),i=new qd(n);return i.set({label:e("g"),icon:Rh.a,keystroke:"CTRL+SHIFT+X",tooltip:!0}),i.bind("isOn","isEnabled").to(o,"value","isEnabled"),this.listenTo(i,"execute",()=>t.execute(Oh)),i})}}const Vh="code";class Mh extends Kc{init(){const t=this.editor;t.model.schema.extend("$text",{allowAttributes:Vh}),t.conversion.attributeToElement({model:Vh,view:"code",upcastAlso:{styles:{"word-wrap":"break-word"}}}),t.commands.add(Vh,new ch(t,Vh))}}var Nh=n(43),Bh=n.n(Nh);n(17);const Fh="code";class Dh extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add(Fh,n=>{const o=t.commands.get(Fh),i=new qd(n);return i.set({label:e("h"),icon:Bh.a,tooltip:!0}),i.bind("isOn","isEnabled").to(o,"value","isEnabled"),this.listenTo(i,"execute",()=>t.execute(Fh)),i})}}function Lh(t){const e=t.next();return e.done?null:e.value}class zh extends Ql{refresh(){this.value=this._getValue(),this.isEnabled=this._checkEnabled()}execute(){const t=this.editor.model,e=t.document,n=t.schema,o=Array.from(e.selection.getSelectedBlocks());t.change(t=>{if(this.value)this._removeQuote(t,o.filter(jh));else{const e=o.filter(t=>jh(t)||Hh(n,t));this._applyQuote(t,e)}})}_getValue(){const t=Lh(this.editor.model.document.selection.getSelectedBlocks());return!(!t||!jh(t))}_checkEnabled(){if(this.value)return!0;const t=this.editor.model.document.selection,e=this.editor.model.schema,n=Lh(t.getSelectedBlocks());return!!n&&Hh(e,n)}_removeQuote(t,e){qh(t,e).reverse().forEach(e=>{if(e.start.isAtStart&&e.end.isAtEnd)return void t.unwrap(e.start.parent);if(e.start.isAtStart){const n=t.createPositionBefore(e.start.parent);return void t.move(e,n)}e.end.isAtEnd||t.split(e.end);const n=t.createPositionAfter(e.end.parent);t.move(e,n)})}_applyQuote(t,e){const n=[];qh(t,e).reverse().forEach(e=>{let o=jh(e.start);o||(o=t.createElement("blockQuote"),t.wrap(e,o)),n.push(o)}),n.reverse().reduce((e,n)=>e.nextSibling==n?(t.merge(t.createPositionAfter(e)),e):n)}}function jh(t){return"blockQuote"==t.parent.name?t.parent:null}function qh(t,e){let n,o=0;const i=[];for(;o{if(t.endsWith("blockQuote")&&"blockQuote"==e.name)return!1}),t.conversion.elementToElement({model:"blockQuote",view:"blockquote"}),t.model.document.registerPostFixer(n=>{const o=t.model.document.differ.getChanges();for(const t of o)if("insert"==t.type){const o=t.position.nodeAfter;if(!o)continue;if(o.is("blockQuote")&&o.isEmpty)return n.remove(o),!0;if(o.is("blockQuote")&&!e.checkChild(t.position,o))return n.unwrap(o),!0;if(o.is("element")){const t=n.createRangeIn(o);for(const o of t.getItems())if(o.is("blockQuote")&&!e.checkChild(n.createPositionBefore(o),o))return n.unwrap(o),!0}}else if("remove"==t.type){const e=t.position.parent;if(e.is("blockQuote")&&e.isEmpty)return n.remove(e),!0}return!1})}afterInit(){const t=this.editor.commands.get("blockQuote");this.listenTo(this.editor.editing.view.document,"enter",(e,n)=>{const o=this.editor.model.document,i=o.selection.getLastPosition().parent;o.selection.isCollapsed&&i.isEmpty&&t.value&&(this.editor.execute("blockQuote"),this.editor.editing.view.scrollToTheSelection(),n.preventDefault(),e.stop())})}}var Wh=n(42),$h=n.n(Wh);n(103);class Kh extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add("blockQuote",n=>{const o=t.commands.get("blockQuote"),i=new qd(n);return i.set({label:e("i"),icon:$h.a,tooltip:!0}),i.bind("isOn","isEnabled").to(o,"value","isEnabled"),this.listenTo(i,"execute",()=>t.execute("blockQuote")),i})}}var Gh=n(41),Jh=n.n(Gh);class Qh extends Kc{static get pluginName(){return"CKFinderUI"}init(){const t=this.editor,e=t.ui.componentFactory,n=t.t;e.add("ckfinder",e=>{const o=t.commands.get("ckfinder"),i=new qd(e);return i.set({label:n("j"),icon:Jh.a,tooltip:!0}),i.bind("isEnabled").to(o),i.on("execute",()=>{t.execute("ckfinder"),t.editing.view.focus()}),i})}}class Xh extends Kc{static get pluginName(){return"Notification"}init(){this.on("show:warning",(t,e)=>{window.alert(e.message)},{priority:"lowest"})}showSuccess(t,e={}){this._showNotification({message:t,type:"success",namespace:e.namespace,title:e.title})}showInfo(t,e={}){this._showNotification({message:t,type:"info",namespace:e.namespace,title:e.title})}showWarning(t,e={}){this._showNotification({message:t,type:"warning",namespace:e.namespace,title:e.title})}_showNotification(t){const e=`show:${t.type}`+(t.namespace?`:${t.namespace}`:"");this.fire(e,{message:t.message,type:t.type,title:t.title||""})}}class Yh extends Ql{constructor(t){super(t),this.stopListening(this.editor.model.document,"change"),this.listenTo(this.editor.model.document,"change",()=>this.refresh(),{priority:"low"})}refresh(){const t=this.editor.commands.get("imageUpload"),e=this.editor.commands.get("link");this.isEnabled=t&&e&&(t.isEnabled||e.isEnabled)}execute(){const t=this.editor,e=this.editor.config.get("ckfinder.openerMethod")||"modal";if("popup"!=e&&"modal"!=e)throw new T.b('ckfinder-unknown-openerMethod: The openerMethod config option must by "popup" or "modal".');const n=Object.assign({},this.editor.config.get("ckfinder.options"));n.chooseFiles=!0;const o=n.onInit;n.language||(n.language=t.locale.language),n.onInit=(e=>{o&&o(),e.on("files:choose",n=>{const o=n.data.files.toArray(),i=o.filter(t=>!t.isImage()),r=o.filter(t=>t.isImage());for(const e of i)t.execute("link",e.getUrl());const s=[];for(const t of r){const n=t.getUrl();s.push(n||e.request("file:getProxyUrl",{file:t}))}s.length&&Zh(t,s)}),e.on("file:choose:resizedImage",e=>{const n=e.data.resizedUrl;if(n)Zh(t,[n]);else{const e=t.plugins.get(Xh),n=t.locale.t;e.showWarning(n("au"),{title:n("av"),namespace:"ckfinder"})}})}),window.CKFinder[e](n)}}function Zh(t,e){if(t.commands.get("imageUpload").isEnabled)t.execute("imageInsert",{source:e});else{const e=t.plugins.get(Xh),n=t.locale.t;e.showWarning(n("aw"),{title:n("ax"),namespace:"ckfinder"})}}class tu extends Kc{static get pluginName(){return"CKFinderEditing"}static get requires(){return[Xh]}init(){const t=this.editor;t.commands.add("ckfinder",new Yh(t))}}const eu=/^data:(\S*?);base64,/;class nu{constructor(t,e,n){if(!t)throw new Error("File must be provided");if(!e)throw new Error("Token must be provided");if(!n)throw new Error("Api address must be provided");this.file=function(t){if("string"!=typeof t)return!1;const e=t.match(eu);return!(!e||!e.length)}(t)?function(t,e=512){try{const n=t.match(eu)[1],o=atob(t.replace(eu,"")),i=[];for(let t=0;tt(n)),this}onError(t){return this.once("error",(e,n)=>t(n)),this}abort(){this.xhr.abort()}send(){return this._prepareRequest(),this._attachXHRListeners(),this._sendRequest()}_prepareRequest(){const t=new XMLHttpRequest;t.open("POST",this._apiAddress),t.setRequestHeader("Authorization",this._token.value),t.responseType="json",this.xhr=t}_attachXHRListeners(){const t=this,e=this.xhr;function n(e){return()=>t.fire("error",e)}e.addEventListener("error",n("Network Error")),e.addEventListener("abort",n("Abort")),e.upload&&e.upload.addEventListener("progress",t=>{t.lengthComputable&&this.fire("progress",{total:t.total,uploaded:t.loaded})}),e.addEventListener("load",()=>{const t=e.status,n=e.response;if(t<200||t>299)return this.fire("error",n.message||n.error)})}_sendRequest(){const t=new FormData,e=this.xhr;return t.append("file",this.file),new Promise((n,o)=>{e.addEventListener("load",()=>{const t=e.status,i=e.response;return t<200||t>299?i.message?o(new Error(i.message)):o(i.error):n(i)}),e.addEventListener("error",()=>o(new Error("Network Error"))),e.addEventListener("abort",()=>o(new Error("Abort"))),e.send(t)})}}j(nu,M);var ou=nu;const iu={refreshInterval:36e5,autoRefresh:!0};class ru{constructor(t,e=iu){if(!t)throw new Error("A `tokenUrl` must be provided as the first constructor argument.");this.set("value",e.initValue),this._refresh="function"==typeof t?t:()=>(function(t){return new Promise((e,n)=>{const o=new XMLHttpRequest;o.open("GET",t),o.addEventListener("load",()=>{const t=o.status,i=o.response;return t<200||t>299?n(new Error("Cannot download new token!")):e(i)}),o.addEventListener("error",()=>n(new Error("Network Error"))),o.addEventListener("abort",()=>n(new Error("Abort"))),o.send()})})(t),this._options=Object.assign({},iu,e)}init(){return new Promise((t,e)=>{this._options.autoRefresh&&this._startRefreshing(),this.value?t(this):this._refreshToken().then(t).catch(e)})}_refreshToken(){return this._refresh().then(t=>this.set("value",t)).then(()=>this)}destroy(){this._stopRefreshing()}_startRefreshing(){this._refreshInterval=setInterval(()=>this._refreshToken(),this._options.refreshInterval)}_stopRefreshing(){clearInterval(this._refreshInterval)}static create(t,e=iu){return new ru(t,e).init()}}j(ru,Fo);var su=ru;class au extends Kc{static get pluginName(){return"CloudServices"}init(){const t=this.editor.config.get("cloudServices")||{};for(const e in t)this[e]=t[e];if(this.tokenUrl)return this.token=new au.Token(this.tokenUrl),this.token.init();this.token=null}}au.Token=su;class cu extends Kc{static get requires(){return[Xd,au]}init(){const t=this.editor,e=t.plugins.get(au),n=e.token,o=e.uploadUrl;n&&(this._uploadGateway=new cu._UploadGateway(n,o),t.plugins.get(Xd).createUploadAdapter=(t=>new lu(this._uploadGateway,t)))}}class lu{constructor(t,e){this.uploadGateway=t,this.loader=e}upload(){return this.fileUploader=this.uploadGateway.upload(this.loader.file),this.fileUploader.on("progress",(t,e)=>{this.loader.uploadTotal=e.total,this.loader.uploaded=e.uploaded}),this.fileUploader.send()}abort(){this.fileUploader.abort()}}cu._UploadGateway=class{constructor(t,e){if(!t)throw new Error("Token must be provided");if(!e)throw new Error("Api address must be provided");this._token=t,this._apiAddress=e}upload(t){return new ou(t,this._token,this._apiAddress)}};class du extends cr{constructor(t){super(t),this._observedElements=new Set}observe(t,e){this.document.getRoot(e).on("change:children",(e,n)=>{this.view.once("render",()=>this._updateObservedElements(t,n))})}_updateObservedElements(t,e){if(!e.is("element")||e.is("attributeElement"))return;const n=this.view.domConverter.mapViewToDom(e);if(n){for(const t of n.querySelectorAll("img"))this._observedElements.has(t)||(this.listenTo(t,"load",(t,e)=>this._fireEvents(e)),this._observedElements.add(t));for(const e of this._observedElements)t.contains(e)||(this.stopListening(e),this._observedElements.delete(e))}}_fireEvents(t){this.isEnabled&&(this.document.fire("layoutChanged"),this.document.fire("imageLoaded",t))}destroy(){this._observedElements.clear(),super.destroy()}}function hu(t){return n=>{n.on(`attribute:${t}:image`,e)};function e(t,e,n){if(!n.consumable.consume(e.item,t.name))return;const o=n.writer,i=n.mapper.toViewElement(e.item).getChild(0);null!==e.attributeNewValue?o.setAttribute(e.attributeKey,e.attributeNewValue,i):o.removeAttribute(e.attributeKey,i)}}class uu{constructor(){this._stack=[]}add(t,e){const n=this._stack,o=n[0];this._insertDescriptor(t);const i=n[0];o===i||fu(o,i)||this.fire("change:top",{oldDescriptor:o,newDescriptor:i,writer:e})}remove(t,e){const n=this._stack,o=n[0];this._removeDescriptor(t);const i=n[0];o===i||fu(o,i)||this.fire("change:top",{oldDescriptor:o,newDescriptor:i,writer:e})}_insertDescriptor(t){const e=this._stack,n=e.findIndex(e=>e.id===t.id);if(fu(t,e[n]))return;n>-1&&e.splice(n,1);let o=0;for(;e[o]&&pu(e[o],t);)o++;e.splice(o,0,t)}_removeDescriptor(t){const e=this._stack,n=e.findIndex(e=>e.id===t);n>-1&&e.splice(n,1)}}function fu(t,e){return t&&e&&t.priority==e.priority&&gu(t.classes)==gu(e.classes)}function pu(t,e){return t.priority>e.priority||!(t.prioritygu(e.classes)}function gu(t){return Array.isArray(t)?t.sort().join(","):t}j(uu,M);var mu=n(40),bu=n.n(mu);const wu=Symbol("isWidget"),_u=Symbol("label"),vu="ck-widget",ku="ck-widget_selected";function yu(t){return!!t.is("element")&&!!t.getCustomProperty(wu)}function xu(t,e,n={}){return li.isEdge||e.setAttribute("contenteditable","false",t),e.addClass(vu,t),e.setCustomProperty(wu,!0,t),t.getFillerOffset=Tu,n.label&&function(t,e,n){n.setCustomProperty(_u,e,t)}(t,n.label,e),n.hasSelectionHandler&&function(t,e){const n=e.createUIElement("div",{class:"ck ck-widget__selection-handler"},function(t){const e=this.toDomElement(t),n=new zd;return n.set("content",bu.a),n.render(),e.appendChild(n.element),e});e.insert(e.createPositionAt(t,0),n),e.addClass(["ck-widget_selectable"],t)}(t,e),function(t,e,n,o){const i=new uu;i.on("change:top",(e,i)=>{i.oldDescriptor&&o(t,i.oldDescriptor,i.writer),i.newDescriptor&&n(t,i.newDescriptor,i.writer)}),e.setCustomProperty("addHighlight",(t,e,n)=>i.add(e,n),t),e.setCustomProperty("removeHighlight",(t,e,n)=>i.remove(e,n),t)}(t,e,(t,e,n)=>n.addClass(o(e.classes),t),(t,e,n)=>n.removeClass(o(e.classes),t)),t;function o(t){return Array.isArray(t)?t:[t]}}function Au(t){const e=t.getCustomProperty(_u);return e?"function"==typeof e?e():e:""}function Cu(t,e){return e.addClass(["ck-editor__editable","ck-editor__nested-editable"],t),li.isEdge||(e.setAttribute("contenteditable",t.isReadOnly?"false":"true",t),t.on("change:isReadOnly",(n,o,i)=>{e.setAttribute("contenteditable",i?"false":"true",t)})),t.on("change:isFocused",(n,o,i)=>{i?e.addClass("ck-editor__nested-editable_focused",t):e.removeClass("ck-editor__nested-editable_focused",t)}),t}function Pu(t,e){const n=t.getSelectedElement();if(n)return e.createPositionAfter(n);const o=t.getSelectedBlocks().next().value;if(o){if(o.isEmpty)return e.createPositionAt(o,0);const n=e.createPositionAfter(o);return t.focus.isTouching(n)?n:e.createPositionBefore(o)}return t.focus}function Tu(){return null}const Su=Symbol("isImage");function Eu(t){const e=t.getSelectedElement();return!(!e||!function(t){return!!t.getCustomProperty(Su)&&yu(t)}(e))}function Ru(t){return!!t&&t.is("image")}function Ou(t,e,n={}){const o=t.createElement("image",n),i=Pu(e.document.selection,e);e.insertContent(o,i),o.parent&&t.setSelection(o,"on")}function Iu(t){const e=t.schema,n=t.document.selection;return function(t,e,n){const o=function(t,e){let n=Pu(t,e).parent;n.is("$root")||(n=n.parent);return n}(t,n);return e.checkChild(o,"image")}(n,e,t)&&function(t,e){const n=t.getSelectedElement(),o=!!n&&e.isObject(n),i=!![...t.focus.getAncestors()].find(t=>e.isObject(t));return!o&&!i}(n,e)}class Vu extends Ql{refresh(){this.isEnabled=Iu(this.editor.model)}execute(t){const e=this.editor.model;e.change(n=>{const o=Array.isArray(t.source)?t.source:[t.source];for(const t of o)Ou(n,e,{src:t})})}}class Mu extends Kc{init(){const t=this.editor,e=t.model.schema,n=t.t,o=t.conversion;t.editing.view.addObserver(du),e.register("image",{isObject:!0,isBlock:!0,allowWhere:"$block",allowAttributes:["alt","src","srcset"]}),o.for("dataDowncast").add(aa({model:"image",view:(t,e)=>Nu(e)})),o.for("editingDowncast").add(aa({model:"image",view:(t,e)=>(function(t,e,n){return e.setCustomProperty(Su,!0,t),xu(t,e,{label:function(){const e=t.getChild(0).getAttribute("alt");return e?`${e} ${n}`:n}})})(Nu(e),e,n("m"))})),o.for("downcast").add(hu("src")).add(hu("alt")).add(function(){return e=>{e.on("attribute:srcset:image",t)};function t(t,e,n){if(!n.consumable.consume(e.item,t.name))return;const o=n.writer,i=n.mapper.toViewElement(e.item).getChild(0);if(null===e.attributeNewValue){const t=e.attributeOldValue;t.data&&(o.removeAttribute("srcset",i),o.removeAttribute("sizes",i),t.width&&o.removeAttribute("width",i))}else{const t=e.attributeNewValue;t.data&&(o.setAttribute("srcset",t.data,i),o.setAttribute("sizes","100vw",i),t.width&&o.setAttribute("width",t.width,i))}}}()),o.for("upcast").add(Va({view:{name:"img",attributes:{src:!0}},model:(t,e)=>e.createElement("image",{src:t.getAttribute("src")})})).add(Na({view:{name:"img",key:"alt"},model:"alt"})).add(Na({view:{name:"img",key:"srcset"},model:{key:"srcset",value:t=>{const e={data:t.getAttribute("srcset")};return t.hasAttribute("width")&&(e.width=t.getAttribute("width")),e}}})).add(function(){return e=>{e.on("element:figure",t)};function t(t,e,n){if(!n.consumable.test(e.viewItem,{name:!0,classes:"image"}))return;const o=Array.from(e.viewItem.getChildren()).find(t=>t.is("img"));if(!o||!o.hasAttribute("src")||!n.consumable.test(o,{name:!0}))return;const i=n.convertItem(o,e.modelCursor),r=Lh(i.modelRange.getItems());r&&(n.convertChildren(e.viewItem,n.writer.createPositionAt(r,0)),e.modelRange=i.modelRange,e.modelCursor=i.modelCursor)}}()),t.commands.add("imageInsert",new Vu(t))}}function Nu(t){const e=t.createEmptyElement("img"),n=t.createContainerElement("figure",{class:"image"});return t.insert(t.createPositionAt(n,0),e),n}class Bu extends Qr{constructor(t){super(t),this.domEventType="mousedown"}onDomEvent(t){this.fire(t.type,t)}}n(101);const Fu=pi("Ctrl+A");class Du extends Kc{static get pluginName(){return"Widget"}init(){const t=this.editor.editing.view,e=t.document;this._previouslySelected=new Set,this.editor.editing.downcastDispatcher.on("selection",(t,e,n)=>{this._clearPreviouslySelectedWidgets(n.writer);const o=n.writer,i=o.document.selection,r=i.getSelectedElement();let s=null;for(const t of i.getRanges())for(const e of t){const t=e.item;yu(t)&&!Lu(t,s)&&(o.addClass(ku,t),this._previouslySelected.add(t),s=t,t==r&&o.setSelection(i.getRanges(),{fake:!0,label:Au(r)}))}},{priority:"low"}),t.addObserver(Bu),this.listenTo(e,"mousedown",(...t)=>this._onMousedown(...t)),this.listenTo(e,"keydown",(...t)=>this._onKeydown(...t),{priority:"high"}),this.listenTo(e,"delete",(t,e)=>{this._handleDelete("forward"==e.direction)&&(e.preventDefault(),t.stop())},{priority:"high"})}_onMousedown(t,e){const n=this.editor,o=n.editing.view,i=o.document;let r=e.target;if(function(t){for(;t;){if(t&&t.is("editableElement")&&!t.is("rootElement"))return!0;t=t.parent}return!1}(r))return;if(!yu(r)&&!(r=r.findAncestor(yu)))return;e.preventDefault(),i.isFocused||o.focus();const s=n.editing.mapper.toModelElement(r);this._setSelectionOverElement(s)}_onKeydown(t,e){const n=e.keyCode,o=n==ui.delete||n==ui.arrowdown||n==ui.arrowright;let i=!1;!function(t){return t==ui.arrowright||t==ui.arrowleft||t==ui.arrowup||t==ui.arrowdown}(n)?!function(t){return fi(t)==Fu}(e)?n===ui.enter&&(i=this._handleEnterKey(e.shiftKey)):i=this._selectAllNestedEditableContent()||this._selectAllContent():i=this._handleArrowKeys(o),i&&(e.preventDefault(),t.stop())}_handleDelete(t){if(this.editor.isReadOnly)return;const e=this.editor.model.document.selection;if(!e.isCollapsed)return;const n=this._getObjectElementNextToSelection(t);return n?(this.editor.model.change(t=>{let o=e.anchor.parent;for(;o.isEmpty;){const e=o;o=e.parent,t.remove(e)}this._setSelectionOverElement(n)}),!0):void 0}_handleArrowKeys(t){const e=this.editor.model,n=e.schema,o=e.document.selection,i=o.getSelectedElement();if(i&&n.isObject(i)){const i=t?o.getLastPosition():o.getFirstPosition(),r=n.getNearestSelectionRange(i,t?"forward":"backward");return r&&e.change(t=>{t.setSelection(r)}),!0}if(!o.isCollapsed)return;const r=this._getObjectElementNextToSelection(t);return r&&n.isObject(r)?(this._setSelectionOverElement(r),!0):void 0}_handleEnterKey(t){const e=this.editor.model,n=e.document.selection.getSelectedElement();if(n&&e.schema.isObject(n))return e.change(e=>{const o=e.createElement("paragraph");e.insert(o,n,t?"before":"after"),e.setSelection(o,"in")}),!0}_selectAllNestedEditableContent(){const t=this.editor.model,e=t.document.selection,n=t.schema.getLimitElement(e);return e.getFirstRange().root!=n&&(t.change(t=>{t.setSelection(t.createRangeIn(n))}),!0)}_selectAllContent(){const t=this.editor.model,e=this.editor.editing,n=e.view.document.selection.getSelectedElement();if(n&&yu(n)){const o=e.mapper.toModelElement(n.parent);return t.change(t=>{t.setSelection(t.createRangeIn(o))}),!0}return!1}_setSelectionOverElement(t){this.editor.model.change(e=>{e.setSelection(e.createRangeOn(t))})}_getObjectElementNextToSelection(t){const e=this.editor.model,n=e.schema,o=e.document.selection,i=e.createSelection(o);e.modifySelection(i,{direction:t?"forward":"backward"});const r=t?i.focus.nodeBefore:i.focus.nodeAfter;return r&&n.isObject(r)?r:null}_clearPreviouslySelectedWidgets(t){for(const e of this._previouslySelected)t.removeClass(ku,e);this._previouslySelected.clear()}}function Lu(t,e){return!!e&&Array.from(t.getAncestors()).includes(e)}class zu extends Ql{refresh(){const t=this.editor.model.document.selection.getSelectedElement();this.isEnabled=Ru(t),Ru(t)&&t.hasAttribute("alt")?this.value=t.getAttribute("alt"):this.value=!1}execute(t){const e=this.editor.model,n=e.document.selection.getSelectedElement();e.change(e=>{e.setAttribute("alt",t.newValue,n)})}}class ju extends Kc{init(){this.editor.commands.add("imageTextAlternative",new zu(this.editor))}}function qu({emitter:t,activator:e,callback:n,contextElements:o}){t.listenTo(document,"mousedown",(t,{target:i})=>{if(e()){for(const t of o)if(t.contains(i))return;n()}})}n(99);class Hu extends bl{constructor(t){super(t),this.set("text"),this.set("for");const e=this.bindTemplate;this.setTemplate({tag:"label",attributes:{class:["ck","ck-label"],for:e.to("for")},children:[{text:e.to("text")}]})}}n(97);class Uu extends bl{constructor(t,e){super(t);const n=`ck-input-${R()}`,o=`ck-status-${R()}`;this.set("label"),this.set("value"),this.set("isReadOnly",!1),this.set("errorText",null),this.set("infoText",null),this.labelView=this._createLabelView(n),this.inputView=this._createInputView(e,n,o),this.statusView=this._createStatusView(o),this.bind("_statusText").to(this,"errorText",this,"infoText",(t,e)=>t||e);const i=this.bindTemplate;this.setTemplate({tag:"div",attributes:{class:["ck","ck-labeled-input",i.if("isReadOnly","ck-disabled")]},children:[this.labelView,this.inputView,this.statusView]})}_createLabelView(t){const e=new Hu(this.locale);return e.for=t,e.bind("text").to(this,"label"),e}_createInputView(t,e,n){const o=new t(this.locale,n);return o.id=e,o.ariaDesribedById=n,o.bind("value").to(this),o.bind("isReadOnly").to(this),o.bind("hasError").to(this,"errorText",t=>!!t),o.on("input",()=>{this.errorText=null}),o}_createStatusView(t){const e=new bl(this.locale),n=this.bindTemplate;return e.setTemplate({tag:"div",attributes:{class:["ck","ck-labeled-input__status",n.if("errorText","ck-labeled-input__status_error"),n.if("_statusText","ck-hidden",t=>!t)],id:t},children:[{text:n.to("_statusText")}]}),e}select(){this.inputView.select()}focus(){this.inputView.focus()}}n(95);class Wu extends bl{constructor(t){super(t),this.set("value"),this.set("id"),this.set("placeholder"),this.set("isReadOnly",!1),this.set("hasError",!1),this.set("ariaDesribedById");const e=this.bindTemplate;this.setTemplate({tag:"input",attributes:{type:"text",class:["ck","ck-input","ck-input-text",e.if("hasError","ck-error")],id:e.to("id"),placeholder:e.to("placeholder"),readonly:e.to("isReadOnly"),"aria-invalid":e.if("hasError",!0),"aria-describedby":e.to("ariaDesribedById")},on:{input:e.to("input")}})}render(){super.render();const t=t=>{this.element.value=t||0===t?t:""};t(this.value),this.on("change:value",(e,n,o)=>{t(o)})}select(){this.element.select()}focus(){this.element.focus()}}function $u({view:t}){t.listenTo(t.element,"submit",(e,n)=>{n.preventDefault(),t.fire("submit")},{useCapture:!0})}var Ku=n(8),Gu=n.n(Ku),Ju=n(7),Qu=n.n(Ju);n(93);class Xu extends bl{constructor(t){super(t);const e=this.locale.t;this.focusTracker=new El,this.keystrokes=new qc,this.labeledInput=this._createLabeledInputView(),this.saveButtonView=this._createButton(e("bc"),Gu.a,"ck-button-save"),this.saveButtonView.type="submit",this.cancelButtonView=this._createButton(e("bd"),Qu.a,"ck-button-cancel","cancel"),this._focusables=new Gc,this._focusCycler=new Rl({focusables:this._focusables,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"shift + tab",focusNext:"tab"}}),this.setTemplate({tag:"form",attributes:{class:["ck","ck-text-alternative-form"],tabindex:"-1"},children:[this.labeledInput,this.saveButtonView,this.cancelButtonView]})}render(){super.render(),this.keystrokes.listenTo(this.element),$u({view:this}),[this.labeledInput,this.saveButtonView,this.cancelButtonView].forEach(t=>{this._focusables.add(t),this.focusTracker.add(t.element)})}_createButton(t,e,n,o){const i=new qd(this.locale);return i.set({label:t,icon:e,tooltip:!0}),i.extendTemplate({attributes:{class:n}}),o&&i.delegate("execute").to(this,o),i}_createLabeledInputView(){const t=this.locale.t,e=new Uu(this.locale,Wu);return e.label=t("be"),e.inputView.placeholder=t("be"),e}}var Yu=n(39),Zu=n.n(Yu);function tf(t){const e=t.editing.view,n=Al.defaultPositions;return{target:e.domConverter.viewToDom(e.document.selection.getSelectedElement()),positions:[n.northArrowSouth,n.northArrowSouthWest,n.northArrowSouthEast,n.southArrowNorth,n.southArrowNorthWest,n.southArrowNorthEast]}}class ef extends Kc{static get requires(){return[Sl]}init(){this._createButton(),this._createForm()}_createButton(){const t=this.editor,e=t.t;t.ui.componentFactory.add("imageTextAlternative",n=>{const o=t.commands.get("imageTextAlternative"),i=new qd(n);return i.set({label:e("ay"),icon:Zu.a,tooltip:!0}),i.bind("isEnabled").to(o,"isEnabled"),this.listenTo(i,"execute",()=>this._showForm()),i})}_createForm(){const t=this.editor,e=t.editing.view.document;this._balloon=this.editor.plugins.get("ContextualBalloon"),this._form=new Xu(t.locale),this._form.render(),this.listenTo(this._form,"submit",()=>{t.execute("imageTextAlternative",{newValue:this._form.labeledInput.inputView.element.value}),this._hideForm(!0)}),this.listenTo(this._form,"cancel",()=>{this._hideForm(!0)}),this._form.keystrokes.set("Esc",(t,e)=>{this._hideForm(!0),e()}),this.listenTo(t.ui,"update",()=>{Eu(e.selection)?this._isVisible&&function(t){const e=t.plugins.get("ContextualBalloon");if(Eu(t.editing.view.document.selection)){const n=tf(t);e.updatePosition(n)}}(t):this._hideForm(!0)}),qu({emitter:this._form,activator:()=>this._isVisible,contextElements:[this._form.element],callback:()=>this._hideForm()})}_showForm(){if(this._isVisible)return;const t=this.editor,e=t.commands.get("imageTextAlternative"),n=this._form.labeledInput;this._balloon.hasView(this._form)||this._balloon.add({view:this._form,position:tf(t)}),n.value=n.inputView.element.value=e.value||"",this._form.labeledInput.select()}_hideForm(t){this._isVisible&&(this._balloon.remove(this._form),t&&this.editor.editing.view.focus())}get _isVisible(){return this._balloon.visibleView==this._form}}class nf extends Kc{static get requires(){return[ju,ef]}static get pluginName(){return"ImageTextAlternative"}}n(91);class of extends Kc{static get requires(){return[Mu,Du,nf]}static get pluginName(){return"Image"}}class rf extends bl{constructor(t){super(t),this.buttonView=new qd(t),this._fileInputView=new sf(t),this._fileInputView.bind("acceptedType").to(this),this._fileInputView.bind("allowMultipleFiles").to(this),this._fileInputView.delegate("done").to(this),this.setTemplate({tag:"span",attributes:{class:"ck-file-dialog-button"},children:[this.buttonView,this._fileInputView]}),this.buttonView.on("execute",()=>{this._fileInputView.open()})}focus(){this.buttonView.focus()}}class sf extends bl{constructor(t){super(t),this.set("acceptedType"),this.set("allowMultipleFiles",!1);const e=this.bindTemplate;this.setTemplate({tag:"input",attributes:{class:["ck-hidden"],type:"file",tabindex:"-1",accept:e.to("acceptedType"),multiple:e.to("allowMultipleFiles")},on:{change:e.to(()=>{this.element&&this.element.files&&this.element.files.length&&this.fire("done",this.element.files),this.element.value=""})}})}open(){this.element.click()}}var af=n(38),cf=n.n(af);function lf(t){return/^image\/(jpeg|png|gif|bmp)$/.test(t.type)}function df(t){return new Promise(e=>{fetch(t.getAttribute("src")).then(t=>t.blob()).then(n=>{const o=function(t,e){return t.type?t.type:e.match(/data:(image\/\w+);base64/)?e.match(/data:(image\/\w+);base64/)[1].toLowerCase():"image/jpeg"}(n,t.getAttribute("src")),i=function(t,e,n){try{return new File([t],e,{type:n})}catch(t){return null}}(n,`image.${o.replace("image/","")}`,o);e({image:t,file:i})}).catch(()=>{e({image:t,file:null})})})}class hf extends Kc{init(){const t=this.editor,e=t.t;t.ui.componentFactory.add("imageUpload",n=>{const o=new rf(n),i=t.commands.get("imageUpload");return o.set({acceptedType:"image/*",allowMultipleFiles:!0}),o.buttonView.set({label:e("v"),icon:cf.a,tooltip:!0}),o.buttonView.bind("isEnabled").to(i),o.on("done",(e,n)=>{const o=Array.from(n).filter(lf);o.length&&t.execute("imageUpload",{file:o})}),o})}}var uf=n(37),ff=n.n(uf);n(89),n(87),n(85);class pf extends Kc{constructor(t){super(t),this.placeholder="data:image/svg+xml;utf8,"+encodeURIComponent(ff.a)}init(){this.editor.editing.downcastDispatcher.on("attribute:uploadStatus:image",(...t)=>this.uploadStatusChange(...t))}uploadStatusChange(t,e,n){const o=this.editor,i=e.item,r=i.getAttribute("uploadId");if(!n.consumable.consume(e.item,t.name))return;const s=o.plugins.get(Xd),a=r?e.attributeNewValue:null,c=this.placeholder,l=o.editing.mapper.toViewElement(i),d=n.writer;if("reading"==a)return bf(l,d),void wf(c,l,d);if("uploading"==a){const t=s.loaders.get(r);return bf(l,d),void(t?(_f(l,d),function(t,e,n,o){const i=function(t){const e=t.createUIElement("div",{class:"ck-progress-bar"});return t.setCustomProperty(gf,!0,e),e}(e);e.insert(e.createPositionAt(t,"end"),i),n.on("change:uploadedPercent",(t,e,n)=>{o.change(t=>{t.setStyle("width",n+"%",i)})})}(l,d,t,o.editing.view)):wf(c,l,d))}"complete"==a&&s.loaders.get(r)&&!li.isEdge&&function(t,e,n){const o=e.createUIElement("div",{class:"ck-image-upload-complete-icon"});e.insert(e.createPositionAt(t,"end"),o),setTimeout(()=>{n.change(t=>t.remove(t.createRangeOn(o)))},3e3)}(l,d,o.editing.view),function(t,e){kf(t,e,gf)}(l,d),_f(l,d),function(t,e){e.removeClass("ck-appear",t)}(l,d)}}const gf=Symbol("progress-bar"),mf=Symbol("placeholder");function bf(t,e){t.hasClass("ck-appear")||e.addClass("ck-appear",t)}function wf(t,e,n){e.hasClass("ck-image-upload-placeholder")||n.addClass("ck-image-upload-placeholder",e);const o=e.getChild(0);o.getAttribute("src")!==t&&n.setAttribute("src",t,o),vf(e,mf)||n.insert(n.createPositionAfter(o),function(t){const e=t.createUIElement("div",{class:"ck-upload-placeholder-loader"});return t.setCustomProperty(mf,!0,e),e}(n))}function _f(t,e){t.hasClass("ck-image-upload-placeholder")&&e.removeClass("ck-image-upload-placeholder",t),kf(t,e,mf)}function vf(t,e){for(const n of t.getChildren())if(n.getCustomProperty(e))return n}function kf(t,e,n){const o=vf(t,n);o&&e.remove(e.createRangeOn(o))}class yf{createDocumentFragment(t){return new _i(t)}createElement(t,e,n){return new go(t,e,n)}createText(t){return new co(t)}clone(t,e=!1){return t._clone(e)}appendChild(t,e){return e._appendChild(t)}insertChild(t,e,n){return n._insertChild(t,e)}removeChildren(t,e,n){return n._removeChildren(t,e)}remove(t){const e=t.parent;return e?this.removeChildren(e.getChildIndex(t),1,e):[]}replace(t,e){const n=t.parent;if(n){const o=n.getChildIndex(t);return this.removeChildren(o,1,n),this.insertChild(o,e,n),!0}return!1}rename(t,e){const n=new go(t,e.getAttributes(),e.getChildren());return this.replace(e,n)?n:null}setAttribute(t,e,n){n._setAttribute(t,e)}removeAttribute(t,e){e._removeAttribute(t)}addClass(t,e){e._addClass(t)}removeClass(t,e){e._removeClass(t)}setStyle(t,e,n){C(t)&&void 0===n&&(n=e),n._setStyle(t,e)}removeStyle(t,e){e._removeStyle(t)}setCustomProperty(t,e,n){n._setCustomProperty(t,e)}removeCustomProperty(t,e){return e._removeCustomProperty(t)}createPositionAt(t,e){return Go._createAt(t,e)}createPositionAfter(t){return Go._createAfter(t)}createPositionBefore(t){return Go._createBefore(t)}createRange(t,e){return new Jo(t,e)}createRangeOn(t){return Jo._createOn(t)}createRangeIn(t){return Jo._createIn(t)}createSelection(t,e,n){return new Yo(t,e,n)}}class xf extends Ql{refresh(){this.isEnabled=Iu(this.editor.model)}execute(t){const e=this.editor,n=e.model,o=e.plugins.get(Xd);n.change(e=>{const i=Array.isArray(t.file)?t.file:[t.file];for(const t of i)Af(e,n,o,t)})}}function Af(t,e,n,o){const i=n.createLoader(o);i&&Ou(t,e,{uploadId:i.id})}class Cf extends Kc{static get requires(){return[Xd,Xh]}init(){const t=this.editor,e=t.model.document,n=t.model.schema,o=t.conversion,i=t.plugins.get(Xd);n.extend("image",{allowAttributes:["uploadId","uploadStatus"]}),t.commands.add("imageUpload",new xf(t)),o.for("upcast").add(Na({view:{name:"img",key:"uploadId"},model:"uploadId"})),this.listenTo(t.editing.view.document,"clipboardInput",(e,n)=>{if(function(t){return Array.from(t.types).includes("text/html")&&""!==t.getData("text/html")}(n.dataTransfer))return;const o=Array.from(n.dataTransfer.files).filter(t=>!!t&&lf(t)),i=n.targetRanges.map(e=>t.editing.mapper.toModelRange(e));t.model.change(n=>{n.setSelection(i),o.length&&(e.stop(),t.model.enqueueChange("default",()=>{t.execute("imageUpload",{file:o})}))})}),this.listenTo(t.plugins.get("Clipboard"),"inputTransformation",(e,n)=>{const o=Array.from(t.editing.view.createRangeIn(n.content)).filter(t=>(function(t){return!(!t.is("element","img")||!t.getAttribute("src"))&&(t.getAttribute("src").match(/^data:image\/\w+;base64,/g)||t.getAttribute("src").match(/^blob:/g))})(t.item)&&!t.item.getAttribute("uploadProcessed")).map(t=>df(t.item));o.length&&(e.stop(),Promise.all(o).then(e=>{const o=new yf;for(const t of e)if(t.file){o.setAttribute("uploadProcessed",!0,t.image);const e=i.createLoader(t.file);e&&(o.setAttribute("src","",t.image),o.setAttribute("uploadId",e.id,t.image))}else o.remove(t.image);t.plugins.get("Clipboard").fire("inputTransformation",n)}))}),t.editing.view.document.on("dragover",(t,e)=>{e.preventDefault()}),e.on("change",()=>{const t=e.differ.getChanges({includeChangesInGraveyard:!0});for(const e of t)if("insert"==e.type&&"image"==e.name){const t=e.position.nodeAfter,n="$graveyard"==e.position.root.rootName,o=t.getAttribute("uploadId");if(!o)continue;const r=i.loaders.get(o);if(!r)continue;n?r.abort():"idle"==r.status&&this._readAndUpload(r,t)}})}_readAndUpload(t,e){const n=this.editor,o=n.model,i=n.locale.t,r=n.plugins.get(Xd),s=n.plugins.get(Xh);return o.enqueueChange("transparent",t=>{t.setAttribute("uploadStatus","reading",e)}),t.read().then(i=>{const r=n.editing.mapper.toViewElement(e).getChild(0),s=t.upload();return n.editing.view.change(t=>{t.setAttribute("src",i,r)}),o.enqueueChange("transparent",t=>{t.setAttribute("uploadStatus","uploading",e)}),s}).then(t=>{o.enqueueChange("transparent",n=>{n.setAttributes({uploadStatus:"complete",src:t.default},e),this._parseAndSetSrcsetAttributeOnImage(t,e,n)}),a()}).catch(n=>{if("error"!==t.status&&"aborted"!==t.status)throw n;"error"==t.status&&s.showWarning(n,{title:i("at"),namespace:"upload"}),a(),o.enqueueChange("transparent",t=>{t.remove(e)})});function a(){o.enqueueChange("transparent",t=>{t.removeAttribute("uploadId",e),t.removeAttribute("uploadStatus",e)}),r.destroyLoader(t)}}_parseAndSetSrcsetAttributeOnImage(t,e,n){let o=0;const i=Object.keys(t).filter(t=>{const e=parseInt(t,10);if(!isNaN(e))return o=Math.max(o,e),!0}).map(e=>`${t[e]} ${e}w`).join(", ");""!=i&&n.setAttribute("srcset",{data:i,width:o},e)}}class Pf extends Kc{static get pluginName(){return"ImageUpload"}static get requires(){return[Cf,hf,pf]}}class Tf extends Ql{refresh(){const t=this.editor.model,e=Lh(t.document.selection.getSelectedBlocks());this.value=!!e&&e.is("paragraph"),this.isEnabled=!!e&&Sf(e,t.schema)}execute(t={}){const e=this.editor.model,n=e.document;e.change(o=>{const i=(t.selection||n.selection).getSelectedBlocks();for(const t of i)!t.is("paragraph")&&Sf(t,e.schema)&&o.rename(t,"paragraph")})}}function Sf(t,e){return e.checkChild(t.parent,"paragraph")&&!e.isObject(t)}class Ef extends Kc{static get pluginName(){return"Paragraph"}init(){const t=this.editor,e=t.model,n=t.data;t.commands.add("paragraph",new Tf(t)),e.schema.register("paragraph",{inheritAllFrom:"$block"}),t.conversion.elementToElement({model:"paragraph",view:"p"}),n.upcastDispatcher.on("element",(t,e,n)=>{const o=n.writer;if(n.consumable.test(e.viewItem,{name:e.viewItem.name}))if(Ef.paragraphLikeElements.has(e.viewItem.name)){if(e.viewItem.isEmpty)return;const t=o.createElement("paragraph"),i=n.splitToAllowedParent(t,e.modelCursor);if(!i)return;o.insert(t,i.position);const{modelRange:r}=n.convertChildren(e.viewItem,o.createPositionAt(t,0));e.modelRange=o.createRange(o.createPositionBefore(t),r.end),e.modelCursor=e.modelRange.end}else Of(e.viewItem,e.modelCursor,n.schema)&&(e=Object.assign(e,Rf(e.viewItem,e.modelCursor,n)))},{priority:"low"}),n.upcastDispatcher.on("text",(t,e,n)=>{e.modelRange||Of(e.viewItem,e.modelCursor,n.schema)&&(e=Object.assign(e,Rf(e.viewItem,e.modelCursor,n)))},{priority:"lowest"}),e.document.registerPostFixer(t=>this._autoparagraphEmptyRoots(t)),t.on("dataReady",()=>{e.enqueueChange("transparent",t=>this._autoparagraphEmptyRoots(t))},{priority:"lowest"})}_autoparagraphEmptyRoots(t){const e=this.editor.model;for(const n of e.document.getRootNames()){const o=e.document.getRoot(n);if(o.isEmpty&&"$graveyard"!=o.rootName&&e.schema.checkChild(o,"paragraph"))return t.insertElement("paragraph",o),!0}}}function Rf(t,e,n){const o=n.writer.createElement("paragraph");return n.writer.insert(o,e),n.convertItem(t,n.writer.createPositionAt(o,0))}function Of(t,e,n){const o=n.createContext(e);return!!n.checkChild(o,"paragraph")&&!!n.checkChild(o.push("paragraph"),t)}Ef.paragraphLikeElements=new Set(["blockquote","dd","div","dt","h1","h2","h3","h4","h5","h6","li","p","td"]);class If extends Ql{constructor(t,e){super(t),this.modelElements=e}refresh(){const t=Lh(this.editor.model.document.selection.getSelectedBlocks());this.value=!!t&&this.modelElements.includes(t.name)&&t.name,this.isEnabled=!!t&&this.modelElements.some(e=>Vf(t,e,this.editor.model.schema))}execute(t){const e=this.editor.model,n=e.document,o=t.value;e.change(t=>{const i=Array.from(n.selection.getSelectedBlocks()).filter(t=>Vf(t,o,e.schema));for(const e of i)e.is(o)||t.rename(e,o)})}}function Vf(t,e,n){return n.checkChild(t.parent,e)&&!n.isObject(t)}const Mf="paragraph";class Nf extends Kc{constructor(t){super(t),t.config.define("heading",{options:[{model:"paragraph",title:"Paragraph",class:"ck-heading_paragraph"},{model:"heading1",view:"h2",title:"Heading 1",class:"ck-heading_heading1"},{model:"heading2",view:"h3",title:"Heading 2",class:"ck-heading_heading2"},{model:"heading3",view:"h4",title:"Heading 3",class:"ck-heading_heading3"}]})}static get requires(){return[Ef]}init(){const t=this.editor,e=t.config.get("heading.options"),n=[];for(const o of e)o.model!==Mf&&(t.model.schema.register(o.model,{inheritAllFrom:"$block"}),t.conversion.elementToElement(o),n.push(o.model));this._addDefaultH1Conversion(t),t.commands.add("heading",new If(t,n))}afterInit(){const t=this.editor,e=t.commands.get("enter"),n=t.config.get("heading.options");e&&this.listenTo(e,"afterExecute",(e,o)=>{const i=t.model.document.selection.getFirstPosition().parent;n.some(t=>i.is(t.model))&&!i.is(Mf)&&0===i.childCount&&o.writer.rename(i,Mf)})}_addDefaultH1Conversion(t){t.conversion.for("upcast").add(Va({model:"heading1",view:"h1",converterPriority:O.get("low")+1}))}}class Bf{constructor(t,e){e&&Io(this,e),t&&this.set(t)}}j(Bf,Fo);class Ff extends bl{constructor(t){super(t);const e=this.bindTemplate;this.set("isVisible",!1),this.set("position","se"),this.children=this.createCollection(),this.setTemplate({tag:"div",attributes:{class:["ck","ck-reset","ck-dropdown__panel",e.to("position",t=>`ck-dropdown__panel_${t}`),e.if("isVisible","ck-dropdown__panel-visible")]},children:this.children,on:{selectstart:e.to(t=>t.preventDefault())}})}focus(){this.children.length&&this.children.first.focus()}focusLast(){if(this.children.length){const t=this.children.last;"function"==typeof t.focusLast?t.focusLast():t.focus()}}}n(83);class Df extends bl{constructor(t,e,n){super(t);const o=this.bindTemplate;this.buttonView=e,this.panelView=n,this.set("isOpen",!1),this.set("isEnabled",!0),this.set("class"),this.set("panelPosition","auto"),this.focusTracker=new El,this.keystrokes=new qc,this.setTemplate({tag:"div",attributes:{class:["ck","ck-dropdown",o.to("class"),o.if("isEnabled","ck-disabled",t=>!t)]},children:[e,n]}),e.extendTemplate({attributes:{class:["ck-dropdown__button"]}})}render(){super.render(),this.listenTo(this.buttonView,"open",()=>{this.isOpen=!this.isOpen}),this.panelView.bind("isVisible").to(this,"isOpen"),this.on("change:isOpen",()=>{if(this.isOpen)if("auto"===this.panelPosition){const t=Df.defaultPanelPositions;this.panelView.position=wl({element:this.panelView.element,target:this.buttonView.element,fitInViewport:!0,positions:[t.southEast,t.southWest,t.northEast,t.northWest]}).name}else this.panelView.position=this.panelPosition}),this.keystrokes.listenTo(this.element),this.focusTracker.add(this.element);const t=(t,e)=>{this.isOpen&&(this.buttonView.focus(),this.isOpen=!1,e())};this.keystrokes.set("arrowdown",(t,e)=>{this.buttonView.isEnabled&&!this.isOpen&&(this.isOpen=!0,e())}),this.keystrokes.set("arrowright",(t,e)=>{this.isOpen&&e()}),this.keystrokes.set("arrowleft",t),this.keystrokes.set("esc",t)}focus(){this.buttonView.focus()}}Df.defaultPanelPositions={southEast:t=>({top:t.bottom,left:t.left,name:"se"}),southWest:(t,e)=>({top:t.bottom,left:t.left-e.width+t.width,name:"sw"}),northEast:(t,e)=>({top:t.top-e.height,left:t.left,name:"ne"}),northWest:(t,e)=>({top:t.bottom-e.height,left:t.left-e.width+t.width,name:"nw"})};var Lf=n(36),zf=n.n(Lf);class jf extends qd{constructor(t){super(t),this.arrowView=this._createArrowView(),this.extendTemplate({attributes:{"aria-haspopup":!0}}),this.delegate("execute").to(this,"open")}render(){super.render(),this.children.add(this.arrowView)}_createArrowView(){const t=new zd;return t.content=zf.a,t.extendTemplate({attributes:{class:"ck-dropdown__arrow"}}),t}}n(81);class qf extends bl{constructor(){super(),this.items=this.createCollection(),this.focusTracker=new El,this.keystrokes=new qc,this._focusCycler=new Rl({focusables:this.items,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"arrowup",focusNext:"arrowdown"}}),this.setTemplate({tag:"ul",attributes:{class:["ck","ck-reset","ck-list"]},children:this.items})}render(){super.render();for(const t of this.items)this.focusTracker.add(t.element);this.items.on("add",(t,e)=>{this.focusTracker.add(e.element)}),this.items.on("remove",(t,e)=>{this.focusTracker.remove(e.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}focusLast(){this._focusCycler.focusLast()}}class Hf extends bl{constructor(t){super(t),this.children=this.createCollection(),this.setTemplate({tag:"li",attributes:{class:["ck","ck-list__item"]},children:this.children})}focus(){this.children.first.focus()}}class Uf extends bl{constructor(t){super(t),this.setTemplate({tag:"li",attributes:{class:["ck","ck-list__separator"]}})}}n(79);class Wf extends qd{constructor(t){super(t),this.toggleSwitchView=this._createToggleView(),this.extendTemplate({attributes:{class:"ck-switchbutton"}})}render(){super.render(),this.children.add(this.toggleSwitchView)}_createToggleView(){const t=new bl;return t.setTemplate({tag:"span",attributes:{class:["ck","ck-button__toggle"]},children:[{tag:"span",attributes:{class:["ck","ck-button__toggle__inner"]}}]}),t}}n(77),n(75);function $f(t,e=jf){const n=new e(t),o=new Ff(t),i=new Df(t,n,o);return n.bind("isEnabled").to(i),n instanceof jf?n.bind("isOn").to(i,"isOpen"):n.arrowView.bind("isOn").to(i,"isOpen"),function(t){(function(t){t.on("render",()=>{qu({emitter:t,activator:()=>t.isOpen,callback:()=>{t.isOpen=!1},contextElements:[t.element]})})})(t),function(t){t.on("execute",e=>{e.source instanceof Wf||(t.isOpen=!1)})}(t),function(t){t.keystrokes.set("arrowdown",(e,n)=>{t.isOpen&&(t.panelView.focus(),n())}),t.keystrokes.set("arrowup",(e,n)=>{t.isOpen&&(t.panelView.focusLast(),n())})}(t)}(i),i}function Kf(t,e){const n=t.locale,o=t.listView=new qf(n);o.items.bindTo(e).using(({type:t,model:e})=>{if("separator"===t)return new Uf(n);if("button"===t||"switchbutton"===t){const o=new Hf(n);let i;return(i="button"===t?new qd(n):new Wf(n)).bind(...Object.keys(e)).to(e),i.delegate("execute").to(o),o.children.add(i),o}}),t.panelView.children.add(o),o.items.delegate("execute").to(t)}function Gf(t){const e=t.t,n={Paragraph:e("b"),"Heading 1":e("n"),"Heading 2":e("o"),"Heading 3":e("p")};return t.config.get("heading.options").map(t=>{const e=n[t.title];return e&&e!=t.title&&(t=Object.assign({},t,{title:e})),t})}n(16);class Jf extends Kc{init(){const t=this.editor,e=t.t,n=Gf(t),o=e("k"),i=e("l");t.ui.componentFactory.add("heading",e=>{const r={},s=new ti,a=t.commands.get("heading"),c=t.commands.get("paragraph"),l=[a];for(const t of n){const e={type:"button",model:new Bf({label:t.title,class:t.class,withText:!0})};"paragraph"===t.model?(e.model.bind("isOn").to(c,"value"),e.model.set("commandName","paragraph"),l.push(c)):(e.model.bind("isOn").to(a,"value",e=>e===t.model),e.model.set({commandName:"heading",commandValue:t.model})),s.add(e),r[t.model]=t.title}const d=$f(e);return Kf(d,s),d.buttonView.set({isOn:!1,withText:!0,tooltip:i}),d.extendTemplate({attributes:{class:["ck-heading-dropdown"]}}),d.bind("isEnabled").toMany(l,"isEnabled",(...t)=>t.some(t=>t)),d.buttonView.bind("label").to(a,"value",c,"value",(t,e)=>{const n=t||e&&"paragraph";return r[n]?r[n]:o}),this.listenTo(d,"execute",e=>{t.execute(e.source.commandName,e.source.commandValue?{value:e.source.commandValue}:void 0),t.editing.view.focus()}),d})}}n(72);const Qf=new WeakMap;function Xf(t,e,n,o){const i=t.document;Qf.has(i)||(Qf.set(i,new Map),i.registerPostFixer(t=>(function(t,e){const n=Qf.get(t);let o=!1;for(const[t,i]of n)Yf(e,t,i)&&(o=!0);return o})(i,t))),Qf.get(i).set(e,{placeholderText:n,checkFunction:o}),t.render()}function Yf(t,e,n){const o=e.document,i=n.placeholderText;let r=!1;if(!o)return!1;e.getAttribute("data-placeholder")!==i&&(t.setAttribute("data-placeholder",i,e),r=!0);const s=o.selection.anchor,a=n.checkFunction;if(a&&!a())return e.hasClass("ck-placeholder")&&(t.removeClass("ck-placeholder",e),r=!0),r;const c=!Array.from(e.getChildren()).some(t=>!t.is("uiElement"));return!o.isFocused&&c?(e.hasClass("ck-placeholder")||(t.addClass("ck-placeholder",e),r=!0),r):(c&&s&&s.parent!==e?e.hasClass("ck-placeholder")||(t.addClass("ck-placeholder",e),r=!0):e.hasClass("ck-placeholder")&&(t.removeClass("ck-placeholder",e),r=!0),r)}const Zf=Symbol("imageCaption");function tp(t){for(const e of t.getChildren())if(e&&e.is("caption"))return e;return null}function ep(t){const e=t.parent;return"figcaption"==t.name&&e&&"figure"==e.name&&e.hasClass("image")?{name:!0}:null}class np extends Kc{init(){const t=this.editor,e=t.editing.view,n=t.model.schema,o=t.data,i=t.editing,r=t.t;n.register("caption",{allowIn:"image",allowContentOf:"$block",isLimit:!0}),t.model.document.registerPostFixer(t=>this._insertMissingModelCaptionElement(t)),t.conversion.for("upcast").add(Va({view:ep,model:"caption"}));o.downcastDispatcher.on("insert:caption",op(t=>t.createContainerElement("figcaption"),!1));const s=function(t,e){return n=>{const o=n.createEditableElement("figcaption");return n.setCustomProperty(Zf,!0,o),Xf(t,o,e),Cu(o,n)}}(e,r("x"));i.downcastDispatcher.on("insert:caption",op(s)),i.downcastDispatcher.on("insert",this._fixCaptionVisibility(t=>t.item),{priority:"high"}),i.downcastDispatcher.on("remove",this._fixCaptionVisibility(t=>t.position.parent),{priority:"high"}),e.document.registerPostFixer(t=>this._updateCaptionVisibility(t))}_updateCaptionVisibility(t){const e=this.editor.editing.mapper,n=this._lastSelectedCaption;let o;const i=this.editor.model.document.selection,r=i.getSelectedElement();if(r&&r.is("image")){const t=tp(r);o=e.toViewElement(t)}const s=ip(i.getFirstPosition().parent);if(s&&(o=e.toViewElement(s)),o)return n?n===o?sp(o,t):(rp(n,t),this._lastSelectedCaption=o,sp(o,t)):(this._lastSelectedCaption=o,sp(o,t));if(n){const e=rp(n,t);return this._lastSelectedCaption=null,e}return!1}_fixCaptionVisibility(t){return(e,n,o)=>{const i=ip(t(n)),r=this.editor.editing.mapper,s=o.writer;if(i){const t=r.toViewElement(i);t&&(i.childCount?s.removeClass("ck-hidden",t):s.addClass("ck-hidden",t))}}}_insertMissingModelCaptionElement(t){const e=this.editor.model.document.differ.getChanges();for(const n of e)if("insert"==n.type&&"image"==n.name){const e=n.position.nodeAfter;if(!tp(e))return t.appendElement("caption",e),!0}}}function op(t,e=!0){return(n,o,i)=>{const r=o.item;if((r.childCount||e)&&Ru(r.parent)){if(!i.consumable.consume(o.item,"insert"))return;const e=i.mapper.toViewElement(o.range.start.parent),n=t(i.writer),s=i.writer;r.childCount||s.addClass("ck-hidden",n),function(t,e,n,o){const i=o.writer.createPositionAt(n,"end");o.writer.insert(i,t),o.mapper.bindElements(e,t)}(n,o.item,e,i)}}}function ip(t){const e=t.getAncestors({includeSelf:!0}).find(t=>"caption"==t.name);return e&&e.parent&&"image"==e.parent.name?e:null}function rp(t,e){return!t.childCount&&!t.hasClass("ck-hidden")&&(e.addClass("ck-hidden",t),!0)}function sp(t,e){return!!t.hasClass("ck-hidden")&&(e.removeClass("ck-hidden",t),!0)}n(70);class ap extends Ql{constructor(t,e){super(t),this._defaultStyle=!1,this.styles=e.reduce((t,e)=>(t[e.name]=e,e.isDefault&&(this._defaultStyle=e.name),t),{})}refresh(){const t=this.editor.model.document.selection.getSelectedElement();if(this.isEnabled=Ru(t),t)if(t.hasAttribute("imageStyle")){const e=t.getAttribute("imageStyle");this.value=!!this.styles[e]&&e}else this.value=this._defaultStyle;else this.value=!1}execute(t){const e=t.value,n=this.editor.model,o=n.document.selection.getSelectedElement();n.change(t=>{this.styles[e].isDefault?t.removeAttribute("imageStyle",o):t.setAttribute("imageStyle",e,o)})}}function cp(t,e){for(const n of e)if(n.name===t)return n}var lp=n(14),dp=n.n(lp),hp=n(13),up=n.n(hp),fp=n(12),pp=n.n(fp),gp=n(10),mp=n.n(gp);const bp={full:{name:"full",title:"Full size image",icon:dp.a,isDefault:!0},side:{name:"side",title:"Side image",icon:mp.a,className:"image-style-side"},alignLeft:{name:"alignLeft",title:"Left aligned image",icon:up.a,className:"image-style-align-left"},alignCenter:{name:"alignCenter",title:"Centered image",icon:pp.a,className:"image-style-align-center"},alignRight:{name:"alignRight",title:"Right aligned image",icon:mp.a,className:"image-style-align-right"}},wp={full:dp.a,left:up.a,right:mp.a,center:pp.a};function _p(t=[]){return t.map(vp).map(t=>Object.assign({},t))}function vp(t){if("string"==typeof t){const e=t;bp[e]?t=Object.assign({},bp[e]):(fs.a.warn("image-style-not-found: There is no such image style of given name.",{name:e}),t={name:e})}else if(bp[t.name]){const e=bp[t.name],n=Object.assign({},t);for(const o in e)t.hasOwnProperty(o)||(n[o]=e[o]);t=n}return"string"==typeof t.icon&&wp[t.icon]&&(t.icon=wp[t.icon]),t}class kp extends Kc{static get requires(){return[Mu]}static get pluginName(){return"ImageStyleEditing"}init(){const t=this.editor,e=t.model.schema,n=t.data,o=t.editing;t.config.define("image.styles",["full","side"]);const i=_p(t.config.get("image.styles"));e.extend("image",{allowAttributes:"imageStyle"});const r=function(t){return(e,n,o)=>{if(!o.consumable.consume(n.item,e.name))return;const i=cp(n.attributeNewValue,t),r=cp(n.attributeOldValue,t),s=o.mapper.toViewElement(n.item),a=o.writer;r&&a.removeClass(r.className,s),i&&a.addClass(i.className,s)}}(i);o.downcastDispatcher.on("attribute:imageStyle:image",r),n.downcastDispatcher.on("attribute:imageStyle:image",r),n.upcastDispatcher.on("element:figure",function(t){const e=t.filter(t=>!t.isDefault);return(t,n,o)=>{if(!n.modelRange)return;const i=n.viewItem,r=Lh(n.modelRange.getItems());if(o.schema.checkAttribute(r,"imageStyle"))for(const t of e)o.consumable.consume(i,{classes:t.className})&&o.writer.setAttribute("imageStyle",t.name,r)}}(i),{priority:"low"}),t.commands.add("imageStyle",new ap(t,i))}}n(68);class yp extends Kc{get localizedDefaultStylesTitles(){const t=this.editor.t;return{"Full size image":t("q"),"Side image":t("r"),"Left aligned image":t("s"),"Centered image":t("t"),"Right aligned image":t("u")}}init(){const t=function(t,e){for(const n of t)e[n.title]&&(n.title=e[n.title]);return t}(_p(this.editor.config.get("image.styles")),this.localizedDefaultStylesTitles);for(const e of t)this._createButton(e)}_createButton(t){const e=this.editor,n=`imageStyle:${t.name}`;e.ui.componentFactory.add(n,n=>{const o=e.commands.get("imageStyle"),i=new qd(n);return i.set({label:t.title,icon:t.icon,tooltip:!0}),i.bind("isEnabled").to(o,"isEnabled"),i.bind("isOn").to(o,"value",e=>e===t.name),this.listenTo(i,"execute",()=>e.execute("imageStyle",{value:t.name})),i})}}class xp extends Kc{static get requires(){return[Sl]}static get pluginName(){return"WidgetToolbarRepository"}init(){const t=this.editor,e=t.plugins.get("BalloonToolbar");e&&this.listenTo(e,"show",e=>{(function(t){const e=t.getSelectedElement();return!(!e||!yu(e))})(t.editing.view.document.selection)&&e.stop()},{priority:"high"}),this._toolbars=new Map,this._balloon=this.editor.plugins.get("ContextualBalloon"),this.listenTo(t.ui,"update",()=>{this._updateToolbarsVisibility()}),this.listenTo(t.ui.focusTracker,"change:isFocused",()=>{this._updateToolbarsVisibility()},{priority:"low"})}register(t,{items:e,visibleWhen:n,balloonClassName:o="ck-toolbar-container"}){const i=this.editor,r=new Vl;if(this._toolbars.has(t))throw new T.b("widget-toolbar-duplicated: Toolbar with the given id was already added.",{toolbarId:t});r.fillFromConfig(e,i.ui.componentFactory),this._toolbars.set(t,{view:r,visibleWhen:n,balloonClassName:o})}_updateToolbarsVisibility(){for(const t of this._toolbars.values())this.editor.ui.focusTracker.isFocused&&t.visibleWhen(this.editor.editing.view.document.selection)?this._showToolbar(t):this._hideToolbar(t)}_hideToolbar(t){this._isToolbarVisible(t)&&this._balloon.remove(t.view)}_showToolbar(t){this._isToolbarVisible(t)?function(t){const e=t.plugins.get("ContextualBalloon"),n=Ap(t);e.updatePosition(n)}(this.editor):this._balloon.hasView(t.view)||this._balloon.add({view:t.view,position:Ap(this.editor),balloonClassName:t.balloonClassName})}_isToolbarVisible(t){return this._balloon.visibleView==t.view}}function Ap(t){const e=t.editing.view,n=Al.defaultPositions,o=function(t){const e=t.getSelectedElement();if(e&&yu(e))return e;let n=t.getFirstPosition().parent;for(;n;){if(n.is("element")&&yu(n))return n;n=n.parent}}(e.document.selection);return{target:e.domConverter.viewToDom(o),positions:[n.northArrowSouth,n.northArrowSouthWest,n.northArrowSouthEast,n.southArrowNorth,n.southArrowNorthWest,n.southArrowNorthEast]}}function Cp(t,e,n){return n.createRange(Pp(t,e,!0,n),Pp(t,e,!1,n))}function Pp(t,e,n,o){let i=t.textNode||(n?t.nodeBefore:t.nodeAfter),r=null;for(;i&&i.getAttribute("linkHref")==e;)r=i,i=n?i.previousSibling:i.nextSibling;return r?o.createPositionAt(r,n?"before":"after"):t}class Tp extends Ql{refresh(){const t=this.editor.model,e=t.document;this.value=e.selection.getAttribute("linkHref"),this.isEnabled=t.schema.checkAttributeInSelection(e.selection,"linkHref")}execute(t){const e=this.editor.model,n=e.document.selection;e.change(o=>{if(n.isCollapsed){const i=n.getFirstPosition();if(n.hasAttribute("linkHref")){const i=Cp(n.getFirstPosition(),n.getAttribute("linkHref"),e);o.setAttribute("linkHref",t,i),o.setSelection(i)}else if(""!==t){const e=Ms(n.getAttributes());e.set("linkHref",t);const r=o.createText(t,e);o.insert(r,i),o.setSelection(o.createRangeOn(r))}}else{const i=e.schema.getValidRanges(n.getRanges(),"linkHref");for(const e of i)o.setAttribute("linkHref",t,e)}})}}class Sp extends Ql{refresh(){this.isEnabled=this.editor.model.document.selection.hasAttribute("linkHref")}execute(){const t=this.editor.model,e=t.document.selection;t.change(n=>{const o=e.isCollapsed?[Cp(e.getFirstPosition(),e.getAttribute("linkHref"),t)]:e.getRanges();for(const t of o)n.removeAttribute("linkHref",t)})}}const Ep=Symbol("linkElement"),Rp=/[\u0000-\u0020\u00A0\u1680\u180E\u2000-\u2029\u205f\u3000]/g,Op=/^(?:(?:https?|ftps?|mailto):|[^a-z]|[a-z+.-]+(?:[^a-z+.:-]|$))/i;function Ip(t,e){const n=e.createAttributeElement("a",{href:t},{priority:5});return e.setCustomProperty(Ep,!0,n),n}function Vp(t){return function(t){return t.replace(Rp,"").match(Op)}(t=String(t))?t:"#"}class Mp{constructor(t,e,n){this.model=t,this.attribute=n,this._modelSelection=t.document.selection,this._overrideUid=null,this._isNextGravityRestorationSkipped=!1,e.listenTo(this._modelSelection,"change:range",(t,e)=>{this._isNextGravityRestorationSkipped?this._isNextGravityRestorationSkipped=!1:this._isGravityOverridden&&(!e.directChange&&Np(this._modelSelection.getFirstPosition(),n)||this._restoreGravity())})}handleForwardMovement(t,e){const n=this.attribute;if(!(this._isGravityOverridden||t.isAtStart&&this._hasSelectionAttribute))return Dp(t,n)&&this._hasSelectionAttribute?(this._preventCaretMovement(e),this._removeSelectionAttribute(),!0):Bp(t,n)?(this._preventCaretMovement(e),this._overrideGravity(),!0):Fp(t,n)&&this._hasSelectionAttribute?(this._preventCaretMovement(e),this._overrideGravity(),!0):void 0}handleBackwardMovement(t,e){const n=this.attribute;return this._isGravityOverridden?Dp(t,n)&&this._hasSelectionAttribute?(this._preventCaretMovement(e),this._restoreGravity(),this._removeSelectionAttribute(),!0):(this._preventCaretMovement(e),this._restoreGravity(),t.isAtStart&&this._removeSelectionAttribute(),!0):Dp(t,n)&&!this._hasSelectionAttribute?(this._preventCaretMovement(e),this._setSelectionAttributeFromTheNodeBefore(t),!0):t.isAtEnd&&Fp(t,n)?this._hasSelectionAttribute?void(Lp(t,n)&&(this._skipNextAutomaticGravityRestoration(),this._overrideGravity())):(this._preventCaretMovement(e),this._setSelectionAttributeFromTheNodeBefore(t),!0):t.isAtStart?this._hasSelectionAttribute?(this._removeSelectionAttribute(),this._preventCaretMovement(e),!0):void 0:void(Lp(t,n)&&(this._skipNextAutomaticGravityRestoration(),this._overrideGravity()))}get _isGravityOverridden(){return!!this._overrideUid}get _hasSelectionAttribute(){return this._modelSelection.hasAttribute(this.attribute)}_overrideGravity(){this._overrideUid=this.model.change(t=>t.overrideSelectionGravity())}_restoreGravity(){this.model.change(t=>{t.restoreSelectionGravity(this._overrideUid),this._overrideUid=null})}_preventCaretMovement(t){t.preventDefault()}_removeSelectionAttribute(){this.model.change(t=>{t.removeSelectionAttribute(this.attribute)})}_setSelectionAttributeFromTheNodeBefore(t){const e=this.attribute;this.model.change(n=>{n.setSelectionAttribute(this.attribute,t.nodeBefore.getAttribute(e))})}_skipNextAutomaticGravityRestoration(){this._isNextGravityRestorationSkipped=!0}}function Np(t,e){return Bp(t,e)||Fp(t,e)}function Bp(t,e){const{nodeBefore:n,nodeAfter:o}=t,i=!!n&&n.hasAttribute(e);return!!o&&o.hasAttribute(e)&&(!i||n.getAttribute(e)!==o.getAttribute(e))}function Fp(t,e){const{nodeBefore:n,nodeAfter:o}=t,i=!!n&&n.hasAttribute(e),r=!!o&&o.hasAttribute(e);return i&&(!r||n.getAttribute(e)!==o.getAttribute(e))}function Dp(t,e){const{nodeBefore:n,nodeAfter:o}=t,i=!!n&&n.hasAttribute(e);if(!!o&&o.hasAttribute(e)&&i)return o.getAttribute(e)!==n.getAttribute(e)}function Lp(t,e){return Np(t.getShiftedBy(-1),e)}n(66);const zp="ck-link_selected";class jp extends Kc{init(){const t=this.editor;t.model.schema.extend("$text",{allowAttributes:"linkHref"}),t.conversion.for("dataDowncast").add(ca({model:"linkHref",view:Ip})),t.conversion.for("editingDowncast").add(ca({model:"linkHref",view:(t,e)=>Ip(Vp(t),e)})),t.conversion.for("upcast").add(Ma({view:{name:"a",attributes:{href:!0}},model:{key:"linkHref",value:t=>t.getAttribute("href")}})),t.commands.add("link",new Tp(t)),t.commands.add("unlink",new Sp(t)),function(t,e,n,o){const i=new Mp(e,n,o),r=e.document.selection;n.listenTo(t.document,"keydown",(t,e)=>{if(!r.isCollapsed)return;if(e.shiftKey||e.altKey||e.ctrlKey)return;const n=e.keyCode==ui.arrowright,o=e.keyCode==ui.arrowleft;if(!n&&!o)return;const s=r.getFirstPosition();let a;(a=n?i.handleForwardMovement(s,e):i.handleBackwardMovement(s,e))&&t.stop()},{priority:O.get("high")+1})}(t.editing.view,t.model,this,"linkHref"),this._setupLinkHighlight()}_setupLinkHighlight(){const t=this.editor,e=t.editing.view,n=new Set;e.document.registerPostFixer(e=>{const o=t.model.document.selection;if(o.hasAttribute("linkHref")){const i=Cp(o.getFirstPosition(),o.getAttribute("linkHref"),t.model),r=t.editing.mapper.toViewRange(i);for(const t of r.getItems())t.is("a")&&(e.addClass(zp,t),n.add(t))}}),t.conversion.for("editingDowncast").add(t=>{function o(){e.change(t=>{for(const e of n.values())t.removeClass(zp,e),n.delete(e)})}t.on("insert",o,{priority:"highest"}),t.on("remove",o,{priority:"highest"}),t.on("attribute",o,{priority:"highest"}),t.on("selection",o,{priority:"highest"})})}}class qp extends Qr{constructor(t){super(t),this.domEventType="click"}onDomEvent(t){this.fire(t.type,t)}}n(64);class Hp extends bl{constructor(t){super(t);const e=t.t;this.focusTracker=new El,this.keystrokes=new qc,this.urlInputView=this._createUrlInput(),this.saveButtonView=this._createButton(e("bc"),Gu.a,"ck-button-save"),this.saveButtonView.type="submit",this.cancelButtonView=this._createButton(e("bd"),Qu.a,"ck-button-cancel","cancel"),this._focusables=new Gc,this._focusCycler=new Rl({focusables:this._focusables,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"shift + tab",focusNext:"tab"}}),this.setTemplate({tag:"form",attributes:{class:["ck","ck-link-form"],tabindex:"-1"},children:[this.urlInputView,this.saveButtonView,this.cancelButtonView]})}render(){super.render(),$u({view:this}),[this.urlInputView,this.saveButtonView,this.cancelButtonView].forEach(t=>{this._focusables.add(t),this.focusTracker.add(t.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}_createUrlInput(){const t=this.locale.t,e=new Uu(this.locale,Wu);return e.label=t("bj"),e.inputView.placeholder="https://example.com",e}_createButton(t,e,n,o){const i=new qd(this.locale);return i.set({label:t,icon:e,tooltip:!0}),i.extendTemplate({attributes:{class:n}}),o&&i.delegate("execute").to(this,o),i}}var Up=n(35),Wp=n.n(Up),$p=n(34),Kp=n.n($p);n(62);class Gp extends bl{constructor(t){super(t);const e=t.t;this.focusTracker=new El,this.keystrokes=new qc,this.previewButtonView=this._createPreviewButton(),this.unlinkButtonView=this._createButton(e("bf"),Wp.a,"unlink"),this.editButtonView=this._createButton(e("bg"),Kp.a,"edit"),this.set("href"),this._focusables=new Gc,this._focusCycler=new Rl({focusables:this._focusables,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"shift + tab",focusNext:"tab"}}),this.setTemplate({tag:"div",attributes:{class:["ck","ck-link-actions"],tabindex:"-1"},children:[this.previewButtonView,this.editButtonView,this.unlinkButtonView]})}render(){super.render(),[this.previewButtonView,this.editButtonView,this.unlinkButtonView].forEach(t=>{this._focusables.add(t),this.focusTracker.add(t.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}_createButton(t,e,n){const o=new qd(this.locale);return o.set({label:t,icon:e,tooltip:!0}),o.delegate("execute").to(this,n),o}_createPreviewButton(){const t=new qd(this.locale),e=this.bindTemplate,n=this.t;return t.set({withText:!0,tooltip:n("bh")}),t.extendTemplate({attributes:{class:["ck","ck-link-actions__preview"],href:e.to("href",t=>t&&Vp(t)),target:"_blank"}}),t.bind("label").to(this,"href",t=>t||n("bi")),t.bind("isEnabled").to(this,"href",t=>!!t),t.template.tag="a",t.template.eventListeners={},t}}var Jp=n(33),Qp=n.n(Jp);const Xp="Ctrl+K";class Yp extends Kc{static get requires(){return[Sl]}init(){const t=this.editor;t.editing.view.addObserver(qp),this.actionsView=this._createActionsView(),this.formView=this._createFormView(),this._balloon=t.plugins.get(Sl),this._createToolbarLinkButton(),this._enableUserBalloonInteractions()}_createActionsView(){const t=this.editor,e=new Gp(t.locale),n=t.commands.get("link"),o=t.commands.get("unlink");return e.bind("href").to(n,"value"),e.editButtonView.bind("isEnabled").to(n),e.unlinkButtonView.bind("isEnabled").to(o),this.listenTo(e,"edit",()=>{this._addFormView()}),this.listenTo(e,"unlink",()=>{t.execute("unlink"),this._hideUI()}),e.keystrokes.set("Esc",(t,e)=>{this._hideUI(),e()}),e.keystrokes.set(Xp,(t,e)=>{this._addFormView(),e()}),e}_createFormView(){const t=this.editor,e=new Hp(t.locale),n=t.commands.get("link");return e.urlInputView.bind("value").to(n,"value"),e.urlInputView.bind("isReadOnly").to(n,"isEnabled",t=>!t),e.saveButtonView.bind("isEnabled").to(n),this.listenTo(e,"submit",()=>{t.execute("link",e.urlInputView.inputView.element.value),this._removeFormView()}),this.listenTo(e,"cancel",()=>{this._removeFormView()}),e.keystrokes.set("Esc",(t,e)=>{this._removeFormView(),e()}),e}_createToolbarLinkButton(){const t=this.editor,e=t.commands.get("link"),n=t.t;t.keystrokes.set(Xp,(t,n)=>{n(),e.isEnabled&&this._showUI()}),t.ui.componentFactory.add("link",t=>{const o=new qd(t);return o.isEnabled=!0,o.label=n("as"),o.icon=Qp.a,o.keystroke=Xp,o.tooltip=!0,o.bind("isOn","isEnabled").to(e,"value","isEnabled"),this.listenTo(o,"execute",()=>this._showUI()),o})}_enableUserBalloonInteractions(){const t=this.editor.editing.view.document;this.listenTo(t,"click",()=>{this._getSelectedLinkElement()&&this._showUI()}),this.editor.keystrokes.set("Tab",(t,e)=>{this._areActionsVisible&&!this.actionsView.focusTracker.isFocused&&(this.actionsView.focus(),e())},{priority:"high"}),this.editor.keystrokes.set("Esc",(t,e)=>{this._isUIVisible&&(this._hideUI(),e())}),qu({emitter:this.formView,activator:()=>this._isUIVisible,contextElements:[this._balloon.view.element],callback:()=>this._hideUI()})}_addActionsView(){this._areActionsInPanel||this._balloon.add({view:this.actionsView,position:this._getBalloonPositionData()})}_addFormView(){if(this._isFormInPanel)return;const t=this.editor.commands.get("link");this._balloon.add({view:this.formView,position:this._getBalloonPositionData()}),this.formView.urlInputView.select(),this.formView.urlInputView.inputView.element.value=t.value||""}_removeFormView(){this._isFormInPanel&&(this._balloon.remove(this.formView),this.editor.editing.view.focus())}_showUI(){this.editor.commands.get("link").isEnabled&&(this._getSelectedLinkElement()?this._areActionsVisible?this._addFormView():this._addActionsView():(this._addActionsView(),this._addFormView()),this._startUpdatingUI())}_hideUI(){if(!this._isUIInPanel)return;const t=this.editor;this.stopListening(t.ui,"update"),this._removeFormView(),this._balloon.remove(this.actionsView),t.editing.view.focus()}_startUpdatingUI(){const t=this.editor,e=t.editing.view.document;let n=this._getSelectedLinkElement(),o=i();function i(){return e.selection.focus.getAncestors().reverse().find(t=>t.is("element"))}this.listenTo(t.ui,"update",()=>{const t=this._getSelectedLinkElement(),e=i();n&&!t||!n&&e!==o?this._hideUI():this._balloon.updatePosition(this._getBalloonPositionData()),n=t,o=e})}get _isFormInPanel(){return this._balloon.hasView(this.formView)}get _areActionsInPanel(){return this._balloon.hasView(this.actionsView)}get _areActionsVisible(){return this._balloon.visibleView===this.actionsView}get _isUIInPanel(){return this._isFormInPanel||this._areActionsInPanel}get _isUIVisible(){return this._balloon.visibleView==this.formView||this._areActionsVisible}_getBalloonPositionData(){const t=this.editor.editing.view,e=t.document,n=this._getSelectedLinkElement();return{target:n?t.domConverter.mapViewToDom(n):t.domConverter.viewRangeToDom(e.selection.getFirstRange())}}_getSelectedLinkElement(){const t=this.editor.editing.view,e=t.document.selection;if(e.isCollapsed)return Zp(e.getFirstPosition());{const n=e.getFirstRange().getTrimmed(),o=Zp(n.start),i=Zp(n.end);return o&&o==i&&t.createRangeIn(o).getTrimmed().isEqual(n)?o:null}}}function Zp(t){return t.getAncestors().find(t=>(function(t){return t.is("attributeElement")&&!!t.getCustomProperty(Ep)})(t))}class tg extends Ql{constructor(t,e){super(t),this.type="bulleted"==e?"bulleted":"numbered"}refresh(){this.value=this._getValue(),this.isEnabled=this._checkEnabled()}execute(){const t=this.editor.model,e=t.document,n=Array.from(e.selection.getSelectedBlocks()).filter(e=>ng(e,t.schema)),o=!0===this.value;t.change(t=>{if(o){let e=n[n.length-1].nextSibling,o=Number.POSITIVE_INFINITY,i=[];for(;e&&"listItem"==e.name&&0!==e.getAttribute("listIndent");){const t=e.getAttribute("listIndent");t=n;)r>i.getAttribute("listIndent")&&(r=i.getAttribute("listIndent")),i.getAttribute("listIndent")==r&&t[e?"unshift":"push"](i),i=i[e?"previousSibling":"nextSibling"]}}function ng(t,e){return e.checkChild(t.parent,"listItem")&&!e.isObject(t)}class og extends Ql{constructor(t,e){super(t),this._indentBy="forward"==e?1:-1}refresh(){this.isEnabled=this._checkEnabled()}execute(){const t=this.editor.model,e=t.document;let n=Array.from(e.selection.getSelectedBlocks());t.change(t=>{const e=n[n.length-1];let o=e.nextSibling;for(;o&&"listItem"==o.name&&o.getAttribute("listIndent")>e.getAttribute("listIndent");)n.push(o),o=o.nextSibling;this._indentBy<0&&(n=n.reverse());for(const e of n){const n=e.getAttribute("listIndent")+this._indentBy;n<0?t.rename(e,"paragraph"):t.setAttribute("listIndent",n,e)}})}_checkEnabled(){const t=Lh(this.editor.model.document.selection.getSelectedBlocks());if(!t||!t.is("listItem"))return!1;if(this._indentBy>0){const e=t.getAttribute("listIndent"),n=t.getAttribute("listType");let o=t.previousSibling;for(;o&&o.is("listItem")&&o.getAttribute("listIndent")>=e;){if(o.getAttribute("listIndent")==e)return o.getAttribute("listType")==n;o=o.previousSibling}return!1}return!0}}function ig(){const t=!this.isEmpty&&("ul"==this.getChild(0).name||"ol"==this.getChild(0).name);return this.isEmpty||t?0:_o.call(this)}function rg(t){return(e,n,o)=>{const i=o.consumable;if(!i.test(n.item,"insert")||!i.test(n.item,"attribute:listType")||!i.test(n.item,"attribute:listIndent"))return;i.consume(n.item,"insert"),i.consume(n.item,"attribute:listType"),i.consume(n.item,"attribute:listIndent");const r=n.item;wg(r,function(t,e){const n=e.mapper,o=e.writer,i="numbered"==t.getAttribute("listType")?"ol":"ul",r=function(t){const e=t.createContainerElement("li");return e.getFillerOffset=ig,e}(o),s=o.createContainerElement(i,null);return o.insert(o.createPositionAt(s,0),r),n.bindElements(t,r),r}(r,o),o,t)}}function sg(t){return(e,n,o)=>{const i=o.mapper.toViewPosition(n.position).getLastMatchingPosition(t=>!t.item.is("li")).nodeAfter,r=o.writer;r.breakContainer(r.createPositionBefore(i)),r.breakContainer(r.createPositionAfter(i));const s=i.parent,a=s.previousSibling,c=r.createRangeOn(s),l=r.remove(c);a&&a.nextSibling&&bg(r,a,a.nextSibling),_g(o.mapper.toModelElement(i).getAttribute("listIndent")+1,n.position,c.start,i,o,t);for(const t of r.createRangeIn(l).getItems())o.mapper.unbindViewElement(t);e.stop()}}function ag(t,e,n){if(!n.consumable.consume(e.item,"attribute:listType"))return;const o=n.mapper.toViewElement(e.item),i=n.writer;i.breakContainer(i.createPositionBefore(o)),i.breakContainer(i.createPositionAfter(o));let r=o.parent;const s="numbered"==e.attributeNewValue?"ol":"ul";bg(i,r=i.rename(s,r),r.nextSibling),bg(i,r.previousSibling,r);for(const t of e.item.getChildren())n.consumable.consume(t,"insert")}function cg(t){return(e,n,o)=>{if(!o.consumable.consume(n.item,"attribute:listIndent"))return;const i=o.mapper.toViewElement(n.item),r=o.writer;r.breakContainer(r.createPositionBefore(i)),r.breakContainer(r.createPositionAfter(i));const s=i.parent,a=s.previousSibling,c=r.createRangeOn(s);r.remove(c),a&&a.nextSibling&&bg(r,a,a.nextSibling),_g(n.attributeOldValue+1,n.range.start,c.start,i,o,t),wg(n.item,i,o,t);for(const t of n.item.getChildren())o.consumable.consume(t,"insert")}}function lg(t,e,n){if("listItem"!=e.item.name){let t=n.mapper.toViewPosition(e.range.start);const o=n.writer,i=[];for(;("ul"==t.parent.name||"ol"==t.parent.name)&&"li"==(t=o.breakContainer(t)).parent.name;){const e=t,n=o.createPositionAt(t.parent,"end");if(!e.isEqual(n)){const t=o.remove(o.createRange(e,n));i.push(t)}t=o.createPositionAfter(t.parent)}if(i.length>0){for(let e=0;e0){const e=bg(o,n,n.nextSibling);e&&e.parent==n&&t.offset--}}bg(o,t.nodeBefore,t.nodeAfter)}}}function dg(t,e,n){const o=n.mapper.toViewPosition(e.position),i=o.nodeBefore,r=o.nodeAfter;bg(n.writer,i,r)}function hg(t,e,n){if(n.consumable.consume(e.viewItem,{name:!0})){const t=n.writer,o=this.conversionApi.store,i=t.createElement("listItem");o.indent=o.indent||0,t.setAttribute("listIndent",o.indent,i);const r=e.viewItem.parent&&"ol"==e.viewItem.parent.name?"numbered":"bulleted";t.setAttribute("listType",r,i),o.indent++;const s=n.splitToAllowedParent(i,e.modelCursor);if(!s)return;t.insert(i,s.position);const a=function(t,e,n){const o=n.writer;let i=t,r=o.createPositionAfter(t);for(const t of e)if("ul"==t.name||"ol"==t.name)r=n.convertItem(t,r).modelCursor;else{const e=n.convertItem(t,o.createPositionAt(i,"end")),s=e.modelRange.start.nodeAfter;r=e.modelCursor,s&&s.is("element")&&!n.schema.checkChild(i,s.name)&&!(i=r.parent).is("listItem")&&i.nextSibling&&i.nextSibling.is("listItem")&&(i=i.nextSibling,r=o.createPositionAt(i,"end"))}return r}(i,e.viewItem.getChildren(),n);o.indent--,e.modelRange=t.createRange(e.modelCursor,a),s.cursorParent?e.modelCursor=t.createPositionAt(s.cursorParent,0):e.modelCursor=e.modelRange.end}}function ug(t,e,n){if(n.consumable.test(e.viewItem,{name:!0})){const t=Array.from(e.viewItem.getChildren());for(const e of t)e.is("li")||e._remove()}}function fg(t,e,n){if(n.consumable.test(e.viewItem,{name:!0})){if(0===e.viewItem.childCount)return;const t=[...e.viewItem.getChildren()];let n=!1,o=!0;for(const e of t)!n||e.is("ul")||e.is("ol")||e._remove(),e.is("text")?(o&&(e._data=e.data.replace(/^\s+/,"")),(!e.nextSibling||e.nextSibling.is("ul")||e.nextSibling.is("ol"))&&(e._data=e.data.replace(/\s+$/,""))):(e.is("ul")||e.is("ol"))&&(n=!0),o=!1}}function pg(t){return(e,n)=>{if(n.isPhantom)return;const o=n.modelPosition.nodeBefore;if(o&&o.is("listItem")){const e=n.mapper.toViewElement(o),i=e.getAncestors().find(t=>t.is("ul")||t.is("ol")),r=t.createPositionAt(e,0).getWalker();for(const t of r){if("elementStart"==t.type&&t.item.is("li")){n.viewPosition=t.previousPosition;break}if("elementEnd"==t.type&&t.item==i){n.viewPosition=t.nextPosition;break}}}}}function gg(t,[e,n]){let o,i=e.is("documentFragment")?e.getChild(0):e;if(o=n?this.createSelection(n):this.document.selection,i&&i.is("listItem")){const t=o.getFirstPosition();let e=null;if(t.parent.is("listItem")?e=t.parent:t.nodeBefore&&t.nodeBefore.is("listItem")&&(e=t.nodeBefore),e){const t=e.getAttribute("listIndent");if(t>0)for(;i&&i.is("listItem");)i._setAttribute("listIndent",i.getAttribute("listIndent")+t),i=i.nextSibling}}}function mg(t,e){const n=!!e.sameIndent,o=!!e.smallerIndent,i=e.listIndent;let r=t;for(;r&&"listItem"==r.name;){const t=r.getAttribute("listIndent");if(n&&i==t||o&&i>t)return r;r=r.previousSibling}return null}function bg(t,e,n){return e&&n&&("ul"==e.name||"ol"==e.name)&&e.name==n.name?t.mergeContainers(t.createPositionAfter(e)):null}function wg(t,e,n,o){const i=e.parent,r=n.mapper,s=n.writer;let a=r.toViewPosition(o.createPositionBefore(t));const c=mg(t.previousSibling,{sameIndent:!0,smallerIndent:!0,listIndent:t.getAttribute("listIndent")}),l=t.previousSibling;if(c&&c.getAttribute("listIndent")==t.getAttribute("listIndent")){const t=r.toViewElement(c);a=s.breakContainer(s.createPositionAfter(t))}else a=l&&"listItem"==l.name?r.toViewPosition(o.createPositionAt(l,"end")):r.toViewPosition(o.createPositionBefore(t));if(a=vg(a),s.insert(a,i),l&&"listItem"==l.name){const t=r.toViewElement(l),n=s.createRange(s.createPositionAt(t,0),a).getWalker({ignoreElementEnd:!0});for(const t of n)if(t.item.is("li")){const o=s.breakContainer(s.createPositionBefore(t.item)),i=t.item.parent,r=s.createPositionAt(e,"end");bg(s,r.nodeBefore,r.nodeAfter),s.move(s.createRangeOn(i),r),n.position=o}}else{const n=i.nextSibling;if(n&&(n.is("ul")||n.is("ol"))){let o=null;for(const e of n.getChildren()){const n=r.toModelElement(e);if(!(n&&n.getAttribute("listIndent")>t.getAttribute("listIndent")))break;o=e}o&&(s.breakContainer(s.createPositionAfter(o)),s.move(s.createRangeOn(o.parent),s.createPositionAt(e,"end")))}}bg(s,i,i.nextSibling),bg(s,i.previousSibling,i)}function _g(t,e,n,o,i,r){const s=mg(e.nodeBefore,{sameIndent:!0,smallerIndent:!0,listIndent:t,foo:"b"}),a=i.mapper,c=i.writer,l=s?s.getAttribute("listIndent"):null;let d;if(s)if(l==t){const t=a.toViewElement(s).parent;d=c.createPositionAfter(t)}else{const t=r.createPositionAt(s,"end");d=a.toViewPosition(t)}else d=n;d=vg(d);for(const t of[...o.getChildren()])(t.is("ul")||t.is("ol"))&&(d=c.move(c.createRangeOn(t),d).end,bg(c,t,t.nextSibling),bg(c,t.previousSibling,t))}function vg(t){return t.getLastMatchingPosition(t=>t.item.is("uiElement"))}class kg extends Kc{static get requires(){return[Ef]}init(){const t=this.editor;t.model.schema.register("listItem",{inheritAllFrom:"$block",allowAttributes:["listType","listIndent"]});const e=t.data,n=t.editing;t.model.document.registerPostFixer(e=>(function(t,e){const n=t.document.differ.getChanges(),o=new Map;let i=!1;for(const t of n)if("insert"==t.type&&"listItem"==t.name)r(t.position);else if("insert"==t.type&&"listItem"!=t.name){if("$text"!=t.name){const n=t.position.nodeAfter;n.hasAttribute("listIndent")&&(e.removeAttribute("listIndent",n),i=!0),n.hasAttribute("listType")&&(e.removeAttribute("listType",n),i=!0)}r(t.position.getShiftedBy(t.length))}else"remove"==t.type&&"listItem"==t.name?r(t.position):"attribute"==t.type&&"listIndent"==t.attributeKey?r(t.range.start):"attribute"==t.type&&"listType"==t.attributeKey&&r(t.range.start);for(const t of o.values())s(t),a(t);return i;function r(t){const e=t.nodeBefore;if(e&&e.is("listItem")){let n=e;if(o.has(n))return;for(;n.previousSibling&&n.previousSibling.is("listItem");)if(n=n.previousSibling,o.has(n))return;o.set(t.nodeBefore,n)}else{const e=t.nodeAfter;e&&e.is("listItem")&&o.set(e,e)}}function s(t){let n=0,o=null;for(;t&&t.is("listItem");){const r=t.getAttribute("listIndent");if(r>n){let s;null===o?(o=r-n,s=n):(o>r&&(o=r),s=r-o),e.setAttribute("listIndent",s,t),i=!0}else o=null,n=t.getAttribute("listIndent")+1;t=t.nextSibling}}function a(t){let n=[],o=null;for(;t&&t.is("listItem");){const r=t.getAttribute("listIndent");if(o&&o.getAttribute("listIndent")>r&&(n=n.slice(0,r+1)),0!=r)if(n[r]){const o=n[r];t.getAttribute("listType")!=o&&(e.setAttribute("listType",o,t),i=!0)}else n[r]=t.getAttribute("listType");o=t,t=t.nextSibling}}})(t.model,e)),n.mapper.registerViewToModelLength("li",yg),e.mapper.registerViewToModelLength("li",yg),n.mapper.on("modelToViewPosition",pg(n.view)),n.mapper.on("viewToModelPosition",function(t){return(e,n)=>{const o=n.viewPosition,i=o.parent,r=n.mapper;if("ul"==i.name||"ol"==i.name){if(o.isAtEnd){const e=r.toModelElement(o.nodeBefore),i=r.getModelLength(o.nodeBefore);n.modelPosition=t.createPositionBefore(e).getShiftedBy(i)}else{const e=r.toModelElement(o.nodeAfter);n.modelPosition=t.createPositionBefore(e)}e.stop()}else if("li"==i.name&&o.nodeBefore&&("ul"==o.nodeBefore.name||"ol"==o.nodeBefore.name)){const s=r.toModelElement(i);let a=1,c=o.nodeBefore;for(;c&&(c.is("ul")||c.is("ol"));)a+=r.getModelLength(c),c=c.previousSibling;n.modelPosition=t.createPositionBefore(s).getShiftedBy(a),e.stop()}}}(t.model)),e.mapper.on("modelToViewPosition",pg(n.view)),n.downcastDispatcher.on("insert",lg,{priority:"high"}),n.downcastDispatcher.on("insert:listItem",rg(t.model)),e.downcastDispatcher.on("insert",lg,{priority:"high"}),e.downcastDispatcher.on("insert:listItem",rg(t.model)),n.downcastDispatcher.on("attribute:listType:listItem",ag),e.downcastDispatcher.on("attribute:listType:listItem",ag),n.downcastDispatcher.on("attribute:listIndent:listItem",cg(t.model)),e.downcastDispatcher.on("attribute:listIndent:listItem",cg(t.model)),n.downcastDispatcher.on("remove:listItem",sg(t.model)),n.downcastDispatcher.on("remove",dg,{priority:"low"}),e.downcastDispatcher.on("remove:listItem",sg(t.model)),e.downcastDispatcher.on("remove",dg,{priority:"low"}),e.upcastDispatcher.on("element:ul",ug,{priority:"high"}),e.upcastDispatcher.on("element:ol",ug,{priority:"high"}),e.upcastDispatcher.on("element:li",fg,{priority:"high"}),e.upcastDispatcher.on("element:li",hg),t.model.on("insertContent",gg,{priority:"high"}),t.commands.add("numberedList",new tg(t,"numbered")),t.commands.add("bulletedList",new tg(t,"bulleted")),t.commands.add("indentList",new og(t,"forward")),t.commands.add("outdentList",new og(t,"backward"));const o=this.editor.editing.view.document;this.listenTo(o,"enter",(t,e)=>{const n=this.editor.model.document,o=n.selection.getLastPosition().parent;n.selection.isCollapsed&&"listItem"==o.name&&o.isEmpty&&(this.editor.execute("outdentList"),e.preventDefault(),t.stop())}),this.listenTo(o,"delete",(t,e)=>{if("backward"!==e.direction)return;const n=this.editor.model.document.selection;if(!n.isCollapsed)return;const o=n.getFirstPosition();if(!o.isAtStart)return;const i=o.parent;"listItem"===i.name&&(i.previousSibling&&"listItem"===i.previousSibling.name||(this.editor.execute("outdentList"),e.preventDefault(),t.stop()))},{priority:"high"});const i=t=>(e,n)=>{this.editor.commands.get(t).isEnabled&&(this.editor.execute(t),n())};this.editor.keystrokes.set("Tab",i("indentList")),this.editor.keystrokes.set("Shift+Tab",i("outdentList"))}}function yg(t){let e=1;for(const n of t.getChildren())if("ul"==n.name||"ol"==n.name)for(const t of n.getChildren())e+=yg(t);return e}var xg=n(32),Ag=n.n(xg),Cg=n(31),Pg=n.n(Cg);class Tg extends Kc{init(){const t=this.editor.t;this._addButton("numberedList",t("aq"),Ag.a),this._addButton("bulletedList",t("ar"),Pg.a)}_addButton(t,e,n){const o=this.editor;o.ui.componentFactory.add(t,i=>{const r=o.commands.get(t),s=new qd(i);return s.set({label:e,icon:n,tooltip:!0}),s.bind("isOn","isEnabled").to(r,"value","isEnabled"),this.listenTo(s,"execute",()=>o.execute(t)),s})}}function Sg(t){return t.replace(/(\s+)<\/span>/g,(t,e)=>1===e.length?" ":Array(e.length+1).join("  ").substr(0,e.length))}function Eg(t){const e=new DOMParser,n=function(t){return Sg(Sg(t)).replace(/ <\//g," <\/o:p>/g," ").replace(/>(\s*(\r\n?|\n)\s*)+<")}(function(t){const e=t.match(/<\/body>(.*?)(<\/html>|$)/);e&&e[1]&&(t=t.slice(0,e.index)+t.slice(e.index).replace(e[1],""));return t}(t=t.replace(/\\n\\n\\n Svg Vector Icons : http://www.onlinewebfonts.com/icon \\n\\n\"","module.exports = \"\\n\\n\\t\\n\\t\\n\\t\\n\\n\"","module.exports = \"\\nimage/svg+xml\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\\n\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","module.exports = \"\"","import root from './_root.js';\n\n/** Detect free variable `exports`. */\nvar freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;\n\n/** Detect free variable `module`. */\nvar freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;\n\n/** Detect the popular CommonJS extension `module.exports`. */\nvar moduleExports = freeModule && freeModule.exports === freeExports;\n\n/** Built-in value references. */\nvar Buffer = moduleExports ? root.Buffer : undefined,\n allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined;\n\n/**\n * Creates a clone of `buffer`.\n *\n * @private\n * @param {Buffer} buffer The buffer to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Buffer} Returns the cloned buffer.\n */\nfunction cloneBuffer(buffer, isDeep) {\n if (isDeep) {\n return buffer.slice();\n }\n var length = buffer.length,\n result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);\n\n buffer.copy(result);\n return result;\n}\n\nexport default cloneBuffer;\n","/**\n * This method returns `false`.\n *\n * @static\n * @memberOf _\n * @since 4.13.0\n * @category Util\n * @returns {boolean} Returns `false`.\n * @example\n *\n * _.times(2, _.stubFalse);\n * // => [false, false]\n */\nfunction stubFalse() {\n return false;\n}\n\nexport default stubFalse;\n","import root from './_root.js';\n\n/** Built-in value references. */\nvar Symbol = root.Symbol;\n\nexport default Symbol;\n","import Symbol from './_Symbol.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar nativeObjectToString = objectProto.toString;\n\n/** Built-in value references. */\nvar symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n/**\n * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the raw `toStringTag`.\n */\nfunction getRawTag(value) {\n var isOwn = hasOwnProperty.call(value, symToStringTag),\n tag = value[symToStringTag];\n\n try {\n value[symToStringTag] = undefined;\n var unmasked = true;\n } catch (e) {}\n\n var result = nativeObjectToString.call(value);\n if (unmasked) {\n if (isOwn) {\n value[symToStringTag] = tag;\n } else {\n delete value[symToStringTag];\n }\n }\n return result;\n}\n\nexport default getRawTag;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar nativeObjectToString = objectProto.toString;\n\n/**\n * Converts `value` to a string using `Object.prototype.toString`.\n *\n * @private\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n */\nfunction objectToString(value) {\n return nativeObjectToString.call(value);\n}\n\nexport default objectToString;\n","import Symbol from './_Symbol.js';\nimport getRawTag from './_getRawTag.js';\nimport objectToString from './_objectToString.js';\n\n/** `Object#toString` result references. */\nvar nullTag = '[object Null]',\n undefinedTag = '[object Undefined]';\n\n/** Built-in value references. */\nvar symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n/**\n * The base implementation of `getTag` without fallbacks for buggy environments.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\nfunction baseGetTag(value) {\n if (value == null) {\n return value === undefined ? undefinedTag : nullTag;\n }\n return (symToStringTag && symToStringTag in Object(value))\n ? getRawTag(value)\n : objectToString(value);\n}\n\nexport default baseGetTag;\n","/**\n * Creates a unary function that invokes `func` with its argument transformed.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {Function} transform The argument transform.\n * @returns {Function} Returns the new function.\n */\nfunction overArg(func, transform) {\n return function(arg) {\n return func(transform(arg));\n };\n}\n\nexport default overArg;\n","import overArg from './_overArg.js';\n\n/** Built-in value references. */\nvar getPrototype = overArg(Object.getPrototypeOf, Object);\n\nexport default getPrototype;\n","/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n return value != null && typeof value == 'object';\n}\n\nexport default isObjectLike;\n","import baseGetTag from './_baseGetTag.js';\nimport getPrototype from './_getPrototype.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar funcProto = Function.prototype,\n objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to infer the `Object` constructor. */\nvar objectCtorString = funcToString.call(Object);\n\n/**\n * Checks if `value` is a plain object, that is, an object created by the\n * `Object` constructor or one with a `[[Prototype]]` of `null`.\n *\n * @static\n * @memberOf _\n * @since 0.8.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * _.isPlainObject(new Foo);\n * // => false\n *\n * _.isPlainObject([1, 2, 3]);\n * // => false\n *\n * _.isPlainObject({ 'x': 0, 'y': 0 });\n * // => true\n *\n * _.isPlainObject(Object.create(null));\n * // => true\n */\nfunction isPlainObject(value) {\n if (!isObjectLike(value) || baseGetTag(value) != objectTag) {\n return false;\n }\n var proto = getPrototype(value);\n if (proto === null) {\n return true;\n }\n var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;\n return typeof Ctor == 'function' && Ctor instanceof Ctor &&\n funcToString.call(Ctor) == objectCtorString;\n}\n\nexport default isPlainObject;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/config\n */\n\nimport { isPlainObject } from 'lodash-es';\n\n/**\n * Handles a configuration dictionary.\n */\nexport default class Config {\n\t/**\n\t * Creates an instance of the {@link ~Config} class.\n\t *\n\t * @param {Object} [configurations] The initial configurations to be set. Usually, provided by the user.\n\t * @param {Object} [defaultConfigurations] The default configurations. Usually, provided by the system.\n\t */\n\tconstructor( configurations, defaultConfigurations ) {\n\t\t/**\n\t\t * Store for the whole configuration.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {};\n\n\t\t// Set default configuration.\n\t\tif ( defaultConfigurations ) {\n\t\t\tthis.define( defaultConfigurations );\n\t\t}\n\n\t\t// Set initial configuration.\n\t\tif ( configurations ) {\n\t\t\tthis._setObjectToTarget( this._config, configurations );\n\t\t}\n\t}\n\n\t/**\n\t * Set configuration values.\n\t *\n\t * It accepts both a name/value pair or an object, which properties and values will be used to set\n\t * configurations.\n\t *\n\t * It also accepts setting a \"deep configuration\" by using dots in the name. For example, `'resize.width'` sets\n\t * the value for the `width` configuration in the `resize` subset.\n\t *\n\t *\t\tconfig.set( 'width', 500 );\n\t *\t\tconfig.set( 'toolbar.collapsed', true );\n\t *\n\t *\t\t// Equivalent to:\n\t *\t\tconfig.set( {\n\t *\t\t\twidth: 500\n\t *\t\t\ttoolbar: {\n\t *\t\t\t\tcollapsed: true\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Passing an object as the value will amend the configuration, not replace it.\n\t *\n\t *\t\tconfig.set( 'toolbar', {\n\t *\t\t\tcollapsed: true,\n\t *\t\t} );\n\t *\n\t *\t\tconfig.set( 'toolbar', {\n\t *\t\t\tcolor: 'red',\n\t *\t\t} );\n\t *\n\t *\t\tconfig.get( 'toolbar.collapsed' ); // true\n\t *\t\tconfig.get( 'toolbar.color' ); // 'red'\n\t *\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t */\n\tset( name, value ) {\n\t\tthis._setToTarget( this._config, name, value );\n\t}\n\n\t/**\n\t * Does exactly the same as {@link #set} with one exception – passed configuration extends\n\t * existing one, but does not overwrite already defined values.\n\t *\n\t * This method is supposed to be called by plugin developers to setup plugin's configurations. It would be\n\t * rarely used for other needs.\n\t *\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t */\n\tdefine( name, value ) {\n\t\tconst isDefine = true;\n\n\t\tthis._setToTarget( this._config, name, value, isDefine );\n\t}\n\n\t/**\n\t * Gets the value for a configuration entry.\n\t *\n\t *\t\tconfig.get( 'name' );\n\t *\n\t * Deep configurations can be retrieved by separating each part with a dot.\n\t *\n\t *\t\tconfig.get( 'toolbar.collapsed' );\n\t *\n\t * @param {String} name The configuration name. Configuration names are case-sensitive.\n\t * @returns {*} The configuration value or `undefined` if the configuration entry was not found.\n\t */\n\tget( name ) {\n\t\treturn this._getFromSource( this._config, name );\n\t}\n\n\t/**\n\t * Saves passed configuration to the specified target (nested object).\n\t *\n\t * @private\n\t * @param {Object} target Nested config object.\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t * @param {Boolean} [isDefine=false] Define if passed configuration should overwrite existing one.\n\t */\n\t_setToTarget( target, name, value, isDefine = false ) {\n\t\t// In case of an object, iterate through it and call `_setToTarget` again for each property.\n\t\tif ( isPlainObject( name ) ) {\n\t\t\tthis._setObjectToTarget( target, name, isDefine );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// The configuration name should be split into parts if it has dots. E.g. `resize.width` -> [`resize`, `width`].\n\t\tconst parts = name.split( '.' );\n\n\t\t// Take the name of the configuration out of the parts. E.g. `resize.width` -> `width`.\n\t\tname = parts.pop();\n\n\t\t// Iterate over parts to check if currently stored configuration has proper structure.\n\t\tfor ( const part of parts ) {\n\t\t\t// If there is no object for specified part then create one.\n\t\t\tif ( !isPlainObject( target[ part ] ) ) {\n\t\t\t\ttarget[ part ] = {};\n\t\t\t}\n\n\t\t\t// Nested object becomes a target.\n\t\t\ttarget = target[ part ];\n\t\t}\n\n\t\t// In case of value is an object.\n\t\tif ( isPlainObject( value ) ) {\n\t\t\t// We take care of proper config structure.\n\t\t\tif ( !isPlainObject( target[ name ] ) ) {\n\t\t\t\ttarget[ name ] = {};\n\t\t\t}\n\n\t\t\ttarget = target[ name ];\n\n\t\t\t// And iterate through this object calling `_setToTarget` again for each property.\n\t\t\tthis._setObjectToTarget( target, value, isDefine );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Do nothing if we are defining configuration for non empty name.\n\t\tif ( isDefine && typeof target[ name ] != 'undefined' ) {\n\t\t\treturn;\n\t\t}\n\n\t\ttarget[ name ] = value;\n\t}\n\n\t/**\n\t * Get specified configuration from specified source (nested object).\n\t *\n\t * @private\n\t * @param {Object} source level of nested object.\n\t * @param {String} name The configuration name. Configuration names are case-sensitive.\n\t * @returns {*} The configuration value or `undefined` if the configuration entry was not found.\n\t */\n\t_getFromSource( source, name ) {\n\t\t// The configuration name should be split into parts if it has dots. E.g. `resize.width` -> [`resize`, `width`].\n\t\tconst parts = name.split( '.' );\n\n\t\t// Take the name of the configuration out of the parts. E.g. `resize.width` -> `width`.\n\t\tname = parts.pop();\n\n\t\t// Iterate over parts to check if currently stored configuration has proper structure.\n\t\tfor ( const part of parts ) {\n\t\t\tif ( !isPlainObject( source[ part ] ) ) {\n\t\t\t\tsource = null;\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Nested object becomes a source.\n\t\t\tsource = source[ part ];\n\t\t}\n\n\t\t// Always returns undefined for non existing configuration\n\t\treturn source ? source[ name ] : undefined;\n\t}\n\n\t/**\n\t * Iterates through passed object and calls {@link #_setToTarget} method with object key and value for each property.\n\t *\n\t * @private\n\t * @param {Object} target Nested config object.\n\t * @param {Object} configuration Configuration data set\n\t * @param {Boolean} [isDefine] Defines if passed configuration is default configuration or not.\n\t */\n\t_setObjectToTarget( target, configuration, isDefine ) {\n\t\tObject.keys( configuration ).forEach( key => {\n\t\t\tthis._setToTarget( target, key, configuration[ key ], isDefine );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/spy\n */\n\n/**\n * Creates a spy function (ala Sinon.js) that can be used to inspect call to it.\n *\n * The following are the present features:\n *\n * * spy.called: property set to `true` if the function has been called at least once.\n *\n * @returns {Function} The spy function.\n */\nfunction spy() {\n\treturn function spy() {\n\t\tspy.called = true;\n\t};\n}\n\nexport default spy;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/eventinfo\n */\n\nimport spy from './spy';\n\n/**\n * The event object passed to event callbacks. It is used to provide information about the event as well as a tool to\n * manipulate it.\n */\nexport default class EventInfo {\n\t/**\n\t * @param {Object} source The emitter.\n\t * @param {String} name The event name.\n\t */\n\tconstructor( source, name ) {\n\t\t/**\n\t\t * The object that fired the event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Object}\n\t\t */\n\t\tthis.source = source;\n\n\t\t/**\n\t\t * The event name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Path this event has followed. See {@link module:utils/emittermixin~EmitterMixin#delegate}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.}\n\t\t */\n\t\tthis.path = [];\n\n\t\t// The following methods are defined in the constructor because they must be re-created per instance.\n\n\t\t/**\n\t\t * Stops the event emitter to call further callbacks for this event interaction.\n\t\t *\n\t\t * @method #stop\n\t\t */\n\t\tthis.stop = spy();\n\n\t\t/**\n\t\t * Removes the current callback from future interactions of this event.\n\t\t *\n\t\t * @method #off\n\t\t */\n\t\tthis.off = spy();\n\n\t\t/**\n\t\t * The value which will be returned by {@link module:utils/emittermixin~EmitterMixin#fire}.\n\t\t *\n\t\t * It's `undefined` by default and can be changed by an event listener:\n\t\t *\n\t\t *\t\tdataController.fire( 'getSelectedContent', ( evt ) => {\n\t\t *\t\t\t// This listener will make `dataController.fire( 'getSelectedContent' )`\n\t\t *\t\t\t// always return an empty DocumentFragment.\n\t\t *\t\t\tevt.return = new DocumentFragment();\n\t\t *\n\t\t *\t\t\t// Make sure no other listeners are executed.\n\t\t *\t\t\tevt.stop();\n\t\t *\t\t} );\n\t\t *\n\t\t * @member #return\n\t\t */\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/uid\n */\n\n/**\n * Returns a unique id. This id consist of an 'e' character and a randomly generated string of 32 aphanumeric characters.\n * Each character in uid string represents a hexadecimal digit (base 16).\n *\n * @returns {String} A hexadecimal number representing the id.\n */\nexport default function uid() {\n\tlet uuid = 'e'; // Make sure that id does not start with number.\n\n\tfor ( let i = 0; i < 8; i++ ) {\n\t\tuuid += Math.floor( ( 1 + Math.random() ) * 0x10000 ).toString( 16 ).substring( 1 );\n\t}\n\n\treturn uuid;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/priorities\n */\n\n/**\n * String representing a priority value.\n *\n * @typedef {'highest'|'high'|'normal'|'low'|'lowest'} module:utils/priorities~PriorityString\n */\n\n/**\n * Provides group of constants to use instead of hardcoding numeric priority values.\n *\n * @namespace\n */\nconst priorities = {\n\t/**\n\t * Converts a string with priority name to it's numeric value. If `Number` is given, it just returns it.\n\t *\n\t * @static\n\t * @param {module:utils/priorities~PriorityString|Number} priority Priority to convert.\n\t * @returns {Number} Converted priority.\n\t */\n\tget( priority ) {\n\t\tif ( typeof priority != 'number' ) {\n\t\t\treturn this[ priority ] || this.normal;\n\t\t} else {\n\t\t\treturn priority;\n\t\t}\n\t},\n\n\thighest: 100000,\n\thigh: 1000,\n\tnormal: 0,\n\tlow: -1000,\n\tlowest: -100000\n};\n\nexport default priorities;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/emittermixin\n */\n\nimport EventInfo from './eventinfo';\nimport uid from './uid';\nimport priorities from './priorities';\n\nconst _listeningTo = Symbol( 'listeningTo' );\nconst _emitterId = Symbol( 'emitterId' );\n\n/**\n * Mixin that injects the {@link ~Emitter events API} into its host.\n *\n * @mixin EmitterMixin\n * @implements module:utils/emittermixin~Emitter\n */\nconst EmitterMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\ton( event, callback, options = {} ) {\n\t\tthis.listenTo( this, event, callback, options );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tonce( event, callback, options ) {\n\t\tconst onceCallback = function( event, ...args ) {\n\t\t\t// Go off() at the first call.\n\t\t\tevent.off();\n\n\t\t\t// Go with the original callback.\n\t\t\tcallback.call( this, event, ...args );\n\t\t};\n\n\t\t// Make a similar on() call, simply replacing the callback.\n\t\tthis.listenTo( this, event, onceCallback, options );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\toff( event, callback ) {\n\t\tthis.stopListening( this, event, callback );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tlistenTo( emitter, event, callback, options = {} ) {\n\t\tlet emitterInfo, eventCallbacks;\n\n\t\t// _listeningTo contains a list of emitters that this object is listening to.\n\t\t// This list has the following format:\n\t\t//\n\t\t// _listeningTo: {\n\t\t// emitterId: {\n\t\t// emitter: emitter,\n\t\t// callbacks: {\n\t\t// event1: [ callback1, callback2, ... ]\n\t\t// ....\n\t\t// }\n\t\t// },\n\t\t// ...\n\t\t// }\n\n\t\tif ( !this[ _listeningTo ] ) {\n\t\t\tthis[ _listeningTo ] = {};\n\t\t}\n\n\t\tconst emitters = this[ _listeningTo ];\n\n\t\tif ( !_getEmitterId( emitter ) ) {\n\t\t\t_setEmitterId( emitter );\n\t\t}\n\n\t\tconst emitterId = _getEmitterId( emitter );\n\n\t\tif ( !( emitterInfo = emitters[ emitterId ] ) ) {\n\t\t\temitterInfo = emitters[ emitterId ] = {\n\t\t\t\temitter,\n\t\t\t\tcallbacks: {}\n\t\t\t};\n\t\t}\n\n\t\tif ( !( eventCallbacks = emitterInfo.callbacks[ event ] ) ) {\n\t\t\teventCallbacks = emitterInfo.callbacks[ event ] = [];\n\t\t}\n\n\t\teventCallbacks.push( callback );\n\n\t\t// Finally register the callback to the event.\n\t\tcreateEventNamespace( emitter, event );\n\t\tconst lists = getCallbacksListsForNamespace( emitter, event );\n\t\tconst priority = priorities.get( options.priority );\n\n\t\tconst callbackDefinition = {\n\t\t\tcallback,\n\t\t\tpriority\n\t\t};\n\n\t\t// Add the callback to all callbacks list.\n\t\tfor ( const callbacks of lists ) {\n\t\t\t// Add the callback to the list in the right priority position.\n\t\t\tlet added = false;\n\n\t\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\t\tif ( callbacks[ i ].priority < priority ) {\n\t\t\t\t\tcallbacks.splice( i, 0, callbackDefinition );\n\t\t\t\t\tadded = true;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Add at the end, if right place was not found.\n\t\t\tif ( !added ) {\n\t\t\t\tcallbacks.push( callbackDefinition );\n\t\t\t}\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\tconst emitters = this[ _listeningTo ];\n\t\tlet emitterId = emitter && _getEmitterId( emitter );\n\t\tconst emitterInfo = emitters && emitterId && emitters[ emitterId ];\n\t\tconst eventCallbacks = emitterInfo && event && emitterInfo.callbacks[ event ];\n\n\t\t// Stop if nothing has been listened.\n\t\tif ( !emitters || ( emitter && !emitterInfo ) || ( event && !eventCallbacks ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// All params provided. off() that single callback.\n\t\tif ( callback ) {\n\t\t\tremoveCallback( emitter, event, callback );\n\t\t}\n\t\t// Only `emitter` and `event` provided. off() all callbacks for that event.\n\t\telse if ( eventCallbacks ) {\n\t\t\twhile ( ( callback = eventCallbacks.pop() ) ) {\n\t\t\t\tremoveCallback( emitter, event, callback );\n\t\t\t}\n\n\t\t\tdelete emitterInfo.callbacks[ event ];\n\t\t}\n\t\t// Only `emitter` provided. off() all events for that emitter.\n\t\telse if ( emitterInfo ) {\n\t\t\tfor ( event in emitterInfo.callbacks ) {\n\t\t\t\tthis.stopListening( emitter, event );\n\t\t\t}\n\t\t\tdelete emitters[ emitterId ];\n\t\t}\n\t\t// No params provided. off() all emitters.\n\t\telse {\n\t\t\tfor ( emitterId in emitters ) {\n\t\t\t\tthis.stopListening( emitters[ emitterId ].emitter );\n\t\t\t}\n\t\t\tdelete this[ _listeningTo ];\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tfire( eventOrInfo, ...args ) {\n\t\tconst eventInfo = eventOrInfo instanceof EventInfo ? eventOrInfo : new EventInfo( this, eventOrInfo );\n\t\tconst event = eventInfo.name;\n\t\tlet callbacks = getCallbacksForEvent( this, event );\n\n\t\t// Record that the event passed this emitter on its path.\n\t\teventInfo.path.push( this );\n\n\t\t// Handle event listener callbacks first.\n\t\tif ( callbacks ) {\n\t\t\t// Arguments passed to each callback.\n\t\t\tconst callbackArgs = [ eventInfo, ...args ];\n\n\t\t\t// Copying callbacks array is the easiest and most secure way of preventing infinite loops, when event callbacks\n\t\t\t// are added while processing other callbacks. Previous solution involved adding counters (unique ids) but\n\t\t\t// failed if callbacks were added to the queue before currently processed callback.\n\t\t\t// If this proves to be too inefficient, another method is to change `.on()` so callbacks are stored if same\n\t\t\t// event is currently processed. Then, `.fire()` at the end, would have to add all stored events.\n\t\t\tcallbacks = Array.from( callbacks );\n\n\t\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\t\tcallbacks[ i ].callback.apply( this, callbackArgs );\n\n\t\t\t\t// Remove the callback from future requests if off() has been called.\n\t\t\t\tif ( eventInfo.off.called ) {\n\t\t\t\t\t// Remove the called mark for the next calls.\n\t\t\t\t\tdelete eventInfo.off.called;\n\n\t\t\t\t\tremoveCallback( this, event, callbacks[ i ].callback );\n\t\t\t\t}\n\n\t\t\t\t// Do not execute next callbacks if stop() was called.\n\t\t\t\tif ( eventInfo.stop.called ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Delegate event to other emitters if needed.\n\t\tif ( this._delegations ) {\n\t\t\tconst destinations = this._delegations.get( event );\n\t\t\tconst passAllDestinations = this._delegations.get( '*' );\n\n\t\t\tif ( destinations ) {\n\t\t\t\tfireDelegatedEvents( destinations, eventInfo, args );\n\t\t\t}\n\n\t\t\tif ( passAllDestinations ) {\n\t\t\t\tfireDelegatedEvents( passAllDestinations, eventInfo, args );\n\t\t\t}\n\t\t}\n\n\t\treturn eventInfo.return;\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdelegate( ...events ) {\n\t\treturn {\n\t\t\tto: ( emitter, nameOrFunction ) => {\n\t\t\t\tif ( !this._delegations ) {\n\t\t\t\t\tthis._delegations = new Map();\n\t\t\t\t}\n\n\t\t\t\tfor ( const eventName of events ) {\n\t\t\t\t\tconst destinations = this._delegations.get( eventName );\n\n\t\t\t\t\tif ( !destinations ) {\n\t\t\t\t\t\tthis._delegations.set( eventName, new Map( [ [ emitter, nameOrFunction ] ] ) );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tdestinations.set( emitter, nameOrFunction );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstopDelegating( event, emitter ) {\n\t\tif ( !this._delegations ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !event ) {\n\t\t\tthis._delegations.clear();\n\t\t} else if ( !emitter ) {\n\t\t\tthis._delegations.delete( event );\n\t\t} else {\n\t\t\tconst destinations = this._delegations.get( event );\n\n\t\t\tif ( destinations ) {\n\t\t\t\tdestinations.delete( emitter );\n\t\t\t}\n\t\t}\n\t}\n};\n\nexport default EmitterMixin;\n\n/**\n * Emitter/listener interface.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/emittermixin~EmitterMixin} mixin.\n *\n * @interface Emitter\n */\n\n/**\n * Registers a callback function to be executed when an event is fired.\n *\n * Shorthand for {@link #listenTo `this.listenTo( this, event, callback, options )`} (it makes the emitter\n * listen on itself).\n *\n * @method #on\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Registers a callback function to be executed on the next time the event is fired only. This is similar to\n * calling {@link #on} followed by {@link #off} in the callback.\n *\n * @method #once\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Stops executing the callback on the given event.\n * Shorthand for {@link #stopListening `this.stopListening( this, event, callback )`}.\n *\n * @method #off\n * @param {String} event The name of the event.\n * @param {Function} callback The function to stop being called.\n */\n\n/**\n * Registers a callback function to be executed when an event is fired in a specific (emitter) object.\n *\n * Events can be grouped in namespaces using `:`.\n * When namespaced event is fired, it additionally fires all callbacks for that namespace.\n *\n *\t\t// myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).\n *\t\tmyEmitter.on( 'myGroup', genericCallback );\n *\t\tmyEmitter.on( 'myGroup:myEvent', specificCallback );\n *\n *\t\t// genericCallback is fired.\n *\t\tmyEmitter.fire( 'myGroup' );\n *\t\t// both genericCallback and specificCallback are fired.\n *\t\tmyEmitter.fire( 'myGroup:myEvent' );\n *\t\t// genericCallback is fired even though there are no callbacks for \"foo\".\n *\t\tmyEmitter.fire( 'myGroup:foo' );\n *\n * An event callback can {@link module:utils/eventinfo~EventInfo#stop stop the event} and\n * set the {@link module:utils/eventinfo~EventInfo#return return value} of the {@link #fire} method.\n *\n * @method #listenTo\n * @param {module:utils/emittermixin~Emitter} emitter The object that fires the event.\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Stops listening for events. It can be used at different levels:\n *\n * * To stop listening to a specific callback.\n * * To stop listening to a specific event.\n * * To stop listening to all events fired by a specific object.\n * * To stop listening to all events fired by all objects.\n *\n * @method #stopListening\n * @param {module:utils/emittermixin~Emitter} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n * for all events from `emitter`.\n * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n * `event`.\n */\n\n/**\n * Fires an event, executing all callbacks registered for it.\n *\n * The first parameter passed to callbacks is an {@link module:utils/eventinfo~EventInfo} object,\n * followed by the optional `args` provided in the `fire()` method call.\n *\n * @method #fire\n * @param {String|module:utils/eventinfo~EventInfo} eventOrInfo The name of the event or `EventInfo` object if event is delegated.\n * @param {...*} [args] Additional arguments to be passed to the callbacks.\n * @returns {*} By default the method returns `undefined`. However, the return value can be changed by listeners\n * through modification of the {@link module:utils/eventinfo~EventInfo#return `evt.return`}'s property (the event info\n * is the first param of every callback).\n */\n\n/**\n * Delegates selected events to another {@link module:utils/emittermixin~Emitter}. For instance:\n *\n *\t\temitterA.delegate( 'eventX' ).to( emitterB );\n *\t\temitterA.delegate( 'eventX', 'eventY' ).to( emitterC );\n *\n * then `eventX` is delegated (fired by) `emitterB` and `emitterC` along with `data`:\n *\n *\t\temitterA.fire( 'eventX', data );\n *\n * and `eventY` is delegated (fired by) `emitterC` along with `data`:\n *\n *\t\temitterA.fire( 'eventY', data );\n *\n * @method #delegate\n * @param {...String} events Event names that will be delegated to another emitter.\n * @returns {module:utils/emittermixin~EmitterMixinDelegateChain}\n */\n\n/**\n * Stops delegating events. It can be used at different levels:\n *\n * * To stop delegating all events.\n * * To stop delegating a specific event to all emitters.\n * * To stop delegating a specific event to a specific emitter.\n *\n * @method #stopDelegating\n * @param {String} [event] The name of the event to stop delegating. If omitted, stops it all delegations.\n * @param {module:utils/emittermixin~Emitter} [emitter] (requires `event`) The object to stop delegating a particular event to.\n * If omitted, stops delegation of `event` to all emitters.\n */\n\n/**\n * Checks if `listeningEmitter` listens to an emitter with given `listenedToEmitterId` and if so, returns that emitter.\n * If not, returns `null`.\n *\n * @protected\n * @param {module:utils/emittermixin~EmitterMixin} listeningEmitter Emitter that listens.\n * @param {String} listenedToEmitterId Unique emitter id of emitter listened to.\n * @returns {module:utils/emittermixin~EmitterMixin|null}\n */\nexport function _getEmitterListenedTo( listeningEmitter, listenedToEmitterId ) {\n\tif ( listeningEmitter[ _listeningTo ] && listeningEmitter[ _listeningTo ][ listenedToEmitterId ] ) {\n\t\treturn listeningEmitter[ _listeningTo ][ listenedToEmitterId ].emitter;\n\t}\n\n\treturn null;\n}\n\n/**\n * Sets emitter's unique id.\n *\n * **Note:** `_emitterId` can be set only once.\n *\n * @protected\n * @param {module:utils/emittermixin~EmitterMixin} emitter Emitter for which id will be set.\n * @param {String} [id] Unique id to set. If not passed, random unique id will be set.\n */\nexport function _setEmitterId( emitter, id ) {\n\tif ( !emitter[ _emitterId ] ) {\n\t\temitter[ _emitterId ] = id || uid();\n\t}\n}\n\n/**\n * Returns emitter's unique id.\n *\n * @protected\n * @param {module:utils/emittermixin~EmitterMixin} emitter Emitter which id will be returned.\n */\nexport function _getEmitterId( emitter ) {\n\treturn emitter[ _emitterId ];\n}\n\n// Gets the internal `_events` property of the given object.\n// `_events` property store all lists with callbacks for registered event names.\n// If there were no events registered on the object, empty `_events` object is created.\nfunction getEvents( source ) {\n\tif ( !source._events ) {\n\t\tObject.defineProperty( source, '_events', {\n\t\t\tvalue: {}\n\t\t} );\n\t}\n\n\treturn source._events;\n}\n\n// Creates event node for generic-specific events relation architecture.\nfunction makeEventNode() {\n\treturn {\n\t\tcallbacks: [],\n\t\tchildEvents: []\n\t};\n}\n\n// Creates an architecture for generic-specific events relation.\n// If needed, creates all events for given eventName, i.e. if the first registered event\n// is foo:bar:abc, it will create foo:bar:abc, foo:bar and foo event and tie them together.\n// It also copies callbacks from more generic events to more specific events when\n// specific events are created.\nfunction createEventNamespace( source, eventName ) {\n\tconst events = getEvents( source );\n\n\t// First, check if the event we want to add to the structure already exists.\n\tif ( events[ eventName ] ) {\n\t\t// If it exists, we don't have to do anything.\n\t\treturn;\n\t}\n\n\t// In other case, we have to create the structure for the event.\n\t// Note, that we might need to create intermediate events too.\n\t// I.e. if foo:bar:abc is being registered and we only have foo in the structure,\n\t// we need to also register foo:bar.\n\n\t// Currently processed event name.\n\tlet name = eventName;\n\t// Name of the event that is a child event for currently processed event.\n\tlet childEventName = null;\n\n\t// Array containing all newly created specific events.\n\tconst newEventNodes = [];\n\n\t// While loop can't check for ':' index because we have to handle generic events too.\n\t// In each loop, we truncate event name, going from the most specific name to the generic one.\n\t// I.e. foo:bar:abc -> foo:bar -> foo.\n\twhile ( name !== '' ) {\n\t\tif ( events[ name ] ) {\n\t\t\t// If the currently processed event name is already registered, we can be sure\n\t\t\t// that it already has all the structure created, so we can break the loop here\n\t\t\t// as no more events need to be registered.\n\t\t\tbreak;\n\t\t}\n\n\t\t// If this event is not yet registered, create a new object for it.\n\t\tevents[ name ] = makeEventNode();\n\t\t// Add it to the array with newly created events.\n\t\tnewEventNodes.push( events[ name ] );\n\n\t\t// Add previously processed event name as a child of this event.\n\t\tif ( childEventName ) {\n\t\t\tevents[ name ].childEvents.push( childEventName );\n\t\t}\n\n\t\tchildEventName = name;\n\t\t// If `.lastIndexOf()` returns -1, `.substr()` will return '' which will break the loop.\n\t\tname = name.substr( 0, name.lastIndexOf( ':' ) );\n\t}\n\n\tif ( name !== '' ) {\n\t\t// If name is not empty, we found an already registered event that was a parent of the\n\t\t// event we wanted to register.\n\n\t\t// Copy that event's callbacks to newly registered events.\n\t\tfor ( const node of newEventNodes ) {\n\t\t\tnode.callbacks = events[ name ].callbacks.slice();\n\t\t}\n\n\t\t// Add last newly created event to the already registered event.\n\t\tevents[ name ].childEvents.push( childEventName );\n\t}\n}\n\n// Gets an array containing callbacks list for a given event and it's more specific events.\n// I.e. if given event is foo:bar and there is also foo:bar:abc event registered, this will\n// return callback list of foo:bar and foo:bar:abc (but not foo).\nfunction getCallbacksListsForNamespace( source, eventName ) {\n\tconst eventNode = getEvents( source )[ eventName ];\n\n\tif ( !eventNode ) {\n\t\treturn [];\n\t}\n\n\tlet callbacksLists = [ eventNode.callbacks ];\n\n\tfor ( let i = 0; i < eventNode.childEvents.length; i++ ) {\n\t\tconst childCallbacksLists = getCallbacksListsForNamespace( source, eventNode.childEvents[ i ] );\n\n\t\tcallbacksLists = callbacksLists.concat( childCallbacksLists );\n\t}\n\n\treturn callbacksLists;\n}\n\n// Get the list of callbacks for a given event, but only if there any callbacks have been registered.\n// If there are no callbacks registered for given event, it checks if this is a specific event and looks\n// for callbacks for it's more generic version.\nfunction getCallbacksForEvent( source, eventName ) {\n\tlet event;\n\n\tif ( !source._events || !( event = source._events[ eventName ] ) || !event.callbacks.length ) {\n\t\t// There are no callbacks registered for specified eventName.\n\t\t// But this could be a specific-type event that is in a namespace.\n\t\tif ( eventName.indexOf( ':' ) > -1 ) {\n\t\t\t// If the eventName is specific, try to find callback lists for more generic event.\n\t\t\treturn getCallbacksForEvent( source, eventName.substr( 0, eventName.lastIndexOf( ':' ) ) );\n\t\t} else {\n\t\t\t// If this is a top-level generic event, return null;\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn event.callbacks;\n}\n\n// Fires delegated events for given map of destinations.\n//\n// @private\n// * @param {Map.} destinations A map containing `[ {@link utils.Emitter}, \"event name\" ]` pair destinations.\n// * @param {utils.EventInfo} eventInfo The original event info object.\n// * @param {Array.<*>} fireArgs Arguments the original event was fired with.\nfunction fireDelegatedEvents( destinations, eventInfo, fireArgs ) {\n\tfor ( let [ emitter, name ] of destinations ) {\n\t\tif ( !name ) {\n\t\t\tname = eventInfo.name;\n\t\t} else if ( typeof name == 'function' ) {\n\t\t\tname = name( eventInfo.name );\n\t\t}\n\n\t\tconst delegatedInfo = new EventInfo( eventInfo.source, name );\n\n\t\tdelegatedInfo.path = [ ...eventInfo.path ];\n\n\t\temitter.fire( delegatedInfo, ...fireArgs );\n\t}\n}\n\n// Removes callback from emitter for given event.\n//\n// @param {module:utils/emittermixin~Emitter} emitter\n// @param {String} event\n// @param {Function} callback\nfunction removeCallback( emitter, event, callback ) {\n\tconst lists = getCallbacksListsForNamespace( emitter, event );\n\n\tfor ( const callbacks of lists ) {\n\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\tif ( callbacks[ i ].callback == callback ) {\n\t\t\t\t// Remove the callback from the list (fixing the next index).\n\t\t\t\tcallbacks.splice( i, 1 );\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * The return value of {@link ~EmitterMixin#delegate}.\n *\n * @interface module:utils/emittermixin~EmitterMixinDelegateChain\n */\n\n/**\n * Selects destination for {@link module:utils/emittermixin~EmitterMixin#delegate} events.\n *\n * @method #to\n * @param {module:utils/emittermixin~Emitter} emitter An `EmitterMixin` instance which is the destination for delegated events.\n * @param {String|Function} [nameOrFunction] A custom event name or function which converts the original name string.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/mix\n */\n\n/**\n * Copies enumerable properties and symbols from the objects given as 2nd+ parameters to the\n * prototype of first object (a constructor).\n *\n *\t\tclass Editor {\n *\t\t\t...\n *\t\t}\n *\n *\t\tconst SomeMixin = {\n *\t\t\ta() {\n *\t\t\t\treturn 'a';\n *\t\t\t}\n *\t\t};\n *\n *\t\tmix( Editor, SomeMixin, ... );\n *\n *\t\tnew Editor().a(); // -> 'a'\n *\n * Note: Properties which already exist in the base class will not be overriden.\n *\n * @param {Function} [baseClass] Class which prototype will be extended.\n * @param {Object} [...mixins] Objects from which to get properties.\n */\nexport default function mix( baseClass, ...mixins ) {\n\tmixins.forEach( mixin => {\n\t\tObject.getOwnPropertyNames( mixin ).concat( Object.getOwnPropertySymbols( mixin ) )\n\t\t\t.forEach( key => {\n\t\t\t\tif ( key in baseClass.prototype ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst sourceDescriptor = Object.getOwnPropertyDescriptor( mixin, key );\n\t\t\t\tsourceDescriptor.enumerable = false;\n\n\t\t\t\tObject.defineProperty( baseClass.prototype, key, sourceDescriptor );\n\t\t\t} );\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/comparearrays\n */\n\n/**\n * Compares how given arrays relate to each other. One array can be: same as another array, prefix of another array\n * or completely different. If arrays are different, first index at which they differ is returned. Otherwise,\n * a flag specifying the relation is returned. Flags are negative numbers, so whenever a number >= 0 is returned\n * it means that arrays differ.\n *\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 2 ] );\t\t// 'same'\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 2, 1 ] );\t\t// 'prefix'\n *\t\tcompareArrays( [ 0, 2 ], [ 0 ] );\t\t\t// 'extension'\n *\t\tcompareArrays( [ 0, 2 ], [ 1, 2 ] );\t\t// 0\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 1 ] );\t\t// 1\n *\n * @param {Array} a Array that is compared.\n * @param {Array} b Array to compare with.\n * @returns {module:utils/comparearrays~ArrayRelation} How array `a` is related to `b`.\n */\nexport default function compareArrays( a, b ) {\n\tconst minLen = Math.min( a.length, b.length );\n\n\tfor ( let i = 0; i < minLen; i++ ) {\n\t\tif ( a[ i ] != b[ i ] ) {\n\t\t\t// The arrays are different.\n\t\t\treturn i;\n\t\t}\n\t}\n\n\t// Both arrays were same at all points.\n\tif ( a.length == b.length ) {\n\t\t// If their length is also same, they are the same.\n\t\treturn 'same';\n\t} else if ( a.length < b.length ) {\n\t\t// Compared array is shorter so it is a prefix of the other array.\n\t\treturn 'prefix';\n\t} else {\n\t\t// Compared array is longer so it is an extension of the other array.\n\t\treturn 'extension';\n\t}\n}\n\n/**\n * @typedef {'extension'|'same'|'prefix'} module:utils/comparearrays~ArrayRelation\n */\n","/**\n * Removes all key-value entries from the list cache.\n *\n * @private\n * @name clear\n * @memberOf ListCache\n */\nfunction listCacheClear() {\n this.__data__ = [];\n this.size = 0;\n}\n\nexport default listCacheClear;\n","/**\n * Performs a\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * comparison between two values to determine if they are equivalent.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.eq(object, object);\n * // => true\n *\n * _.eq(object, other);\n * // => false\n *\n * _.eq('a', 'a');\n * // => true\n *\n * _.eq('a', Object('a'));\n * // => false\n *\n * _.eq(NaN, NaN);\n * // => true\n */\nfunction eq(value, other) {\n return value === other || (value !== value && other !== other);\n}\n\nexport default eq;\n","import eq from './eq.js';\n\n/**\n * Gets the index at which the `key` is found in `array` of key-value pairs.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} key The key to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction assocIndexOf(array, key) {\n var length = array.length;\n while (length--) {\n if (eq(array[length][0], key)) {\n return length;\n }\n }\n return -1;\n}\n\nexport default assocIndexOf;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/** Built-in value references. */\nvar splice = arrayProto.splice;\n\n/**\n * Removes `key` and its value from the list cache.\n *\n * @private\n * @name delete\n * @memberOf ListCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction listCacheDelete(key) {\n var data = this.__data__,\n index = assocIndexOf(data, key);\n\n if (index < 0) {\n return false;\n }\n var lastIndex = data.length - 1;\n if (index == lastIndex) {\n data.pop();\n } else {\n splice.call(data, index, 1);\n }\n --this.size;\n return true;\n}\n\nexport default listCacheDelete;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Gets the list cache value for `key`.\n *\n * @private\n * @name get\n * @memberOf ListCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction listCacheGet(key) {\n var data = this.__data__,\n index = assocIndexOf(data, key);\n\n return index < 0 ? undefined : data[index][1];\n}\n\nexport default listCacheGet;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Checks if a list cache value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf ListCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction listCacheHas(key) {\n return assocIndexOf(this.__data__, key) > -1;\n}\n\nexport default listCacheHas;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Sets the list cache `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf ListCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the list cache instance.\n */\nfunction listCacheSet(key, value) {\n var data = this.__data__,\n index = assocIndexOf(data, key);\n\n if (index < 0) {\n ++this.size;\n data.push([key, value]);\n } else {\n data[index][1] = value;\n }\n return this;\n}\n\nexport default listCacheSet;\n","import listCacheClear from './_listCacheClear.js';\nimport listCacheDelete from './_listCacheDelete.js';\nimport listCacheGet from './_listCacheGet.js';\nimport listCacheHas from './_listCacheHas.js';\nimport listCacheSet from './_listCacheSet.js';\n\n/**\n * Creates an list cache object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction ListCache(entries) {\n var index = -1,\n length = entries == null ? 0 : entries.length;\n\n this.clear();\n while (++index < length) {\n var entry = entries[index];\n this.set(entry[0], entry[1]);\n }\n}\n\n// Add methods to `ListCache`.\nListCache.prototype.clear = listCacheClear;\nListCache.prototype['delete'] = listCacheDelete;\nListCache.prototype.get = listCacheGet;\nListCache.prototype.has = listCacheHas;\nListCache.prototype.set = listCacheSet;\n\nexport default ListCache;\n","import ListCache from './_ListCache.js';\n\n/**\n * Removes all key-value entries from the stack.\n *\n * @private\n * @name clear\n * @memberOf Stack\n */\nfunction stackClear() {\n this.__data__ = new ListCache;\n this.size = 0;\n}\n\nexport default stackClear;\n","/**\n * Removes `key` and its value from the stack.\n *\n * @private\n * @name delete\n * @memberOf Stack\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction stackDelete(key) {\n var data = this.__data__,\n result = data['delete'](key);\n\n this.size = data.size;\n return result;\n}\n\nexport default stackDelete;\n","/**\n * Gets the stack value for `key`.\n *\n * @private\n * @name get\n * @memberOf Stack\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction stackGet(key) {\n return this.__data__.get(key);\n}\n\nexport default stackGet;\n","/**\n * Checks if a stack value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Stack\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction stackHas(key) {\n return this.__data__.has(key);\n}\n\nexport default stackHas;\n","/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n var type = typeof value;\n return value != null && (type == 'object' || type == 'function');\n}\n\nexport default isObject;\n","import baseGetTag from './_baseGetTag.js';\nimport isObject from './isObject.js';\n\n/** `Object#toString` result references. */\nvar asyncTag = '[object AsyncFunction]',\n funcTag = '[object Function]',\n genTag = '[object GeneratorFunction]',\n proxyTag = '[object Proxy]';\n\n/**\n * Checks if `value` is classified as a `Function` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a function, else `false`.\n * @example\n *\n * _.isFunction(_);\n * // => true\n *\n * _.isFunction(/abc/);\n * // => false\n */\nfunction isFunction(value) {\n if (!isObject(value)) {\n return false;\n }\n // The use of `Object#toString` avoids issues with the `typeof` operator\n // in Safari 9 which returns 'object' for typed arrays and other constructors.\n var tag = baseGetTag(value);\n return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;\n}\n\nexport default isFunction;\n","import root from './_root.js';\n\n/** Used to detect overreaching core-js shims. */\nvar coreJsData = root['__core-js_shared__'];\n\nexport default coreJsData;\n","import coreJsData from './_coreJsData.js';\n\n/** Used to detect methods masquerading as native. */\nvar maskSrcKey = (function() {\n var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');\n return uid ? ('Symbol(src)_1.' + uid) : '';\n}());\n\n/**\n * Checks if `func` has its source masked.\n *\n * @private\n * @param {Function} func The function to check.\n * @returns {boolean} Returns `true` if `func` is masked, else `false`.\n */\nfunction isMasked(func) {\n return !!maskSrcKey && (maskSrcKey in func);\n}\n\nexport default isMasked;\n","/** Used for built-in method references. */\nvar funcProto = Function.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/**\n * Converts `func` to its source code.\n *\n * @private\n * @param {Function} func The function to convert.\n * @returns {string} Returns the source code.\n */\nfunction toSource(func) {\n if (func != null) {\n try {\n return funcToString.call(func);\n } catch (e) {}\n try {\n return (func + '');\n } catch (e) {}\n }\n return '';\n}\n\nexport default toSource;\n","import isFunction from './isFunction.js';\nimport isMasked from './_isMasked.js';\nimport isObject from './isObject.js';\nimport toSource from './_toSource.js';\n\n/**\n * Used to match `RegExp`\n * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).\n */\nvar reRegExpChar = /[\\\\^$.*+?()[\\]{}|]/g;\n\n/** Used to detect host constructors (Safari). */\nvar reIsHostCtor = /^\\[object .+?Constructor\\]$/;\n\n/** Used for built-in method references. */\nvar funcProto = Function.prototype,\n objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to detect if a method is native. */\nvar reIsNative = RegExp('^' +\n funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\\\$&')\n .replace(/hasOwnProperty|(function).*?(?=\\\\\\()| for .+?(?=\\\\\\])/g, '$1.*?') + '$'\n);\n\n/**\n * The base implementation of `_.isNative` without bad shim checks.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n * else `false`.\n */\nfunction baseIsNative(value) {\n if (!isObject(value) || isMasked(value)) {\n return false;\n }\n var pattern = isFunction(value) ? reIsNative : reIsHostCtor;\n return pattern.test(toSource(value));\n}\n\nexport default baseIsNative;\n","/**\n * Gets the value at `key` of `object`.\n *\n * @private\n * @param {Object} [object] The object to query.\n * @param {string} key The key of the property to get.\n * @returns {*} Returns the property value.\n */\nfunction getValue(object, key) {\n return object == null ? undefined : object[key];\n}\n\nexport default getValue;\n","import baseIsNative from './_baseIsNative.js';\nimport getValue from './_getValue.js';\n\n/**\n * Gets the native function at `key` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the method to get.\n * @returns {*} Returns the function if it's native, else `undefined`.\n */\nfunction getNative(object, key) {\n var value = getValue(object, key);\n return baseIsNative(value) ? value : undefined;\n}\n\nexport default getNative;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Map = getNative(root, 'Map');\n\nexport default Map;\n","import getNative from './_getNative.js';\n\n/* Built-in method references that are verified to be native. */\nvar nativeCreate = getNative(Object, 'create');\n\nexport default nativeCreate;\n","import nativeCreate from './_nativeCreate.js';\n\n/**\n * Removes all key-value entries from the hash.\n *\n * @private\n * @name clear\n * @memberOf Hash\n */\nfunction hashClear() {\n this.__data__ = nativeCreate ? nativeCreate(null) : {};\n this.size = 0;\n}\n\nexport default hashClear;\n","/**\n * Removes `key` and its value from the hash.\n *\n * @private\n * @name delete\n * @memberOf Hash\n * @param {Object} hash The hash to modify.\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction hashDelete(key) {\n var result = this.has(key) && delete this.__data__[key];\n this.size -= result ? 1 : 0;\n return result;\n}\n\nexport default hashDelete;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Gets the hash value for `key`.\n *\n * @private\n * @name get\n * @memberOf Hash\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction hashGet(key) {\n var data = this.__data__;\n if (nativeCreate) {\n var result = data[key];\n return result === HASH_UNDEFINED ? undefined : result;\n }\n return hasOwnProperty.call(data, key) ? data[key] : undefined;\n}\n\nexport default hashGet;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Checks if a hash value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Hash\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction hashHas(key) {\n var data = this.__data__;\n return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);\n}\n\nexport default hashHas;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Sets the hash `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Hash\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the hash instance.\n */\nfunction hashSet(key, value) {\n var data = this.__data__;\n this.size += this.has(key) ? 0 : 1;\n data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;\n return this;\n}\n\nexport default hashSet;\n","import hashClear from './_hashClear.js';\nimport hashDelete from './_hashDelete.js';\nimport hashGet from './_hashGet.js';\nimport hashHas from './_hashHas.js';\nimport hashSet from './_hashSet.js';\n\n/**\n * Creates a hash object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Hash(entries) {\n var index = -1,\n length = entries == null ? 0 : entries.length;\n\n this.clear();\n while (++index < length) {\n var entry = entries[index];\n this.set(entry[0], entry[1]);\n }\n}\n\n// Add methods to `Hash`.\nHash.prototype.clear = hashClear;\nHash.prototype['delete'] = hashDelete;\nHash.prototype.get = hashGet;\nHash.prototype.has = hashHas;\nHash.prototype.set = hashSet;\n\nexport default Hash;\n","import Hash from './_Hash.js';\nimport ListCache from './_ListCache.js';\nimport Map from './_Map.js';\n\n/**\n * Removes all key-value entries from the map.\n *\n * @private\n * @name clear\n * @memberOf MapCache\n */\nfunction mapCacheClear() {\n this.size = 0;\n this.__data__ = {\n 'hash': new Hash,\n 'map': new (Map || ListCache),\n 'string': new Hash\n };\n}\n\nexport default mapCacheClear;\n","/**\n * Checks if `value` is suitable for use as unique object key.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is suitable, else `false`.\n */\nfunction isKeyable(value) {\n var type = typeof value;\n return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')\n ? (value !== '__proto__')\n : (value === null);\n}\n\nexport default isKeyable;\n","import isKeyable from './_isKeyable.js';\n\n/**\n * Gets the data for `map`.\n *\n * @private\n * @param {Object} map The map to query.\n * @param {string} key The reference key.\n * @returns {*} Returns the map data.\n */\nfunction getMapData(map, key) {\n var data = map.__data__;\n return isKeyable(key)\n ? data[typeof key == 'string' ? 'string' : 'hash']\n : data.map;\n}\n\nexport default getMapData;\n","import getMapData from './_getMapData.js';\n\n/**\n * Removes `key` and its value from the map.\n *\n * @private\n * @name delete\n * @memberOf MapCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction mapCacheDelete(key) {\n var result = getMapData(this, key)['delete'](key);\n this.size -= result ? 1 : 0;\n return result;\n}\n\nexport default mapCacheDelete;\n","import getMapData from './_getMapData.js';\n\n/**\n * Gets the map value for `key`.\n *\n * @private\n * @name get\n * @memberOf MapCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction mapCacheGet(key) {\n return getMapData(this, key).get(key);\n}\n\nexport default mapCacheGet;\n","import getMapData from './_getMapData.js';\n\n/**\n * Checks if a map value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf MapCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction mapCacheHas(key) {\n return getMapData(this, key).has(key);\n}\n\nexport default mapCacheHas;\n","import getMapData from './_getMapData.js';\n\n/**\n * Sets the map `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf MapCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the map cache instance.\n */\nfunction mapCacheSet(key, value) {\n var data = getMapData(this, key),\n size = data.size;\n\n data.set(key, value);\n this.size += data.size == size ? 0 : 1;\n return this;\n}\n\nexport default mapCacheSet;\n","import mapCacheClear from './_mapCacheClear.js';\nimport mapCacheDelete from './_mapCacheDelete.js';\nimport mapCacheGet from './_mapCacheGet.js';\nimport mapCacheHas from './_mapCacheHas.js';\nimport mapCacheSet from './_mapCacheSet.js';\n\n/**\n * Creates a map cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction MapCache(entries) {\n var index = -1,\n length = entries == null ? 0 : entries.length;\n\n this.clear();\n while (++index < length) {\n var entry = entries[index];\n this.set(entry[0], entry[1]);\n }\n}\n\n// Add methods to `MapCache`.\nMapCache.prototype.clear = mapCacheClear;\nMapCache.prototype['delete'] = mapCacheDelete;\nMapCache.prototype.get = mapCacheGet;\nMapCache.prototype.has = mapCacheHas;\nMapCache.prototype.set = mapCacheSet;\n\nexport default MapCache;\n","import ListCache from './_ListCache.js';\nimport Map from './_Map.js';\nimport MapCache from './_MapCache.js';\n\n/** Used as the size to enable large array optimizations. */\nvar LARGE_ARRAY_SIZE = 200;\n\n/**\n * Sets the stack `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Stack\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the stack cache instance.\n */\nfunction stackSet(key, value) {\n var data = this.__data__;\n if (data instanceof ListCache) {\n var pairs = data.__data__;\n if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {\n pairs.push([key, value]);\n this.size = ++data.size;\n return this;\n }\n data = this.__data__ = new MapCache(pairs);\n }\n data.set(key, value);\n this.size = data.size;\n return this;\n}\n\nexport default stackSet;\n","import ListCache from './_ListCache.js';\nimport stackClear from './_stackClear.js';\nimport stackDelete from './_stackDelete.js';\nimport stackGet from './_stackGet.js';\nimport stackHas from './_stackHas.js';\nimport stackSet from './_stackSet.js';\n\n/**\n * Creates a stack cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Stack(entries) {\n var data = this.__data__ = new ListCache(entries);\n this.size = data.size;\n}\n\n// Add methods to `Stack`.\nStack.prototype.clear = stackClear;\nStack.prototype['delete'] = stackDelete;\nStack.prototype.get = stackGet;\nStack.prototype.has = stackHas;\nStack.prototype.set = stackSet;\n\nexport default Stack;\n","/**\n * A specialized version of `_.forEach` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns `array`.\n */\nfunction arrayEach(array, iteratee) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (iteratee(array[index], index, array) === false) {\n break;\n }\n }\n return array;\n}\n\nexport default arrayEach;\n","import getNative from './_getNative.js';\n\nvar defineProperty = (function() {\n try {\n var func = getNative(Object, 'defineProperty');\n func({}, '', {});\n return func;\n } catch (e) {}\n}());\n\nexport default defineProperty;\n","import defineProperty from './_defineProperty.js';\n\n/**\n * The base implementation of `assignValue` and `assignMergeValue` without\n * value checks.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\nfunction baseAssignValue(object, key, value) {\n if (key == '__proto__' && defineProperty) {\n defineProperty(object, key, {\n 'configurable': true,\n 'enumerable': true,\n 'value': value,\n 'writable': true\n });\n } else {\n object[key] = value;\n }\n}\n\nexport default baseAssignValue;\n","import baseAssignValue from './_baseAssignValue.js';\nimport eq from './eq.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Assigns `value` to `key` of `object` if the existing value is not equivalent\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\nfunction assignValue(object, key, value) {\n var objValue = object[key];\n if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||\n (value === undefined && !(key in object))) {\n baseAssignValue(object, key, value);\n }\n}\n\nexport default assignValue;\n","import assignValue from './_assignValue.js';\nimport baseAssignValue from './_baseAssignValue.js';\n\n/**\n * Copies properties of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy properties from.\n * @param {Array} props The property identifiers to copy.\n * @param {Object} [object={}] The object to copy properties to.\n * @param {Function} [customizer] The function to customize copied values.\n * @returns {Object} Returns `object`.\n */\nfunction copyObject(source, props, object, customizer) {\n var isNew = !object;\n object || (object = {});\n\n var index = -1,\n length = props.length;\n\n while (++index < length) {\n var key = props[index];\n\n var newValue = customizer\n ? customizer(object[key], source[key], key, object, source)\n : undefined;\n\n if (newValue === undefined) {\n newValue = source[key];\n }\n if (isNew) {\n baseAssignValue(object, key, newValue);\n } else {\n assignValue(object, key, newValue);\n }\n }\n return object;\n}\n\nexport default copyObject;\n","/**\n * The base implementation of `_.times` without support for iteratee shorthands\n * or max array length checks.\n *\n * @private\n * @param {number} n The number of times to invoke `iteratee`.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the array of results.\n */\nfunction baseTimes(n, iteratee) {\n var index = -1,\n result = Array(n);\n\n while (++index < n) {\n result[index] = iteratee(index);\n }\n return result;\n}\n\nexport default baseTimes;\n","import baseGetTag from './_baseGetTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]';\n\n/**\n * The base implementation of `_.isArguments`.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n */\nfunction baseIsArguments(value) {\n return isObjectLike(value) && baseGetTag(value) == argsTag;\n}\n\nexport default baseIsArguments;\n","import baseIsArguments from './_baseIsArguments.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/**\n * Checks if `value` is likely an `arguments` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n * else `false`.\n * @example\n *\n * _.isArguments(function() { return arguments; }());\n * // => true\n *\n * _.isArguments([1, 2, 3]);\n * // => false\n */\nvar isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {\n return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&\n !propertyIsEnumerable.call(value, 'callee');\n};\n\nexport default isArguments;\n","/**\n * Checks if `value` is classified as an `Array` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array, else `false`.\n * @example\n *\n * _.isArray([1, 2, 3]);\n * // => true\n *\n * _.isArray(document.body.children);\n * // => false\n *\n * _.isArray('abc');\n * // => false\n *\n * _.isArray(_.noop);\n * // => false\n */\nvar isArray = Array.isArray;\n\nexport default isArray;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/** Used to detect unsigned integer values. */\nvar reIsUint = /^(?:0|[1-9]\\d*)$/;\n\n/**\n * Checks if `value` is a valid array-like index.\n *\n * @private\n * @param {*} value The value to check.\n * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.\n * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.\n */\nfunction isIndex(value, length) {\n var type = typeof value;\n length = length == null ? MAX_SAFE_INTEGER : length;\n\n return !!length &&\n (type == 'number' ||\n (type != 'symbol' && reIsUint.test(value))) &&\n (value > -1 && value % 1 == 0 && value < length);\n}\n\nexport default isIndex;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/**\n * Checks if `value` is a valid array-like length.\n *\n * **Note:** This method is loosely based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.\n * @example\n *\n * _.isLength(3);\n * // => true\n *\n * _.isLength(Number.MIN_VALUE);\n * // => false\n *\n * _.isLength(Infinity);\n * // => false\n *\n * _.isLength('3');\n * // => false\n */\nfunction isLength(value) {\n return typeof value == 'number' &&\n value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;\n}\n\nexport default isLength;\n","import baseGetTag from './_baseGetTag.js';\nimport isLength from './isLength.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n arrayTag = '[object Array]',\n boolTag = '[object Boolean]',\n dateTag = '[object Date]',\n errorTag = '[object Error]',\n funcTag = '[object Function]',\n mapTag = '[object Map]',\n numberTag = '[object Number]',\n objectTag = '[object Object]',\n regexpTag = '[object RegExp]',\n setTag = '[object Set]',\n stringTag = '[object String]',\n weakMapTag = '[object WeakMap]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n dataViewTag = '[object DataView]',\n float32Tag = '[object Float32Array]',\n float64Tag = '[object Float64Array]',\n int8Tag = '[object Int8Array]',\n int16Tag = '[object Int16Array]',\n int32Tag = '[object Int32Array]',\n uint8Tag = '[object Uint8Array]',\n uint8ClampedTag = '[object Uint8ClampedArray]',\n uint16Tag = '[object Uint16Array]',\n uint32Tag = '[object Uint32Array]';\n\n/** Used to identify `toStringTag` values of typed arrays. */\nvar typedArrayTags = {};\ntypedArrayTags[float32Tag] = typedArrayTags[float64Tag] =\ntypedArrayTags[int8Tag] = typedArrayTags[int16Tag] =\ntypedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =\ntypedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =\ntypedArrayTags[uint32Tag] = true;\ntypedArrayTags[argsTag] = typedArrayTags[arrayTag] =\ntypedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =\ntypedArrayTags[dataViewTag] = typedArrayTags[dateTag] =\ntypedArrayTags[errorTag] = typedArrayTags[funcTag] =\ntypedArrayTags[mapTag] = typedArrayTags[numberTag] =\ntypedArrayTags[objectTag] = typedArrayTags[regexpTag] =\ntypedArrayTags[setTag] = typedArrayTags[stringTag] =\ntypedArrayTags[weakMapTag] = false;\n\n/**\n * The base implementation of `_.isTypedArray` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n */\nfunction baseIsTypedArray(value) {\n return isObjectLike(value) &&\n isLength(value.length) && !!typedArrayTags[baseGetTag(value)];\n}\n\nexport default baseIsTypedArray;\n","/**\n * The base implementation of `_.unary` without support for storing metadata.\n *\n * @private\n * @param {Function} func The function to cap arguments for.\n * @returns {Function} Returns the new capped function.\n */\nfunction baseUnary(func) {\n return function(value) {\n return func(value);\n };\n}\n\nexport default baseUnary;\n","import baseIsTypedArray from './_baseIsTypedArray.js';\nimport baseUnary from './_baseUnary.js';\nimport nodeUtil from './_nodeUtil.js';\n\n/* Node.js helper references. */\nvar nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;\n\n/**\n * Checks if `value` is classified as a typed array.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n * @example\n *\n * _.isTypedArray(new Uint8Array);\n * // => true\n *\n * _.isTypedArray([]);\n * // => false\n */\nvar isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;\n\nexport default isTypedArray;\n","import baseTimes from './_baseTimes.js';\nimport isArguments from './isArguments.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isIndex from './_isIndex.js';\nimport isTypedArray from './isTypedArray.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Creates an array of the enumerable property names of the array-like `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @param {boolean} inherited Specify returning inherited property names.\n * @returns {Array} Returns the array of property names.\n */\nfunction arrayLikeKeys(value, inherited) {\n var isArr = isArray(value),\n isArg = !isArr && isArguments(value),\n isBuff = !isArr && !isArg && isBuffer(value),\n isType = !isArr && !isArg && !isBuff && isTypedArray(value),\n skipIndexes = isArr || isArg || isBuff || isType,\n result = skipIndexes ? baseTimes(value.length, String) : [],\n length = result.length;\n\n for (var key in value) {\n if ((inherited || hasOwnProperty.call(value, key)) &&\n !(skipIndexes && (\n // Safari 9 has enumerable `arguments.length` in strict mode.\n key == 'length' ||\n // Node.js 0.10 has enumerable non-index properties on buffers.\n (isBuff && (key == 'offset' || key == 'parent')) ||\n // PhantomJS 2 has enumerable non-index properties on typed arrays.\n (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||\n // Skip index properties.\n isIndex(key, length)\n ))) {\n result.push(key);\n }\n }\n return result;\n}\n\nexport default arrayLikeKeys;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Checks if `value` is likely a prototype object.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.\n */\nfunction isPrototype(value) {\n var Ctor = value && value.constructor,\n proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;\n\n return value === proto;\n}\n\nexport default isPrototype;\n","import overArg from './_overArg.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeKeys = overArg(Object.keys, Object);\n\nexport default nativeKeys;\n","import isPrototype from './_isPrototype.js';\nimport nativeKeys from './_nativeKeys.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction baseKeys(object) {\n if (!isPrototype(object)) {\n return nativeKeys(object);\n }\n var result = [];\n for (var key in Object(object)) {\n if (hasOwnProperty.call(object, key) && key != 'constructor') {\n result.push(key);\n }\n }\n return result;\n}\n\nexport default baseKeys;\n","import isFunction from './isFunction.js';\nimport isLength from './isLength.js';\n\n/**\n * Checks if `value` is array-like. A value is considered array-like if it's\n * not a function and has a `value.length` that's an integer greater than or\n * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is array-like, else `false`.\n * @example\n *\n * _.isArrayLike([1, 2, 3]);\n * // => true\n *\n * _.isArrayLike(document.body.children);\n * // => true\n *\n * _.isArrayLike('abc');\n * // => true\n *\n * _.isArrayLike(_.noop);\n * // => false\n */\nfunction isArrayLike(value) {\n return value != null && isLength(value.length) && !isFunction(value);\n}\n\nexport default isArrayLike;\n","import arrayLikeKeys from './_arrayLikeKeys.js';\nimport baseKeys from './_baseKeys.js';\nimport isArrayLike from './isArrayLike.js';\n\n/**\n * Creates an array of the own enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects. See the\n * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * for more details.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keys(new Foo);\n * // => ['a', 'b'] (iteration order is not guaranteed)\n *\n * _.keys('hi');\n * // => ['0', '1']\n */\nfunction keys(object) {\n return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);\n}\n\nexport default keys;\n","import copyObject from './_copyObject.js';\nimport keys from './keys.js';\n\n/**\n * The base implementation of `_.assign` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\nfunction baseAssign(object, source) {\n return object && copyObject(source, keys(source), object);\n}\n\nexport default baseAssign;\n","/**\n * This function is like\n * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * except that it includes inherited enumerable properties.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction nativeKeysIn(object) {\n var result = [];\n if (object != null) {\n for (var key in Object(object)) {\n result.push(key);\n }\n }\n return result;\n}\n\nexport default nativeKeysIn;\n","import isObject from './isObject.js';\nimport isPrototype from './_isPrototype.js';\nimport nativeKeysIn from './_nativeKeysIn.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction baseKeysIn(object) {\n if (!isObject(object)) {\n return nativeKeysIn(object);\n }\n var isProto = isPrototype(object),\n result = [];\n\n for (var key in object) {\n if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {\n result.push(key);\n }\n }\n return result;\n}\n\nexport default baseKeysIn;\n","import arrayLikeKeys from './_arrayLikeKeys.js';\nimport baseKeysIn from './_baseKeysIn.js';\nimport isArrayLike from './isArrayLike.js';\n\n/**\n * Creates an array of the own and inherited enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keysIn(new Foo);\n * // => ['a', 'b', 'c'] (iteration order is not guaranteed)\n */\nfunction keysIn(object) {\n return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);\n}\n\nexport default keysIn;\n","import copyObject from './_copyObject.js';\nimport keysIn from './keysIn.js';\n\n/**\n * The base implementation of `_.assignIn` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\nfunction baseAssignIn(object, source) {\n return object && copyObject(source, keysIn(source), object);\n}\n\nexport default baseAssignIn;\n","/**\n * Copies the values of `source` to `array`.\n *\n * @private\n * @param {Array} source The array to copy values from.\n * @param {Array} [array=[]] The array to copy values to.\n * @returns {Array} Returns `array`.\n */\nfunction copyArray(source, array) {\n var index = -1,\n length = source.length;\n\n array || (array = Array(length));\n while (++index < length) {\n array[index] = source[index];\n }\n return array;\n}\n\nexport default copyArray;\n","/**\n * A specialized version of `_.filter` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n */\nfunction arrayFilter(array, predicate) {\n var index = -1,\n length = array == null ? 0 : array.length,\n resIndex = 0,\n result = [];\n\n while (++index < length) {\n var value = array[index];\n if (predicate(value, index, array)) {\n result[resIndex++] = value;\n }\n }\n return result;\n}\n\nexport default arrayFilter;\n","/**\n * This method returns a new empty array.\n *\n * @static\n * @memberOf _\n * @since 4.13.0\n * @category Util\n * @returns {Array} Returns the new empty array.\n * @example\n *\n * var arrays = _.times(2, _.stubArray);\n *\n * console.log(arrays);\n * // => [[], []]\n *\n * console.log(arrays[0] === arrays[1]);\n * // => false\n */\nfunction stubArray() {\n return [];\n}\n\nexport default stubArray;\n","import arrayFilter from './_arrayFilter.js';\nimport stubArray from './stubArray.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeGetSymbols = Object.getOwnPropertySymbols;\n\n/**\n * Creates an array of the own enumerable symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\nvar getSymbols = !nativeGetSymbols ? stubArray : function(object) {\n if (object == null) {\n return [];\n }\n object = Object(object);\n return arrayFilter(nativeGetSymbols(object), function(symbol) {\n return propertyIsEnumerable.call(object, symbol);\n });\n};\n\nexport default getSymbols;\n","import copyObject from './_copyObject.js';\nimport getSymbols from './_getSymbols.js';\n\n/**\n * Copies own symbols of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\nfunction copySymbols(source, object) {\n return copyObject(source, getSymbols(source), object);\n}\n\nexport default copySymbols;\n","/**\n * Appends the elements of `values` to `array`.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to append.\n * @returns {Array} Returns `array`.\n */\nfunction arrayPush(array, values) {\n var index = -1,\n length = values.length,\n offset = array.length;\n\n while (++index < length) {\n array[offset + index] = values[index];\n }\n return array;\n}\n\nexport default arrayPush;\n","import arrayPush from './_arrayPush.js';\nimport getPrototype from './_getPrototype.js';\nimport getSymbols from './_getSymbols.js';\nimport stubArray from './stubArray.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeGetSymbols = Object.getOwnPropertySymbols;\n\n/**\n * Creates an array of the own and inherited enumerable symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\nvar getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {\n var result = [];\n while (object) {\n arrayPush(result, getSymbols(object));\n object = getPrototype(object);\n }\n return result;\n};\n\nexport default getSymbolsIn;\n","import copyObject from './_copyObject.js';\nimport getSymbolsIn from './_getSymbolsIn.js';\n\n/**\n * Copies own and inherited symbols of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\nfunction copySymbolsIn(source, object) {\n return copyObject(source, getSymbolsIn(source), object);\n}\n\nexport default copySymbolsIn;\n","import arrayPush from './_arrayPush.js';\nimport isArray from './isArray.js';\n\n/**\n * The base implementation of `getAllKeys` and `getAllKeysIn` which uses\n * `keysFunc` and `symbolsFunc` to get the enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @param {Function} symbolsFunc The function to get the symbols of `object`.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction baseGetAllKeys(object, keysFunc, symbolsFunc) {\n var result = keysFunc(object);\n return isArray(object) ? result : arrayPush(result, symbolsFunc(object));\n}\n\nexport default baseGetAllKeys;\n","import baseGetAllKeys from './_baseGetAllKeys.js';\nimport getSymbols from './_getSymbols.js';\nimport keys from './keys.js';\n\n/**\n * Creates an array of own enumerable property names and symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction getAllKeys(object) {\n return baseGetAllKeys(object, keys, getSymbols);\n}\n\nexport default getAllKeys;\n","import baseGetAllKeys from './_baseGetAllKeys.js';\nimport getSymbolsIn from './_getSymbolsIn.js';\nimport keysIn from './keysIn.js';\n\n/**\n * Creates an array of own and inherited enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction getAllKeysIn(object) {\n return baseGetAllKeys(object, keysIn, getSymbolsIn);\n}\n\nexport default getAllKeysIn;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar DataView = getNative(root, 'DataView');\n\nexport default DataView;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Promise = getNative(root, 'Promise');\n\nexport default Promise;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Set = getNative(root, 'Set');\n\nexport default Set;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar WeakMap = getNative(root, 'WeakMap');\n\nexport default WeakMap;\n","import DataView from './_DataView.js';\nimport Map from './_Map.js';\nimport Promise from './_Promise.js';\nimport Set from './_Set.js';\nimport WeakMap from './_WeakMap.js';\nimport baseGetTag from './_baseGetTag.js';\nimport toSource from './_toSource.js';\n\n/** `Object#toString` result references. */\nvar mapTag = '[object Map]',\n objectTag = '[object Object]',\n promiseTag = '[object Promise]',\n setTag = '[object Set]',\n weakMapTag = '[object WeakMap]';\n\nvar dataViewTag = '[object DataView]';\n\n/** Used to detect maps, sets, and weakmaps. */\nvar dataViewCtorString = toSource(DataView),\n mapCtorString = toSource(Map),\n promiseCtorString = toSource(Promise),\n setCtorString = toSource(Set),\n weakMapCtorString = toSource(WeakMap);\n\n/**\n * Gets the `toStringTag` of `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\nvar getTag = baseGetTag;\n\n// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.\nif ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||\n (Map && getTag(new Map) != mapTag) ||\n (Promise && getTag(Promise.resolve()) != promiseTag) ||\n (Set && getTag(new Set) != setTag) ||\n (WeakMap && getTag(new WeakMap) != weakMapTag)) {\n getTag = function(value) {\n var result = baseGetTag(value),\n Ctor = result == objectTag ? value.constructor : undefined,\n ctorString = Ctor ? toSource(Ctor) : '';\n\n if (ctorString) {\n switch (ctorString) {\n case dataViewCtorString: return dataViewTag;\n case mapCtorString: return mapTag;\n case promiseCtorString: return promiseTag;\n case setCtorString: return setTag;\n case weakMapCtorString: return weakMapTag;\n }\n }\n return result;\n };\n}\n\nexport default getTag;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Initializes an array clone.\n *\n * @private\n * @param {Array} array The array to clone.\n * @returns {Array} Returns the initialized clone.\n */\nfunction initCloneArray(array) {\n var length = array.length,\n result = new array.constructor(length);\n\n // Add properties assigned by `RegExp#exec`.\n if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {\n result.index = array.index;\n result.input = array.input;\n }\n return result;\n}\n\nexport default initCloneArray;\n","import root from './_root.js';\n\n/** Built-in value references. */\nvar Uint8Array = root.Uint8Array;\n\nexport default Uint8Array;\n","import Uint8Array from './_Uint8Array.js';\n\n/**\n * Creates a clone of `arrayBuffer`.\n *\n * @private\n * @param {ArrayBuffer} arrayBuffer The array buffer to clone.\n * @returns {ArrayBuffer} Returns the cloned array buffer.\n */\nfunction cloneArrayBuffer(arrayBuffer) {\n var result = new arrayBuffer.constructor(arrayBuffer.byteLength);\n new Uint8Array(result).set(new Uint8Array(arrayBuffer));\n return result;\n}\n\nexport default cloneArrayBuffer;\n","import cloneArrayBuffer from './_cloneArrayBuffer.js';\n\n/**\n * Creates a clone of `dataView`.\n *\n * @private\n * @param {Object} dataView The data view to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned data view.\n */\nfunction cloneDataView(dataView, isDeep) {\n var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;\n return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);\n}\n\nexport default cloneDataView;\n","/** Used to match `RegExp` flags from their coerced string values. */\nvar reFlags = /\\w*$/;\n\n/**\n * Creates a clone of `regexp`.\n *\n * @private\n * @param {Object} regexp The regexp to clone.\n * @returns {Object} Returns the cloned regexp.\n */\nfunction cloneRegExp(regexp) {\n var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));\n result.lastIndex = regexp.lastIndex;\n return result;\n}\n\nexport default cloneRegExp;\n","import Symbol from './_Symbol.js';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * Creates a clone of the `symbol` object.\n *\n * @private\n * @param {Object} symbol The symbol object to clone.\n * @returns {Object} Returns the cloned symbol object.\n */\nfunction cloneSymbol(symbol) {\n return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};\n}\n\nexport default cloneSymbol;\n","import cloneArrayBuffer from './_cloneArrayBuffer.js';\n\n/**\n * Creates a clone of `typedArray`.\n *\n * @private\n * @param {Object} typedArray The typed array to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned typed array.\n */\nfunction cloneTypedArray(typedArray, isDeep) {\n var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;\n return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);\n}\n\nexport default cloneTypedArray;\n","import cloneArrayBuffer from './_cloneArrayBuffer.js';\nimport cloneDataView from './_cloneDataView.js';\nimport cloneRegExp from './_cloneRegExp.js';\nimport cloneSymbol from './_cloneSymbol.js';\nimport cloneTypedArray from './_cloneTypedArray.js';\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n dateTag = '[object Date]',\n mapTag = '[object Map]',\n numberTag = '[object Number]',\n regexpTag = '[object RegExp]',\n setTag = '[object Set]',\n stringTag = '[object String]',\n symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n dataViewTag = '[object DataView]',\n float32Tag = '[object Float32Array]',\n float64Tag = '[object Float64Array]',\n int8Tag = '[object Int8Array]',\n int16Tag = '[object Int16Array]',\n int32Tag = '[object Int32Array]',\n uint8Tag = '[object Uint8Array]',\n uint8ClampedTag = '[object Uint8ClampedArray]',\n uint16Tag = '[object Uint16Array]',\n uint32Tag = '[object Uint32Array]';\n\n/**\n * Initializes an object clone based on its `toStringTag`.\n *\n * **Note:** This function only supports cloning values with tags of\n * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.\n *\n * @private\n * @param {Object} object The object to clone.\n * @param {string} tag The `toStringTag` of the object to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the initialized clone.\n */\nfunction initCloneByTag(object, tag, isDeep) {\n var Ctor = object.constructor;\n switch (tag) {\n case arrayBufferTag:\n return cloneArrayBuffer(object);\n\n case boolTag:\n case dateTag:\n return new Ctor(+object);\n\n case dataViewTag:\n return cloneDataView(object, isDeep);\n\n case float32Tag: case float64Tag:\n case int8Tag: case int16Tag: case int32Tag:\n case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:\n return cloneTypedArray(object, isDeep);\n\n case mapTag:\n return new Ctor;\n\n case numberTag:\n case stringTag:\n return new Ctor(object);\n\n case regexpTag:\n return cloneRegExp(object);\n\n case setTag:\n return new Ctor;\n\n case symbolTag:\n return cloneSymbol(object);\n }\n}\n\nexport default initCloneByTag;\n","import isObject from './isObject.js';\n\n/** Built-in value references. */\nvar objectCreate = Object.create;\n\n/**\n * The base implementation of `_.create` without support for assigning\n * properties to the created object.\n *\n * @private\n * @param {Object} proto The object to inherit from.\n * @returns {Object} Returns the new object.\n */\nvar baseCreate = (function() {\n function object() {}\n return function(proto) {\n if (!isObject(proto)) {\n return {};\n }\n if (objectCreate) {\n return objectCreate(proto);\n }\n object.prototype = proto;\n var result = new object;\n object.prototype = undefined;\n return result;\n };\n}());\n\nexport default baseCreate;\n","import baseCreate from './_baseCreate.js';\nimport getPrototype from './_getPrototype.js';\nimport isPrototype from './_isPrototype.js';\n\n/**\n * Initializes an object clone.\n *\n * @private\n * @param {Object} object The object to clone.\n * @returns {Object} Returns the initialized clone.\n */\nfunction initCloneObject(object) {\n return (typeof object.constructor == 'function' && !isPrototype(object))\n ? baseCreate(getPrototype(object))\n : {};\n}\n\nexport default initCloneObject;\n","import getTag from './_getTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar mapTag = '[object Map]';\n\n/**\n * The base implementation of `_.isMap` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n */\nfunction baseIsMap(value) {\n return isObjectLike(value) && getTag(value) == mapTag;\n}\n\nexport default baseIsMap;\n","import baseIsMap from './_baseIsMap.js';\nimport baseUnary from './_baseUnary.js';\nimport nodeUtil from './_nodeUtil.js';\n\n/* Node.js helper references. */\nvar nodeIsMap = nodeUtil && nodeUtil.isMap;\n\n/**\n * Checks if `value` is classified as a `Map` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n * @example\n *\n * _.isMap(new Map);\n * // => true\n *\n * _.isMap(new WeakMap);\n * // => false\n */\nvar isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;\n\nexport default isMap;\n","import getTag from './_getTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar setTag = '[object Set]';\n\n/**\n * The base implementation of `_.isSet` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n */\nfunction baseIsSet(value) {\n return isObjectLike(value) && getTag(value) == setTag;\n}\n\nexport default baseIsSet;\n","import baseIsSet from './_baseIsSet.js';\nimport baseUnary from './_baseUnary.js';\nimport nodeUtil from './_nodeUtil.js';\n\n/* Node.js helper references. */\nvar nodeIsSet = nodeUtil && nodeUtil.isSet;\n\n/**\n * Checks if `value` is classified as a `Set` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n * @example\n *\n * _.isSet(new Set);\n * // => true\n *\n * _.isSet(new WeakSet);\n * // => false\n */\nvar isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;\n\nexport default isSet;\n","import Stack from './_Stack.js';\nimport arrayEach from './_arrayEach.js';\nimport assignValue from './_assignValue.js';\nimport baseAssign from './_baseAssign.js';\nimport baseAssignIn from './_baseAssignIn.js';\nimport cloneBuffer from './_cloneBuffer.js';\nimport copyArray from './_copyArray.js';\nimport copySymbols from './_copySymbols.js';\nimport copySymbolsIn from './_copySymbolsIn.js';\nimport getAllKeys from './_getAllKeys.js';\nimport getAllKeysIn from './_getAllKeysIn.js';\nimport getTag from './_getTag.js';\nimport initCloneArray from './_initCloneArray.js';\nimport initCloneByTag from './_initCloneByTag.js';\nimport initCloneObject from './_initCloneObject.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isMap from './isMap.js';\nimport isObject from './isObject.js';\nimport isSet from './isSet.js';\nimport keys from './keys.js';\n\n/** Used to compose bitmasks for cloning. */\nvar CLONE_DEEP_FLAG = 1,\n CLONE_FLAT_FLAG = 2,\n CLONE_SYMBOLS_FLAG = 4;\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n arrayTag = '[object Array]',\n boolTag = '[object Boolean]',\n dateTag = '[object Date]',\n errorTag = '[object Error]',\n funcTag = '[object Function]',\n genTag = '[object GeneratorFunction]',\n mapTag = '[object Map]',\n numberTag = '[object Number]',\n objectTag = '[object Object]',\n regexpTag = '[object RegExp]',\n setTag = '[object Set]',\n stringTag = '[object String]',\n symbolTag = '[object Symbol]',\n weakMapTag = '[object WeakMap]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n dataViewTag = '[object DataView]',\n float32Tag = '[object Float32Array]',\n float64Tag = '[object Float64Array]',\n int8Tag = '[object Int8Array]',\n int16Tag = '[object Int16Array]',\n int32Tag = '[object Int32Array]',\n uint8Tag = '[object Uint8Array]',\n uint8ClampedTag = '[object Uint8ClampedArray]',\n uint16Tag = '[object Uint16Array]',\n uint32Tag = '[object Uint32Array]';\n\n/** Used to identify `toStringTag` values supported by `_.clone`. */\nvar cloneableTags = {};\ncloneableTags[argsTag] = cloneableTags[arrayTag] =\ncloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =\ncloneableTags[boolTag] = cloneableTags[dateTag] =\ncloneableTags[float32Tag] = cloneableTags[float64Tag] =\ncloneableTags[int8Tag] = cloneableTags[int16Tag] =\ncloneableTags[int32Tag] = cloneableTags[mapTag] =\ncloneableTags[numberTag] = cloneableTags[objectTag] =\ncloneableTags[regexpTag] = cloneableTags[setTag] =\ncloneableTags[stringTag] = cloneableTags[symbolTag] =\ncloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =\ncloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;\ncloneableTags[errorTag] = cloneableTags[funcTag] =\ncloneableTags[weakMapTag] = false;\n\n/**\n * The base implementation of `_.clone` and `_.cloneDeep` which tracks\n * traversed objects.\n *\n * @private\n * @param {*} value The value to clone.\n * @param {boolean} bitmask The bitmask flags.\n * 1 - Deep clone\n * 2 - Flatten inherited properties\n * 4 - Clone symbols\n * @param {Function} [customizer] The function to customize cloning.\n * @param {string} [key] The key of `value`.\n * @param {Object} [object] The parent object of `value`.\n * @param {Object} [stack] Tracks traversed objects and their clone counterparts.\n * @returns {*} Returns the cloned value.\n */\nfunction baseClone(value, bitmask, customizer, key, object, stack) {\n var result,\n isDeep = bitmask & CLONE_DEEP_FLAG,\n isFlat = bitmask & CLONE_FLAT_FLAG,\n isFull = bitmask & CLONE_SYMBOLS_FLAG;\n\n if (customizer) {\n result = object ? customizer(value, key, object, stack) : customizer(value);\n }\n if (result !== undefined) {\n return result;\n }\n if (!isObject(value)) {\n return value;\n }\n var isArr = isArray(value);\n if (isArr) {\n result = initCloneArray(value);\n if (!isDeep) {\n return copyArray(value, result);\n }\n } else {\n var tag = getTag(value),\n isFunc = tag == funcTag || tag == genTag;\n\n if (isBuffer(value)) {\n return cloneBuffer(value, isDeep);\n }\n if (tag == objectTag || tag == argsTag || (isFunc && !object)) {\n result = (isFlat || isFunc) ? {} : initCloneObject(value);\n if (!isDeep) {\n return isFlat\n ? copySymbolsIn(value, baseAssignIn(result, value))\n : copySymbols(value, baseAssign(result, value));\n }\n } else {\n if (!cloneableTags[tag]) {\n return object ? value : {};\n }\n result = initCloneByTag(value, tag, isDeep);\n }\n }\n // Check for circular references and return its corresponding clone.\n stack || (stack = new Stack);\n var stacked = stack.get(value);\n if (stacked) {\n return stacked;\n }\n stack.set(value, result);\n\n if (isSet(value)) {\n value.forEach(function(subValue) {\n result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));\n });\n\n return result;\n }\n\n if (isMap(value)) {\n value.forEach(function(subValue, key) {\n result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));\n });\n\n return result;\n }\n\n var keysFunc = isFull\n ? (isFlat ? getAllKeysIn : getAllKeys)\n : (isFlat ? keysIn : keys);\n\n var props = isArr ? undefined : keysFunc(value);\n arrayEach(props || value, function(subValue, key) {\n if (props) {\n key = subValue;\n subValue = value[key];\n }\n // Recursively populate clone (susceptible to call stack limits).\n assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));\n });\n return result;\n}\n\nexport default baseClone;\n","import baseClone from './_baseClone.js';\n\n/** Used to compose bitmasks for cloning. */\nvar CLONE_SYMBOLS_FLAG = 4;\n\n/**\n * Creates a shallow clone of `value`.\n *\n * **Note:** This method is loosely based on the\n * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)\n * and supports cloning arrays, array buffers, booleans, date objects, maps,\n * numbers, `Object` objects, regexes, sets, strings, symbols, and typed\n * arrays. The own enumerable properties of `arguments` objects are cloned\n * as plain objects. An empty object is returned for uncloneable values such\n * as error objects, functions, DOM nodes, and WeakMaps.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to clone.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeep\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var shallow = _.clone(objects);\n * console.log(shallow[0] === objects[0]);\n * // => true\n */\nfunction clone(value) {\n return baseClone(value, CLONE_SYMBOLS_FLAG);\n}\n\nexport default clone;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/node\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport { clone } from 'lodash-es';\n\n/**\n * Abstract tree view node class.\n *\n * This is an abstract class. Its constructor should not be used directly.\n * Use the {@link module:engine/view/element~Element} class to create view elements\n * or {@link module:engine/view/text~Text} class to create view text nodes.\n *\n * @abstract\n */\nexport default class Node {\n\t/**\n\t * Creates a tree view node.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Parent element. Null by default. Set by {@link module:engine/view/element~Element#_insertChild}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t\t */\n\t\tthis.parent = null;\n\t}\n\n\t/**\n\t * Index of the node in the parent element or null if the node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that view tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget index() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// No parent or child doesn't exist in parent's children.\n\t\tif ( ( pos = this.parent.getChildIndex( this ) ) == -1 ) {\n\t\t\t/**\n\t\t\t * The node's parent does not contain this node. It means that the document tree is corrupted.\n\t\t\t *\n\t\t\t * @error view-node-not-found-in-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-node-not-found-in-parent: The node\\'s parent does not contain this node.' );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Node's next sibling, or `null` if it is the last child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nextSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index + 1 ) ) || null;\n\t}\n\n\t/**\n\t * Node's previous sibling, or `null` if it is the first child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget previousSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index - 1 ) ) || null;\n\t}\n\n\t/**\n\t * Top-most ancestor of the node. If the node has no parent it is the root itself.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\tlet root = this; // eslint-disable-line consistent-this\n\n\t\twhile ( root.parent ) {\n\t\t\troot = root.parent;\n\t\t}\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this node, or `null` if the node is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\t// Parent might be Node, null or DocumentFragment.\n\t\tif ( this.parent instanceof Node ) {\n\t\t\treturn this.parent.document;\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Gets a path to the node. The path is an array containing indices of consecutive ancestors of this node,\n\t * beginning from {@link module:engine/view/node~Node#root root}, down to this node's index.\n\t *\n\t *\t\tconst abc = downcastWriter.createText( 'abc' );\n\t *\t\tconst foo = downcastWriter.createText( 'foo' );\n\t *\t\tconst h1 = downcastWriter.createElement( 'h1', null, downcastWriter.createText( 'header' ) );\n\t *\t\tconst p = downcastWriter.createElement( 'p', null, [ abc, foo ] );\n\t *\t\tconst div = downcastWriter.createElement( 'div', null, [ h1, p ] );\n\t *\t\tfoo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.\n\t *\t\th1.getPath(); // Returns [ 0 ].\n\t *\t\tdiv.getPath(); // Returns [].\n\t *\n\t * @returns {Array.} The path.\n\t */\n\tgetPath() {\n\t\tconst path = [];\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\twhile ( node.parent ) {\n\t\t\tpath.unshift( node.index );\n\t\t\tnode = node.parent;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this node.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from node's parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/element~Element} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both nodes.\n\t *\n\t * @param {module:engine/view/node~Node} node The second node.\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` both nodes will be considered \"ancestors\" too.\n\t * Which means that if e.g. node A is inside B, then their common ancestor will be B.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( node, options = {} ) {\n\t\tconst ancestorsA = this.getAncestors( options );\n\t\tconst ancestorsB = node.getAncestors( options );\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns whether this node is before given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisBefore( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisPath = this.getPath();\n\t\tconst nodePath = node.getPath();\n\n\t\tconst result = compareArrays( thisPath, nodePath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn true;\n\n\t\t\tcase 'extension':\n\t\t\t\treturn false;\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < nodePath[ result ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns whether this node is after given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisAfter( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// In other cases, just check if the `node` is before, and return the opposite.\n\t\treturn !this.isBefore( node );\n\t}\n\n\t/**\n\t * Removes node from parent.\n\t *\n\t * @protected\n\t */\n\t_remove() {\n\t\tthis.parent._removeChildren( this.index );\n\t}\n\n\t/**\n\t * @protected\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\n\t\tif ( this.parent ) {\n\t\t\tthis.parent._fireChange( type, node );\n\t\t}\n\t}\n\n\t/**\n\t * Custom toJSON method to solve child-parent circular dependencies.\n\t *\n\t * @returns {Object} Clone of this object with the parent property removed.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\t// Due to circular references we need to remove parent reference.\n\t\tdelete json.parent;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * This method is useful when processing view tree objects that are of unknown type. For example, a function\n\t * may return {@link module:engine/view/documentfragment~DocumentFragment} or {@link module:engine/view/node~Node}\n\t * that can be either text node or element. This method can be used to check what kind of object is returned.\n\t *\n\t *\t\tobj.is( 'node' ); // true for any node, false for document fragment and text fragment\n\t *\t\tobj.is( 'documentFragment' ); // true for document fragment, false for any node\n\t *\t\tobj.is( 'element' ); // true for any element, false for text node or document fragment\n\t *\t\tobj.is( 'element', 'p' ); // true only for element which name is 'p'\n\t *\t\tobj.is( 'p' ); // shortcut for obj.is( 'element', 'p' )\n\t *\t\tobj.is( 'text' ); // true for text node, false for element and document fragment\n\t *\n\t * @method #is\n\t * @param {'element'|'containerElement'|'attributeElement'|'emptyElement'|'uiElement'|\n\t * 'rootElement'|'documentFragment'|'text'|'textProxy'} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'node';\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @method #_clone\n\t * @returns {module:engine/view/node~Node} Clone of this node.\n\t */\n\n\t/**\n\t * Checks if provided node is similar to this node.\n\t *\n\t * @method #isSimilar\n\t * @returns {Boolean} True if nodes are similar.\n\t */\n}\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} children changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:children\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} attributes changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:attributes\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when {@link module:engine/view/text~Text text nodes} data changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:text\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * @event change\n */\n\nmix( Node, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/text\n */\n\nimport Node from './node';\n\n/**\n * Tree view text node.\n *\n * The constructor of this class shouldn't be used directly. To create new Text instances\n * use the {@link module:engine/view/downcastwriter~DowncastWriter#createText `DowncastWriter#createText()`}\n * method when working on data downcasted from the model or the\n * {@link module:engine/view/upcastwriter~UpcastWriter#createText `UpcastWriter#createText()`}\n * method when working on non-semantic views.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Text extends Node {\n\t/**\n\t * Creates a tree view text node.\n\t *\n\t * @protected\n\t * @param {String} data The text's data.\n\t */\n\tconstructor( data ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * The text content.\n\t\t *\n\t\t * Setting the data fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t\t *\n\t\t * @protected\n\t\t * @member {String} module:engine/view/text~Text#_textData\n\t\t */\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type ) {\n\t\treturn type == 'text' || super.is( type );\n\t}\n\n\t/**\n\t * The text content.\n\t *\n\t * @readonly\n\t * @type {String}\n\t */\n\tget data() {\n\t\treturn this._textData;\n\t}\n\n\t/**\n\t * This getter is required when using the addition assignment operator on protected property:\n\t *\n\t *\t\tconst foo = downcastWriter.createText( 'foo' );\n\t *\t\tconst bar = downcastWriter.createText( 'bar' );\n\t *\n\t *\t\tfoo._data += bar.data; // executes: `foo._data = foo._data + bar.data`\n\t *\t\tconsole.log( foo.data ); // prints: 'foobar'\n\t *\n\t * If the protected getter didn't exist, `foo._data` will return `undefined` and result of the merge will be invalid.\n\t *\n\t * @protected\n\t * @type {String}\n\t */\n\tget _data() {\n\t\treturn this.data;\n\t}\n\n\t/**\n\t * Sets data and fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t *\n\t * @protected\n\t * @fires change:text\n\t * @param {String} data New data for the text node.\n\t */\n\tset _data( data ) {\n\t\tthis._fireChange( 'text', this );\n\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * Checks if this text node is similar to other text node.\n\t * Both nodes should have the same data to be considered as similar.\n\t *\n\t * @param {module:engine/view/text~Text} otherNode Node to check if it is same as this node.\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherNode ) {\n\t\tif ( !( otherNode instanceof Text ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn this === otherNode || this.data === otherNode.data;\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @returns {module:engine/view/text~Text} Text node that is a clone of this node.\n\t */\n\t_clone() {\n\t\treturn new Text( this.data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/textproxy\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * TextProxy is a wrapper for substring of {@link module:engine/view/text~Text}. Instance of this class is created by\n * {@link module:engine/view/treewalker~TreeWalker} when only a part of {@link module:engine/view/text~Text} needs to be returned.\n *\n * `TextProxy` has an API similar to {@link module:engine/view/text~Text Text} and allows to do most of the common tasks performed\n * on view nodes.\n *\n * **Note:** Some `TextProxy` instances may represent whole text node, not just a part of it.\n * See {@link module:engine/view/textproxy~TextProxy#isPartial}.\n *\n * **Note:** `TextProxy` is a readonly interface.\n *\n * **Note:** `TextProxy` instances are created on the fly basing on the current state of parent {@link module:engine/view/text~Text}.\n * Because of this it is highly unrecommended to store references to `TextProxy instances because they might get\n * invalidated due to operations on Document. Also TextProxy is not a {@link module:engine/view/node~Node} so it can not be\n * inserted as a child of {@link module:engine/view/element~Element}.\n *\n * `TextProxy` instances are created by {@link module:engine/view/treewalker~TreeWalker view tree walker}. You should not need to create\n * an instance of this class by your own.\n */\nexport default class TextProxy {\n\t/**\n\t * Creates a text proxy.\n\t *\n\t * @protected\n\t * @param {module:engine/view/text~Text} textNode Text node which part is represented by this text proxy.\n\t * @param {Number} offsetInText Offset in {@link module:engine/view/textproxy~TextProxy#textNode text node}\n\t * from which the text proxy starts.\n\t * @param {Number} length Text proxy length, that is how many text node's characters, starting from `offsetInText` it represents.\n\t * @constructor\n\t */\n\tconstructor( textNode, offsetInText, length ) {\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/text~Text} element which TextProxy is a substring.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/text~Text} module:engine/view/textproxy~TextProxy#textNode\n\t\t */\n\t\tthis.textNode = textNode;\n\n\t\tif ( offsetInText < 0 || offsetInText > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given offsetInText value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-offsetintext\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-offsetintext: Given offsetInText value is incorrect.' );\n\t\t}\n\n\t\tif ( length < 0 || offsetInText + length > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given length value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-length: Given length value is incorrect.' );\n\t\t}\n\n\t\t/**\n\t\t * Text data represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:engine/view/textproxy~TextProxy#data\n\t\t */\n\t\tthis.data = textNode.data.substring( offsetInText, offsetInText + length );\n\n\t\t/**\n\t\t * Offset in the `textNode` where this `TextProxy` instance starts.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/textproxy~TextProxy#offsetInText\n\t\t */\n\t\tthis.offsetInText = offsetInText;\n\t}\n\n\t/**\n\t * Offset size of this node.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Flag indicating whether `TextProxy` instance covers only part of the original {@link module:engine/view/text~Text text node}\n\t * (`true`) or the whole text node (`false`).\n\t *\n\t * This is `false` when text proxy starts at the very beginning of {@link module:engine/view/textproxy~TextProxy#textNode textNode}\n\t * ({@link module:engine/view/textproxy~TextProxy#offsetInText offsetInText} equals `0`) and text proxy sizes is equal to\n\t * text node size.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isPartial() {\n\t\treturn this.data.length !== this.textNode.data.length;\n\t}\n\n\t/**\n\t * Parent of this text proxy, which is same as parent of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tget parent() {\n\t\treturn this.textNode.parent;\n\t}\n\n\t/**\n\t * Root of this text proxy, which is same as root of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.textNode.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this text proxy, or `null` if the text proxy is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this.textNode.document;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'textProxy';\n\t}\n\n\t/**\n\t * Returns ancestors array of this text proxy.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` {#textNode} will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from text proxy parent to\n\t * root element, otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this.textNode : this.parent;\n\n\t\twhile ( parent !== null ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/objecttomap\n */\n\n/**\n * Transforms object to map.\n *\n *\t\tconst map = objectToMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap.get( 'foo' ); // 1\n *\n * @param {Object} obj Object to transform.\n * @returns {Map} Map created from object.\n */\nexport default function objectToMap( obj ) {\n\tconst map = new Map();\n\n\tfor ( const key in obj ) {\n\t\tmap.set( key, obj[ key ] );\n\t}\n\n\treturn map;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/isiterable\n */\n\n/**\n * Checks if value implements iterator interface.\n *\n * @param {*} value The value to check.\n * @returns {Boolean} True if value implements iterator interface.\n */\nexport default function isIterable( value ) {\n\treturn !!( value && value[ Symbol.iterator ] );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/matcher\n */\n\n/**\n * View matcher class.\n * Instance of this class can be used to find {@link module:engine/view/element~Element elements} that match given pattern.\n */\nexport default class Matcher {\n\t/**\n\t * Creates new instance of Matcher.\n\t *\n\t * @param {String|RegExp|Object} [pattern] Match patterns. See {@link module:engine/view/matcher~Matcher#add add method} for\n\t * more information.\n\t */\n\tconstructor( ...pattern ) {\n\t\t/**\n\t\t * @private\n\t\t * @type {Array}\n\t\t */\n\t\tthis._patterns = [];\n\n\t\tthis.add( ...pattern );\n\t}\n\n\t/**\n\t * Adds pattern or patterns to matcher instance.\n\t *\n\t *\t\t// String.\n\t *\t\tmatcher.add( 'div' );\n\t *\n\t *\t\t// Regular expression.\n\t *\t\tmatcher.add( /^\\w/ );\n\t *\n\t *\t\t// Single class.\n\t *\t\tmatcher.add( {\n\t *\t\t\tclasses: 'foobar'\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/view/matcher~MatcherPattern} for more examples.\n\t *\n\t * Multiple patterns can be added in one call:\n\t *\n\t * \t\tmatcher.add( 'div', { classes: 'foobar' } );\n\t *\n\t * @param {Object|String|RegExp|Function} pattern Object describing pattern details. If string or regular expression\n\t * is provided it will be used to match element's name. Pattern can be also provided in a form\n\t * of a function - then this function will be called with each {@link module:engine/view/element~Element element} as a parameter.\n\t * Function's return value will be stored under `match` key of the object returned from\n\t * {@link module:engine/view/matcher~Matcher#match match} or {@link module:engine/view/matcher~Matcher#matchAll matchAll} methods.\n\t * @param {String|RegExp} [pattern.name] Name or regular expression to match element's name.\n\t * @param {Object} [pattern.attributes] Object with key-value pairs representing attributes to match. Each object key\n\t * represents attribute name. Value under that key can be either:\n\t * * `true` - then attribute is just required (can be empty),\n\t * * a string - then attribute has to be equal, or\n\t * * a regular expression - then attribute has to match the expression.\n\t * @param {String|RegExp|Array} [pattern.classes] Class name or array of class names to match. Each name can be\n\t * provided in a form of string or regular expression.\n\t * @param {Object} [pattern.styles] Object with key-value pairs representing styles to match. Each object key\n\t * represents style name. Value under that key can be either a string or a regular expression and it will be used\n\t * to match style value.\n\t */\n\tadd( ...pattern ) {\n\t\tfor ( let item of pattern ) {\n\t\t\t// String or RegExp pattern is used as element's name.\n\t\t\tif ( typeof item == 'string' || item instanceof RegExp ) {\n\t\t\t\titem = { name: item };\n\t\t\t}\n\n\t\t\t// Single class name/RegExp can be provided.\n\t\t\tif ( item.classes && ( typeof item.classes == 'string' || item.classes instanceof RegExp ) ) {\n\t\t\t\titem.classes = [ item.classes ];\n\t\t\t}\n\n\t\t\tthis._patterns.push( item );\n\t\t}\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns match information about first found\n\t * {@link module:engine/view/element~Element element}, otherwise returns `null`.\n\t *\n\t * Example of returned object:\n\t *\n\t *\t\t{\n\t *\t\t\telement: ,\n\t *\t\t\tpattern: ,\n\t *\t\t\tmatch: {\n\t *\t\t\t\tname: true,\n\t *\t\t\t\tattributes: [ 'title', 'href' ],\n\t *\t\t\t\tclasses: [ 'foo' ],\n\t *\t\t\t\tstyles: [ 'color', 'position' ]\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#matchAll\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Object|null} result\n\t * @returns {module:engine/view/element~Element} result.element Matched view element.\n\t * @returns {Object|String|RegExp|Function} result.pattern Pattern that was used to find matched element.\n\t * @returns {Object} result.match Object representing matched element parts.\n\t * @returns {Boolean} [result.match.name] True if name of the element was matched.\n\t * @returns {Array} [result.match.attributes] Array with matched attribute names.\n\t * @returns {Array} [result.match.classes] Array with matched class names.\n\t * @returns {Array} [result.match.styles] Array with matched style names.\n\t */\n\tmatch( ...element ) {\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\treturn {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns array of match information with all found\n\t * {@link module:engine/view/element~Element elements}. If no element is found - returns `null`.\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#match\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Array.|null} Array with match information about found elements or `null`. For more information\n\t * see {@link module:engine/view/matcher~Matcher#match match method} description.\n\t */\n\tmatchAll( ...element ) {\n\t\tconst results = [];\n\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\tresults.push( {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn results.length > 0 ? results : null;\n\t}\n\n\t/**\n\t * Returns the name of the element to match if there is exactly one pattern added to the matcher instance\n\t * and it matches element name defined by `string` (not `RegExp`). Otherwise, returns `null`.\n\t *\n\t * @returns {String|null} Element name trying to match.\n\t */\n\tgetElementName() {\n\t\tif ( this._patterns.length !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst pattern = this._patterns[ 0 ];\n\t\tconst name = pattern.name;\n\n\t\treturn ( typeof pattern != 'function' && name && !( name instanceof RegExp ) ) ? name : null;\n\t}\n}\n\n// Returns match information if {@link module:engine/view/element~Element element} is matching provided pattern.\n// If element cannot be matched to provided pattern - returns `null`.\n//\n// @param {module:engine/view/element~Element} element\n// @param {Object|String|RegExp|Function} pattern\n// @returns {Object|null} Returns object with match information or null if element is not matching.\nfunction isElementMatching( element, pattern ) {\n\t// If pattern is provided as function - return result of that function;\n\tif ( typeof pattern == 'function' ) {\n\t\treturn pattern( element );\n\t}\n\n\tconst match = {};\n\t// Check element's name.\n\tif ( pattern.name ) {\n\t\tmatch.name = matchName( pattern.name, element.name );\n\n\t\tif ( !match.name ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's attributes.\n\tif ( pattern.attributes ) {\n\t\tmatch.attributes = matchAttributes( pattern.attributes, element );\n\n\t\tif ( !match.attributes ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's classes.\n\tif ( pattern.classes ) {\n\t\tmatch.classes = matchClasses( pattern.classes, element );\n\n\t\tif ( !match.classes ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t// Check element's styles.\n\tif ( pattern.styles ) {\n\t\tmatch.styles = matchStyles( pattern.styles, element );\n\n\t\tif ( !match.styles ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if name can be matched by provided pattern.\n//\n// @param {String|RegExp} pattern\n// @param {String} name\n// @returns {Boolean} Returns `true` if name can be matched, `false` otherwise.\nfunction matchName( pattern, name ) {\n\t// If pattern is provided as RegExp - test against this regexp.\n\tif ( pattern instanceof RegExp ) {\n\t\treturn pattern.test( name );\n\t}\n\n\treturn pattern === name;\n}\n\n// Checks if attributes of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about attributes to match. Each key of the object will be\n// used as attribute name. Value of each key can be a string or regular expression to match against attribute value.\n// @param {module:engine/view/element~Element} element Element which attributes will be tested.\n// @returns {Array|null} Returns array with matched attribute names or `null` if no attributes were matched.\nfunction matchAttributes( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasAttribute( name ) ) {\n\t\t\tconst attribute = element.getAttribute( name );\n\n\t\t\tif ( pattern === true ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else if ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( attribute ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( attribute === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if classes of provided element can be matched against provided patterns.\n//\n// @param {Array.} patterns Array of strings or regular expressions to match against element's classes.\n// @param {module:engine/view/element~Element} element Element which classes will be tested.\n// @returns {Array|null} Returns array with matched class names or `null` if no classes were matched.\nfunction matchClasses( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const pattern of patterns ) {\n\t\tif ( pattern instanceof RegExp ) {\n\t\t\tconst classes = element.getClassNames();\n\n\t\t\tfor ( const name of classes ) {\n\t\t\t\tif ( pattern.test( name ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( match.length === 0 ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else if ( element.hasClass( pattern ) ) {\n\t\t\tmatch.push( pattern );\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if styles of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about styles to match. Each key of the object will be\n// used as style name. Value of each key can be a string or regular expression to match against style value.\n// @param {module:engine/view/element~Element} element Element which styles will be tested.\n// @returns {Array|null} Returns array with matched style names or `null` if no styles were matched.\nfunction matchStyles( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasStyle( name ) ) {\n\t\t\tconst style = element.getStyle( name );\n\n\t\t\tif ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( style ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( style === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n/**\n * An entity that is a valid pattern recognized by a matcher. `MatcherPattern` is used by {@link ~Matcher} to recognize\n * if a view element fits in a group of view elements described by the pattern.\n *\n * `MatcherPattern` can be given as a `String`, a `RegExp`, an `Object` or a `Function`.\n *\n * If `MatcherPattern` is given as a `String` or `RegExp`, it will match any view element that has a matching name:\n *\n *\t\t// Match any element with name equal to 'div'.\n *\t\tconst pattern = 'div';\n *\n *\t\t// Match any element which name starts on 'p'.\n *\t\tconst pattern = /^p/;\n *\n * If `MatcherPattern` is given as an `Object`, all the object's properties will be matched with view element properties.\n *\n *\t\t// Match view element's name.\n *\t\tconst pattern = { name: /^p/ };\n *\n *\t\t// Match view element which has matching attributes.\n *\t\tconst pattern = {\n *\t\t\tattributes: {\n *\t\t\t\ttitle: 'foobar',\t// Attribute title should equal 'foobar'.\n *\t\t\t\tfoo: /^\\w+/,\t\t// Attribute foo should match /^\\w+/ regexp.\n *\t\t\t\tbar: true\t\t\t// Attribute bar should be set (can be empty).\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Match view element which has given class.\n *\t\tconst pattern = {\n *\t\t\tclasses: 'foobar'\n *\t\t};\n *\n *\t\t// Match view element class using regular expression.\n *\t\tconst pattern = {\n *\t\t\tclasses: /foo.../\n *\t\t};\n *\n *\t\t// Multiple classes to match.\n *\t\tconst pattern = {\n *\t\t\tclasses: [ 'baz', 'bar', /foo.../ ]\n *\t\t};\n *\n *\t\t// Match view element which has given styles.\n *\t\tconst pattern = {\n *\t\t\tstyles: {\n *\t\t\t\tposition: 'absolute',\n *\t\t\t\tcolor: /^\\w*blue$/\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Pattern with multiple properties.\n *\t\tconst pattern = {\n *\t\t\tname: 'span',\n *\t\t\tstyles: {\n *\t\t\t\t'font-weight': 'bold'\n *\t\t\t},\n *\t\t\tclasses: 'highlighted'\n *\t\t};\n *\n * If `MatcherPattern` is given as a `Function`, the function takes a view element as a first and only parameter and\n * the function should decide whether that element matches. If so, it should return what part of the view element has been matched.\n * Otherwise, the function should return `null`. The returned result will be included in `match` property of the object\n * returned by {@link ~Matcher#match} call.\n *\n *\t\t// Match an empty
element.\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'div' && element.childCount > 0 ) {\n *\t\t\t\t// Return which part of the element was matched.\n *\t\t\t\treturn { name: true };\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n *\t\t// Match a

element with big font (\"heading-like\" element).\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'p' ) {\n *\t\t\t\tconst fontSize = element.getStyle( 'font-size' );\n *\t\t\t\tconst size = fontSize.match( /(\\d+)/px );\n *\n *\t\t\t\tif ( size && Number( size[ 1 ] ) > 26 ) {\n *\t\t\t\t\treturn { name: true, attribute: [ 'font-size' ] };\n *\t\t\t\t}\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n * `MatcherPattern` is defined in a way that it is a superset of {@link module:engine/view/elementdefinition~ElementDefinition},\n * that is, every `ElementDefinition` also can be used as a `MatcherPattern`.\n *\n * @typedef {String|RegExp|Object|Function} module:engine/view/matcher~MatcherPattern\n *\n * @property {String|RegExp} [name] View element name to match.\n * @property {String|RegExp|Array.} [classes] View element's class name(s) to match.\n * @property {Object} [styles] Object with key-value pairs representing styles to match.\n * Each object key represents style name. Value can be given as `String` or `RegExp`.\n * @property {Object} [attributes] Object with key-value pairs representing attributes to match.\n * Each object key represents attribute name. Value can be given as `String` or `RegExp`.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/element\n */\n\nimport Node from './node';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport objectToMap from '@ckeditor/ckeditor5-utils/src/objecttomap';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport Matcher from './matcher';\nimport { isPlainObject } from 'lodash-es';\n\n/**\n * View element.\n *\n * The editing engine does not define a fixed semantics of its elements (it is \"DTD-free\").\n * This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer. When creating an element you should use one of the following methods:\n *\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createContainerElement `downcastWriter#createContainerElement()`}\n * in order to create a {@link module:engine/view/containerelement~ContainerElement},\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createAttributeElement `downcastWriter#createAttributeElement()`}\n * in order to create a {@link module:engine/view/attributeelement~AttributeElement},\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`}\n * in order to create a {@link module:engine/view/emptyelement~EmptyElement}.\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`}\n * in order to create a {@link module:engine/view/uielement~UIElement}.\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createEditableElement `downcastWriter#createEditableElement()`}\n * in order to create a {@link module:engine/view/editableelement~EditableElement}.\n *\n * Note that for view elements which are not created from the model, like elements from mutations, paste or\n * {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element.\n * In such cases the {@link module:engine/view/upcastwriter~UpcastWriter#createElement `UpcastWriter#createElement()`} method\n * should be used to create generic view elements.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a view element.\n\t *\n\t * Attributes can be passed in various formats:\n\t *\n\t *\t\tnew Element( 'div', { class: 'editor', contentEditable: 'true' } ); // object\n\t *\t\tnew Element( 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator\n\t *\t\tnew Element( 'div', mapOfAttributes ); // map\n\t *\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * Name of the element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Map of attributes, where attributes names are keys and attributes values are values.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} #_attrs\n\t\t */\n\t\tthis._attrs = parseAttributes( attrs );\n\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.}\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\n\t\t/**\n\t\t * Set of classes associated with element instance.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._classes = new Set();\n\n\t\tif ( this._attrs.has( 'class' ) ) {\n\t\t\t// Remove class attribute and handle it by class set.\n\t\t\tconst classString = this._attrs.get( 'class' );\n\t\t\tparseClasses( this._classes, classString );\n\t\t\tthis._attrs.delete( 'class' );\n\t\t}\n\n\t\t/**\n\t\t * Map of styles.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} module:engine/view/element~Element#_styles\n\t\t */\n\t\tthis._styles = new Map();\n\n\t\tif ( this._attrs.has( 'style' ) ) {\n\t\t\t// Remove style attribute and handle it by styles map.\n\t\t\tparseInlineStyles( this._styles, this._attrs.get( 'style' ) );\n\t\t\tthis._attrs.delete( 'style' );\n\t\t}\n\n\t\t/**\n\t\t * Map of custom properties.\n\t\t * Custom properties can be added to element instance, will be cloned but not rendered into DOM.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map}\n\t\t */\n\t\tthis._customProperties = new Map();\n\t}\n\n\t/**\n\t * Number of element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._children.length === 0;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'element' || type == this.name || super.is( type );\n\t\t} else {\n\t\t\treturn type == 'element' && name == this.name;\n\t\t}\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.\n\t *\n\t * @returns {Iterable.} Keys for attributes.\n\t */\n\t* getAttributeKeys() {\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield 'class';\n\t\t}\n\n\t\tif ( this._styles.size > 0 ) {\n\t\t\tyield 'style';\n\t\t}\n\n\t\t// This is not an optimal solution because of https://github.com/ckeditor/ckeditor5-engine/issues/454.\n\t\t// It can be simplified to `yield* this._attrs.keys();`.\n\t\tfor ( const key of this._attrs.keys() ) {\n\t\t\tyield key;\n\t\t}\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this element's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getAttributes() {\n\t\tyield* this._attrs.entries();\n\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield [ 'class', this.getAttribute( 'class' ) ];\n\t\t}\n\n\t\tif ( this._styles.size > 0 ) {\n\t\t\tyield [ 'style', this.getAttribute( 'style' ) ];\n\t\t}\n\t}\n\n\t/**\n\t * Gets attribute by key. If attribute is not present - returns undefined.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {String|undefined} Attribute value.\n\t */\n\tgetAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\treturn [ ...this._classes ].join( ' ' );\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\tif ( this._styles.size > 0 ) {\n\t\t\t\tlet styleString = '';\n\n\t\t\t\tfor ( const [ property, value ] of this._styles ) {\n\t\t\t\t\tstyleString += `${ property }:${ value };`;\n\t\t\t\t}\n\n\t\t\t\treturn styleString;\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns a boolean indicating whether an attribute with the specified key exists in the element.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} `true` if attribute with the specified key exists in the element, false otherwise.\n\t */\n\thasAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\treturn this._classes.size > 0;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\treturn this._styles.size > 0;\n\t\t}\n\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t * Both elements should have the same name and attributes to be considered as similar. Two similar elements\n\t * can contain different set of children nodes.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\tif ( !( otherElement instanceof Element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If exactly the same Element is provided - return true immediately.\n\t\tif ( this === otherElement ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check element name.\n\t\tif ( this.name != otherElement.name ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check number of attributes, classes and styles.\n\t\tif ( this._attrs.size !== otherElement._attrs.size || this._classes.size !== otherElement._classes.size ||\n\t\t\tthis._styles.size !== otherElement._styles.size ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes are the same.\n\t\tfor ( const [ key, value ] of this._attrs ) {\n\t\t\tif ( !otherElement._attrs.has( key ) || otherElement._attrs.get( key ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if classes are the same.\n\t\tfor ( const className of this._classes ) {\n\t\t\tif ( !otherElement._classes.has( className ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles are the same.\n\t\tfor ( const [ property, value ] of this._styles ) {\n\t\t\tif ( !otherElement._styles.has( property ) || otherElement._styles.get( property ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns true if class is present.\n\t * If more then one class is provided - returns true only when all classes are present.\n\t *\n\t *\t\telement.hasClass( 'foo' ); // Returns true if 'foo' class is present.\n\t *\t\telement.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.\n\t *\n\t * @param {...String} className\n\t */\n\thasClass( ...className ) {\n\t\tfor ( const name of className ) {\n\t\t\tif ( !this._classes.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns iterator that contains all class names.\n\t *\n\t * @returns {Iterable.}\n\t */\n\tgetClassNames() {\n\t\treturn this._classes.keys();\n\t}\n\n\t/**\n\t * Returns style value for given property.\n\t * Undefined is returned if style does not exist.\n\t *\n\t * @param {String} property\n\t * @returns {String|undefined}\n\t */\n\tgetStyle( property ) {\n\t\treturn this._styles.get( property );\n\t}\n\n\t/**\n\t * Returns iterator that contains all style names.\n\t *\n\t * @returns {Iterable.}\n\t */\n\tgetStyleNames() {\n\t\treturn this._styles.keys();\n\t}\n\n\t/**\n\t * Returns true if style keys are present.\n\t * If more then one style property is provided - returns true only when all properties are present.\n\t *\n\t *\t\telement.hasStyle( 'color' ); // Returns true if 'border-top' style is present.\n\t *\t\telement.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.\n\t *\n\t * @param {...String} property\n\t */\n\thasStyle( ...property ) {\n\t\tfor ( const name of property ) {\n\t\t\tif ( !this._styles.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns ancestor element that match specified pattern.\n\t * Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.\n\t *\n\t * @see module:engine/view/matcher~Matcher\n\t * @param {Object|String|RegExp|Function} patterns Patterns used to match correct ancestor.\n\t * See {@link module:engine/view/matcher~Matcher}.\n\t * @returns {module:engine/view/element~Element|null} Found element or `null` if no matching ancestor was found.\n\t */\n\tfindAncestor( ...patterns ) {\n\t\tconst matcher = new Matcher( ...patterns );\n\t\tlet parent = this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( matcher.match( parent ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns the custom property value for the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @returns {*}\n\t */\n\tgetCustomProperty( key ) {\n\t\treturn this._customProperties.get( key );\n\t}\n\n\t/**\n\t * Returns an iterator which iterates over this element's custom properties.\n\t * Iterator provides `[ key, value ]` pairs for each stored property.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getCustomProperties() {\n\t\tyield* this._customProperties.entries();\n\t}\n\n\t/**\n\t * Returns identity string based on element's name, styles, classes and other attributes.\n\t * Two elements that {@link #isSimilar are similar} will have same identity string.\n\t * It has the following format:\n\t *\n\t *\t\t'name class=\"class1,class2\" style=\"style1:value1;style2:value2\" attr1=\"val1\" attr2=\"val2\"'\n \t *\n\t * For example:\n\t *\n\t *\t\tconst element = writer.createContainerElement( 'foo', {\n\t *\t\t\tbanana: '10',\n\t *\t\t\tapple: '20',\n\t *\t\t\tstyle: 'color: red; border-color: white;',\n\t *\t\t\tclass: 'baz'\n\t *\t\t} );\n\t *\n\t *\t\t// returns 'foo class=\"baz\" style=\"border-color:white;color:red\" apple=\"20\" banana=\"10\"'\n\t *\t\telement.getIdentity();\n\t *\n\t * NOTE: Classes, styles and other attributes are sorted alphabetically.\n\t *\n\t * @returns {String}\n\t */\n\tgetIdentity() {\n\t\tconst classes = Array.from( this._classes ).sort().join( ',' );\n\t\tconst styles = Array.from( this._styles ).map( i => `${ i[ 0 ] }:${ i[ 1 ] }` ).sort().join( ';' );\n\t\tconst attributes = Array.from( this._attrs ).map( i => `${ i[ 0 ] }=\"${ i[ 1 ] }\"` ).sort().join( ' ' );\n\n\t\treturn this.name +\n\t\t\t( classes == '' ? '' : ` class=\"${ classes }\"` ) +\n\t\t\t( styles == '' ? '' : ` style=\"${ styles }\"` ) +\n\t\t\t( attributes == '' ? '' : ` ${ attributes }` );\n\t}\n\n\t/**\n\t * Clones provided element.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/element~Element} Clone of this element.\n\t */\n\t_clone( deep = false ) {\n\t\tconst childrenClone = [];\n\n\t\tif ( deep ) {\n\t\t\tfor ( const child of this.getChildren() ) {\n\t\t\t\tchildrenClone.push( child._clone( deep ) );\n\t\t\t}\n\t\t}\n\n\t\t// ContainerElement and AttributeElement should be also cloned properly.\n\t\tconst cloned = new this.constructor( this.name, this._attrs, childrenClone );\n\n\t\t// Classes and styles are cloned separately - this solution is faster than adding them back to attributes and\n\t\t// parse once again in constructor.\n\t\tcloned._classes = new Set( this._classes );\n\t\tcloned._styles = new Map( this._styles );\n\n\t\t// Clone custom properties.\n\t\tcloned._customProperties = new Map( this._customProperties );\n\n\t\t// Clone filler offset method.\n\t\t// We can't define this method in a prototype because it's behavior which\n\t\t// is changed by e.g. toWidget() function from ckeditor5-widget. Perhaps this should be one of custom props.\n\t\tcloned.getFillerOffset = this.getFillerOffset;\n\n\t\treturn cloned;\n\t}\n\n\t/**\n\t * {@link module:engine/view/element~Element#_insertChild Insert} a child node or a list of child nodes at the end of this node\n\t * and sets the parent of these nodes to this element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#insert\n\t * @protected\n\t * @param {module:engine/view/item~Item|Iterable.} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#insert\n\t * @protected\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#remove\n\t * @protected\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Array.} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Adds or overwrite attribute with a specified key and value.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setAttribute( key, value ) {\n\t\tvalue = String( value );\n\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( key == 'class' ) {\n\t\t\tparseClasses( this._classes, value );\n\t\t} else if ( key == 'style' ) {\n\t\t\tparseInlineStyles( this._styles, value );\n\t\t} else {\n\t\t\tthis._attrs.set( key, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} Returns true if an attribute existed and has been removed.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\t// Remove class attribute.\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\tthis._classes.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove style attribute.\n\t\tif ( key == 'style' ) {\n\t\t\tif ( this._styles.size > 0 ) {\n\t\t\t\tthis._styles.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove other attributes.\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Adds specified class.\n\t *\n\t *\t\telement._addClass( 'foo' ); // Adds 'foo' class.\n\t *\t\telement._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#addClass\n\t * @protected\n\t * @param {Array.|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_addClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tclassName = Array.isArray( className ) ? className : [ className ];\n\t\tclassName.forEach( name => this._classes.add( name ) );\n\t}\n\n\t/**\n\t * Removes specified class.\n\t *\n\t *\t\telement._removeClass( 'foo' ); // Removes 'foo' class.\n\t *\t\telement._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeClass\n\t * @protected\n\t * @param {Array.|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tclassName = Array.isArray( className ) ? className : [ className ];\n\t\tclassName.forEach( name => this._classes.delete( name ) );\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\telement._setStyle( 'color', 'red' );\n\t *\t\telement._setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t} );\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setStyle\n\t * @protected\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setStyle( property, value ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( isPlainObject( property ) ) {\n\t\t\tconst keys = Object.keys( property );\n\n\t\t\tfor ( const key of keys ) {\n\t\t\t\tthis._styles.set( key, property[ key ] );\n\t\t\t}\n\t\t} else {\n\t\t\tthis._styles.set( property, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes specified style.\n\t *\n\t *\t\telement._removeStyle( 'color' ); // Removes 'color' style.\n\t *\t\telement._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeStyle\n\t * @protected\n\t * @param {Array.|String} property\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeStyle( property ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tproperty = Array.isArray( property ) ? property : [ property ];\n\t\tproperty.forEach( name => this._styles.delete( name ) );\n\t}\n\n\t/**\n\t * Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t */\n\t_setCustomProperty( key, value ) {\n\t\tthis._customProperties.set( key, value );\n\t}\n\n\t/**\n\t * Removes the custom property stored under the given key.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\t_removeCustomProperty( key ) {\n\t\treturn this._customProperties.delete( key );\n\t}\n\n\t/**\n\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t *\n\t * @abstract\n\t * @method module:engine/view/element~Element#getFillerOffset\n\t */\n}\n\n// Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed\n// as an object (instead of `Map`), the object is transformed to the map. Attributes with `null` value are removed.\n// Attributes with non-`String` value are converted to `String`.\n//\n// @param {Object|Map} attrs Attributes to parse.\n// @returns {Map} Parsed attributes.\nfunction parseAttributes( attrs ) {\n\tif ( isPlainObject( attrs ) ) {\n\t\tattrs = objectToMap( attrs );\n\t} else {\n\t\tattrs = new Map( attrs );\n\t}\n\n\tfor ( const [ key, value ] of attrs ) {\n\t\tif ( value === null ) {\n\t\t\tattrs.delete( key );\n\t\t} else if ( typeof value != 'string' ) {\n\t\t\tattrs.set( key, String( value ) );\n\t\t}\n\t}\n\n\treturn attrs;\n}\n\n// Parses inline styles and puts property - value pairs into styles map.\n// Styles map is cleared before insertion.\n//\n// @param {Map.} stylesMap Map to insert parsed properties and values.\n// @param {String} stylesString Styles to parse.\nfunction parseInlineStyles( stylesMap, stylesString ) {\n\t// `null` if no quote was found in input string or last found quote was a closing quote. See below.\n\tlet quoteType = null;\n\tlet propertyNameStart = 0;\n\tlet propertyValueStart = 0;\n\tlet propertyName = null;\n\n\tstylesMap.clear();\n\n\t// Do not set anything if input string is empty.\n\tif ( stylesString === '' ) {\n\t\treturn;\n\t}\n\n\t// Fix inline styles that do not end with `;` so they are compatible with algorithm below.\n\tif ( stylesString.charAt( stylesString.length - 1 ) != ';' ) {\n\t\tstylesString = stylesString + ';';\n\t}\n\n\t// Seek the whole string for \"special characters\".\n\tfor ( let i = 0; i < stylesString.length; i++ ) {\n\t\tconst char = stylesString.charAt( i );\n\n\t\tif ( quoteType === null ) {\n\t\t\t// No quote found yet or last found quote was a closing quote.\n\t\t\tswitch ( char ) {\n\t\t\t\tcase ':':\n\t\t\t\t\t// Most of time colon means that property name just ended.\n\t\t\t\t\t// Sometimes however `:` is found inside property value (for example in background image url).\n\t\t\t\t\tif ( !propertyName ) {\n\t\t\t\t\t\t// Treat this as end of property only if property name is not already saved.\n\t\t\t\t\t\t// Save property name.\n\t\t\t\t\t\tpropertyName = stylesString.substr( propertyNameStart, i - propertyNameStart );\n\t\t\t\t\t\t// Save this point as the start of property value.\n\t\t\t\t\t\tpropertyValueStart = i + 1;\n\t\t\t\t\t}\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase '\"':\n\t\t\t\tcase '\\'':\n\t\t\t\t\t// Opening quote found (this is an opening quote, because `quoteType` is `null`).\n\t\t\t\t\tquoteType = char;\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase ';': {\n\t\t\t\t\t// Property value just ended.\n\t\t\t\t\t// Use previously stored property value start to obtain property value.\n\t\t\t\t\tconst propertyValue = stylesString.substr( propertyValueStart, i - propertyValueStart );\n\n\t\t\t\t\tif ( propertyName ) {\n\t\t\t\t\t\t// Save parsed part.\n\t\t\t\t\t\tstylesMap.set( propertyName.trim(), propertyValue.trim() );\n\t\t\t\t\t}\n\n\t\t\t\t\tpropertyName = null;\n\n\t\t\t\t\t// Save this point as property name start. Property name starts immediately after previous property value ends.\n\t\t\t\t\tpropertyNameStart = i + 1;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} else if ( char === quoteType ) {\n\t\t\t// If a quote char is found and it is a closing quote, mark this fact by `null`-ing `quoteType`.\n\t\t\tquoteType = null;\n\t\t}\n\t}\n}\n\n// Parses class attribute and puts all classes into classes set.\n// Classes set s cleared before insertion.\n//\n// @param {Set.} classesSet Set to insert parsed classes.\n// @param {String} classesString String with classes to parse.\nfunction parseClasses( classesSet, classesString ) {\n\tconst classArray = classesString.split( /\\s+/ );\n\tclassesSet.clear();\n\tclassArray.forEach( name => classesSet.add( name ) );\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.}\n// @returns {Iterable.}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/containerelement\n */\n\nimport Element from './element';\n\n/**\n * Containers are elements which define document structure. They define boundaries for\n * {@link module:engine/view/attributeelement~AttributeElement attributes}. They are mostly used for block elements like `

` or `

`.\n *\n * Editing engine does not define a fixed HTML DTD. This is why a feature developer needs to choose between various\n * types (container element, {@link module:engine/view/attributeelement~AttributeElement attribute element},\n * {@link module:engine/view/emptyelement~EmptyElement empty element}, etc) when developing a feature.\n *\n * The container element should be your default choice when writing a converter, unless:\n *\n * * this element represents a model text attribute (then use {@link module:engine/view/attributeelement~AttributeElement}),\n * * this is an empty element like `` (then use {@link module:engine/view/emptyelement~EmptyElement}),\n * * this is a root element,\n * * this is a nested editable element (then use {@link module:engine/view/editableelement~EditableElement}).\n *\n * To create a new container element instance use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createContainerElement `DowncastWriter#createContainerElement()`}\n * method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class ContainerElement extends Element {\n\t/**\n\t * Creates a container element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createContainerElement\n\t * @see module:engine/view/element~Element\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'containerElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'containerElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n}\n\n/**\n * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n *\n * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n */\nexport function getFillerOffset() {\n\tconst children = [ ...this.getChildren() ];\n\tconst lastChild = children[ this.childCount - 1 ];\n\n\t// Block filler is required after a `
` if it's the last element in its container. See #1422.\n\tif ( lastChild && lastChild.is( 'element', 'br' ) ) {\n\t\treturn this.childCount;\n\t}\n\n\tfor ( const child of children ) {\n\t\t// If there's any non-UI element – don't render the bogus.\n\t\tif ( !child.is( 'uiElement' ) ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// If there are only UI elements – render the bogus at the end of the element.\n\treturn this.childCount;\n}\n","/**\n * This method returns the first argument it receives.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Util\n * @param {*} value Any value.\n * @returns {*} Returns `value`.\n * @example\n *\n * var object = { 'a': 1 };\n *\n * console.log(_.identity(object) === object);\n * // => true\n */\nfunction identity(value) {\n return value;\n}\n\nexport default identity;\n","/**\n * A faster alternative to `Function#apply`, this function invokes `func`\n * with the `this` binding of `thisArg` and the arguments of `args`.\n *\n * @private\n * @param {Function} func The function to invoke.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {Array} args The arguments to invoke `func` with.\n * @returns {*} Returns the result of `func`.\n */\nfunction apply(func, thisArg, args) {\n switch (args.length) {\n case 0: return func.call(thisArg);\n case 1: return func.call(thisArg, args[0]);\n case 2: return func.call(thisArg, args[0], args[1]);\n case 3: return func.call(thisArg, args[0], args[1], args[2]);\n }\n return func.apply(thisArg, args);\n}\n\nexport default apply;\n","import apply from './_apply.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max;\n\n/**\n * A specialized version of `baseRest` which transforms the rest array.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @param {Function} transform The rest array transform.\n * @returns {Function} Returns the new function.\n */\nfunction overRest(func, start, transform) {\n start = nativeMax(start === undefined ? (func.length - 1) : start, 0);\n return function() {\n var args = arguments,\n index = -1,\n length = nativeMax(args.length - start, 0),\n array = Array(length);\n\n while (++index < length) {\n array[index] = args[start + index];\n }\n index = -1;\n var otherArgs = Array(start + 1);\n while (++index < start) {\n otherArgs[index] = args[index];\n }\n otherArgs[start] = transform(array);\n return apply(func, this, otherArgs);\n };\n}\n\nexport default overRest;\n","/**\n * Creates a function that returns `value`.\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Util\n * @param {*} value The value to return from the new function.\n * @returns {Function} Returns the new constant function.\n * @example\n *\n * var objects = _.times(2, _.constant({ 'a': 1 }));\n *\n * console.log(objects);\n * // => [{ 'a': 1 }, { 'a': 1 }]\n *\n * console.log(objects[0] === objects[1]);\n * // => true\n */\nfunction constant(value) {\n return function() {\n return value;\n };\n}\n\nexport default constant;\n","import constant from './constant.js';\nimport defineProperty from './_defineProperty.js';\nimport identity from './identity.js';\n\n/**\n * The base implementation of `setToString` without support for hot loop shorting.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\nvar baseSetToString = !defineProperty ? identity : function(func, string) {\n return defineProperty(func, 'toString', {\n 'configurable': true,\n 'enumerable': false,\n 'value': constant(string),\n 'writable': true\n });\n};\n\nexport default baseSetToString;\n","/** Used to detect hot functions by number of calls within a span of milliseconds. */\nvar HOT_COUNT = 800,\n HOT_SPAN = 16;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeNow = Date.now;\n\n/**\n * Creates a function that'll short out and invoke `identity` instead\n * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`\n * milliseconds.\n *\n * @private\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new shortable function.\n */\nfunction shortOut(func) {\n var count = 0,\n lastCalled = 0;\n\n return function() {\n var stamp = nativeNow(),\n remaining = HOT_SPAN - (stamp - lastCalled);\n\n lastCalled = stamp;\n if (remaining > 0) {\n if (++count >= HOT_COUNT) {\n return arguments[0];\n }\n } else {\n count = 0;\n }\n return func.apply(undefined, arguments);\n };\n}\n\nexport default shortOut;\n","import baseSetToString from './_baseSetToString.js';\nimport shortOut from './_shortOut.js';\n\n/**\n * Sets the `toString` method of `func` to return `string`.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\nvar setToString = shortOut(baseSetToString);\n\nexport default setToString;\n","import identity from './identity.js';\nimport overRest from './_overRest.js';\nimport setToString from './_setToString.js';\n\n/**\n * The base implementation of `_.rest` which doesn't validate or coerce arguments.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @returns {Function} Returns the new function.\n */\nfunction baseRest(func, start) {\n return setToString(overRest(func, start, identity), func + '');\n}\n\nexport default baseRest;\n","import eq from './eq.js';\nimport isArrayLike from './isArrayLike.js';\nimport isIndex from './_isIndex.js';\nimport isObject from './isObject.js';\n\n/**\n * Checks if the given arguments are from an iteratee call.\n *\n * @private\n * @param {*} value The potential iteratee value argument.\n * @param {*} index The potential iteratee index or key argument.\n * @param {*} object The potential iteratee object argument.\n * @returns {boolean} Returns `true` if the arguments are from an iteratee call,\n * else `false`.\n */\nfunction isIterateeCall(value, index, object) {\n if (!isObject(object)) {\n return false;\n }\n var type = typeof index;\n if (type == 'number'\n ? (isArrayLike(object) && isIndex(index, object.length))\n : (type == 'string' && index in object)\n ) {\n return eq(object[index], value);\n }\n return false;\n}\n\nexport default isIterateeCall;\n","import baseRest from './_baseRest.js';\nimport isIterateeCall from './_isIterateeCall.js';\n\n/**\n * Creates a function like `_.assign`.\n *\n * @private\n * @param {Function} assigner The function to assign values.\n * @returns {Function} Returns the new assigner function.\n */\nfunction createAssigner(assigner) {\n return baseRest(function(object, sources) {\n var index = -1,\n length = sources.length,\n customizer = length > 1 ? sources[length - 1] : undefined,\n guard = length > 2 ? sources[2] : undefined;\n\n customizer = (assigner.length > 3 && typeof customizer == 'function')\n ? (length--, customizer)\n : undefined;\n\n if (guard && isIterateeCall(sources[0], sources[1], guard)) {\n customizer = length < 3 ? undefined : customizer;\n length = 1;\n }\n object = Object(object);\n while (++index < length) {\n var source = sources[index];\n if (source) {\n assigner(object, source, index, customizer);\n }\n }\n return object;\n });\n}\n\nexport default createAssigner;\n","import copyObject from './_copyObject.js';\nimport createAssigner from './_createAssigner.js';\nimport keysIn from './keysIn.js';\n\n/**\n * This method is like `_.assign` except that it iterates over own and\n * inherited source properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extend\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assign\n * @example\n *\n * function Foo() {\n * this.a = 1;\n * }\n *\n * function Bar() {\n * this.c = 3;\n * }\n *\n * Foo.prototype.b = 2;\n * Bar.prototype.d = 4;\n *\n * _.assignIn({ 'a': 0 }, new Foo, new Bar);\n * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }\n */\nvar assignIn = createAssigner(function(object, source) {\n copyObject(source, keysIn(source), object);\n});\n\nexport default assignIn;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/observablemixin\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport { extend, isObject } from 'lodash-es';\n\nconst observablePropertiesSymbol = Symbol( 'observableProperties' );\nconst boundObservablesSymbol = Symbol( 'boundObservables' );\nconst boundPropertiesSymbol = Symbol( 'boundProperties' );\n\n/**\n * Mixin that injects the \"observable properties\" and data binding functionality described in the\n * {@link ~Observable} interface.\n *\n * Read more about the concept of observables in the:\n * * {@glink framework/guides/architecture/core-editor-architecture#event-system-and-observables \"Event system and observables\"}\n * section of the {@glink framework/guides/architecture/core-editor-architecture \"Core editor architecture\"} guide,\n * * {@glink framework/guides/deep-dive/observables \"Observables\" deep dive} guide.\n *\n * @mixin ObservableMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/observablemixin~Observable\n */\nconst ObservableMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tset( name, value ) {\n\t\t// If the first parameter is an Object, iterate over its properties.\n\t\tif ( isObject( name ) ) {\n\t\t\tObject.keys( name ).forEach( property => {\n\t\t\t\tthis.set( property, name[ property ] );\n\t\t\t}, this );\n\n\t\t\treturn;\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst properties = this[ observablePropertiesSymbol ];\n\n\t\tif ( ( name in this ) && !properties.has( name ) ) {\n\t\t\t/**\n\t\t\t * Cannot override an existing property.\n\t\t\t *\n\t\t\t * This error is thrown when trying to {@link ~Observable#set set} an property with\n\t\t\t * a name of an already existing property. For example:\n\t\t\t *\n\t\t\t *\t\tlet observable = new Model();\n\t\t\t *\t\tobservable.property = 1;\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// throws\n\t\t\t *\n\t\t\t *\t\tobservable.set( 'property', 1 );\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// ok, because this is an existing property.\n\t\t\t *\n\t\t\t * @error observable-set-cannot-override\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-set-cannot-override: Cannot override an existing property.' );\n\t\t}\n\n\t\tObject.defineProperty( this, name, {\n\t\t\tenumerable: true,\n\t\t\tconfigurable: true,\n\n\t\t\tget() {\n\t\t\t\treturn properties.get( name );\n\t\t\t},\n\n\t\t\tset( value ) {\n\t\t\t\tconst oldValue = properties.get( name );\n\n\t\t\t\t// Fire `set` event before the new value will be set to make it possible\n\t\t\t\t// to override observable property without affecting `change` event.\n\t\t\t\t// See https://github.com/ckeditor/ckeditor5-utils/issues/171.\n\t\t\t\tlet newValue = this.fire( 'set:' + name, name, value, oldValue );\n\n\t\t\t\tif ( newValue === undefined ) {\n\t\t\t\t\tnewValue = value;\n\t\t\t\t}\n\n\t\t\t\t// Allow undefined as an initial value like A.define( 'x', undefined ) (#132).\n\t\t\t\t// Note: When properties map has no such own property, then its value is undefined.\n\t\t\t\tif ( oldValue !== newValue || !properties.has( name ) ) {\n\t\t\t\t\tproperties.set( name, newValue );\n\t\t\t\t\tthis.fire( 'change:' + name, name, newValue, oldValue );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\tthis[ name ] = value;\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tbind( ...bindProperties ) {\n\t\tif ( !bindProperties.length || !isStringArray( bindProperties ) ) {\n\t\t\t/**\n\t\t\t * All properties must be strings.\n\t\t\t *\n\t\t\t * @error observable-bind-wrong-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-wrong-properties: All properties must be strings.' );\n\t\t}\n\n\t\tif ( ( new Set( bindProperties ) ).size !== bindProperties.length ) {\n\t\t\t/**\n\t\t\t * Properties must be unique.\n\t\t\t *\n\t\t\t * @error observable-bind-duplicate-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-duplicate-properties: Properties must be unique.' );\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\n\t\tbindProperties.forEach( propertyName => {\n\t\t\tif ( boundProperties.has( propertyName ) ) {\n\t\t\t\t/**\n\t\t\t\t * Cannot bind the same property more that once.\n\t\t\t\t *\n\t\t\t\t * @error observable-bind-rebind\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-bind-rebind: Cannot bind the same property more that once.' );\n\t\t\t}\n\t\t} );\n\n\t\tconst bindings = new Map();\n\n\t\t// @typedef {Object} Binding\n\t\t// @property {Array} property Property which is bound.\n\t\t// @property {Array} to Array of observable–property components of the binding (`{ observable: ..., property: .. }`).\n\t\t// @property {Array} callback A function which processes `to` components.\n\t\tbindProperties.forEach( a => {\n\t\t\tconst binding = { property: a, to: [] };\n\n\t\t\tboundProperties.set( a, binding );\n\t\t\tbindings.set( a, binding );\n\t\t} );\n\n\t\t// @typedef {Object} BindChain\n\t\t// @property {Function} to See {@link ~ObservableMixin#_bindTo}.\n\t\t// @property {Function} toMany See {@link ~ObservableMixin#_bindToMany}.\n\t\t// @property {module:utils/observablemixin~Observable} _observable The observable which initializes the binding.\n\t\t// @property {Array} _bindProperties Array of `_observable` properties to be bound.\n\t\t// @property {Array} _to Array of `to()` observable–properties (`{ observable: toObservable, properties: ...toProperties }`).\n\t\t// @property {Map} _bindings Stores bindings to be kept in\n\t\t// {@link ~ObservableMixin#_boundProperties}/{@link ~ObservableMixin#_boundObservables}\n\t\t// initiated in this binding chain.\n\t\treturn {\n\t\t\tto: bindTo,\n\t\t\ttoMany: bindToMany,\n\n\t\t\t_observable: this,\n\t\t\t_bindProperties: bindProperties,\n\t\t\t_to: [],\n\t\t\t_bindings: bindings\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tunbind( ...unbindProperties ) {\n\t\t// Nothing to do here if not inited yet.\n\t\tif ( !( observablePropertiesSymbol in this ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\t\tconst boundObservables = this[ boundObservablesSymbol ];\n\n\t\tif ( unbindProperties.length ) {\n\t\t\tif ( !isStringArray( unbindProperties ) ) {\n\t\t\t\t/**\n\t\t\t\t * Properties must be strings.\n\t\t\t\t *\n\t\t\t\t * @error observable-unbind-wrong-properties\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-unbind-wrong-properties: Properties must be strings.' );\n\t\t\t}\n\n\t\t\tunbindProperties.forEach( propertyName => {\n\t\t\t\tconst binding = boundProperties.get( propertyName );\n\n\t\t\t\t// Nothing to do if the binding is not defined\n\t\t\t\tif ( !binding ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tlet toObservable, toProperty, toProperties, toPropertyBindings;\n\n\t\t\t\tbinding.to.forEach( to => {\n\t\t\t\t\t// TODO: ES6 destructuring.\n\t\t\t\t\ttoObservable = to[ 0 ];\n\t\t\t\t\ttoProperty = to[ 1 ];\n\t\t\t\t\ttoProperties = boundObservables.get( toObservable );\n\t\t\t\t\ttoPropertyBindings = toProperties[ toProperty ];\n\n\t\t\t\t\ttoPropertyBindings.delete( binding );\n\n\t\t\t\t\tif ( !toPropertyBindings.size ) {\n\t\t\t\t\t\tdelete toProperties[ toProperty ];\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( !Object.keys( toProperties ).length ) {\n\t\t\t\t\t\tboundObservables.delete( toObservable );\n\t\t\t\t\t\tthis.stopListening( toObservable, 'change' );\n\t\t\t\t\t}\n\t\t\t\t} );\n\n\t\t\t\tboundProperties.delete( propertyName );\n\t\t\t} );\n\t\t} else {\n\t\t\tboundObservables.forEach( ( bindings, boundObservable ) => {\n\t\t\t\tthis.stopListening( boundObservable, 'change' );\n\t\t\t} );\n\n\t\t\tboundObservables.clear();\n\t\t\tboundProperties.clear();\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdecorate( methodName ) {\n\t\tconst originalMethod = this[ methodName ];\n\n\t\tif ( !originalMethod ) {\n\t\t\t/**\n\t\t\t * Cannot decorate an undefined method.\n\t\t\t *\n\t\t\t * @error observablemixin-cannot-decorate-undefined\n\t\t\t * @param {Object} object The object which method should be decorated.\n\t\t\t * @param {String} methodName Name of the method which does not exist.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'observablemixin-cannot-decorate-undefined: Cannot decorate an undefined method.',\n\t\t\t\t{ object: this, methodName }\n\t\t\t);\n\t\t}\n\n\t\tthis.on( methodName, ( evt, args ) => {\n\t\t\tevt.return = originalMethod.apply( this, args );\n\t\t} );\n\n\t\tthis[ methodName ] = function( ...args ) {\n\t\t\treturn this.fire( methodName, args );\n\t\t};\n\t}\n};\n\nextend( ObservableMixin, EmitterMixin );\n\nexport default ObservableMixin;\n\n// Init symbol properties needed to for the observable mechanism to work.\n//\n// @private\n// @param {module:utils/observablemixin~ObservableMixin} observable\nfunction initObservable( observable ) {\n\t// Do nothing if already inited.\n\tif ( observablePropertiesSymbol in observable ) {\n\t\treturn;\n\t}\n\n\t// The internal hash containing the observable's state.\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, observablePropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Map containing bindings to external observables. It shares the binding objects\n\t// (`{ observable: A, property: 'a', to: ... }`) with {@link module:utils/observablemixin~ObservableMixin#_boundProperties} and\n\t// it is used to observe external observables to update own properties accordingly.\n\t// See {@link module:utils/observablemixin~ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\tz: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t},\n\t//\t\t\t\tC: {\n\t//\t\t\t\t\tw: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundObservablesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Object that stores which properties of this observable are bound and how. It shares\n\t// the binding objects (`{ observable: A, property: 'a', to: ... }`) with {@link utils.ObservableMixin#_boundObservables}.\n\t// This data structure is a reverse of {@link utils.ObservableMixin#_boundObservables} and it is helpful for\n\t// {@link utils.ObservableMixin#unbind}.\n\t//\n\t// See {@link utils.ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\td: { observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundPropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n}\n\n// A chaining for {@link module:utils/observablemixin~ObservableMixin#bind} providing `.to()` interface.\n//\n// @private\n// @param {...[Observable|String|Function]} args Arguments of the `.to( args )` binding.\nfunction bindTo( ...args ) {\n\tconst parsedArgs = parseBindToArgs( ...args );\n\tconst bindingsKeys = Array.from( this._bindings.keys() );\n\tconst numberOfBindings = bindingsKeys.length;\n\n\t// Eliminate A.bind( 'x' ).to( B, C )\n\tif ( !parsedArgs.callback && parsedArgs.to.length > 1 ) {\n\t\t/**\n\t\t * Binding multiple observables only possible with callback.\n\t\t *\n\t\t * @error observable-bind-no-callback\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-no-callback: Binding multiple observables only possible with callback.' );\n\t}\n\n\t// Eliminate A.bind( 'x', 'y' ).to( B, callback )\n\tif ( numberOfBindings > 1 && parsedArgs.callback ) {\n\t\t/**\n\t\t * Cannot bind multiple properties and use a callback in one binding.\n\t\t *\n\t\t * @error observable-bind-to-extra-callback\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-extra-callback: Cannot bind multiple properties and use a callback in one binding.' );\n\t}\n\n\tparsedArgs.to.forEach( to => {\n\t\t// Eliminate A.bind( 'x', 'y' ).to( B, 'a' )\n\t\tif ( to.properties.length && to.properties.length !== numberOfBindings ) {\n\t\t\t/**\n\t\t\t * The number of properties must match.\n\t\t\t *\n\t\t\t * @error observable-bind-to-properties-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-to-properties-length: The number of properties must match.' );\n\t\t}\n\n\t\t// When no to.properties specified, observing source properties instead i.e.\n\t\t// A.bind( 'x', 'y' ).to( B ) -> Observe B.x and B.y\n\t\tif ( !to.properties.length ) {\n\t\t\tto.properties = this._bindProperties;\n\t\t}\n\t} );\n\n\tthis._to = parsedArgs.to;\n\n\t// Fill {@link BindChain#_bindings} with callback. When the callback is set there's only one binding.\n\tif ( parsedArgs.callback ) {\n\t\tthis._bindings.get( bindingsKeys[ 0 ] ).callback = parsedArgs.callback;\n\t}\n\n\tattachBindToListeners( this._observable, this._to );\n\n\t// Update observable._boundProperties and observable._boundObservables.\n\tupdateBindToBound( this );\n\n\t// Set initial values of bound properties.\n\tthis._bindProperties.forEach( propertyName => {\n\t\tupdateBoundObservableProperty( this._observable, propertyName );\n\t} );\n}\n\n// Binds to an attribute in a set of iterable observables.\n//\n// @private\n// @param {Array.} observables\n// @param {String} attribute\n// @param {Function} callback\nfunction bindToMany( observables, attribute, callback ) {\n\tif ( this._bindings.size > 1 ) {\n\t\t/**\n\t\t * Binding one attribute to many observables only possible with one attribute.\n\t\t *\n\t\t * @error observable-bind-to-many-not-one-binding\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-many-not-one-binding: Cannot bind multiple properties with toMany().' );\n\t}\n\n\tthis.to(\n\t\t// Bind to #attribute of each observable...\n\t\t...getBindingTargets( observables, attribute ),\n\t\t// ...using given callback to parse attribute values.\n\t\tcallback\n\t);\n}\n\n// Returns an array of binding components for\n// {@link Observable#bind} from a set of iterable observables.\n//\n// @param {Array.} observables\n// @param {String} attribute\n// @returns {Array.}\nfunction getBindingTargets( observables, attribute ) {\n\tconst observableAndAttributePairs = observables.map( observable => [ observable, attribute ] );\n\n\t// Merge pairs to one-dimension array of observables and attributes.\n\treturn Array.prototype.concat.apply( [], observableAndAttributePairs );\n}\n\n// Check if all entries of the array are of `String` type.\n//\n// @private\n// @param {Array} arr An array to be checked.\n// @returns {Boolean}\nfunction isStringArray( arr ) {\n\treturn arr.every( a => typeof a == 'string' );\n}\n\n// Parses and validates {@link Observable#bind}`.to( args )` arguments and returns\n// an object with a parsed structure. For example\n//\n//\t\tA.bind( 'x' ).to( B, 'a', C, 'b', call );\n//\n// becomes\n//\n//\t\t{\n//\t\t\tto: [\n//\t\t\t\t{ observable: B, properties: [ 'a' ] },\n//\t\t\t\t{ observable: C, properties: [ 'b' ] },\n//\t\t\t],\n//\t\t\tcallback: call\n// \t\t}\n//\n// @private\n// @param {...*} args Arguments of {@link Observable#bind}`.to( args )`.\n// @returns {Object}\nfunction parseBindToArgs( ...args ) {\n\t// Eliminate A.bind( 'x' ).to()\n\tif ( !args.length ) {\n\t\t/**\n\t\t * Invalid argument syntax in `to()`.\n\t\t *\n\t\t * @error observable-bind-to-parse-error\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-parse-error: Invalid argument syntax in `to()`.' );\n\t}\n\n\tconst parsed = { to: [] };\n\tlet lastObservable;\n\n\tif ( typeof args[ args.length - 1 ] == 'function' ) {\n\t\tparsed.callback = args.pop();\n\t}\n\n\targs.forEach( a => {\n\t\tif ( typeof a == 'string' ) {\n\t\t\tlastObservable.properties.push( a );\n\t\t} else if ( typeof a == 'object' ) {\n\t\t\tlastObservable = { observable: a, properties: [] };\n\t\t\tparsed.to.push( lastObservable );\n\t\t} else {\n\t\t\tthrow new CKEditorError( 'observable-bind-to-parse-error: Invalid argument syntax in `to()`.' );\n\t\t}\n\t} );\n\n\treturn parsed;\n}\n\n// Synchronizes {@link module:utils/observablemixin#_boundObservables} with {@link Binding}.\n//\n// @private\n// @param {Binding} binding A binding to store in {@link Observable#_boundObservables}.\n// @param {Observable} toObservable A observable, which is a new component of `binding`.\n// @param {String} toPropertyName A name of `toObservable`'s property, a new component of the `binding`.\nfunction updateBoundObservables( observable, binding, toObservable, toPropertyName ) {\n\tconst boundObservables = observable[ boundObservablesSymbol ];\n\tconst bindingsToObservable = boundObservables.get( toObservable );\n\tconst bindings = bindingsToObservable || {};\n\n\tif ( !bindings[ toPropertyName ] ) {\n\t\tbindings[ toPropertyName ] = new Set();\n\t}\n\n\t// Pass the binding to a corresponding Set in `observable._boundObservables`.\n\tbindings[ toPropertyName ].add( binding );\n\n\tif ( !bindingsToObservable ) {\n\t\tboundObservables.set( toObservable, bindings );\n\t}\n}\n\n// Synchronizes {@link Observable#_boundProperties} and {@link Observable#_boundObservables}\n// with {@link BindChain}.\n//\n// Assuming the following binding being created\n//\n// \t\tA.bind( 'a', 'b' ).to( B, 'x', 'y' );\n//\n// the following bindings were initialized by {@link Observable#bind} in {@link BindChain#_bindings}:\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [] },\n// \t\t\tb: { observable: A, property: 'b', to: [] },\n// \t\t}\n//\n// Iterate over all bindings in this chain and fill their `to` properties with\n// corresponding to( ... ) arguments (components of the binding), so\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [ B, 'x' ] },\n// \t\t\tb: { observable: A, property: 'b', to: [ B, 'y' ] },\n// \t\t}\n//\n// Then update the structure of {@link Observable#_boundObservables} with updated\n// binding, so it becomes:\n//\n// \t\tMap( {\n// \t\t\tB: {\n// \t\t\t\tx: Set( [\n// \t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] }\n// \t\t\t\t] ),\n// \t\t\t\ty: Set( [\n// \t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n// \t\t\t\t] )\n//\t\t\t}\n// \t\t} )\n//\n// @private\n// @param {BindChain} chain The binding initialized by {@link Observable#bind}.\nfunction updateBindToBound( chain ) {\n\tlet toProperty;\n\n\tchain._bindings.forEach( ( binding, propertyName ) => {\n\t\t// Note: For a binding without a callback, this will run only once\n\t\t// like in A.bind( 'x', 'y' ).to( B, 'a', 'b' )\n\t\t// TODO: ES6 destructuring.\n\t\tchain._to.forEach( to => {\n\t\t\ttoProperty = to.properties[ binding.callback ? 0 : chain._bindProperties.indexOf( propertyName ) ];\n\n\t\t\tbinding.to.push( [ to.observable, toProperty ] );\n\t\t\tupdateBoundObservables( chain._observable, binding, to.observable, toProperty );\n\t\t} );\n\t} );\n}\n\n// Updates an property of a {@link Observable} with a value\n// determined by an entry in {@link Observable#_boundProperties}.\n//\n// @private\n// @param {Observable} observable A observable which property is to be updated.\n// @param {String} propertyName An property to be updated.\nfunction updateBoundObservableProperty( observable, propertyName ) {\n\tconst boundProperties = observable[ boundPropertiesSymbol ];\n\tconst binding = boundProperties.get( propertyName );\n\tlet propertyValue;\n\n\t// When a binding with callback is created like\n\t//\n\t// \t\tA.bind( 'a' ).to( B, 'b', C, 'c', callback );\n\t//\n\t// collect B.b and C.c, then pass them to callback to set A.a.\n\tif ( binding.callback ) {\n\t\tpropertyValue = binding.callback.apply( observable, binding.to.map( to => to[ 0 ][ to[ 1 ] ] ) );\n\t} else {\n\t\tpropertyValue = binding.to[ 0 ];\n\t\tpropertyValue = propertyValue[ 0 ][ propertyValue[ 1 ] ];\n\t}\n\n\tif ( observable.hasOwnProperty( propertyName ) ) {\n\t\tobservable[ propertyName ] = propertyValue;\n\t} else {\n\t\tobservable.set( propertyName, propertyValue );\n\t}\n}\n\n// Starts listening to changes in {@link BindChain._to} observables to update\n// {@link BindChain._observable} {@link BindChain._bindProperties}. Also sets the\n// initial state of {@link BindChain._observable}.\n//\n// @private\n// @param {BindChain} chain The chain initialized by {@link Observable#bind}.\nfunction attachBindToListeners( observable, toBindings ) {\n\ttoBindings.forEach( to => {\n\t\tconst boundObservables = observable[ boundObservablesSymbol ];\n\t\tlet bindings;\n\n\t\t// If there's already a chain between the observables (`observable` listens to\n\t\t// `to.observable`), there's no need to create another `change` event listener.\n\t\tif ( !boundObservables.get( to.observable ) ) {\n\t\t\tobservable.listenTo( to.observable, 'change', ( evt, propertyName ) => {\n\t\t\t\tbindings = boundObservables.get( to.observable )[ propertyName ];\n\n\t\t\t\t// Note: to.observable will fire for any property change, react\n\t\t\t\t// to changes of properties which are bound only.\n\t\t\t\tif ( bindings ) {\n\t\t\t\t\tbindings.forEach( binding => {\n\t\t\t\t\t\tupdateBoundObservableProperty( observable, binding.property );\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t} );\n}\n\n/**\n * Interface which adds \"observable properties\" and data binding functionality.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/observablemixin~ObservableMixin} mixin.\n *\n * Read more about the usage of this interface in the:\n * * {@glink framework/guides/architecture/core-editor-architecture#event-system-and-observables \"Event system and observables\"}\n * section of the {@glink framework/guides/architecture/core-editor-architecture \"Core editor architecture\"} guide,\n * * {@glink framework/guides/deep-dive/observables \"Observables\" deep dive} guide.\n *\n * @interface Observable\n * @extends module:utils/emittermixin~Emitter\n */\n\n/**\n * Fired when a property changed value.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'prop has changed from 1 to 2'\n *\n * @event change:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Fired when a property value is going to be set but is not set yet (before the `change` event is fired).\n *\n * You can control the final value of the property by using\n * the {@link module:utils/eventinfo~EventInfo#return event's `return` property}.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );\n *\t\t\tconsole.log( `Current property value is ${ observable[ propertyName ] }` );\n *\n *\t\t\t// Let's override the value.\n *\t\t\tevt.return = 3;\n *\t\t} );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'Value is going to be changed from 1 to 2'\n *\t\t // -> 'Current property value is 1'\n *\t\t // -> 'Value has changed from 1 to 3'\n *\n * **Note:** Event is fired even when the new value is the same as the old value.\n *\n * @event set:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Creates and sets the value of an observable property of this object. Such an property becomes a part\n * of the state and is be observable.\n *\n * It accepts also a single object literal containing key/value pairs with properties to be set.\n *\n * This method throws the `observable-set-cannot-override` error if the observable instance already\n * have a property with the given property name. This prevents from mistakenly overriding existing\n * properties and methods, but means that `foo.set( 'bar', 1 )` may be slightly slower than `foo.bar = 1`.\n *\n * @method #set\n * @param {String|Object} name The property's name or object with `name=>value` pairs.\n * @param {*} [value] The property's value (if `name` was passed in the first parameter).\n */\n\n/**\n * Binds {@link #set obvervable properties} to other objects implementing the\n * {@link module:utils/observablemixin~Observable} interface.\n *\n * Read more in the {@glink framework/guides/deep-dive/observables#property-bindings dedicated guide}\n * covering the topic of property bindings with some additional examples.\n *\n * Let's consider two objects: a `button` and an associated `command` (both `Observable`).\n *\n * A simple property binding could be as follows:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled' );\n *\n * or even shorter:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command );\n *\n * which works in the following way:\n *\n * * `button.isEnabled` **instantly equals** `command.isEnabled`,\n * * whenever `command.isEnabled` changes, `button.isEnabled` will immediately reflect its value.\n *\n * **Note**: To release the binding use {@link module:utils/observablemixin~Observable#unbind}.\n *\n * You can also \"rename\" the property in the binding by specifying the new name in the `to()` chain:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isWorking' );\n *\n * It is possible to bind more than one property at a time to shorten the code:\n *\n *\t\tbutton.bind( 'isEnabled', 'value' ).to( command );\n *\n * which corresponds to:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command );\n *\t\tbutton.bind( 'value' ).to( command );\n *\n * The binding can include more than one observable, combining multiple data sources in a custom callback:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',\n *\t\t\t( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );\n *\n * It is also possible to bind to the same property in an array of observables.\n * To bind a `button` to multiple commands (also `Observables`) so that each and every one of them\n * must be enabled for the button to become enabled, use the following code:\n *\n *\t\tbutton.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',\n *\t\t\t( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );\n *\n * @method #bind\n * @param {...String} bindProperties Observable properties that will be bound to another observable(s).\n * @returns {Object} The bind chain with the `to()` and `toMany()` methods.\n */\n\n/**\n * Removes the binding created with {@link #bind}.\n *\n *\t\t// Removes the binding for the 'a' property.\n *\t\tA.unbind( 'a' );\n *\n *\t\t// Removes bindings for all properties.\n *\t\tA.unbind();\n *\n * @method #unbind\n * @param {...String} [unbindProperties] Observable properties to be unbound. All the bindings will\n * be released if no properties provided.\n */\n\n/**\n * Turns the given methods of this object into event-based ones. This means that the new method will fire an event\n * (named after the method) and the original action will be plugged as a listener to that event.\n *\n * Read more in the {@glink framework/guides/deep-dive/observables#decorating-object-methods dedicated guide}\n * covering the topic of decorating methods with some additional examples.\n *\n * Decorating the method does not change its behavior (it only adds an event),\n * but it allows to modify it later on by listening to the method's event.\n *\n * For example, to cancel the method execution the event can be {@link module:utils/eventinfo~EventInfo#stop stopped}:\n *\n *\t\tclass Foo {\n *\t\t\tconstructor() {\n *\t\t\t\tthis.decorate( 'method' );\n *\t\t\t}\n *\n *\t\t\tmethod() {\n *\t\t\t\tconsole.log( 'called!' );\n *\t\t\t}\n *\t\t}\n *\n *\t\tconst foo = new Foo();\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.stop();\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method(); // Nothing is logged.\n *\n *\n * **Note**: The high {@link module:utils/priorities~PriorityString priority} listener\n * has been used to execute this particular callback before the one which calls the original method\n * (which uses the \"normal\" priority).\n *\n * It is also possible to change the returned value:\n *\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.return = 'Foo!';\n *\t\t} );\n *\n *\t\tfoo.method(); // -> 'Foo'\n *\n * Finally, it is possible to access and modify the arguments the method is called with:\n *\n *\t\tmethod( a, b ) {\n *\t\t\tconsole.log( `${ a }, ${ b }` );\n *\t\t}\n *\n *\t\t// ...\n *\n *\t\tfoo.on( 'method', ( evt, args ) => {\n *\t\t\targs[ 0 ] = 3;\n *\n *\t\t\tconsole.log( args[ 1 ] ); // -> 2\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method( 1, 2 ); // -> '3, 2'\n *\n * @method #decorate\n * @param {String} methodName Name of the method to decorate.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/editableelement\n */\n\nimport ContainerElement from './containerelement';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\nconst documentSymbol = Symbol( 'document' );\n\n/**\n * Editable element which can be a {@link module:engine/view/rooteditableelement~RootEditableElement root}\n * or nested editable area in the editor.\n *\n * Editable is automatically read-only when its {@link module:engine/view/document~Document Document} is read-only.\n *\n * The constructor of this class shouldn't be used directly. To create new `EditableElement` use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createEditableElement `downcastWriter#createEditableElement()`} method.\n *\n * @extends module:engine/view/containerelement~ContainerElement\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class EditableElement extends ContainerElement {\n\t/**\n\t * Creates an editable element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createEditableElement\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Whether the editable is in read-write or read-only mode.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * Whether the editable is focused.\n\t\t *\n\t\t * This property updates when {@link module:engine/view/document~Document#isFocused document.isFocused} or view\n\t\t * selection is changed.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * The {@link module:engine/view/document~Document} which is an owner of this root.\n\t\t * Can only by set once.\n\t\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-editableelement-document-already-set`\n\t\t * when document is already set.\n\t\t *\n\t\t * @member {module:engine/view/document~Document} #document\n\t\t */\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'editableElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'editableElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Returns document associated with the editable.\n\t *\n\t * @readonly\n\t * @returns {module:engine/view/document~Document}\n\t */\n\tget document() {\n\t\treturn this.getCustomProperty( documentSymbol );\n\t}\n\n\t/**\n\t * Sets document of this editable element.\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document\n\t */\n\tset _document( document ) {\n\t\tif ( this.getCustomProperty( documentSymbol ) ) {\n\t\t\t/**\n\t\t\t * View document is already set. It can only be set once.\n\t\t\t *\n\t\t\t * @error view-editableelement-document-already-set\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-editableelement-document-already-set: View document is already set.' );\n\t\t}\n\n\t\tthis._setCustomProperty( documentSymbol, document );\n\n\t\tthis.bind( 'isReadOnly' ).to( document );\n\n\t\tthis.bind( 'isFocused' ).to(\n\t\t\tdocument,\n\t\t\t'isFocused',\n\t\t\tisFocused => isFocused && document.selection.editableElement == this\n\t\t);\n\n\t\t// Update focus state based on selection changes.\n\t\tthis.listenTo( document.selection, 'change', () => {\n\t\t\tthis.isFocused = document.isFocused && document.selection.editableElement == this;\n\t\t} );\n\t}\n}\n\nmix( EditableElement, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/rooteditableelement\n */\n\nimport EditableElement from './editableelement';\n\nconst rootNameSymbol = Symbol( 'rootName' );\n\n/**\n * Class representing a single root in the data view. A root can be either {@link ~RootEditableElement#isReadOnly editable or read-only},\n * but in both cases it is called \"an editable\". Roots can contain other {@link module:engine/view/editableelement~EditableElement\n * editable elements} making them \"nested editables\".\n *\n * @extends module:engine/view/editableelement~EditableElement\n */\nexport default class RootEditableElement extends EditableElement {\n\t/**\n\t * Creates root editable element.\n\t *\n\t * @param {String} name Node name.\n\t */\n\tconstructor( name ) {\n\t\tsuper( name );\n\n\t\t/**\n\t\t * Name of this root inside {@link module:engine/view/document~Document} that is an owner of this root. If no\n\t\t * other name is set, `main` name is used.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.rootName = 'main';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'rootElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'rootElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\tget rootName() {\n\t\treturn this.getCustomProperty( rootNameSymbol );\n\t}\n\n\tset rootName( rootName ) {\n\t\tthis._setCustomProperty( rootNameSymbol, rootName );\n\t}\n\n\t/**\n\t * Overrides old element name and sets new one.\n\t * This is needed because view roots are created before they are attached to the DOM.\n\t * The name of the root element is temporary at this stage. It has to be changed when the\n\t * view root element is attached to the DOM element.\n\t *\n\t * @protected\n\t * @param {String} name The new name of element.\n\t */\n\tset _name( name ) {\n\t\tthis.name = name;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/treewalker\n */\n\nimport Element from './element';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport Position from './position';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Position iterator class. It allows to iterate forward and backward over the document.\n */\nexport default class TreeWalker {\n\t/**\n\t * Creates a range iterator. All parameters are optional, but you have to specify either `boundaries` or `startPosition`.\n\t *\n\t * @constructor\n\t * @param {Object} options Object with configuration.\n\t * @param {module:engine/view/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {module:engine/view/position~Position} [options.startPosition] Starting position.\n\t * @param {'forward'|'backward'} [options.direction='forward'] Walking direction.\n\t * @param {Boolean} [options.singleCharacters=false] Flag indicating whether all characters from\n\t * {@link module:engine/view/text~Text} should be returned as one {@link module:engine/view/text~Text} (`false`) ore one by one as\n\t * {@link module:engine/view/textproxy~TextProxy} (`true`).\n\t * @param {Boolean} [options.shallow=false] Flag indicating whether iterator should enter elements or not. If the\n\t * iterator is shallow child nodes of any iterated node will not be returned along with `elementEnd` tag.\n\t * @param {Boolean} [options.ignoreElementEnd=false] Flag indicating whether iterator should ignore `elementEnd`\n\t * tags. If the option is true walker will not return a parent node of start position. If this option is `true`\n\t * each {@link module:engine/view/element~Element} will be returned once, while if the option is `false` they might be returned\n\t * twice: for `'elementStart'` and `'elementEnd'`.\n\t */\n\tconstructor( options = {} ) {\n\t\tif ( !options.boundaries && !options.startPosition ) {\n\t\t\t/**\n\t\t\t * Neither boundaries nor starting position have been defined.\n\t\t\t *\n\t\t\t * @error view-tree-walker-no-start-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-tree-walker-no-start-position: Neither boundaries nor starting position have been defined.' );\n\t\t}\n\n\t\tif ( options.direction && options.direction != 'forward' && options.direction != 'backward' ) {\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-tree-walker-unknown-direction: Only `backward` and `forward` direction allowed.',\n\t\t\t\t{ direction: options.direction }\n\t\t\t);\n\t\t}\n\n\t\t/**\n\t\t * Iterator boundaries.\n\t\t *\n\t\t * When the iterator is walking `'forward'` on the end of boundary or is walking `'backward'`\n\t\t * on the start of boundary, then `{ done: true }` is returned.\n\t\t *\n\t\t * If boundaries are not defined they are set before first and after last child of the root node.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/range~Range} module:engine/view/treewalker~TreeWalker#boundaries\n\t\t */\n\t\tthis.boundaries = options.boundaries || null;\n\n\t\t/**\n\t\t * Iterator position. If start position is not defined then position depends on {@link #direction}. If direction is\n\t\t * `'forward'` position starts form the beginning, when direction is `'backward'` position starts from the end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position} module:engine/view/treewalker~TreeWalker#position\n\t\t */\n\t\tif ( options.startPosition ) {\n\t\t\tthis.position = Position._createAt( options.startPosition );\n\t\t} else {\n\t\t\tthis.position = Position._createAt( options.boundaries[ options.direction == 'backward' ? 'end' : 'start' ] );\n\t\t}\n\n\t\t/**\n\t\t * Walking direction. Defaults `'forward'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'backward'|'forward'} module:engine/view/treewalker~TreeWalker#direction\n\t\t */\n\t\tthis.direction = options.direction || 'forward';\n\n\t\t/**\n\t\t * Flag indicating whether all characters from {@link module:engine/view/text~Text} should be returned as one\n\t\t * {@link module:engine/view/text~Text} or one by one as {@link module:engine/view/textproxy~TextProxy}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#singleCharacters\n\t\t */\n\t\tthis.singleCharacters = !!options.singleCharacters;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should enter elements or not. If the iterator is shallow child nodes of any\n\t\t * iterated node will not be returned along with `elementEnd` tag.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#shallow\n\t\t */\n\t\tthis.shallow = !!options.shallow;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should ignore `elementEnd` tags. If set to `true`, walker will not\n\t\t * return a parent node of the start position. Each {@link module:engine/view/element~Element} will be returned once.\n\t\t * When set to `false` each element might be returned twice: for `'elementStart'` and `'elementEnd'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#ignoreElementEnd\n\t\t */\n\t\tthis.ignoreElementEnd = !!options.ignoreElementEnd;\n\n\t\t/**\n\t\t * Start boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryStartParent\n\t\t */\n\t\tthis._boundaryStartParent = this.boundaries ? this.boundaries.start.parent : null;\n\n\t\t/**\n\t\t * End boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryEndParent\n\t\t */\n\t\tthis._boundaryEndParent = this.boundaries ? this.boundaries.end.parent : null;\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves {@link #position} in the {@link #direction} skipping values as long as the callback function returns `true`.\n\t *\n\t * For example:\n\t *\n\t * \t\twalker.skip( value => value.type == 'text' ); //

{}foo

->

foo[]

\n\t * \t\twalker.skip( value => true ); // Move the position to the end:

{}foo

->

foo

[]\n\t * \t\twalker.skip( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t */\n\tskip( skip ) {\n\t\tlet done, value, prevPosition;\n\n\t\tdo {\n\t\t\tprevPosition = this.position;\n\n\t\t\t( { done, value } = this.next() );\n\t\t} while ( !done && skip( value ) );\n\n\t\tif ( !done ) {\n\t\t\tthis.position = prevPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the next tree walker's value.\n\t *\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} Object implementing iterator interface, returning\n\t * information about taken step.\n\t */\n\tnext() {\n\t\tif ( this.direction == 'forward' ) {\n\t\t\treturn this._next();\n\t\t} else {\n\t\t\treturn this._previous();\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step forward in view. Moves the {@link #position} to the next position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done `true` if iterator is done, `false` otherwise.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_next() {\n\t\tlet position = this.position.clone();\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the end of the root.\n\t\tif ( parent.parent === null && position.offset === parent.childCount ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent === this._boundaryEndParent && position.offset == this.boundaries.end.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just after current position.\n\t\tlet node;\n\n\t\t// Text is a specific parent because it contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtEnd ) {\n\t\t\t\t// Prevent returning \"elementEnd\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position._createAfter( parent );\n\n\t\t\t\treturn this._next();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t} else {\n\t\t\t\tposition.offset++;\n\t\t\t}\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap by TextProxy.\n\t\t\t\tif ( node == this._boundaryEndParent ) {\n\t\t\t\t\tcharactersCount = this.boundaries.end.offset;\n\t\t\t\t\titem = new TextProxy( node, 0, charactersCount );\n\t\t\t\t\tposition = Position._createAfter( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving forward.\n\t\t\t\t\tposition.offset++;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\ttextLength = 1;\n\t\t\t} else {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst endOffset = parent === this._boundaryEndParent ? this.boundaries.end.offset : parent.data.length;\n\n\t\t\t\ttextLength = endOffset - position.offset;\n\t\t\t}\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tposition.offset += textLength;\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the end of current `parent`.\n\t\t\tposition = Position._createAfter( parent );\n\t\t\tthis.position = position;\n\n\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\treturn this._formatReturnValue( 'elementEnd', parent, previousPosition, position );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step backward in view. Moves the {@link #position} to the previous position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_previous() {\n\t\tlet position = this.position.clone();\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the beginning of the root.\n\t\tif ( parent.parent === null && position.offset === 0 ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent == this._boundaryStartParent && position.offset == this.boundaries.start.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just before current position.\n\t\tlet node;\n\n\t\t// Text {@link module:engine/view/text~Text} element is a specific parent because contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtStart ) {\n\t\t\t\t// Prevent returning \"elementStart\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position._createBefore( parent );\n\n\t\t\t\treturn this._previous();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset - 1 ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset - 1 );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, node.childCount );\n\t\t\t\tthis.position = position;\n\n\t\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\t\treturn this._previous();\n\t\t\t\t} else {\n\t\t\t\t\treturn this._formatReturnValue( 'elementEnd', node, previousPosition, position );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tposition.offset--;\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t\t}\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, node.data.length );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._previous();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap by TextProxy.\n\t\t\t\tif ( node == this._boundaryStartParent ) {\n\t\t\t\t\tconst offset = this.boundaries.start.offset;\n\n\t\t\t\t\titem = new TextProxy( node, offset, node.data.length - offset );\n\t\t\t\t\tcharactersCount = item.data.length;\n\t\t\t\t\tposition = Position._createBefore( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving backward.\n\t\t\t\t\tposition.offset--;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( !this.singleCharacters ) {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst startOffset = parent === this._boundaryStartParent ? this.boundaries.start.offset : 0;\n\n\t\t\t\ttextLength = position.offset - startOffset;\n\t\t\t} else {\n\t\t\t\ttextLength = 1;\n\t\t\t}\n\n\t\t\tposition.offset -= textLength;\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the beginning of current `parent`.\n\t\t\tposition = Position._createBefore( parent );\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', parent, previousPosition, position, 1 );\n\t\t}\n\t}\n\n\t/**\n\t * Format returned data and adjust `previousPosition` and `nextPosition` if reach the bound of the {@link module:engine/view/text~Text}.\n\t *\n\t * @private\n\t * @param {module:engine/view/treewalker~TreeWalkerValueType} type Type of step.\n\t * @param {module:engine/view/item~Item} item Item between old and new position.\n\t * @param {module:engine/view/position~Position} previousPosition Previous position of iterator.\n\t * @param {module:engine/view/position~Position} nextPosition Next position of iterator.\n\t * @param {Number} [length] Length of the item.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue}\n\t */\n\t_formatReturnValue( type, item, previousPosition, nextPosition, length ) {\n\t\t// Text is a specific parent, because contains string instead of children.\n\t\t// Walker doesn't enter to the Text except situations when walker is iterating over every single character,\n\t\t// or the bound starts/ends inside the Text. So when the position is at the beginning or at the end of the Text\n\t\t// we move it just before or just after Text.\n\t\tif ( item instanceof TextProxy ) {\n\t\t\t// Position is at the end of Text.\n\t\t\tif ( item.offsetInText + item.data.length == item.textNode.data.length ) {\n\t\t\t\tif ( this.direction == 'forward' && !( this.boundaries && this.boundaries.end.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position._createAfter( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position._createAfter( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Position is at the begining ot the text.\n\t\t\tif ( item.offsetInText === 0 ) {\n\t\t\t\tif ( this.direction == 'backward' && !( this.boundaries && this.boundaries.start.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position._createBefore( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position._createBefore( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tdone: false,\n\t\t\tvalue: {\n\t\t\t\ttype,\n\t\t\t\titem,\n\t\t\t\tpreviousPosition,\n\t\t\t\tnextPosition,\n\t\t\t\tlength\n\t\t\t}\n\t\t};\n\t}\n}\n\n/**\n * Type of the step made by {@link module:engine/view/treewalker~TreeWalker}.\n * Possible values: `'elementStart'` if walker is at the beginning of a node, `'elementEnd'` if walker is at the end\n * of node, or `'text'` if walker traversed over single and multiple characters.\n * For {@link module:engine/view/text~Text} `elementStart` and `elementEnd` is not returned.\n *\n * @typedef {String} module:engine/view/treewalker~TreeWalkerValueType\n */\n\n/**\n * Object returned by {@link module:engine/view/treewalker~TreeWalker} when traversing tree view.\n *\n * @typedef {Object} module:engine/view/treewalker~TreeWalkerValue\n * @property {module:engine/view/treewalker~TreeWalkerValueType} type\n * @property {module:engine/view/item~Item} item Item between the old and the new positions\n * of the tree walker.\n * @property {module:engine/view/position~Position} previousPosition Previous position of the iterator.\n * * Forward iteration: For `'elementEnd'` it is the last position inside the element. For all other types it is the\n * position before the item.\n * * Backward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the text to its parent just before or just after that text.\n * @property {module:engine/view/position~Position} nextPosition Next position of the iterator.\n * * Forward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after the item.\n * * Backward iteration: For `'elementEnd'` it is last position inside element. For all other types it is the position\n * before the item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the text to its parent just before or just after that text.\n * @property {Number} [length] Length of the item. For `'elementStart'` it is `1`. For `'text'` it is\n * the length of that text. For `'elementEnd'` it is `undefined`.\n */\n\n/**\n * Tree walking directions.\n *\n * @typedef {'forward'|'backward'} module:engine/view/treewalker~TreeWalkerDirection\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/position\n */\n\nimport TreeWalker from './treewalker';\n\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EditableElement from './editableelement';\n\n/**\n * Position in the view tree. Position is represented by its parent node and an offset in this parent.\n *\n * In order to create a new position instance use the `createPosition*()` factory methods available in:\n *\n * * {@module:engine/view/view~View}\n * * {@module:engine/view/downcastwriter~DowncastWriter}\n * * {@module:engine/view/upcastwriter~UpcastWriter}\n */\nexport default class Position {\n\t/**\n\t * Creates a position.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} parent Position parent.\n\t * @param {Number} offset Position offset.\n\t */\n\tconstructor( parent, offset ) {\n\t\t/**\n\t\t * Position parent.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t\t * module:engine/view/position~Position#parent\n\t\t */\n\t\tthis.parent = parent;\n\n\t\t/**\n\t\t * Position offset.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/position~Position#offset\n\t\t */\n\t\tthis.offset = offset;\n\t}\n\n\t/**\n\t * Node directly after the position. Equals `null` when there is no node after position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeAfter() {\n\t\tif ( this.parent.is( 'text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset ) || null;\n\t}\n\n\t/**\n\t * Node directly before the position. Equals `null` when there is no node before position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeBefore() {\n\t\tif ( this.parent.is( 'text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset - 1 ) || null;\n\t}\n\n\t/**\n\t * Is `true` if position is at the beginning of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtStart() {\n\t\treturn this.offset === 0;\n\t}\n\n\t/**\n\t * Is `true` if position is at the end of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtEnd() {\n\t\tconst endOffset = this.parent.is( 'text' ) ? this.parent.data.length : this.parent.childCount;\n\n\t\treturn this.offset === endOffset;\n\t}\n\n\t/**\n\t * Position's root, that is the root of the position's parent element.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.parent.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this position, or `null` if\n\t * position is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tlet editable = this.parent;\n\n\t\twhile ( !( editable instanceof EditableElement ) ) {\n\t\t\tif ( editable.parent ) {\n\t\t\t\teditable = editable.parent;\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t}\n\n\t\treturn editable;\n\t}\n\n\t/**\n\t * Returns a new instance of Position with offset incremented by `shift` value.\n\t *\n\t * @param {Number} shift How position offset should get changed. Accepts negative values.\n\t * @returns {module:engine/view/position~Position} Shifted position.\n\t */\n\tgetShiftedBy( shift ) {\n\t\tconst shifted = Position._createAt( this );\n\n\t\tconst offset = shifted.offset + shift;\n\t\tshifted.offset = offset < 0 ? 0 : offset;\n\n\t\treturn shifted;\n\t}\n\n\t/**\n\t * Gets the farthest position which matches the callback using\n\t * {@link module:engine/view/treewalker~TreeWalker TreeWalker}.\n\t *\n\t * For example:\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text' ); //

{}foo

->

foo[]

\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text', { direction: 'backward' } ); //

foo[]

->

{}foo

\n\t * \t\tgetLastMatchingPosition( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t *\n\t * @returns {module:engine/view/position~Position} The position after the last item which matches the `skip` callback test.\n\t */\n\tgetLastMatchingPosition( skip, options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\t\ttreeWalker.skip( skip );\n\n\t\treturn treeWalker.position;\n\t}\n\n\t/**\n\t * Returns ancestors array of this position, that is this position's parent and it's ancestors.\n\t *\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors() {\n\t\tif ( this.parent.is( 'documentFragment' ) ) {\n\t\t\treturn [ this.parent ];\n\t\t} else {\n\t\t\treturn this.parent.getAncestors( { includeSelf: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both positions.\n\t *\n\t * @param {module:engine/view/position~Position} position\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( position ) {\n\t\tconst ancestorsA = this.getAncestors();\n\t\tconst ancestorsB = position.getAncestors();\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Checks whether this position equals given position.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions are same.\n\t */\n\tisEqual( otherPosition ) {\n\t\treturn ( this.parent == otherPosition.parent && this.offset == otherPosition.offset );\n\t}\n\n\t/**\n\t * Checks whether this position is located before given position. When method returns `false` it does not mean that\n\t * this position is after give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isAfter\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is before given position.\n\t */\n\tisBefore( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'before';\n\t}\n\n\t/**\n\t * Checks whether this position is located after given position. When method returns `false` it does not mean that\n\t * this position is before give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isBefore\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is after given position.\n\t */\n\tisAfter( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'after';\n\t}\n\n\t/**\n\t * Checks whether this position is before, after or in same position that other position. Two positions may be also\n\t * different when they are located in separate roots.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {module:engine/view/position~PositionRelation}\n\t */\n\tcompareWith( otherPosition ) {\n\t\tif ( this.root !== otherPosition.root ) {\n\t\t\treturn 'different';\n\t\t}\n\n\t\tif ( this.isEqual( otherPosition ) ) {\n\t\t\treturn 'same';\n\t\t}\n\n\t\t// Get path from root to position's parent element.\n\t\tconst thisPath = this.parent.is( 'node' ) ? this.parent.getPath() : [];\n\t\tconst otherPath = otherPosition.parent.is( 'node' ) ? otherPosition.parent.getPath() : [];\n\n\t\t// Add the positions' offsets to the parents offsets.\n\t\tthisPath.push( this.offset );\n\t\totherPath.push( otherPosition.offset );\n\n\t\t// Compare both path arrays to find common ancestor.\n\t\tconst result = compareArrays( thisPath, otherPath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn 'before';\n\n\t\t\tcase 'extension':\n\t\t\t\treturn 'after';\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < otherPath[ result ] ? 'before' : 'after';\n\t\t}\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/view/treewalker~TreeWalker TreeWalker} instance with this positions as a start position.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}\n\t * @param {module:engine/view/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\tclone() {\n\t\treturn new Position( this.parent, this.offset );\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link module:engine/view/position~Position._createBefore},\n\t * * {@link module:engine/view/position~Position._createAfter}.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tstatic _createAt( itemOrPosition, offset ) {\n\t\tif ( itemOrPosition instanceof Position ) {\n\t\t\treturn new this( itemOrPosition.parent, itemOrPosition.offset );\n\t\t} else {\n\t\t\tconst node = itemOrPosition;\n\n\t\t\tif ( offset == 'end' ) {\n\t\t\t\toffset = node.is( 'text' ) ? node.data.length : node.childCount;\n\t\t\t} else if ( offset == 'before' ) {\n\t\t\t\treturn this._createBefore( node );\n\t\t\t} else if ( offset == 'after' ) {\n\t\t\t\treturn this._createAfter( node );\n\t\t\t} else if ( offset !== 0 && !offset ) {\n\t\t\t\t/**\n\t\t\t\t * {@link module:engine/view/view~View#createPositionAt `View#createPositionAt()`}\n\t\t\t\t * requires the offset to be specified when the first parameter is a view item.\n\t\t\t\t *\n\t\t\t\t * @error view-createPositionAt-offset-required\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-createPositionAt-offset-required: ' +\n\t\t\t\t\t'View#createPositionAt() requires the offset when the first parameter is a view item.' );\n\t\t\t}\n\n\t\t\treturn new Position( node, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic _createAfter( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText + item.data.length );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position after a root.\n\t\t\t *\n\t\t\t * @error view-position-after-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-after-root: You can not make position after root.', { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index + 1 );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic _createBefore( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You cannot make a position before a root.\n\t\t\t *\n\t\t\t * @error view-position-before-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-before-root: You can not make position before root.', { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index );\n\t}\n}\n\n/**\n * A flag indicating whether this position is `'before'` or `'after'` or `'same'` as given position.\n * If positions are in different roots `'different'` flag is returned.\n *\n * @typedef {String} module:engine/view/position~PositionRelation\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/range\n */\n\nimport Position from './position';\nimport TreeWalker from './treewalker';\n\n/**\n * Range in the view tree. A range is represented by its start and end {@link module:engine/view/position~Position positions}.\n *\n * In order to create a new position instance use the `createPosition*()` factory methods available in:\n *\n * * {@module:engine/view/view~View}\n * * {@module:engine/view/downcastwriter~DowncastWriter}\n * * {@module:engine/view/upcastwriter~UpcastWriter}\n */\nexport default class Range {\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** Constructor creates it's own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at the `start` position.\n\t */\n\tconstructor( start, end = null ) {\n\t\t/**\n\t\t * Start position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.start = start.clone();\n\n\t\t/**\n\t\t * End position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.end = end ? end.clone() : start.clone();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them together with additional information like length or {@link module:engine/view/position~Position positions},\n\t * grouped as {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * This iterator uses {@link module:engine/view/treewalker~TreeWalker TreeWalker} with `boundaries` set to this range and\n\t * `ignoreElementEnd` option\n\t * set to `true`.\n\t *\n\t * @returns {Iterable.}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tyield* new TreeWalker( { boundaries: this, ignoreElementEnd: true } );\n\t}\n\n\t/**\n\t * Returns whether the range is collapsed, that is it start and end positions are equal.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.start.isEqual( this.end );\n\t}\n\n\t/**\n\t * Returns whether this range is flat, that is if {@link module:engine/view/range~Range#start start} position and\n\t * {@link module:engine/view/range~Range#end end} position are in the same {@link module:engine/view/position~Position#parent parent}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isFlat() {\n\t\treturn this.start.parent === this.end.parent;\n\t}\n\n\t/**\n\t * Range root element.\n\t *\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.start.root;\n\t}\n\n\t/**\n\t * Creates a maximal range that has the same content as this range but is expanded in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t *\t\t

Foo

{Bar}

->

Foo

[

Bar]

\n\t *\t\t

foo{bar}

->

foo[bar]

\n\t *\n\t * Note that in the sample above:\n\t *\n\t * - `

` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t * - `` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t * - `` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Enlarged range.\n\t */\n\tgetEnlarged() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\t// Fix positions, in case if they are in Text node.\n\t\tif ( start.parent.is( 'text' ) && start.isAtStart ) {\n\t\t\tstart = Position._createBefore( start.parent );\n\t\t}\n\n\t\tif ( end.parent.is( 'text' ) && end.isAtEnd ) {\n\t\t\tend = Position._createAfter( end.parent );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a minimum range that has the same content as this range but is trimmed in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t *\t\t

Foo

[

Bar]

->

Foo

{Bar}

\n\t *\t\t

foo[bar]

->

foo{bar}

\n\t *\n\t * Note that in the sample above:\n\t *\n\t * - `

` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t * - `` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t * - `` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Shrink range.\n\t */\n\tgetTrimmed() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\tif ( start.isAfter( this.end ) || start.isEqual( this.end ) ) {\n\t\t\treturn new Range( start, start );\n\t\t}\n\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tconst nodeAfterStart = start.nodeAfter;\n\t\tconst nodeBeforeEnd = end.nodeBefore;\n\n\t\t// Because TreeWalker prefers positions next to text node, we need to move them manually into these text nodes.\n\t\tif ( nodeAfterStart && nodeAfterStart.is( 'text' ) ) {\n\t\t\tstart = new Position( nodeAfterStart, 0 );\n\t\t}\n\n\t\tif ( nodeBeforeEnd && nodeBeforeEnd.is( 'text' ) ) {\n\t\t\tend = new Position( nodeBeforeEnd, nodeBeforeEnd.data.length );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Two ranges are equal if their start and end positions are equal.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges are equal, `false` otherwise\n\t */\n\tisEqual( otherRange ) {\n\t\treturn this == otherRange || ( this.start.isEqual( otherRange.start ) && this.end.isEqual( otherRange.end ) );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/position~Position position}.\n\t *\n\t * @param {module:engine/view/position~Position} position Position to check.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/position~Position position} is contained in this range,\n\t * `false` otherwise.\n\t */\n\tcontainsPosition( position ) {\n\t\treturn position.isAfter( this.start ) && position.isBefore( this.end );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/range~Range range}.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check.\n\t * @param {Boolean} [loose=false] Whether the check is loose or strict. If the check is strict (`false`), compared range cannot\n\t * start or end at the same position as this range boundaries. If the check is loose (`true`), compared range can start, end or\n\t * even be equal to this range. Note that collapsed ranges are always compared in strict mode.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/range~Range range} boundaries are contained by this range, `false`\n\t * otherwise.\n\t */\n\tcontainsRange( otherRange, loose = false ) {\n\t\tif ( otherRange.isCollapsed ) {\n\t\t\tloose = false;\n\t\t}\n\n\t\tconst containsStart = this.containsPosition( otherRange.start ) || ( loose && this.start.isEqual( otherRange.start ) );\n\t\tconst containsEnd = this.containsPosition( otherRange.end ) || ( loose && this.end.isEqual( otherRange.end ) );\n\n\t\treturn containsStart && containsEnd;\n\t}\n\n\t/**\n\t * Computes which part(s) of this {@link module:engine/view/range~Range range} is not a part of given\n\t * {@link module:engine/view/range~Range range}.\n\t * Returned array contains zero, one or two {@link module:engine/view/range~Range ranges}.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = downcastWriter.createText( 'foo' );\n\t *\t\tlet img = downcastWriter.createContainerElement( 'img' );\n\t *\t\tlet bar = downcastWriter.createText( 'bar' );\n\t *\t\tlet p = downcastWriter.createContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = view.createRange( view.createPositionAt( foo, 2 ), view.createPositionAt( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = view.createRange( // \"oo\", img, \"ba\" are in range.\n\t *\t\t\tview.createPositionAt( foo, 1 ),\n\t *\t\t\tview.createPositionAt( bar, 2 )\n\t *\t\t);\n\t *\t\tlet transformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has no ranges because `otherRange` contains `range`\n\t *\n\t *\t\totherRange = view.createRange( view.createPositionAt( foo, 1 ), view.createPositionAt( p, 2 ); // \"oo\", img are in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has one range: from ( p, 2 ) to ( bar, 1 )\n\t *\n\t *\t\totherRange = view.createRange( view.createPositionAt( p, 1 ), view.createPositionAt( p, 2 ) ); // img is in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has two ranges: from ( foo, 1 ) to ( p, 1 ) and from ( p, 2 ) to ( bar, 1 )\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to differentiate against.\n\t * @returns {Array.} The difference between ranges.\n\t */\n\tgetDifference( otherRange ) {\n\t\tconst ranges = [];\n\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect.\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the start to the middle of this range.\n\t\t\t\tranges.push( new Range( this.start, otherRange.start ) );\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the middle of this range to the end.\n\t\t\t\tranges.push( new Range( otherRange.end, this.end ) );\n\t\t\t}\n\t\t} else {\n\t\t\t// Ranges do not intersect, return the original range.\n\t\t\tranges.push( this.clone() );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an intersection of this {@link module:engine/view/range~Range range} and given {@link module:engine/view/range~Range range}.\n\t * Intersection is a common part of both of those ranges. If ranges has no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = downcastWriter.createText( 'foo' );\n\t *\t\tlet img = downcastWriter.createContainerElement( 'img' );\n\t *\t\tlet bar = downcastWriter.createText( 'bar' );\n\t *\t\tlet p = downcastWriter.createContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = view.createRange( view.createPositionAt( foo, 2 ), view.createPositionAt( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = view.createRange( view.createPositionAt( foo, 1 ), view.createPositionAt( p, 2 ); // \"oo\", img are in range.\n\t *\t\tlet transformed = range.getIntersection( otherRange ); // range from ( foo, 1 ) to ( p, 2 ).\n\t *\n\t *\t\totherRange = view.createRange( view.createPositionAt( bar, 1 ), view.createPositionAt( bar, 3 ); \"ar\" is in range.\n\t *\t\ttransformed = range.getIntersection( otherRange ); // null - no common part.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check for intersection.\n\t * @returns {module:engine/view/range~Range|null} A common part of given ranges or `null` if ranges have no common part.\n\t */\n\tgetIntersection( otherRange ) {\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect, so a common range will be returned.\n\t\t\t// At most, it will be same as this range.\n\t\t\tlet commonRangeStart = this.start;\n\t\t\tlet commonRangeEnd = this.end;\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means thaNt we have to\n\t\t\t\t// shrink common range to the given range start.\n\t\t\t\tcommonRangeStart = otherRange.start;\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// shrink common range to the given range end.\n\t\t\t\tcommonRangeEnd = otherRange.end;\n\t\t\t}\n\n\t\t\treturn new Range( commonRangeStart, commonRangeEnd );\n\t\t}\n\n\t\t// Ranges do not intersect, so they do not have common part.\n\t\treturn null;\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/view/treewalker~TreeWalker TreeWalker} instance with this range as a boundary.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @param {module:engine/view/position~Position} [options.startPosition]\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t * @returns {module:engine/view/treewalker~TreeWalker}\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of range's both ends (in which the entire range is contained).\n\t *\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor() {\n\t\treturn this.start.getCommonAncestor( this.end );\n\t}\n\n\t/**\n\t * Clones this range.\n\t *\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tclone() {\n\t\treturn new Range( this.start, this.end );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range and `ignoreElementEnd` option\n\t * set to `true`. However it returns only {@link module:engine/view/item~Item items},\n\t * not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.}\n\t */\n\t* getItems( options = {} ) {\n\t\toptions.boundaries = this;\n\t\toptions.ignoreElementEnd = true;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/position~Position positions} that are boundaries or\n\t * contained in this range.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range. However it returns only\n\t * {@link module:engine/view/position~Position positions}, not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.}\n\t */\n\t* getPositions( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tyield treeWalker.position;\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.nextPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Checks and returns whether this range intersects with the given range.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} True if ranges intersect.\n\t */\n\tisIntersecting( otherRange ) {\n\t\treturn this.start.isBefore( otherRange.end ) && this.end.isAfter( otherRange.start );\n\t}\n\n\t/**\n\t * Creates a range from the given parents and offsets.\n\t *\n\t * @protected\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} startElement Start position\n\t * parent element.\n\t * @param {Number} startOffset Start position offset.\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} endElement End position\n\t * parent element.\n\t * @param {Number} endOffset End position offset.\n\t * @returns {module:engine/view/range~Range} Created range.\n\t */\n\tstatic _createFromParentsAndOffsets( startElement, startOffset, endElement, endOffset ) {\n\t\treturn new this(\n\t\t\tnew Position( startElement, startOffset ),\n\t\t\tnew Position( endElement, endOffset )\n\t\t);\n\t}\n\n\t/**\n\t * Creates a new range, spreading from specified {@link module:engine/view/position~Position position} to a position moved by\n\t * given `shift`. If `shift` is a negative value, shifted position is treated as the beginning of the range.\n\t *\n\t * @protected\n\t * @param {module:engine/view/position~Position} position Beginning of the range.\n\t * @param {Number} shift How long the range should be.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic _createFromPositionAndShift( position, shift ) {\n\t\tconst start = position;\n\t\tconst end = position.getShiftedBy( shift );\n\n\t\treturn shift > 0 ? new this( start, end ) : new this( end, start );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @protected\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic _createIn( element ) {\n\t\treturn this._createFromParentsAndOffsets( element, 0, element, element.childCount );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic _createOn( item ) {\n\t\tconst size = item.is( 'textProxy' ) ? item.offsetSize : 1;\n\n\t\treturn this._createFromPositionAndShift( Position._createBefore( item ), size );\n\t}\n}\n\n// Function used by getEnlarged and getTrimmed methods.\nfunction enlargeTrimSkip( value ) {\n\tif ( value.item.is( 'attributeElement' ) || value.item.is( 'uiElement' ) ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/count\n */\n\n/**\n * Returns the number of items return by the iterator.\n *\n *\t\tcount( [ 1, 2, 3, 4, 5 ] ); // 5;\n *\n * @param {Iterable.<*>} iterator Any iterator.\n * @returns {Number} Number of items returned by that iterator.\n */\nexport default function count( iterator ) {\n\tlet count = 0;\n\n\tfor ( const _ of iterator ) { // eslint-disable-line no-unused-vars\n\t\tcount++;\n\t}\n\n\treturn count;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/selection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Range from './range';\nimport Position from './position';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport Node from './node';\nimport Element from './element';\nimport count from '@ckeditor/ckeditor5-utils/src/count';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport DocumentSelection from './documentselection';\n\n/**\n * Class representing an arbirtary selection in the view.\n * See also {@link module:engine/view/documentselection~DocumentSelection}.\n *\n * New selection instances can be created via the constructor or one these methods:\n *\n * * {@link module:engine/view/view~View#createSelection `View#createSelection()`},\n * * {@link module:engine/view/upcastwriter~UpcastWriter#createSelection `UpcastWriter#createSelection()`}.\n *\n * A selection can consist of {@link module:engine/view/range~Range ranges} that can be set by using\n * the {@link module:engine/view/selection~Selection#setTo `Selection#setTo()`} method.\n */\nexport default class Selection {\n\t/**\n\t * Creates new selection instance.\n\t *\n\t * **Note**: The selection constructor is available as a factory method:\n\t *\n\t * * {@link module:engine/view/view~View#createSelection `View#createSelection()`},\n\t * * {@link module:engine/view/upcastwriter~UpcastWriter#createSelection `UpcastWriter#createSelection()`}.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = writer.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = writer.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tconst selection = writer.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = writer.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = writer.createSelection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tconst selection = writer.createSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = writer.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = writer.createSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Stores all ranges that are selected.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.}\n\t\t */\n\t\tthis._ranges = [];\n\n\t\t/**\n\t\t * Specifies whether the last added range was added as a backward or forward range.\n\t\t *\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._lastRangeBackward = false;\n\n\t\t/**\n\t\t * Specifies whether selection instance is fake.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isFake = false;\n\n\t\t/**\n\t\t * Fake selection's label.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._fakeSelectionLabel = '';\n\n\t\tthis.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst anchor = this._lastRangeBackward ? range.end : range.start;\n\n\t\treturn anchor.clone();\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst focus = this._lastRangeBackward ? range.start : range.end;\n\n\t\treturn focus.clone();\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.rangeCount === 1 && this._ranges[ 0 ].isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._ranges.length;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn !this.isCollapsed && this._lastRangeBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tif ( this.anchor ) {\n\t\t\treturn this.anchor.editableElement;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.}\n\t */\n\t* getRanges() {\n\t\tfor ( const range of this._ranges ) {\n\t\t\tyield range.clone();\n\t\t}\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\tlet first = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !first || range.start.isBefore( first.start ) ) {\n\t\t\t\tfirst = range;\n\t\t\t}\n\t\t}\n\n\t\treturn first ? first.clone() : null;\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\tlet last = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !last || range.end.isAfter( last.end ) ) {\n\t\t\t\tlast = range;\n\t\t\t}\n\t\t}\n\n\t\treturn last ? last.clone() : null;\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\tconst firstRange = this.getFirstRange();\n\n\t\treturn firstRange ? firstRange.start.clone() : null;\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\tconst lastRange = this.getLastRange();\n\n\t\treturn lastRange ? lastRange.end.clone() : null;\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\tif ( this.isFake != otherSelection.isFake ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isFake && this.fakeSelectionLabel != otherSelection.fakeSelectionLabel ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.rangeCount != otherSelection.rangeCount ) {\n\t\t\treturn false;\n\t\t} else if ( this.rangeCount === 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const thisRange of this._ranges ) {\n\t\t\tlet found = false;\n\n\t\t\tfor ( const otherRange of otherSelection._ranges ) {\n\t\t\t\tif ( thisRange.isEqual( otherRange ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\tif ( this.isBackward != otherSelection.isBackward ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst numOfRangesA = count( this.getRanges() );\n\t\tconst numOfRangesB = count( otherSelection.getRanges() );\n\n\t\t// If selections have different number of ranges, they cannot be similar.\n\t\tif ( numOfRangesA != numOfRangesB ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If both selections have no ranges, they are similar.\n\t\tif ( numOfRangesA == 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check if each range in one selection has a similar range in other selection.\n\t\tfor ( let rangeA of this.getRanges() ) {\n\t\t\trangeA = rangeA.getTrimmed();\n\n\t\t\tlet found = false;\n\n\t\t\tfor ( let rangeB of otherSelection.getRanges() ) {\n\t\t\t\trangeB = rangeB.getTrimmed();\n\n\t\t\t\tif ( rangeA.start.isEqual( rangeB.start ) && rangeA.end.isEqual( rangeB.end ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// For `rangeA`, neither range in `otherSelection` was similar. So selections are not similar.\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// There were no ranges that weren't matched. Selections are similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\tif ( this.rangeCount !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst range = this.getFirstRange();\n\t\tconst nodeAfterStart = range.start.nodeAfter;\n\t\tconst nodeBeforeEnd = range.end.nodeBefore;\n\n\t\treturn ( nodeAfterStart instanceof Element && nodeAfterStart == nodeBeforeEnd ) ? nodeAfterStart : null;\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tselection.setTo( otherSelection );\n\t *\n\t *\t \t// Sets selection to contents of DocumentSelection.\n\t *\t\tselection.setTo( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionAt( root, path );\n\t *\t\tselection.setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tselection.setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tselection.setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tselection.setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tselection.setTo( null );\n\t *\n\t * `Selection#setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tselection.setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tselection.setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @fires change\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetTo( selectable, placeOrOffset, options ) {\n\t\tif ( selectable === null ) {\n\t\t\tthis._setRanges( [] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t\tthis._setFakeOptions( { fake: selectable.isFake, label: selectable.fakeSelectionLabel } );\n\t\t} else if ( selectable instanceof Range ) {\n\t\t\tthis._setRanges( [ selectable ], placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Position ) {\n\t\t\tthis._setRanges( [ new Range( selectable ) ] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Node ) {\n\t\t\tconst backward = !!options && !!options.backward;\n\t\t\tlet range;\n\n\t\t\tif ( placeOrOffset === undefined ) {\n\t\t\t\t/**\n\t\t\t\t * selection.setTo requires the second parameter when the first parameter is a node.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-setTo-required-second-parameter\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-setTo-required-second-parameter: ' +\n\t\t\t\t\t'selection.setTo requires the second parameter when the first parameter is a node.'\n\t\t\t\t);\n\t\t\t} else if ( placeOrOffset == 'in' ) {\n\t\t\t\trange = Range._createIn( selectable );\n\t\t\t} else if ( placeOrOffset == 'on' ) {\n\t\t\t\trange = Range._createOn( selectable );\n\t\t\t} else {\n\t\t\t\trange = new Range( Position._createAt( selectable, placeOrOffset ) );\n\t\t\t}\n\n\t\t\tthis._setRanges( [ range ], backward );\n\t\t\tthis._setFakeOptions( options );\n\t\t} else if ( isIterable( selectable ) ) {\n\t\t\t// We assume that the selectable is an iterable of ranges.\n\t\t\t// Array.from() is used to prevent setting ranges to the old iterable\n\t\t\tthis._setRanges( selectable, placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else {\n\t\t\t/**\n\t\t\t * Cannot set selection to given place.\n\t\t\t *\n\t\t\t * @error view-selection-setTo-not-selectable\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-selection-setTo-not-selectable: Cannot set selection to given place.' );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}\n\t * parameters.\n\t *\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetFocus( itemOrPosition, offset ) {\n\t\tif ( this.anchor === null ) {\n\t\t\t/**\n\t\t\t * Cannot set selection focus if there are no ranges in selection.\n\t\t\t *\n\t\t\t * @error view-selection-setFocus-no-ranges\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.'\n\t\t\t);\n\t\t}\n\n\t\tconst newFocus = Position._createAt( itemOrPosition, offset );\n\n\t\tif ( newFocus.compareWith( this.focus ) == 'same' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst anchor = this.anchor;\n\n\t\tthis._ranges.pop();\n\n\t\tif ( newFocus.compareWith( anchor ) == 'before' ) {\n\t\t\tthis._addRange( new Range( newFocus, anchor ), true );\n\t\t} else {\n\t\t\tthis._addRange( new Range( anchor, newFocus ) );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array\n\t * is treated like the last added range and is used to set {@link #anchor anchor} and {@link #focus focus}.\n\t * Accepts a flag describing in which way the selection is made.\n\t *\n\t * @private\n\t * @param {Iterable.} newRanges Iterable object of ranges to set.\n\t * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end\n\t * (`false`) or backward - from end to start (`true`). Defaults to `false`.\n\t */\n\t_setRanges( newRanges, isLastBackward = false ) {\n\t\t// New ranges should be copied to prevent removing them by setting them to `[]` first.\n\t\t// Only applies to situations when selection is set to the same selection or same selection's ranges.\n\t\tnewRanges = Array.from( newRanges );\n\n\t\tthis._ranges = [];\n\n\t\tfor ( const range of newRanges ) {\n\t\t\tthis._addRange( range );\n\t\t}\n\n\t\tthis._lastRangeBackward = !!isLastBackward;\n\t}\n\n\t/**\n\t * Sets this selection instance to be marked as `fake`. A fake selection does not render as browser native selection\n\t * over selected elements and is hidden to the user. This way, no native selection UI artifacts are displayed to\n\t * the user and selection over elements can be represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM (and be\n\t * properly handled by screen readers).\n\t *\n\t * @private\n\t * @param {Object} [options] Options.\n\t * @param {Boolean} [options.fake] If set to true selection will be marked as `fake`.\n\t * @param {String} [options.label=''] Fake selection label.\n\t */\n\t_setFakeOptions( options = {} ) {\n\t\tthis._isFake = !!options.fake;\n\t\tthis._fakeSelectionLabel = options.fake ? options.label || '' : '';\n\t}\n\n\t/**\n\t * Adds a range to the selection. Added range is copied. This means that passed range is not saved in the\n\t * selection instance and you can safely operate on it.\n\t *\n\t * Accepts a flag describing in which way the selection is made - passed range might be selected from\n\t * {@link module:engine/view/range~Range#start start} to {@link module:engine/view/range~Range#end end}\n\t * or from {@link module:engine/view/range~Range#end end} to {@link module:engine/view/range~Range#start start}.\n\t * The flag is used to set {@link #anchor anchor} and {@link #focus focus} properties.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in Selection instance.\n\t *\n\t * @private\n\t * @fires change\n\t * @param {module:engine/view/range~Range} range\n\t * @param {Boolean} [isBackward]\n\t */\n\t_addRange( range, isBackward = false ) {\n\t\tif ( !( range instanceof Range ) ) {\n\t\t\t/**\n\t\t\t * Selection range set to an object that is not an instance of {@link module:engine/view/range~Range}.\n\t\t\t *\n\t\t\t * @error view-selection-add-range-not-range\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-selection-add-range-not-range: ' +\n\t\t\t\t'Selection range set to an object that is not an instance of view.Range'\n\t\t\t);\n\t\t}\n\n\t\tthis._pushRange( range );\n\t\tthis._lastRangeBackward = !!isBackward;\n\t}\n\n\t/**\n\t * Adds range to selection - creates copy of given range so it can be safely used and modified.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in selection instance.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t */\n\t_pushRange( range ) {\n\t\tfor ( const storedRange of this._ranges ) {\n\t\t\tif ( range.isIntersecting( storedRange ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to add a range that intersects with another range from selection.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-range-intersects\n\t\t\t\t * @param {module:engine/view/range~Range} addedRange Range that was added to the selection.\n\t\t\t\t * @param {module:engine/view/range~Range} intersectingRange Range from selection that intersects with `addedRange`.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-range-intersects: Trying to add a range that intersects with another range from selection.',\n\t\t\t\t\t{ addedRange: range, intersectingRange: storedRange }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\n\t\tthis._ranges.push( new Range( range.start, range.end ) );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~Selection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( Selection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/documentselection\n */\n\nimport Selection from './selection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * Class representing the document selection in the view.\n *\n * Its instance is available in {@link module:engine/view/document~Document#selection `Document#selection`}.\n *\n * It is similar to {@link module:engine/view/selection~Selection} but\n * it has a read-only API and can be modified only by the writer available in\n * the {@link module:engine/view/view~View#change `View#change()`} block\n * (so via {@link module:engine/view/downcastwriter~DowncastWriter#setSelection `DowncastWriter#setSelection()`}).\n */\nexport default class DocumentSelection {\n\t/**\n\t * Creates new DocumentSelection instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new DocumentSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = new DocumentSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( start2, end2 ) ];\n\t *\t\tconst selection = new DocumentSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = new DocumentSelection( otherSelection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionAt( root, offset );\n\t *\t\tconst selection = new DocumentSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = new DocumentSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = new DocumentSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = new DocumentSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Selection is used internally (`DocumentSelection` is a proxy to that selection).\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/selection~Selection}\n\t\t */\n\t\tthis._selection = new Selection();\n\n\t\t// Delegate change event to be fired on DocumentSelection instance.\n\t\tthis._selection.delegate( 'change' ).to( this );\n\n\t\t// Set selection data.\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #_setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._selection.isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #_setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._selection.fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\treturn this._selection.anchor;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\treturn this._selection.focus;\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this._selection.isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._selection.rangeCount;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn this._selection.isBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\treturn this._selection.editableElement;\n\t}\n\n\t/**\n\t * Used for the compatibility with the {@link module:engine/view/selection~Selection#isEqual} method.\n\t *\n\t * @protected\n\t */\n\tget _ranges() {\n\t\treturn this._selection._ranges;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.}\n\t */\n\t* getRanges() {\n\t\tyield* this._selection.getRanges();\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\treturn this._selection.getFirstRange();\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\treturn this._selection.getLastRange();\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\treturn this._selection.getFirstPosition();\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\treturn this._selection.getLastPosition();\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\treturn this._selection.getSelectedElement();\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\treturn this._selection.isEqual( otherSelection );\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\treturn this._selection.isSimilar( otherSelection );\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( start2, end2 ) ];\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tdocumentSelection._setTo( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionAt( root, offset );\n\t *\t\tdocumentSelection._setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tdocumentSelection._setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tdocumentSelection._setTo( null );\n\t *\n\t * `Selection#_setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tdocumentSelection._setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to des cribe fake selection in DOM\n\t * (and be properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tdocumentSelection._setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.|module:engine/view/range~Range|module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\t_setTo( selectable, placeOrOffset, options ) {\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}\n\t * parameters.\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\t_setFocus( itemOrPosition, offset ) {\n\t\tthis._selection.setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~DocumentSelection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( DocumentSelection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/collection\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport uid from './uid';\nimport mix from './mix';\n\n/**\n * Collections are ordered sets of objects. Items in the collection can be retrieved by their indexes\n * in the collection (like in an array) or by their ids.\n *\n * If an object without an `id` property is being added to the collection, the `id` property will be generated\n * automatically. Note that the automatically generated id is unique only within this single collection instance.\n *\n * By default an item in the collection is identified by its `id` property. The name of the identifier can be\n * configured through the constructor of the collection.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Collection {\n\t/**\n\t * Creates a new Collection instance.\n\t *\n\t * @param {Object} [options={}] The options object.\n\t * @param {String} [options.idProperty='id'] The name of the property which is considered to identify an item.\n\t */\n\tconstructor( options = {} ) {\n\t\t/**\n\t\t * The internal list of items in the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Object[]}\n\t\t */\n\t\tthis._items = [];\n\n\t\t/**\n\t\t * The internal map of items in the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._itemMap = new Map();\n\n\t\t/**\n\t\t * The name of the property which is considered to identify an item.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._idProperty = options.idProperty || 'id';\n\n\t\t/**\n\t\t * A helper mapping external items of a bound collection ({@link #bindTo})\n\t\t * and actual items of this collection. It provides information\n\t\t * necessary to properly remove items bound to another collection.\n\t\t *\n\t\t * See {@link #_bindToInternalToExternalMap}.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._bindToExternalToInternalMap = new WeakMap();\n\n\t\t/**\n\t\t * A helper mapping items of this collection to external items of a bound collection\n\t\t * ({@link #bindTo}). It provides information necessary to manage the bindings, e.g.\n\t\t * to avoid loops in two–way bindings.\n\t\t *\n\t\t * See {@link #_bindToExternalToInternalMap}.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._bindToInternalToExternalMap = new WeakMap();\n\n\t\t/**\n\t\t * Stores indexes of skipped items from bound external collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Array}\n\t\t */\n\t\tthis._skippedIndexesFromExternal = [];\n\n\t\t/**\n\t\t * A collection instance this collection is bound to as a result\n\t\t * of calling {@link #bindTo} method.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/collection~Collection} #_bindToCollection\n\t\t */\n\t}\n\n\t/**\n\t * The number of items available in the collection.\n\t *\n\t * @member {Number} #length\n\t */\n\tget length() {\n\t\treturn this._items.length;\n\t}\n\n\t/**\n\t * Returns the first item from the collection or null when collection is empty.\n\t *\n\t * @returns {Object|null} The first item or `null` if collection is empty.\n\t */\n\tget first() {\n\t\treturn this._items[ 0 ] || null;\n\t}\n\n\t/**\n\t * Returns the last item from the collection or null when collection is empty.\n\t *\n\t * @returns {Object|null} The last item or `null` if collection is empty.\n\t */\n\tget last() {\n\t\treturn this._items[ this.length - 1 ] || null;\n\t}\n\n\t/**\n\t * Adds an item into the collection.\n\t *\n\t * If the item does not have an id, then it will be automatically generated and set on the item.\n\t *\n\t * @chainable\n\t * @param {Object} item\n\t * @param {Number} [index] The position of the item in the collection. The item\n\t * is pushed to the collection when `index` not specified.\n\t * @fires add\n\t */\n\tadd( item, index ) {\n\t\tlet itemId;\n\t\tconst idProperty = this._idProperty;\n\n\t\tif ( ( idProperty in item ) ) {\n\t\t\titemId = item[ idProperty ];\n\n\t\t\tif ( typeof itemId != 'string' ) {\n\t\t\t\t/**\n\t\t\t\t * This item's id should be a string.\n\t\t\t\t *\n\t\t\t\t * @error collection-add-invalid-id\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'collection-add-invalid-id' );\n\t\t\t}\n\n\t\t\tif ( this.get( itemId ) ) {\n\t\t\t\t/**\n\t\t\t\t * This item already exists in the collection.\n\t\t\t\t *\n\t\t\t\t * @error collection-add-item-already-exists\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'collection-add-item-already-exists' );\n\t\t\t}\n\t\t} else {\n\t\t\titem[ idProperty ] = itemId = uid();\n\t\t}\n\n\t\t// TODO: Use ES6 default function argument.\n\t\tif ( index === undefined ) {\n\t\t\tindex = this._items.length;\n\t\t} else if ( index > this._items.length || index < 0 ) {\n\t\t\t/**\n\t\t\t * The index number has invalid value.\n\t\t\t *\n\t\t\t * @error collection-add-item-bad-index\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-add-item-invalid-index' );\n\t\t}\n\n\t\tthis._items.splice( index, 0, item );\n\n\t\tthis._itemMap.set( itemId, item );\n\n\t\tthis.fire( 'add', item, index );\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Gets item by its id or index.\n\t *\n\t * @param {String|Number} idOrIndex The item id or index in the collection.\n\t * @returns {Object|null} The requested item or `null` if such item does not exist.\n\t */\n\tget( idOrIndex ) {\n\t\tlet item;\n\n\t\tif ( typeof idOrIndex == 'string' ) {\n\t\t\titem = this._itemMap.get( idOrIndex );\n\t\t} else if ( typeof idOrIndex == 'number' ) {\n\t\t\titem = this._items[ idOrIndex ];\n\t\t} else {\n\t\t\t/**\n\t\t\t * Index or id must be given.\n\t\t\t *\n\t\t\t * @error collection-get-invalid-arg\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-get-invalid-arg: Index or id must be given.' );\n\t\t}\n\n\t\treturn item || null;\n\t}\n\n\t/**\n\t * Gets index of item in the collection.\n\t * When item is not defined in the collection then index will be equal -1.\n\t *\n\t * @param {String|Object} idOrItem The item or its id in the collection.\n\t * @returns {Number} Index of given item.\n\t */\n\tgetIndex( idOrItem ) {\n\t\tlet item;\n\n\t\tif ( typeof idOrItem == 'string' ) {\n\t\t\titem = this._itemMap.get( idOrItem );\n\t\t} else {\n\t\t\titem = idOrItem;\n\t\t}\n\n\t\treturn this._items.indexOf( item );\n\t}\n\n\t/**\n\t * Removes an item from the collection.\n\t *\n\t * @param {Object|Number|String} subject The item to remove, its id or index in the collection.\n\t * @returns {Object} The removed item.\n\t * @fires remove\n\t */\n\tremove( subject ) {\n\t\tlet index, id, item;\n\t\tlet itemDoesNotExist = false;\n\t\tconst idProperty = this._idProperty;\n\n\t\tif ( typeof subject == 'string' ) {\n\t\t\tid = subject;\n\t\t\titem = this._itemMap.get( id );\n\t\t\titemDoesNotExist = !item;\n\n\t\t\tif ( item ) {\n\t\t\t\tindex = this._items.indexOf( item );\n\t\t\t}\n\t\t} else if ( typeof subject == 'number' ) {\n\t\t\tindex = subject;\n\t\t\titem = this._items[ index ];\n\t\t\titemDoesNotExist = !item;\n\n\t\t\tif ( item ) {\n\t\t\t\tid = item[ idProperty ];\n\t\t\t}\n\t\t} else {\n\t\t\titem = subject;\n\t\t\tid = item[ idProperty ];\n\t\t\tindex = this._items.indexOf( item );\n\t\t\titemDoesNotExist = ( index == -1 || !this._itemMap.get( id ) );\n\t\t}\n\n\t\tif ( itemDoesNotExist ) {\n\t\t\t/**\n\t\t\t * Item not found.\n\t\t\t *\n\t\t\t * @error collection-remove-404\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-remove-404: Item not found.' );\n\t\t}\n\n\t\tthis._items.splice( index, 1 );\n\t\tthis._itemMap.delete( id );\n\n\t\tconst externalItem = this._bindToInternalToExternalMap.get( item );\n\t\tthis._bindToInternalToExternalMap.delete( item );\n\t\tthis._bindToExternalToInternalMap.delete( externalItem );\n\n\t\tthis.fire( 'remove', item, index );\n\n\t\treturn item;\n\t}\n\n\t/**\n\t * Executes the callback for each item in the collection and composes an array or values returned by this callback.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @param {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Array} The result of mapping.\n\t */\n\tmap( callback, ctx ) {\n\t\treturn this._items.map( callback, ctx );\n\t}\n\n\t/**\n\t * Finds the first item in the collection for which the `callback` returns a true value.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @param {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Object} The item for which `callback` returned a true value.\n\t */\n\tfind( callback, ctx ) {\n\t\treturn this._items.find( callback, ctx );\n\t}\n\n\t/**\n\t * Returns an array with items for which the `callback` returned a true value.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @param {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Object[]} The array with matching items.\n\t */\n\tfilter( callback, ctx ) {\n\t\treturn this._items.filter( callback, ctx );\n\t}\n\n\t/**\n\t * Removes all items from the collection and destroys the binding created using\n\t * {@link #bindTo}.\n\t */\n\tclear() {\n\t\tif ( this._bindToCollection ) {\n\t\t\tthis.stopListening( this._bindToCollection );\n\t\t\tthis._bindToCollection = null;\n\t\t}\n\n\t\twhile ( this.length ) {\n\t\t\tthis.remove( 0 );\n\t\t}\n\t}\n\n\t/**\n\t * Binds and synchronizes the collection with another one.\n\t *\n\t * The binding can be a simple factory:\n\t *\n\t *\t\tclass FactoryClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).as( FactoryClass );\n\t *\n\t *\t\tsource.add( { label: 'foo' } );\n\t *\t\tsource.add( { label: 'bar' } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 1 ).label ); // 'bar'\n\t *\n\t *\t\tsource.remove( 0 );\n\t *\t\tconsole.log( target.length ); // 1\n\t *\t\tconsole.log( target.get( 0 ).label ); // 'bar'\n\t *\n\t * or the factory driven by a custom callback:\n\t *\n\t *\t\tclass FooClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tclass BarClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( ( item ) => {\n\t *\t\t\tif ( item.label == 'foo' ) {\n\t *\t\t\t\treturn new FooClass( item );\n\t *\t\t\t} else {\n\t *\t\t\t\treturn new BarClass( item );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\tsource.add( { label: 'foo' } );\n\t *\t\tsource.add( { label: 'bar' } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 0 ) instanceof FooClass ); // true\n\t *\t\tconsole.log( target.get( 1 ) instanceof BarClass ); // true\n\t *\n\t * or the factory out of property name:\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( 'label' );\n\t *\n\t *\t\tsource.add( { label: { value: 'foo' } } );\n\t *\t\tsource.add( { label: { value: 'bar' } } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 0 ).value ); // 'foo'\n\t *\t\tconsole.log( target.get( 1 ).value ); // 'bar'\n\t *\n\t * It's possible to skip specified items by returning falsy value:\n\t *\n\t *\t\tconst source = new Collection();\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( item => {\n\t *\t\t\tif ( item.hidden ) {\n\t *\t\t\t\treturn null;\n\t *\t\t\t}\n\t *\n\t *\t\t\treturn item;\n\t *\t\t} );\n\t *\n\t *\t\tsource.add( { hidden: true } );\n\t *\t\tsource.add( { hidden: false } );\n\t *\n\t *\t\tconsole.log( source.length ); // 2\n\t *\t\tconsole.log( target.length ); // 1\n\t *\n\t * **Note**: {@link #clear} can be used to break the binding.\n\t *\n\t * @param {module:utils/collection~Collection} externalCollection A collection to be bound.\n\t * @returns {Object}\n\t * @returns {module:utils/collection~Collection#bindTo#as} return.as\n\t * @returns {module:utils/collection~Collection#bindTo#using} return.using\n\t */\n\tbindTo( externalCollection ) {\n\t\tif ( this._bindToCollection ) {\n\t\t\t/**\n\t\t\t * The collection cannot be bound more than once.\n\t\t\t *\n\t\t\t * @error collection-bind-to-rebind\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-bind-to-rebind: The collection cannot be bound more than once.' );\n\t\t}\n\n\t\tthis._bindToCollection = externalCollection;\n\n\t\treturn {\n\t\t\t/**\n\t\t\t * Creates the class factory binding.\n\t\t\t *\n\t\t\t * @static\n\t\t\t * @param {Function} Class Specifies which class factory is to be initialized.\n\t\t\t */\n\t\t\tas: Class => {\n\t\t\t\tthis._setUpBindToBinding( item => new Class( item ) );\n\t\t\t},\n\n\t\t\t/**\n\t\t\t * Creates callback or property binding.\n\t\t\t *\n\t\t\t * @static\n\t\t\t * @param {Function|String} callbackOrProperty When the function is passed, it is used to\n\t\t\t * produce the items. When the string is provided, the property value is used to create\n\t\t\t * the bound collection items.\n\t\t\t */\n\t\t\tusing: callbackOrProperty => {\n\t\t\t\tif ( typeof callbackOrProperty == 'function' ) {\n\t\t\t\t\tthis._setUpBindToBinding( item => callbackOrProperty( item ) );\n\t\t\t\t} else {\n\t\t\t\t\tthis._setUpBindToBinding( item => item[ callbackOrProperty ] );\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Finalizes and activates a binding initiated by {#bindTo}.\n\t *\n\t * @protected\n\t * @param {Function} factory A function which produces collection items.\n\t */\n\t_setUpBindToBinding( factory ) {\n\t\tconst externalCollection = this._bindToCollection;\n\n\t\t// Adds the item to the collection once a change has been done to the external collection.\n\t\t//\n\t\t// @private\n\t\tconst addItem = ( evt, externalItem, index ) => {\n\t\t\tconst isExternalBoundToThis = externalCollection._bindToCollection == this;\n\t\t\tconst externalItemBound = externalCollection._bindToInternalToExternalMap.get( externalItem );\n\n\t\t\t// If an external collection is bound to this collection, which makes it a 2–way binding,\n\t\t\t// and the particular external collection item is already bound, don't add it here.\n\t\t\t// The external item has been created **out of this collection's item** and (re)adding it will\n\t\t\t// cause a loop.\n\t\t\tif ( isExternalBoundToThis && externalItemBound ) {\n\t\t\t\tthis._bindToExternalToInternalMap.set( externalItem, externalItemBound );\n\t\t\t\tthis._bindToInternalToExternalMap.set( externalItemBound, externalItem );\n\t\t\t} else {\n\t\t\t\tconst item = factory( externalItem );\n\n\t\t\t\t// When there is no item we need to remember skipped index first and then we can skip this item.\n\t\t\t\tif ( !item ) {\n\t\t\t\t\tthis._skippedIndexesFromExternal.push( index );\n\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Lets try to put item at the same index as index in external collection\n\t\t\t\t// but when there are a skipped items in one or both collections we need to recalculate this index.\n\t\t\t\tlet finalIndex = index;\n\n\t\t\t\t// When we try to insert item after some skipped items from external collection we need\n\t\t\t\t// to include this skipped items and decrease index.\n\t\t\t\t//\n\t\t\t\t// For the following example:\n\t\t\t\t// external -> [ 'A', 'B - skipped for internal', 'C - skipped for internal' ]\n\t\t\t\t// internal -> [ A ]\n\t\t\t\t//\n\t\t\t\t// Another item is been added at the end of external collection:\n\t\t\t\t// external.add( 'D' )\n\t\t\t\t// external -> [ 'A', 'B - skipped for internal', 'C - skipped for internal', 'D' ]\n\t\t\t\t//\n\t\t\t\t// We can't just add 'D' to internal at the same index as index in external because\n\t\t\t\t// this will produce empty indexes what is invalid:\n\t\t\t\t// internal -> [ 'A', empty, empty, 'D' ]\n\t\t\t\t//\n\t\t\t\t// So we need to include skipped items and decrease index\n\t\t\t\t// internal -> [ 'A', 'D' ]\n\t\t\t\tfor ( const skipped of this._skippedIndexesFromExternal ) {\n\t\t\t\t\tif ( index > skipped ) {\n\t\t\t\t\t\tfinalIndex--;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// We need to take into consideration that external collection could skip some items from\n\t\t\t\t// internal collection.\n\t\t\t\t//\n\t\t\t\t// For the following example:\n\t\t\t\t// internal -> [ 'A', 'B - skipped for external', 'C - skipped for external' ]\n\t\t\t\t// external -> [ A ]\n\t\t\t\t//\n\t\t\t\t// Another item is been added at the end of external collection:\n\t\t\t\t// external.add( 'D' )\n\t\t\t\t// external -> [ 'A', 'D' ]\n\t\t\t\t//\n\t\t\t\t// We need to include skipped items and place new item after them:\n\t\t\t\t// internal -> [ 'A', 'B - skipped for external', 'C - skipped for external', 'D' ]\n\t\t\t\tfor ( const skipped of externalCollection._skippedIndexesFromExternal ) {\n\t\t\t\t\tif ( finalIndex >= skipped ) {\n\t\t\t\t\t\tfinalIndex++;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tthis._bindToExternalToInternalMap.set( externalItem, item );\n\t\t\t\tthis._bindToInternalToExternalMap.set( item, externalItem );\n\t\t\t\tthis.add( item, finalIndex );\n\n\t\t\t\t// After adding new element to internal collection we need update indexes\n\t\t\t\t// of skipped items in external collection.\n\t\t\t\tfor ( let i = 0; i < externalCollection._skippedIndexesFromExternal.length; i++ ) {\n\t\t\t\t\tif ( finalIndex <= externalCollection._skippedIndexesFromExternal[ i ] ) {\n\t\t\t\t\t\texternalCollection._skippedIndexesFromExternal[ i ]++;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\n\t\t// Load the initial content of the collection.\n\t\tfor ( const externalItem of externalCollection ) {\n\t\t\taddItem( null, externalItem, externalCollection.getIndex( externalItem ) );\n\t\t}\n\n\t\t// Synchronize the with collection as new items are added.\n\t\tthis.listenTo( externalCollection, 'add', addItem );\n\n\t\t// Synchronize the with collection as new items are removed.\n\t\tthis.listenTo( externalCollection, 'remove', ( evt, externalItem, index ) => {\n\t\t\tconst item = this._bindToExternalToInternalMap.get( externalItem );\n\n\t\t\tif ( item ) {\n\t\t\t\tthis.remove( item );\n\t\t\t}\n\n\t\t\t// After removing element from external collection we need update/remove indexes\n\t\t\t// of skipped items in internal collection.\n\t\t\tthis._skippedIndexesFromExternal = this._skippedIndexesFromExternal.reduce( ( result, skipped ) => {\n\t\t\t\tif ( index < skipped ) {\n\t\t\t\t\tresult.push( skipped - 1 );\n\t\t\t\t}\n\n\t\t\t\tif ( index > skipped ) {\n\t\t\t\t\tresult.push( skipped );\n\t\t\t\t}\n\n\t\t\t\treturn result;\n\t\t\t}, [] );\n\t\t} );\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._items[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Fired when an item is added to the collection.\n\t *\n\t * @event add\n\t * @param {Object} item The added item.\n\t */\n\n\t/**\n\t * Fired when an item is removed from the collection.\n\t *\n\t * @event remove\n\t * @param {Object} item The removed item.\n\t * @param {Number} index Index from which item was removed.\n\t */\n}\n\nmix( Collection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/document\n */\n\nimport DocumentSelection from './documentselection';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\n/**\n * Document class creates an abstract layer over the content editable area, contains a tree of view elements and\n * {@link module:engine/view/documentselection~DocumentSelection view selection} associated with this document.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Document {\n\t/**\n\t * Creates a Document instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Selection done on this document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection} module:engine/view/document~Document#selection\n\t\t */\n\t\tthis.selection = new DocumentSelection();\n\n\t\t/**\n\t\t * Roots of the view tree. Collection of the {@link module:engine/view/element~Element view elements}.\n\t\t *\n\t\t * View roots are created as a result of binding between {@link module:engine/view/document~Document#roots} and\n\t\t * {@link module:engine/model/document~Document#roots} and this is handled by\n\t\t * {@link module:engine/controller/editingcontroller~EditingController}, so to create view root we need to create\n\t\t * model root using {@link module:engine/model/document~Document#createRoot}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/collection~Collection} module:engine/view/document~Document#roots\n\t\t */\n\t\tthis.roots = new Collection( { idProperty: 'rootName' } );\n\n\t\t/**\n\t\t * Defines whether document is in read-only mode.\n\t\t *\n\t\t * When document is read-ony then all roots are read-only as well and caret placed inside this root is hidden.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * True if document is focused.\n\t\t *\n\t\t * This property is updated by the {@link module:engine/view/observer/focusobserver~FocusObserver}.\n\t\t * If the {@link module:engine/view/observer/focusobserver~FocusObserver} is disabled this property will not change.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/document~Document#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * True if composition is in progress inside the document.\n\t\t *\n\t\t * This property is updated by the {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n\t\t * If the {@link module:engine/view/observer/compositionobserver~CompositionObserver} is disabled this property will not change.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/document~Document#isComposing\n\t\t */\n\t\tthis.set( 'isComposing', false );\n\n\t\t/**\n\t\t * Post-fixer callbacks registered to the view document.\n\t\t *\n\t\t * @private\n\t\t * @member {Set}\n\t\t */\n\t\tthis._postFixers = new Set();\n\t}\n\n\t/**\n\t * Gets a {@link module:engine/view/document~Document#roots view root element} with the specified name. If the name is not\n\t * specific \"main\" root is returned.\n\t *\n\t * @param {String} [name='main'] Name of the root.\n\t * @returns {module:engine/view/rooteditableelement~RootEditableElement|null} The view root element with the specified name\n\t * or null when there is no root of given name.\n\t */\n\tgetRoot( name = 'main' ) {\n\t\treturn this.roots.get( name );\n\t}\n\n\t/**\n\t * Used to register a post-fixer callback. A post-fixers mechanism allows to update view tree just before rendering\n\t * to the DOM.\n\t *\n\t * Post-fixers are fired just after all changes from the outermost change block were applied but\n\t * before the {@link module:engine/view/view~View#event:render render event} is fired. If a post-fixer callback made\n\t * a change, it should return `true`. When this happens, all post-fixers are fired again to check if something else should\n\t * not be fixed in the new document tree state.\n\t *\n\t * View post-fixers are useful when you wants to update view structure whenever it changes, for instance add some classes\n\t * to elements based on the view structure or selection. However, is you need DOM elements to be already updated, use\n\t * {@link module:engine/view/view~View#event:render render event}.\n\t *\n\t * As a parameter, a post-fixer callback receives a {@link module:engine/view/downcastwriter~DowncastWriter downcast writer}\n\t * instance connected with the executed changes block.\n\t *\n\t * @param {Function} postFixer\n\t */\n\tregisterPostFixer( postFixer ) {\n\t\tthis._postFixers.add( postFixer );\n\t}\n\n\t/**\n\t * Performs post-fixer loops. Executes post-fixer callbacks as long as none of them has done any changes to the model.\n\t *\n\t * @protected\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer\n\t */\n\t_callPostFixers( writer ) {\n\t\tlet wasFixed = false;\n\n\t\tdo {\n\t\t\tfor ( const callback of this._postFixers ) {\n\t\t\t\twasFixed = callback( writer );\n\n\t\t\t\tif ( wasFixed ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} while ( wasFixed );\n\t}\n\n\t/**\n\t * Event fired whenever document content layout changes. It is fired whenever content is\n\t * {@link module:engine/view/view~View#event:render rendered}, but should be also fired by observers in case of\n\t * other actions which may change layout, for instance when image loads.\n\t *\n\t * @event layoutChanged\n\t */\n}\n\nmix( Document, ObservableMixin );\n\n/**\n * Enum representing type of the change.\n *\n * Possible values:\n *\n * * `children` - for child list changes,\n * * `attributes` - for element attributes changes,\n * * `text` - for text nodes changes.\n *\n * @typedef {String} module:engine/view/document~ChangeType\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/attributeelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// Default attribute priority.\nconst DEFAULT_PRIORITY = 10;\n\n/**\n * Attribute elements are used to represent formatting elements in the view (think – ``, ``, etc.).\n * Most often they are created when downcasting model text attributes.\n *\n * Editing engine does not define a fixed HTML DTD. This is why a feature developer needs to choose between various\n * types (container element, {@link module:engine/view/attributeelement~AttributeElement attribute element},\n * {@link module:engine/view/emptyelement~EmptyElement empty element}, etc) when developing a feature.\n *\n * To create a new attribute element instance use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createAttributeElement `DowncastWriter#createAttributeElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class AttributeElement extends Element {\n\t/**\n\t * Creates an attribute element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createAttributeElement\n\t * @see module:engine/view/element~Element\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\n\t\t/**\n\t\t * Element priority. Decides in what order elements are wrapped by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Number}\n\t\t */\n\t\tthis._priority = DEFAULT_PRIORITY;\n\n\t\t/**\n\t\t * Element identifier. If set, it is used by {@link module:engine/view/element~Element#isSimilar},\n\t\t * and then two elements are considered similar if, and only if they have the same `_id`.\n\t\t *\n\t\t * @protected\n\t\t * @member {String|Number}\n\t\t */\n\t\tthis._id = null;\n\n\t\t/**\n\t\t * Keeps all the attribute elements that have the same {@link module:engine/view/attributeelement~AttributeElement#id ids}\n\t\t * and still exist in the view tree.\n\t\t *\n\t\t * This property is managed by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set.|null}\n\t\t */\n\t\tthis._clonesGroup = null;\n\t}\n\n\t/**\n\t * Element priority. Decides in what order elements are wrapped by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget priority() {\n\t\treturn this._priority;\n\t}\n\n\t/**\n\t * Element identifier. If set, it is used by {@link module:engine/view/element~Element#isSimilar},\n\t * and then two elements are considered similar if, and only if they have the same `id`.\n\t *\n\t * @readonly\n\t * @type {String|Number}\n\t */\n\tget id() {\n\t\treturn this._id;\n\t}\n\n\t/**\n\t * Returns all {@link module:engine/view/attributeelement~AttributeElement attribute elements} that has the\n\t * same {@link module:engine/view/attributeelement~AttributeElement#id id} and are in the view tree (were not removed).\n\t *\n\t * Note: If this element has been removed from the tree, returned set will not include it.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError attribute-element-get-elements-with-same-id-no-id}\n\t * if this element has no `id`.\n\t *\n\t * @returns {Set.} Set containing all the attribute elements\n\t * with the same `id` that were added and not removed from the view tree.\n\t */\n\tgetElementsWithSameId() {\n\t\tif ( this.id === null ) {\n\t\t\t/**\n\t\t\t * Cannot get elements with the same id for an attribute element without id.\n\t\t\t *\n\t\t\t * @error attribute-element-get-elements-with-same-id-no-id\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'attribute-element-get-elements-with-same-id-no-id: ' +\n\t\t\t\t'Cannot get elements with the same id for an attribute element without id.'\n\t\t\t);\n\t\t}\n\n\t\treturn new Set( this._clonesGroup );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'attributeElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'attributeElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t *\n\t * If none of elements has set {@link module:engine/view/attributeelement~AttributeElement#id}, then both elements\n\t * should have the same name, attributes and priority to be considered as similar. Two similar elements can contain\n\t * different set of children nodes.\n\t *\n\t * If at least one element has {@link module:engine/view/attributeelement~AttributeElement#id} set, then both\n\t * elements have to have the same {@link module:engine/view/attributeelement~AttributeElement#id} value to be\n\t * considered similar.\n\t *\n\t * Similarity is important for {@link module:engine/view/downcastwriter~DowncastWriter}. For example:\n\t *\n\t * * two following similar elements can be merged together into one, longer element,\n\t * * {@link module:engine/view/downcastwriter~DowncastWriter#unwrap} checks similarity of passed element and processed element to\n\t * decide whether processed element should be unwrapped,\n\t * * etc.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\t// If any element has an `id` set, just compare the ids.\n\t\tif ( this.id !== null || otherElement.id !== null ) {\n\t\t\treturn this.id === otherElement.id;\n\t\t}\n\n\t\treturn super.isSimilar( otherElement ) && this.priority == otherElement.priority;\n\t}\n\n\t/**\n\t * Clones provided element with priority.\n\t *\n\t * @protected\n\t * @param {Boolean} deep If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/attributeelement~AttributeElement} Clone of this element.\n\t */\n\t_clone( deep ) {\n\t\tconst cloned = super._clone( deep );\n\n\t\t// Clone priority too.\n\t\tcloned._priority = this._priority;\n\n\t\t// And id too.\n\t\tcloned._id = this._id;\n\n\t\treturn cloned;\n\t}\n}\n\n/**\n * Default attribute priority.\n *\n * @member {Number} module:engine/view/attributeelement~AttributeElement.DEFAULT_PRIORITY\n */\nAttributeElement.DEFAULT_PRIORITY = DEFAULT_PRIORITY;\n\n// Returns block {@link module:engine/view/filler~Filler filler} offset or `null` if block filler is not needed.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getFillerOffset() {\n\t// foo does not need filler.\n\tif ( nonUiChildrenCount( this ) ) {\n\t\treturn null;\n\t}\n\n\tlet element = this.parent;\n\n\t//

needs filler ->


\n\twhile ( element && element.is( 'attributeElement' ) ) {\n\t\tif ( nonUiChildrenCount( element ) > 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\telement = element.parent;\n\t}\n\n\tif ( !element || nonUiChildrenCount( element ) > 1 ) {\n\t\treturn null;\n\t}\n\n\t// Render block filler at the end of element (after all ui elements).\n\treturn this.childCount;\n}\n\n// Returns total count of children that are not {@link module:engine/view/uielement~UIElement UIElements}.\n//\n// @param {module:engine/view/element~Element} element\n// @returns {Number}\nfunction nonUiChildrenCount( element ) {\n\treturn Array.from( element.getChildren() ).filter( element => !element.is( 'uiElement' ) ).length;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/emptyelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\n\n/**\n * Empty element class. It is used to represent elements that cannot contain any child nodes (for example `` elements).\n *\n * To create a new empty element use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class EmptyElement extends Element {\n\t/**\n\t * Creates new instance of EmptyElement.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-emptyelement-cannot-add` when third parameter is passed,\n\t * to inform that usage of EmptyElement is incorrect (adding child nodes to EmptyElement is forbidden).\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createEmptyElement\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attributes] Collection of attributes.\n\t */\n\tconstructor( name, attributes, children ) {\n\t\tsuper( name, attributes, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for EmptyElements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'emptyElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'emptyElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Overrides {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-emptyelement-cannot-add` to prevent\n\t * adding any child nodes to EmptyElement.\n\t *\n\t * @protected\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to {@link module:engine/view/emptyelement~EmptyElement}.\n\t\t\t *\n\t\t\t * @error view-emptyelement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-emptyelement-cannot-add: Cannot add child nodes to EmptyElement instance.' );\n\t\t}\n\t}\n}\n\n// Returns `null` because block filler is not needed for EmptyElements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals navigator:false */\n\n/**\n * @module utils/env\n */\n\nconst userAgent = navigator.userAgent.toLowerCase();\n\n/**\n * A namespace containing environment and browser information.\n *\n * @namespace\n */\nconst env = {\n\t/**\n\t * Indicates that the application is running on Macintosh.\n\t *\n\t * @static\n\t * @member {Boolean} module:utils/env~env#isMac\n\t */\n\tisMac: isMac( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Microsoft Edge.\n\t *\n\t * @static\n\t * @member {Boolean} module:utils/env~env#isEdge\n\t */\n\tisEdge: isEdge( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Firefox (Gecko).\n\t *\n\t * @static\n\t * @member {Boolean} module:utils/env~env#isEdge\n\t */\n\tisGecko: isGecko( userAgent )\n};\n\nexport default env;\n\n/**\n * Checks if User Agent represented by the string is running on Macintosh.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is running on Macintosh or not.\n */\nexport function isMac( userAgent ) {\n\treturn userAgent.indexOf( 'macintosh' ) > -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Microsoft Edge.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Edge or not.\n */\nexport function isEdge( userAgent ) {\n\treturn !!userAgent.match( /edge\\/(\\d+.?\\d*)/ );\n}\n\n/**\n * Checks if User Agent represented by the string is Firefox (Gecko).\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Firefox or not.\n */\nexport function isGecko( userAgent ) {\n\treturn !!userAgent.match( /gecko\\/\\d+/ );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * Set of utils related to keyboard support.\n *\n * @module utils/keyboard\n */\n\nimport CKEditorError from './ckeditorerror';\nimport env from './env';\n\nconst macGlyphsToModifiers = {\n\t'⌘': 'ctrl',\n\t'⇧': 'shift',\n\t'⌥': 'alt'\n};\n\nconst modifiersToMacGlyphs = {\n\t'ctrl': '⌘',\n\t'shift': '⇧',\n\t'alt': '⌥'\n};\n\n/**\n * Object with `keyName => keyCode` pairs for a set of known keys.\n *\n * Contains:\n *\n * * `a-z`,\n * * `0-9`,\n * * `f1-f12`,\n * * `arrow(left|up|right|bottom)`,\n * * `backspace`, `delete`, `enter`, `esc`, `tab`,\n * * `ctrl`, `cmd`, `shift`, `alt`.\n */\nexport const keyCodes = generateKnownKeyCodes();\n\n/**\n * Converts a key name or a {@link module:utils/keyboard~KeystrokeInfo keystroke info} into a key code.\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * @param {String|module:utils/keyboard~KeystrokeInfo} Key name (see {@link module:utils/keyboard~keyCodes})\n * or a keystroke data object.\n * @returns {Number} Key or keystroke code.\n */\nexport function getCode( key ) {\n\tlet keyCode;\n\n\tif ( typeof key == 'string' ) {\n\t\tkeyCode = keyCodes[ key.toLowerCase() ];\n\n\t\tif ( !keyCode ) {\n\t\t\t/**\n\t\t\t * Unknown key name. Only key names contained by the {@link module:utils/keyboard~keyCodes} can be used.\n\t\t\t *\n\t\t\t * @errror keyboard-unknown-key\n\t\t\t * @param {String} key\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'keyboard-unknown-key: Unknown key name.', { key } );\n\t\t}\n\t} else {\n\t\tkeyCode = key.keyCode +\n\t\t\t( key.altKey ? keyCodes.alt : 0 ) +\n\t\t\t( key.ctrlKey ? keyCodes.ctrl : 0 ) +\n\t\t\t( key.shiftKey ? keyCodes.shift : 0 );\n\t}\n\n\treturn keyCode;\n}\n\n/**\n * Parses keystroke and returns a keystroke code that will match the code returned by\n * link {@link module:utils/keyboard.getCode} for a corresponding {@link module:utils/keyboard~KeystrokeInfo keystroke info}.\n *\n * The keystroke can be passed in two formats:\n *\n * * as a single string – e.g. `ctrl + A`,\n * * as an array of {@link module:utils/keyboard~keyCodes known key names} and key codes – e.g.:\n * * `[ 'ctrl', 32 ]` (ctrl + space),\n * * `[ 'ctrl', 'a' ]` (ctrl + A).\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * Note: Only keystrokes with a single non-modifier key are supported (e.g. `ctrl+A` is OK, but `ctrl+A+B` is not).\n *\n * @param {String|Array.} keystroke Keystroke definition.\n * @returns {Number} Keystroke code.\n */\nexport function parseKeystroke( keystroke ) {\n\tif ( typeof keystroke == 'string' ) {\n\t\tkeystroke = splitKeystrokeText( keystroke );\n\t}\n\n\treturn keystroke\n\t\t.map( key => ( typeof key == 'string' ) ? getCode( key ) : key )\n\t\t.reduce( ( key, sum ) => sum + key, 0 );\n}\n\n/**\n * It translates any keystroke string text like `\"CTRL+A\"` to an\n * environment–specific keystroke, i.e. `\"⌘A\"` on Mac OSX.\n *\n * @param {String} keystroke Keystroke text.\n * @returns {String} Keystroke text specific for the environment.\n */\nexport function getEnvKeystrokeText( keystroke ) {\n\tif ( !env.isMac ) {\n\t\treturn keystroke;\n\t}\n\n\treturn splitKeystrokeText( keystroke )\n\t\t// Replace modifiers (e.g. \"ctrl\") with Mac glyphs (e.g. \"⌘\") first.\n\t\t.map( key => modifiersToMacGlyphs[ key.toLowerCase() ] || key )\n\n\t\t// Decide whether to put \"+\" between keys in the keystroke or not.\n\t\t.reduce( ( value, key ) => {\n\t\t\tif ( value.slice( -1 ) in macGlyphsToModifiers ) {\n\t\t\t\treturn value + key;\n\t\t\t} else {\n\t\t\t\treturn value + '+' + key;\n\t\t\t}\n\t\t} );\n}\n\nfunction generateKnownKeyCodes() {\n\tconst keyCodes = {\n\t\tarrowleft: 37,\n\t\tarrowup: 38,\n\t\tarrowright: 39,\n\t\tarrowdown: 40,\n\t\tbackspace: 8,\n\t\tdelete: 46,\n\t\tenter: 13,\n\t\tspace: 32,\n\t\tesc: 27,\n\t\ttab: 9,\n\n\t\t// The idea about these numbers is that they do not collide with any real key codes, so we can use them\n\t\t// like bit masks.\n\t\tctrl: 0x110000,\n\t\t// Has the same code as ctrl, because their behaviour should be unified across the editor.\n\t\t// See http://ckeditor.github.io/editor-recommendations/general-policies#ctrl-vs-cmd\n\t\tcmd: 0x110000,\n\t\tshift: 0x220000,\n\t\talt: 0x440000\n\t};\n\n\t// a-z\n\tfor ( let code = 65; code <= 90; code++ ) {\n\t\tconst letter = String.fromCharCode( code );\n\n\t\tkeyCodes[ letter.toLowerCase() ] = code;\n\t}\n\n\t// 0-9\n\tfor ( let code = 48; code <= 57; code++ ) {\n\t\tkeyCodes[ code - 48 ] = code;\n\t}\n\n\t// F1-F12\n\tfor ( let code = 112; code <= 123; code++ ) {\n\t\tkeyCodes[ 'f' + ( code - 111 ) ] = code;\n\t}\n\n\treturn keyCodes;\n}\n\nfunction splitKeystrokeText( keystroke ) {\n\treturn keystroke.split( /\\s*\\+\\s*/ );\n}\n\n/**\n * Information about a keystroke.\n *\n * @interface module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * The [key code](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode).\n *\n * @member {Number} module:utils/keyboard~KeystrokeInfo#keyCode\n */\n\n/**\n * Whether the Alt modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#altKey\n */\n\n/**\n * Whether the Ctrl or Cmd modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#ctrlKey\n */\n\n/**\n * Whether the Shift modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#shiftKey\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/uielement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * UI element class. It should be used to represent editing UI which needs to be injected into the editing view\n * If possible, you should keep your UI outside the editing view. However, if that is not possible,\n * UI elements can be used.\n *\n * How a UI element is rendered is in your control (you pass a callback to\n * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`}).\n * The editor will ignore your UI element – the selection cannot be placed in it, it is skipped (invisible) when\n * the user modifies the selection by using arrow keys and the editor does not listen to any mutations which\n * happen inside your UI elements.\n *\n * The limitation is that you cannot convert a model element to a UI element. UI elements need to be\n * created for {@link module:engine/model/markercollection~Marker markers} or as additinal elements\n * inside normal {@link module:engine/view/containerelement~ContainerElement container elements}.\n *\n * To create a new UI element use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class UIElement extends Element {\n\t/**\n\t * Creates new instance of UIElement.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-uielement-cannot-add` when third parameter is passed,\n\t * to inform that usage of UIElement is incorrect (adding child nodes to UIElement is forbidden).\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createUIElement\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attributes] Collection of attributes.\n\t */\n\tconstructor( name, attributes, children ) {\n\t\tsuper( name, attributes, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for UIElements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'uiElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'uiElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Overrides {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-uielement-cannot-add` to prevent adding any child nodes\n\t * to UIElement.\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to {@link module:engine/view/uielement~UIElement}.\n\t\t\t *\n\t\t\t * @error view-uielement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-uielement-cannot-add: Cannot add child nodes to UIElement instance.' );\n\t\t}\n\t}\n\n\t/**\n\t * Renders this {@link module:engine/view/uielement~UIElement} to DOM. This method is called by\n\t * {@link module:engine/view/domconverter~DomConverter}.\n\t * Do not use inheritance to create custom rendering method, replace `render()` method instead:\n\t *\n\t *\t\tconst myUIElement = downcastWriter.createUIElement( 'span' );\n\t *\t\tmyUIElement.render = function( domDocument ) {\n\t *\t\t\tconst domElement = this.toDomElement( domDocument );\n\t *\t\t\tdomElement.innerHTML = 'this is ui element';\n\t *\n\t *\t\t\treturn domElement;\n\t *\t\t};\n\t *\n\t * @param {Document} domDocument\n\t * @returns {HTMLElement}\n\t */\n\trender( domDocument ) {\n\t\treturn this.toDomElement( domDocument );\n\t}\n\n\t/**\n\t * Creates DOM element based on this view UIElement.\n\t * Note that each time this method is called new DOM element is created.\n\t *\n\t * @param {Document} domDocument\n\t * @returns {HTMLElement}\n\t */\n\ttoDomElement( domDocument ) {\n\t\tconst domElement = domDocument.createElement( this.name );\n\n\t\tfor ( const key of this.getAttributeKeys() ) {\n\t\t\tdomElement.setAttribute( key, this.getAttribute( key ) );\n\t\t}\n\n\t\treturn domElement;\n\t}\n}\n\n/**\n * This function injects UI element handling to the given {@link module:engine/view/document~Document document}.\n *\n * A callback is added to {@link module:engine/view/document~Document#event:keydown document keydown event}.\n * The callback handles the situation when right arrow key is pressed and selection is collapsed before a UI element.\n * Without this handler, it would be impossible to \"jump over\" UI element using right arrow key.\n *\n * @param {module:engine/view/view~View} view View controller to which the quirks handling will be injected.\n */\nexport function injectUiElementHandling( view ) {\n\tview.document.on( 'keydown', ( evt, data ) => jumpOverUiElement( evt, data, view.domConverter ) );\n}\n\n// Returns `null` because block filler is not needed for UIElements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n\n// Selection cannot be placed in a `UIElement`. Whenever it is placed there, it is moved before it. This\n// causes a situation when it is impossible to jump over `UIElement` using right arrow key, because the selection\n// ends up in ui element (in DOM) and is moved back to the left. This handler fixes this situation.\nfunction jumpOverUiElement( evt, data, domConverter ) {\n\tif ( data.keyCode == keyCodes.arrowright ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\t\tconst domSelectionCollapsed = domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed;\n\n\t\t// Jump over UI element if selection is collapsed or shift key is pressed. These are the cases when selection would extend.\n\t\tif ( domSelectionCollapsed || data.shiftKey ) {\n\t\t\tconst domParent = domSelection.focusNode;\n\t\t\tconst domOffset = domSelection.focusOffset;\n\n\t\t\tconst viewPosition = domConverter.domPositionToView( domParent, domOffset );\n\n\t\t\t// In case if dom element is not converted to view or is not mapped or something. Happens for example in some tests.\n\t\t\tif ( viewPosition === null ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Skip all following ui elements.\n\t\t\tlet jumpedOverAnyUiElement = false;\n\n\t\t\tconst nextViewPosition = viewPosition.getLastMatchingPosition( value => {\n\t\t\t\tif ( value.item.is( 'uiElement' ) ) {\n\t\t\t\t\t// Remember that there was at least one ui element.\n\t\t\t\t\tjumpedOverAnyUiElement = true;\n\t\t\t\t}\n\n\t\t\t\t// Jump over ui elements, jump over empty attribute elements, move up from inside of attribute element.\n\t\t\t\tif ( value.item.is( 'uiElement' ) || value.item.is( 'attributeElement' ) ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\n\t\t\t\t// Don't jump over text or don't get out of container element.\n\t\t\t\treturn false;\n\t\t\t} );\n\n\t\t\t// If anything has been skipped, fix position.\n\t\t\t// This `if` could be possibly omitted but maybe it is better not to mess with DOM selection if not needed.\n\t\t\tif ( jumpedOverAnyUiElement ) {\n\t\t\t\tconst newDomPosition = domConverter.viewPositionToDom( nextViewPosition );\n\n\t\t\t\tif ( domSelectionCollapsed ) {\n\t\t\t\t\t// Selection was collapsed, so collapse it at further position.\n\t\t\t\t\tdomSelection.collapse( newDomPosition.parent, newDomPosition.offset );\n\t\t\t\t} else {\n\t\t\t\t\t// Selection was not collapse, so extend it instead of collapsing.\n\t\t\t\t\tdomSelection.extend( newDomPosition.parent, newDomPosition.offset );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/documentfragment\n */\n\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * Document fragment.\n *\n * To create a new document fragment instance use the\n * {@link module:engine/view/upcastwriter~UpcastWriter#createDocumentFragment `UpcastWriter#createDocumentFragment()`}\n * method.\n */\nexport default class DocumentFragment {\n\t/**\n\t * Creates new DocumentFragment instance.\n\t *\n\t * @protected\n\t * @param {module:engine/view/node~Node|Iterable.} [children]\n\t * A list of nodes to be inserted into the created document fragment.\n\t */\n\tconstructor( children ) {\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.} module:engine/view/documentfragment~DocumentFragment#_children\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over nodes added to this document fragment.\n\t *\n\t * @returns {Iterable.}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Number of child nodes in this document fragment.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this document fragment, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Artificial root of `DocumentFragment`. Returns itself. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Artificial parent of `DocumentFragment`. Returns `null`. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {null}\n\t */\n\tget parent() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'documentFragment';\n\t}\n\n\t/**\n\t * {@link module:engine/view/documentfragment~DocumentFragment#_insertChild Insert} a child node or a list of child nodes at the end\n\t * and sets the parent of these nodes to this fragment.\n\t *\n\t * @param {module:engine/view/item~Item|Iterable.} items Items to be inserted.\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this fragment.\n\t *\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.} items Items to be inserted.\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Fires `change` event with given type of the change.\n\t *\n\t * @private\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\t}\n}\n\nmix( DocumentFragment, EmitterMixin );\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.}\n// @returns {Iterable.}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module module:engine/view/downcastwriter\n */\n\nimport Position from './position';\nimport Range from './range';\nimport Selection from './selection';\nimport ContainerElement from './containerelement';\nimport AttributeElement from './attributeelement';\nimport EmptyElement from './emptyelement';\nimport UIElement from './uielement';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport DocumentFragment from './documentfragment';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport Text from './text';\nimport EditableElement from './editableelement';\nimport { isPlainObject } from 'lodash-es';\n\n/**\n * View downcast writer.\n *\n * It provides a set of methods used to manipulate view nodes.\n *\n * Do not create an instance of this writer manually. To modify a view structure, use\n * the {@link module:engine/view/view~View#change `View#change()`} block.\n *\n * The `DowncastWriter` is designed to work with semantic views which are the views that were/are being downcasted from the model.\n * To work with ordinary views (e.g. parsed from a pasted content) use the\n * {@link module:engine/view/upcastwriter~UpcastWriter upcast writer}.\n *\n * Read more about changing the view in the {@glink framework/guides/architecture/editing-engine#changing-the-view Changing the view}\n * section of the {@glink framework/guides/architecture/editing-engine Editing engine architecture} guide.\n */\nexport default class DowncastWriter {\n\tconstructor( document ) {\n\t\t/**\n\t\t * @readonly\n\t\t * @type {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * Holds references to the attribute groups that share the same {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t\t * The keys are `id`s, the values are `Set`s holding {@link module:engine/view/attributeelement~AttributeElement}s.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.}\n\t\t */\n\t\tthis._cloneGroups = new Map();\n\t}\n\n\t/**\n\t * Sets {@link module:engine/view/documentselection~DocumentSelection selection's} ranges and direction to the\n\t * specified location based on the given {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t * Usage:\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets backward selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\twriter.setSelection( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\twriter.setSelection( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\twriter.setSelection( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t * \t\twriter.setSelection( paragraph, 'in' );\n\t *\n\t * Creates a range on the {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'on' );\n\t *\n\t * \t\t// Removes all ranges.\n\t *\t\twriter.setSelection( null );\n\t *\n\t * `DowncastWriter#setSelection()` allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\twriter.setSelection( range, { backward: true } );\n\t *\n\t *\t\t// Sets selection as fake.\n\t *\t\t// Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * \t\t// This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * \t\t// represented in other way, for example by applying proper CSS class.\n\t *\t\twriter.setSelection( range, { fake: true } );\n\t *\n\t * \t\t// Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * \t\t// (and be properly handled by screen readers).\n\t *\t\twriter.setSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.|module:engine/view/range~Range|module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetSelection( selectable, placeOrOffset, options ) {\n\t\tthis.document.selection._setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/view/documentselection~DocumentSelection#focus selection's focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}\n\t * parameters.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetSelectionFocus( itemOrPosition, offset ) {\n\t\tthis.document.selection._setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/text~Text text node}.\n\t *\n\t *\t\twriter.createText( 'foo' );\n\t *\n\t * @param {String} data The text's data.\n\t * @returns {module:engine/view/text~Text} The created text node.\n\t */\n\tcreateText( data ) {\n\t\treturn new Text( data );\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/attributeelement~AttributeElement}.\n\t *\n\t *\t\twriter.createAttributeElement( 'strong' );\n\t *\t\twriter.createAttributeElement( 'strong', { alignment: 'center' } );\n\t *\n\t *\t\t// Make `` element contain other attributes element so the `` element is not broken.\n\t *\t\twriter.createAttributeElement( 'a', { href: 'foo.bar' }, { priority: 5 } );\n\t *\n\t *\t\t// Set `id` of a marker element so it is not joined or merged with \"normal\" elements.\n\t *\t\twriter.createAttributeElement( 'span', { class: 'myMarker' }, { id: 'marker:my' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Element's attributes.\n\t * @param {Object} [options] Element's options.\n\t * @param {Number} [options.priority] Element's {@link module:engine/view/attributeelement~AttributeElement#priority priority}.\n\t * @param {Number|String} [options.id] Element's {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t * @returns {module:engine/view/attributeelement~AttributeElement} Created element.\n\t */\n\tcreateAttributeElement( name, attributes, options = {} ) {\n\t\tconst attributeElement = new AttributeElement( name, attributes );\n\n\t\tif ( options.priority ) {\n\t\t\tattributeElement._priority = options.priority;\n\t\t}\n\n\t\tif ( options.id ) {\n\t\t\tattributeElement._id = options.id;\n\t\t}\n\n\t\treturn attributeElement;\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/containerelement~ContainerElement}.\n\t *\n\t *\t\twriter.createContainerElement( 'paragraph' );\n\t *\t\twriter.createContainerElement( 'paragraph', { alignment: 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/containerelement~ContainerElement} Created element.\n\t */\n\tcreateContainerElement( name, attributes ) {\n\t\treturn new ContainerElement( name, attributes );\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t *\t\twriter.createEditableElement( 'div' );\n\t *\t\twriter.createEditableElement( 'div', { alignment: 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/editableelement~EditableElement} Created element.\n\t */\n\tcreateEditableElement( name, attributes ) {\n\t\tconst editableElement = new EditableElement( name, attributes );\n\t\teditableElement._document = this.document;\n\n\t\treturn editableElement;\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/emptyelement~EmptyElement}.\n\t *\n\t *\t\twriter.createEmptyElement( 'img' );\n\t *\t\twriter.createEmptyElement( 'img', { alignment: 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/emptyelement~EmptyElement} Created element.\n\t */\n\tcreateEmptyElement( name, attributes ) {\n\t\treturn new EmptyElement( name, attributes );\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/uielement~UIElement}.\n\t *\n\t *\t\twriter.createUIElement( 'span' );\n\t *\t\twriter.createUIElement( 'span', { alignment: 'center' } );\n\t *\n\t * Custom render function can be provided as third parameter:\n\t *\n\t *\t\twriter.createUIElement( 'span', null, function( domDocument ) {\n\t *\t\t\tconst domElement = this.toDomElement( domDocument );\n\t *\t\t\tdomElement.innerHTML = 'this is ui element';\n\t *\n\t *\t\t\treturn domElement;\n\t *\t\t} );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @param {Function} [renderFunction] Custom render function.\n\t * @returns {module:engine/view/uielement~UIElement} Created element.\n\t */\n\tcreateUIElement( name, attributes, renderFunction ) {\n\t\tconst uiElement = new UIElement( name, attributes );\n\n\t\tif ( renderFunction ) {\n\t\t\tuiElement.render = renderFunction;\n\t\t}\n\n\t\treturn uiElement;\n\t}\n\n\t/**\n\t * Adds or overwrite element's attribute with a specified key and value.\n\t *\n\t *\t\twriter.setAttribute( 'href', 'http://ckeditor.com', linkElement );\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tsetAttribute( key, value, element ) {\n\t\telement._setAttribute( key, value );\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t *\t\twriter.removeAttribute( 'href', linkElement );\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveAttribute( key, element ) {\n\t\telement._removeAttribute( key );\n\t}\n\n\t/**\n\t * Adds specified class to the element.\n\t *\n\t *\t\twriter.addClass( 'foo', linkElement );\n\t *\t\twriter.addClass( [ 'foo', 'bar' ], linkElement );\n\t *\n\t * @param {Array.|String} className\n\t * @param {module:engine/view/element~Element} element\n\t */\n\taddClass( className, element ) {\n\t\telement._addClass( className );\n\t}\n\n\t/**\n\t * Removes specified class from the element.\n\t *\n\t *\t\twriter.removeClass( 'foo', linkElement );\n\t *\t\twriter.removeClass( [ 'foo', 'bar' ], linkElement );\n\t *\n\t * @param {Array.|String} className\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveClass( className, element ) {\n\t\telement._removeClass( className );\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\twriter.setStyle( 'color', 'red', element );\n\t *\t\twriter.setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t}, element );\n\t *\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @param {module:engine/view/element~Element} element Element to set styles on.\n\t */\n\tsetStyle( property, value, element ) {\n\t\tif ( isPlainObject( property ) && element === undefined ) {\n\t\t\telement = value;\n\t\t}\n\n\t\telement._setStyle( property, value );\n\t}\n\n\t/**\n\t * Removes specified style from the element.\n\t *\n\t *\t\twriter.removeStyle( 'color', element ); // Removes 'color' style.\n\t *\t\twriter.removeStyle( [ 'color', 'border-top' ], element ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * @param {Array.|String} property\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveStyle( property, element ) {\n\t\telement._removeStyle( property );\n\t}\n\n\t/**\n\t * Sets a custom property on element. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tsetCustomProperty( key, value, element ) {\n\t\telement._setCustomProperty( key, value );\n\t}\n\n\t/**\n\t * Removes a custom property stored under the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @param {module:engine/view/element~Element} element\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\tremoveCustomProperty( key, element ) {\n\t\treturn element._removeCustomProperty( key );\n\t}\n\n\t/**\n\t * Breaks attribute nodes at provided position or at boundaries of provided range. It breaks attribute elements inside\n\t * up to a container element.\n\t *\n\t * In following examples `

` is a container, `` and `` are attribute nodes:\n\t *\n\t *

foobar{}

->

foobar[]

\n\t *

foo{}bar

->

foo{}bar

\n\t *

foob{}ar

->

foob[]ar

\n\t *

fo{oba}r

->

foobar

\n\t *\n\t * **Note:** {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n\t *\n\t * **Note:** Difference between {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes breakAttributes} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakContainer breakContainer} is that `breakAttributes` breaks all\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of given `position`,\n\t * up to the first encountered {@link module:engine/view/containerelement~ContainerElement container element}.\n\t * `breakContainer` assumes that given `position` is directly in container element and breaks that container element.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container`\n\t * when {@link module:engine/view/range~Range#start start}\n\t * and {@link module:engine/view/range~Range#end end} positions of a passed range are not placed inside same parent container.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element`\n\t * when trying to break attributes\n\t * inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element`\n\t * when trying to break attributes\n\t * inside {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#breakContainer\n\t * @param {module:engine/view/position~Position|module:engine/view/range~Range} positionOrRange Position where\n\t * to break attribute elements.\n\t * @returns {module:engine/view/position~Position|module:engine/view/range~Range} New position or range, after breaking the attribute\n\t * elements.\n\t */\n\tbreakAttributes( positionOrRange ) {\n\t\tif ( positionOrRange instanceof Position ) {\n\t\t\treturn this._breakAttributes( positionOrRange );\n\t\t} else {\n\t\t\treturn this._breakAttributesRange( positionOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Breaks {@link module:engine/view/containerelement~ContainerElement container view element} into two, at the given position. Position\n\t * has to be directly inside container element and cannot be in root. Does not break if position is at the beginning\n\t * or at the end of it's parent element.\n\t *\n\t *

foo^bar

->

foo

bar

\n\t *

foo

^

bar

->

foo

bar

\n\t *

^foobar

-> ^

foobar

\n\t *

foobar^

->

foobar

^\n\t *\n\t * **Note:** Difference between {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes breakAttributes} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakContainer breakContainer} is that `breakAttributes` breaks all\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of given `position`,\n\t * up to the first encountered {@link module:engine/view/containerelement~ContainerElement container element}.\n\t * `breakContainer` assumes that given `position` is directly in container element and breaks that container element.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#breakAttributes\n\t * @param {module:engine/view/position~Position} position Position where to break element.\n\t * @returns {module:engine/view/position~Position} Position between broken elements. If element has not been broken,\n\t * the returned position is placed either before it or after it.\n\t */\n\tbreakContainer( position ) {\n\t\tconst element = position.parent;\n\n\t\tif ( !( element.is( 'containerElement' ) ) ) {\n\t\t\t/**\n\t\t\t * Trying to break an element which is not a container element.\n\t\t\t *\n\t\t\t * @error view-writer-break-non-container-element\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-writer-break-non-container-element: Trying to break an element which is not a container element.'\n\t\t\t);\n\t\t}\n\n\t\tif ( !element.parent ) {\n\t\t\t/**\n\t\t\t * Trying to break root element.\n\t\t\t *\n\t\t\t * @error view-writer-break-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-break-root: Trying to break root element.' );\n\t\t}\n\n\t\tif ( position.isAtStart ) {\n\t\t\treturn Position._createBefore( element );\n\t\t} else if ( !position.isAtEnd ) {\n\t\t\tconst newElement = element._clone( false );\n\n\t\t\tthis.insert( Position._createAfter( element ), newElement );\n\n\t\t\tconst sourceRange = new Range( position, Position._createAt( element, 'end' ) );\n\t\t\tconst targetPosition = new Position( newElement, 0 );\n\n\t\t\tthis.move( sourceRange, targetPosition );\n\t\t}\n\n\t\treturn Position._createAfter( element );\n\t}\n\n\t/**\n\t * Merges {@link module:engine/view/attributeelement~AttributeElement attribute elements}. It also merges text nodes if needed.\n\t * Only {@link module:engine/view/attributeelement~AttributeElement#isSimilar similar} attribute elements can be merged.\n\t *\n\t * In following examples `

` is a container and `` is an attribute element:\n\t *\n\t *

foo[]bar

->

foo{}bar

\n\t *

foo[]bar

->

foo{}bar

\n\t *

a[]b

->

a[]b

\n\t *\n\t * It will also take care about empty attributes when merging:\n\t *\n\t *

[]

->

[]

\n\t *

foo[]bar

->

foo{}bar

\n\t *\n\t * **Note:** Difference between {@link module:engine/view/downcastwriter~DowncastWriter#mergeAttributes mergeAttributes} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#mergeContainers mergeContainers} is that `mergeAttributes` merges two\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}\n\t * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#mergeContainers\n\t * @param {module:engine/view/position~Position} position Merge position.\n\t * @returns {module:engine/view/position~Position} Position after merge.\n\t */\n\tmergeAttributes( position ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// When inside text node - nothing to merge.\n\t\tif ( positionParent.is( 'text' ) ) {\n\t\t\treturn position;\n\t\t}\n\n\t\t// When inside empty attribute - remove it.\n\t\tif ( positionParent.is( 'attributeElement' ) && positionParent.childCount === 0 ) {\n\t\t\tconst parent = positionParent.parent;\n\t\t\tconst offset = positionParent.index;\n\n\t\t\tpositionParent._remove();\n\t\t\tthis._removeFromClonedElementsGroup( positionParent );\n\n\t\t\treturn this.mergeAttributes( new Position( parent, offset ) );\n\t\t}\n\n\t\tconst nodeBefore = positionParent.getChild( positionOffset - 1 );\n\t\tconst nodeAfter = positionParent.getChild( positionOffset );\n\n\t\t// Position should be placed between two nodes.\n\t\tif ( !nodeBefore || !nodeAfter ) {\n\t\t\treturn position;\n\t\t}\n\n\t\t// When position is between two text nodes.\n\t\tif ( nodeBefore.is( 'text' ) && nodeAfter.is( 'text' ) ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\t\t// When position is between two same attribute elements.\n\t\telse if ( nodeBefore.is( 'attributeElement' ) && nodeAfter.is( 'attributeElement' ) && nodeBefore.isSimilar( nodeAfter ) ) {\n\t\t\t// Move all children nodes from node placed after selection and remove that node.\n\t\t\tconst count = nodeBefore.childCount;\n\t\t\tnodeBefore._appendChild( nodeAfter.getChildren() );\n\n\t\t\tnodeAfter._remove();\n\t\t\tthis._removeFromClonedElementsGroup( nodeAfter );\n\n\t\t\t// New position is located inside the first node, before new nodes.\n\t\t\t// Call this method recursively to merge again if needed.\n\t\t\treturn this.mergeAttributes( new Position( nodeBefore, count ) );\n\t\t}\n\n\t\treturn position;\n\t}\n\n\t/**\n\t * Merges two {@link module:engine/view/containerelement~ContainerElement container elements} that are before and after given position.\n\t * Precisely, the element after the position is removed and it's contents are moved to element before the position.\n\t *\n\t *

foo

^

bar

->

foo^bar

\n\t *
foo
^

bar

->
foo^bar
\n\t *\n\t * **Note:** Difference between {@link module:engine/view/downcastwriter~DowncastWriter#mergeAttributes mergeAttributes} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#mergeContainers mergeContainers} is that `mergeAttributes` merges two\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}\n\t * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#mergeAttributes\n\t * @param {module:engine/view/position~Position} position Merge position.\n\t * @returns {module:engine/view/position~Position} Position after merge.\n\t */\n\tmergeContainers( position ) {\n\t\tconst prev = position.nodeBefore;\n\t\tconst next = position.nodeAfter;\n\n\t\tif ( !prev || !next || !prev.is( 'containerElement' ) || !next.is( 'containerElement' ) ) {\n\t\t\t/**\n\t\t\t * Element before and after given position cannot be merged.\n\t\t\t *\n\t\t\t * @error view-writer-merge-containers-invalid-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-merge-containers-invalid-position: ' +\n\t\t\t\t'Element before and after given position cannot be merged.' );\n\t\t}\n\n\t\tconst lastChild = prev.getChild( prev.childCount - 1 );\n\t\tconst newPosition = lastChild instanceof Text ? Position._createAt( lastChild, 'end' ) : Position._createAt( prev, 'end' );\n\n\t\tthis.move( Range._createIn( next ), Position._createAt( prev, 'end' ) );\n\t\tthis.remove( Range._createOn( next ) );\n\n\t\treturn newPosition;\n\t}\n\n\t/**\n\t * Insert node or nodes at specified position. Takes care about breaking attributes before insertion\n\t * and merging them afterwards.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n\t * contains instances that are not {@link module:engine/view/text~Text Texts},\n\t * {@link module:engine/view/attributeelement~AttributeElement AttributeElements},\n\t * {@link module:engine/view/containerelement~ContainerElement ContainerElements},\n\t * {@link module:engine/view/emptyelement~EmptyElement EmptyElements} or\n\t * {@link module:engine/view/uielement~UIElement UIElements}.\n\t *\n\t * @param {module:engine/view/position~Position} position Insertion position.\n\t * @param {module:engine/view/text~Text|module:engine/view/attributeelement~AttributeElement|\n\t * module:engine/view/containerelement~ContainerElement|module:engine/view/emptyelement~EmptyElement|\n\t * module:engine/view/uielement~UIElement|Iterable.} nodes Node or nodes to insert.\n\t * @returns {module:engine/view/range~Range} Range around inserted nodes.\n\t */\n\tinsert( position, nodes ) {\n\t\tnodes = isIterable( nodes ) ? [ ...nodes ] : [ nodes ];\n\n\t\t// Check if nodes to insert are instances of AttributeElements, ContainerElements, EmptyElements, UIElements or Text.\n\t\tvalidateNodesToInsert( nodes );\n\n\t\tconst container = getParentContainer( position );\n\n\t\tif ( !container ) {\n\t\t\t/**\n\t\t\t * Position's parent container cannot be found.\n\t\t\t *\n\t\t\t * @error view-writer-invalid-position-container\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-invalid-position-container' );\n\t\t}\n\n\t\tconst insertionPosition = this._breakAttributes( position, true );\n\t\tconst length = container._insertChild( insertionPosition.offset, nodes );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tthis._addToClonedElementsGroup( node );\n\t\t}\n\n\t\tconst endPosition = insertionPosition.getShiftedBy( length );\n\t\tconst start = this.mergeAttributes( insertionPosition );\n\n\t\t// When no nodes were inserted - return collapsed range.\n\t\tif ( length === 0 ) {\n\t\t\treturn new Range( start, start );\n\t\t} else {\n\t\t\t// If start position was merged - move end position.\n\t\t\tif ( !start.isEqual( insertionPosition ) ) {\n\t\t\t\tendPosition.offset--;\n\t\t\t}\n\n\t\t\tconst end = this.mergeAttributes( endPosition );\n\n\t\t\treturn new Range( start, end );\n\t\t}\n\t}\n\n\t/**\n\t * Removes provided range from the container.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range|module:engine/view/item~Item} rangeOrItem Range to remove from container\n\t * or an {@link module:engine/view/item~Item item} to remove. If range is provided, after removing, it will be updated\n\t * to a collapsed range showing the new position.\n\t * @returns {module:engine/view/documentfragment~DocumentFragment} Document fragment containing removed nodes.\n\t */\n\tremove( rangeOrItem ) {\n\t\tconst range = rangeOrItem instanceof Range ? rangeOrItem : Range._createOn( rangeOrItem );\n\n\t\tvalidateRangeContainer( range );\n\n\t\t// If range is collapsed - nothing to remove.\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn new DocumentFragment();\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\t\tconst parentContainer = breakStart.parent;\n\n\t\tconst count = breakEnd.offset - breakStart.offset;\n\n\t\t// Remove nodes in range.\n\t\tconst removed = parentContainer._removeChildren( breakStart.offset, count );\n\n\t\tfor ( const node of removed ) {\n\t\t\tthis._removeFromClonedElementsGroup( node );\n\t\t}\n\n\t\t// Merge after removing.\n\t\tconst mergePosition = this.mergeAttributes( breakStart );\n\t\trange.start = mergePosition;\n\t\trange.end = mergePosition.clone();\n\n\t\t// Return removed nodes.\n\t\treturn new DocumentFragment( removed );\n\t}\n\n\t/**\n\t * Removes matching elements from given range.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to clear.\n\t * @param {module:engine/view/element~Element} element Element to remove.\n\t */\n\tclear( range, element ) {\n\t\tvalidateRangeContainer( range );\n\n\t\t// Create walker on given range.\n\t\t// We walk backward because when we remove element during walk it modifies range end position.\n\t\tconst walker = range.getWalker( {\n\t\t\tdirection: 'backward',\n\t\t\tignoreElementEnd: true\n\t\t} );\n\n\t\t// Let's walk.\n\t\tfor ( const current of walker ) {\n\t\t\tconst item = current.item;\n\t\t\tlet rangeToRemove;\n\n\t\t\t// When current item matches to the given element.\n\t\t\tif ( item.is( 'element' ) && element.isSimilar( item ) ) {\n\t\t\t\t// Create range on this element.\n\t\t\t\trangeToRemove = Range._createOn( item );\n\t\t\t\t// When range starts inside Text or TextProxy element.\n\t\t\t} else if ( !current.nextPosition.isAfter( range.start ) && item.is( 'textProxy' ) ) {\n\t\t\t\t// We need to check if parent of this text matches to given element.\n\t\t\t\tconst parentElement = item.getAncestors().find( ancestor => {\n\t\t\t\t\treturn ancestor.is( 'element' ) && element.isSimilar( ancestor );\n\t\t\t\t} );\n\n\t\t\t\t// If it is then create range inside this element.\n\t\t\t\tif ( parentElement ) {\n\t\t\t\t\trangeToRemove = Range._createIn( parentElement );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we have found element to remove.\n\t\t\tif ( rangeToRemove ) {\n\t\t\t\t// We need to check if element range stick out of the given range and truncate if it is.\n\t\t\t\tif ( rangeToRemove.end.isAfter( range.end ) ) {\n\t\t\t\t\trangeToRemove.end = range.end;\n\t\t\t\t}\n\n\t\t\t\tif ( rangeToRemove.start.isBefore( range.start ) ) {\n\t\t\t\t\trangeToRemove.start = range.start;\n\t\t\t\t}\n\n\t\t\t\t// At the end we remove range with found element.\n\t\t\t\tthis.remove( rangeToRemove );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Moves nodes from provided range to target position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} sourceRange Range containing nodes to move.\n\t * @param {module:engine/view/position~Position} targetPosition Position to insert.\n\t * @returns {module:engine/view/range~Range} Range in target container. Inserted nodes are placed between\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions.\n\t */\n\tmove( sourceRange, targetPosition ) {\n\t\tlet nodes;\n\n\t\tif ( targetPosition.isAfter( sourceRange.end ) ) {\n\t\t\ttargetPosition = this._breakAttributes( targetPosition, true );\n\n\t\t\tconst parent = targetPosition.parent;\n\t\t\tconst countBefore = parent.childCount;\n\n\t\t\tsourceRange = this._breakAttributesRange( sourceRange, true );\n\n\t\t\tnodes = this.remove( sourceRange );\n\n\t\t\ttargetPosition.offset += ( parent.childCount - countBefore );\n\t\t} else {\n\t\t\tnodes = this.remove( sourceRange );\n\t\t}\n\n\t\treturn this.insert( targetPosition, nodes );\n\t}\n\n\t/**\n * Wraps elements within range with provided {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n * If a collapsed range is provided, it will be wrapped only if it is equal to view selection.\n *\n * If a collapsed range was passed and is same as selection, the selection\n * will be moved to the inside of the wrapped attribute element.\n *\n * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-invalid-range-container`\n * when {@link module:engine/view/range~Range#start}\n * and {@link module:engine/view/range~Range#end} positions are not placed inside same parent container.\n *\n * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n *\n * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-nonselection-collapsed-range` when passed range\n * is collapsed and different than view selection.\n *\n * @param {module:engine/view/range~Range} range Range to wrap.\n * @param {module:engine/view/attributeelement~AttributeElement} attribute Attribute element to use as wrapper.\n * @returns {module:engine/view/range~Range} range Range after wrapping, spanning over wrapping attribute element.\n */\n\twrap( range, attribute ) {\n\t\tif ( !( attribute instanceof AttributeElement ) ) {\n\t\t\tthrow new CKEditorError( 'view-writer-wrap-invalid-attribute' );\n\t\t}\n\n\t\tvalidateRangeContainer( range );\n\n\t\tif ( !range.isCollapsed ) {\n\t\t\t// Non-collapsed range. Wrap it with the attribute element.\n\t\t\treturn this._wrapRange( range, attribute );\n\t\t} else {\n\t\t\t// Collapsed range. Wrap position.\n\t\t\tlet position = range.start;\n\n\t\t\tif ( position.parent.is( 'element' ) && !_hasNonUiChildren( position.parent ) ) {\n\t\t\t\tposition = position.getLastMatchingPosition( value => value.item.is( 'uiElement' ) );\n\t\t\t}\n\n\t\t\tposition = this._wrapPosition( position, attribute );\n\t\t\tconst viewSelection = this.document.selection;\n\n\t\t\t// If wrapping position is equal to view selection, move view selection inside wrapping attribute element.\n\t\t\tif ( viewSelection.isCollapsed && viewSelection.getFirstPosition().isEqual( range.start ) ) {\n\t\t\t\tthis.setSelection( position );\n\t\t\t}\n\n\t\t\treturn new Range( position );\n\t\t}\n\t}\n\n\t/**\n\t * Unwraps nodes within provided range from attribute element.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t */\n\tunwrap( range, attribute ) {\n\t\tif ( !( attribute instanceof AttributeElement ) ) {\n\t\t\t/**\n\t\t\t * Attribute element need to be instance of attribute element.\n\t\t\t *\n\t\t\t * @error view-writer-unwrap-invalid-attribute\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-unwrap-invalid-attribute' );\n\t\t}\n\n\t\tvalidateRangeContainer( range );\n\n\t\t// If range is collapsed - nothing to unwrap.\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn range;\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\n\t\t// Range around one element - check if AttributeElement can be unwrapped partially when it's not similar.\n\t\t// For example:\n\t\t// unwrap with:\t

result: \n\t\tif ( breakEnd.isEqual( breakStart.getShiftedBy( 1 ) ) ) {\n\t\t\tconst node = breakStart.nodeAfter;\n\n\t\t\t// Unwrap single attribute element.\n\t\t\tif ( !attribute.isSimilar( node ) && node instanceof AttributeElement && this._unwrapAttributeElement( attribute, node ) ) {\n\t\t\t\tconst start = this.mergeAttributes( breakStart );\n\n\t\t\t\tif ( !start.isEqual( breakStart ) ) {\n\t\t\t\t\tbreakEnd.offset--;\n\t\t\t\t}\n\n\t\t\t\tconst end = this.mergeAttributes( breakEnd );\n\n\t\t\t\treturn new Range( start, end );\n\t\t\t}\n\t\t}\n\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Unwrap children located between break points.\n\t\tconst newRange = this._unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Renames element by creating a copy of renamed element but with changed name and then moving contents of the\n\t * old element to the new one. Keep in mind that this will invalidate all {@link module:engine/view/position~Position positions} which\n\t * has renamed element as {@link module:engine/view/position~Position#parent a parent}.\n\t *\n\t * New element has to be created because `Element#tagName` property in DOM is readonly.\n\t *\n\t * Since this function creates a new element and removes the given one, the new element is returned to keep reference.\n\t *\n\t * @param {String} newName New name for element.\n\t * @param {module:engine/view/containerelement~ContainerElement} viewElement Element to be renamed.\n\t */\n\trename( newName, viewElement ) {\n\t\tconst newElement = new ContainerElement( newName, viewElement.getAttributes() );\n\n\t\tthis.insert( Position._createAfter( viewElement ), newElement );\n\t\tthis.move( Range._createIn( viewElement ), Position._createAt( newElement, 0 ) );\n\t\tthis.remove( Range._createOn( viewElement ) );\n\n\t\treturn newElement;\n\t}\n\n\t/**\n\t * Cleans up memory by removing obsolete cloned elements group from the writer.\n\t *\n\t * Should be used whenever all {@link module:engine/view/attributeelement~AttributeElement attribute elements}\n\t * with the same {@link module:engine/view/attributeelement~AttributeElement#id id} are going to be removed from the view and\n\t * the group will no longer be needed.\n\t *\n\t * Cloned elements group are not removed automatically in case if the group is still needed after all its elements\n\t * were removed from the view.\n\t *\n\t * Keep in mind that group names are equal to the `id` property of the attribute element.\n\t *\n\t * @param {String} groupName Name of the group to clear.\n\t */\n\tclearClonedElementsGroup( groupName ) {\n\t\tthis._cloneGroups.delete( groupName );\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link #createPositionBefore},\n\t * * {@link #createPositionAfter},\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tcreatePositionAt( itemOrPosition, offset ) {\n\t\treturn Position._createAt( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tcreatePositionAfter( item ) {\n\t\treturn Position._createAfter( item );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tcreatePositionBefore( item ) {\n\t\treturn Position._createBefore( item );\n\t}\n\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** This factory method creates it's own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRange( start, end ) {\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRangeOn( item ) {\n\t\treturn Range._createOn( item );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRangeIn( element ) {\n\t\treturn Range._createIn( element );\n\t}\n\n\t/**\n\t Creates new {@link module:engine/view/selection~Selection} instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = writer.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = writer.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tconst selection = writer.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = writer.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = writer.createSelection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tconst selection = writer.createSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = writer.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = writer.createSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t * @returns {module:engine/view/selection~Selection}\n\t */\n\tcreateSelection( selectable, placeOrOffset, options ) {\n\t\treturn new Selection( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Wraps children with provided `attribute`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be wrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} attribute\n\t */\n\t_wrapChildren( parent, startOffset, endOffset, attribute ) {\n\t\tlet i = startOffset;\n\t\tconst wrapPositions = [];\n\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\t\t\tconst isText = child.is( 'text' );\n\t\t\tconst isAttribute = child.is( 'attributeElement' );\n\t\t\tconst isEmpty = child.is( 'emptyElement' );\n\t\t\tconst isUI = child.is( 'uiElement' );\n\n\t\t\t// Wrap text, empty elements, ui elements or attributes with higher or equal priority.\n\t\t\tif ( isText || isEmpty || isUI || ( isAttribute && shouldABeOutsideB( attribute, child ) ) ) {\n\t\t\t\t// Clone attribute.\n\t\t\t\tconst newAttribute = attribute._clone();\n\n\t\t\t\t// Wrap current node with new attribute.\n\t\t\t\tchild._remove();\n\t\t\t\tnewAttribute._appendChild( child );\n\n\t\t\t\tparent._insertChild( i, newAttribute );\n\t\t\t\tthis._addToClonedElementsGroup( newAttribute );\n\n\t\t\t\twrapPositions.push(\tnew Position( parent, i ) );\n\t\t\t}\n\t\t\t// If other nested attribute is found start wrapping there.\n\t\t\telse if ( isAttribute ) {\n\t\t\t\tthis._wrapChildren( child, 0, child.childCount, attribute );\n\t\t\t}\n\n\t\t\ti++;\n\t\t}\n\n\t\t// Merge at each wrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of wrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range._createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Unwraps children from provided `attribute`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} attribute\n\t */\n\t_unwrapChildren( parent, startOffset, endOffset, attribute ) {\n\t\tlet i = startOffset;\n\t\tconst unwrapPositions = [];\n\n\t\t// Iterate over each element between provided offsets inside parent.\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\n\t\t\t// If attributes are the similar, then unwrap.\n\t\t\tif ( child.isSimilar( attribute ) ) {\n\t\t\t\tconst unwrapped = child.getChildren();\n\t\t\t\tconst count = child.childCount;\n\n\t\t\t\t// Replace wrapper element with its children\n\t\t\t\tchild._remove();\n\t\t\t\tparent._insertChild( i, unwrapped );\n\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\n\t\t\t\t// Save start and end position of moved items.\n\t\t\t\tunwrapPositions.push(\n\t\t\t\t\tnew Position( parent, i ),\n\t\t\t\t\tnew Position( parent, i + count )\n\t\t\t\t);\n\n\t\t\t\t// Skip elements that were unwrapped. Assuming that there won't be another element to unwrap in child\n\t\t\t\t// elements.\n\t\t\t\ti += count;\n\t\t\t\tendOffset += count - 1;\n\t\t\t} else {\n\t\t\t\t// If other nested attribute is found start unwrapping there.\n\t\t\t\tif ( child.is( 'attributeElement' ) ) {\n\t\t\t\t\tthis._unwrapChildren( child, 0, child.childCount, attribute );\n\t\t\t\t}\n\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\t// Merge at each unwrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of unwrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset || position.offset == endOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range._createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Helper function for `view.writer.wrap`. Wraps range with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/range~Range} New range after wrapping, spanning over wrapping attribute element.\n\t */\n\t_wrapRange( range, attribute ) {\n\t\t// Range is inside single attribute and spans on all children.\n\t\tif ( rangeSpansOnAllChildren( range ) && this._wrapAttributeElement( attribute, range.start.parent ) ) {\n\t\t\tconst parent = range.start.parent;\n\n\t\t\tconst end = this.mergeAttributes( Position._createAfter( parent ) );\n\t\t\tconst start = this.mergeAttributes( Position._createBefore( parent ) );\n\n\t\t\treturn new Range( start, end );\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\n\t\t// Range around one element.\n\t\tif ( breakEnd.isEqual( breakStart.getShiftedBy( 1 ) ) ) {\n\t\t\tconst node = breakStart.nodeAfter;\n\n\t\t\tif ( node instanceof AttributeElement && this._wrapAttributeElement( attribute, node ) ) {\n\t\t\t\tconst start = this.mergeAttributes( breakStart );\n\n\t\t\t\tif ( !start.isEqual( breakStart ) ) {\n\t\t\t\t\tbreakEnd.offset--;\n\t\t\t\t}\n\n\t\t\t\tconst end = this.mergeAttributes( breakEnd );\n\n\t\t\t\treturn new Range( start, end );\n\t\t\t}\n\t\t}\n\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Unwrap children located between break points.\n\t\tconst unwrappedRange = this._unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Wrap all children with attribute.\n\t\tconst newRange = this._wrapChildren( parentContainer, unwrappedRange.start.offset, unwrappedRange.end.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Helper function for {@link #wrap}. Wraps position with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/position~Position} New position after wrapping.\n\t */\n\t_wrapPosition( position, attribute ) {\n\t\t// Return same position when trying to wrap with attribute similar to position parent.\n\t\tif ( attribute.isSimilar( position.parent ) ) {\n\t\t\treturn movePositionToTextNode( position.clone() );\n\t\t}\n\n\t\t// When position is inside text node - break it and place new position between two text nodes.\n\t\tif ( position.parent.is( 'text' ) ) {\n\t\t\tposition = breakTextNode( position );\n\t\t}\n\n\t\t// Create fake element that will represent position, and will not be merged with other attributes.\n\t\tconst fakePosition = this.createAttributeElement();\n\t\tfakePosition._priority = Number.POSITIVE_INFINITY;\n\t\tfakePosition.isSimilar = () => false;\n\n\t\t// Insert fake element in position location.\n\t\tposition.parent._insertChild( position.offset, fakePosition );\n\n\t\t// Range around inserted fake attribute element.\n\t\tconst wrapRange = new Range( position, position.getShiftedBy( 1 ) );\n\n\t\t// Wrap fake element with attribute (it will also merge if possible).\n\t\tthis.wrap( wrapRange, attribute );\n\n\t\t// Remove fake element and place new position there.\n\t\tconst newPosition = new Position( fakePosition.parent, fakePosition.index );\n\t\tfakePosition._remove();\n\n\t\t// If position is placed between text nodes - merge them and return position inside.\n\t\tconst nodeBefore = newPosition.nodeBefore;\n\t\tconst nodeAfter = newPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof Text && nodeAfter instanceof Text ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\n\t\t// If position is next to text node - move position inside.\n\t\treturn movePositionToTextNode( newPosition );\n\t}\n\n\t/**\n\t * \tWraps one {@link module:engine/view/attributeelement~AttributeElement AttributeElement} into another by\n\t * \tmerging them if possible. When merging is possible - all attributes, styles and classes are moved from wrapper\n\t * \telement to element being wrapped.\n\t *\n\t * \t@private\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} toWrap AttributeElement to wrap using wrapper element.\n\t * \t@returns {Boolean} Returns `true` if elements are merged.\n\t */\n\t_wrapAttributeElement( wrapper, toWrap ) {\n\t\tif ( !canBeJoined( wrapper, toWrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't merge if name or priority differs.\n\t\tif ( wrapper.name !== toWrap.name || wrapper.priority !== toWrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes can be merged.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are different we cannot wrap.\n\t\t\tif ( toWrap.hasAttribute( key ) && toWrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles can be merged.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( toWrap.hasStyle( key ) && toWrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Move all attributes/classes/styles from wrapper to wrapped AttributeElement.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// Move only these attributes that are not present - other are similar.\n\t\t\tif ( !toWrap.hasAttribute( key ) ) {\n\t\t\t\tthis.setAttribute( key, wrapper.getAttribute( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( !toWrap.hasStyle( key ) ) {\n\t\t\t\tthis.setStyle( key, wrapper.getStyle( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getClassNames() ) {\n\t\t\tif ( !toWrap.hasClass( key ) ) {\n\t\t\t\tthis.addClass( key, toWrap );\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Unwraps {@link module:engine/view/attributeelement~AttributeElement AttributeElement} from another by removing\n\t * corresponding attributes, classes and styles. All attributes, classes and styles from wrapper should be present\n\t * inside element being unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * @param {module:engine/view/attributeelement~AttributeElement} toUnwrap AttributeElement to unwrap using wrapper element.\n\t * @returns {Boolean} Returns `true` if elements are unwrapped.\n\t **/\n\t_unwrapAttributeElement( wrapper, toUnwrap ) {\n\t\tif ( !canBeJoined( wrapper, toUnwrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't unwrap if name or priority differs.\n\t\tif ( wrapper.name !== toUnwrap.name || wrapper.priority !== toUnwrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper attributes.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasAttribute( key ) || toUnwrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper classes.\n\t\tif ( !toUnwrap.hasClass( ...wrapper.getClassNames() ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper styles.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\t// If some styles are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasStyle( key ) || toUnwrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Remove all wrapper's attributes from unwrapped element.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tthis.removeAttribute( key, toUnwrap );\n\t\t}\n\n\t\t// Remove all wrapper's classes from unwrapped element.\n\t\tthis.removeClass( Array.from( wrapper.getClassNames() ), toUnwrap );\n\n\t\t// Remove all wrapper's styles from unwrapped element.\n\t\tthis.removeStyle( Array.from( wrapper.getStyleNames() ), toUnwrap );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Helper function used by other `DowncastWriter` methods. Breaks attribute elements at the boundaries of given range.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range Range which `start` and `end` positions will be used to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/range~Range} New range with located at break positions.\n\t */\n\t_breakAttributesRange( range, forceSplitText = false ) {\n\t\tconst rangeStart = range.start;\n\t\tconst rangeEnd = range.end;\n\n\t\tvalidateRangeContainer( range );\n\n\t\t// Break at the collapsed position. Return new collapsed range.\n\t\tif ( range.isCollapsed ) {\n\t\t\tconst position = this._breakAttributes( range.start, forceSplitText );\n\n\t\t\treturn new Range( position, position );\n\t\t}\n\n\t\tconst breakEnd = this._breakAttributes( rangeEnd, forceSplitText );\n\t\tconst count = breakEnd.parent.childCount;\n\t\tconst breakStart = this._breakAttributes( rangeStart, forceSplitText );\n\n\t\t// Calculate new break end offset.\n\t\tbreakEnd.offset += breakEnd.parent.childCount - count;\n\n\t\treturn new Range( breakStart, breakEnd );\n\t}\n\n\t/**\n\t * Helper function used by other `DowncastWriter` methods. Breaks attribute elements at given position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element` when break position\n\t * is placed inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element` when break position\n\t * is placed inside {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position Position where to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/position~Position} New position after breaking the attributes.\n\t */\n\t_breakAttributes( position, forceSplitText = false ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// If position is placed inside EmptyElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'emptyElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break inside EmptyElement instance.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-empty-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-empty-element' );\n\t\t}\n\n\t\t// If position is placed inside UIElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'uiElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break inside UIElement instance.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-ui-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-ui-element' );\n\t\t}\n\n\t\t// There are no attributes to break and text nodes breaking is not forced.\n\t\tif ( !forceSplitText && positionParent.is( 'text' ) && isContainerOrFragment( positionParent.parent ) ) {\n\t\t\treturn position.clone();\n\t\t}\n\n\t\t// Position's parent is container, so no attributes to break.\n\t\tif ( isContainerOrFragment( positionParent ) ) {\n\t\t\treturn position.clone();\n\t\t}\n\n\t\t// Break text and start again in new position.\n\t\tif ( positionParent.is( 'text' ) ) {\n\t\t\treturn this._breakAttributes( breakTextNode( position ), forceSplitText );\n\t\t}\n\n\t\tconst length = positionParent.childCount;\n\n\t\t//

foobar{}

\n\t\t//

foobar[]

\n\t\t//

foobar[]

\n\t\tif ( positionOffset == length ) {\n\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index + 1 );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t} else\n\t\t//

foo{}bar

\n\t\t//

foo[]bar

\n\t\t//

foo{}bar

\n\t\tif ( positionOffset === 0 ) {\n\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t}\n\t\t//

foob{}ar

\n\t\t//

foob[]ar

\n\t\t//

foob[]ar

\n\t\t//

foob[]ar

\n\t\telse {\n\t\t\tconst offsetAfter = positionParent.index + 1;\n\n\t\t\t// Break element.\n\t\t\tconst clonedNode = positionParent._clone();\n\n\t\t\t// Insert cloned node to position's parent node.\n\t\t\tpositionParent.parent._insertChild( offsetAfter, clonedNode );\n\t\t\tthis._addToClonedElementsGroup( clonedNode );\n\n\t\t\t// Get nodes to move.\n\t\t\tconst count = positionParent.childCount - positionOffset;\n\t\t\tconst nodesToMove = positionParent._removeChildren( positionOffset, count );\n\n\t\t\t// Move nodes to cloned node.\n\t\t\tclonedNode._appendChild( nodesToMove );\n\n\t\t\t// Create new position to work on.\n\t\t\tconst newPosition = new Position( positionParent.parent, offsetAfter );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t}\n\t}\n\n\t/**\n\t * Stores the information that an {@link module:engine/view/attributeelement~AttributeElement attribute element} was\n\t * added to the tree. Saves the reference to the group in the given element and updates the group, so other elements\n\t * from the group now keep a reference to the given attribute element.\n\t *\n\t * The clones group can be obtained using {@link module:engine/view/attributeelement~AttributeElement#getElementsWithSameId}.\n\t *\n\t * Does nothing if added element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to save.\n\t */\n\t_addToClonedElementsGroup( element ) {\n\t\t// Add only if the element is in document tree.\n\t\tif ( !element.root.is( 'rootElement' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Traverse the element's children recursively to find other attribute elements that also might got inserted.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._addToClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlet group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\tgroup = new Set();\n\t\t\tthis._cloneGroups.set( id, group );\n\t\t}\n\n\t\tgroup.add( element );\n\t\telement._clonesGroup = group;\n\t}\n\n\t/**\n\t * Removes all the information about the given {@link module:engine/view/attributeelement~AttributeElement attribute element}\n\t * from its clones group.\n\t *\n\t * Keep in mind, that the element will still keep a reference to the group (but the group will not keep a reference to it).\n\t * This allows to reference the whole group even if the element was already removed from the tree.\n\t *\n\t * Does nothing if the element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to remove.\n\t */\n\t_removeFromClonedElementsGroup( element ) {\n\t\t// Traverse the element's children recursively to find other attribute elements that also got removed.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\treturn;\n\t\t}\n\n\t\tgroup.delete( element );\n\t\t// Not removing group from element on purpose!\n\t\t// If other parts of code have reference to this element, they will be able to get references to other elements from the group.\n\t}\n}\n\n// Helper function for `view.writer.wrap`. Checks if given element has any children that are not ui elements.\nfunction _hasNonUiChildren( parent ) {\n\treturn Array.from( parent.getChildren() ).some( child => !child.is( 'uiElement' ) );\n}\n\n/**\n * Attribute element need to be instance of attribute element.\n *\n * @error view-writer-wrap-invalid-attribute\n */\n\n// Returns first parent container of specified {@link module:engine/view/position~Position Position}.\n// Position's parent node is checked as first, then next parents are checked.\n// Note that {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n//\n// @param {module:engine/view/position~Position} position Position used as a start point to locate parent container.\n// @returns {module:engine/view/containerelement~ContainerElement|module:engine/view/documentfragment~DocumentFragment|undefined}\n// Parent container element or `undefined` if container is not found.\nfunction getParentContainer( position ) {\n\tlet parent = position.parent;\n\n\twhile ( !isContainerOrFragment( parent ) ) {\n\t\tif ( !parent ) {\n\t\t\treturn undefined;\n\t\t}\n\t\tparent = parent.parent;\n\t}\n\n\treturn parent;\n}\n\n// Checks if first {@link module:engine/view/attributeelement~AttributeElement AttributeElement} provided to the function\n// can be wrapped otuside second element. It is done by comparing elements'\n// {@link module:engine/view/attributeelement~AttributeElement#priority priorities}, if both have same priority\n// {@link module:engine/view/element~Element#getIdentity identities} are compared.\n//\n// @param {module:engine/view/attributeelement~AttributeElement} a\n// @param {module:engine/view/attributeelement~AttributeElement} b\n// @returns {Boolean}\nfunction shouldABeOutsideB( a, b ) {\n\tif ( a.priority < b.priority ) {\n\t\treturn true;\n\t} else if ( a.priority > b.priority ) {\n\t\treturn false;\n\t}\n\n\t// When priorities are equal and names are different - use identities.\n\treturn a.getIdentity() < b.getIdentity();\n}\n\n// Returns new position that is moved to near text node. Returns same position if there is no text node before of after\n// specified position.\n//\n//\t\t

foo[]

->

foo{}

\n//\t\t

[]foo

->

{}foo

\n//\n// @param {module:engine/view/position~Position} position\n// @returns {module:engine/view/position~Position} Position located inside text node or same position if there is no text nodes\n// before or after position location.\nfunction movePositionToTextNode( position ) {\n\tconst nodeBefore = position.nodeBefore;\n\n\tif ( nodeBefore && nodeBefore.is( 'text' ) ) {\n\t\treturn new Position( nodeBefore, nodeBefore.data.length );\n\t}\n\n\tconst nodeAfter = position.nodeAfter;\n\n\tif ( nodeAfter && nodeAfter.is( 'text' ) ) {\n\t\treturn new Position( nodeAfter, 0 );\n\t}\n\n\treturn position;\n}\n\n// Breaks text node into two text nodes when possible.\n//\n//\t\t

foo{}bar

->

foo[]bar

\n//\t\t

{}foobar

->

[]foobar

\n//\t\t

foobar{}

->

foobar[]

\n//\n// @param {module:engine/view/position~Position} position Position that need to be placed inside text node.\n// @returns {module:engine/view/position~Position} New position after breaking text node.\nfunction breakTextNode( position ) {\n\tif ( position.offset == position.parent.data.length ) {\n\t\treturn new Position( position.parent.parent, position.parent.index + 1 );\n\t}\n\n\tif ( position.offset === 0 ) {\n\t\treturn new Position( position.parent.parent, position.parent.index );\n\t}\n\n\t// Get part of the text that need to be moved.\n\tconst textToMove = position.parent.data.slice( position.offset );\n\n\t// Leave rest of the text in position's parent.\n\tposition.parent._data = position.parent.data.slice( 0, position.offset );\n\n\t// Insert new text node after position's parent text node.\n\tposition.parent.parent._insertChild( position.parent.index + 1, new Text( textToMove ) );\n\n\t// Return new position between two newly created text nodes.\n\treturn new Position( position.parent.parent, position.parent.index + 1 );\n}\n\n// Merges two text nodes into first node. Removes second node and returns merge position.\n//\n// @param {module:engine/view/text~Text} t1 First text node to merge. Data from second text node will be moved at the end of\n// this text node.\n// @param {module:engine/view/text~Text} t2 Second text node to merge. This node will be removed after merging.\n// @returns {module:engine/view/position~Position} Position after merging text nodes.\nfunction mergeTextNodes( t1, t2 ) {\n\t// Merge text data into first text node and remove second one.\n\tconst nodeBeforeLength = t1.data.length;\n\tt1._data += t2.data;\n\tt2._remove();\n\n\treturn new Position( t1, nodeBeforeLength );\n}\n\n// Returns `true` if range is located in same {@link module:engine/view/attributeelement~AttributeElement AttributeElement}\n// (`start` and `end` positions are located inside same {@link module:engine/view/attributeelement~AttributeElement AttributeElement}),\n// starts on 0 offset and ends after last child node.\n//\n// @param {module:engine/view/range~Range} Range\n// @returns {Boolean}\nfunction rangeSpansOnAllChildren( range ) {\n\treturn range.start.parent == range.end.parent && range.start.parent.is( 'attributeElement' ) &&\n\t\trange.start.offset === 0 && range.end.offset === range.start.parent.childCount;\n}\n\n// Checks if provided nodes are valid to insert. Checks if each node is an instance of\n// {@link module:engine/view/text~Text Text} or {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n// {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n// {@link module:engine/view/emptyelement~EmptyElement EmptyElement} or\n// {@link module:engine/view/uielement~UIElement UIElement}.\n//\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n// contains instances that are not {@link module:engine/view/text~Text Texts},\n// {@link module:engine/view/emptyelement~EmptyElement EmptyElements},\n// {@link module:engine/view/uielement~UIElement UIElements},\n// {@link module:engine/view/attributeelement~AttributeElement AttributeElements} or\n// {@link module:engine/view/containerelement~ContainerElement ContainerElements}.\n//\n// @param Iterable. nodes\nfunction validateNodesToInsert( nodes ) {\n\tfor ( const node of nodes ) {\n\t\tif ( !validNodesToInsert.some( ( validNode => node instanceof validNode ) ) ) { // eslint-disable-line no-use-before-define\n\t\t\t/**\n\t\t\t * Inserted nodes should be valid to insert. of {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n\t\t\t * {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n\t\t\t * {@link module:engine/view/emptyelement~EmptyElement EmptyElement},\n\t\t\t * {@link module:engine/view/uielement~UIElement UIElement}, {@link module:engine/view/text~Text Text}.\n\t\t\t *\n\t\t\t * @error view-writer-insert-invalid-node\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-insert-invalid-node' );\n\t\t}\n\n\t\tif ( !node.is( 'text' ) ) {\n\t\t\tvalidateNodesToInsert( node.getChildren() );\n\t\t}\n\t}\n}\n\nconst validNodesToInsert = [ Text, AttributeElement, ContainerElement, EmptyElement, UIElement ];\n\n// Checks if node is ContainerElement or DocumentFragment, because in most cases they should be treated the same way.\n//\n// @param {module:engine/view/node~Node} node\n// @returns {Boolean} Returns `true` if node is instance of ContainerElement or DocumentFragment.\nfunction isContainerOrFragment( node ) {\n\treturn node && ( node.is( 'containerElement' ) || node.is( 'documentFragment' ) );\n}\n\n// Checks if {@link module:engine/view/range~Range#start range start} and {@link module:engine/view/range~Range#end range end} are placed\n// inside same {@link module:engine/view/containerelement~ContainerElement container element}.\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when validation fails.\n//\n// @param {module:engine/view/range~Range} range\nfunction validateRangeContainer( range ) {\n\tconst startContainer = getParentContainer( range.start );\n\tconst endContainer = getParentContainer( range.end );\n\n\tif ( !startContainer || !endContainer || startContainer !== endContainer ) {\n\t\t/**\n\t\t * Range container is invalid. This can happen if {@link module:engine/view/range~Range#start range start} and\n\t\t * {@link module:engine/view/range~Range#end range end} positions are not placed inside same container or\n\t\t * parent container for these positions cannot be found.\n\t\t *\n\t\t * @error view-writer-invalid-range-container\n\t\t */\n\t\tthrow new CKEditorError( 'view-writer-invalid-range-container' );\n\t}\n}\n\n// Checks if two attribute elements can be joined together. Elements can be joined together if, and only if\n// they do not have ids specified.\n//\n// @private\n// @param {module:engine/view/element~Element} a\n// @param {module:engine/view/element~Element} b\n// @returns {Boolean}\nfunction canBeJoined( a, b ) {\n\treturn a.id === null && b.id === null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/istext\n */\n\n/**\n * Checks if the object is a native DOM Text node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isText( obj ) {\n\treturn Object.prototype.toString.call( obj ) == '[object Text]';\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\n\n/**\n * Set of utils related to block and inline fillers handling.\n *\n * Browsers do not allow to put caret in elements which does not have height. Because of it, we need to fill all\n * empty elements which should be selectable with elements or characters called \"fillers\". Unfortunately there is no one\n * universal filler, this is why two types are uses:\n *\n * * Block filler is an element which fill block elements, like `

`. CKEditor uses `
` as a block filler during the editing,\n * as browsers do natively. So instead of an empty `

` there will be `


`. The advantage of block filler is that\n * it is transparent for the selection, so when the caret is before the `
` and user presses right arrow he will be\n * moved to the next paragraph, not after the `
`. The disadvantage is that it breaks a block, so it can not be used\n * in the middle of a line of text. The {@link module:engine/view/filler~BR_FILLER `
` filler} can be replaced with any other\n * character in the data output, for instance {@link module:engine/view/filler~NBSP_FILLER non-breaking space}.\n *\n * * Inline filler is a filler which does not break a line of text, so it can be used inside the text, for instance in the empty\n * `` surrendered by text: `foobar`, if we want to put the caret there. CKEditor uses a sequence of the zero-width\n * spaces as an {@link module:engine/view/filler~INLINE_FILLER inline filler} having the predetermined\n * {@link module:engine/view/filler~INLINE_FILLER_LENGTH length}. A sequence is used, instead of a single character to\n * avoid treating random zero-width spaces as the inline filler. Disadvantage of the inline filler is that it is not\n * transparent for the selection. The arrow key moves the caret between zero-width spaces characters, so the additional\n * code is needed to handle the caret.\n *\n * Both inline and block fillers are handled by the {@link module:engine/view/renderer~Renderer renderer} and are not present in the\n * view.\n *\n * @module engine/view/filler\n */\n\n/**\n * `
` filler creator. This is a function which creates `
` element.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~NBSP_FILLER\n * @function\n */\nexport const BR_FILLER = domDocument => {\n\tconst fillerBr = domDocument.createElement( 'br' );\n\tfillerBr.dataset.ckeFiller = true;\n\n\treturn fillerBr;\n};\n\n/**\n * Non-breaking space filler creator. This is a function which creates ` ` text node.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~BR_FILLER\n * @function\n */\nexport const NBSP_FILLER = domDocument => domDocument.createTextNode( '\\u00A0' );\n\n/**\n * Length of the {@link module:engine/view/filler~INLINE_FILLER INLINE_FILLER}.\n */\nexport const INLINE_FILLER_LENGTH = 7;\n\n/**\n * Inline filler which is sequence of the zero width spaces.\n */\nexport let INLINE_FILLER = '';\n\nfor ( let i = 0; i < INLINE_FILLER_LENGTH; i++ ) {\n\tINLINE_FILLER += '\\u200b';\n}\n\n/**\n * Checks if the node is a text node which starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( 'foo' ) ); // false\n *\t\tstartsWithFiller( document.createElement( 'p' ) ); // false\n *\n * @param {Node} domNode DOM node.\n * @returns {Boolean} True if the text node starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function startsWithFiller( domNode ) {\n\treturn isText( domNode ) && ( domNode.data.substr( 0, INLINE_FILLER_LENGTH ) === INLINE_FILLER );\n}\n\n/**\n * Checks if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // false\n *\n * @param {Text} domText DOM text node.\n * @returns {Boolean} True if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isInlineFiller( domText ) {\n\treturn domText.data.length == INLINE_FILLER_LENGTH && startsWithFiller( domText );\n}\n\n/**\n * Get string data from the text node, removing an {@link module:engine/view/filler~INLINE_FILLER inline filler} from it,\n * if text node contains it.\n *\n *\t\tgetDataWithoutFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ) == 'foo' // true\n *\t\tgetDataWithoutFiller( document.createTextNode( 'foo' ) ) == 'foo' // true\n *\n * @param {Text} domText DOM text node, possible with inline filler.\n * @returns {String} Data without filler.\n */\nexport function getDataWithoutFiller( domText ) {\n\tif ( startsWithFiller( domText ) ) {\n\t\treturn domText.data.slice( INLINE_FILLER_LENGTH );\n\t} else {\n\t\treturn domText.data;\n\t}\n}\n\n// Cache block fillers templates to improve performance.\nconst templateBlockFillers = new WeakMap();\n\n/**\n * Checks if the node is an instance of the block filler of the given type.\n *\n *\t\tconst brFillerInstance = BR_FILLER( document );\n *\t\tisBlockFiller( brFillerInstance, BR_FILLER ); // true\n *\n * @param {Node} domNode DOM node to check.\n * @param {Function} blockFiller Block filler creator.\n * @returns {Boolean} True if text node contains only {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isBlockFiller( domNode, blockFiller ) {\n\tlet templateBlockFiller = templateBlockFillers.get( blockFiller );\n\n\tif ( !templateBlockFiller ) {\n\t\ttemplateBlockFiller = blockFiller( window.document );\n\t\ttemplateBlockFillers.set( blockFiller, templateBlockFiller );\n\t}\n\n\treturn domNode.isEqualNode( templateBlockFiller );\n}\n\n/**\n * Assign key observer which move cursor from the end of the inline filler to the beginning of it when\n * the left arrow is pressed, so the filler does not break navigation.\n *\n * @param {module:engine/view/view~View} view View controller instance we should inject quirks handling on.\n */\nexport function injectQuirksHandling( view ) {\n\tview.document.on( 'keydown', jumpOverInlineFiller );\n}\n\n// Move cursor from the end of the inline filler to the beginning of it when, so the filler does not break navigation.\nfunction jumpOverInlineFiller( evt, data ) {\n\tif ( data.keyCode == keyCodes.arrowleft ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\tif ( domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed ) {\n\t\t\tconst domParent = domSelection.getRangeAt( 0 ).startContainer;\n\t\t\tconst domOffset = domSelection.getRangeAt( 0 ).startOffset;\n\n\t\t\tif ( startsWithFiller( domParent ) && domOffset <= INLINE_FILLER_LENGTH ) {\n\t\t\t\tdomSelection.collapse( domParent, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/diff\n */\n\n// The following code is based on the \"O(NP) Sequence Comparison Algorithm\"\n// by Sun Wu, Udi Manber, Gene Myers, Webb Miller.\n\n/**\n * Calculates the difference between two arrays or strings producing an array containing a list of changes\n * necessary to transform input into output.\n *\n *\t\tdiff( 'aba', 'acca' ); // [ 'equal', 'insert', 'insert', 'delete', 'equal' ]\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Output array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default === is used.\n * @returns {Array} Array of changes.\n */\nexport default function diff( a, b, cmp ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\t// Temporary action type statics.\n\tlet _insert, _delete;\n\n\t// Swapped the arrays to use the shorter one as the first one.\n\tif ( b.length < a.length ) {\n\t\tconst tmp = a;\n\n\t\ta = b;\n\t\tb = tmp;\n\n\t\t// We swap the action types as well.\n\t\t_insert = 'delete';\n\t\t_delete = 'insert';\n\t} else {\n\t\t_insert = 'insert';\n\t\t_delete = 'delete';\n\t}\n\n\tconst m = a.length;\n\tconst n = b.length;\n\tconst delta = n - m;\n\n\t// Edit scripts, for each diagonal.\n\tconst es = {};\n\t// Furthest points, the furthest y we can get on each diagonal.\n\tconst fp = {};\n\n\tfunction snake( k ) {\n\t\t// We use -1 as an alternative below to handle initial values ( instead of filling the fp with -1 first ).\n\t\t// Furthest points (y) on the diagonal below k.\n\t\tconst y1 = ( fp[ k - 1 ] !== undefined ? fp[ k - 1 ] : -1 ) + 1;\n\t\t// Furthest points (y) on the diagonal above k.\n\t\tconst y2 = fp[ k + 1 ] !== undefined ? fp[ k + 1 ] : -1;\n\t\t// The way we should go to get further.\n\t\tconst dir = y1 > y2 ? -1 : 1;\n\n\t\t// Clone previous changes array (if any).\n\t\tif ( es[ k + dir ] ) {\n\t\t\tes[ k ] = es[ k + dir ].slice( 0 );\n\t\t}\n\n\t\t// Create changes array.\n\t\tif ( !es[ k ] ) {\n\t\t\tes[ k ] = [];\n\t\t}\n\n\t\t// Push the action.\n\t\tes[ k ].push( y1 > y2 ? _insert : _delete );\n\n\t\t// Set the beginning coordinates.\n\t\tlet y = Math.max( y1, y2 );\n\t\tlet x = y - k;\n\n\t\t// Traverse the diagonal as long as the values match.\n\t\twhile ( x < m && y < n && cmp( a[ x ], b[ y ] ) ) {\n\t\t\tx++;\n\t\t\ty++;\n\t\t\t// Push no change action.\n\t\t\tes[ k ].push( 'equal' );\n\t\t}\n\n\t\treturn y;\n\t}\n\n\tlet p = 0;\n\tlet k;\n\n\t// Traverse the graph until we reach the end of the longer string.\n\tdo {\n\t\t// Updates furthest points and edit scripts for diagonals below delta.\n\t\tfor ( k = -p; k < delta; k++ ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest points and edit scripts for diagonals above delta.\n\t\tfor ( k = delta + p; k > delta; k-- ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest point and edit script for the delta diagonal.\n\t\t// note that the delta diagonal is the one which goes through the sink (m, n).\n\t\tfp[ delta ] = snake( delta );\n\n\t\tp++;\n\t} while ( fp[ delta ] !== n );\n\n\t// Return the final list of edit changes.\n\t// We remove the first item that represents the action for the injected nulls.\n\treturn es[ delta ].slice( 1 );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/insertat\n */\n\n/**\n * Inserts node to the parent at given index.\n *\n * @param {Element} parentElement Parent element.\n * @param {Number} index Insertions index.\n * @param {Node} nodeToInsert Node to insert.\n */\nexport default function insertAt( parentElement, index, nodeToInsert ) {\n\tparentElement.insertBefore( nodeToInsert, parentElement.childNodes[ index ] || null );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/remove\n */\n\n/**\n * Removes given node from parent.\n *\n * @param {Node} node Node to remove.\n */\nexport default function remove( node ) {\n\tconst parent = node.parentNode;\n\n\tif ( parent ) {\n\t\tparent.removeChild( node );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/isnode\n */\n\n/**\n * Checks if the object is a native DOM Node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isNode( obj ) {\n\tif ( obj ) {\n\t\tif ( obj.defaultView ) {\n\t\t\treturn obj instanceof obj.defaultView.Document;\n\t\t} else if ( obj.ownerDocument && obj.ownerDocument.defaultView ) {\n\t\t\treturn obj instanceof obj.ownerDocument.defaultView.Node;\n\t\t}\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/fastdiff\n */\n\n/**\n * Finds position of the first and last change in the given strings and generates set of changes. Set of changes\n * can be applied to the input text in order to transform it into the output text, for example:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ { index: 2, type: 'insert', values: [ 'x', 'y', 'z' ] } ]\n *\n *\t\tfastDiff( '12a', '12aa' );\n *\t\t// [ { index: 3, type: 'insert', values: [ 'a' ] } ]\n *\n *\t\tfastDiff( '12xyza', '12a' );\n *\t\t// [ { index: 2, type: 'delete', howMany: 3 } ]\n *\n *\t\tfastDiff( '12aa', '12a' );\n *\t\t// [ { index: 3, type: 'delete', howMany: 1 } ]\n *\n *\t\tfastDiff( '12abc3', '2ab' );\n *\t\t// [ { index: 0, type: 'insert', values: [ '2', 'a', 'b' ] }, { index: 3, type: 'delete', howMany: 6 } ]\n *\n * Using returned results you can modify `oldText` to transform it into `newText`:\n *\n * \t\tlet input = '12abc3';\n * \t\tconst output = '2ab';\n * \t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + change.values.join( '' ) + input.substring( change.index );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + input.substring( change.index + change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\tinput === output; // -> true\n *\n * The output format of this function is compatible with {@link module:utils/difftochanges~diffToChanges} output format.\n *\n * @param {String} oldText Input string.\n * @param {String} newText Input string.\n * @returns {Array} Array of changes.\n */\nexport default function fastDiff( oldText, newText ) {\n\t// Check if both texts are equal.\n\tif ( oldText === newText ) {\n\t\treturn [];\n\t}\n\n\tconst changeIndexes = findChangeBoundaryIndexes( oldText, newText );\n\n\treturn changeIndexesToChanges( newText, changeIndexes );\n}\n\n// Finds position of the first and last change in the given strings. For example:\n//\n//\t\tconst indexes = findChangeBoundaryIndexes( '1234', '13424' );\n//\t\tconsole.log( indexes ); // { firstIndex: 1, lastIndexOld: 3, lastIndexNew: 4 }\n//\n// The above indexes means that in `oldText` modified part is `1[23]4` and in the `newText` it is `1[342]4`.\n// Based on such indexes, array with `insert`/`delete` operations which allows transforming\n// old text to the new one can be generated.\n//\n// It is expected that `oldText` and `newText` are different.\n//\n// @param {String} oldText\n// @param {String} newText\n// @returns {Object}\n// @returns {Number} return.firstIndex Index of the first change in both strings (always the same for both).\n// @returns {Number} result.lastIndexOld Index of the last common character in `oldText` string.\n// @returns {Number} result.lastIndexNew Index of the last common character in `newText` string.\nfunction findChangeBoundaryIndexes( oldText, newText ) {\n\t// Find the first difference between texts.\n\tconst firstIndex = findFirstDifferenceIndex( oldText, newText );\n\n\t// Remove the common part of texts and reverse them to make it simpler to find the last difference between texts.\n\tconst oldTextReversed = cutAndReverse( oldText, firstIndex );\n\tconst newTextReversed = cutAndReverse( newText, firstIndex );\n\n\t// Find the first difference between reversed texts.\n\t// It should be treated as \"how many characters from the end the last difference occurred\".\n\t//\n\t// For example:\n\t//\n\t// \t\t\tinitial\t->\tafter cut\t-> reversed:\n\t// oldText:\t'321ba'\t->\t'21ba'\t\t-> 'ab12'\n\t// newText:\t'31xba'\t->\t'1xba'\t\t-> 'abx1'\n\t// lastIndex:\t\t\t\t\t\t-> 2\n\t//\n\t// So the last change occurred two characters from the end of the texts.\n\tconst lastIndex = findFirstDifferenceIndex( oldTextReversed, newTextReversed );\n\n\t// Use `lastIndex` to calculate proper offset, starting from the beginning (`lastIndex` kind of starts from the end).\n\tconst lastIndexOld = oldText.length - lastIndex;\n\tconst lastIndexNew = newText.length - lastIndex;\n\n\treturn { firstIndex, lastIndexOld, lastIndexNew };\n}\n\n// Returns a first index on which `oldText` and `newText` differ.\n//\n// @param {String} oldText\n// @param {String} newText\n// @returns {Number}\nfunction findFirstDifferenceIndex( oldText, newText ) {\n\tfor ( let i = 0; i < Math.max( oldText.length, newText.length ); i++ ) {\n\t\tif ( oldText[ i ] !== newText[ i ] ) {\n\t\t\treturn i;\n\t\t}\n\t}\n\t// No \"backup\" return cause we assume that `oldText` and `newText` differ. This means that they either have a\n\t// difference or they have a different lengths. This means that the `if` condition will always be met eventually.\n}\n\n// Removes `howMany` characters from the given `text` string starting from the beginning, then reverses and returns it.\n//\n// @param {String} text Text to be processed.\n// @param {Number} howMany How many characters from text beginning to cut.\n// @returns {String} Shortened and reversed text.\nfunction cutAndReverse( text, howMany ) {\n\treturn text.substring( howMany ).split( '' ).reverse().join( '' );\n}\n\n// Generates changes array based on change indexes from `findChangeBoundaryIndexes` function. This function will\n// generate array with 0 (no changes), 1 (deletion or insertion) or 2 records (insertion and deletion).\n//\n// @param {String} newText New text for which change indexes were calculated.\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @returns {Array.} Array of changes compatible with {@link module:utils/difftochanges~diffToChanges} format.\nfunction changeIndexesToChanges( newText, changeIndexes ) {\n\tconst result = [];\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// Order operations as 'insert', 'delete' array to keep compatibility with {@link module:utils/difftochanges~diffToChanges}\n\t// in most cases. However, 'diffToChanges' does not stick to any order so in some cases\n\t// (for example replacing '12345' with 'abcd') it will generate 'delete', 'insert' order.\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex,\n\t\t\ttype: 'insert',\n\t\t\tvalues: newText.substring( firstIndex, lastIndexNew ).split( '' )\n\t\t} );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex + ( lastIndexNew - firstIndex ), // Increase index of what was inserted.\n\t\t\ttype: 'delete',\n\t\t\thowMany: lastIndexOld - firstIndex\n\t\t} );\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals Node */\n\n/**\n * @module engine/view/renderer\n */\n\nimport ViewText from './text';\nimport ViewPosition from './position';\nimport { INLINE_FILLER, INLINE_FILLER_LENGTH, startsWithFiller, isInlineFiller, isBlockFiller } from './filler';\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport insertAt from '@ckeditor/ckeditor5-utils/src/dom/insertat';\nimport remove from '@ckeditor/ckeditor5-utils/src/dom/remove';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';\nimport fastDiff from '@ckeditor/ckeditor5-utils/src/fastdiff';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Renderer is responsible for updating the DOM structure and the DOM selection based on\n * the {@link module:engine/view/renderer~Renderer#markToSync information about updated view nodes}.\n * In other words, it renders the view to the DOM.\n *\n * Its main responsibility is to make only the necessary, minimal changes to the DOM. However, unlike in many\n * virtual DOM implementations, the primary reason for doing minimal changes is not the performance but ensuring\n * that native editing features such as text composition, autocompletion, spell checking, selection's x-index are\n * affected as little as possible.\n *\n * Renderer uses {@link module:engine/view/domconverter~DomConverter} to transform view nodes and positions\n * to and from the DOM.\n */\nexport default class Renderer {\n\t/**\n\t * Creates a renderer instance.\n\t *\n\t * @param {module:engine/view/domconverter~DomConverter} domConverter Converter instance.\n\t * @param {module:engine/view/documentselection~DocumentSelection} selection View selection.\n\t */\n\tconstructor( domConverter, selection ) {\n\t\t/**\n\t\t * Set of DOM Documents instances.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.domDocuments = new Set();\n\n\t\t/**\n\t\t * Converter instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = domConverter;\n\n\t\t/**\n\t\t * Set of nodes which attributes changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.markedAttributes = new Set();\n\n\t\t/**\n\t\t * Set of elements which child lists changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.markedChildren = new Set();\n\n\t\t/**\n\t\t * Set of text nodes which text data changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.markedTexts = new Set();\n\n\t\t/**\n\t\t * View selection. Renderer updates DOM selection based on the view selection.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t */\n\t\tthis.selection = selection;\n\n\t\t/**\n\t\t * Indicates if the view document is focused and selection can be rendered. Selection will not be rendered if\n\t\t * this is set to `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isFocused = false;\n\n\t\t/**\n\t\t * The text node in which the inline filler was rendered.\n\t\t *\n\t\t * @private\n\t\t * @member {Text}\n\t\t */\n\t\tthis._inlineFiller = null;\n\n\t\t/**\n\t\t * DOM element containing fake selection.\n\t\t *\n\t\t * @private\n\t\t * @type {null|HTMLElement}\n\t\t */\n\t\tthis._fakeSelectionContainer = null;\n\t}\n\n\t/**\n\t * Marks a view node to be updated in the DOM by {@link #render `render()`}.\n\t *\n\t * Note that only view nodes whose parents have corresponding DOM elements need to be marked to be synchronized.\n\t *\n\t * @see #markedAttributes\n\t * @see #markedChildren\n\t * @see #markedTexts\n\t *\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Node to be marked.\n\t */\n\tmarkToSync( type, node ) {\n\t\tif ( type === 'text' ) {\n\t\t\tif ( this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis.markedTexts.add( node );\n\t\t\t}\n\t\t} else {\n\t\t\t// If the node has no DOM element it is not rendered yet,\n\t\t\t// its children/attributes do not need to be marked to be sync.\n\t\t\tif ( !this.domConverter.mapViewToDom( node ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( type === 'attributes' ) {\n\t\t\t\tthis.markedAttributes.add( node );\n\t\t\t} else if ( type === 'children' ) {\n\t\t\t\tthis.markedChildren.add( node );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * Unknown type passed to Renderer.markToSync.\n\t\t\t\t *\n\t\t\t\t * @error renderer-unknown-type\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'view-renderer-unknown-type: Unknown type passed to Renderer.markToSync.' );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Renders all buffered changes ({@link #markedAttributes}, {@link #markedChildren} and {@link #markedTexts}) and\n\t * the current view selection (if needed) to the DOM by applying a minimal set of changes to it.\n\t *\n\t * Renderer tries not to break the text composition (e.g. IME) and x-index of the selection,\n\t * so it does as little as it is needed to update the DOM.\n\t *\n\t * Renderer also handles {@link module:engine/view/filler fillers}. Especially, it checks if the inline filler is needed\n\t * at the selection position and adds or removes it. To prevent breaking text composition inline filler will not be\n\t * removed as long as the selection is in the text node which needed it at first.\n\t */\n\trender() {\n\t\tlet inlineFillerPosition;\n\n\t\t// Refresh mappings.\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildrenMappings( element );\n\t\t}\n\n\t\t// There was inline filler rendered in the DOM but it's not\n\t\t// at the selection position any more, so we can remove it\n\t\t// (cause even if it's needed, it must be placed in another location).\n\t\tif ( this._inlineFiller && !this._isSelectionInInlineFiller() ) {\n\t\t\tthis._removeInlineFiller();\n\t\t}\n\n\t\t// If we've got the filler, let's try to guess its position in the view.\n\t\tif ( this._inlineFiller ) {\n\t\t\tinlineFillerPosition = this._getInlineFillerPosition();\n\t\t}\n\t\t// Otherwise, if it's needed, create it at the selection position.\n\t\telse if ( this._needsInlineFillerAtSelection() ) {\n\t\t\tinlineFillerPosition = this.selection.getFirstPosition();\n\n\t\t\t// Do not use `markToSync` so it will be added even if the parent is already added.\n\t\t\tthis.markedChildren.add( inlineFillerPosition.parent );\n\t\t}\n\n\t\tfor ( const element of this.markedAttributes ) {\n\t\t\tthis._updateAttrs( element );\n\t\t}\n\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildren( element, { inlineFillerPosition } );\n\t\t}\n\n\t\tfor ( const node of this.markedTexts ) {\n\t\t\tif ( !this.markedChildren.has( node.parent ) && this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis._updateText( node, { inlineFillerPosition } );\n\t\t\t}\n\t\t}\n\n\t\t// Check whether the inline filler is required and where it really is in the DOM.\n\t\t// At this point in most cases it will be in the DOM, but there are exceptions.\n\t\t// For example, if the inline filler was deep in the created DOM structure, it will not be created.\n\t\t// Similarly, if it was removed at the beginning of this function and then neither text nor children were updated,\n\t\t// it will not be present.\n\t\t// Fix those and similar scenarios.\n\t\tif ( inlineFillerPosition ) {\n\t\t\tconst fillerDomPosition = this.domConverter.viewPositionToDom( inlineFillerPosition );\n\t\t\tconst domDocument = fillerDomPosition.parent.ownerDocument;\n\n\t\t\tif ( !startsWithFiller( fillerDomPosition.parent ) ) {\n\t\t\t\t// Filler has not been created at filler position. Create it now.\n\t\t\t\tthis._inlineFiller = addInlineFiller( domDocument, fillerDomPosition.parent, fillerDomPosition.offset );\n\t\t\t} else {\n\t\t\t\t// Filler has been found, save it.\n\t\t\t\tthis._inlineFiller = fillerDomPosition.parent;\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no filler needed.\n\t\t\tthis._inlineFiller = null;\n\t\t}\n\n\t\tthis._updateSelection();\n\t\tthis._updateFocus();\n\n\t\tthis.markedTexts.clear();\n\t\tthis.markedAttributes.clear();\n\t\tthis.markedChildren.clear();\n\t}\n\n\t/**\n\t * Updates mappings of view element's children.\n\t *\n\t * Children that were replaced in the view structure by similar elements (same tag name) are treated as 'replaced'.\n\t * This means that their mappings can be updated so the new view elements are mapped to the existing DOM elements.\n\t * Thanks to that these elements do not need to be re-rendered completely.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose children mappings will be updated.\n\t */\n\t_updateChildrenMappings( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.\n\t\t\treturn;\n\t\t}\n\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { withChildren: false } )\n\t\t);\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\t\tconst actions = this._findReplaceActions( diff, actualDomChildren, expectedDomChildren );\n\n\t\tif ( actions.indexOf( 'replace' ) !== -1 ) {\n\t\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action === 'replace' ) {\n\t\t\t\t\tconst insertIndex = counter.equal + counter.insert;\n\t\t\t\t\tconst deleteIndex = counter.equal + counter.delete;\n\t\t\t\t\tconst viewChild = viewElement.getChild( insertIndex );\n\n\t\t\t\t\t// The 'uiElement' is a special one and its children are not stored in a view (#799),\n\t\t\t\t\t// so we cannot use it with replacing flow (since it uses view children during rendering\n\t\t\t\t\t// which will always result in rendering empty element).\n\t\t\t\t\tif ( viewChild && !viewChild.is( 'uiElement' ) ) {\n\t\t\t\t\t\tthis._updateElementMappings( viewChild, actualDomChildren[ deleteIndex ] );\n\t\t\t\t\t}\n\n\t\t\t\t\tremove( expectedDomChildren[ insertIndex ] );\n\t\t\t\t\tcounter.equal++;\n\t\t\t\t} else {\n\t\t\t\t\tcounter[ action ]++;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Updates mappings of a given view element.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose mappings will be updated.\n\t * @param {Node} domElement The DOM element representing the given view element.\n\t */\n\t_updateElementMappings( viewElement, domElement ) {\n\t\t// Remap 'DomConverter' bindings.\n\t\tthis.domConverter.unbindDomElement( domElement );\n\t\tthis.domConverter.bindElements( domElement, viewElement );\n\n\t\t// View element may have children which needs to be updated, but are not marked, mark them to update.\n\t\tthis.markedChildren.add( viewElement );\n\n\t\t// Because we replace new view element mapping with the existing one, the corresponding DOM element\n\t\t// will not be rerendered. The new view element may have different attributes than the previous one.\n\t\t// Since its corresponding DOM element will not be rerendered, new attributes will not be added\n\t\t// to the DOM, so we need to mark it here to make sure its attributes gets updated. See #1427 for more\n\t\t// detailed case study.\n\t\t// Also there are cases where replaced element is removed from the view structure and then has\n\t\t// its attributes changed or removed. In such cases the element will not be present in `markedAttributes`\n\t\t// and also may be the same (`element.isSimilar()`) as the reused element not having its attributes updated.\n\t\t// To prevent such situations we always mark reused element to have its attributes rerenderd (#1560).\n\t\tthis.markedAttributes.add( viewElement );\n\t}\n\n\t/**\n\t * Gets the position of the inline filler based on the current selection.\n\t * Here, we assume that we know that the filler is needed and\n\t * {@link #_isSelectionInInlineFiller is at the selection position}, and, since it is needed,\n\t * it is somewhere at the selection position.\n\t *\n\t * Note: The filler position cannot be restored based on the filler's DOM text node, because\n\t * when this method is called (before rendering), the bindings will often be broken. View-to-DOM\n\t * bindings are only dependable after rendering.\n\t *\n\t * @private\n\t * @returns {module:engine/view/position~Position}\n\t */\n\t_getInlineFillerPosition() {\n\t\tconst firstPos = this.selection.getFirstPosition();\n\n\t\tif ( firstPos.parent.is( 'text' ) ) {\n\t\t\treturn ViewPosition._createBefore( this.selection.getFirstPosition().parent );\n\t\t} else {\n\t\t\treturn firstPos;\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` if the selection has not left the inline filler's text node.\n\t * If it is `true`, it means that the filler had been added for a reason and the selection did not\n\t * leave the filler's text node. For example, the user can be in the middle of a composition so it should not be touched.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler and selection are in the same place.\n\t */\n\t_isSelectionInInlineFiller() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Note, we can't check if selection's position equals position of the\n\t\t// this._inlineFiller node, because of #663. We may not be able to calculate\n\t\t// the filler's position in the view at this stage.\n\t\t// Instead, we check it the other way – whether selection is anchored in\n\t\t// that text node or next to it.\n\n\t\t// Possible options are:\n\t\t// \"FILLER{}\"\n\t\t// \"FILLERadded-text{}\"\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst position = this.domConverter.viewPositionToDom( selectionPosition );\n\n\t\tif ( position && isText( position.parent ) && startsWithFiller( position.parent ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Removes the inline filler.\n\t *\n\t * @private\n\t */\n\t_removeInlineFiller() {\n\t\tconst domFillerNode = this._inlineFiller;\n\n\t\t// Something weird happened and the stored node doesn't contain the filler's text.\n\t\tif ( !startsWithFiller( domFillerNode ) ) {\n\t\t\t/**\n\t\t\t * The inline filler node was lost. Most likely, something overwrote the filler text node\n\t\t\t * in the DOM.\n\t\t\t *\n\t\t\t * @error view-renderer-filler-was-lost\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-renderer-filler-was-lost: The inline filler node was lost.' );\n\t\t}\n\n\t\tif ( isInlineFiller( domFillerNode ) ) {\n\t\t\tdomFillerNode.parentNode.removeChild( domFillerNode );\n\t\t} else {\n\t\t\tdomFillerNode.data = domFillerNode.data.substr( INLINE_FILLER_LENGTH );\n\t\t}\n\n\t\tthis._inlineFiller = null;\n\t}\n\n\t/**\n\t * Checks if the inline {@link module:engine/view/filler filler} should be added.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler should be added.\n\t */\n\t_needsInlineFillerAtSelection() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst selectionParent = selectionPosition.parent;\n\t\tconst selectionOffset = selectionPosition.offset;\n\n\t\t// If there is no DOM root we do not care about fillers.\n\t\tif ( !this.domConverter.mapViewToDom( selectionParent.root ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( !( selectionParent.is( 'element' ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Prevent adding inline filler inside elements with contenteditable=false.\n\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/1170\n\t\tif ( !isEditable( selectionParent ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// We have block filler, we do not need inline one.\n\t\tif ( selectionOffset === selectionParent.getFillerOffset() ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst nodeBefore = selectionPosition.nodeBefore;\n\t\tconst nodeAfter = selectionPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof ViewText || nodeAfter instanceof ViewText ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks if text needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} viewText View text to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateText( viewText, options ) {\n\t\tconst domText = this.domConverter.findCorrespondingDomText( viewText );\n\t\tconst newDomText = this.domConverter.viewToDom( viewText, domText.ownerDocument );\n\n\t\tconst actualText = domText.data;\n\t\tlet expectedText = newDomText.data;\n\n\t\tconst filler = options.inlineFillerPosition;\n\n\t\tif ( filler && filler.parent == viewText.parent && filler.offset == viewText.index ) {\n\t\t\texpectedText = INLINE_FILLER + expectedText;\n\t\t}\n\n\t\tif ( actualText != expectedText ) {\n\t\t\tconst actions = fastDiff( actualText, expectedText );\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action.type === 'insert' ) {\n\t\t\t\t\tdomText.insertData( action.index, action.values.join( '' ) );\n\t\t\t\t} else { // 'delete'\n\t\t\t\t\tdomText.deleteData( action.index, action.howMany );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if attribute list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement The view element to update.\n\t */\n\t_updateAttrs( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that 'viewElement' is outdated as its mapping was updated\n\t\t\t// in 'this._updateChildrenMappings()'. There is no need to process it as new view element which\n\t\t\t// replaced old 'viewElement' mapping was also added to 'this.markedAttributes'\n\t\t\t// in 'this._updateChildrenMappings()' so it will be processed separately.\n\t\t\treturn;\n\t\t}\n\n\t\tconst domAttrKeys = Array.from( domElement.attributes ).map( attr => attr.name );\n\t\tconst viewAttrKeys = viewElement.getAttributeKeys();\n\n\t\t// Add or overwrite attributes.\n\t\tfor ( const key of viewAttrKeys ) {\n\t\t\tdomElement.setAttribute( key, viewElement.getAttribute( key ) );\n\t\t}\n\n\t\t// Remove from DOM attributes which do not exists in the view.\n\t\tfor ( const key of domAttrKeys ) {\n\t\t\tif ( !viewElement.hasAttribute( key ) ) {\n\t\t\t\tdomElement.removeAttribute( key );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if elements child list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement View element to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateChildren( viewElement, options ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM.\n\t\t\t// There is no need to process it. It will be processed when re-inserted.\n\t\t\treturn;\n\t\t}\n\n\t\tconst inlineFillerPosition = options.inlineFillerPosition;\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { bind: true, inlineFillerPosition } )\n\t\t);\n\n\t\t// Inline filler element has to be created as it is present in the DOM, but not in the view. It is required\n\t\t// during diffing so text nodes could be compared correctly and also during rendering to maintain\n\t\t// proper order and indexes while updating the DOM.\n\t\tif ( inlineFillerPosition && inlineFillerPosition.parent === viewElement ) {\n\t\t\taddInlineFiller( domElement.ownerDocument, expectedDomChildren, inlineFillerPosition.offset );\n\t\t}\n\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\n\t\tlet i = 0;\n\t\tconst nodesToUnbind = new Set();\n\n\t\tfor ( const action of diff ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\tinsertAt( domElement, i, expectedDomChildren[ i ] );\n\t\t\t\ti++;\n\t\t\t} else if ( action === 'delete' ) {\n\t\t\t\tnodesToUnbind.add( actualDomChildren[ i ] );\n\t\t\t\tremove( actualDomChildren[ i ] );\n\t\t\t} else { // 'equal'\n\t\t\t\t// Force updating text nodes inside elements which did not change and do not need to be re-rendered (#1125).\n\t\t\t\tthis._markDescendantTextToSync( this.domConverter.domToView( expectedDomChildren[ i ] ) );\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\t// Unbind removed nodes. When node does not have a parent it means that it was removed from DOM tree during\n\t\t// comparision with the expected DOM. We don't need to check child nodes, because if child node was reinserted,\n\t\t// it was moved to DOM tree out of the removed node.\n\t\tfor ( const node of nodesToUnbind ) {\n\t\t\tif ( !node.parentNode ) {\n\t\t\t\tthis.domConverter.unbindDomElement( node );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Shorthand for diffing two arrays or node lists of DOM nodes.\n\t *\n\t * @private\n\t * @param {Array.|NodeList} actualDomChildren Actual DOM children\n\t * @param {Array.|NodeList} expectedDomChildren Expected DOM children.\n\t * @returns {Array.} The list of actions based on the {@link module:utils/diff~diff} function.\n\t */\n\t_diffNodeLists( actualDomChildren, expectedDomChildren ) {\n\t\treturn diff( actualDomChildren, expectedDomChildren, sameNodes.bind( null, this.domConverter.blockFiller ) );\n\t}\n\n\t/**\n\t * Finds DOM nodes that were replaced with the similar nodes (same tag name) in the view. All nodes are compared\n\t * within one `insert`/`delete` action group, for example:\n\t *\n\t * \t\tActual DOM:\t\t

FooBarBazBax

\n\t * \t\tExpected DOM:\t

Bar123Baz456

\n\t * \t\tInput actions:\t[ insert, insert, delete, delete, equal, insert, delete ]\n\t * \t\tOutput actions:\t[ insert, replace, delete, equal, replace ]\n\t *\n\t * @private\n\t * @param {Array.} actions Actions array which is a result of the {@link module:utils/diff~diff} function.\n\t * @param {Array.|NodeList} actualDom Actual DOM children\n\t * @param {Array.} expectedDom Expected DOM children.\n\t * @returns {Array.} Actions array modified with the `replace` actions.\n\t */\n\t_findReplaceActions( actions, actualDom, expectedDom ) {\n\t\t// If there is no both 'insert' and 'delete' actions, no need to check for replaced elements.\n\t\tif ( actions.indexOf( 'insert' ) === -1 || actions.indexOf( 'delete' ) === -1 ) {\n\t\t\treturn actions;\n\t\t}\n\n\t\tlet newActions = [];\n\t\tlet actualSlice = [];\n\t\tlet expectedSlice = [];\n\n\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\tfor ( const action of actions ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\texpectedSlice.push( expectedDom[ counter.equal + counter.insert ] );\n\t\t\t} else if ( action === 'delete' ) {\n\t\t\t\tactualSlice.push( actualDom[ counter.equal + counter.delete ] );\n\t\t\t} else { // equal\n\t\t\t\tnewActions = newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t\t\t\tnewActions.push( 'equal' );\n\t\t\t\t// Reset stored elements on 'equal'.\n\t\t\t\tactualSlice = [];\n\t\t\t\texpectedSlice = [];\n\t\t\t}\n\t\t\tcounter[ action ]++;\n\t\t}\n\n\t\treturn newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t}\n\n\t/**\n\t * Marks text nodes to be synchronized.\n\t *\n\t * If a text node is passed, it will be marked. If an element is passed, all descendant text nodes inside it will be marked.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewNode View node to sync.\n\t */\n\t_markDescendantTextToSync( viewNode ) {\n\t\tif ( !viewNode ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( viewNode.is( 'text' ) ) {\n\t\t\tthis.markedTexts.add( viewNode );\n\t\t} else if ( viewNode.is( 'element' ) ) {\n\t\t\tfor ( const child of viewNode.getChildren() ) {\n\t\t\t\tthis._markDescendantTextToSync( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if the selection needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateSelection() {\n\t\t// If there is no selection - remove DOM and fake selections.\n\t\tif ( this.selection.rangeCount === 0 ) {\n\t\t\tthis._removeDomSelection();\n\t\t\tthis._removeFakeSelection();\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst domRoot = this.domConverter.mapViewToDom( this.selection.editableElement );\n\n\t\t// Do nothing if there is no focus, or there is no DOM element corresponding to selection's editable element.\n\t\tif ( !this.isFocused || !domRoot ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Render selection.\n\t\tif ( this.selection.isFake ) {\n\t\t\tthis._updateFakeSelection( domRoot );\n\t\t} else {\n\t\t\tthis._removeFakeSelection();\n\t\t\tthis._updateDomSelection( domRoot );\n\t\t}\n\t}\n\n\t/**\n\t * Updates the fake selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the fake selection container should be added.\n\t */\n\t_updateFakeSelection( domRoot ) {\n\t\tconst domDocument = domRoot.ownerDocument;\n\t\tlet container = this._fakeSelectionContainer;\n\n\t\t// Create fake selection container if one does not exist.\n\t\tif ( !container ) {\n\t\t\tthis._fakeSelectionContainer = container = domDocument.createElement( 'div' );\n\n\t\t\tObject.assign( container.style, {\n\t\t\t\tposition: 'fixed',\n\t\t\t\ttop: 0,\n\t\t\t\tleft: '-9999px',\n\t\t\t\t// See https://github.com/ckeditor/ckeditor5/issues/752.\n\t\t\t\twidth: '42px'\n\t\t\t} );\n\n\t\t\t// Fill it with a text node so we can update it later.\n\t\t\tcontainer.appendChild( domDocument.createTextNode( '\\u00A0' ) );\n\t\t}\n\n\t\t// Add fake container if not already added.\n\t\tif ( !container.parentElement ) {\n\t\t\tdomRoot.appendChild( container );\n\t\t}\n\n\t\t// Update contents.\n\t\tcontainer.firstChild.data = this.selection.fakeSelectionLabel || '\\u00A0';\n\n\t\t// Update selection.\n\t\tconst domSelection = domDocument.getSelection();\n\t\tconst domRange = domDocument.createRange();\n\n\t\tdomSelection.removeAllRanges();\n\t\tdomRange.selectNodeContents( container );\n\t\tdomSelection.addRange( domRange );\n\n\t\t// Bind fake selection container with current selection.\n\t\tthis.domConverter.bindFakeSelection( container, this.selection );\n\t}\n\n\t/**\n\t * Updates the DOM selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the DOM selection should be rendered.\n\t */\n\t_updateDomSelection( domRoot ) {\n\t\tconst domSelection = domRoot.ownerDocument.defaultView.getSelection();\n\n\t\t// Let's check whether DOM selection needs updating at all.\n\t\tif ( !this._domSelectionNeedsUpdate( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Multi-range selection is not available in most browsers, and, at least in Chrome, trying to\n\t\t// set such selection, that is not continuous, throws an error. Because of that, we will just use anchor\n\t\t// and focus of view selection.\n\t\t// Since we are not supporting multi-range selection, we also do not need to check if proper editable is\n\t\t// selected. If there is any editable selected, it is okay (editable is taken from selection anchor).\n\t\tconst anchor = this.domConverter.viewPositionToDom( this.selection.anchor );\n\t\tconst focus = this.domConverter.viewPositionToDom( this.selection.focus );\n\n\t\t// Focus the new editing host.\n\t\t// Otherwise, FF may throw an error (https://github.com/ckeditor/ckeditor5/issues/721).\n\t\tdomRoot.focus();\n\n\t\tdomSelection.collapse( anchor.parent, anchor.offset );\n\t\tdomSelection.extend( focus.parent, focus.offset );\n\n\t\t// Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).\n\t\tif ( env.isGecko ) {\n\t\t\tfixGeckoSelectionAfterBr( focus, domSelection );\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether a given DOM selection needs to be updated.\n\t *\n\t * @private\n\t * @param {Selection} domSelection The DOM selection to check.\n\t * @returns {Boolean}\n\t */\n\t_domSelectionNeedsUpdate( domSelection ) {\n\t\tif ( !this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\t// Current DOM selection is in incorrect position. We need to update it.\n\t\t\treturn true;\n\t\t}\n\n\t\tconst oldViewSelection = domSelection && this.domConverter.domSelectionToView( domSelection );\n\n\t\tif ( oldViewSelection && this.selection.isEqual( oldViewSelection ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If selection is not collapsed, it does not need to be updated if it is similar.\n\t\tif ( !this.selection.isCollapsed && this.selection.isSimilar( oldViewSelection ) ) {\n\t\t\t// Selection did not changed and is correct, do not update.\n\t\t\treturn false;\n\t\t}\n\n\t\t// Selections are not similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Removes the DOM selection.\n\t *\n\t * @private\n\t */\n\t_removeDomSelection() {\n\t\tfor ( const doc of this.domDocuments ) {\n\t\t\tconst domSelection = doc.getSelection();\n\n\t\t\tif ( domSelection.rangeCount ) {\n\t\t\t\tconst activeDomElement = doc.activeElement;\n\t\t\t\tconst viewElement = this.domConverter.mapDomToView( activeDomElement );\n\n\t\t\t\tif ( activeDomElement && viewElement ) {\n\t\t\t\t\tdoc.getSelection().removeAllRanges();\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Removes the fake selection.\n\t *\n\t * @private\n\t */\n\t_removeFakeSelection() {\n\t\tconst container = this._fakeSelectionContainer;\n\n\t\tif ( container ) {\n\t\t\tcontainer.remove();\n\t\t}\n\t}\n\n\t/**\n\t * Checks if focus needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateFocus() {\n\t\tif ( this.isFocused ) {\n\t\t\tconst editable = this.selection.editableElement;\n\n\t\t\tif ( editable ) {\n\t\t\t\tthis.domConverter.focus( editable );\n\t\t\t}\n\t\t}\n\t}\n}\n\nmix( Renderer, ObservableMixin );\n\n// Checks if provided element is editable.\n//\n// @private\n// @param {module:engine/view/element~Element} element\n// @returns {Boolean}\nfunction isEditable( element ) {\n\tif ( element.getAttribute( 'contenteditable' ) == 'false' ) {\n\t\treturn false;\n\t}\n\n\tconst parent = element.findAncestor( element => element.hasAttribute( 'contenteditable' ) );\n\n\treturn !parent || parent.getAttribute( 'contenteditable' ) == 'true';\n}\n\n// Adds inline filler at a given position.\n//\n// The position can be given as an array of DOM nodes and an offset in that array,\n// or a DOM parent element and an offset in that element.\n//\n// @private\n// @param {Document} domDocument\n// @param {Element|Array.} domParentOrArray\n// @param {Number} offset\n// @returns {Text} The DOM text node that contains an inline filler.\nfunction addInlineFiller( domDocument, domParentOrArray, offset ) {\n\tconst childNodes = domParentOrArray instanceof Array ? domParentOrArray : domParentOrArray.childNodes;\n\tconst nodeAfterFiller = childNodes[ offset ];\n\n\tif ( isText( nodeAfterFiller ) ) {\n\t\tnodeAfterFiller.data = INLINE_FILLER + nodeAfterFiller.data;\n\n\t\treturn nodeAfterFiller;\n\t} else {\n\t\tconst fillerNode = domDocument.createTextNode( INLINE_FILLER );\n\n\t\tif ( Array.isArray( domParentOrArray ) ) {\n\t\t\tchildNodes.splice( offset, 0, fillerNode );\n\t\t} else {\n\t\t\tinsertAt( domParentOrArray, offset, fillerNode );\n\t\t}\n\n\t\treturn fillerNode;\n\t}\n}\n\n// Whether two DOM nodes should be considered as similar.\n// Nodes are considered similar if they have the same tag name.\n//\n// @private\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction areSimilar( node1, node2 ) {\n\treturn isNode( node1 ) && isNode( node2 ) &&\n\t\t!isText( node1 ) && !isText( node2 ) &&\n\t\tnode1.tagName.toLowerCase() === node2.tagName.toLowerCase();\n}\n\n// Whether two dom nodes should be considered as the same.\n// Two nodes which are considered the same are:\n//\n//\t\t* Text nodes with the same text.\n//\t\t* Element nodes represented by the same object.\n//\t\t* Two block filler elements.\n//\n// @private\n// @param {Function} blockFiller Block filler creator function, see {@link module:engine/view/domconverter~DomConverter#blockFiller}.\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction sameNodes( blockFiller, actualDomChild, expectedDomChild ) {\n\t// Elements.\n\tif ( actualDomChild === expectedDomChild ) {\n\t\treturn true;\n\t}\n\t// Texts.\n\telse if ( isText( actualDomChild ) && isText( expectedDomChild ) ) {\n\t\treturn actualDomChild.data === expectedDomChild.data;\n\t}\n\t// Block fillers.\n\telse if ( isBlockFiller( actualDomChild, blockFiller ) &&\n\t\tisBlockFiller( expectedDomChild, blockFiller ) ) {\n\t\treturn true;\n\t}\n\n\t// Not matching types.\n\treturn false;\n}\n\n// The following is a Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).\n// When the native DOM selection is at the end of the block and preceded by
e.g.\n//\n//\t\t

foo
[]

\n//\n// which happens a lot when using the soft line break, the browser fails to (visually) move the\n// caret to the new line. A quick fix is as simple as force–refreshing the selection with the same range.\nfunction fixGeckoSelectionAfterBr( focus, domSelection ) {\n\tconst parent = focus.parent;\n\n\t// This fix works only when the focus point is at the very end of an element.\n\t// There is no point in running it in cases unrelated to the browser bug.\n\tif ( parent.nodeType != Node.ELEMENT_NODE || focus.offset != parent.childNodes.length - 1 ) {\n\t\treturn;\n\t}\n\n\tconst childAtOffset = parent.childNodes[ focus.offset ];\n\n\t// To stay on the safe side, the fix being as specific as possible, it targets only the\n\t// selection which is at the very end of the element and preceded by
.\n\tif ( childAtOffset && childAtOffset.tagName == 'BR' ) {\n\t\tdomSelection.addRange( domSelection.getRangeAt( 0 ) );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window, document */\n\n/**\n * @module utils/dom/global\n */\n\n/**\n * A helper (module) giving an access to the global DOM objects such as `window` and\n * `document`. Accessing these objects using this helper allows easy and bulletproof\n * testing, i.e. stubbing native properties:\n *\n *\t\timport global from 'ckeditor5/utils/dom/global.js';\n *\n *\t\t// This stub will work for any code using global module.\n *\t\ttestUtils.sinon.stub( global, 'window', {\n *\t\t\tinnerWidth: 10000\n *\t\t} );\n *\n *\t\tconsole.log( global.window.innerWidth );\n */\nexport default { window, document };\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/indexof\n */\n\n/**\n * Returns index of the node in the parent element.\n *\n * @param {Node} node Node which index is tested.\n * @returns {Number} Index of the node in the parent element. Returns 0 if node has no parent.\n */\nexport default function indexOf( node ) {\n\tlet index = 0;\n\n\twhile ( node.previousSibling ) {\n\t\tnode = node.previousSibling;\n\t\tindex++;\n\t}\n\n\treturn index;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals Node */\n\n/**\n * @module utils/dom/getancestors\n */\n\n/**\n * Returns all ancestors of given DOM node, starting from the top-most (root). Includes the given node itself. If the\n * node is a part of `DocumentFragment` that `DocumentFragment` will be returned. In contrary, if the node is\n * appended to a `Document`, that `Document` will not be returned (algorithms operating on DOM tree care for `Document#documentElement`\n * at most, which will be returned).\n *\n * @param {Node} node DOM node.\n * @returns {Array.} Array of given `node` parents.\n */\nexport default function getAncestors( node ) {\n\tconst nodes = [];\n\n\t// We are interested in `Node`s `DocumentFragment`s only.\n\twhile ( node && node.nodeType != Node.DOCUMENT_NODE ) {\n\t\tnodes.unshift( node );\n\t\tnode = node.parentNode;\n\t}\n\n\treturn nodes;\n}\n","import isObjectLike from './isObjectLike.js';\nimport isPlainObject from './isPlainObject.js';\n\n/**\n * Checks if `value` is likely a DOM element.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.\n * @example\n *\n * _.isElement(document.body);\n * // => true\n *\n * _.isElement('');\n * // => false\n */\nfunction isElement(value) {\n return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);\n}\n\nexport default isElement;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/domconverter\n */\n\n/* globals document, Node, NodeFilter, Text */\n\nimport ViewText from './text';\nimport ViewElement from './element';\nimport ViewPosition from './position';\nimport ViewRange from './range';\nimport ViewSelection from './selection';\nimport ViewDocumentFragment from './documentfragment';\nimport ViewTreeWalker from './treewalker';\nimport { BR_FILLER, INLINE_FILLER_LENGTH, isBlockFiller, isInlineFiller, startsWithFiller, getDataWithoutFiller } from './filler';\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport indexOf from '@ckeditor/ckeditor5-utils/src/dom/indexof';\nimport getAncestors from '@ckeditor/ckeditor5-utils/src/dom/getancestors';\nimport getCommonAncestor from '@ckeditor/ckeditor5-utils/src/dom/getcommonancestor';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport { isElement } from 'lodash-es';\n\n/**\n * DomConverter is a set of tools to do transformations between DOM nodes and view nodes. It also handles\n * {@link module:engine/view/domconverter~DomConverter#bindElements binding} these nodes.\n *\n * DomConverter does not check which nodes should be rendered (use {@link module:engine/view/renderer~Renderer}), does not keep a\n * state of a tree nor keeps synchronization between tree view and DOM tree (use {@link module:engine/view/document~Document}).\n *\n * DomConverter keeps DOM elements to View element bindings, so when the converter will be destroyed, the binding will\n * be lost. Two converters will keep separate binding maps, so one tree view can be bound with two DOM trees.\n */\nexport default class DomConverter {\n\t/**\n\t * Creates DOM converter.\n\t *\n\t * @param {Object} options Object with configuration options.\n\t * @param {Function} [options.blockFiller=module:engine/view/filler~BR_FILLER] Block filler creator.\n\t */\n\tconstructor( options = {} ) {\n\t\t// Using WeakMap prevent memory leaks: when the converter will be destroyed all referenced between View and DOM\n\t\t// will be removed. Also because it is a *Weak*Map when both view and DOM elements will be removed referenced\n\t\t// will be also removed, isn't it brilliant?\n\t\t//\n\t\t// Yes, PJ. It is.\n\t\t//\n\t\t// You guys so smart.\n\t\t//\n\t\t// I've been here. Seen stuff. Afraid of code now.\n\n\t\t/**\n\t\t * Block {@link module:engine/view/filler filler} creator, which is used to create all block fillers during the\n\t\t * view to DOM conversion and to recognize block fillers during the DOM to view conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Function} module:engine/view/domconverter~DomConverter#blockFiller\n\t\t */\n\t\tthis.blockFiller = options.blockFiller || BR_FILLER;\n\n\t\t/**\n\t\t * Tag names of DOM `Element`s which are considered pre-formatted elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.} module:engine/view/domconverter~DomConverter#preElements\n\t\t */\n\t\tthis.preElements = [ 'pre' ];\n\n\t\t/**\n\t\t * Tag names of DOM `Element`s which are considered block elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.} module:engine/view/domconverter~DomConverter#blockElements\n\t\t */\n\t\tthis.blockElements = [ 'p', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ];\n\n\t\t/**\n\t\t * DOM to View mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_domToViewMapping\n\t\t */\n\t\tthis._domToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * View to DOM mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_viewToDomMapping\n\t\t */\n\t\tthis._viewToDomMapping = new WeakMap();\n\n\t\t/**\n\t\t * Holds mapping between fake selection containers and corresponding view selections.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_fakeSelectionMapping\n\t\t */\n\t\tthis._fakeSelectionMapping = new WeakMap();\n\t}\n\n\t/**\n\t * Binds given DOM element that represents fake selection to {@link module:engine/view/documentselection~DocumentSelection\n\t * document selection}. Document selection copy is stored and can be retrieved by\n\t * {@link module:engine/view/domconverter~DomConverter#fakeSelectionToView} method.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @param {module:engine/view/documentselection~DocumentSelection} viewDocumentSelection\n\t */\n\tbindFakeSelection( domElement, viewDocumentSelection ) {\n\t\tthis._fakeSelectionMapping.set( domElement, new ViewSelection( viewDocumentSelection ) );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/view/selection~Selection view selection} instance corresponding to\n\t * given DOM element that represents fake selection. Returns `undefined` if binding to given DOM element does not exists.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @returns {module:engine/view/selection~Selection|undefined}\n\t */\n\tfakeSelectionToView( domElement ) {\n\t\treturn this._fakeSelectionMapping.get( domElement );\n\t}\n\n\t/**\n\t * Binds DOM and View elements, so it will be possible to get corresponding elements using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {HTMLElement} domElement DOM element to bind.\n\t * @param {module:engine/view/element~Element} viewElement View element to bind.\n\t */\n\tbindElements( domElement, viewElement ) {\n\t\tthis._domToViewMapping.set( domElement, viewElement );\n\t\tthis._viewToDomMapping.set( viewElement, domElement );\n\t}\n\n\t/**\n\t * Unbinds given `domElement` from the view element it was bound to. Unbinding is deep, meaning that all children of\n\t * `domElement` will be unbound too.\n\t *\n\t * @param {HTMLElement} domElement DOM element to unbind.\n\t */\n\tunbindDomElement( domElement ) {\n\t\tconst viewElement = this._domToViewMapping.get( domElement );\n\n\t\tif ( viewElement ) {\n\t\t\tthis._domToViewMapping.delete( domElement );\n\t\t\tthis._viewToDomMapping.delete( viewElement );\n\n\t\t\t// Use Array.from because of MS Edge (#923).\n\t\t\tfor ( const child of Array.from( domElement.childNodes ) ) {\n\t\t\t\tthis.unbindDomElement( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Binds DOM and View document fragments, so it will be possible to get corresponding document fragments using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {DocumentFragment} domFragment DOM document fragment to bind.\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment View document fragment to bind.\n\t */\n\tbindDocumentFragments( domFragment, viewFragment ) {\n\t\tthis._domToViewMapping.set( domFragment, viewFragment );\n\t\tthis._viewToDomMapping.set( viewFragment, domFragment );\n\t}\n\n\t/**\n\t * Converts view to DOM. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View node or document fragment to transform.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @returns {Node|DocumentFragment} Converted node or DocumentFragment.\n\t */\n\tviewToDom( viewNode, domDocument, options = {} ) {\n\t\tif ( viewNode.is( 'text' ) ) {\n\t\t\tconst textData = this._processDataFromViewText( viewNode );\n\n\t\t\treturn domDocument.createTextNode( textData );\n\t\t} else {\n\t\t\tif ( this.mapViewToDom( viewNode ) ) {\n\t\t\t\treturn this.mapViewToDom( viewNode );\n\t\t\t}\n\n\t\t\tlet domElement;\n\n\t\t\tif ( viewNode.is( 'documentFragment' ) ) {\n\t\t\t\t// Create DOM document fragment.\n\t\t\t\tdomElement = domDocument.createDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domElement, viewNode );\n\t\t\t\t}\n\t\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\t\t// UIElement has its own render() method (see #799).\n\t\t\t\tdomElement = viewNode.render( domDocument );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\treturn domElement;\n\t\t\t} else {\n\t\t\t\t// Create DOM element.\n\t\t\t\tdomElement = domDocument.createElement( viewNode.name );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tfor ( const key of viewNode.getAttributeKeys() ) {\n\t\t\t\t\tdomElement.setAttribute( key, viewNode.getAttribute( key ) );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.viewChildrenToDom( viewNode, domDocument, options ) ) {\n\t\t\t\t\tdomElement.appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn domElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the view element to DOM using the\n\t * {@link module:engine/view/domconverter~DomConverter#viewToDom} method.\n\t * Additionally, this method adds block {@link module:engine/view/filler filler} to the list of children, if needed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElement Parent view element.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#viewToDom} options parameter.\n\t * @returns {Iterable.} DOM nodes.\n\t */\n\t* viewChildrenToDom( viewElement, domDocument, options = {} ) {\n\t\tconst fillerPositionOffset = viewElement.getFillerOffset && viewElement.getFillerOffset();\n\t\tlet offset = 0;\n\n\t\tfor ( const childView of viewElement.getChildren() ) {\n\t\t\tif ( fillerPositionOffset === offset ) {\n\t\t\t\tyield this.blockFiller( domDocument );\n\t\t\t}\n\n\t\t\tyield this.viewToDom( childView, domDocument, options );\n\n\t\t\toffset++;\n\t\t}\n\n\t\tif ( fillerPositionOffset === offset ) {\n\t\t\tyield this.blockFiller( domDocument );\n\t\t}\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/range~Range} to DOM range.\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {Range} DOM range.\n\t */\n\tviewRangeToDom( viewRange ) {\n\t\tconst domStart = this.viewPositionToDom( viewRange.start );\n\t\tconst domEnd = this.viewPositionToDom( viewRange.end );\n\n\t\tconst domRange = document.createRange();\n\t\tdomRange.setStart( domStart.parent, domStart.offset );\n\t\tdomRange.setEnd( domEnd.parent, domEnd.offset );\n\n\t\treturn domRange;\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/position~Position} to DOM parent and offset.\n\t *\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t * If the converted position is directly before inline filler it is moved inside the filler.\n\t *\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {Object|null} position DOM position or `null` if view position could not be converted to DOM.\n\t * @returns {Node} position.parent DOM position parent.\n\t * @returns {Number} position.offset DOM position offset.\n\t */\n\tviewPositionToDom( viewPosition ) {\n\t\tconst viewParent = viewPosition.parent;\n\n\t\tif ( viewParent.is( 'text' ) ) {\n\t\t\tconst domParent = this.findCorrespondingDomText( viewParent );\n\n\t\t\tif ( !domParent ) {\n\t\t\t\t// Position is in a view text node that has not been rendered to DOM yet.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tlet offset = viewPosition.offset;\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset += INLINE_FILLER_LENGTH;\n\t\t\t}\n\n\t\t\treturn { parent: domParent, offset };\n\t\t} else {\n\t\t\t// viewParent is instance of ViewElement.\n\t\t\tlet domParent, domBefore, domAfter;\n\n\t\t\tif ( viewPosition.offset === 0 ) {\n\t\t\t\tdomParent = this.mapViewToDom( viewParent );\n\n\t\t\t\tif ( !domParent ) {\n\t\t\t\t\t// Position is in a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomAfter = domParent.childNodes[ 0 ];\n\t\t\t} else {\n\t\t\t\tconst nodeBefore = viewPosition.nodeBefore;\n\n\t\t\t\tdomBefore = nodeBefore.is( 'text' ) ?\n\t\t\t\t\tthis.findCorrespondingDomText( nodeBefore ) :\n\t\t\t\t\tthis.mapViewToDom( viewPosition.nodeBefore );\n\n\t\t\t\tif ( !domBefore ) {\n\t\t\t\t\t// Position is after a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomParent = domBefore.parentNode;\n\t\t\t\tdomAfter = domBefore.nextSibling;\n\t\t\t}\n\n\t\t\t// If there is an inline filler at position return position inside the filler. We should never return\n\t\t\t// the position before the inline filler.\n\t\t\tif ( isText( domAfter ) && startsWithFiller( domAfter ) ) {\n\t\t\t\treturn { parent: domAfter, offset: INLINE_FILLER_LENGTH };\n\t\t\t}\n\n\t\t\tconst offset = domBefore ? indexOf( domBefore ) + 1 : 0;\n\n\t\t\treturn { parent: domParent, offset };\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM to view. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items. For\n\t * {@link module:engine/view/filler fillers} `null` will be returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {Node|DocumentFragment} domNode DOM node or document fragment to transform.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @param {Boolean} [options.keepOriginalCase=false] If `false`, node's tag name will be converter to lower case.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} Converted node or document fragment\n\t * or `null` if DOM node is a {@link module:engine/view/filler filler} or the given node is an empty text node.\n\t */\n\tdomToView( domNode, options = {} ) {\n\t\tif ( isBlockFiller( domNode, this.blockFiller ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// When node is inside UIElement return that UIElement as it's view representation.\n\t\tconst uiElement = this.getParentUIElement( domNode, this._domToViewMapping );\n\n\t\tif ( uiElement ) {\n\t\t\treturn uiElement;\n\t\t}\n\n\t\tif ( isText( domNode ) ) {\n\t\t\tif ( isInlineFiller( domNode ) ) {\n\t\t\t\treturn null;\n\t\t\t} else {\n\t\t\t\tconst textData = this._processDataFromDomText( domNode );\n\n\t\t\t\treturn textData === '' ? null : new ViewText( textData );\n\t\t\t}\n\t\t} else if ( this.isComment( domNode ) ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\tif ( this.mapDomToView( domNode ) ) {\n\t\t\t\treturn this.mapDomToView( domNode );\n\t\t\t}\n\n\t\t\tlet viewElement;\n\n\t\t\tif ( this.isDocumentFragment( domNode ) ) {\n\t\t\t\t// Create view document fragment.\n\t\t\t\tviewElement = new ViewDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domNode, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Create view element.\n\t\t\t\tconst viewName = options.keepOriginalCase ? domNode.tagName : domNode.tagName.toLowerCase();\n\t\t\t\tviewElement = new ViewElement( viewName );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domNode, viewElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tconst attrs = domNode.attributes;\n\n\t\t\t\tfor ( let i = attrs.length - 1; i >= 0; i-- ) {\n\t\t\t\t\tviewElement._setAttribute( attrs[ i ].name, attrs[ i ].value );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.domChildrenToView( domNode, options ) ) {\n\t\t\t\t\tviewElement._appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn viewElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the DOM element to view nodes using\n\t * the {@link module:engine/view/domconverter~DomConverter#domToView} method.\n\t * Additionally this method omits block {@link module:engine/view/filler filler}, if it exists in the DOM parent.\n\t *\n\t * @param {HTMLElement} domElement Parent DOM element.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#domToView} options parameter.\n\t * @returns {Iterable.} View nodes.\n\t */\n\t* domChildrenToView( domElement, options = {} ) {\n\t\tfor ( let i = 0; i < domElement.childNodes.length; i++ ) {\n\t\t\tconst domChild = domElement.childNodes[ i ];\n\t\t\tconst viewChild = this.domToView( domChild, options );\n\n\t\t\tif ( viewChild !== null ) {\n\t\t\t\tyield viewChild;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM selection to view {@link module:engine/view/selection~Selection}.\n\t * Ranges which cannot be converted will be omitted.\n\t *\n\t * @param {Selection} domSelection DOM selection.\n\t * @returns {module:engine/view/selection~Selection} View selection.\n\t */\n\tdomSelectionToView( domSelection ) {\n\t\t// DOM selection might be placed in fake selection container.\n\t\t// If container contains fake selection - return corresponding view selection.\n\t\tif ( domSelection.rangeCount === 1 ) {\n\t\t\tlet container = domSelection.getRangeAt( 0 ).startContainer;\n\n\t\t\t// The DOM selection might be moved to the text node inside the fake selection container.\n\t\t\tif ( isText( container ) ) {\n\t\t\t\tcontainer = container.parentNode;\n\t\t\t}\n\n\t\t\tconst viewSelection = this.fakeSelectionToView( container );\n\n\t\t\tif ( viewSelection ) {\n\t\t\t\treturn viewSelection;\n\t\t\t}\n\t\t}\n\n\t\tconst isBackward = this.isDomSelectionBackward( domSelection );\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( let i = 0; i < domSelection.rangeCount; i++ ) {\n\t\t\t// DOM Range have correct start and end, no matter what is the DOM Selection direction. So we don't have to fix anything.\n\t\t\tconst domRange = domSelection.getRangeAt( i );\n\t\t\tconst viewRange = this.domRangeToView( domRange );\n\n\t\t\tif ( viewRange ) {\n\t\t\t\tviewRanges.push( viewRange );\n\t\t\t}\n\t\t}\n\n\t\treturn new ViewSelection( viewRanges, { backward: isBackward } );\n\t}\n\n\t/**\n\t * Converts DOM Range to view {@link module:engine/view/range~Range}.\n\t * If the start or end position can not be converted `null` is returned.\n\t *\n\t * @param {Range} domRange DOM range.\n\t * @returns {module:engine/view/range~Range|null} View range.\n\t */\n\tdomRangeToView( domRange ) {\n\t\tconst viewStart = this.domPositionToView( domRange.startContainer, domRange.startOffset );\n\t\tconst viewEnd = this.domPositionToView( domRange.endContainer, domRange.endOffset );\n\n\t\tif ( viewStart && viewEnd ) {\n\t\t\treturn new ViewRange( viewStart, viewEnd );\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts DOM parent and offset to view {@link module:engine/view/position~Position}.\n\t *\n\t * If the position is inside a {@link module:engine/view/filler filler} which has no corresponding view node,\n\t * position of the filler will be converted and returned.\n\t *\n\t * If the position is inside DOM element rendered by {@link module:engine/view/uielement~UIElement}\n\t * that position will be converted to view position before that UIElement.\n\t *\n\t * If structures are too different and it is not possible to find corresponding position then `null` will be returned.\n\t *\n\t * @param {Node} domParent DOM position parent.\n\t * @param {Number} domOffset DOM position offset.\n\t * @returns {module:engine/view/position~Position} viewPosition View position.\n\t */\n\tdomPositionToView( domParent, domOffset ) {\n\t\tif ( isBlockFiller( domParent, this.blockFiller ) ) {\n\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t}\n\n\t\t// If position is somewhere inside UIElement - return position before that element.\n\t\tconst viewElement = this.mapDomToView( domParent );\n\n\t\tif ( viewElement && viewElement.is( 'uiElement' ) ) {\n\t\t\treturn ViewPosition._createBefore( viewElement );\n\t\t}\n\n\t\tif ( isText( domParent ) ) {\n\t\t\tif ( isInlineFiller( domParent ) ) {\n\t\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t\t}\n\n\t\t\tconst viewParent = this.findCorrespondingViewText( domParent );\n\t\t\tlet offset = domOffset;\n\n\t\t\tif ( !viewParent ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset -= INLINE_FILLER_LENGTH;\n\t\t\t\toffset = offset < 0 ? 0 : offset;\n\t\t\t}\n\n\t\t\treturn new ViewPosition( viewParent, offset );\n\t\t}\n\t\t// domParent instanceof HTMLElement.\n\t\telse {\n\t\t\tif ( domOffset === 0 ) {\n\t\t\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t\t\tif ( viewParent ) {\n\t\t\t\t\treturn new ViewPosition( viewParent, 0 );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst domBefore = domParent.childNodes[ domOffset - 1 ];\n\t\t\t\tconst viewBefore = isText( domBefore ) ?\n\t\t\t\t\tthis.findCorrespondingViewText( domBefore ) :\n\t\t\t\t\tthis.mapDomToView( domBefore );\n\n\t\t\t\t// TODO #663\n\t\t\t\tif ( viewBefore && viewBefore.parent ) {\n\t\t\t\t\treturn new ViewPosition( viewBefore.parent, viewBefore.index + 1 );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns corresponding view {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment} for provided DOM element or\n\t * document fragment. If there is no view item {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * to the given DOM - `undefined` is returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {DocumentFragment|Element} domElementOrDocumentFragment DOM element or document fragment.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|undefined}\n\t * Corresponding view element, document fragment or `undefined` if no element was bound.\n\t */\n\tmapDomToView( domElementOrDocumentFragment ) {\n\t\treturn this.getParentUIElement( domElementOrDocumentFragment ) || this._domToViewMapping.get( domElementOrDocumentFragment );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * For all text nodes rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * Note that for the block or inline {@link module:engine/view/filler filler} this method returns `null`.\n\t *\n\t * @param {Text} domText DOM text node.\n\t * @returns {module:engine/view/text~Text|null} Corresponding view text node or `null`, if it was not possible to find a\n\t * corresponding node.\n\t */\n\tfindCorrespondingViewText( domText ) {\n\t\tif ( isInlineFiller( domText ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// If DOM text was rendered by UIElement - return that element.\n\t\tconst uiElement = this.getParentUIElement( domText );\n\n\t\tif ( uiElement ) {\n\t\t\treturn uiElement;\n\t\t}\n\n\t\tconst previousSibling = domText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling ) {\n\t\t\tif ( !( this.isElement( previousSibling ) ) ) {\n\t\t\t\t// The previous is text or comment.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewElement = this.mapDomToView( previousSibling );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst nextSibling = viewElement.nextSibling;\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( nextSibling instanceof ViewText ) {\n\t\t\t\t\treturn viewElement.nextSibling;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t// Try to use parent to find the corresponding text node.\n\t\telse {\n\t\t\tconst viewElement = this.mapDomToView( domText.parentNode );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst firstChild = viewElement.getChild( 0 );\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( firstChild instanceof ViewText ) {\n\t\t\t\t\treturn firstChild;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns corresponding DOM item for provided {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment}.\n\t * To find a corresponding text for {@link module:engine/view/text~Text view Text instance}\n\t * use {@link #findCorrespondingDomText}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View element or document fragment.\n\t * @returns {Node|DocumentFragment|undefined} Corresponding DOM node or document fragment.\n\t */\n\tmapViewToDom( documentFragmentOrElement ) {\n\t\treturn this._viewToDomMapping.get( documentFragmentOrElement );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} viewText View text node.\n\t * @returns {Text|null} Corresponding DOM text node or `null`, if it was not possible to find a corresponding node.\n\t */\n\tfindCorrespondingDomText( viewText ) {\n\t\tconst previousSibling = viewText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling && this.mapViewToDom( previousSibling ) ) {\n\t\t\treturn this.mapViewToDom( previousSibling ).nextSibling;\n\t\t}\n\n\t\t// If this is a first node, try to use parent to find the corresponding text node.\n\t\tif ( !previousSibling && viewText.parent && this.mapViewToDom( viewText.parent ) ) {\n\t\t\treturn this.mapViewToDom( viewText.parent ).childNodes[ 0 ];\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Focuses DOM editable that is corresponding to provided {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t * @param {module:engine/view/editableelement~EditableElement} viewEditable\n\t */\n\tfocus( viewEditable ) {\n\t\tconst domEditable = this.mapViewToDom( viewEditable );\n\n\t\tif ( domEditable && domEditable.ownerDocument.activeElement !== domEditable ) {\n\t\t\t// Save the scrollX and scrollY positions before the focus.\n\t\t\tconst { scrollX, scrollY } = global.window;\n\t\t\tconst scrollPositions = [];\n\n\t\t\t// Save all scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst { scrollLeft, scrollTop } = node;\n\n\t\t\t\tscrollPositions.push( [ scrollLeft, scrollTop ] );\n\t\t\t} );\n\n\t\t\tdomEditable.focus();\n\n\t\t\t// Restore scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/957\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst [ scrollLeft, scrollTop ] = scrollPositions.shift();\n\n\t\t\t\tnode.scrollLeft = scrollLeft;\n\t\t\t\tnode.scrollTop = scrollTop;\n\t\t\t} );\n\n\t\t\t// Restore the scrollX and scrollY positions after the focus.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\tglobal.window.scrollTo( scrollX, scrollY );\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.ELEMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisElement( node ) {\n\t\treturn node && node.nodeType == Node.ELEMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.DOCUMENT_FRAGMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisDocumentFragment( node ) {\n\t\treturn node && node.nodeType == Node.DOCUMENT_FRAGMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.COMMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisComment( node ) {\n\t\treturn node && node.nodeType == Node.COMMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` if given selection is a backward selection, that is, if it's `focus` is before `anchor`.\n\t *\n\t * @param {Selection} DOM Selection instance to check.\n\t * @returns {Boolean}\n\t */\n\tisDomSelectionBackward( selection ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Since it takes multiple lines of code to check whether a \"DOM Position\" is before/after another \"DOM Position\",\n\t\t// we will use the fact that range will collapse if it's end is before it's start.\n\t\tconst range = document.createRange();\n\n\t\trange.setStart( selection.anchorNode, selection.anchorOffset );\n\t\trange.setEnd( selection.focusNode, selection.focusOffset );\n\n\t\tconst backward = range.collapsed;\n\n\t\trange.detach();\n\n\t\treturn backward;\n\t}\n\n\t/**\n\t * Returns parent {@link module:engine/view/uielement~UIElement} for provided DOM node. Returns `null` if there is no\n\t * parent UIElement.\n\t *\n\t * @param {Node} domNode\n\t * @returns {module:engine/view/uielement~UIElement|null}\n\t */\n\tgetParentUIElement( domNode ) {\n\t\tconst ancestors = getAncestors( domNode );\n\n\t\t// Remove domNode from the list.\n\t\tancestors.pop();\n\n\t\twhile ( ancestors.length ) {\n\t\t\tconst domNode = ancestors.pop();\n\t\t\tconst viewNode = this._domToViewMapping.get( domNode );\n\n\t\t\tif ( viewNode && viewNode.is( 'uiElement' ) ) {\n\t\t\t\treturn viewNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks if given selection's boundaries are at correct places.\n\t *\n\t * The following places are considered as incorrect for selection boundaries:\n\t * * before or in the middle of the inline filler sequence,\n\t * * inside the DOM element which represents {@link module:engine/view/uielement~UIElement a view ui element}.\n\t *\n\t * @param {Selection} domSelection DOM Selection object to be checked.\n\t * @returns {Boolean} `true` if the given selection is at a correct place, `false` otherwise.\n\t */\n\tisDomSelectionCorrect( domSelection ) {\n\t\treturn this._isDomSelectionPositionCorrect( domSelection.anchorNode, domSelection.anchorOffset ) &&\n\t\t\tthis._isDomSelectionPositionCorrect( domSelection.focusNode, domSelection.focusOffset );\n\t}\n\n\t/**\n\t * Checks if the given DOM position is a correct place for selection boundary. See {@link #isDomSelectionCorrect}.\n\t *\n\t * @private\n\t * @param {Element} domParent Position parent.\n\t * @param {Number} offset Position offset.\n\t * @returns {Boolean} `true` if given position is at a correct place for selection boundary, `false` otherwise.\n\t */\n\t_isDomSelectionPositionCorrect( domParent, offset ) {\n\t\t// If selection is before or in the middle of inline filler string, it is incorrect.\n\t\tif ( isText( domParent ) && startsWithFiller( domParent ) && offset < INLINE_FILLER_LENGTH ) {\n\t\t\t// Selection in a text node, at wrong position (before or in the middle of filler).\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isElement( domParent ) && startsWithFiller( domParent.childNodes[ offset ] ) ) {\n\t\t\t// Selection in an element node, before filler text node.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t// If selection is in `view.UIElement`, it is incorrect. Note that `mapDomToView()` returns `view.UIElement`\n\t\t// also for any dom element that is inside the view ui element (so we don't need to perform any additional checks).\n\t\tif ( viewParent && viewParent.is( 'uiElement' ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Takes text data from a given {@link module:engine/view/text~Text#data} and processes it so\n\t * it is correctly displayed in the DOM.\n\t *\n\t * Following changes are done:\n\t *\n\t * * a space at the beginning is changed to ` ` if this is the first text node in its container\n\t * element or if a previous text node ends with a space character,\n\t * * space at the end of the text node is changed to ` ` if this is the last text node in its container,\n\t * * remaining spaces are replaced to a chain of spaces and ` ` (e.g. `'x x'` becomes `'x   x'`).\n\t *\n\t * Content of {@link #preElements} is not processed.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node View text node to process.\n\t * @returns {String} Processed text data.\n\t */\n\t_processDataFromViewText( node ) {\n\t\tlet data = node.data;\n\n\t\t// If any of node ancestors has a name which is in `preElements` array, then currently processed\n\t\t// view text node is (will be) in preformatted element. We should not change whitespaces then.\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn data;\n\t\t}\n\n\t\t// 1. Replace the first space with a nbsp if the previous node ends with a space or there is no previous node\n\t\t// (container element boundary).\n\t\tif ( data.charAt( 0 ) == ' ' ) {\n\t\t\tconst prevNode = this._getTouchingViewTextNode( node, false );\n\t\t\tconst prevEndsWithSpace = prevNode && this._nodeEndsWithSpace( prevNode );\n\n\t\t\tif ( prevEndsWithSpace || !prevNode ) {\n\t\t\t\tdata = '\\u00A0' + data.substr( 1 );\n\t\t\t}\n\t\t}\n\n\t\t// 2. Replace the last space with a nbsp if this is the last text node (container element boundary).\n\t\tif ( data.charAt( data.length - 1 ) == ' ' ) {\n\t\t\tconst nextNode = this._getTouchingViewTextNode( node, true );\n\n\t\t\tif ( !nextNode ) {\n\t\t\t\tdata = data.substr( 0, data.length - 1 ) + '\\u00A0';\n\t\t\t}\n\t\t}\n\n\t\treturn data.replace( / {2}/g, ' \\u00A0' );\n\t}\n\n\t/**\n\t * Checks whether given node ends with a space character after changing appropriate space characters to ` `s.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node Node to check.\n\t * @returns {Boolean} `true` if given `node` ends with space, `false` otherwise.\n\t */\n\t_nodeEndsWithSpace( node ) {\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst data = this._processDataFromViewText( node );\n\n\t\treturn data.charAt( data.length - 1 ) == ' ';\n\t}\n\n\t/**\n\t * Takes text data from native `Text` node and processes it to a correct {@link module:engine/view/text~Text view text node} data.\n\t *\n\t * Following changes are done:\n\t *\n\t * * multiple whitespaces are replaced to a single space,\n\t * * space at the beginning of a text node is removed if it is the first text node in its container\n\t * element or if the previous text node ends with a space character,\n\t * * space at the end of the text node is removed, if it is the last text node in its container.\n\t *\n\t * @param {Node} node DOM text node to process.\n\t * @returns {String} Processed data.\n\t * @private\n\t */\n\t_processDataFromDomText( node ) {\n\t\tlet data = node.data;\n\n\t\tif ( _hasDomParentOfType( node, this.preElements ) ) {\n\t\t\treturn getDataWithoutFiller( node );\n\t\t}\n\n\t\t// Change all consecutive whitespace characters (from the [ \\n\\t\\r] set –\n\t\t// see https://github.com/ckeditor/ckeditor5-engine/issues/822#issuecomment-311670249) to a single space character.\n\t\t// That's how multiple whitespaces are treated when rendered, so we normalize those whitespaces.\n\t\t// We're replacing 1+ (and not 2+) to also normalize singular \\n\\t\\r characters (#822).\n\t\tdata = data.replace( /[ \\n\\t\\r]{1,}/g, ' ' );\n\n\t\tconst prevNode = this._getTouchingInlineDomNode( node, false );\n\t\tconst nextNode = this._getTouchingInlineDomNode( node, true );\n\n\t\tconst shouldLeftTrim = this._checkShouldLeftTrimDomText( prevNode );\n\t\tconst shouldRightTrim = this._checkShouldRightTrimDomText( node, nextNode );\n\n\t\t// If the previous dom text node does not exist or it ends by whitespace character, remove space character from the beginning\n\t\t// of this text node. Such space character is treated as a whitespace.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^ /, '' );\n\t\t}\n\n\t\t// If the next text node does not exist remove space character from the end of this text node.\n\t\tif ( shouldRightTrim ) {\n\t\t\tdata = data.replace( / $/, '' );\n\t\t}\n\n\t\t// At the beginning and end of a block element, Firefox inserts normal space +
instead of non-breaking space.\n\t\t// This means that the text node starts/end with normal space instead of non-breaking space.\n\t\t// This causes a problem because the normal space would be removed in `.replace` calls above. To prevent that,\n\t\t// the inline filler is removed only after the data is initially processed (by the `.replace` above). See ckeditor5#692.\n\t\tdata = getDataWithoutFiller( new Text( data ) );\n\n\t\t// At this point we should have removed all whitespaces from DOM text data.\n\n\t\t// Now we have to change   chars, that were in DOM text data because of rendering reasons, to spaces.\n\t\t// First, change all ` \\u00A0` pairs (space +  ) to two spaces. DOM converter changes two spaces from model/view as\n\t\t// ` \\u00A0` to ensure proper rendering. Since here we convert back, we recognize those pairs and change them\n\t\t// to ` ` which is what we expect to have in model/view.\n\t\tdata = data.replace( / \\u00A0/g, ' ' );\n\n\t\t// Then, change   character that is at the beginning of the text node to space character.\n\t\t// As above, that   was created for rendering reasons but it's real meaning is just a space character.\n\t\t// We do that replacement only if this is the first node or the previous node ends on whitespace character.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^\\u00A0/, ' ' );\n\t\t}\n\n\t\t// Since input text data could be: `x_ _`, we would not replace the first   after `x` character.\n\t\t// We have to fix it. Since we already change all `  `, we will have something like this at the end of text data:\n\t\t// `x_ _ _` -> `x_ `. Find   at the end of string (can be followed only by spaces).\n\t\t// We do that replacement only if this is the last node or the next node starts with   or is a
.\n\t\tif ( isText( nextNode ) ? nextNode.data.charAt( 0 ) == '\\u00A0' : true ) {\n\t\t\tdata = data.replace( /\\u00A0( *)$/, ' $1' );\n\t\t}\n\n\t\t// At this point, all whitespaces should be removed and all   created for rendering reasons should be\n\t\t// changed to normal space. All left   are   inserted intentionally.\n\t\treturn data;\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, preceded by the given `prevNode` should\n\t * be trimmed from the left side.\n\t *\n\t * @param {Node} prevNode\n\t */\n\t_checkShouldLeftTrimDomText( prevNode ) {\n\t\tif ( !prevNode ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( isElement( prevNode ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn /[^\\S\\u00A0]/.test( prevNode.data.charAt( prevNode.data.length - 1 ) );\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, succeeded by the given `nextNode` should\n\t * be trimmed from the right side.\n\t *\n\t * @param {Node} node\n\t * @param {Node} prevNode\n\t */\n\t_checkShouldRightTrimDomText( node, nextNode ) {\n\t\tif ( nextNode ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !startsWithFiller( node );\n\t}\n\n\t/**\n\t * Helper function. For given {@link module:engine/view/text~Text view text node}, it finds previous or next sibling\n\t * that is contained in the same container element. If there is no such sibling, `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} node Reference node.\n\t * @param {Boolean} getNext\n\t * @returns {module:engine/view/text~Text|null} Touching text node or `null` if there is no next or previous touching text node.\n\t */\n\t_getTouchingViewTextNode( node, getNext ) {\n\t\tconst treeWalker = new ViewTreeWalker( {\n\t\t\tstartPosition: getNext ? ViewPosition._createAfter( node ) : ViewPosition._createBefore( node ),\n\t\t\tdirection: getNext ? 'forward' : 'backward'\n\t\t} );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\t// ViewContainerElement is found on a way to next ViewText node, so given `node` was first/last\n\t\t\t// text node in its container element.\n\t\t\tif ( value.item.is( 'containerElement' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t//
found – it works like a block boundary, so do not scan further.\n\t\t\telse if ( value.item.is( 'br' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// Found a text node in the same container element.\n\t\t\telse if ( value.item.is( 'textProxy' ) ) {\n\t\t\t\treturn value.item;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Helper function. For the given text node, it finds the closest touching node which is either\n\t * a text node or a `
`. The search is terminated at block element boundaries and if a matching node\n\t * wasn't found so far, `null` is returned.\n\t *\n\t * In the following DOM structure:\n\t *\n\t *\t\t

foobar
bom

\n\t *\n\t * * `foo` doesn't have its previous touching inline node (`null` is returned),\n\t * * `foo`'s next touching inline node is `bar`\n\t * * `bar`'s next touching inline node is `
`\n\t *\n\t * This method returns text nodes and `
` elements because these types of nodes affect how\n\t * spaces in the given text node need to be converted.\n\t *\n\t * @private\n\t * @param {Text} node\n\t * @param {Boolean} getNext\n\t * @returns {Text|Element|null}\n\t */\n\t_getTouchingInlineDomNode( node, getNext ) {\n\t\tif ( !node.parentNode ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst direction = getNext ? 'nextNode' : 'previousNode';\n\t\tconst document = node.ownerDocument;\n\t\tconst topmostParent = getAncestors( node )[ 0 ];\n\n\t\tconst treeWalker = document.createTreeWalker( topmostParent, NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT, {\n\t\t\tacceptNode( node ) {\n\t\t\t\tif ( isText( node ) ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\tif ( node.tagName == 'BR' ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\treturn NodeFilter.FILTER_SKIP;\n\t\t\t}\n\t\t} );\n\n\t\ttreeWalker.currentNode = node;\n\n\t\tconst touchingNode = treeWalker[ direction ]();\n\n\t\tif ( touchingNode !== null ) {\n\t\t\tconst lca = getCommonAncestor( node, touchingNode );\n\n\t\t\t// If there is common ancestor between the text node and next/prev text node,\n\t\t\t// and there are no block elements on a way from the text node to that ancestor,\n\t\t\t// and there are no block elements on a way from next/prev text node to that ancestor...\n\t\t\tif (\n\t\t\t\tlca &&\n\t\t\t\t!_hasDomParentOfType( node, this.blockElements, lca ) &&\n\t\t\t\t!_hasDomParentOfType( touchingNode, this.blockElements, lca )\n\t\t\t) {\n\t\t\t\t// Then they are in the same container element.\n\t\t\t\treturn touchingNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n}\n\n// Helper function.\n// Used to check if given native `Element` or `Text` node has parent with tag name from `types` array.\n//\n// @param {Node} node\n// @param {Array.} types\n// @param {Boolean} [boundaryParent] Can be given if parents should be checked up to a given element (excluding that element).\n// @returns {Boolean} `true` if such parent exists or `false` if it does not.\nfunction _hasDomParentOfType( node, types, boundaryParent ) {\n\tlet parents = getAncestors( node );\n\n\tif ( boundaryParent ) {\n\t\tparents = parents.slice( parents.indexOf( boundaryParent ) + 1 );\n\t}\n\n\treturn parents.some( parent => parent.tagName && types.includes( parent.tagName.toLowerCase() ) );\n}\n\n// A helper that executes given callback for each DOM node's ancestor, starting from the given node\n// and ending in document#documentElement.\n//\n// @param {Node} node\n// @param {Function} callback A callback to be executed for each ancestor.\nfunction forEachDomNodeAncestor( node, callback ) {\n\twhile ( node && node != global.document ) {\n\t\tcallback( node );\n\t\tnode = node.parentNode;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/getcommonancestor\n */\n\nimport getAncestors from './getancestors';\n\n/**\n * Searches and returns the lowest common ancestor of two given nodes.\n *\n * @param {Node} nodeA First node.\n * @param {Node} nodeB Second node.\n * @returns {Node|DocumentFragment|Document|null} Lowest common ancestor of both nodes or `null` if nodes do not have a common ancestor.\n */\nexport default function getCommonAncestor( nodeA, nodeB ) {\n\tconst ancestorsA = getAncestors( nodeA );\n\tconst ancestorsB = getAncestors( nodeB );\n\n\tlet i = 0;\n\n\t// It does not matter which array is shorter.\n\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\ti++;\n\t}\n\n\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/iswindow\n */\n\n/**\n * Checks if the object is a native DOM Window.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isWindow( obj ) {\n\tconst stringifiedObject = Object.prototype.toString.apply( obj );\n\n\t// Returns `true` for the `window` object in browser environments.\n\tif ( stringifiedObject == '[object Window]' ) {\n\t\treturn true;\n\t}\n\n\t// Returns `true` for the `window` object in the Electron environment.\n\tif ( stringifiedObject == '[object global]' ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/emittermixin\n */\n\nimport { default as EmitterMixin, _getEmitterListenedTo, _setEmitterId } from '../emittermixin';\nimport uid from '../uid';\nimport isNode from './isnode';\nimport isWindow from './iswindow';\nimport { extend } from 'lodash-es';\n\n/**\n * Mixin that injects the DOM events API into its host. It provides the API\n * compatible with {@link module:utils/emittermixin~EmitterMixin}.\n *\n * DOM emitter mixin is by default available in the {@link module:ui/view~View} class,\n * but it can also be mixed into any other class:\n *\n *\t\timport mix from '../utils/mix.js';\n *\t\timport DomEmitterMixin from '../utils/dom/emittermixin.js';\n *\n *\t\tclass SomeView {}\n *\t\tmix( SomeView, DomEmitterMixin );\n *\n *\t\tconst view = new SomeView();\n *\t\tview.listenTo( domElement, ( evt, domEvt ) => {\n *\t\t\tconsole.log( evt, domEvt );\n *\t\t} );\n *\n * @mixin EmitterMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n */\nconst DomEmitterMixin = extend( {}, EmitterMixin, {\n\t/**\n\t * Registers a callback function to be executed when an event is fired in a specific Emitter or DOM Node.\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} emitter The object that fires the event.\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n\t * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n\t * order they were added.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t */\n\tlistenTo( emitter, ...rest ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with\n\t\t// corresponding ProxyEmitter (or create one if not existing).\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter ) || new ProxyEmitter( emitter );\n\n\t\t\tproxy.attach( ...rest );\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.listenTo.call( this, emitter, ...rest );\n\t},\n\n\t/**\n\t * Stops listening for events. It can be used at different levels:\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * * To stop listening to a specific callback.\n\t * * To stop listening to a specific event.\n\t * * To stop listening to all events fired by a specific object.\n\t * * To stop listening to all events fired by all object.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n\t * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n\t * for all events from `emitter`.\n\t * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n\t * `event`.\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with corresponding ProxyEmitter.\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter );\n\n\t\t\t// Element has no listeners.\n\t\t\tif ( !proxy ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.stopListening.call( this, emitter, event, callback );\n\n\t\tif ( emitter instanceof ProxyEmitter ) {\n\t\t\temitter.detach( event );\n\t\t}\n\t},\n\n\t/**\n\t * Retrieves ProxyEmitter instance for given DOM Node residing in this Host.\n\t *\n\t * @pivate\n\t * @param {Node} node DOM Node of the ProxyEmitter.\n\t * @returns {module:utils/dom/emittermixin~ProxyEmitter} ProxyEmitter instance or null.\n\t */\n\t_getProxyEmitter( node ) {\n\t\treturn _getEmitterListenedTo( this, getNodeUID( node ) );\n\t}\n} );\n\nexport default DomEmitterMixin;\n\n/**\n * Creates a ProxyEmitter instance. Such an instance is a bridge between a DOM Node firing events\n * and any Host listening to them. It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#on}.\n *\n * listenTo( click, ... )\n * +-----------------------------------------+\n * | stopListening( ... ) |\n * +----------------------------+ | addEventListener( click, ... )\n * | Host | | +---------------------------------------------+\n * +----------------------------+ | | removeEventListener( click, ... ) |\n * | _listeningTo: { | +----------v-------------+ |\n * | UID: { | | ProxyEmitter | |\n * | emitter: ProxyEmitter, | +------------------------+ +------------v----------+\n * | callbacks: { | | events: { | | Node (HTMLElement) |\n * | click: [ callbacks ] | | click: [ callbacks ] | +-----------------------+\n * | } | | }, | | data-ck-expando: UID |\n * | } | | _domNode: Node, | +-----------------------+\n * | } | | _domListeners: {}, | |\n * | +------------------------+ | | _emitterId: UID | |\n * | | DomEmitterMixin | | +--------------^---------+ |\n * | +------------------------+ | | | |\n * +--------------^-------------+ | +---------------------------------------------+\n * | | click (DOM Event)\n * +-----------------------------------------+\n * fire( click, DOM Event )\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n * @private\n */\nclass ProxyEmitter {\n\t/**\n\t * @param {Node} node DOM Node that fires events.\n\t * @returns {Object} ProxyEmitter instance bound to the DOM Node.\n\t */\n\tconstructor( node ) {\n\t\t// Set emitter ID to match DOM Node \"expando\" property.\n\t\t_setEmitterId( this, getNodeUID( node ) );\n\n\t\t// Remember the DOM Node this ProxyEmitter is bound to.\n\t\tthis._domNode = node;\n\t}\n}\n\nextend( ProxyEmitter.prototype, EmitterMixin, {\n\t/**\n\t * Collection of native DOM listeners.\n\t *\n\t * @private\n\t * @member {Object} module:utils/dom/emittermixin~ProxyEmitter#_domListeners\n\t */\n\n\t/**\n\t * Registers a callback function to be executed when an event is fired.\n\t *\n\t * It attaches a native DOM listener to the DOM Node. When fired,\n\t * a corresponding Emitter event will also fire with DOM Event object as an argument.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#attach\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t */\n\tattach( event, callback, options = {} ) {\n\t\t// If the DOM Listener for given event already exist it is pointless\n\t\t// to attach another one.\n\t\tif ( this._domListeners && this._domListeners[ event ] ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domListener = this._createDomListener( event, !!options.useCapture );\n\n\t\t// Attach the native DOM listener to DOM Node.\n\t\tthis._domNode.addEventListener( event, domListener, !!options.useCapture );\n\n\t\tif ( !this._domListeners ) {\n\t\t\tthis._domListeners = {};\n\t\t}\n\n\t\t// Store the native DOM listener in this ProxyEmitter. It will be helpful\n\t\t// when stopping listening to the event.\n\t\tthis._domListeners[ event ] = domListener;\n\t},\n\n\t/**\n\t * Stops executing the callback on the given event.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#detach\n\t * @param {String} event The name of the event.\n\t */\n\tdetach( event ) {\n\t\tlet events;\n\n\t\t// Remove native DOM listeners which are orphans. If no callbacks\n\t\t// are awaiting given event, detach native DOM listener from DOM Node.\n\t\t// See: {@link attach}.\n\n\t\tif ( this._domListeners[ event ] && ( !( events = this._events[ event ] ) || !events.callbacks.length ) ) {\n\t\t\tthis._domListeners[ event ].removeListener();\n\t\t}\n\t},\n\n\t/**\n\t * Creates a native DOM listener callback. When the native DOM event\n\t * is fired it will fire corresponding event on this ProxyEmitter.\n\t * Note: A native DOM Event is passed as an argument.\n\t *\n\t * @private\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#_createDomListener\n\t * @param {String} event The name of the event.\n\t * @param {Boolean} useCapture Indicates whether the listener was created for capturing event.\n\t * @returns {Function} The DOM listener callback.\n\t */\n\t_createDomListener( event, useCapture ) {\n\t\tconst domListener = domEvt => {\n\t\t\tthis.fire( event, domEvt );\n\t\t};\n\n\t\t// Supply the DOM listener callback with a function that will help\n\t\t// detach it from the DOM Node, when it is no longer necessary.\n\t\t// See: {@link detach}.\n\t\tdomListener.removeListener = () => {\n\t\t\tthis._domNode.removeEventListener( event, domListener, useCapture );\n\t\t\tdelete this._domListeners[ event ];\n\t\t};\n\n\t\treturn domListener;\n\t}\n} );\n\n// Gets an unique DOM Node identifier. The identifier will be set if not defined.\n//\n// @private\n// @param {Node} node\n// @returns {String} UID for given DOM Node.\nfunction getNodeUID( node ) {\n\treturn node[ 'data-ck-expando' ] || ( node[ 'data-ck-expando' ] = uid() );\n}\n\n/**\n * Interface representing classes which mix in {@link module:utils/dom/emittermixin~EmitterMixin}.\n *\n * @interface Emitter\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/observer\n */\n\nimport DomEmitterMixin from '@ckeditor/ckeditor5-utils/src/dom/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Abstract base observer class. Observers are classes which listen to DOM events, do the preliminary\n * processing and fire events on the {@link module:engine/view/document~Document} objects.\n * Observers can also add features to the view, for instance by updating its status or marking elements\n * which need refresh on DOM events.\n *\n * @abstract\n */\nexport default class Observer {\n\t/**\n\t * Creates an instance of the observer.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View}\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/document~Document} object.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * State of the observer. If it is disabled events will not be fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Enables the observer. This method is called when the observer is registered to the\n\t * {@link module:engine/view/view~View} and after {@link module:engine/view/view~View#render rendering}\n\t * (all observers are {@link #disable disabled} before rendering).\n\t *\n\t * A typical use case for disabling observers is that mutation observers need to be disabled for the rendering.\n\t * However, a child class may not need to be disabled, so it can implement an empty method.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#disable\n\t */\n\tenable() {\n\t\tthis.isEnabled = true;\n\t}\n\n\t/**\n\t * Disables the observer. This method is called before\n\t * {@link module:engine/view/view~View#render rendering} to prevent firing events during rendering.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#enable\n\t */\n\tdisable() {\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Disables and destroys the observer, among others removes event listeners created by the observer.\n\t */\n\tdestroy() {\n\t\tthis.disable();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Starts observing the given root element.\n\t *\n\t * @method #observe\n\t * @param {HTMLElement} domElement\n\t * @param {String} name The name of the root element.\n\t */\n}\n\nmix( Observer, DomEmitterMixin );\n","/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Adds `value` to the array cache.\n *\n * @private\n * @name add\n * @memberOf SetCache\n * @alias push\n * @param {*} value The value to cache.\n * @returns {Object} Returns the cache instance.\n */\nfunction setCacheAdd(value) {\n this.__data__.set(value, HASH_UNDEFINED);\n return this;\n}\n\nexport default setCacheAdd;\n","/**\n * Checks if `value` is in the array cache.\n *\n * @private\n * @name has\n * @memberOf SetCache\n * @param {*} value The value to search for.\n * @returns {number} Returns `true` if `value` is found, else `false`.\n */\nfunction setCacheHas(value) {\n return this.__data__.has(value);\n}\n\nexport default setCacheHas;\n","import MapCache from './_MapCache.js';\nimport setCacheAdd from './_setCacheAdd.js';\nimport setCacheHas from './_setCacheHas.js';\n\n/**\n *\n * Creates an array cache object to store unique values.\n *\n * @private\n * @constructor\n * @param {Array} [values] The values to cache.\n */\nfunction SetCache(values) {\n var index = -1,\n length = values == null ? 0 : values.length;\n\n this.__data__ = new MapCache;\n while (++index < length) {\n this.add(values[index]);\n }\n}\n\n// Add methods to `SetCache`.\nSetCache.prototype.add = SetCache.prototype.push = setCacheAdd;\nSetCache.prototype.has = setCacheHas;\n\nexport default SetCache;\n","/**\n * A specialized version of `_.some` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n * else `false`.\n */\nfunction arraySome(array, predicate) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (predicate(array[index], index, array)) {\n return true;\n }\n }\n return false;\n}\n\nexport default arraySome;\n","/**\n * Checks if a `cache` value for `key` exists.\n *\n * @private\n * @param {Object} cache The cache to query.\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction cacheHas(cache, key) {\n return cache.has(key);\n}\n\nexport default cacheHas;\n","import SetCache from './_SetCache.js';\nimport arraySome from './_arraySome.js';\nimport cacheHas from './_cacheHas.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1,\n COMPARE_UNORDERED_FLAG = 2;\n\n/**\n * A specialized version of `baseIsEqualDeep` for arrays with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Array} array The array to compare.\n * @param {Array} other The other array to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `array` and `other` objects.\n * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.\n */\nfunction equalArrays(array, other, bitmask, customizer, equalFunc, stack) {\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n arrLength = array.length,\n othLength = other.length;\n\n if (arrLength != othLength && !(isPartial && othLength > arrLength)) {\n return false;\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(array);\n if (stacked && stack.get(other)) {\n return stacked == other;\n }\n var index = -1,\n result = true,\n seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;\n\n stack.set(array, other);\n stack.set(other, array);\n\n // Ignore non-index properties.\n while (++index < arrLength) {\n var arrValue = array[index],\n othValue = other[index];\n\n if (customizer) {\n var compared = isPartial\n ? customizer(othValue, arrValue, index, other, array, stack)\n : customizer(arrValue, othValue, index, array, other, stack);\n }\n if (compared !== undefined) {\n if (compared) {\n continue;\n }\n result = false;\n break;\n }\n // Recursively compare arrays (susceptible to call stack limits).\n if (seen) {\n if (!arraySome(other, function(othValue, othIndex) {\n if (!cacheHas(seen, othIndex) &&\n (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {\n return seen.push(othIndex);\n }\n })) {\n result = false;\n break;\n }\n } else if (!(\n arrValue === othValue ||\n equalFunc(arrValue, othValue, bitmask, customizer, stack)\n )) {\n result = false;\n break;\n }\n }\n stack['delete'](array);\n stack['delete'](other);\n return result;\n}\n\nexport default equalArrays;\n","/**\n * Converts `map` to its key-value pairs.\n *\n * @private\n * @param {Object} map The map to convert.\n * @returns {Array} Returns the key-value pairs.\n */\nfunction mapToArray(map) {\n var index = -1,\n result = Array(map.size);\n\n map.forEach(function(value, key) {\n result[++index] = [key, value];\n });\n return result;\n}\n\nexport default mapToArray;\n","/**\n * Converts `set` to an array of its values.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the values.\n */\nfunction setToArray(set) {\n var index = -1,\n result = Array(set.size);\n\n set.forEach(function(value) {\n result[++index] = value;\n });\n return result;\n}\n\nexport default setToArray;\n","import Symbol from './_Symbol.js';\nimport Uint8Array from './_Uint8Array.js';\nimport eq from './eq.js';\nimport equalArrays from './_equalArrays.js';\nimport mapToArray from './_mapToArray.js';\nimport setToArray from './_setToArray.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1,\n COMPARE_UNORDERED_FLAG = 2;\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n dateTag = '[object Date]',\n errorTag = '[object Error]',\n mapTag = '[object Map]',\n numberTag = '[object Number]',\n regexpTag = '[object RegExp]',\n setTag = '[object Set]',\n stringTag = '[object String]',\n symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n dataViewTag = '[object DataView]';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * A specialized version of `baseIsEqualDeep` for comparing objects of\n * the same `toStringTag`.\n *\n * **Note:** This function only supports comparing values with tags of\n * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {string} tag The `toStringTag` of the objects to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {\n switch (tag) {\n case dataViewTag:\n if ((object.byteLength != other.byteLength) ||\n (object.byteOffset != other.byteOffset)) {\n return false;\n }\n object = object.buffer;\n other = other.buffer;\n\n case arrayBufferTag:\n if ((object.byteLength != other.byteLength) ||\n !equalFunc(new Uint8Array(object), new Uint8Array(other))) {\n return false;\n }\n return true;\n\n case boolTag:\n case dateTag:\n case numberTag:\n // Coerce booleans to `1` or `0` and dates to milliseconds.\n // Invalid dates are coerced to `NaN`.\n return eq(+object, +other);\n\n case errorTag:\n return object.name == other.name && object.message == other.message;\n\n case regexpTag:\n case stringTag:\n // Coerce regexes to strings and treat strings, primitives and objects,\n // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring\n // for more details.\n return object == (other + '');\n\n case mapTag:\n var convert = mapToArray;\n\n case setTag:\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG;\n convert || (convert = setToArray);\n\n if (object.size != other.size && !isPartial) {\n return false;\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(object);\n if (stacked) {\n return stacked == other;\n }\n bitmask |= COMPARE_UNORDERED_FLAG;\n\n // Recursively compare objects (susceptible to call stack limits).\n stack.set(object, other);\n var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);\n stack['delete'](object);\n return result;\n\n case symbolTag:\n if (symbolValueOf) {\n return symbolValueOf.call(object) == symbolValueOf.call(other);\n }\n }\n return false;\n}\n\nexport default equalByTag;\n","import getAllKeys from './_getAllKeys.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1;\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqualDeep` for objects with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalObjects(object, other, bitmask, customizer, equalFunc, stack) {\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n objProps = getAllKeys(object),\n objLength = objProps.length,\n othProps = getAllKeys(other),\n othLength = othProps.length;\n\n if (objLength != othLength && !isPartial) {\n return false;\n }\n var index = objLength;\n while (index--) {\n var key = objProps[index];\n if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {\n return false;\n }\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(object);\n if (stacked && stack.get(other)) {\n return stacked == other;\n }\n var result = true;\n stack.set(object, other);\n stack.set(other, object);\n\n var skipCtor = isPartial;\n while (++index < objLength) {\n key = objProps[index];\n var objValue = object[key],\n othValue = other[key];\n\n if (customizer) {\n var compared = isPartial\n ? customizer(othValue, objValue, key, other, object, stack)\n : customizer(objValue, othValue, key, object, other, stack);\n }\n // Recursively compare objects (susceptible to call stack limits).\n if (!(compared === undefined\n ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))\n : compared\n )) {\n result = false;\n break;\n }\n skipCtor || (skipCtor = key == 'constructor');\n }\n if (result && !skipCtor) {\n var objCtor = object.constructor,\n othCtor = other.constructor;\n\n // Non `Object` object instances with different constructors are not equal.\n if (objCtor != othCtor &&\n ('constructor' in object && 'constructor' in other) &&\n !(typeof objCtor == 'function' && objCtor instanceof objCtor &&\n typeof othCtor == 'function' && othCtor instanceof othCtor)) {\n result = false;\n }\n }\n stack['delete'](object);\n stack['delete'](other);\n return result;\n}\n\nexport default equalObjects;\n","import Stack from './_Stack.js';\nimport equalArrays from './_equalArrays.js';\nimport equalByTag from './_equalByTag.js';\nimport equalObjects from './_equalObjects.js';\nimport getTag from './_getTag.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isTypedArray from './isTypedArray.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1;\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n arrayTag = '[object Array]',\n objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqual` for arrays and objects which performs\n * deep comparisons and tracks traversed objects enabling objects with circular\n * references to be compared.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} [stack] Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {\n var objIsArr = isArray(object),\n othIsArr = isArray(other),\n objTag = objIsArr ? arrayTag : getTag(object),\n othTag = othIsArr ? arrayTag : getTag(other);\n\n objTag = objTag == argsTag ? objectTag : objTag;\n othTag = othTag == argsTag ? objectTag : othTag;\n\n var objIsObj = objTag == objectTag,\n othIsObj = othTag == objectTag,\n isSameTag = objTag == othTag;\n\n if (isSameTag && isBuffer(object)) {\n if (!isBuffer(other)) {\n return false;\n }\n objIsArr = true;\n objIsObj = false;\n }\n if (isSameTag && !objIsObj) {\n stack || (stack = new Stack);\n return (objIsArr || isTypedArray(object))\n ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)\n : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);\n }\n if (!(bitmask & COMPARE_PARTIAL_FLAG)) {\n var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),\n othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');\n\n if (objIsWrapped || othIsWrapped) {\n var objUnwrapped = objIsWrapped ? object.value() : object,\n othUnwrapped = othIsWrapped ? other.value() : other;\n\n stack || (stack = new Stack);\n return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);\n }\n }\n if (!isSameTag) {\n return false;\n }\n stack || (stack = new Stack);\n return equalObjects(object, other, bitmask, customizer, equalFunc, stack);\n}\n\nexport default baseIsEqualDeep;\n","import baseIsEqualDeep from './_baseIsEqualDeep.js';\nimport isObjectLike from './isObjectLike.js';\n\n/**\n * The base implementation of `_.isEqual` which supports partial comparisons\n * and tracks traversed objects.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {boolean} bitmask The bitmask flags.\n * 1 - Unordered comparison\n * 2 - Partial comparison\n * @param {Function} [customizer] The function to customize comparisons.\n * @param {Object} [stack] Tracks traversed `value` and `other` objects.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n */\nfunction baseIsEqual(value, other, bitmask, customizer, stack) {\n if (value === other) {\n return true;\n }\n if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {\n return value !== value && other !== other;\n }\n return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);\n}\n\nexport default baseIsEqual;\n","import baseIsEqual from './_baseIsEqual.js';\n\n/**\n * This method is like `_.isEqual` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with up to\n * six arguments: (objValue, othValue [, index|key, object, other, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * function isGreeting(value) {\n * return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, othValue) {\n * if (isGreeting(objValue) && isGreeting(othValue)) {\n * return true;\n * }\n * }\n *\n * var array = ['hello', 'goodbye'];\n * var other = ['hi', 'goodbye'];\n *\n * _.isEqualWith(array, other, customizer);\n * // => true\n */\nfunction isEqualWith(value, other, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n var result = customizer ? customizer(value, other) : undefined;\n return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;\n}\n\nexport default isEqualWith;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/mutationobserver\n */\n\n/* globals window */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { startsWithFiller, getDataWithoutFiller } from '../filler';\nimport { isEqualWith } from 'lodash-es';\n\n/**\n * Mutation observer class observes changes in the DOM, fires {@link module:engine/view/document~Document#event:mutations} event, mark view\n * elements as changed and call {@link module:engine/view/renderer~Renderer#render}.\n * Because all mutated nodes are marked as \"to be rendered\" and the\n * {@link module:engine/view/renderer~Renderer#render} is called, all changes will be reverted, unless the mutation will be handled by the\n * {@link module:engine/view/document~Document#event:mutations} event listener. It means user will see only handled changes, and the editor\n * will block all changes which are not handled.\n *\n * Mutation Observer also take care of reducing number of mutations which are fired. It removes duplicates and\n * mutations on elements which do not have corresponding view elements. Also\n * {@link module:engine/view/observer/mutationobserver~MutatedText text mutation} is fired only if parent element do not change child list.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class MutationObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Native mutation observer config.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {\n\t\t\tchildList: true,\n\t\t\tcharacterData: true,\n\t\t\tcharacterDataOldValue: true,\n\t\t\tsubtree: true\n\t\t};\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#renderer}.\n\t\t *\n\t\t * @member {module:engine/view/renderer~Renderer}\n\t\t */\n\t\tthis.renderer = view._renderer;\n\n\t\t/**\n\t\t * Observed DOM elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.}\n\t\t */\n\t\tthis._domElements = [];\n\n\t\t/**\n\t\t * Native mutation observer.\n\t\t *\n\t\t * @private\n\t\t * @member {MutationObserver}\n\t\t */\n\t\tthis._mutationObserver = new window.MutationObserver( this._onMutations.bind( this ) );\n\t}\n\n\t/**\n\t * Synchronously fires {@link module:engine/view/document~Document#event:mutations} event with all mutations in record queue.\n\t * At the same time empties the queue so mutations will not be fired twice.\n\t */\n\tflush() {\n\t\tthis._onMutations( this._mutationObserver.takeRecords() );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tthis._domElements.push( domElement );\n\n\t\tif ( this.isEnabled ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tenable() {\n\t\tsuper.enable();\n\n\t\tfor ( const domElement of this._domElements ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdisable() {\n\t\tsuper.disable();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * Handles mutations. Deduplicates, mark view elements to sync, fire event and call render.\n\t *\n\t * @private\n\t * @param {Array.} domMutations Array of native mutations.\n\t */\n\t_onMutations( domMutations ) {\n\t\t// As a result of this.flush() we can have an empty collection.\n\t\tif ( domMutations.length === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domConverter = this.domConverter;\n\n\t\t// Use map and set for deduplication.\n\t\tconst mutatedTexts = new Map();\n\t\tconst mutatedElements = new Set();\n\n\t\t// Handle `childList` mutations first, so we will be able to check if the `characterData` mutation is in the\n\t\t// element with changed structure anyway.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tif ( mutation.type === 'childList' ) {\n\t\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t\t// Do not collect mutations from UIElements.\n\t\t\t\tif ( element && element.is( 'uiElement' ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif ( element && !this._isBogusBrMutation( mutation ) ) {\n\t\t\t\t\tmutatedElements.add( element );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Handle `characterData` mutations later, when we have the full list of nodes which changed structure.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t// Do not collect mutations from UIElements.\n\t\t\tif ( element && element.is( 'uiElement' ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tif ( mutation.type === 'characterData' ) {\n\t\t\t\tconst text = domConverter.findCorrespondingViewText( mutation.target );\n\n\t\t\t\tif ( text && !mutatedElements.has( text.parent ) ) {\n\t\t\t\t\t// Use text as a key, for deduplication. If there will be another mutation on the same text element\n\t\t\t\t\t// we will have only one in the map.\n\t\t\t\t\tmutatedTexts.set( text, {\n\t\t\t\t\t\ttype: 'text',\n\t\t\t\t\t\toldText: text.data,\n\t\t\t\t\t\tnewText: getDataWithoutFiller( mutation.target ),\n\t\t\t\t\t\tnode: text\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t\t// When we added first letter to the text node which had only inline filler, for the DOM it is mutation\n\t\t\t\t// on text, but for the view, where filler text node did not existed, new text node was created, so we\n\t\t\t\t// need to fire 'children' mutation instead of 'text'.\n\t\t\t\telse if ( !text && startsWithFiller( mutation.target ) ) {\n\t\t\t\t\tmutatedElements.add( domConverter.mapDomToView( mutation.target.parentNode ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Now we build the list of mutations to fire and mark elements. We did not do it earlier to avoid marking the\n\t\t// same node multiple times in case of duplication.\n\n\t\t// List of mutations we will fire.\n\t\tconst viewMutations = [];\n\n\t\tfor ( const mutatedText of mutatedTexts.values() ) {\n\t\t\tthis.renderer.markToSync( 'text', mutatedText.node );\n\t\t\tviewMutations.push( mutatedText );\n\t\t}\n\n\t\tfor ( const viewElement of mutatedElements ) {\n\t\t\tconst domElement = domConverter.mapViewToDom( viewElement );\n\t\t\tconst viewChildren = Array.from( viewElement.getChildren() );\n\t\t\tconst newViewChildren = Array.from( domConverter.domChildrenToView( domElement, { withChildren: false } ) );\n\n\t\t\t// It may happen that as a result of many changes (sth was inserted and then removed),\n\t\t\t// both elements haven't really changed. #1031\n\t\t\tif ( !isEqualWith( viewChildren, newViewChildren, sameNodes ) ) {\n\t\t\t\tthis.renderer.markToSync( 'children', viewElement );\n\n\t\t\t\tviewMutations.push( {\n\t\t\t\t\ttype: 'children',\n\t\t\t\t\toldChildren: viewChildren,\n\t\t\t\t\tnewChildren: newViewChildren,\n\t\t\t\t\tnode: viewElement\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\t// Retrieve `domSelection` using `ownerDocument` of one of mutated nodes.\n\t\t// There should not be simultaneous mutation in multiple documents, so it's fine.\n\t\tconst domSelection = domMutations[ 0 ].target.ownerDocument.getSelection();\n\n\t\tlet viewSelection = null;\n\n\t\tif ( domSelection && domSelection.anchorNode ) {\n\t\t\t// If `domSelection` is inside a dom node that is already bound to a view node from view tree, get\n\t\t\t// corresponding selection in the view and pass it together with `viewMutations`. The `viewSelection` may\n\t\t\t// be used by features handling mutations.\n\t\t\t// Only one range is supported.\n\n\t\t\tconst viewSelectionAnchor = domConverter.domPositionToView( domSelection.anchorNode, domSelection.anchorOffset );\n\t\t\tconst viewSelectionFocus = domConverter.domPositionToView( domSelection.focusNode, domSelection.focusOffset );\n\n\t\t\t// Anchor and focus has to be properly mapped to view.\n\t\t\tif ( viewSelectionAnchor && viewSelectionFocus ) {\n\t\t\t\tviewSelection = new ViewSelection( viewSelectionAnchor );\n\t\t\t\tviewSelection.setFocus( viewSelectionFocus );\n\t\t\t}\n\t\t}\n\n\t\tthis.document.fire( 'mutations', viewMutations, viewSelection );\n\n\t\t// If nothing changes on `mutations` event, at this point we have \"dirty DOM\" (changed) and de-synched\n\t\t// view (which has not been changed). In order to \"reset DOM\" we render the view again.\n\t\tthis.view.render();\n\n\t\tfunction sameNodes( child1, child2 ) {\n\t\t\t// First level of comparison (array of children vs array of children) – use the Lodash's default behavior.\n\t\t\tif ( Array.isArray( child1 ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Elements.\n\t\t\tif ( child1 === child2 ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t\t// Texts.\n\t\t\telse if ( child1.is( 'text' ) && child2.is( 'text' ) ) {\n\t\t\t\treturn child1.data === child2.data;\n\t\t\t}\n\n\t\t\t// Not matching types.\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Checks if mutation was generated by the browser inserting bogus br on the end of the block element.\n\t * Such mutations are generated while pressing space or performing native spellchecker correction\n\t * on the end of the block element in Firefox browser.\n\t *\n\t * @private\n\t * @param {Object} mutation Native mutation object.\n\t * @returns {Boolean}\n\t */\n\t_isBogusBrMutation( mutation ) {\n\t\tlet addedNode = null;\n\n\t\t// Check if mutation added only one node on the end of its parent.\n\t\tif ( mutation.nextSibling === null && mutation.removedNodes.length === 0 && mutation.addedNodes.length == 1 ) {\n\t\t\taddedNode = this.domConverter.domToView( mutation.addedNodes[ 0 ], {\n\t\t\t\twithChildren: false\n\t\t\t} );\n\t\t}\n\n\t\treturn addedNode && addedNode.is( 'element', 'br' );\n\t}\n}\n\n/**\n * Fired when mutation occurred. If tree view is not changed on this event, DOM will be reverted to the state before\n * mutation, so all changes which should be applied, should be handled on this event.\n *\n * Introduced by {@link module:engine/view/observer/mutationobserver~MutationObserver}.\n *\n * Note that because {@link module:engine/view/observer/mutationobserver~MutationObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @event module:engine/view/document~Document#event:mutations\n * @param {Array.}\n * viewMutations Array of mutations.\n * For mutated texts it will be {@link module:engine/view/observer/mutationobserver~MutatedText} and for mutated elements it will be\n * {@link module:engine/view/observer/mutationobserver~MutatedChildren}. You can recognize the type based on the `type` property.\n * @param {module:engine/view/selection~Selection|null} viewSelection View selection that is a result of converting DOM selection to view.\n * Keep in\n * mind that the DOM selection is already \"updated\", meaning that it already acknowledges changes done in mutation.\n */\n\n/**\n * Mutation item for text.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedText\n *\n * @property {String} type For text mutations it is always 'text'.\n * @property {module:engine/view/text~Text} node Mutated text node.\n * @property {String} oldText Old text.\n * @property {String} newText New text.\n */\n\n/**\n * Mutation item for child nodes.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedText\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @property {String} type For child nodes mutations it is always 'children'.\n * @property {module:engine/view/element~Element} node Parent of the mutated children.\n * @property {Array.} oldChildren Old child nodes.\n * @property {Array.} newChildren New child nodes.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/domeventdata\n */\n\nimport { extend } from 'lodash-es';\n\n/**\n * Information about a DOM event in context of the {@link module:engine/view/document~Document}.\n * It wraps the native event, which usually should not be used as the wrapper contains\n * additional data (like key code for keyboard events).\n */\nexport default class DomEventData {\n\t/**\n\t * @param {module:engine/view/view~View} view The instance of the view controller.\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] Additional properties that the instance should contain.\n\t */\n\tconstructor( view, domEvent, additionalData ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View} module:engine/view/observer/observer~Observer.DomEvent#view\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * The instance of the document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document} module:engine/view/observer/observer~Observer.DomEvent#document\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * The DOM event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Event} module:engine/view/observer/observer~Observer.DomEvent#domEvent\n\t\t */\n\t\tthis.domEvent = domEvent;\n\n\t\t/**\n\t\t * The DOM target.\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement} module:engine/view/observer/observer~Observer.DomEvent#target\n\t\t */\n\t\tthis.domTarget = domEvent.target;\n\n\t\textend( this, additionalData );\n\t}\n\n\t/**\n\t * The tree view element representing the target.\n\t *\n\t * @readonly\n\t * @type module:engine/view/element~Element\n\t */\n\tget target() {\n\t\treturn this.view.domConverter.mapDomToView( this.domTarget );\n\t}\n\n\t/**\n\t * Prevents the native's event default action.\n\t */\n\tpreventDefault() {\n\t\tthis.domEvent.preventDefault();\n\t}\n\n\t/**\n\t * Stops native event propagation.\n\t */\n\tstopPropagation() {\n\t\tthis.domEvent.stopPropagation();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/domeventobserver\n */\n\nimport Observer from './observer';\nimport DomEventData from './domeventdata';\n\n/**\n * Base class for DOM event observers. This class handles\n * {@link module:engine/view/observer/observer~Observer#observe adding} listeners to DOM elements,\n * {@link module:engine/view/observer/observer~Observer#disable disabling} and\n * {@link module:engine/view/observer/observer~Observer#enable re-enabling} events.\n * Child class needs to define\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#domEventType DOM event type} and\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#onDomEvent callback}.\n *\n * For instance:\n *\n *\t\tclass ClickObserver extends DomEventObserver {\n *\t\t\t// It can also be defined as a normal property in the constructor.\n *\t\t\tget domEventType() {\n *\t\t\t\treturn 'click';\n *\t\t\t}\n *\n *\t\t\tonDomEvent( domEvent ) {\n *\t\t\t\tthis.fire( 'click', domEvent );\n *\t\t\t}\n *\t\t}\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class DomEventObserver extends Observer {\n\t/**\n\t * Type of the DOM event the observer should listen on. Array of types can be defined\n\t * if the obsever should listen to multiple DOM events.\n\t *\n\t * @readonly\n\t * @member {String|Array.} #domEventType\n\t */\n\n\t/**\n\t * Callback which should be called when the DOM event occurred. Note that the callback will not be called if\n\t * observer {@link #isEnabled is not enabled}.\n\t *\n\t * @see #domEventType\n\t * @abstract\n\t * @method #onDomEvent\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * If set to `true` DOM events will be listened on the capturing phase.\n\t\t * Default value is `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.useCapture = false;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst types = typeof this.domEventType == 'string' ? [ this.domEventType ] : this.domEventType;\n\n\t\ttypes.forEach( type => {\n\t\t\tthis.listenTo( domElement, type, ( eventInfo, domEvent ) => {\n\t\t\t\tif ( this.isEnabled ) {\n\t\t\t\t\tthis.onDomEvent( domEvent );\n\t\t\t\t}\n\t\t\t}, { useCapture: this.useCapture } );\n\t\t} );\n\t}\n\n\t/**\n\t * Calls `Document#fire()` if observer {@link #isEnabled is enabled}.\n\t *\n\t * @see module:utils/emittermixin~EmitterMixin#fire\n\t * @param {String} eventType The event type (name).\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] The additional data which should extend the\n\t * {@link module:engine/view/observer/domeventdata~DomEventData event data} object.\n\t */\n\tfire( eventType, domEvent, additionalData ) {\n\t\tif ( this.isEnabled ) {\n\t\t\tthis.document.fire( eventType, new DomEventData( this.view, domEvent, additionalData ) );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/keyobserver\n */\n\nimport DomEventObserver from './domeventobserver';\nimport { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * {@link module:engine/view/document~Document#event:keydown Key down} event observer.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class KeyObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'keydown', 'keyup' ];\n\t}\n\n\tonDomEvent( domEvt ) {\n\t\tthis.fire( domEvt.type, domEvt, {\n\t\t\tkeyCode: domEvt.keyCode,\n\n\t\t\taltKey: domEvt.altKey,\n\t\t\tctrlKey: domEvt.ctrlKey || domEvt.metaKey,\n\t\t\tshiftKey: domEvt.shiftKey,\n\n\t\t\tget keystroke() {\n\t\t\t\treturn getCode( this );\n\t\t\t}\n\t\t} );\n\t}\n}\n\n/**\n * Fired when a key has been pressed.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keydown\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * Fired when a key has been released.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keyup\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * The value of both events - {@link module:engine/view/document~Document#event:keydown} and\n * {@link module:engine/view/document~Document#event:keyup}.\n *\n * @class module:engine/view/observer/keyobserver~KeyEventData\n * @extends module:engine/view/observer/domeventdata~DomEventData\n * @implements module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * Code of the whole keystroke. See {@link module:utils/keyboard~getCode}.\n *\n * @readonly\n * @member {Number} module:engine/view/observer/keyobserver~KeyEventData#keystroke\n */\n","import root from './_root.js';\n\n/**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n * console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\nvar now = function() {\n return root.Date.now();\n};\n\nexport default now;\n","import baseGetTag from './_baseGetTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar symbolTag = '[object Symbol]';\n\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\nfunction isSymbol(value) {\n return typeof value == 'symbol' ||\n (isObjectLike(value) && baseGetTag(value) == symbolTag);\n}\n\nexport default isSymbol;\n","import isObject from './isObject.js';\nimport isSymbol from './isSymbol.js';\n\n/** Used as references for various `Number` constants. */\nvar NAN = 0 / 0;\n\n/** Used to match leading and trailing whitespace. */\nvar reTrim = /^\\s+|\\s+$/g;\n\n/** Used to detect bad signed hexadecimal string values. */\nvar reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n/** Used to detect binary string values. */\nvar reIsBinary = /^0b[01]+$/i;\n\n/** Used to detect octal string values. */\nvar reIsOctal = /^0o[0-7]+$/i;\n\n/** Built-in method references without a dependency on `root`. */\nvar freeParseInt = parseInt;\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n if (typeof value == 'number') {\n return value;\n }\n if (isSymbol(value)) {\n return NAN;\n }\n if (isObject(value)) {\n var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n value = isObject(other) ? (other + '') : other;\n }\n if (typeof value != 'string') {\n return value === 0 ? value : +value;\n }\n value = value.replace(reTrim, '');\n var isBinary = reIsBinary.test(value);\n return (isBinary || reIsOctal.test(value))\n ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n : (reIsBadHex.test(value) ? NAN : +value);\n}\n\nexport default toNumber;\n","import isObject from './isObject.js';\nimport now from './now.js';\nimport toNumber from './toNumber.js';\n\n/** Error message constants. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n nativeMin = Math.min;\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n * Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n * The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n * Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n * 'leading': true,\n * 'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\nfunction debounce(func, wait, options) {\n var lastArgs,\n lastThis,\n maxWait,\n result,\n timerId,\n lastCallTime,\n lastInvokeTime = 0,\n leading = false,\n maxing = false,\n trailing = true;\n\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n wait = toNumber(wait) || 0;\n if (isObject(options)) {\n leading = !!options.leading;\n maxing = 'maxWait' in options;\n maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n trailing = 'trailing' in options ? !!options.trailing : trailing;\n }\n\n function invokeFunc(time) {\n var args = lastArgs,\n thisArg = lastThis;\n\n lastArgs = lastThis = undefined;\n lastInvokeTime = time;\n result = func.apply(thisArg, args);\n return result;\n }\n\n function leadingEdge(time) {\n // Reset any `maxWait` timer.\n lastInvokeTime = time;\n // Start the timer for the trailing edge.\n timerId = setTimeout(timerExpired, wait);\n // Invoke the leading edge.\n return leading ? invokeFunc(time) : result;\n }\n\n function remainingWait(time) {\n var timeSinceLastCall = time - lastCallTime,\n timeSinceLastInvoke = time - lastInvokeTime,\n timeWaiting = wait - timeSinceLastCall;\n\n return maxing\n ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)\n : timeWaiting;\n }\n\n function shouldInvoke(time) {\n var timeSinceLastCall = time - lastCallTime,\n timeSinceLastInvoke = time - lastInvokeTime;\n\n // Either this is the first call, activity has stopped and we're at the\n // trailing edge, the system time has gone backwards and we're treating\n // it as the trailing edge, or we've hit the `maxWait` limit.\n return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||\n (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));\n }\n\n function timerExpired() {\n var time = now();\n if (shouldInvoke(time)) {\n return trailingEdge(time);\n }\n // Restart the timer.\n timerId = setTimeout(timerExpired, remainingWait(time));\n }\n\n function trailingEdge(time) {\n timerId = undefined;\n\n // Only invoke if we have `lastArgs` which means `func` has been\n // debounced at least once.\n if (trailing && lastArgs) {\n return invokeFunc(time);\n }\n lastArgs = lastThis = undefined;\n return result;\n }\n\n function cancel() {\n if (timerId !== undefined) {\n clearTimeout(timerId);\n }\n lastInvokeTime = 0;\n lastArgs = lastCallTime = lastThis = timerId = undefined;\n }\n\n function flush() {\n return timerId === undefined ? result : trailingEdge(now());\n }\n\n function debounced() {\n var time = now(),\n isInvoking = shouldInvoke(time);\n\n lastArgs = arguments;\n lastThis = this;\n lastCallTime = time;\n\n if (isInvoking) {\n if (timerId === undefined) {\n return leadingEdge(lastCallTime);\n }\n if (maxing) {\n // Handle invocations in a tight loop.\n timerId = setTimeout(timerExpired, wait);\n return invokeFunc(lastCallTime);\n }\n }\n if (timerId === undefined) {\n timerId = setTimeout(timerExpired, wait);\n }\n return result;\n }\n debounced.cancel = cancel;\n debounced.flush = flush;\n return debounced;\n}\n\nexport default debounce;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/fakeselectionobserver\n */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport { debounce } from 'lodash-es';\n\n/**\n * Fake selection observer class. If view selection is fake it is placed in dummy DOM container. This observer listens\n * on {@link module:engine/view/document~Document#event:keydown keydown} events and handles moving fake view selection to the correct place\n * if arrow keys are pressed.\n * Fires {@link module:engine/view/document~Document#event:selectionChange selectionChange event} simulating natural behaviour of\n * {@link module:engine/view/observer/selectionobserver~SelectionObserver SelectionObserver}.\n *\n * @extends module:engine/view/observer/observer~Observer.Observer\n */\nexport default class FakeSelectionObserver extends Observer {\n\t/**\n\t * Creates new FakeSelectionObserver instance.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'keydown', ( eventInfo, data ) => {\n\t\t\tconst selection = document.selection;\n\n\t\t\tif ( selection.isFake && _isArrowKeyCode( data.keyCode ) && this.isEnabled ) {\n\t\t\t\t// Prevents default key down handling - no selection change will occur.\n\t\t\t\tdata.preventDefault();\n\n\t\t\t\tthis._handleSelectionMove( data.keyCode );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Handles collapsing view selection according to given key code. If left or up key is provided - new selection will be\n\t * collapsed to left. If right or down key is pressed - new selection will be collapsed to right.\n\t *\n\t * This method fires {@link module:engine/view/document~Document#event:selectionChange} and\n\t * {@link module:engine/view/document~Document#event:selectionChangeDone} events imitating behaviour of\n\t * {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n\t *\n\t * @private\n\t * @param {Number} keyCode\n\t * @fires module:engine/view/document~Document#event:selectionChange\n\t * @fires module:engine/view/document~Document#event:selectionChangeDone\n\t */\n\t_handleSelectionMove( keyCode ) {\n\t\tconst selection = this.document.selection;\n\t\tconst newSelection = new ViewSelection( selection.getRanges(), { backward: selection.isBackward, fake: false } );\n\n\t\t// Left or up arrow pressed - move selection to start.\n\t\tif ( keyCode == keyCodes.arrowleft || keyCode == keyCodes.arrowup ) {\n\t\t\tnewSelection.setTo( newSelection.getFirstPosition() );\n\t\t}\n\n\t\t// Right or down arrow pressed - move selection to end.\n\t\tif ( keyCode == keyCodes.arrowright || keyCode == keyCodes.arrowdown ) {\n\t\t\tnewSelection.setTo( newSelection.getLastPosition() );\n\t\t}\n\n\t\tconst data = {\n\t\t\toldSelection: selection,\n\t\t\tnewSelection,\n\t\t\tdomSelection: null\n\t\t};\n\n\t\t// Fire dummy selection change event.\n\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t}\n}\n\n// Checks if one of the arrow keys is pressed.\n//\n// @private\n// @param {Number} keyCode\n// @returns {Boolean}\nfunction _isArrowKeyCode( keyCode ) {\n\treturn keyCode == keyCodes.arrowright ||\n\t\tkeyCode == keyCodes.arrowleft ||\n\t\tkeyCode == keyCodes.arrowup ||\n\t\tkeyCode == keyCodes.arrowdown;\n}\n\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/selectionobserver\n */\n\n/* global setInterval, clearInterval */\n\nimport Observer from './observer';\nimport MutationObserver from './mutationobserver';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\nimport { debounce } from 'lodash-es';\n\n/**\n * Selection observer class observes selection changes in the document. If selection changes on the document this\n * observer checks if there are any mutations and if DOM selection is different than the\n * {@link module:engine/view/document~Document#selection view selection}. Selection observer fires\n * {@link module:engine/view/document~Document#event:selectionChange} event only if selection change was the only change in the document\n * and DOM selection is different then the view selection.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class SelectionObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Instance of the mutation observer. Selection observer calls\n\t\t * {@link module:engine/view/observer/mutationobserver~MutationObserver#flush} to ensure that the mutations will be handled\n\t\t * before the {@link module:engine/view/document~Document#event:selectionChange} event is fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/observer/mutationobserver~MutationObserver}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#mutationObserver\n\t\t */\n\t\tthis.mutationObserver = view.getObserver( MutationObserver );\n\n\t\t/**\n\t\t * Reference to the view {@link module:engine/view/documentselection~DocumentSelection} object used to compare\n\t\t * new selection with it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#selection\n\t\t */\n\t\tthis.selection = this.document.selection;\n\n\t\t/* eslint-disable max-len */\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter} module:engine/view/observer/selectionobserver~SelectionObserver#domConverter\n\t\t */\n\t\t/* eslint-enable max-len */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Set of documents which have added \"selectionchange\" listener to avoid adding listener twice to the same\n\t\t * document.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakSet.} module:engine/view/observer/selectionobserver~SelectionObserver#_documents\n\t\t */\n\t\tthis._documents = new WeakSet();\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\n\t\tthis._clearInfiniteLoopInterval = setInterval( () => this._clearInfiniteLoop(), 1000 );\n\n\t\t/**\n\t\t * Private property to check if the code does not enter infinite loop.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} module:engine/view/observer/selectionobserver~SelectionObserver#_loopbackCounter\n\t\t */\n\t\tthis._loopbackCounter = 0;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst domDocument = domElement.ownerDocument;\n\n\t\t// Add listener once per each document.\n\t\tif ( this._documents.has( domDocument ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.listenTo( domDocument, 'selectionchange', () => {\n\t\t\tthis._handleSelectionChange( domDocument );\n\t\t} );\n\n\t\tthis._documents.add( domDocument );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tclearInterval( this._clearInfiniteLoopInterval );\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Selection change listener. {@link module:engine/view/observer/mutationobserver~MutationObserver#flush Flush} mutations, check if\n\t * selection changes and fires {@link module:engine/view/document~Document#event:selectionChange} event on every change\n\t * and {@link module:engine/view/document~Document#event:selectionChangeDone} when selection stop changing.\n\t *\n\t * @private\n\t * @param {Document} domDocument DOM document.\n\t */\n\t_handleSelectionChange( domDocument ) {\n\t\t// Selection is handled when document is not focused but is read-only. This is because in read-only\n\t\t// mode contenteditable is set as false and editor won't receive focus but we still need to know\n\t\t// selection position.\n\t\tif ( !this.isEnabled || ( !this.document.isFocused && !this.document.isReadOnly ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure the mutation event will be before selection event on all browsers.\n\t\tthis.mutationObserver.flush();\n\n\t\t// If there were mutations then the view will be re-rendered by the mutation observer and selection\n\t\t// will be updated, so selections will equal and event will not be fired, as expected.\n\t\tconst domSelection = domDocument.defaultView.getSelection();\n\t\tconst newViewSelection = this.domConverter.domSelectionToView( domSelection );\n\n\t\tif ( this.selection.isEqual( newViewSelection ) && this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure we are not in the infinite loop (#400).\n\t\t// This counter is reset each second. 60 selection changes in 1 second is enough high number\n\t\t// to be very difficult (impossible) to achieve using just keyboard keys (during normal editor use).\n\t\tif ( ++this._loopbackCounter > 60 ) {\n\t\t\t/**\n\t\t\t * Selection change observer detected an infinite rendering loop.\n\t\t\t * Most probably you try to put the selection in the position which is not allowed\n\t\t\t * by the browser and browser fixes it automatically what causes `selectionchange` event on\n\t\t\t * which a loopback through a model tries to re-render the wrong selection and again.\n\t\t\t *\n\t\t\t * @error selectionchange-infinite-loop\n\t\t\t */\n\t\t\tlog.warn( 'selectionchange-infinite-loop: Selection change observer detected an infinite rendering loop.' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this.selection.isSimilar( newViewSelection ) ) {\n\t\t\t// If selection was equal and we are at this point of algorithm, it means that it was incorrect.\n\t\t\t// Just re-render it, no need to fire any events, etc.\n\t\t\tthis.view.render();\n\t\t} else {\n\t\t\tconst data = {\n\t\t\t\toldSelection: this.selection,\n\t\t\t\tnewSelection: newViewSelection,\n\t\t\t\tdomSelection\n\t\t\t};\n\n\t\t\t// Prepare data for new selection and fire appropriate events.\n\t\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t\t}\n\t}\n\n\t/**\n\t * Clears `SelectionObserver` internal properties connected with preventing infinite loop.\n\t *\n\t * @protected\n\t */\n\t_clearInfiniteLoop() {\n\t\tthis._loopbackCounter = 0;\n\t}\n}\n\n/**\n * Fired when selection has changed. This event is fired only when the selection change was the only change that happened\n * in the document, and old selection is different then the new selection.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChange\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n\n/**\n * Fired when selection stops changing.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChangeDone\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/focusobserver\n */\n\n/* globals setTimeout, clearTimeout */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:focus Focus}\n * and {@link module:engine/view/document~Document#event:blur blur} events observer.\n * Focus observer handle also {@link module:engine/view/rooteditableelement~RootEditableElement#isFocused isFocused} property of the\n * {@link module:engine/view/rooteditableelement~RootEditableElement root elements}.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class FocusObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'focus', 'blur' ];\n\t\tthis.useCapture = true;\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'focus', () => {\n\t\t\tdocument.isFocused = true;\n\n\t\t\t// Unfortunately native `selectionchange` event is fired asynchronously.\n\t\t\t// We need to wait until `SelectionObserver` handle the event and then render. Otherwise rendering will\n\t\t\t// overwrite new DOM selection with selection from the view.\n\t\t\t// See https://github.com/ckeditor/ckeditor5-engine/issues/795 for more details.\n\t\t\t// Long timeout is needed to solve #676 and https://github.com/ckeditor/ckeditor5-engine/issues/1157 issues.\n\t\t\tthis._renderTimeoutId = setTimeout( () => view.render(), 50 );\n\t\t} );\n\n\t\tdocument.on( 'blur', ( evt, data ) => {\n\t\t\tconst selectedEditable = document.selection.editableElement;\n\n\t\t\tif ( selectedEditable === null || selectedEditable === data.target ) {\n\t\t\t\tdocument.isFocused = false;\n\n\t\t\t\t// Re-render the document to update view elements.\n\t\t\t\tview.render();\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * Identifier of the timeout currently used by focus listener to delay rendering execution.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} #_renderTimeoutId\n\t\t */\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tif ( this._renderTimeoutId ) {\n\t\t\tclearTimeout( this._renderTimeoutId );\n\t\t}\n\n\t\tsuper.destroy();\n\t}\n}\n\n/**\n * Fired when one of the editables gets focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:focus\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when one of the editables loses focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:blur\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/compositionobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:compositionstart Compositionstart},\n * {@link module:engine/view/document~Document#event:compositionupdate compositionupdate} and\n * {@link module:engine/view/document~Document#event:compositionend compositionend} events observer.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class CompositionObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'compositionstart', 'compositionupdate', 'compositionend' ];\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'compositionstart', () => {\n\t\t\tdocument.isComposing = true;\n\t\t} );\n\n\t\tdocument.on( 'compositionend', () => {\n\t\t\tdocument.isComposing = false;\n\t\t} );\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired when composition starts inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionstart\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition is updated inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionupdate\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition ends inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionend\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/isrange\n */\n\n/**\n * Checks if the object is a native DOM Range.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isRange( obj ) {\n\treturn Object.prototype.toString.apply( obj ) == '[object Range]';\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/getborderwidths\n */\n\n/**\n * Returns an object containing CSS border widths of a specified HTML element.\n *\n * @param {HTMLElement} element An element which has CSS borders.\n * @returns {Object} An object containing `top`, `left`, `right` and `bottom` properties\n * with numerical values of the `border-[top,left,right,bottom]-width` CSS styles.\n */\nexport default function getBorderWidths( element ) {\n\t// Call getComputedStyle on the window the element document belongs to.\n\tconst style = element.ownerDocument.defaultView.getComputedStyle( element );\n\n\treturn {\n\t\ttop: parseInt( style.borderTopWidth, 10 ),\n\t\tright: parseInt( style.borderRightWidth, 10 ),\n\t\tbottom: parseInt( style.borderBottomWidth, 10 ),\n\t\tleft: parseInt( style.borderLeftWidth, 10 )\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/rect\n */\n\nimport isRange from './isrange';\nimport isWindow from './iswindow';\nimport getBorderWidths from './getborderwidths';\nimport log from '../log';\nimport isText from './istext';\nimport { isElement } from 'lodash-es';\n\nconst rectProperties = [ 'top', 'right', 'bottom', 'left', 'width', 'height' ];\n\n/**\n * A helper class representing a `ClientRect` object, e.g. value returned by\n * the native `object.getBoundingClientRect()` method. Provides a set of methods\n * to manipulate the rect and compare it against other rect instances.\n */\nexport default class Rect {\n\t/**\n\t * Creates an instance of rect.\n\t *\n\t *\t\t// Rect of an HTMLElement.\n\t *\t\tconst rectA = new Rect( document.body );\n\t *\n\t *\t\t// Rect of a DOM Range.\n\t *\t\tconst rectB = new Rect( document.getSelection().getRangeAt( 0 ) );\n\t *\n\t *\t\t// Rect of a window (web browser viewport).\n\t *\t\tconst rectC = new Rect( window );\n\t *\n\t *\t\t// Rect out of an object.\n\t *\t\tconst rectD = new Rect( { top: 0, right: 10, bottom: 10, left: 0, width: 10, height: 10 } );\n\t *\n\t *\t\t// Rect out of another Rect instance.\n\t *\t\tconst rectE = new Rect( rectD );\n\t *\n\t *\t\t// Rect out of a ClientRect.\n\t *\t\tconst rectF = new Rect( document.body.getClientRects().item( 0 ) );\n\t *\n\t * **Note**: By default a rect of an HTML element includes its CSS borders and scrollbars (if any)\n\t * ant the rect of a `window` includes scrollbars too. Use {@link #excludeScrollbarsAndBorders}\n\t * to get the inner part of the rect.\n\t *\n\t * @param {HTMLElement|Range|Window|ClientRect|module:utils/dom/rect~Rect|Object} source A source object to create the rect.\n\t */\n\tconstructor( source ) {\n\t\tconst isSourceRange = isRange( source );\n\n\t\t/**\n\t\t * The object this rect is for.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {HTMLElement|Range|ClientRect|module:utils/dom/rect~Rect|Object} #_source\n\t\t */\n\t\tObject.defineProperty( this, '_source', {\n\t\t\t// If the source is a Rect instance, copy it's #_source.\n\t\t\tvalue: source._source || source,\n\t\t\twritable: true,\n\t\t\tenumerable: false\n\t\t} );\n\n\t\tif ( isElement( source ) || isSourceRange ) {\n\t\t\tconst sourceNode = isSourceRange ? source.startContainer : source;\n\n\t\t\tif ( !sourceNode.ownerDocument || !sourceNode.ownerDocument.body.contains( sourceNode ) ) {\n\t\t\t\t/**\n\t\t\t\t * The `Rect` class depends on `getBoundingClientRect` and `getClientRects` DOM methods.\n\t\t\t\t * If the {@link #constructor source} of a rect in an HTML element or a DOM range but it does\n\t\t\t\t * not belong to any rendered DOM tree, these methods will fail to obtain the geometry and\n\t\t\t\t * the rect instance makes little sense to the features using it.\n\t\t\t\t *\n\t\t\t\t * To get rid of this warning make sure the source passed to the constructor\n\t\t\t\t * is a descendant of `window.document.body`.\n\t\t\t\t *\n\t\t\t\t * @error rect-source-not-in-dom\n\t\t\t\t * @param {String} source The source of the Rect instance.\n\t\t\t\t */\n\t\t\t\tlog.warn(\n\t\t\t\t\t'rect-source-not-in-dom: The source of this rect does not belong to any rendered DOM tree.',\n\t\t\t\t\t{ source }\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tif ( isSourceRange ) {\n\t\t\t\tcopyRectProperties( this, Rect.getDomRangeRects( source )[ 0 ] );\n\t\t\t} else {\n\t\t\t\tcopyRectProperties( this, source.getBoundingClientRect() );\n\t\t\t}\n\t\t} else if ( isWindow( source ) ) {\n\t\t\tconst { innerWidth, innerHeight } = source;\n\n\t\t\tcopyRectProperties( this, {\n\t\t\t\ttop: 0,\n\t\t\t\tright: innerWidth,\n\t\t\t\tbottom: innerHeight,\n\t\t\t\tleft: 0,\n\t\t\t\twidth: innerWidth,\n\t\t\t\theight: innerHeight\n\t\t\t} );\n\t\t} else {\n\t\t\tcopyRectProperties( this, source );\n\t\t}\n\n\t\t/**\n\t\t * The \"top\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #top\n\t\t */\n\n\t\t/**\n\t\t * The \"right\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #right\n\t\t */\n\n\t\t/**\n\t\t * The \"bottom\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #bottom\n\t\t */\n\n\t\t/**\n\t\t * The \"left\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #left\n\t\t */\n\n\t\t/**\n\t\t * The \"width\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #width\n\t\t */\n\n\t\t/**\n\t\t * The \"height\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #height\n\t\t */\n\t}\n\n\t/**\n\t * Returns a clone of the rect.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A cloned rect.\n\t */\n\tclone() {\n\t\treturn new Rect( this );\n\t}\n\n\t/**\n\t * Moves the rect so that its upper–left corner lands in desired `[ x, y ]` location.\n\t *\n\t * @param {Number} x Desired horizontal location.\n\t * @param {Number} y Desired vertical location.\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveTo( x, y ) {\n\t\tthis.top = y;\n\t\tthis.right = x + this.width;\n\t\tthis.bottom = y + this.height;\n\t\tthis.left = x;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves the rect in–place by a dedicated offset.\n\t *\n\t * @param {Number} x A horizontal offset.\n\t * @param {Number} y A vertical offset\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveBy( x, y ) {\n\t\tthis.top += y;\n\t\tthis.right += x;\n\t\tthis.left += x;\n\t\tthis.bottom += y;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns a new rect a a result of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {module:utils/dom/rect~Rect}\n\t */\n\tgetIntersection( anotherRect ) {\n\t\tconst rect = {\n\t\t\ttop: Math.max( this.top, anotherRect.top ),\n\t\t\tright: Math.min( this.right, anotherRect.right ),\n\t\t\tbottom: Math.min( this.bottom, anotherRect.bottom ),\n\t\t\tleft: Math.max( this.left, anotherRect.left )\n\t\t};\n\n\t\trect.width = rect.right - rect.left;\n\t\trect.height = rect.bottom - rect.top;\n\n\t\tif ( rect.width < 0 || rect.height < 0 ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\treturn new Rect( rect );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect [description]\n\t * @returns {Number} Area of intersection.\n\t */\n\tgetIntersectionArea( anotherRect ) {\n\t\tconst rect = this.getIntersection( anotherRect );\n\n\t\tif ( rect ) {\n\t\t\treturn rect.getArea();\n\t\t} else {\n\t\t\treturn 0;\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of the rect.\n\t *\n\t * @returns {Number}\n\t */\n\tgetArea() {\n\t\treturn this.width * this.height;\n\t}\n\n\t/**\n\t * Returns a new rect, a part of the original rect, which is actually visible to the user,\n\t * e.g. an original rect cropped by parent element rects which have `overflow` set in CSS\n\t * other than `\"visible\"`.\n\t *\n\t * If there's no such visible rect, which is when the rect is limited by one or many of\n\t * the ancestors, `null` is returned.\n\t *\n\t * @returns {module:utils/dom/rect~Rect|null} A visible rect instance or `null`, if there's none.\n\t */\n\tgetVisible() {\n\t\tconst source = this._source;\n\t\tlet visibleRect = this.clone();\n\n\t\t// There's no ancestor to crop with the overflow.\n\t\tif ( !isBody( source ) ) {\n\t\t\tlet parent = source.parentNode || source.commonAncestorContainer;\n\n\t\t\t// Check the ancestors all the way up to the .\n\t\t\twhile ( parent && !isBody( parent ) ) {\n\t\t\t\tconst parentRect = new Rect( parent );\n\t\t\t\tconst intersectionRect = visibleRect.getIntersection( parentRect );\n\n\t\t\t\tif ( intersectionRect ) {\n\t\t\t\t\tif ( intersectionRect.getArea() < visibleRect.getArea() ) {\n\t\t\t\t\t\t// Reduce the visible rect to the intersection.\n\t\t\t\t\t\tvisibleRect = intersectionRect;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\t// There's no intersection, the rect is completely invisible.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tparent = parent.parentNode;\n\t\t\t}\n\t\t}\n\n\t\treturn visibleRect;\n\t}\n\n\t/**\n\t * Checks if all property values ({@link #top}, {@link #left}, {@link #right},\n\t * {@link #bottom}, {@link #width} and {@link #height}) are the equal in both rect\n\t * instances.\n\t *\n\t * @param {module:utils/dom/rect~Rect} rect A rect instance to compare with.\n\t * @returns {Boolean} `true` when Rects are equal. `false` otherwise.\n\t */\n\tisEqual( anotherRect ) {\n\t\tfor ( const prop of rectProperties ) {\n\t\t\tif ( this[ prop ] !== anotherRect[ prop ] ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether a rect fully contains another rect instance.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {Boolean} `true` if contains, `false` otherwise.\n\t */\n\tcontains( anotherRect ) {\n\t\tconst intersectRect = this.getIntersection( anotherRect );\n\n\t\treturn !!( intersectRect && intersectRect.isEqual( anotherRect ) );\n\t}\n\n\t/**\n\t * Excludes scrollbars and CSS borders from the rect.\n\t *\n\t * * Borders are removed when {@link #_source} is an HTML element.\n\t * * Scrollbars are excluded from HTML elements and the `window`.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been updated.\n\t */\n\texcludeScrollbarsAndBorders() {\n\t\tconst source = this._source;\n\t\tlet scrollBarWidth, scrollBarHeight;\n\n\t\tif ( isWindow( source ) ) {\n\t\t\tscrollBarWidth = source.innerWidth - source.document.documentElement.clientWidth;\n\t\t\tscrollBarHeight = source.innerHeight - source.document.documentElement.clientHeight;\n\t\t} else {\n\t\t\tconst borderWidths = getBorderWidths( this._source );\n\n\t\t\tscrollBarWidth = source.offsetWidth - source.clientWidth;\n\t\t\tscrollBarHeight = source.offsetHeight - source.clientHeight;\n\n\t\t\tthis.moveBy( borderWidths.left, borderWidths.top );\n\t\t}\n\n\t\t// Assuming LTR scrollbars. TODO: RTL.\n\t\tthis.width -= scrollBarWidth;\n\t\tthis.right -= scrollBarWidth;\n\n\t\tthis.height -= scrollBarHeight;\n\t\tthis.bottom -= scrollBarHeight;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of rects of the given native DOM Range.\n\t *\n\t * @param {Range} range A native DOM range.\n\t * @returns {Array.} DOM Range rects.\n\t */\n\tstatic getDomRangeRects( range ) {\n\t\tconst rects = [];\n\t\t// Safari does not iterate over ClientRectList using for...of loop.\n\t\tconst clientRects = Array.from( range.getClientRects() );\n\n\t\tif ( clientRects.length ) {\n\t\t\tfor ( const rect of clientRects ) {\n\t\t\t\trects.push( new Rect( rect ) );\n\t\t\t}\n\t\t}\n\t\t// If there's no client rects for the Range, use parent container's bounding rect\n\t\t// instead and adjust rect's width to simulate the actual geometry of such range.\n\t\t// https://github.com/ckeditor/ckeditor5-utils/issues/153\n\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/317\n\t\telse {\n\t\t\tlet startContainer = range.startContainer;\n\n\t\t\tif ( isText( startContainer ) ) {\n\t\t\t\tstartContainer = startContainer.parentNode;\n\t\t\t}\n\n\t\t\tconst rect = new Rect( startContainer.getBoundingClientRect() );\n\t\t\trect.right = rect.left;\n\t\t\trect.width = 0;\n\n\t\t\trects.push( rect );\n\t\t}\n\n\t\treturn rects;\n\t}\n}\n\n// Acquires all the rect properties from the passed source.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} rect\n// @param {ClientRect|module:utils/dom/rect~Rect|Object} source\nfunction copyRectProperties( rect, source ) {\n\tfor ( const p of rectProperties ) {\n\t\trect[ p ] = source[ p ];\n\t}\n}\n\n// Checks if provided object is a HTML element.\n//\n// @private\n// @param {HTMLElement|Range} elementOrRange\n// @returns {Boolean}\nfunction isBody( elementOrRange ) {\n\tif ( !isElement( elementOrRange ) ) {\n\t\treturn false;\n\t}\n\n\treturn elementOrRange === elementOrRange.ownerDocument.body;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/scroll\n */\n\nimport isRange from './isrange';\nimport Rect from './rect';\nimport isText from './istext';\n\nconst utils = {};\n\n/**\n * Makes any page `HTMLElement` or `Range` (`target`) visible inside the browser viewport.\n * This helper will scroll all `target` ancestors and the web browser viewport to reveal the target to\n * the user. If the `target` is already visible, nothing will happen.\n *\n * @param {HTMLElement|Range} options.target A target, which supposed to become visible to the user.\n * @param {Number} [options.viewportOffset] An offset from the edge of the viewport (in pixels)\n * the `target` will be moved by when the viewport is scrolled. It enhances the user experience\n * by keeping the `target` some distance from the edge of the viewport and thus making it easier to\n * read or edit by the user.\n */\nexport function scrollViewportToShowTarget( { target, viewportOffset = 0 } ) {\n\tconst targetWindow = getWindow( target );\n\tlet currentWindow = targetWindow;\n\tlet currentFrame = null;\n\n\t// Iterate over all windows, starting from target's parent window up to window#top.\n\twhile ( currentWindow ) {\n\t\tlet firstAncestorToScroll;\n\n\t\t// Let's scroll target's ancestors first to reveal it. Then, once the ancestor scrolls\n\t\t// settled down, the algorithm can eventually scroll the viewport of the current window.\n\t\t//\n\t\t// Note: If the current window is target's **original** window (e.g. the first one),\n\t\t// start scrolling the closest parent of the target. If not, scroll the closest parent\n\t\t// of an iframe that resides in the current window.\n\t\tif ( currentWindow == targetWindow ) {\n\t\t\tfirstAncestorToScroll = getParentElement( target );\n\t\t} else {\n\t\t\tfirstAncestorToScroll = getParentElement( currentFrame );\n\t\t}\n\n\t\t// Scroll the target's ancestors first. Once done, scrolling the viewport is easy.\n\t\tscrollAncestorsToShowRect( firstAncestorToScroll, () => {\n\t\t\t// Note: If the target does not belong to the current window **directly**,\n\t\t\t// i.e. it resides in an iframe belonging to the window, obtain the target's rect\n\t\t\t// in the coordinates of the current window. By default, a Rect returns geometry\n\t\t\t// relative to the current window's viewport. To make it work in a parent window,\n\t\t\t// it must be shifted.\n\t\t\treturn getRectRelativeToWindow( target, currentWindow );\n\t\t} );\n\n\t\t// Obtain the rect of the target after it has been scrolled within its ancestors.\n\t\t// It's time to scroll the viewport.\n\t\tconst targetRect = getRectRelativeToWindow( target, currentWindow );\n\n\t\tscrollWindowToShowRect( currentWindow, targetRect, viewportOffset );\n\n\t\tif ( currentWindow.parent != currentWindow ) {\n\t\t\t// Keep the reference to the