From e5e78962f0bd9208fdd52da2f177acae117885ec Mon Sep 17 00:00:00 2001
From: Sauli Anto <sauli.anto@gmail.com>
Date: Tue, 1 Oct 2019 17:46:51 +0300
Subject: [PATCH] Remove math paste from office

---
 src/math.js                |   3 +-
 src/mathpastefromoffice.js | 263 -------------------------------------
 src/utils.js               |   2 +-
 3 files changed, 2 insertions(+), 266 deletions(-)
 delete mode 100644 src/mathpastefromoffice.js

diff --git a/src/math.js b/src/math.js
index a828653c5..73f753082 100644
--- a/src/math.js
+++ b/src/math.js
@@ -4,11 +4,10 @@ import Widget from '@ckeditor/ckeditor5-widget/src/widget';
 import MathUI from './mathui';
 import MathEditing from './mathediting';
 import AutoMath from './automath';
-import MathPasteFromOffice from './mathpastefromoffice';
 
 export default class Math extends Plugin {
 	static get requires() {
-		return [ MathEditing, MathUI, Widget, AutoMath, MathPasteFromOffice ];
+		return [ MathEditing, MathUI, Widget, AutoMath ];
 	}
 
 	static get pluginName() {
diff --git a/src/mathpastefromoffice.js b/src/mathpastefromoffice.js
deleted file mode 100644
index f7bc792fd..000000000
--- a/src/mathpastefromoffice.js
+++ /dev/null
@@ -1,263 +0,0 @@
-import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
-import Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';
-import UpcastWriter from '@ckeditor/ckeditor5-engine/src/view/upcastwriter';
-import Matcher from '@ckeditor/ckeditor5-engine/src/view/matcher';
-// import Element from '@ckeditor/ckeditor5-engine/src/view/element';
-import { normalizeSpacing, normalizeSpacerunSpans } from '@ckeditor/ckeditor5-paste-from-office/src/filters/space';
-
-const BULLET_REGEXP = /(<span style=['"]mso-list:((.||\r?\n)*?)Ignore['"]>((.|\r?\n)*?)<\/span>)/g;
-
-export default class MathPasteFromOffice extends Plugin {
-	static get pluginName() {
-		return 'MathPasteFromOffice';
-	}
-
-	static get requires() {
-		return [ Clipboard ];
-	}
-
-	init() {
-		const editor = this.editor;
-
-		editor.plugins.get( 'Clipboard' ).on(
-			'inputTransformation',
-			( evt, data ) => {
-				console.log( 'isTransformedWithPasteFromOffice', data.isTransformedWithPasteFromOffice ); // eslint-disable-line
-				console.log( data.content ); // eslint-disable-line
-
-				if ( data.isTransformedWithMathPasteFromOffice ) {
-					return;
-				}
-
-				if ( !data.isTransformedWithPasteFromOffice ) {
-					console.warn( 'Paste from office must be set before this' );// eslint-disable-line
-					return;
-				}
-
-				const domParser = new DOMParser(); // eslint-disable-line
-
-				/*
-				console.log(htmlString); // eslint-disable-line
-				const { body } = parseHtml( htmlString );
-				console.log(body); // eslint-disable-line
-				*/
-
-				const plainString = data.dataTransfer.getData( 'text/plain' );
-				const lines = plainString.split( /\r?\n/ ); // split by new lines
-				if ( lines.length > 1 ) {
-					lines.pop(); // Remove last new line
-				}
-				// console.log(plainString); // eslint-disable-line
-
-				const htmlMimeType = 'text/html';
-				let htmlString = data.dataTransfer.getData( htmlMimeType );
-				// console.log(htmlString); // eslint-disable-line
-
-				htmlString = htmlString.replace( /<!--\[if gte vml 1]>/g, '' );
-				htmlString = htmlString.replace( BULLET_REGEXP, '' );
-
-				const normalizedHtml = normalizeSpacing( cleanContentAfterBody( htmlString ) );
-				const htmlDocument = domParser.parseFromString( normalizedHtml, htmlMimeType );
-				normalizeSpacerunSpans( htmlDocument );
-
-				// const htmlDocument = domParser.parseFromString( htmlString, htmlMimeType );
-				// console.log(htmlDocument); // eslint-disable-line
-
-				const parts = htmlDocument.body.children;
-
-				// console.log(parts); // eslint-disable-line
-
-				const partsByLines = [];
-
-				for ( let i = 0; i < parts.length; i++ ) {
-					const part = parts[ i ];
-					if ( part.tagName.toLowerCase() === 'table' ) {
-						// console.log(part); // eslint-disable-line
-						const table = part;
-						const rows = table.getElementsByTagName( 'tr' );
-						for ( let j = 0; j < rows.length; j++ ) {
-							const row = rows[ j ];
-							partsByLines.push( row );
-						}
-						// console.log(rows); // eslint-disable-line
-					} else {
-						partsByLines.push( part );
-					}
-				}
-
-				// console.log(lines); // eslint-disable-line
-				// console.log(parts); // eslint-disable-line
-				// console.log(lines.length, partsByLines.length); // eslint-disable-line
-
-				if ( lines.length === partsByLines.length ) {
-					for ( let i = 0; i < partsByLines.length; i++ ) {
-						const part = partsByLines[ i ];
-						const line = lines[ i ];
-
-						const nodes = part.childNodes;
-						// console.log( nodes ); // eslint-disable-line
-
-						let lineFromNode = '';
-						let equationCounter = 0;
-						for ( let j = 0; j < nodes.length; j++ ) {
-							const node = nodes[ j ];
-							// If node is comment
-							const commentType = Node.COMMENT_NODE; // eslint-disable-line
-							if ( node.nodeType === commentType ) {
-								const commentNode = node;
-								// console.log( comment ); // eslint-disable-line
-								const comment = commentNode.textContent;
-								// console.log(comment); // eslint-disable-line
-								if ( comment.match( /\[if gte msEquation 12]>/g ) ) {
-									equationCounter++;
-								}
-							}
-							if ( node.nodeType === Node.ELEMENT_NODE || node.nodeType === Node.TEXT_NODE ) { // eslint-disable-line
-								// console.log( node.nodeType, node.textContent ); // eslint-disable-line
-								lineFromNode += node.textContent;
-							}
-						}
-
-						// Skip if don't have any equation
-						if ( equationCounter === 0 ) {
-							continue;
-						}
-
-						const equations = collectEquations( line, lineFromNode, equationCounter );
-						// console.log( part, equations ); // eslint-disable-line
-
-						const images = part.getElementsByTagName( 'img' );
-						// console.log( images ); // eslint-disable-line
-						for ( let j = 0; j < images.length; j++ ) {
-							const img = images[ j ];
-							// console.log( img.src ); // eslint-disable-line
-
-							const mathtex = document.createElement( 'span' ); // eslint-disable-line
-							mathtex.classList.add( 'math-tex' );
-							mathtex.innerHTML = '\\[' + equations[ j ] + '\\]';
-
-							const parent = img.parentNode;
-							parent.replaceChild( mathtex, img );
-
-							// console.log( parent ); // eslint-disable-line
-						}
-					}
-
-					const writer = new UpcastWriter();
-					const documentFragment = data.content;
-					const itemLikeElements = findAllItemLikeElements( documentFragment, writer );
-					console.log( itemLikeElements ); // eslint-disable-line
-
-					if ( !itemLikeElements.length ) {
-						return;
-					}
-
-					itemLikeElements.forEach( ( itemLikeElement, i ) => {
-						console.log( i, itemLikeElement, itemLikeElement.element ); // eslint-disable-line
-						// const item = new Element( 'span' );
-					} );
-				} else {
-					console.warn( 'Lines length is wrong',  lines.length + ' !== ' + partsByLines.length ); // eslint-disable-line
-				}
-
-				data.isTransformedWithMathPasteFromOffice = true;
-			},
-			{ priority: 'high' }
-		);
-	}
-}
-
-function collectEquations( line, lineFromNode, equationCounter ) {
-	const equations = [];
-	let equation = '';
-	let charCounter = 0;
-	let newEquation = true;
-
-	// Replace all spaces to non breaking spaces. (Cannot be in equation)
-	let lineFiltered = line;
-	lineFiltered = lineFiltered.replace( /&nbsp;/g, ' ' );
-	lineFiltered = lineFiltered.trim();
-
-	// Remove '\ ' chars
-	lineFiltered = lineFiltered.replace( /\\ /g, '' ); // Remove all extra spaces.
-
-	// Try remove all spaces in equation
-	lineFiltered = lineFiltered.replace( /{(?=.*?)(?=\\+).*?}/g, match => {
-		return match.replace( /\s+/g, '' );
-	} ); // Remove all extra spaces.
-	lineFiltered = lineFiltered.replace( /\s/g, '\u00A0' ); // Replcae all spaces to non breaking spaces
-
-	let lineFromNodeFiltered = lineFromNode;
-	lineFromNodeFiltered = lineFromNodeFiltered.replace( /\r?\n|\r/g, ' ' ); // Line break is same as space
-	lineFromNodeFiltered = lineFromNodeFiltered.replace( /&nbsp;/g, ' ' );
-	lineFromNodeFiltered = lineFromNodeFiltered.trim();
-	lineFromNodeFiltered = lineFromNodeFiltered.replace( /\s/g, '\u00A0' ); // Replcae all spaces to non breaking spaces
-
-	// eslint-disable-next-line
-	// console.log( '%c' + lineFiltered + ' %c' + lineFromNodeFiltered + ' %c', 'color:green', 'color:red','color:white' );
-
-	// Let check line char by char
-	for ( let j = 0; j < lineFiltered.length; j++ ) {
-		const charFromLine = lineFiltered.charAt( j );
-		// console.log( charFromLine, lineFiltered.charCodeAt( j ) ); // eslint-disable-line
-		const charFromNode = lineFromNodeFiltered.charAt( j - charCounter );
-		// Jump to next iteration if same char
-		// console.log( charFromLine, charFromNode ); // eslint-disable-line
-		if ( charFromLine === charFromNode ) {
-			if ( !newEquation ) {
-				equations.push( equation.trim() );
-				equation = '';
-				newEquation = true;
-			}
-			continue;
-		} else {
-			equation += charFromLine;
-			charCounter++;
-			if ( newEquation ) {
-				newEquation = false;
-			}
-		}
-	}
-	// Add last one
-	if ( !newEquation ) {
-		equations.push( equation.trim() );
-		equation = '';
-		newEquation = true;
-	}
-
-	if ( equations.length !== equationCounter ) {
-		console.warn( 'Couldn\'t parse all equations' ); // eslint-disable-line
-	}
-
-	return equations;
-}
-
-function cleanContentAfterBody( htmlString ) {
-	const regexp = /<\/body>(.*?)(<\/html>|$)/;
-	const match = htmlString.match( regexp );
-
-	if ( match && match[ 1 ] ) {
-		htmlString = htmlString.slice( 0, match.index ) + htmlString.slice( match.index ).replace( match[ 1 ], '' );
-	}
-
-	return htmlString;
-}
-
-function findAllItemLikeElements( documentFragment, writer ) {
-	const range = writer.createRangeIn( documentFragment );
-
-	// Matcher for finding list-like elements.
-	const itemLikeElementsMatcher = new Matcher( {
-		name: /^img$/
-	} );
-
-	const itemLikeElements = [];
-
-	for ( const value of range ) {
-		if ( value.type === 'elementStart' && itemLikeElementsMatcher.match( value.item ) ) {
-			itemLikeElements.push( value.item );
-		}
-	}
-
-	return itemLikeElements;
-}
diff --git a/src/utils.js b/src/utils.js
index ce9412cd2..d7240301f 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -21,7 +21,7 @@ export function renderEquation( equation, element, engine = 'katex', display = f
 			MathJax.tex2chtmlPromise( equation, options ).then( node => {
 				if ( element.firstChild ) {
 					element.firstChild.replaceWith( node );
-				} {
+				} else {
 					element.appendChild( node );
 				}
 				MathJax.startup.document.clear();