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91 lines
3.2 KiB
JavaScript
91 lines
3.2 KiB
JavaScript
// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/5/LICENSE
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// Utility function that allows modes to be combined. The mode given
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// as the base argument takes care of most of the normal mode
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// functionality, but a second (typically simple) mode is used, which
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// can override the style of text. Both modes get to parse all of the
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// text, but when both assign a non-null style to a piece of code, the
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// overlay wins, unless the combine argument was true and not overridden,
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// or state.overlay.combineTokens was true, in which case the styles are
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// combined.
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(function(mod) {
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if (typeof exports == "object" && typeof module == "object") // CommonJS
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mod(require("../../lib/codemirror"));
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else if (typeof define == "function" && define.amd) // AMD
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define(["../../lib/codemirror"], mod);
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else // Plain browser env
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mod(CodeMirror);
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})(function(CodeMirror) {
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"use strict";
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CodeMirror.overlayMode = function(base, overlay, combine) {
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return {
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startState: function() {
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return {
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base: CodeMirror.startState(base),
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overlay: CodeMirror.startState(overlay),
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basePos: 0, baseCur: null,
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overlayPos: 0, overlayCur: null,
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streamSeen: null
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};
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},
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copyState: function(state) {
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return {
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base: CodeMirror.copyState(base, state.base),
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overlay: CodeMirror.copyState(overlay, state.overlay),
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basePos: state.basePos, baseCur: null,
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overlayPos: state.overlayPos, overlayCur: null
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};
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},
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token: function(stream, state) {
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if (stream != state.streamSeen ||
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Math.min(state.basePos, state.overlayPos) < stream.start) {
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state.streamSeen = stream;
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state.basePos = state.overlayPos = stream.start;
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}
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if (stream.start == state.basePos) {
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state.baseCur = base.token(stream, state.base);
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state.basePos = stream.pos;
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}
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if (stream.start == state.overlayPos) {
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stream.pos = stream.start;
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state.overlayCur = overlay.token(stream, state.overlay);
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state.overlayPos = stream.pos;
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}
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stream.pos = Math.min(state.basePos, state.overlayPos);
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// state.overlay.combineTokens always takes precedence over combine,
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// unless set to null
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if (state.overlayCur == null) return state.baseCur;
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else if (state.baseCur != null &&
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state.overlay.combineTokens ||
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combine && state.overlay.combineTokens == null)
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return state.baseCur + " " + state.overlayCur;
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else return state.overlayCur;
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},
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indent: base.indent && function(state, textAfter, line) {
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return base.indent(state.base, textAfter, line);
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},
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electricChars: base.electricChars,
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innerMode: function(state) { return {state: state.base, mode: base}; },
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blankLine: function(state) {
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var baseToken, overlayToken;
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if (base.blankLine) baseToken = base.blankLine(state.base);
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if (overlay.blankLine) overlayToken = overlay.blankLine(state.overlay);
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return overlayToken == null ?
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baseToken :
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(combine && baseToken != null ? baseToken + " " + overlayToken : overlayToken);
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}
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};
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};
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});
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