mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Math
synced 2024-11-26 00:15:32 +00:00
229 lines
9 KiB
JavaScript
229 lines
9 KiB
JavaScript
/*************************************************************
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*
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* MathJax/extensions/asciimath2jax.js
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*
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* Implements the AsciiMath to Jax preprocessor that locates AsciiMath
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* code within the text of a document and replaces it with SCRIPT tags for
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* processing by MathJax.
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*
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* Modified by David Lippman, based on tex2jax.js.
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* Additional work by Davide P. Cervone.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2012 Design Science, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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MathJax.Extension.asciimath2jax = {
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version: "2.0",
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config: {
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delimiters: [['`','`']], // The star/stop delimiter pairs for asciimath code
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skipTags: ["script","noscript","style","textarea","pre","code"],
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// The names of the tags whose contents will not be
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// scanned for math delimiters
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ignoreClass: "asciimath2jax_ignore", // the class name of elements whose contents should
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// NOT be processed by asciimath2jax. Note that this
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// is a regular expression, so be sure to quote any
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// regexp special characters
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processClass: "asciimath2jax_process", // the class name of elements whose contents SHOULD
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// be processed when they appear inside ones that
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// are ignored. Note that this is a regular expression,
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// so be sure to quote any regexp special characters
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preview: "AsciiMath" // set to "none" to not insert MathJax_Preview spans
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// or set to an array specifying an HTML snippet
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// to use the same preview for every equation.
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},
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PreProcess: function (element) {
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if (!this.configured) {
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this.config = MathJax.Hub.CombineConfig("asciimath2jax",this.config);
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if (this.config.Augment) {MathJax.Hub.Insert(this,this.config.Augment)}
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this.configured = true;
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}
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if (typeof(element) === "string") {element = document.getElementById(element)}
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if (!element) {element = document.body}
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if (this.createPatterns()) {this.scanElement(element,element.nextSibling)}
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},
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createPatterns: function () {
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var starts = [], i, m, config = this.config; this.match = {};
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if (config.delimiters.length === 0) {return false}
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for (i = 0, m = config.delimiters.length; i < m; i++) {
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starts.push(this.patternQuote(config.delimiters[i][0]));
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this.match[config.delimiters[i][0]] = {
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mode: "",
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end: config.delimiters[i][1],
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pattern: this.endPattern(config.delimiters[i][1])
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};
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}
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this.start = new RegExp(starts.sort(this.sortLength).join("|"),"g");
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this.skipTags = new RegExp("^("+config.skipTags.join("|")+")$","i");
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this.ignoreClass = new RegExp("(^| )("+config.ignoreClass+")( |$)");
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this.processClass = new RegExp("(^| )("+config.processClass+")( |$)");
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return true;
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},
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patternQuote: function (s) {return s.replace(/([\^$(){}+*?\-|\[\]\:\\])/g,'\\$1')},
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endPattern: function (end) {
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return new RegExp(this.patternQuote(end)+"|\\\\.","g");
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},
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sortLength: function (a,b) {
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if (a.length !== b.length) {return b.length - a.length}
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return (a == b ? 0 : (a < b ? -1 : 1));
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},
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scanElement: function (element,stop,ignore) {
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var cname, tname, ignoreChild, process;
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while (element && element != stop) {
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if (element.nodeName.toLowerCase() === '#text') {
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if (!ignore) {element = this.scanText(element)}
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} else {
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cname = (typeof(element.className) === "undefined" ? "" : element.className);
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tname = (typeof(element.tagName) === "undefined" ? "" : element.tagName);
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if (typeof(cname) !== "string") {cname = String(cname)} // jsxgraph uses non-string class names!
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process = this.processClass.exec(cname);
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if (element.firstChild && !cname.match(/(^| )MathJax/) &&
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(process || !this.skipTags.exec(tname))) {
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ignoreChild = (ignore || this.ignoreClass.exec(cname)) && !process;
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this.scanElement(element.firstChild,stop,ignoreChild);
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}
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}
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if (element) {element = element.nextSibling}
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}
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},
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scanText: function (element) {
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if (element.nodeValue.replace(/\s+/,'') == '') {return element}
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var match, prev;
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this.search = {start: true};
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this.pattern = this.start;
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while (element) {
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this.pattern.lastIndex = 0;
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while (element && element.nodeName.toLowerCase() === '#text' &&
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(match = this.pattern.exec(element.nodeValue))) {
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if (this.search.start) {element = this.startMatch(match,element)}
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else {element = this.endMatch(match,element)}
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}
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if (this.search.matched) {element = this.encloseMath(element)}
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if (element) {
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do {prev = element; element = element.nextSibling}
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while (element && (element.nodeName.toLowerCase() === 'br' ||
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element.nodeName.toLowerCase() === '#comment'));
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if (!element || element.nodeName !== '#text') {return prev}
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}
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}
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return element;
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},
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startMatch: function (match,element) {
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var delim = this.match[match[0]];
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if (delim != null) {
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this.search = {
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end: delim.end, mode: delim.mode,
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open: element, olen: match[0].length,
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opos: this.pattern.lastIndex - match[0].length
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};
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this.switchPattern(delim.pattern);
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}
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return element;
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},
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endMatch: function (match,element) {
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if (match[0] == this.search.end) {
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this.search.close = element;
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this.search.cpos = this.pattern.lastIndex;
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this.search.clen = (this.search.isBeginEnd ? 0 : match[0].length);
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this.search.matched = true;
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element = this.encloseMath(element);
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this.switchPattern(this.start);
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}
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return element;
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},
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switchPattern: function (pattern) {
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pattern.lastIndex = this.pattern.lastIndex;
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this.pattern = pattern;
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this.search.start = (pattern === this.start);
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},
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encloseMath: function (element) {
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var search = this.search, close = search.close, CLOSE, math;
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if (search.cpos === close.length) {close = close.nextSibling}
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else {close = close.splitText(search.cpos)}
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if (!close) {CLOSE = close = MathJax.HTML.addText(search.close.parentNode,"")}
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search.close = close;
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math = (search.opos ? search.open.splitText(search.opos) : search.open);
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while (math.nextSibling && math.nextSibling !== close) {
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if (math.nextSibling.nodeValue !== null) {
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if (math.nextSibling.nodeName === "#comment") {
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math.nodeValue += math.nextSibling.nodeValue.replace(/^\[CDATA\[((.|\n|\r)*)\]\]$/,"$1");
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} else {
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math.nodeValue += math.nextSibling.nodeValue;
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}
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} else if (this.msieNewlineBug) {
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math.nodeValue += (math.nextSibling.nodeName.toLowerCase() === "br" ? "\n" : " ");
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} else {
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math.nodeValue += " ";
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}
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math.parentNode.removeChild(math.nextSibling);
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}
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var AM = math.nodeValue.substr(search.olen,math.nodeValue.length-search.olen-search.clen);
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math.parentNode.removeChild(math);
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if (this.config.preview !== "none") {this.createPreview(search.mode,AM)}
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math = this.createMathTag(search.mode,AM);
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this.search = {}; this.pattern.lastIndex = 0;
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if (CLOSE) {CLOSE.parentNode.removeChild(CLOSE)}
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return math;
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},
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insertNode: function (node) {
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var search = this.search;
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search.close.parentNode.insertBefore(node,search.close);
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},
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createPreview: function (mode,asciimath) {
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var preview;
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if (this.config.preview === "AsciiMath") {preview = [this.filterPreview(asciimath)]}
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else if (this.config.preview instanceof Array) {preview = this.config.preview}
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if (preview) {
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preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
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this.insertNode(preview);
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}
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},
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createMathTag: function (mode,asciimath) {
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var script = document.createElement("script");
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script.type = "math/asciimath" + mode;
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MathJax.HTML.setScript(script,asciimath);
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this.insertNode(script);
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return script;
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},
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filterPreview: function (asciimath) {return asciimath},
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msieNewlineBug: (MathJax.Hub.Browser.isMSIE && (document.documentMode||0) < 9)
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};
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MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.asciimath2jax]);
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MathJax.Ajax.loadComplete("[MathJax]/extensions/asciimath2jax.js");
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