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Diffstat (limited to 'js/mathjax/extensions/tex2jax.js')
| -rw-r--r-- | js/mathjax/extensions/tex2jax.js | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/js/mathjax/extensions/tex2jax.js b/js/mathjax/extensions/tex2jax.js new file mode 100644 index 0000000..cfc3c0b --- /dev/null +++ b/js/mathjax/extensions/tex2jax.js @@ -0,0 +1,321 @@ +// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7dn=apache-2.0.txt Apache-2.0 +/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ + +/************************************************************* + * + * MathJax/extensions/tex2jax.js + * + * Implements the TeX to Jax preprocessor that locates TeX code + * within the text of a document and replaces it with SCRIPT tags + * for processing by MathJax. + * + * --------------------------------------------------------------------- + * + * Copyright (c) 2009-2020 The MathJax Consortium + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +MathJax.Extension.tex2jax = { + version: "2.7.9", + config: { + inlineMath: [ // The start/stop pairs for in-line math +// ['$','$'], // (comment out any you don't want, or add your own, but + ['\\(','\\)'] // be sure that you don't have an extra comma at the end) + ], + + displayMath: [ // The start/stop pairs for display math + ['$$','$$'], // (comment out any you don't want, or add your own, but + ['\\[','\\]'] // be sure that you don't have an extra comma at the end) + ], + + skipTags: ["script","noscript","style","textarea","pre","code","annotation","annotation-xml"], + // The names of the tags whose contents will not be + // scanned for math delimiters + + ignoreClass: "tex2jax_ignore", // the class name of elements whose contents should + // NOT be processed by tex2jax. Note that this + // is a regular expression, so be sure to quote any + // regexp special characters + + processClass: "tex2jax_process", // the class name of elements whose contents SHOULD + // be processed when they appear inside ones that + // are ignored. Note that this is a regular expression, + // so be sure to quote any regexp special characters + + processEscapes: false, // set to true to allow \$ to produce a dollar without + // starting in-line math mode + + processEnvironments: true, // set to true to process \begin{xxx}...\end{xxx} outside + // of math mode, false to prevent that + + processRefs: true, // set to true to process \ref{...} outside of math mode + + + preview: "TeX" // set to "none" to not insert MathJax_Preview spans + // or set to an array specifying an HTML snippet + // to use the same preview for every equation. + + }, + + // + // Tags to ignore when searching for TeX in the page + // + ignoreTags: { + br: (MathJax.Hub.Browser.isMSIE && document.documentMode < 9 ? "\n" : " "), + wbr: "", + "#comment": "" + }, + + PreProcess: function (element) { + if (!this.configured) { + this.config = MathJax.Hub.CombineConfig("tex2jax",this.config); + if (this.config.Augment) {MathJax.Hub.Insert(this,this.config.Augment)} + if (typeof(this.config.previewTeX) !== "undefined" && !this.config.previewTeX) + {this.config.preview = "none"} // backward compatibility for previewTeX parameter + this.configured = true; + } + if (typeof(element) === "string") {element = document.getElementById(element)} + if (!element) {element = document.body} + if (this.createPatterns()) {this.scanElement(element,element.nextSibling)} + }, + + createPatterns: function () { + var starts = [], parts = [], i, m, config = this.config; + this.match = {}; + for (i = 0, m = config.inlineMath.length; i < m; i++) { + starts.push(this.patternQuote(config.inlineMath[i][0])); + this.match[config.inlineMath[i][0]] = { + mode: "", + end: config.inlineMath[i][1], + pattern: this.endPattern(config.inlineMath[i][1]) + }; + } + for (i = 0, m = config.displayMath.length; i < m; i++) { + starts.push(this.patternQuote(config.displayMath[i][0])); + this.match[config.displayMath[i][0]] = { + mode: "; mode=display", + end: config.displayMath[i][1], + pattern: this.endPattern(config.displayMath[i][1]) + }; + } + if (starts.length) {parts.push(starts.sort(this.sortLength).join("|"))} + if (config.processEnvironments) {parts.push("\\\\begin\\{([^}]*)\\}")} + if (config.processEscapes) {parts.push("\\\\*\\\\\\\$")} + if (config.processRefs) {parts.push("\\\\(eq)?ref\\{[^}]*\\}")} + this.start = new RegExp(parts.join("|"),"g"); + this.skipTags = new RegExp("^("+config.skipTags.join("|")+")$","i"); + var ignore = []; + if (MathJax.Hub.config.preRemoveClass) {ignore.push(MathJax.Hub.config.preRemoveClass)}; + if (config.ignoreClass) {ignore.push(config.ignoreClass)} + this.ignoreClass = (ignore.length ? new RegExp("(^| )("+ignore.join("|")+")( |$)") : /^$/); + this.processClass = new RegExp("(^| )("+config.processClass+")( |$)"); + return (parts.length > 0); + }, + + patternQuote: function (s) {return s.replace(/([\^$(){}+*?\-|\[\]\:\\])/g,'\\$1')}, + + endPattern: function (end) { + return new RegExp(this.patternQuote(end)+"|\\\\.|[{}]","g"); + }, + + sortLength: function (a,b) { + if (a.length !== b.length) {return b.length - a.length} + return (a == b ? 0 : (a < b ? -1 : 1)); + }, + + scanElement: function (element,stop,ignore) { + var cname, tname, ignoreChild, process; + while (element && element != stop) { + if (element.nodeName.toLowerCase() === '#text') { + if (!ignore) {element = this.scanText(element)} + } else { + cname = (typeof(element.className) === "undefined" ? "" : element.className); + tname = (typeof(element.tagName) === "undefined" ? "" : element.tagName); + if (typeof(cname) !== "string") {cname = String(cname)} // jsxgraph uses non-string class names! + process = this.processClass.exec(cname); + if (element.firstChild && !cname.match(/(^| )MathJax/) && + (process || !this.skipTags.exec(tname))) { + ignoreChild = (ignore || this.ignoreClass.exec(cname)) && !process; + this.scanElement(element.firstChild,stop,ignoreChild); + } + } + if (element) {element = element.nextSibling} + } + }, + + scanText: function (element) { + if (element.nodeValue.replace(/\s+/,'') == '') {return element} + var match, prev, pos = 0, rescan; + this.search = {start: true}; + this.pattern = this.start; + while (element) { + rescan = null; + this.pattern.lastIndex = pos; pos = 0; + while (element && element.nodeName.toLowerCase() === '#text' && + (match = this.pattern.exec(element.nodeValue))) { + if (this.search.start) {element = this.startMatch(match,element)} + else {element = this.endMatch(match,element)} + } + if (this.search.matched) element = this.encloseMath(element); + else if (!this.search.start && !this.search.close) rescan = this.search; + if (element) { + do {prev = element; element = element.nextSibling} + while (element && this.ignoreTags[element.nodeName.toLowerCase()] != null); + if (!element || element.nodeName !== '#text') { + if (!rescan) return (this.search.close ? this.prevEndMatch() : prev); + element = rescan.open; + pos = rescan.opos + rescan.olen + (rescan.blen || 0); + this.search = {start: true}; + this.pattern = this.start; + } + } + } + return element; + }, + + startMatch: function (match,element) { + var delim = this.match[match[0]]; + if (delim != null) { // a start delimiter + this.search = { + end: delim.end, mode: delim.mode, pcount: 0, + open: element, olen: match[0].length, opos: this.pattern.lastIndex - match[0].length + }; + this.switchPattern(delim.pattern); + } else if (match[0].substr(0,6) === "\\begin") { // \begin{...} + this.search = { + end: "\\end{"+match[1]+"}", mode: "; mode=display", pcount: 0, + open: element, olen: 0, opos: this.pattern.lastIndex - match[0].length, + blen: match[1].length + 3, isBeginEnd: true + }; + this.switchPattern(this.endPattern(this.search.end)); + } else if (match[0].substr(0,4) === "\\ref" || match[0].substr(0,6) === "\\eqref") { + this.search = { + mode: "", end: "", open: element, pcount: 0, + olen: 0, opos: this.pattern.lastIndex - match[0].length + } + return this.endMatch([""],element); + } else { // escaped dollar signs + // put $ in a span so it doesn't get processed again + // split off backslashes so they don't get removed later + var slashes = match[0].substr(0,match[0].length-1), n, span; + if (slashes.length % 2 === 0) {span = [slashes.replace(/\\\\/g,"\\")]; n = 1} + else {span = [slashes.substr(1).replace(/\\\\/g,"\\"),"$"]; n = 0} + span = MathJax.HTML.Element("span",null,span); + var text = MathJax.HTML.TextNode(element.nodeValue.substr(0,match.index)); + element.nodeValue = element.nodeValue.substr(match.index + match[0].length - n); + element.parentNode.insertBefore(span,element); + element.parentNode.insertBefore(text,span); + this.pattern.lastIndex = n; + } + return element; + }, + + endMatch: function (match,element) { + var search = this.search; + if (match[0] == search.end) { + if (!search.close || search.pcount === 0) { + search.close = element; + search.cpos = this.pattern.lastIndex; + search.clen = (search.isBeginEnd ? 0 : match[0].length); + } + if (search.pcount === 0) { + search.matched = true; + element = this.encloseMath(element); + this.switchPattern(this.start); + } + } + if (match[0] === "{") {search.pcount++} + else if (match[0] === "}" && search.pcount) {search.pcount--} + return element; + }, + prevEndMatch: function () { + this.search.matched = true; + var element = this.encloseMath(this.search.close); + this.switchPattern(this.start); + return element; + }, + + switchPattern: function (pattern) { + pattern.lastIndex = this.pattern.lastIndex; + this.pattern = pattern; + this.search.start = (pattern === this.start); + }, + + encloseMath: function (element) { + var search = this.search, close = search.close, CLOSE, math, next; + if (search.cpos === close.length) {close = close.nextSibling} + else {close = close.splitText(search.cpos)} + if (!close) {CLOSE = close = MathJax.HTML.addText(search.close.parentNode,"")} + search.close = close; + math = (search.opos ? search.open.splitText(search.opos) : search.open); + while ((next = math.nextSibling) && next !== close) { + if (next.nodeValue !== null) { + if (next.nodeName === "#comment") { + math.nodeValue += next.nodeValue.replace(/^\[CDATA\[((.|\n|\r)*)\]\]$/,"$1"); + } else { + math.nodeValue += next.nodeValue; + } + } else { + var ignore = this.ignoreTags[next.nodeName.toLowerCase()]; + math.nodeValue += (ignore == null ? " " : ignore); + } + math.parentNode.removeChild(next); + } + var TeX = math.nodeValue.substr(search.olen,math.nodeValue.length-search.olen-search.clen); + math.parentNode.removeChild(math); + if (this.config.preview !== "none") {this.createPreview(search.mode,TeX)} + math = this.createMathTag(search.mode,TeX); + this.search = {}; this.pattern.lastIndex = 0; + if (CLOSE) {CLOSE.parentNode.removeChild(CLOSE)} + return math; + }, + + insertNode: function (node) { + var search = this.search; + search.close.parentNode.insertBefore(node,search.close); + }, + + createPreview: function (mode,tex) { + var previewClass = MathJax.Hub.config.preRemoveClass; + var preview = this.config.preview; + if (preview === "none") return; + if ((this.search.close.previousSibling||{}).className === previewClass) return; + if (preview === "TeX") {preview = [this.filterPreview(tex)]} + if (preview) { + preview = MathJax.HTML.Element("span",{className:previewClass},preview); + this.insertNode(preview); + } + }, + + createMathTag: function (mode,tex) { + var script = document.createElement("script"); + script.type = "math/tex" + mode; + MathJax.HTML.setScript(script,tex); + this.insertNode(script); + return script; + }, + + filterPreview: function (tex) {return tex} + +}; + +// We register the preprocessors with the following priorities: +// - mml2jax.js: 5 +// - jsMath2jax.js: 8 +// - asciimath2jax.js, tex2jax.js: 10 (default) +// See issues 18 and 484 and the other *2jax.js files. +MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.tex2jax]); +MathJax.Ajax.loadComplete("[MathJax]/extensions/tex2jax.js"); +// @license-end |