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Math/modules/MathJax/extensions/tex2jax.js

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/*************************************************************
*
* 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) 2009-2012 Design Science, Inc.
*
* 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: "2.0",
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)
],
balanceBraces: true, // determines whether tex2jax requires braces to be
// balanced within math delimiters (allows for nested
// dollar signs). Set to false to get pre-v2.0 compatibility.
skipTags: ["script","noscript","style","textarea","pre","code"],
// 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.
},
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("|")+")$","i");
this.ignoreClass = new RegExp("(^| )("+config.ignoreClass+")( |$)");
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;
this.search = {start: true};
this.pattern = this.start;
while (element) {
this.pattern.lastIndex = 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)}
if (element) {
do {prev = element; element = element.nextSibling}
while (element && (element.nodeName.toLowerCase() === 'br' ||
element.nodeName.toLowerCase() === '#comment'));
if (!element || element.nodeName !== '#text')
{return (this.search.close ? this.prevEndMatch() : prev)}
}
}
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,
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);
}
}
else 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;
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 (math.nextSibling && math.nextSibling !== close) {
if (math.nextSibling.nodeValue !== null) {
if (math.nextSibling.nodeName === "#comment") {
math.nodeValue += math.nextSibling.nodeValue.replace(/^\[CDATA\[((.|\n|\r)*)\]\]$/,"$1");
} else {
math.nodeValue += math.nextSibling.nodeValue;
}
} else if (this.msieNewlineBug) {
math.nodeValue += (math.nextSibling.nodeName.toLowerCase() === "br" ? "\n" : " ");
} else {
math.nodeValue += " ";
}
math.parentNode.removeChild(math.nextSibling);
}
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 preview;
if (this.config.preview === "TeX") {preview = [this.filterPreview(tex)]}
else if (this.config.preview instanceof Array) {preview = this.config.preview}
if (preview) {
preview = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},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},
msieNewlineBug: (MathJax.Hub.Browser.isMSIE && document.documentMode < 9)
};
MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.tex2jax]);
MathJax.Ajax.loadComplete("[MathJax]/extensions/tex2jax.js");
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