+++ /dev/null
-/*
- * tex2math.js
- *
- * Part of the jsMath package for mathematics on the web.
- *
- * This file is a plugin that searches text within a web page
- * for \(...\), \[...\], $...$ and $$...$$ and converts them to
- * the appropriate <SPAN CLASS="math">...</SPAN> or
- * <DIV CLASS="math">...</DIV> tags.
- *
- * ---------------------------------------------------------------------
- *
- * Copyright 2004-2007 by Davide P. Cervone
- *
- * 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.
- */
-
-if (!jsMath.tex2math) {jsMath.tex2math = {}} // make sure jsMath.tex2math is defined
-if (!jsMath.tex2math.loaded) { // only load it once
-
-if (!jsMath.Controls) {jsMath.Controls = {}}
-if (!jsMath.Controls.cookie) {jsMath.Controls.cookie = {}}
-
-jsMath.Add(jsMath.tex2math,{
-
- loaded: 1,
- window: window,
-
- /*
- * Call the main conversion routine with appropriate flags
- */
-
- ConvertTeX: function (element) {
- this.Convert(element,{
- processSingleDollars: 1, processDoubleDollars: 1,
- processSlashParens: 1, processSlashBrackets: 1,
- processLaTeXenvironments: 0,
- custom: 0, fixEscapedDollars: 1
- });
- },
-
- ConvertTeX2: function (element) {
- this.Convert(element,{
- processSingleDollars: 0, processDoubleDollars: 1,
- processSlashParens: 1, processSlashBrackets: 1,
- processLaTeXenvironments: 0,
- custom: 0, fixEscapedDollars: 0
- });
- },
-
- ConvertLaTeX: function (element) {
- this.Convert(element,{
- processSingleDollars: 0, processDoubleDollars: 0,
- processSlashParens: 1, processSlashBrackets: 1,
- processLaTeXenvironments: 1,
- custom: 0, fixEscapedDollars: 0
- });
- },
-
- ConvertCustom: function (element) {
- this.Convert(element,{custom: 1, fixEscapedDollars: 0});
- },
-
- /*******************************************************************/
-
- /*
- * Define a custom search by indicating the
- * strings to use for starting and ending
- * in-line and display mathematics
- */
- CustomSearch: function (iOpen,iClose,dOpen,dClose) {
- this.inLineOpen = iOpen; this.inLineClose = iClose;
- this.displayOpen = dOpen; this.displayClose = dClose;
- this.createPattern('customPattern',new RegExp(
- '('+this.patternQuote(dOpen)+'|'
- +this.patternQuote(iOpen)+'|'
- +this.patternQuote(dClose)+'|'
- +this.patternQuote(iClose)+'|\\\\.)','g'
- ));
- },
-
- patternQuote: function (s) {
- s = s.replace(/([\^$(){}+*?\-|\[\]\:\\])/g,'\\$1');
- return s;
- },
-
- /*
- * MSIE on the Mac doesn't handle lastIndex correctly, so
- * override it and implement it correctly.
- */
- createPattern: function (name,pattern) {
- jsMath.tex2math[name] = pattern;
- if (this.fixPatterns) {
- pattern.oldExec = pattern.exec;
- pattern.exec = this.msiePatternExec;
- }
- },
- msiePatternExec: function (string) {
- if (this.lastIndex == null) (this.lastIndex = 0);
- var match = this.oldExec(string.substr(this.lastIndex));
- if (match) {this.lastIndex += match.lastIndex}
- else {this.lastIndex = null}
- return match;
- },
-
- /*******************************************************************/
-
- /*
- * Set up for the correct type of search, and recursively
- * convert the mathematics. Disable tex2math if the cookie
- * isn't set, or of there is an element with ID of 'tex2math_off'.
- */
- Convert: function (element,flags) {
- this.Init();
- if (!element) {element = jsMath.document.body}
- if (typeof(element) == 'string') {element = jsMath.document.getElementById(element)}
- if (jsMath.Controls.cookie.tex2math &&
- (!jsMath.tex2math.allowDisableTag || !jsMath.document.getElementById('tex2math_off'))) {
- this.custom = 0; for (var i in flags) {this[i] = flags[i]}
- if (this.custom) {
- this.pattern = this.customPattern;
- this.ProcessMatch = this.customProcessMatch;
- } else {
- this.pattern = this.stdPattern;
- this.ProcessMatch = this.stdProcessMatch;
- }
- if (this.processDoubleDollars || this.processSingleDollars ||
- this.processSlashParens || this.processSlashBrackets ||
- this.processLaTeXenvironments || this.custom) this.ScanElement(element);
- }
- },
-
- /*
- * Recursively look through a document for text nodes that could
- * contain mathematics.
- */
- ScanElement: function (element,ignore) {
- if (!element) {element = jsMath.document.body}
- if (typeof(element) == 'string') {element = jsMath.document.getElementById(element)}
- while (element) {
- if (element.nodeName == '#text') {
- if (!ignore) {element = this.ScanText(element)}
- } else {
- if (element.className == null) {element.className = ''}
- if (element.firstChild && element.className != 'math') {
- var off = ignore || element.className.match(/(^| )tex2math_ignore( |$)/) ||
- (element.tagName && element.tagName.match(/^(script|noscript|style|textarea|pre|code)$/i));
- off = off && !element.className.match(/(^| )tex2math_process( |$)/);
- this.ScanElement(element.firstChild,off);
- }
- }
- if (element) {element = element.nextSibling}
- }
- },
-
- /*
- * Looks through a text element for math delimiters and
- * process them. If <BR> tags are found in the middle, they
- * are ignored (this is for BBS systems that have editors
- * that insert these automatically).
- */
- ScanText: function (element) {
- if (element.nodeValue.replace(/\s+/,'') == '') {return element}
- var match; var prev; this.search = {};
- while (element) {
- this.pattern.lastIndex = 0;
- while (element && element.nodeName == '#text' &&
- (match = this.pattern.exec(element.nodeValue))) {
- this.pattern.match = match;
- element = this.ProcessMatch(match[0],match.index,element);
- }
- if (this.search.matched) {element = this.EncloseMath(element)}
- if (!element) {return null}
- prev = element; element = element.nextSibling;
- while (element && (element.nodeName.toLowerCase() == 'br' ||
- element.nodeName.toLowerCase() == "#comment"))
- {prev = element; element = element.nextSibling}
- if (!element || element.nodeName != '#text') {return prev}
- }
- return element;
- },
-
- /*
- * If a matching end tag has been found, process the mathematics.
- * Otherwise, update the search data for the given delimiter,
- * or ignore it, as the item dictates.
- */
- stdProcessMatch: function (match,index,element) {
- if (match == this.search.end) {
- this.search.close = element;
- this.search.cpos = this.pattern.lastIndex;
- this.search.clength = (match.substr(0,4) == '\\end' ? 0 : match.length);
- element = this.EncloseMath(element);
- } else {
- switch (match) {
- case '\\(':
- if ((this.search.end == null ||
- (this.search.end != '$' && this.search.end != '$$')) &&
- this.processSlashParens) {
- this.ScanMark('span',element,'\\)');
- }
- break;
-
- case '\\[':
- if ((this.search.end == null ||
- (this.search.end != '$' && this.search.end != '$$')) &&
- this.processSlashBrackets) {
- this.ScanMark('div',element,'\\]');
- }
- break;
-
- case '$$':
- if (this.processDoubleDollars) {
- var type = (this.doubleDollarsAreInLine? 'span': 'div');
- this.ScanMark(type,element,'$$');
- }
- break;
-
- case '$':
- if (this.search.end == null && this.processSingleDollars) {
- this.ScanMark('span',element,'$');
- }
- break;
-
- case '\\$':
- if (this.search.end == null && this.fixEscapedDollars) {
- element.nodeValue = element.nodeValue.substr(0,index)
- + element.nodeValue.substr(index+1);
- this.pattern.lastIndex--;
- }
- break;
-
- case '\\\\':
- break;
-
- default:
- if (match.substr(0,6) == '\\begin' && this.search.end == null &&
- this.processLaTeXenvironments) {
- this.ScanMark('div',element,'\\end'+match.substr(6));
- this.search.olength = 0;
- }
- break;
- }
- }
- return element;
- },
-
- /*
- * If a matching end tag has been found, process the mathematics.
- * Otherwise, update the search data for the given delimiter,
- * or ignore it, as the item dictates.
- */
- customProcessMatch: function (match,index,element) {
- if (match == this.search.end) {
- this.search.close = element;
- this.search.clength = match.length;
- this.search.cpos = this.pattern.lastIndex;
- if (match == this.inLineOpen || match == this.displayOpen) {
- element = this.EncloseMath(element);
- } else {this.search.matched = 1}
- } else if (match == this.inLineOpen) {
- if (this.search.matched) {element = this.EncloseMath(element)}
- this.ScanMark('span',element,this.inLineClose);
- } else if (match == this.displayOpen) {
- if (this.search.matched) {element = this.EncloseMath(element)}
- this.ScanMark('div',element,this.displayClose);
- }
- return element;
- },
-
- /*
- * Return a structure that records the starting location
- * for the math element, and the end delimiter we want to find.
- */
- ScanMark: function (type,element,end) {
- var len = this.pattern.match[1].length;
- this.search = {
- type: type, end: end, open: element, olength: len,
- pos: this.pattern.lastIndex - len
- };
- },
-
- /*******************************************************************/
-
- /*
- * Surround the mathematics by an appropriate
- * SPAN or DIV element marked as CLASS="math".
- */
- EncloseMath: function (element) {
- var search = this.search; search.end = null;
- var close = search.close;
- if (search.cpos == close.length) {close = close.nextSibling}
- else {close = close.splitText(search.cpos)}
- if (!close) {close = jsMath.document.createTextNode("")}
- if (element == search.close) {element = close}
- var math = search.open.splitText(search.pos);
- while (math.nextSibling && math.nextSibling != close) {
- if (math.nextSibling.nodeValue !== null) {
- if (math.nextSibling.nodeName.toLowerCase() === "#comment") {
- math.nodeValue += math.nextSibling.nodeValue.replace(/^\[CDATA\[(.*)\]\]$/,"$1");
- } else {
- math.nodeValue += math.nextSibling.nodeValue;
- }
- } else {
- math.nodeValue += ' ';
- }
- math.parentNode.removeChild(math.nextSibling);
- }
- var TeX = math.nodeValue.substr(search.olength,
- math.nodeValue.length-search.olength-search.clength);
- math.parentNode.removeChild(math);
- math = this.createMathTag(search.type,TeX);
- //
- // This is where older, buggy browsers can fail under unpredicatble
- // circumstances, so we trap errors and at least get to continue
- // with the rest of the math. (## should add error message ##)
- //
- try {
- if (close && close.parentNode) {
- close.parentNode.insertBefore(math,close);
- } else if (search.open.nextSibling) {
- search.open.parentNode.insertBefore(math,search.open.nextSibling);
- } else {
- search.open.parentNode.appendChild(math);
- }
- } catch (err) {}
- this.search = {}; this.pattern.lastIndex = 0;
- return math;
- },
-
- /*
- * Create an element for the mathematics
- */
- createMathTag: function (type,text) {
- var tag = jsMath.document.createElement(type); tag.className = "math";
- var math = jsMath.document.createTextNode(text);
- tag.appendChild(math);
- return tag;
- },
-
- //
- // MSIE won't let you insert a DIV within tags that are supposed to
- // contain in-line data (like <P> or <SPAN>), so we have to fake it
- // using SPAN tags that force the formatting to work like DIV. We
- // use a separate SPAN that is the full width of the containing
- // item, and that has the margins and centering from the div.typeset
- // style.
- //
- MSIEcreateMathTag: function (type,text) {
- var tag = jsMath.document.createElement("span");
- tag.className = "math";
- text = text.replace(/</g,'<').replace(/>/g,'>');
- if (type == 'div') {
- tag.className = "tex2math_div";
- text = '<span class="math">\\displaystyle{'+text+'}</span>';
- }
- tag.innerHTML = text;
- return tag;
- },
-
- /*******************************************************************/
-
- Init: function () {
- if (!jsMath.browser && document.all && !window.opera) {
- jsMath.browser = 'MSIE';
- jsMath.platform = (navigator.platform.match(/Mac/) ? "mac" :
- navigator.platform.match(/Win/) ? "pc" : "unix");
- }
- if (this.inited || !jsMath.browser) return;
- /*
- * MSIE can't handle the DIV's properly, so we need to do it by
- * hand. Use an extra SPAN that uses CSS to act like a DIV.
- */
- if (jsMath.browser == 'MSIE' && jsMath.platform == 'pc')
- {this.createMathTag = this.MSIEcreateMathTag}
- this.inited = 1;
- },
-
- /*
- * Test to see if we need to override the pattern exec() call
- * (for MSIE on the Mac).
- */
- TestPatterns: function () {
- var pattern = /a/g;
- var match = pattern.exec("xax");
- this.fixPatterns = (pattern.lastIndex != 2 && match.lastIndex == 2);
- }
-
-});
-
-/*
- * Initialize
- */
-if (jsMath.Controls.cookie.tex2math == null) {jsMath.Controls.cookie.tex2math = 1}
-if (jsMath.tex2math.allowDisableTag == null) {jsMath.tex2math.allowDisableTag = 1}
-jsMath.tex2math.TestPatterns();
-jsMath.tex2math.createPattern('stdPattern',/(\\[\(\)\[\]$\\]|\$\$|\$|\\(begin|end)\{[^}]+\})/g);
-
-}