--- /dev/null
+/*
+ * autoload.js
+ *
+ * Part of the jsMath package for mathematics on the web.
+ *
+ * This file is a plugin that checks if a page contains any math
+ * that must be processed by jsMath, and only loads jsMath.js
+ * when there is.
+ *
+ * You can control the items to look for via the variables
+ *
+ * jsMath.Autoload.findTeXstrings
+ * jsMath.Autoload.findLaTeXstrings
+ * jsMath.Autoload.findCustomStrings
+ * jsMath.Autoload.findCustomSettings
+ *
+ * which control whether to look for TeX strings that will be converted
+ * by jsMath.ConvertTeX(), or LaTeX strings that will be converted by
+ * jsMath.ConvertLaTeX(). By default, the first is true and the second
+ * and third are false. The findCustomStrings can be used to specify your
+ * own delimiters for in-line and display mathematics, e.g.
+ *
+ * jsMath.Autoload.findCustomStrings = [
+ * '[math],'[/math]', // start and end in-line math
+ * '[display]','[/display]' // start and end display math
+ * ];
+ *
+ * Finally, findCustomSettings can be set to an object reference whose
+ * name:value pairs control the individual search settings for tex2math.
+ * (See the plugins/tex2math.js file for more details).
+ *
+ * If any math strings are found, jsMath.js will be loaded automatically,
+ * but not loaded otherwise. If any of the last four are set and TeX math
+ * strings are found, then plugins/tex2ath.js will be loaded
+ * automatically. jsMath.Autoload.needsJsMath will be set to true or
+ * false depending on whether jsMath needed to be loaded.
+ *
+ * The value of jsMath.Autoload.checkElement controls the element to be
+ * searched by the autoload plug-in. If unset, the complete document will
+ * be searched. If set to a string, the element with that name will be
+ * searched. If set to a DOM object, that object and its children will
+ * be searched.
+ *
+ * Finally, there are two additional parameters that control files to
+ * be loaded after jsMath.js, should it be needed. These are
+ *
+ * jsMath.Autoload.loadFonts
+ * jsMath.Autoload.loadFiles
+ *
+ * If jsMath.js is loaded, the fonts contained in the loadFonts array
+ * will be loaded, and the JavaScript files listed in the loadFiles array
+ * will be run. Relative URL's are loaded based from the URL containing
+ * jsMath.js.
+ *
+ * The autoload plugin can be loaded in the document HEAD or in the BODY.
+ * If it is loaded in the HEAD, you will need to call jsMath.Autoload.Check()
+ * at the end of the BODY (say in the window.onload handler) in order to
+ * get it to check the page for math that needs to be tagged, otherwise load
+ * the file at the bottom of the BODY and it will run the check automatically.
+ *
+ * You can call jsMath.Autoload.Run() after the check has been performed
+ * in order to call the appropriate tex2math routines for the given Autoload
+ * settings. You can call jsMath.Autoload.Run() even when jsMath isn't loaded.
+ *
+ * ---------------------------------------------------------------------
+ *
+ * Copyright 2004-2006 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.
+ */
+
+/*************************************************************************/
+
+/*
+ * Make sure jsMath.Autoload is available
+ */
+if (!window.jsMath) {window.jsMath = {}}
+if (jsMath.Autoload == null) {jsMath.Autoload = {}}
+jsMath.Add = function (dst,src) {for (var id in src) {dst[id] = src[id]}};
+jsMath.document = document; // tex2math needs this
+
+jsMath.Add(jsMath.Autoload,{
+
+ Script: {
+
+ request: null, // XMLHttpRequest object (if we can get it)
+ iframe: null, // the hidden iframe (if not)
+ operaXMLHttpRequestBug: (window.opera != null), // is Opera browser
+
+ /*
+ * Get XMLHttpRequest object, if possible, and look up the URL root
+ * (MSIE can't use xmlReuest to load local files, so avoid that)
+ */
+ Init: function () {
+ this.Root();
+ if (window.XMLHttpRequest) {
+ try {this.request = new XMLHttpRequest} catch (err) {}
+ // MSIE and FireFox3 can't use xmlRequest on local files,
+ // but we don't have jsMath.browser yet to tell, so use this check
+ if (this.request && window.location.protocol == "file:") {
+ try {
+ this.request.open("GET",jsMath.Autoload.root+"plugins/autoload.js",false);
+ this.request.send(null);
+ } catch (err) {
+ this.request = null;
+ // Firefox3 has window.postMessage for inter-window communication.
+ // It can be used to handle the new file:// security model,
+ // so set up the listener.
+ if (window.postMessage && window.addEventListener) {
+ this.mustPost = 1;
+ window.addEventListener("message",jsMath.Autoload.Post.Listener,false);
+ }
+ }
+ }
+ }
+ if (!this.request && window.ActiveXObject && !this.mustPost) {
+ var xml = ["MSXML2.XMLHTTP.6.0","MSXML2.XMLHTTP.5.0","MSXML2.XMLHTTP.4.0",
+ "MSXML2.XMLHTTP.3.0","MSXML2.XMLHTTP","Microsoft.XMLHTTP"];
+ for (var i = 0; i < xml.length && !this.request; i++) {
+ try {this.request = new ActiveXObject(xml[i])} catch (err) {}
+ }
+ }
+ },
+
+ /*
+ * Load an external JavaScript file
+ */
+ Load: function (url) {
+ if (this.request && !(this.operaXMLHttpRequestBug && url == 'jsMath.js')) {
+ setTimeout(function () {jsMath.Autoload.Script.xmlLoad(url)},1);
+ } else {
+ this.startLoad(url);
+ }
+ },
+
+ /*
+ * Load an external JavaScript file via XMLHttpRequest
+ */
+ xmlLoad: function (url) {
+ try {
+ this.request.open("GET",jsMath.Autoload.root+url,false);
+ this.request.send(null);
+ } catch (err) {
+ throw Error("autoload: can't load the file '"+url+"'\n"
+ + "Message: "+err.message);
+ }
+ if (this.request.status && this.request.status >= 400) {
+ throw Error("autoload: can't load the file '"+url+"'\n"
+ + "Error status: "+this.request.status);
+ }
+ window.eval(this.request.responseText);
+ this.endLoad();
+ },
+
+ /*
+ * Load an external JavaScript file via jsMath-autoload.html
+ */
+ startLoad: function (url) {
+ this.iframe = document.createElement('iframe');
+ this.iframe.style.visibility = 'hidden';
+ this.iframe.style.position = 'absolute';
+ this.iframe.style.width = '0px';
+ this.iframe.style.height = '0px';
+ if (document.body.firstChild) {
+ document.body.insertBefore(this.iframe,document.body.firstChild);
+ } else {
+ document.body.appendChild(this.iframe);
+ }
+ this.url = url; setTimeout('jsMath.Autoload.Script.setURL()',100);
+ },
+ endLoad: function () {setTimeout('jsMath.Autoload.Script.AfterLoad()',1)},
+
+ /*
+ * Use location.replace() to avoid browsers placing the file in
+ * the history (and messing up the BACK button action). Not
+ * completely effective in Firefox 1.0.x. Safari won't handle
+ * replace() if the document is local (not sure if that's really
+ * the issue, but that's the only time I see it).
+ */
+ setURL: function () {
+ if (this.mustPost) {
+ this.iframe.src = jsMath.Autoload.Post.startLoad(this.url,this.iframe);
+ } else {
+ var url = jsMath.Autoload.root+"jsMath-autoload.html";
+ var doc = this.iframe.contentDocument;
+ if (!doc && this.iframe.contentWindow) {doc = this.iframe.contentWindow.document}
+ if (navigator.vendor == "Apple Computer, Inc." &&
+ document.location.protocol == 'file:') {doc = null}
+ if (doc) {doc.location.replace(url)} else {this.iframe.src = url}
+ }
+ },
+
+ /*
+ * Queue items that need to be postponed until jsMath has run
+ */
+ queue: [],
+ Push: function (name,data) {this.queue[this.queue.length] = [name,data]},
+ RunStack: function () {
+ if (this.tex2math) {jsMath.Autoload.Check2(); return}
+ for (var i = 0; i < this.queue.length; i++) {
+ var name = this.queue[i][0];
+ var data = this.queue[i][1];
+ if (data.length == 1) {jsMath[name](data[0])}
+ else {jsMath[name](data[0],data[1],data[2],data[3])}
+ }
+ this.queue = [];
+ },
+
+ AfterLoad: function () {jsMath.Autoload.Script.RunStack()},
+
+ /*
+ * Look up the jsMath root directory, if it is not already supplied
+ */
+ Root: function () {
+ if (jsMath.Autoload.root) return;
+ var script = document.getElementsByTagName('script');
+ if (script) {
+ for (var i = 0; i < script.length; i++) {
+ var src = script[i].src;
+ if (src && src.match('(^|/|\\\\)plugins/autoload.js$')) {
+ jsMath.Autoload.root = src.replace(/plugins\/autoload.js$/,'');
+ break;
+ }
+ }
+ }
+ }
+
+ },
+
+ /*
+ * Handle window.postMessage() events in Firefox3
+ */
+ Post: {
+ window: null, // iframe we are ing to
+
+ Listener: function (event) {
+ if (event.source != jsMath.Autoload.Post.window) return;
+ var domain = event.origin.replace(/^file:\/\//,'');
+ var ddomain = document.domain.replace(/^file:\/\//,'');
+ if (domain == null || domain == "" || domain == "null") {domain = "localhost"}
+ if (ddomain == null || ddomain == "" || ddomain == "null") {ddomain = "localhost"}
+ if (domain != ddomain || event.data.substr(0,6) != "jsMAL:") return;
+ var type = event.data.substr(6,3).replace(/ /g,'');
+ var message = event.data.substr(10);
+ if (jsMath.Autoload.Post.Commands[type]) (jsMath.Autoload.Post.Commands[type])(message);
+ // cancel event?
+ },
+
+ /*
+ * Commands that can be performed by the listener
+ */
+ Commands: {
+ SCR: function (message) {window.eval(message)},
+ ERR: function (message) {jsMath.Autoload.Script.endLoad()},
+ END: function (message) {jsMath.Autoload.Script.endLoad()}
+ },
+
+ startLoad: function (url,iframe) {
+ this.window = iframe.contentWindow;
+ return jsMath.Autoload.root+"jsMath-loader-post.html?autoload="+url;
+ },
+
+ endLoad: function () {
+ this.window = null;
+ }
+ },
+
+
+ /**************************************************************/
+
+ /*
+ * Load tex2math first (so we can call its search functions
+ * to look to see if anything needs to be turned into math)
+ * if it is needed, otherwise go on to the second check.
+ */
+ Check: function () {
+ if (this.checked) return; this.checked = 1;
+ if ((this.findTeXstrings || this.findLaTeXstrings ||
+ this.findCustomStrings || this.findCustomSettings) &&
+ (!jsMath.tex2math || !jsMath.tex2math.loaded)) {
+ this.Script.tex2math = 1;
+ this.Script.Load('plugins/tex2math.js');
+ } else {
+ if (!jsMath.tex2math) {jsMath.tex2math = {}}
+ this.Check2();
+ }
+ },
+ ReCheck: function () {
+ if (jsMath.loaded) return;
+ this.InitStubs();
+ this.checked = 0;
+ this.Script.queue = [];
+ this.Check();
+ },
+
+ /*
+ * Once tex2math is loaded, use it to check for math that
+ * needs to be tagged for jsMath, and load jsMath if it is needed
+ */
+ Check2: function () {
+ this.Script.tex2math = 0; this.needsJsMath = 0;
+ if (this.checkElement == null) {this.checkElement = null}
+
+ if (this.findTeXstrings) {jsMath.tex2math.ConvertTeX(this.checkElement)}
+ if (this.findLaTeXstrings) {jsMath.tex2math.ConvertLaTeX(this.checkElement)}
+ if (this.findCustomSettings) {jsMath.tex2math.Convert(this.checkElement,this.findCustomSettings)}
+ if (this.findCustomStrings) {
+ var s = this.findCustomStrings;
+ jsMath.tex2math.CustomSearch(s[0],s[1],s[2],s[3]);
+ jsMath.tex2math.ConvertCustom(this.checkElement);
+ }
+
+ this.needsJsMath = this.areMathElements(this.checkElement);
+ if (this.needsJsMath) {
+ this.LoadJsMath();
+ } else {
+ jsMath.Process = function () {};
+ jsMath.ProcessBeforeShowing = function () {};
+ jsMath.ProcessElement = function () {};
+ jsMath.ConvertTeX = function () {};
+ jsMath.ConvertTeX2 = function () {};
+ jsMath.ConvertLaTeX = function () {};
+ jsMath.ConvertCustom = function () {};
+ jsMath.CustomSearch = function () {};
+ jsMath.Macro = function () {};
+ jsMath.Synchronize = function (code,data) {
+ if (typeof(code) == 'string') {eval(code)} else {code(data)}
+ };
+ jsMath.Autoload.Script.RunStack(); // perform pending commands
+ jsMath.Autoload.setMessage();
+ }
+ },
+
+ /*
+ * A callback used in the tex2math searches to signal that
+ * some math has been found.
+ */
+ tex2mathCallback: function () {
+ jsMath.Autoload.needsJsMath = 1;
+ return false;
+ },
+
+ /*
+ * jsMath.Autoload.Run() is now longer needed
+ */
+ Run: function (data) {},
+
+ /*
+ * Look to see if there are SPAN or DIV elements of class "math".
+ */
+ areMathElements: function (obj) {
+ if (!obj) {obj = document}
+ if (typeof(obj) == 'string') {obj = document.getElementById(obj)}
+ if (!obj.getElementsByTagName) {return false}
+ var math = obj.getElementsByTagName('div');
+ for (var k = 0; k < math.length; k++)
+ {if (math[k].className.match(/(^| )math( |$)/)) {return true}}
+ math = obj.getElementsByTagName('span');
+ for (var k = 0; k < math.length; k++)
+ {if (math[k].className.match(/(^| )math( |$)/)) {return true}}
+ return false;
+ },
+
+ /*
+ * When math tags are found, load the jsMath.js file,
+ * and afterward, load any auxiliary files or fonts,
+ * and then do any pending commands.
+ */
+ LoadJsMath: function () {
+ if (this.loading) return;
+ if (jsMath.loaded) {this.afterLoad(); return}
+ if (this.root) {
+ this.loading = 1;
+ this.setMessage('Loading jsMath...');
+ this.Script.AfterLoad = this.afterLoad;
+ this.Script.Load('jsMath.js');
+ } else {
+ alert("Can't determine URL for jsMath.js");
+ }
+ },
+ afterLoad: function () {
+ jsMath.Autoload.loading = 0;
+ //
+ // Handle MSIE bug where jsMath.window both is and is not the actual window
+ //
+ if (jsMath.tex2math.window) {jsMath.tex2math.window.jsMath = jsMath}
+ if (jsMath.browser == 'MSIE') {window.onscroll = jsMath.window.onscroll};
+ var fonts = jsMath.Autoload.loadFonts;
+ if (fonts) {
+ if (typeof(fonts) != 'object') {fonts = [fonts]}
+ for (var i = 0; i < fonts.length; i++) {jsMath.Font.Load(fonts[i])}
+ }
+ var files = jsMath.Autoload.loadFiles;
+ if (files) {
+ if (typeof(files) != 'object') {files = [files]}
+ for (var i = 0; i < files.length; i++) {jsMath.Setup.Script(files[i])}
+ }
+ var macros = jsMath.Autoload.macros;
+ if (macros) {
+ for (var id in macros) {
+ if (typeof(macros[id]) == 'string') {
+ jsMath.Macro(id,macros[id]);
+ } else {
+ jsMath.Macro(id,macros[id][0],macros[id][1]);
+ }
+ }
+ }
+ jsMath.Synchronize(function () {jsMath.Autoload.Script.RunStack()});
+ jsMath.Autoload.setMessage();
+ },
+
+ /*
+ * Display a message in a small box at the bottom of the screen
+ */
+ setMessage: function (message) {
+ if (message) {
+ this.div = document.createElement('div');
+ if (!document.body.hasChildNodes) {document.body.appendChild(this.div)}
+ else {document.body.insertBefore(this.div,document.body.firstChild)}
+ var style = {
+ position:'fixed', bottom:'1px', left:'2px',
+ backgroundColor:'#E6E6E6', border:'solid 1px #959595',
+ margin:'0px', padding:'1px 8px', zIndex:102,
+ color:'black', fontSize:'75%', width:'auto'
+ };
+ for (var id in style) {this.div.style[id] = style[id]}
+ this.div.id = "jsMath_message";
+ this.div.appendChild(jsMath.document.createTextNode(message));
+ } else if (this.div) {
+ this.div.firstChild.nodeValue = "";
+ this.div.style.visibility = 'hidden';
+ }
+ },
+
+ /*
+ * Queue these so we can do them after jsMath has been loaded
+ */
+ stubs: {
+ Process: function (data) {jsMath.Autoload.Script.Push('Process',[data])},
+ ProcessBeforeShowing: function (data) {jsMath.Autoload.Script.Push('ProcessBeforeShowing',[data])},
+ ProcessElement: function (data) {jsMath.Autoload.Script.Push('ProcessElement',[data])},
+ ConvertTeX: function (data) {jsMath.Autoload.Script.Push('ConvertTeX',[data])},
+ ConvertTeX2: function (data) {jsMath.Autoload.Script.Push('ConvertTeX2',[data])},
+ ConvertLaTeX: function (data) {jsMath.Autoload.Script.Push('ConvertLaTeX',[data])},
+ ConvertCustom: function (data) {jsMath.Autoload.Script.Push('ConvertCustom',[data])},
+ CustomSearch: function (d1,d2,d3,d4) {jsMath.Autoload.Script.Push('CustomSearch',[d1,d2,d3,d4])},
+ Synchronize: function (data) {jsMath.Autoload.Script.Push('Synchronize',[data])},
+ Macro: function (cs,def,params) {jsMath.Autoload.Script.Push('Macro',[cs,def,params])}
+ },
+
+ InitStubs: function () {jsMath.Add(jsMath,jsMath.Autoload.stubs)}
+
+});
+
+/*
+ * Initialize
+ */
+
+if (jsMath.Autoload.findTeXstrings == null) {jsMath.Autoload.findTeXstrings = 0}
+if (jsMath.Autoload.findLaTeXstrings == null) {jsMath.Autoload.findLaTeXstrings = 0}
+
+jsMath.Autoload.Script.Init();
+jsMath.Autoload.InitStubs();
+if (document.body && !jsMath.Autoload.delayCheck) {jsMath.Autoload.Check()}