mirror of
https://github.com/kovidgoyal/calibre.git
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206 lines
7.9 KiB
JavaScript
206 lines
7.9 KiB
JavaScript
/*************************************************************
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*
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* MathJax/extensions/mml2jax.js
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*
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* Implements the MathML to Jax preprocessor that locates <math> nodes
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* within the text of a document and replaces them with SCRIPT tags
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* for processing by MathJax.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2010-2012 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.mml2jax = {
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version: "2.0",
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config: {
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preview: "alttext" // Use the <math> element's alttext as the
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// preview. Set to "none" for no preview,
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// or set to an array specifying an HTML snippet
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// to use a fixed preview for all math
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},
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MMLnamespace: "http://www.w3.org/1998/Math/MathML",
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PreProcess: function (element) {
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if (!this.configured) {
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this.config = MathJax.Hub.CombineConfig("mml2jax",this.config);
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if (this.config.Augment) {MathJax.Hub.Insert(this,this.config.Augment)}
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this.InitBrowser();
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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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//
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// Handle all math tags with no namespaces
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//
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this.ProcessMathArray(element.getElementsByTagName("math"));
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//
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// Handle math with namespaces in XHTML
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//
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if (element.getElementsByTagNameNS)
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{this.ProcessMathArray(element.getElementsByTagNameNS(this.MMLnamespace,"math"))}
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//
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// Handle math with namespaces in HTML
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//
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var i, m;
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if (document.namespaces) {
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//
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// IE namespaces are listed in document.namespaces
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//
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for (i = 0, m = document.namespaces.length; i < m; i++) {
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var ns = document.namespaces[i];
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if (ns.urn === this.MMLnamespace)
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{this.ProcessMathArray(element.getElementsByTagName(ns.name+":math"))}
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}
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} else {
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//
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// Everybody else
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//
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var html = document.getElementsByTagName("html")[0];
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if (html) {
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for (i = 0, m = html.attributes.length; i < m; i++) {
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var attr = html.attributes[i];
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if (attr.nodeName.substr(0,6) === "xmlns:" && attr.nodeValue === this.MMLnamespace)
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{this.ProcessMathArray(element.getElementsByTagName(attr.nodeName.substr(6)+":math"))}
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}
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}
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}
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},
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ProcessMathArray: function (math) {
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var i;
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if (math.length) {
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if (this.MathTagBug) {
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for (i = math.length-1; i >= 0; i--) {
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if (math[i].nodeName === "MATH") {this.ProcessMathFlattened(math[i])}
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else {this.ProcessMath(math[i])}
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}
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} else {
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for (i = math.length-1; i >= 0; i--) {this.ProcessMath(math[i])}
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}
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}
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},
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ProcessMath: function (math) {
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var parent = math.parentNode;
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var script = document.createElement("script");
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script.type = "math/mml";
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parent.insertBefore(script,math);
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if (this.AttributeBug) {
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var html = this.OuterHTML(math);
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if (this.CleanupHTML) {
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html = html.replace(/<\?import .*?>/i,"").replace(/<\?xml:namespace .*?\/>/i,"");
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html = html.replace(/ /g," ");
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}
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MathJax.HTML.setScript(script,html); parent.removeChild(math);
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} else {
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var span = MathJax.HTML.Element("span"); span.appendChild(math);
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MathJax.HTML.setScript(script,span.innerHTML);
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}
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if (this.config.preview !== "none") {this.createPreview(math,script)}
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},
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ProcessMathFlattened: function (math) {
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var parent = math.parentNode;
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var script = document.createElement("script");
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script.type = "math/mml";
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parent.insertBefore(script,math);
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var mml = "", node, MATH = math;
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while (math && math.nodeName !== "/MATH") {
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node = math; math = math.nextSibling;
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mml += this.NodeHTML(node);
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node.parentNode.removeChild(node);
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}
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if (math && math.nodeName === "/MATH") {math.parentNode.removeChild(math)}
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script.text = mml + "</math>";
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if (this.config.preview !== "none") {this.createPreview(MATH,script)}
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},
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NodeHTML: function (node) {
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var html, i, m;
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if (node.nodeName === "#text") {
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html = this.quoteHTML(node.nodeValue);
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} else if (node.nodeName === "#comment") {
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html = "<!--" + node.nodeValue + "-->"
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} else {
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// In IE, outerHTML doesn't properly quote attributes, so quote them by hand
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// In Opera, HTML special characters aren't quoted in attributes, so quote them
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html = "<"+node.nodeName.toLowerCase();
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for (i = 0, m = node.attributes.length; i < m; i++) {
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var attribute = node.attributes[i];
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if (attribute.specified) {
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// Opera 11.5 beta turns xmlns into xmlns:xmlns, so put it back (*** check after 11.5 is out ***)
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html += " "+attribute.nodeName.toLowerCase().replace(/xmlns:xmlns/,"xmlns")+"=";
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var value = attribute.nodeValue; // IE < 8 doesn't properly set style by setAttributes
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if (value == null && attribute.nodeName === "style" && node.style) {value = node.style.cssText}
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html += '"'+this.quoteHTML(value)+'"';
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}
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}
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html += ">";
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// Handle internal HTML (possibly due to <semantics> annotation or missing </math>)
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if (node.outerHTML != null && node.outerHTML.match(/(.<\/[A-Z]+>|\/>)$/)) {
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for (i = 0, m = node.childNodes.length; i < m; i++)
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{html += this.OuterHTML(node.childNodes[i])}
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html += "</"+node.nodeName.toLowerCase()+">";
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}
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}
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return html;
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},
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OuterHTML: function (node) {
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if (node.nodeName.charAt(0) === "#") {return this.NodeHTML(node)}
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if (!this.AttributeBug) {return node.outerHTML}
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var html = this.NodeHTML(node);
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for (var i = 0, m = node.childNodes.length; i < m; i++)
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{html += this.OuterHTML(node.childNodes[i]);}
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html += "</"+node.nodeName.toLowerCase()+">";
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return html;
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},
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quoteHTML: function (string) {
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if (string == null) {string = ""}
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return string.replace(/&/g,"&").replace(/</g,"<").replace(/>/g,">").replace(/"/g,""");
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},
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createPreview: function (math,script) {
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var preview;
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if (this.config.preview === "alttext") {
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var text = math.getAttribute("alttext");
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if (text != null) {preview = [this.filterPreview(text)]}
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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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script.parentNode.insertBefore(preview,script);
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}
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},
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filterPreview: function (text) {return text},
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InitBrowser: function () {
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var test = MathJax.HTML.Element("span",{id:"<", className: "mathjax", innerHTML: "<math><mi>x</mi><mspace /></math>"});
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var html = test.outerHTML || "";
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this.AttributeBug = html !== "" && !(
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html.match(/id="<"/) && // "<" should convert to "<"
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html.match(/class="mathjax"/) && // IE leaves out quotes
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html.match(/<\/math>/) // Opera 9 drops tags after self-closing tags
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);
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this.MathTagBug = test.childNodes.length > 1; // IE < 9 flattens unknown tags
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this.CleanupHTML = MathJax.Hub.Browser.isMSIE; // remove namespace and other added tags
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}
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};
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MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.mml2jax]);
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MathJax.Ajax.loadComplete("[MathJax]/extensions/mml2jax.js");
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