862 lines
30 KiB
JavaScript
862 lines
30 KiB
JavaScript
/*********************************************************************
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*
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* mj-page-svg.js
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*
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* Implements an API to MathJax in node.js so that MathJax can be
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* used server-side to generate SVG, MathML, or images (the latter
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* requires an external library, batik, to do the svg to png
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* conversion). This API accepts HTML snippets that have their
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* math content converted to SVG's.
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*
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* ----------------------------------------------------------------------
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*
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* Copyright (c) 2014 The MathJax Consortium
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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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var http = require('http');
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var fs = require('fs');
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var path = require('path');
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var url = require('url');
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var fmt = require('util').format;
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var jsdom = require("jsdom").jsdom;
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var execFile = require('child_process').execFile;
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var speech = require('speech-rule-engine');
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var os = require('os');
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var displayMessages = false; // don't log Message.Set() calls
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var displayErrors = true; // show error messages on the console
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var undefinedChar = false; // unknown characters are not saved in the error array
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var extensions = ''; // no additional extensions used
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var defaults = {
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ex: 6, // ex-size in pixels
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width: 100, // width of container (in ex) for linebreaking and tags
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useFontCache: true, // use <defs> and <use> in svg output?
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useGlobalCache: true, // use common <defs> for all equations?
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linebreaks: false, // do linebreaking?
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equationNumbers: "none", // or "AMS" or "all"
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singleDollars: true, // allow single-dollar delimiter for inline TeX?
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html: "", // the HTML snippet to process
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xmlns: "mml", // the namespace to use for MathML
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inputs: ["AsciiMath","TeX","MathML"], // the inputs formats to support
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renderer: "SVG", // the output format
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// ("SVG", "NativeMML", "IMG", "PNG", or "None")
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dpi: 144, // dpi for png image
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addPreview: false, // turn turn into a MathJax preview, and keep the jax
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removeJax: true, // remove MathJax <script> tags?
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speakText: false, // add spoken annotations to svg output?
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speakRuleset: "mathspeak", // set speech ruleset (default (chromevox rules), mathspeak)
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speakStyle: "default", // set speech style (mathspeak: default, brief, sbrief)
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timeout: 60 * 1000, // 60 second timeout before restarting MathJax
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};
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//
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// The MathJax server states
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//
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var STATE = {
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STOPPED: 1, // no DOM or MathJax available
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STARTED: 2, // DOM loaded, MathJax starting up
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READY: 3, // MathJax initialized and ready to process math
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BUSY: 4 // MathJax currently processing math
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};
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//
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// The MathJaxPath is normaized against file:/// so that Windows paths are correct
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//
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var MathJaxPath = url.resolve("file:///","file:"+require.resolve('MathJax/unpacked/MathJax'));
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var BatikRasterizerPath = path.resolve(__dirname,'..','batik/batik-rasterizer.jar');
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var MathJaxConfig; // configuration for when starting MathJax
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var MathJax; // filled in once MathJax is loaded
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var serverState = STATE.STOPPED; // nothing loaded yet
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var timer; // used to reset MathJax if it runs too long
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var tmpfile = os.tmpdir() + "/mj-single-svg" + process.pid; // file name prefix to use for temp files
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var document, window, content, html; // the DOM elements
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var queue = []; // queue of typesetting requests of the form [data,callback]
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var data, callback; // the current queue item
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var errors = []; // errors collected durring the typesetting
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var SELECTOR = {
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TeX: ["math/tex","math/tex; mode=display"],
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MathML: ["math/mml"],
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AsciiMath: ["math/asciimath"]
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};
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var STYLES; // filled in when SVG is loaded
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/********************************************************************/
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//
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// Create the DOM window and set up the console wtihin it
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// Add an error handler to trap unexpected errors (requires
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// modifying jsdom)
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// Add a <div> where we can put the math to be typeset
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// and typeset math in the three formats we use (to force
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// the jax to be loaded completely)
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//
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function GetWindow() {
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document = jsdom();
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html = document.firstChild;
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window = document.defaultView;
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window.console = console;
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window.onerror = function (err,url,line) {AddError("Error: "+err)}
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content = document.body.appendChild(document.createElement("div"));
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content.id = "MathJax_Content";
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content.innerHTML = "$x$ `x` <math><mi>x</mi></math>";
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//
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// Node's url.resolve() has a problem with resolving a file:// URL when
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// the base URL is "about:blank", so force it to be something else (HACK)
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// since jsdom 3.x sets the base to "about:blank".
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//
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if (document._URL === "about:blank") document._URL = "file:///blank.html";
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}
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//
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// Set up a Mathjax configuration within the window
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//
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function ConfigureMathJax() {
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window.MathJax = {
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//
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// Load all input jax and preprocessors
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// Load AMS extensions and the autoload extension for TeX
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// Allow $...$ delimiters and don't create previews for any preprocessor,
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// Create stand-alone SVG elements with font caches by default
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// (users can override that)
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//
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jax: ["input/TeX", "input/MathML", "input/AsciiMath", "output/SVG", "output/NativeMML"],
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extensions: ["tex2jax.js","mml2jax.js","asciimath2jax.js","toMathML.js"],
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TeX: {extensions: window.Array("AMSmath.js","AMSsymbols.js","autoload-all.js")},
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tex2jax: {inlineMath: [['$','$'],['\\(','\\)']], preview:"none"},
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mml2jax: {preview:"none"},
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asciimath2jax: {preview:"none"},
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SVG: {useFontCache: true, useGlobalCache: false, EqnChunk: 1000000, EqnDelay: 0},
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//
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// This gets run before MathJax queues any actions
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//
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AuthorInit: function () {
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MathJax = window.MathJax;
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delete MathJax.Hub.config.styles; // don't need any styles
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MathJax.Hub.Startup.MenuZoom = function () {}; // don't load menu or zoom code
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MathJax.Extension.MathEvents = {
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Event:{}, Touch:{}, Hover:{} // fake structure to avid errors
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};
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MathJax.Ajax.loaded[MathJax.Ajax.fileURL("[MathJax]/extensions/MathEvents.js")] = true;
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//
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// When creating stylesheets, no need to wait for them
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// to become active, so just do the callback
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//
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MathJax.Ajax.timer.create = function (callback,node) {
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callback = MathJax.Callback(callback);
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callback(this.STATUS.OK);
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return callback;
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};
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//
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// Use the console for messages, if we are requesting them
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//
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MathJax.Message.Set = function (text,n,delay) {
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if (displayMessages && n !== 0) {
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if (text instanceof window.Array)
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{text = MathJax.Localization._.apply(MathJax.Localization,text)}
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console.error(text);
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}
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};
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MathJax.Message.Clear = function () {};
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MathJax.Message.Remove = function () {};
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MathJax.Message.Init = function () {};
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//
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// Trap Math Processing Errors
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//
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MathJax.Hub.Register.MessageHook("Math Processing Error",function (message) {
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AddError("Math Processing Error",message[2].message);
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});
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MathJax.Hub.Register.MessageHook("SVG Jax - unknown char",function (message) {
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AddError("Unknown character","U+"+message[1].toString(16).toUpperCase()+
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" in "+(message[2].fonts||["unknown"]).join(","),!undefinedChar);
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});
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MathJax.Hub.Register.MessageHook("MathML Jax - unknown node type",function (message) {
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AddError("MathML unknown node type",message[1]);
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});
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MathJax.Hub.Register.MessageHook("MathML Jax - parse error",function (message) {
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AddError("MathML",message[1]);
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});
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MathJax.Hub.Register.MessageHook("AsciiMath Jax - parse error",function (message) {
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AddError("AsciiMath parse error",message[1]);
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});
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MathJax.Hub.Register.MessageHook("TeX Jax - parse error",function (message) {
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AddError("TeX parse error",message[1]);
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});
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//
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// Set the delays to 0 (we don't need to update the screen)
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//
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MathJax.Hub.processSectionDelay = 0;
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MathJax.Hub.processUpdateTime = 10000000; // don't interrupt processing of output
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MathJax.Hub.processUpdateDelay = 0;
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//
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// Adjust the SVG output jax
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//
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MathJax.Hub.Register.StartupHook("SVG Jax Config",function () {
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var SVG = MathJax.OutputJax.SVG, HTML = MathJax.HTML;
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//
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// Don't need the styles
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//
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STYLES = SVG.config.styles;
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delete STYLES["#MathJax_SVG_Tooltip"];
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delete STYLES[".MathJax_SVG_Processing"];
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delete STYLES[".MathJax_SVG_Processed"];
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delete STYLES[".MathJax_SVG_ExBox"];
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STYLES = MathJax.Ajax.StyleString(STYLES);
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delete SVG.config.styles
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SVG.Augment({
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//
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// Set up the default ex-size and width
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//
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InitializeSVG: function () {
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this.defaultEx = 6;
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this.defaultWidth = 100;
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},
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//
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// Adjust preTranslate() to not try to find the ex-size or
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// the container widths.
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//
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preTranslate: function (state) {
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var scripts = state.jax[this.id], i, m = scripts.length,
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script, prev, span, div, jax, ex, em,
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maxwidth = 100000, relwidth = false, cwidth,
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linebreak = this.config.linebreaks.automatic,
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width = this.config.linebreaks.width;
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//
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// Loop through the scripts
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//
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for (i = 0; i < m; i++) {
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script = scripts[i]; if (!script.parentNode) continue;
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//
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// Remove any existing output
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//
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prev = script.previousSibling;
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if (prev && String(prev.className).match(/^MathJax(_SVG)?(_Display)?( MathJax(_SVG)?_Processing)?$/))
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{prev.parentNode.removeChild(prev)}
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//
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// Add the span, and a div if in display mode,
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// then set the role and mark it as being processed
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//
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jax = script.MathJax.elementJax; if (!jax) continue;
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jax.SVG = {display: (jax.root.Get("display") === "block")}
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span = div = HTML.Element("span",{
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style: {"font-size": this.config.scale+"%", display:"inline-block"},
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className:"MathJax_SVG", id:jax.inputID+"-Frame", isMathJax:true, jaxID:this.id
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});
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if (jax.SVG.display) {
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div = HTML.Element("div",{className:"MathJax_SVG_Display"});
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div.appendChild(span);
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}
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//
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// Mark math for screen readers
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// (screen readers don't know about role="math" yet, so use "textbox" instead)
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//
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div.setAttribute("role","textbox"); div.setAttribute("aria-readonly","true");
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div.className += " MathJax_SVG_Processing";
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script.parentNode.insertBefore(div,script);
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//
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// Set SVG data for jax
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//
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jax.SVG.ex = ex = (data||defaults).ex;
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jax.SVG.em = em = ex / SVG.TeX.x_height * 1000; // scale ex to x_height
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jax.SVG.cwidth = width / em * 1000;
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jax.SVG.lineWidth = (linebreak ? width / em *1000 : SVG.BIGDIMEN);
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}
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//
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// Set state variables used for displaying equations in chunks
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//
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state.SVGeqn = state.SVGlast = 0; state.SVGi = -1;
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state.SVGchunk = this.config.EqnChunk;
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state.SVGdelay = false;
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}
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});
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//
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// TEXT boxes use getBBox, which isn't implemented, so
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// use a monspace font and fake the size. Since these
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// are used only for error messages and undefined characters,
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// this should be good enough for now.
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//
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SVG.BBOX.TEXT.Augment({
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Init: function (scale,text,def) {
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if (!def) {def = {}}; def.stroke = "none";
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this.SUPER(arguments).Init.call(this,def);
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SVG.addText(this.element,text);
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var bbox = {width: text.length * 8.5, height: 18, y: -12};
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scale *= 1000/SVG.em;
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this.element.setAttribute("style","font-family: monospace");
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this.element.setAttribute("transform","scale("+scale+") matrix(1 0 0 -1 0 0)");
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this.w = this.r = bbox.width*scale; this.l = 0;
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this.h = this.H = -bbox.y*scale;
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this.d = this.D = (bbox.height + bbox.y)*scale;
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}
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});
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});
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//
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// A dummy output jax that does nothing (no output).
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//
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MathJax.OutputJax.None = MathJax.OutputJax({
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id: "None",
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version: "1.0",
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directory: MathJax.OutputJax.directory+"/None",
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preProcess: function () {},
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Process: function () {},
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postProcess: function () {}
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});
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MathJax.Ajax.loaded[MathJax.Ajax.fileURL(MathJax.OutputJax.directory+"/None/config.js")] = 1;
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MathJax.Ajax.loaded[MathJax.Ajax.fileURL(MathJax.OutputJax.directory+"/None/jax.js")] = 1;
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//
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// Start the typesetting queue when MathJax is ready
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//
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MathJax.Hub.Register.StartupHook("End",function () {
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MathJax.OutputJax.None.Register("jax/mml");
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if (!MathJax.Hub.config.menuSettings.semantics) {
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MathJax.Hub.Register.StartupHook("TeX Jax Ready", function () {
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MathJax.InputJax.TeX.annotationEncoding = null;
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});
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MathJax.Hub.Register.StartupHook("AsciiMath Jax Ready", function () {
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MathJax.InputJax.AsciiMath.annotationEncoding = null;
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});
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}
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serverState = STATE.READY;
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MathJax.Hub.Queue(StartQueue);
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});
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}
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};
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if (extensions) {
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//
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// Parse added extensions list and add to standard ones
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//
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var extensionList = extensions.split(/s*,\s*/);
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for (var i = 0; i < extensionList.length; i++) {
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var matches = extensionList[i].match(/^(.*?)(\.js)?$/);
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window.MathJax.extensions.push(matches[1] + '.js');
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}
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}
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//
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// Turn arrays into jsdom window arrays
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// (so "instanceof Array" will identify them properly)
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//
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var adjustArrays = function (obj) {
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for (var id in obj) {if (obj.hasOwnProperty(id)) {
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if (obj[id] instanceof Array) {
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var A = window.Array();
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obj[id] = A.concat.apply(A,obj[id]);
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} else if (typeof obj[id] === "object") {
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adjustArrays(obj[id]);
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}
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}}
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}
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if (MathJaxConfig) {
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adjustArrays(MathJaxConfig);
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Insert(window.MathJax,MathJaxConfig);
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}
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}
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//
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// Insert one objects into another
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//
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function Insert(dst,src) {
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for (var id in src) {if (src.hasOwnProperty(id)) {
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// allow for concatenation of arrays?
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if (typeof src[id] === 'object' && !(src[id] instanceof Array) &&
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(typeof dst[id] === 'object' || typeof dst[id] === 'function'))
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{Insert(dst[id],src[id])} else {dst[id] = src[id]}
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}}
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return dst;
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}
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//
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// Load MathJax into the DOM
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//
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function StartMathJax() {
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serverState = STATE.STARTED;
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var script = document.createElement("script");
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script.src = MathJaxPath;
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script.onerror = function () {AddError("Can't load MathJax.js from "+MathJaxPath)}
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document.head.appendChild(script);
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}
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/********************************************************************/
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//
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// Return an error value (and report it to console)
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//
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function ReportError(message,currentCallback) {
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AddError(message);
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(currentCallback||callback)({errors: errors});
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}
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//
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// Add an error to the error list and display it on the console
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//
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function AddError(prefix,message,nopush) {
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if (message != null) {
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if (MathJax && MathJax.ElementJax) {
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var n = MathJax.ElementJax.ID + 1;
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if (prefix !== "") {prefix += " ("+n+"): "}
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}
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message = prefix+message;
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} else {
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message = prefix;
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}
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if (displayErrors) console.error(message);
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if (!nopush) errors.push(message);
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}
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/********************************************************************/
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//
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// A bug in jsdom prevents explicit width and height from being
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// kept in the style information, so work around that.
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// WARNING: this depends on the internals of jsdom, and may need
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// to be adjusted in the future.
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//
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function SetWH(node,w,h) {
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if (!node.style.width) {
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var style = node.style;
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style[style._length] = "width"; style._length++; style._values.width = w;
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style[style._length] = "height"; style._length++; style._values.height = h;
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}
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}
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/********************************************************************/
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//
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// Start typesetting the queued expressions
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//
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function StartQueue() {
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data = callback = null; // clear existing equation, if any
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errors = []; // clear any errors
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if (!queue.length) return // return if nothing to do
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serverState = STATE.BUSY;
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var result = {}, $$ = window.Array, HUB = MathJax.Hub;
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//
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// Get the math data and callback and set the content
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//
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var item = queue.shift();
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data = item[0]; callback = item[1];
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content.innerHTML = data.html; // %%% disable <script> tags?
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html.setAttribute("xmlns:"+data.xmlns,"http://www.w3.org/1998/Math/MathML");
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//
|
|
// Initialize speech engine
|
|
//
|
|
if (data.speakText)
|
|
speech.setupEngine({semantics:true, domain:data.speakRuleset, style:data.speakStyle});
|
|
|
|
//
|
|
// Set up MathJax
|
|
//
|
|
ConfigureTypeset();
|
|
|
|
//
|
|
// Set up a timeout timer to restart MathJax if it runs too long,
|
|
// Then push the functions to set the renderer, perform the typesetting,
|
|
// and process the results.
|
|
//
|
|
timer = setTimeout(RestartMathJax,data.timeout);
|
|
HUB.Queue(
|
|
$$(SetRenderer,data.renderer),
|
|
$$("Typeset",HUB),
|
|
$$(TypesetDone),
|
|
$$(AdjustSVG),
|
|
$$(AdjustMML),
|
|
$$(MakeIMG),
|
|
$$(MakePNG),
|
|
$$(MakePreviews),
|
|
$$(RemoveScripts),
|
|
$$(ReturnResults,result)
|
|
);
|
|
}
|
|
|
|
//
|
|
// Set the SVG and TeX parameters
|
|
// according to the requested data
|
|
//
|
|
function ConfigureTypeset() {
|
|
var SVG = MathJax.OutputJax.SVG,
|
|
TEX = MathJax.InputJax.TeX,
|
|
MML = MathJax.ElementJax.mml,
|
|
HUB = MathJax.Hub,
|
|
EXT = MathJax.Extension,
|
|
$$ = window.Array;
|
|
|
|
//
|
|
// Configure SVG and TeX
|
|
//
|
|
SVG.defaultEx = data.ex;
|
|
SVG.defaultWidth = data.width * data.ex;
|
|
SVG.config.linebreaks.automatic = data.linebreaks;
|
|
SVG.config.linebreaks.width = data.width * data.ex;
|
|
SVG.config.useFontCache = data.useFontCache;
|
|
SVG.config.useGlobalCache = data.useGlobalCache &&
|
|
data.renderer !== "IMG" && data.renderer !== "PNG";
|
|
TEX.config.equationNumbers.autoNumber = data.equationNumbers;
|
|
|
|
//
|
|
// Set the TeX delimiters
|
|
//
|
|
var delimiters = $$($$('$','$'),$$('\\(','\\)'));
|
|
if (!data.singleDollars) {delimiters.shift()}
|
|
HUB.Config({tex2jax: {inlineMath: delimiters}});
|
|
|
|
//
|
|
// Reset the MathJax counters for things
|
|
//
|
|
SVG.resetGlyphs(true);
|
|
TEX.resetEquationNumbers();
|
|
MML.SUPER.ID = 0;
|
|
|
|
//
|
|
// Register the preprocessors and get the jax selector
|
|
//
|
|
var INPUT = {
|
|
TeX: [$$("PreProcess",EXT.tex2jax)],
|
|
AsciiMath: [$$("PreProcess",EXT.asciimath2jax)],
|
|
MathML: [$$("PreProcess",EXT.mml2jax),5]
|
|
};
|
|
HUB.preProcessors.hooks = [];
|
|
for (var i = 0, m = data.inputs.length; i < m; i++) {
|
|
if (INPUT[data.inputs[i]]) HUB.Register.PreProcessor.apply(null,INPUT[data.inputs[i]]);
|
|
}
|
|
}
|
|
|
|
/********************************************************************/
|
|
|
|
//
|
|
// Set the MathJax renderer
|
|
//
|
|
function SetRenderer(renderer) {
|
|
if (renderer === "IMG" || renderer === "PNG") renderer = "SVG";
|
|
return MathJax.Hub.setRenderer(renderer);
|
|
}
|
|
|
|
//
|
|
// Clear the timeout and clean up
|
|
//
|
|
function TypesetDone() {
|
|
if (timer) {clearTimeout(timer); timer = null}
|
|
if (data.renderer === "None") {content.innerHTML = "<p></p>"}
|
|
html.removeAttribute("xmlns:"+data.xmlns);
|
|
}
|
|
|
|
//
|
|
// Clean up the SVG for use in a page without MathJax.
|
|
//
|
|
function AdjustSVG() {
|
|
var nodes, i, callback;
|
|
if (data.renderer === "SVG" || data.renderer === "IMG" || data.renderer === "PNG") {
|
|
//
|
|
// Fix missing xlink namespace on href's
|
|
//
|
|
nodes = document.querySelectorAll(".MathJax_SVG use[href]");
|
|
for (i = nodes.length-1; i >= 0; i--) {
|
|
nodes[i].setAttribute("xlink:href",nodes[i].getAttribute("href"));
|
|
nodes[i].removeAttribute("href");
|
|
}
|
|
//
|
|
// Fix incorrect roles
|
|
//
|
|
nodes = document.querySelectorAll(".MathJax_SVG[role=textbox], .MathJax_SVG_Display[role=textbox]");
|
|
for (i = nodes.length-1; i >= 0; i--) nodes[i].setAttribute("role","math");
|
|
//
|
|
// Fix a problem with jsdom not setting width and height CSS.
|
|
//
|
|
nodes = document.querySelectorAll(".MathJax_SVG > span > span");
|
|
for (i = nodes.length-1; i >= 0; i--) {
|
|
var child = nodes[i].firstChild;
|
|
SetWH(nodes[i],child.getAttribute("width"),child.getAttribute("height"));
|
|
}
|
|
//
|
|
// Add speech text, if needed
|
|
//
|
|
if (data.speakText) {callback = GetSpeech()}
|
|
}
|
|
if (data.renderer === "SVG") {
|
|
//
|
|
// Copy global SVG glyph defs into content
|
|
//
|
|
if (data.useGlobalCache) {
|
|
var defs = document.getElementById("MathJax_SVG_glyphs").parentNode.cloneNode(true);
|
|
defs.style.display = "none";
|
|
content.insertBefore(defs,content.firstChild);
|
|
}
|
|
//
|
|
// Add styles
|
|
//
|
|
var styles = document.createElement("style");
|
|
styles.innerHTML = STYLES;
|
|
styles.id="MathJax_SVG_styles";
|
|
content.insertBefore(styles,content.firstChild);
|
|
}
|
|
return callback;
|
|
}
|
|
|
|
//
|
|
// Add the speech text and mark the SVG appropriately
|
|
//
|
|
function GetSpeech() {
|
|
var nodes = document.querySelectorAll(".MathJax_SVG svg"), queue;
|
|
var SPEAK = function (svg) {
|
|
var jax = MathJax.Hub.getJaxFor(svg), id = jax.inputID, mml;
|
|
try {mml = jax.root.toMathML('',jax)} catch(err) {
|
|
if (!err.restart) {throw err;} // an actual error
|
|
if (!queue) {queue = MathJax.Callback.Queue()}
|
|
return queue.Push(err.restart,window.Array(SPEAK,svg));
|
|
}
|
|
jax.speech = speech.processExpression(mml);
|
|
svg.setAttribute("role","math");
|
|
svg.setAttribute("aria-labelledby",id+"-Title "+id+"-Desc");
|
|
for (var i = 0, m = svg.childNodes.length; i < m; i++)
|
|
svg.childNodes[i].setAttribute("aria-hidden",true);
|
|
var node = MathJax.HTML.Element("desc",{id:id+"-Desc"},[jax.speech]);
|
|
svg.insertBefore(node,svg.firstChild);
|
|
node = MathJax.HTML.Element("title",{id:id+"-Title"},["Equation"]);
|
|
svg.insertBefore(node,svg.firstChild);
|
|
}
|
|
for (var i = nodes.length-1; i >= 0; i--) SPEAK(nodes[i]);
|
|
if (queue) return queue.Push(function () {}); // wait for all the queue entries to finish
|
|
}
|
|
|
|
//
|
|
// Clean up the MathML for use in a page without MathJax.
|
|
//
|
|
function AdjustMML() {
|
|
if (data.renderer === "NativeMML") {
|
|
var nodes = document.getElementsByClassName("MathJax_MathML");
|
|
for (var i = nodes.length-1; i >= 0; i--) {
|
|
var math = nodes[i].getElementsByTagName("math")[0]
|
|
nodes[i].parentNode.replaceChild(math,nodes[i]);
|
|
if (data.speakText) math.setAttribute("alttext",speech.processExpression(math.outerHTML));
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Create IMG node and the associated data URL for the svg image
|
|
//
|
|
function MakeIMG() {
|
|
if (data.renderer === "IMG") {
|
|
var nodes = document.getElementsByClassName("MathJax_SVG");
|
|
for (var i = nodes.length-1; i >= 0; i--) {
|
|
var svg = nodes[i].getElementsByTagName("svg")[0];
|
|
var w = svg.getAttribute("width"), h = svg.getAttribute("height");
|
|
var css = svg.style.cssText+" width:"+w+"; height:"+h;
|
|
svg.style.cssText = ""; // this will be handled by the <img> tag instead
|
|
svg.setAttribute("xmlns","http://www.w3.org/2000/svg");
|
|
svg = svg.outerHTML.replace(/><([^/])/g,">\n<$1").replace(/(<\/[a-z]*>)(?=<\/)/g,"$1\n");
|
|
svg = new Buffer(svg).toString("base64"); // encode svg as base64
|
|
var img = MathJax.HTML.Element("img",{
|
|
src:"data:image/svg+xml;base64,"+svg, style:{cssText:css},
|
|
className: "MathJax_SVG_IMG",
|
|
});
|
|
SetWH(img,w,h); // work around jsdom bug with width and height CSS
|
|
if (data.speakText) img.setAttribute("alt",MathJax.Hub.getJaxFor(nodes[i]).speech);
|
|
nodes[i].parentNode.replaceChild(img,nodes[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Make PNG images and attach them to IMG tags
|
|
//
|
|
function MakePNG() {
|
|
if (data.renderer === "PNG") {
|
|
var synch = MathJax.Callback(function () {}); // for synchronization with MathJax
|
|
var batikCommands = ['-jar', BatikRasterizerPath, '-dpi', data.dpi, tmpfile + '.svg'];
|
|
var tmpSVG = tmpfile+".svg", tmpPNG = tmpfile+".png";
|
|
var nodes = document.getElementsByClassName("MathJax_SVG");
|
|
var check = function (err) {if (err) {AddError(err.message); return true}}
|
|
var PNG = function (i) {
|
|
if (i < 0) return synch(); // signal everything is done
|
|
var svg = nodes[i].getElementsByTagName("svg")[0];
|
|
var w = svg.getAttribute("width"), h = svg.getAttribute("height");
|
|
var css = svg.style.cssText+" width:"+w+"; height:"+h;
|
|
svg.style.cssText = ""; // this will be handled by the <img> tag instead
|
|
svg.setAttribute("xmlns","http://www.w3.org/2000/svg");
|
|
svg = [
|
|
'<?xml version="1.0" standalone="no"?>',
|
|
'<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">',
|
|
svg.outerHTML
|
|
].join("\n");
|
|
fs.writeFile(tmpSVG,svg,function (err) {
|
|
if (check(err)) return PNG(i-1);
|
|
execFile('java', batikCommands, function (err,stdout,stderr) {
|
|
if (check(err)) {fs.unlinkSync(tmpSVG); return PNG(i-1)}
|
|
fs.readFile(tmpPNG,null,function (err,buffer) {
|
|
if (!check(err)) {
|
|
var img = MathJax.HTML.Element("img",{
|
|
src:"data:image/png;base64,"+buffer.toString('base64'),
|
|
style:{cssText:css}, className: "MathJax_PNG_IMG",
|
|
});
|
|
SetWH(img,w,h); // work around jsdom bug with width and height CSS
|
|
if (data.speakText) img.setAttribute("alt",MathJax.Hub.getJaxFor(nodes[i]).speech);
|
|
nodes[i].parentNode.replaceChild(img,nodes[i]);
|
|
}
|
|
fs.unlinkSync(tmpSVG); fs.unlinkSync(tmpPNG);
|
|
PNG(i-1);
|
|
});
|
|
});
|
|
});
|
|
}
|
|
PNG(nodes.length-1);
|
|
}
|
|
return synch;
|
|
}
|
|
|
|
//
|
|
// Move the MathJax output to a MathJax_Preview node preceeding the
|
|
// node's script element, and remove any previous preview.
|
|
// Remove the ID's so that they dont' confuse MathJax when it
|
|
// re-processes the math on the page.
|
|
//
|
|
function MakePreviews() {
|
|
if (data.addPreview) {
|
|
var jax = MathJax.Hub.getAllJax();
|
|
for (var i = jax.length-1; i >= 0; i--) {
|
|
var script = jax[i].SourceElement(); script.removeAttribute("id");
|
|
var frame = script.previousSibling;
|
|
frame.removeAttribute("id"); frame.firstChild.removeAttribute("id");
|
|
var type = (frame.nodeName.toLowerCase() === "div" ||
|
|
frame.getAttribute("display") === "block" ? "div" : "span");
|
|
var preview = MathJax.HTML.Element(type,{className:"MathJax_Preview"});
|
|
preview.appendChild(frame);
|
|
if (script.previousSibling && script.previousSibling.className === "MathJax_Preview")
|
|
script.parentNode.removeChild(script.previousSibling);
|
|
script.parentNode.insertBefore(preview,script);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Remove the MathJax <script> tags
|
|
//
|
|
function RemoveScripts() {
|
|
if (data.removeJax && !data.addPreview) {
|
|
var HUB = MathJax.Hub, jax = HUB.getAllJax();
|
|
for (var i = jax.length-1; i >= 0; i--) {
|
|
var node = jax[i].SourceElement();
|
|
node.parentNode.removeChild(node);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Get the resulting HTML and return it
|
|
//
|
|
function ReturnResults(result) {
|
|
result.html = content.innerHTML;
|
|
if (errors.length) {result.errors = errors}
|
|
callback(result);
|
|
serverState = STATE.READY;
|
|
StartQueue();
|
|
}
|
|
|
|
/********************************************************************/
|
|
|
|
//
|
|
// If MathJax times out, discard the DOM
|
|
// and load a new one (get a fresh MathJax)
|
|
//
|
|
function RestartMathJax() {
|
|
if (timer) {
|
|
MathJax.Hub.queue.queue = []; // clear MathJax queue, so pending operations won't fire
|
|
MathJax = timer = window = document = html = content = null;
|
|
ReportError("Timeout waiting for MathJax: restarting");
|
|
serverState = STATE.STOPPED;
|
|
}
|
|
GetWindow();
|
|
ConfigureMathJax();
|
|
StartMathJax();
|
|
}
|
|
|
|
/********************************************************************/
|
|
|
|
//
|
|
// The API call to typeset a page
|
|
//
|
|
// %%% check data for correctness
|
|
//
|
|
exports.typeset = function (data,callback) {
|
|
if (!callback || typeof(callback) !== "function") {
|
|
if (displayErrors) console.error("Missing callback");
|
|
return;
|
|
}
|
|
var options = {};
|
|
for (var id in defaults) {if (defaults.hasOwnProperty(id)) {
|
|
options[id] = (data.hasOwnProperty(id) ? data[id]: defaults[id]);
|
|
}}
|
|
queue.push([options,callback]);
|
|
if (serverState == STATE.STOPPED) {RestartMathJax()}
|
|
if (serverState == STATE.READY) StartQueue();
|
|
}
|
|
|
|
//
|
|
// Manually start MathJax (this is done automatically
|
|
// when the first typeset() call is made)
|
|
//
|
|
exports.start = function () {RestartMathJax()}
|
|
|
|
//
|
|
// Configure MathJax and the API
|
|
// You can pass additional configuration options to MathJax using the
|
|
// MathJax property, and can set displayErrors and displayMessages
|
|
// that control the display of error messages, and extensions to add
|
|
// additional MathJax extensions to the base or to sub-categories.
|
|
//
|
|
// E.g.
|
|
// mjAPI.config({
|
|
// MathJax: {SVG: {font: "STIX-Web"}},
|
|
// displayErrors: false
|
|
// extensions: 'Safe,TeX/noUndefined'
|
|
// });
|
|
//
|
|
exports.config = function (config) {
|
|
if (config.displayMessages != null) {displayMessages = config.displayMessages}
|
|
if (config.displayErrors != null) {displayErrors = config.displayErrors}
|
|
if (config.undefinedCharError != null) {undefinedChar = config.undefinedCharError}
|
|
if (config.extensions != null) {extensions = config.extensions}
|
|
if (config.MathJax) {MathJaxConfig = config.MathJax}
|
|
}
|