611 lines
21 KiB
JavaScript
611 lines
21 KiB
JavaScript
/*********************************************************************
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*
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* mj-single-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 converts single math expressions to SVG,
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* will giving control over the input format, the font caching, and
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* a number of other features.
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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 fmt = require('util').format;
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var jsdom = require('jsdom').jsdom;
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var exec = require('child_process').exec;
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var speech = require('speech-rule-engine');
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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 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: false, // 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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math: "", // the math to typeset
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format: "TeX", // the input format (TeX, inline-TeX, AsciiMath, or MathML)
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xmlns: "mml", // the namespace to use for MathML
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mml: false, // return mml output?
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svg: false, // return svg output?
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img: false, // return img tag for remote image?
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png: false, // return png image (as data: URL)?
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dpi: 144, // dpi for png image
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speakText: false, // add spoken annotations to svg output?
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timeout: 5 * 1000, // 5 second timeout before restarting MathJax
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};
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var MathJaxPath = "file://"+path.resolve(__dirname,'..','mathjax/unpacked/MathJax.js');
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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 serverStarted = false; // true when the MathJax DOM has been created
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var serverReady = false; // true when MathJax has done its initial typeset (loaded all components)
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var timer; // used to reset MathJax if it runs too long
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var tmpfile = "/tmp/mj-single-svg"; // 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 ID = 0; // id for this SVG element
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//
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// The delimiters used for each of the input formats
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//
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var delimiters = {
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TeX: ["$$","$$"],
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"inline-TeX": ["$","$"],
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AsciiMath: ["`","`"],
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MathML: ["",""]
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};
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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.parentWindow;
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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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//
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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"],
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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},
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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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//
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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("SVG - 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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// 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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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; jax.SVG.cwidth = width;
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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.lineWidth = (linebreak ? width / em : 1000000);
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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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// Start the typesetting queue when MathJax is ready
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// (reseting the counters so that the initial math doesn't affect them)
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//
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MathJax.Hub.Register.StartupHook("End",function () {
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MathJax.OutputJax.SVG.resetGlyphs(true);
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MathJax.ElementJax.mml.ID = 0;
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serverReady = true;
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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 (MathJaxConfig) {Insert(window.MathJax,MathJaxConfig)}
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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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var script = document.createElement("script");
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script.src = 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(message,nopush) {
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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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// Creates the MathML output (taking MathJax resets
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// into account)
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//
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function GetMML(result) {
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if (!data.mml && !data.speakText) return;
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var mml, jax = MathJax.Hub.getAllJax()[0];
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try {result.mml = jax.root.toMathML('',jax)} catch(err) {
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if (!err.restart) {throw err;} // an actual error
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return MathJax.Callback.After(window.Array(GetMML,result),err.restart);
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}
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}
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//
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// Create SVG output and PNG output, if requested
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//
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function GetSVG(result) {
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if (!data.svg && !data.png && !data.img) return;
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var jax = MathJax.Hub.getAllJax()[0]; if (!jax) return;
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var script = jax.SourceElement(),
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svg = script.previousSibling.getElementsByTagName("svg")[0];
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svg.setAttribute("xmlns","http://www.w3.org/2000/svg");
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//
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// Add the speech elements, if needed
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//
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if (data.speakText) {
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GetSpeech(svg,result.mml);
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if (!data.mml) {delete result.mml}
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}
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//
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// SVG data is modified to add linebreaks for readability,
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// and to put back the xlink namespace that is removed in HTML5
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//
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var svgdata = svg.outerHTML.replace(/><([^/])/g,">\n<$1")
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.replace(/(<\/[a-z]*>)(?=<\/)/g,"$1\n")
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.replace(/(<use [^>]*)(href=)/g,' $1xlink:$2');
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//
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// The file version includes the xml and DOCTYPE comments
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//
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var svgfile = [
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'<?xml version="1.0" standalone="no"?>',
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'<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">',
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svgdata
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].join("\n");
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//
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// Add the requested data to the results
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//
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if (data.svg) {result.svg = svgdata}
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if (data.img) {
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if (data.svg) result.svg = svgfile;
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result.img = '<img src="file.svg" style="'+svg.style.cssText+
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" width:"+svg.getAttribute("width")+"; height:"+svg.getAttribute("height")+';">';
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}
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if (data.png) {
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var callback = MathJax.Callback(function () {}); // for synchronization with MathJax
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fs.writeFileSync(tmpfile+".svg",svgfile);
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var batikCommand = fmt("java -jar %s -dpi %d '%s.svg'",BatikRasterizerPath,data.dpi,tmpfile);
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exec(batikCommand, function (err,stdout,stderr) {
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if (err) {AddError(err)} else {
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var buffer = fs.readFileSync(tmpfile+".png");
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result.png = "data:image/png;base64," + buffer.toString('base64');
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fs.unlinkSync(tmpfile+".svg"); fs.unlinkSync(tmpfile+".png");
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callback();
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}
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});
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return callback; // This keeps the queue from continuing until the exec() is complete
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}
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}
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//
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// Add the speech text and mark the SVG appropriately
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//
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function GetSpeech(svg,mml) {
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ID++; var id = "MathJax-SVG-"+ID;
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var speak = speech.processExpression(mml);
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svg.setAttribute("role","math");
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svg.setAttribute("aria-labelledby",id+"-Title "+id+"-Desc");
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for (var i=0, m=svg.childNodes.length; i < m; i++)
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{svg.childNodes[i].setAttribute("aria-hidden",true)}
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var node = MathJax.HTML.Element("desc",{id:id+"-Desc"},[speak]);
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svg.insertBefore(node,svg.firstChild);
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node = MathJax.HTML.Element("title",{id:id+"-Title"},["Equation"]);
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svg.insertBefore(node,svg.firstChild);
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}
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//
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// When the expression is typeset,
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// clear the timeout timer, if any,
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// update the MathJax state,
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// return the result object, and
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// do the next queued expression
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//
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function TypesetDone(result) {
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if (timer) {clearTimeout(timer); timer = null}
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html.removeAttribute("xmlns:"+data.xmlns);
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var state = data.state;
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if (state) {
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var AMS = MathJax.Extension["TeX/AMSmath"];
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var GLYPH = MathJax.OutputJax.SVG.BBOX.GLYPH;
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state.AMS.startNumber = AMS.startNumber;
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state.AMS.labels = AMS.labels;
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state.AMS.IDs = AMS.IDs;
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state.mmlID = MathJax.ElementJax.mml.SUPER.ID;
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state.glyphs = GLYPH.glyphs;
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state.defs = GLYPH.defs;
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state.n = GLYPH.n;
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state.ID = ID;
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}
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if (errors.length) {result.errors = errors}
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callback(result);
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StartQueue();
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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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//
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// Get the math data and callback
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// and set the content with the proper delimiters
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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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var delim = delimiters[data.format];
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var math = data.math;
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if (data.format !== "MathML") {
|
|
math = math.replace(/&/g,"&").replace(/</g,"<").replace(/>/g,">");
|
|
}
|
|
content.innerHTML = delim[0]+math+delim[1];
|
|
html.setAttribute("xmlns:"+data.xmlns,"http://www.w3.org/1998/Math/MathML");
|
|
|
|
//
|
|
// Set the SVG and TeX parameters
|
|
// according to the requested data
|
|
//
|
|
var SVG = MathJax.OutputJax.SVG,
|
|
TEX = MathJax.InputJax.TeX,
|
|
MML = MathJax.ElementJax.mml,
|
|
AMS = MathJax.Extension["TeX/AMSmath"],
|
|
HUB = MathJax.Hub, HTML = MathJax.HTML,
|
|
GLYPH = SVG.BBOX.GLYPH;
|
|
|
|
SVG.defaultEx = data.ex;
|
|
SVG.defaultWidth = data.width;
|
|
SVG.config.linebreaks.automatic = data.linebreaks;
|
|
SVG.config.linebreaks.width = data.width * data.ex;
|
|
SVG.config.useFontCache = data.useFontCache;
|
|
SVG.config.useGlobalCache = data.useGlobalCache;
|
|
TEX.config.equationNumbers.autoNumber = data.equationNumbers;
|
|
|
|
//
|
|
// Update the MathJax values from the state,
|
|
// or clear them if there is no state.
|
|
//
|
|
var state = data.state;
|
|
if (state && state.AMS) {
|
|
AMS.startNumber = state.AMS.startNumber;
|
|
AMS.labels = state.AMS.labels;
|
|
AMS.IDs = state.AMS.IDs;
|
|
MML.SUPER.ID = state.mmlID;
|
|
GLYPH.glyphs = state.glyphs;
|
|
GLYPH.defs = state.defs;
|
|
GLYPH.n = state.n;
|
|
ID = state.ID;
|
|
} else {
|
|
if (state) {state.AMS = {}}
|
|
SVG.resetGlyphs(true);
|
|
if (data.useGlobalCache) {
|
|
state.glyphs = {};
|
|
state.defs = HTML.Element("defs");
|
|
state.n = 0;
|
|
}
|
|
TEX.resetEquationNumbers();
|
|
MML.SUPER.ID = ID = 0;
|
|
}
|
|
|
|
//
|
|
// Set up a timeout timer to restart MathJax if it runs too long,
|
|
// Then push the Typeset call, the MathML and SVG calls, and our
|
|
// TypesetDone routine
|
|
//
|
|
timer = setTimeout(RestartMathJax,data.timeout);
|
|
var result = {}, $$ = window.Array;
|
|
HUB.Queue(
|
|
$$("Typeset",HUB),
|
|
$$(GetMML,result),
|
|
$$(GetSVG,result),
|
|
$$(TypesetDone,result)
|
|
);
|
|
}
|
|
|
|
/********************************************************************/
|
|
|
|
//
|
|
// 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 = null;
|
|
ReportError("Timeout waiting for MathJax: restarting");
|
|
serverReady = false;
|
|
}
|
|
serverStarted = true;
|
|
GetWindow();
|
|
ConfigureMathJax();
|
|
StartMathJax();
|
|
}
|
|
|
|
/********************************************************************/
|
|
|
|
//
|
|
// The API call to typeset an equation
|
|
//
|
|
// %%% cache results?
|
|
// %%% check types and values of parameters
|
|
//
|
|
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]);
|
|
}}
|
|
if (data.state) {options.state = data.state}
|
|
if (!delimiters[options.format]) {ReportError("Unknown format: "+options.format,callback); return}
|
|
queue.push([options,callback]);
|
|
if (!serverStarted) {RestartMathJax()}
|
|
if (serverReady) 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
|
|
//
|
|
// E.g.
|
|
// mjAPI.congif({
|
|
// MathJax: {SVG: {font: "STIX-Web"}},
|
|
// displayErrors: false
|
|
// });
|
|
//
|
|
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.MathJax) {MathJaxConfig = config.MathJax}
|
|
}
|