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Merge branch 'page-png'
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‎bin/page2png‎

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Original file line numberDiff line numberDiff line change
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#! /usr/bin/env node
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/************************************************************************
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*
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* page2png
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*
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* Reads an HTML5 file from stdin that contains math
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* and writes a new HTML5 document to stdout that
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* contains PNG versions of the math instead.
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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 mjAPI = require("../lib/mj-page.js");
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var fs = require('fs');
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var jsdom = require('jsdom').jsdom;
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var argv = require("yargs")
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.strict()
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.usage("Usage: page2png [options] < input.html > output.html",{
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preview: {
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boolean: true,
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describe: "make PNG into a Mathjax preview"
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},
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speech: {
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boolean: true,
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describe: "include speech text"
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},
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speechrules: {
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default: "mathspeak",
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describe: "ruleset to use for speech text (chromevox or mathspeak)"
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},
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speechstyle: {
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default: "default",
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describe: "style to use for speech text (default, brief, sbrief)"
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},
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linebreaks: {
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boolean: true,
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describe: "perform automatic line-breaking"
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},
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nodollars: {
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boolean: true,
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describe: "don't use single-dollar delimiters"
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},
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format: {
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default: "AsciiMath,TeX,MathML",
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describe: "input format(s) to look for"
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},
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eqno: {
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default: "none",
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describe: "equation number style (none, AMS, or all)"
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},
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img: {
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default: "",
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describe: "make external svg images with this name prefix"
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},
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dpi: {
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default: "144",
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describe: "the dpi for the PNG images"
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},
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font: {
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default: "TeX",
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describe: "web font to use"
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},
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ex: {
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default: 6,
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describe: "ex-size in pixels"
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},
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width: {
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default: 100,
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describe: "width of container in ex"
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}
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})
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.argv;
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argv.format = argv.format.split(/ *, */);
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if (argv.font === "STIX") argv.font = "STIX-Web";
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mjAPI.config({MathJax: {SVG: {font: argv.font}}});
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mjAPI.start();
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//
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// Process an HTML file:
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//
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function processHTML(html,callback) {
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var document = jsdom(html,null,{features:{FetchExternalResources: false}});
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var xmlns = getXMLNS(document);
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mjAPI.typeset({
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html: document.body.innerHTML,
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renderer: "PNG", dpi: argv.dpi,
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inputs: argv.format,
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equationNumbers: argv.eqno,
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singleDollars: !argv.nodollars,
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useGlobalCache: false,
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addPreview: argv.preview,
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speakText: argv.speech,
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speakRuleset: argv.speechrules.replace(/^chromevox$/i,"default"),
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speakStyle: argv.speechstyle,
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ex: argv.ex, width: argv.width,
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linebreaks: argv.linebreaks,
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xmlns:xmlns
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}, function (result) {
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document.body.innerHTML = result.html;
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document.head.appendChild(document.body.firstChild);
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if (argv.img !== "") {
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var img = document.getElementsByClassName("MathJax_PNG_IMG");
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for (var i = 0, m = img.length; i < m; i++) {
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var N = (i+1).toString(); while (N.length < 4) {N = "0"+N}
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var file = argv.img+N+".png";
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fs.writeFileSync(file,new Buffer(img[i].src.replace(/^.*?,/,""),"base64"));
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img[i].src = file;
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}
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}
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var HTML = "<!DOCTYPE html>\n"+document.documentElement.outerHTML.replace(/^(\n|\s)*/,"");
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callback(HTML);
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});
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}
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//
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// Look up the MathML namespace from the <html> attributes
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//
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function getXMLNS(document) {
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var html = document.head.parentNode;
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for (var i = 0, m = html.attributes.length; i < m; i++) {
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var attr = html.attributes[i];
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if (attr.nodeName.substr(0,6) === "xmlns:" &&
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attr.nodeValue === "http://www.w3.org/1998/Math/MathML")
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{return attr.nodeName.substr(6)}
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}
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return "mml";
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}
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//
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// Read the input file and collect the file contents
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// When done, process the HTML.
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//
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var html = [];
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process.stdin.on("readable",function (block) {
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var chunk = process.stdin.read();
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if (chunk) html.push(chunk.toString('utf8'));
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});
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process.stdin.on("end",function () {
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processHTML(html.join(""), function(html) {
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process.stdout.write(html);
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});
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});

‎lib/mj-page.js‎

Lines changed: 63 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -28,7 +28,9 @@
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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
@@ -50,6 +52,7 @@ var defaults = {
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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?
@@ -72,11 +75,14 @@ var STATE = {
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};
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var MathJaxPath = "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 = "/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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8288
var queue = []; // queue of typesetting requests of the form [data,callback]
@@ -535,6 +541,18 @@ function AdjustSVG() {
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//
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nodes = document.querySelectorAll(".MathJax_SVG[role=textbox], .MathJax_SVG_Display[role=textbox]");
537543
for (i = nodes.length-1; i >= 0; i--) nodes[i].setAttribute("role","math");
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//
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// Fix a problem with jsdom not setting width and height CSS.
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//
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nodes = document.querySelectorAll(".MathJax_SVG > span > span");
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for (i = nodes.length-1; i >= 0; i--) {
549+
var child = nodes[i].firstChild;
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SetWH(nodes[i],child.getAttribute("width"),child.getAttribute("height"));
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}
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//
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// Add speech text, if needed
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//
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if (data.speakText) {callback = GetSpeech()}
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}
539557
if (data.renderer === "SVG") {
540558
//
@@ -552,18 +570,6 @@ function AdjustSVG() {
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styles.innerHTML = STYLES;
553571
styles.id="MathJax_SVG_styles";
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content.insertBefore(styles,content.firstChild);
555-
//
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// Fix a problem with jsdom not setting width and height CSS.
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//
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nodes = document.querySelectorAll(".MathJax_SVG > span > span");
559-
for (i = nodes.length-1; i >= 0; i--) {
560-
var child = nodes[i].firstChild;
561-
SetWH(nodes[i],child.getAttribute("width"),child.getAttribute("height"));
562-
}
563-
//
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// Add speech text, if needed
565-
//
566-
if (data.speakText) {callback = GetSpeech()}
567573
}
568574
return callback;
569575
}
@@ -580,11 +586,12 @@ function GetSpeech() {
580586
if (!queue) {queue = MathJax.Callback.Queue()}
581587
return queue.Push(err.restart,window.Array(SPEAK,svg));
582588
}
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jax.speech = speech.processExpression(mml);
583590
svg.setAttribute("role","math");
584591
svg.setAttribute("aria-labelledby",id+"-Title "+id+"-Desc");
585592
for (var i = 0, m = svg.childNodes.length; i < m; i++)
586593
svg.childNodes[i].setAttribute("aria-hidden",true);
587-
var node = MathJax.HTML.Element("desc",{id:id+"-Desc"},[speech.processExpression(mml)]);
594+
var node = MathJax.HTML.Element("desc",{id:id+"-Desc"},[jax.speech]);
588595
svg.insertBefore(node,svg.firstChild);
589596
node = MathJax.HTML.Element("title",{id:id+"-Title"},["Equation"]);
590597
svg.insertBefore(node,svg.firstChild);
@@ -612,7 +619,7 @@ function AdjustMML() {
612619
//
613620
function MakeIMG() {
614621
if (data.renderer === "IMG") {
615-
var n = 0, nodes = document.getElementsByClassName("MathJax_SVG");
622+
var nodes = document.getElementsByClassName("MathJax_SVG");
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for (var i = nodes.length-1; i >= 0; i--) {
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var svg = nodes[i].getElementsByTagName("svg")[0];
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var w = svg.getAttribute("width"), h = svg.getAttribute("height");
@@ -626,6 +633,7 @@ function MakeIMG() {
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className: "MathJax_SVG_IMG",
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});
628635
SetWH(img,w,h); // work around jsdom bug with width and height CSS
636+
if (data.speakText) img.setAttribute("alt",MathJax.Hub.getJaxFor(nodes[i]).speech);
629637
nodes[i].parentNode.replaceChild(img,nodes[i]);
630638
}
631639
}
@@ -635,6 +643,47 @@ function MakeIMG() {
635643
// Make PNG images and attach them to IMG tags
636644
//
637645
function MakePNG() {
646+
if (data.renderer === "PNG") {
647+
var synch = MathJax.Callback(function () {}); // for synchronization with MathJax
648+
var batikCommand = fmt("java -jar %s -dpi %d '%s.svg'",BatikRasterizerPath,data.dpi,tmpfile);
649+
var tmpSVG = tmpfile+".svg", tmpPNG = tmpfile+".png";
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var nodes = document.getElementsByClassName("MathJax_SVG");
651+
var check = function (err) {if (err) {AddError(err.message); return true}}
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var PNG = function (i) {
653+
if (i < 0) return synch(); // signal everything is done
654+
var svg = nodes[i].getElementsByTagName("svg")[0];
655+
var w = svg.getAttribute("width"), h = svg.getAttribute("height");
656+
var css = svg.style.cssText+" width:"+w+"; height:"+h;
657+
svg.style.cssText = ""; // this will be handled by the <img> tag instead
658+
svg.setAttribute("xmlns","http://www.w3.org/2000/svg");
659+
svg = [
660+
'<?xml version="1.0" standalone="no"?>',
661+
'<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">',
662+
svg.outerHTML
663+
].join("\n");
664+
fs.writeFile(tmpSVG,svg,function (err) {
665+
if (check(err)) return PNG(i-1);
666+
exec(batikCommand, function (err,stdout,stderr) {
667+
if (check(err)) {fs.unlinkSync(tmpSVG); return PNG(i-1)}
668+
fs.readFile(tmpPNG,null,function (err,buffer) {
669+
if (!check(err)) {
670+
var img = MathJax.HTML.Element("img",{
671+
src:"data:image/png;base64,"+buffer.toString('base64'),
672+
style:{cssText:css}, className: "MathJax_PNG_IMG",
673+
});
674+
SetWH(img,w,h); // work around jsdom bug with width and height CSS
675+
if (data.speakText) img.setAttribute("alt",MathJax.Hub.getJaxFor(nodes[i]).speech);
676+
nodes[i].parentNode.replaceChild(img,nodes[i]);
677+
}
678+
fs.unlinkSync(tmpSVG); fs.unlinkSync(tmpPNG);
679+
PNG(i-1);
680+
});
681+
});
682+
});
683+
}
684+
PNG(nodes.length-1);
685+
}
686+
return synch;
638687
}
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640689
//

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