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tex2svg
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tex2svg
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#! /usr/bin/env node
/*************************************************************************
*
* direct/tex2svg
*
* Uses MathJax v3 to convert a TeX string to an SVG string.
*
* ----------------------------------------------------------------------
*
* Copyright (c) 2018 The MathJax Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// Load the packages needed for MathJax
//
const {mathjax} = require('mathjax-full/js/mathjax.js');
const {TeX} = require('mathjax-full/js/input/tex.js');
const {SVG} = require('mathjax-full/js/output/svg.js');
const {liteAdaptor} = require('mathjax-full/js/adaptors/liteAdaptor.js');
const {RegisterHTMLHandler} = require('mathjax-full/js/handlers/html.js');
const {AssistiveMmlHandler} = require('mathjax-full/js/a11y/assistive-mml.js');
const {AllPackages} = require('mathjax-full/js/input/tex/AllPackages.js');
//
// Minimal CSS needed for stand-alone image
//
const CSS = [
'svg a{fill:blue;stroke:blue}',
'[data-mml-node="merror"]>g{fill:red;stroke:red}',
'[data-mml-node="merror"]>rect[data-background]{fill:yellow;stroke:none}',
'[data-frame],[data-line]{stroke-width:70px;fill:none}',
'.mjx-dashed{stroke-dasharray:140}',
'.mjx-dotted{stroke-linecap:round;stroke-dasharray:0,140}',
'use[data-c]{stroke-width:3px}'
].join('');
//
// Get the command-line arguments
//
var argv = require('yargs')
.demand(0).strict()
.usage('$0 [options] "math" > file.svg')
.options({
inline: {
boolean: true,
describe: "process as inline math"
},
em: {
default: 16,
describe: 'em-size in pixels'
},
ex: {
default: 8,
describe: 'ex-size in pixels'
},
width: {
default: 80 * 16,
describe: 'width of container in pixels'
},
packages: {
default: AllPackages.sort().join(', '),
describe: 'the packages to use, e.g. "base, ams"'
},
styles: {
boolean: true,
default: true,
describe: 'include css styles for stand-alone image'
},
container: {
boolean: true,
describe: 'include <mjx-container> element'
},
css: {
boolean: true,
describe: 'output the required CSS rather than the SVG itself'
},
fontCache: {
boolean: true,
default: true,
describe: 'whether to use a local font cache or not'
},
assistiveMml: {
boolean: true,
default: false,
describe: 'whether to include assistive MathML output'
}
})
.argv;
//
// Create DOM adaptor and register it for HTML documents
//
const adaptor = liteAdaptor();
const handler = RegisterHTMLHandler(adaptor);
if (argv.assistiveMml) AssistiveMmlHandler(handler);
//
// Create input and output jax and a document using them on the content from the HTML file
//
const tex = new TeX({packages: argv.packages.split(/\s*,\s*/)});
const svg = new SVG({fontCache: (argv.fontCache ? 'local' : 'none')});
const html = mathjax.document('', {InputJax: tex, OutputJax: svg});
//
// Typeset the math from the command line
//
const node = html.convert(argv._[0] || '', {
display: !argv.inline,
em: argv.em,
ex: argv.ex,
containerWidth: argv.width
});
//
// If the --css option was specified, output the CSS,
// Otherwise, typeset the math and output the HTML
//
if (argv.css) {
console.log(adaptor.textContent(svg.styleSheet(html)));
} else {
let html = (argv.container ? adaptor.outerHTML(node) : adaptor.innerHTML(node));
console.log(argv.styles ? html.replace(/<defs>/, `<defs><style>${CSS}</style>`) : html);
}