tex2svg-page

#! /usr/bin/env -S node -r esm

/*************************************************************************
 *
 *  simple/tex2svg-page
 *
 *  Uses MathJax v3 to convert all TeX in an SVG document.
 *
 * ----------------------------------------------------------------------
 *
 *  Copyright (c) 2019 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.
 */

//
//  The default TeX packages to use
//
const PACKAGES = 'base, autoload, require, ams, newcommand';

//
//  Get the command-line arguments
//
var argv = require('yargs')
    .demand(0).strict()
    .usage('$0 [options] file.html > converted.html')
    .options({
        em: {
            default: 16,
            describe: 'em-size in pixels'
        },
        ex: {
            default: 8,
            describe: 'ex-size in pixels'
        },
        packages: {
            default: PACKAGES,
            describe: 'the packages to use, e.g. "base, ams"; use "*" to represent the default packages, e.g, "*, bbox"'
        },
        fontCache: {
            default: 'global',
            describe: 'cache type: local, global, or none'
        },
        dist: {
            boolean: true,
            default: false,
            describe: 'true to use webpacked version, false to use MathJax source files'
        }
    })
    .argv;

//
//  Read the HTML file
//
const htmlfile = require('fs').readFileSync(argv._[0], 'utf8');

//
// Load MathJax and initialize MathJax and typeset the given math
//
require('mathjax-full').init({
    //
    //  The MathJax configuration
    //
    loader: {
        source: (argv.dist ? {} : require('mathjax-full/components/src/source.js').source),
        load: ['adaptors/liteDOM', 'tex-svg']
    },
    tex: {
        packages: argv.packages.replace('\*', PACKAGES).split(/\s*,\s*/)
    },
    svg: {
        fontCache: argv.fontCache,
        exFactor: argv.ex / argv.em
    },
    'adaptors/liteDOM': {
        fontSize: argv.em
    },
    startup: {
        document: htmlfile
    }
}).then((MathJax) => {
    //
    //  Display the output
    //
    const adaptor = MathJax.startup.adaptor;
    const html = MathJax.startup.document;
    if (Array.from(html.math).length === 0) {
      adaptor.remove(html.outputJax.svgStyles);
      const cache = adaptor.elementById(adaptor.body(html.document), 'MJX-SVG-global-cache');
      if (cache) adaptor.remove(cache);
    }
    console.log(adaptor.doctype(html.document));
    console.log(adaptor.outerHTML(adaptor.root(html.document)));
}).catch(err => console.log(err));