tex2mml

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

/*************************************************************************
 *
 *  custom-tex-extension/tex2mml
 *
 *  Uses MathJax v3 to show how to create and load a custom tex extension.
 *
 * ----------------------------------------------------------------------
 *
 *  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 mml extension defines \mi{}, \mo{}, \mn{}, \ms{}, \mtext{} for creating
 * MathML token elements by hand.  They take an optional bracketed argument
 * that gives the attributes for the element, e.g.
 *
 *    \mi[mathvariant="bold-italic"]{abc}
 *
 * The text for the token element is taken as a literal string, except for
 * the special sequence \uXXXX, which produces the unicode character U+XXXX.
 */

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

//
//  Get the command-line arguments
//
var argv = require('yargs')
    .demand(0).strict()
    .usage('$0 [options] "math" > file.html')
    .options({
        inline: {
            boolean: true,
            describe: "process as inline math"
        },
        packages: {
            default: PACKAGES,
            describe: 'the packages to use, e.g. "base, ams"; use "*" to represent the default packages, e.g, "*, bbox"'
        },
        dist: {
            boolean: true,
            default: false,
            describe: 'true to use webpacked version, false to use mathjax3 source files'
        }
    })
    .argv;

//
//  Configure MathJax
//
MathJax = {
    loader: {
        paths: {
            mathjax: 'mathjax-full/es5',
            custom: '.'
        },
        source: (argv.dist ? {} : require('mathjax-full/components/src/source.js').source),
        require: require,
        load: ['input/tex', 'adaptors/liteDOM', '[custom]/mml']
    },
    tex: {packages: argv.packages.replace('\*', PACKAGES).split(/\s*,\s*/)},
    startup: {
        pageReady: () => {
            MathJax.tex2mmlPromise(argv._[0] || '', {display: !argv.inline})
                .then(mml => console.log(mml))
                .catch(err => console.log(err));
        }
    }
};

//
//  Load the MathJax startup module
//
require('mathjax-full/' + (argv.dist ? 'es5' : 'components/src/startup') + '/startup.js');