source: node_modules/highlight.js/lib/languages/dos.js

/*
Language: Batch file (DOS)
Author: Alexander Makarov <sam@rmcreative.ru>
Contributors: Anton Kochkov <anton.kochkov@gmail.com>
Website: https://en.wikipedia.org/wiki/Batch_file
*/

/** @type LanguageFn */
function dos(hljs) {
  const COMMENT = hljs.COMMENT(
    /^\s*@?rem\b/, /$/,
    {
      relevance: 10
    }
  );
  const LABEL = {
    className: 'symbol',
    begin: '^\\s*[A-Za-z._?][A-Za-z0-9_$#@~.?]*(:|\\s+label)',
    relevance: 0
  };
  return {
    name: 'Batch file (DOS)',
    aliases: [
      'bat',
      'cmd'
    ],
    case_insensitive: true,
    illegal: /\/\*/,
    keywords: {
      keyword:
        'if else goto for in do call exit not exist errorlevel defined ' +
        'equ neq lss leq gtr geq',
      built_in:
        'prn nul lpt3 lpt2 lpt1 con com4 com3 com2 com1 aux ' +
        'shift cd dir echo setlocal endlocal set pause copy ' +
        'append assoc at attrib break cacls cd chcp chdir chkdsk chkntfs cls cmd color ' +
        'comp compact convert date dir diskcomp diskcopy doskey erase fs ' +
        'find findstr format ftype graftabl help keyb label md mkdir mode more move path ' +
        'pause print popd pushd promt rd recover rem rename replace restore rmdir shift ' +
        'sort start subst time title tree type ver verify vol ' +
        // winutils
        'ping net ipconfig taskkill xcopy ren del'
    },
    contains: [
      {
        className: 'variable',
        begin: /%%[^ ]|%[^ ]+?%|![^ ]+?!/
      },
      {
        className: 'function',
        begin: LABEL.begin,
        end: 'goto:eof',
        contains: [
          hljs.inherit(hljs.TITLE_MODE, {
            begin: '([_a-zA-Z]\\w*\\.)*([_a-zA-Z]\\w*:)?[_a-zA-Z]\\w*'
          }),
          COMMENT
        ]
      },
      {
        className: 'number',
        begin: '\\b\\d+',
        relevance: 0
      },
      COMMENT
    ]
  };
}

module.exports = dos;