refractor/lang/latex.js

Lightweight, robust, elegant virtual syntax highlighting using Prism

'use strict';

module.exports = latex;
latex.displayName = 'latex';
latex.aliases = [];
function latex(Prism) {
  (function(Prism) {
    var funcPattern = /\\(?:[^a-z()[\]]|[a-z*]+)/i,
      insideEqu = {
        'equation-command': {
          pattern: funcPattern,
          alias: 'regex'
        }
      };
    Prism.languages.latex = {
      comment: /%.*/m,
      // the verbatim environment prints whitespace to the document
      cdata: {
        pattern: /(\\begin\{((?:verbatim|lstlisting)\*?)\})[\s\S]*?(?=\\end\{\2\})/,
        lookbehind: true
      },
      /*
* equations can be between $ $ or \( \) or \[ \]
* (all are multiline)
*/
      equation: [
        {
          pattern: /\$(?:\\[\s\S]|[^\\$])*\$|\\\([\s\S]*?\\\)|\\\[[\s\S]*?\\\]/,
          inside: insideEqu,
          alias: 'string'
        },
        {
          pattern: /(\\begin\{((?:equation|math|eqnarray|align|multline|gather)\*?)\})[\s\S]*?(?=\\end\{\2\})/,
          lookbehind: true,
          inside: insideEqu,
          alias: 'string'
        }
      ],
      /*
* arguments which are keywords or references are highlighted
* as keywords
*/
      keyword: {
        pattern: /(\\(?:begin|end|ref|cite|label|usepackage|documentclass)(?:\[[^\]]+\])?\{)[^}]+(?=\})/,
        lookbehind: true
      },
      url: {
        pattern: /(\\url\{)[^}]+(?=\})/,
        lookbehind: true
      },
      /*
* section or chapter headlines are highlighted as bold so that
* they stand out more
*/
      headline: {
        pattern: /(\\(?:part|chapter|section|subsection|frametitle|subsubsection|paragraph|subparagraph|subsubparagraph|subsubsubparagraph)\*?(?:\[[^\]]+\])?\{)[^}]+(?=\}(?:\[[^\]]+\])?)/,
        lookbehind: true,
        alias: 'class-name'
      },
      function: {
        pattern: funcPattern,
        alias: 'selector'
      },
      punctuation: /[[\]{}&]/
    };
  })(Prism);
}