reprism/src/languages/latex.js

Modular Syntax highlighting for the web

export default {
  language: 'latex',
  init: Prism => {
    (function (Prism) {
      let 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))
  },
}