reprism/src/languages/elixir.js

Modular Syntax highlighting for the web

export default {
  language: 'elixir',
  init: Prism => {
    Prism.languages.elixir = {
      comment: {
        pattern: /#.*/m,
        lookbehind: true,
      },
      // ~r"""foo""" (multi-line), ~r'''foo''' (multi-line), ~r/foo/, ~r|foo|, ~r"foo", ~r'foo', ~r(foo), ~r[foo], ~r{foo}, ~r<foo>
      regex: {
        pattern: /~[rR](?:("""|''')(?:\\[\s\S]|(?!\1)[^\\])+\1|([\/|"'])(?:\\.|(?!\2)[^\\\r\n])+\2|\((?:\\.|[^\\)\r\n])+\)|\[(?:\\.|[^\\\]\r\n])+\]|\{(?:\\.|[^\\}\r\n])+\}|<(?:\\.|[^\\>\r\n])+>)[uismxfr]*/,
        greedy: true,
      },
      string: [
        {
          // ~s"""foo""" (multi-line), ~s'''foo''' (multi-line), ~s/foo/, ~s|foo|, ~s"foo", ~s'foo', ~s(foo), ~s[foo], ~s{foo} (with interpolation care), ~s<foo>
          pattern: /~[cCsSwW](?:("""|''')(?:\\[\s\S]|(?!\1)[^\\])+\1|([\/|"'])(?:\\.|(?!\2)[^\\\r\n])+\2|\((?:\\.|[^\\)\r\n])+\)|\[(?:\\.|[^\\\]\r\n])+\]|\{(?:\\.|#\{[^}]+\}|[^\\}\r\n])+\}|<(?:\\.|[^\\>\r\n])+>)[csa]?/,
          greedy: true,
          inside: {
            // See interpolation below
          },
        },
        {
          pattern: /("""|''')[\s\S]*?\1/,
          greedy: true,
          inside: {
            // See interpolation below
          },
        },
        {
          // Multi-line strings are allowed
          pattern: /("|')(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
          greedy: true,
          inside: {
            // See interpolation below
          },
        },
      ],
      atom: {
        // Look-behind prevents bad highlighting of the :: operator
        pattern: /(^|[^:]):\w+/,
        lookbehind: true,
        alias: 'symbol',
      },
      // Look-ahead prevents bad highlighting of the :: operator
      'attr-name': /\w+:(?!:)/,
      capture: {
        // Look-behind prevents bad highlighting of the && operator
        pattern: /(^|[^&])&(?:[^&\s\d()][^\s()]*|(?=\())/,
        lookbehind: true,
        alias: 'function',
      },
      argument: {
        // Look-behind prevents bad highlighting of the && operator
        pattern: /(^|[^&])&\d+/,
        lookbehind: true,
        alias: 'variable',
      },
      attribute: {
        pattern: /@[\S]+/,
        alias: 'variable',
      },
      number: /\b(?:0[box][a-f\d_]+|\d[\d_]*)(?:\.[\d_]+)?(?:e[+-]?[\d_]+)?\b/i,
      keyword: /\b(?:after|alias|and|case|catch|cond|def(?:callback|exception|impl|module|p|protocol|struct)?|do|else|end|fn|for|if|import|not|or|require|rescue|try|unless|use|when)\b/,
      boolean: /\b(?:true|false|nil)\b/,
      operator: [
        /\bin\b|&&?|\|[|>]?|\\\\|::|\.\.\.?|\+\+?|-[->]?|<[-=>]|>=|!==?|\B!|=(?:==?|[>~])?|[*\/^]/,
        {
          // We don't want to match <<
          pattern: /([^<])<(?!<)/,
          lookbehind: true,
        },
        {
          // We don't want to match >>
          pattern: /([^>])>(?!>)/,
          lookbehind: true,
        },
      ],
      punctuation: /<<|>>|[.,%\[\]{}()]/,
    }

    Prism.languages.elixir.string.forEach(o => {
      o.inside = {
        interpolation: {
          pattern: /#\{[^}]+\}/,
          inside: {
            delimiter: {
              pattern: /^#\{|\}$/,
              alias: 'punctuation',
            },
            rest: Prism.languages.elixir,
          },
        },
      }
    })
  },
}