refractor/lang/elixir.js

Lightweight, robust, elegant virtual syntax highlighting using Prism

'use strict';

module.exports = elixir;
elixir.displayName = 'elixir';
elixir.aliases = [];
function elixir(Prism) {
  Prism.languages.elixir = {
    // Negative look-ahead is needed for string interpolation
    // Negative look-behind is needed to avoid highlighting markdown headers in
    // multi-line doc strings
    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: /~[rR](?:("""|''')(?:\\[\s\S]|(?!\1)[^\\])+\1|([\/|"'])(?:\\.|(?!\2)[^\\\r\n])+\2|\((?:\\.|[^\\)\r\n])+\)|\[(?:\\.|[^\\\]\r\n])+\]|\{(?:\\.|[^\\}\r\n])+\}|<(?:\\.|[^\\>\r\n])+>)[uismxfr]*/,
    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(function(o) {
    o.inside = {
      interpolation: {
        pattern: /#\{[^}]+\}/,
        inside: {
          delimiter: {
            pattern: /^#\{|\}$/,
            alias: 'punctuation'
          },
          rest: Prism.util.clone(Prism.languages.elixir)
        }
      }
    };
  });
}