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),
      },
    },
  };
});
