(function(Prism) {
  // Ignore comments starting with { to privilege string interpolation highlighting
  var comment = /#(?!\{).+/,
    interpolation = {
      pattern: /#\{[^}]+\}/,
      alias: 'variable',
    };

  Prism.languages.coffeescript = Prism.languages.extend('javascript', {
    comment: comment,
    string: [
      // Strings are multiline
      {
        pattern: /'(?:\\[\s\S]|[^\\'])*'/,
        greedy: true,
      },

      {
        // Strings are multiline
        pattern: /"(?:\\[\s\S]|[^\\"])*"/,
        greedy: true,
        inside: {
          interpolation: interpolation,
        },
      },
    ],
    keyword: /\b(?:and|break|by|catch|class|continue|debugger|delete|do|each|else|extend|extends|false|finally|for|if|in|instanceof|is|isnt|let|loop|namespace|new|no|not|null|of|off|on|or|own|return|super|switch|then|this|throw|true|try|typeof|undefined|unless|until|when|while|window|with|yes|yield)\b/,
    'class-member': {
      pattern: /@(?!\d)\w+/,
      alias: 'variable',
    },
  });

  Prism.languages.insertBefore('coffeescript', 'comment', {
    'multiline-comment': {
      pattern: /###[\s\S]+?###/,
      alias: 'comment',
    },

    // Block regexp can contain comments and interpolation
    'block-regex': {
      pattern: /\/{3}[\s\S]*?\/{3}/,
      alias: 'regex',
      inside: {
        comment: comment,
        interpolation: interpolation,
      },
    },
  });

  Prism.languages.insertBefore('coffeescript', 'string', {
    'inline-javascript': {
      pattern: /`(?:\\[\s\S]|[^\\`])*`/,
      inside: {
        delimiter: {
          pattern: /^`|`$/,
          alias: 'punctuation',
        },
        rest: Prism.languages.javascript,
      },
    },

    // Block strings
    'multiline-string': [
      {
        pattern: /'''[\s\S]*?'''/,
        greedy: true,
        alias: 'string',
      },
      {
        pattern: /"""[\s\S]*?"""/,
        greedy: true,
        alias: 'string',
        inside: {
          interpolation: interpolation,
        },
      },
    ],
  });

  Prism.languages.insertBefore('coffeescript', 'keyword', {
    // Object property
    property: /(?!\d)\w+(?=\s*:(?!:))/,
  });

  delete Prism.languages.coffeescript['template-string'];
})(Prism);
