refractor/lang/ruby.js

Lightweight, robust, elegant virtual syntax highlighting using Prism

'use strict';

module.exports = ruby;
ruby.displayName = 'ruby';
ruby.aliases = [];
function ruby(Prism) {
  /**
   * Original by Samuel Flores
   *
   * Adds the following new token classes:
   *      constant, builtin, variable, symbol, regex
   */
  (function(Prism) {
    Prism.languages.ruby = Prism.languages.extend('clike', {
      comment: [
        /#(?!\{[^\r\n]*?\}).*/,
        /^=begin(?:\r?\n|\r)(?:.*(?:\r?\n|\r))*?=end/m
      ],
      keyword: /\b(?:alias|and|BEGIN|begin|break|case|class|def|define_method|defined|do|each|else|elsif|END|end|ensure|false|for|if|in|module|new|next|nil|not|or|raise|redo|require|rescue|retry|return|self|super|then|throw|true|undef|unless|until|when|while|yield)\b/
    });
    var interpolation = {
      pattern: /#\{[^}]+\}/,
      inside: {
        delimiter: {
          pattern: /^#\{|\}$/,
          alias: 'tag'
        },
        rest: Prism.util.clone(Prism.languages.ruby)
      }
    };
    Prism.languages.insertBefore('ruby', 'keyword', {
      regex: [
        {
          pattern: /%r([^a-zA-Z0-9\s{(\[<])(?:(?!\1)[^\\]|\\[\s\S])*\1[gim]{0,3}/,
          greedy: true,
          inside: {
            interpolation: interpolation
          }
        },
        {
          pattern: /%r\((?:[^()\\]|\\[\s\S])*\)[gim]{0,3}/,
          greedy: true,
          inside: {
            interpolation: interpolation
          }
        },
        {
          // Here we need to specifically allow interpolation
          pattern: /%r\{(?:[^#{}\\]|#(?:\{[^}]+\})?|\\[\s\S])*\}[gim]{0,3}/,
          greedy: true,
          inside: {
            interpolation: interpolation
          }
        },
        {
          pattern: /%r\[(?:[^\[\]\\]|\\[\s\S])*\][gim]{0,3}/,
          greedy: true,
          inside: {
            interpolation: interpolation
          }
        },
        {
          pattern: /%r<(?:[^<>\\]|\\[\s\S])*>[gim]{0,3}/,
          greedy: true,
          inside: {
            interpolation: interpolation
          }
        },
        {
          pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\\\r\n])+\/[gim]{0,3}(?=\s*($|[\r\n,.;})]))/,
          lookbehind: true,
          greedy: true
        }
      ],
      variable: /[@$]+[a-zA-Z_]\w*(?:[?!]|\b)/,
      symbol: /:[a-zA-Z_]\w*(?:[?!]|\b)/
    });
    Prism.languages.insertBefore('ruby', 'number', {
      builtin: /\b(?:Array|Bignum|Binding|Class|Continuation|Dir|Exception|FalseClass|File|Stat|Fixnum|Float|Hash|Integer|IO|MatchData|Method|Module|NilClass|Numeric|Object|Proc|Range|Regexp|String|Struct|TMS|Symbol|ThreadGroup|Thread|Time|TrueClass)\b/,
      constant: /\b[A-Z]\w*(?:[?!]|\b)/
    });
    Prism.languages.ruby.string = [
      {
        pattern: /%[qQiIwWxs]?([^a-zA-Z0-9\s{(\[<])(?:(?!\1)[^\\]|\\[\s\S])*\1/,
        greedy: true,
        inside: {
          interpolation: interpolation
        }
      },
      {
        pattern: /%[qQiIwWxs]?\((?:[^()\\]|\\[\s\S])*\)/,
        greedy: true,
        inside: {
          interpolation: interpolation
        }
      },
      {
        // Here we need to specifically allow interpolation
        pattern: /%[qQiIwWxs]?\{(?:[^#{}\\]|#(?:\{[^}]+\})?|\\[\s\S])*\}/,
        greedy: true,
        inside: {
          interpolation: interpolation
        }
      },
      {
        pattern: /%[qQiIwWxs]?\[(?:[^\[\]\\]|\\[\s\S])*\]/,
        greedy: true,
        inside: {
          interpolation: interpolation
        }
      },
      {
        pattern: /%[qQiIwWxs]?<(?:[^<>\\]|\\[\s\S])*>/,
        greedy: true,
        inside: {
          interpolation: interpolation
        }
      },
      {
        pattern: /("|')(?:#\{[^}]+\}|\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
        greedy: true,
        inside: {
          interpolation: interpolation
        }
      }
    ];
  })(Prism);
}