/**
 * Original by Samuel Flores
 *
 * Adds the following new token classes:
 * 		constant, builtin, variable, symbol, regex
 */
Prism.languages.ruby = Prism.languages.extend('clike', {
	'comment': /#(?!\{[^\r\n]*?\})[^\r\n]*(\r?\n|$)/,
	'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/,
	'builtin': /\b(Array|Bignum|Binding|Class|Continuation|Dir|Exception|FalseClass|File|Stat|File|Fixnum|Fload|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][a-zA-Z_0-9]*[?!]?\b/
});

Prism.languages.insertBefore('ruby', 'keyword', {
	'regex': {
		pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\r\n])+\/[gim]{0,3}(?=\s*($|[\r\n,.;})]))/,
		lookbehind: true
	},
	'variable': /[@$]+\b[a-zA-Z_][a-zA-Z_0-9]*[?!]?\b/,
	'symbol': /:\b[a-zA-Z_][a-zA-Z_0-9]*[?!]?\b/
});

Prism.languages.ruby.string = {
	pattern: /("|')(#\{[^}]+\}|\\\n|\\?.)*?\1/,
	inside: {
		'interpolation': {
			pattern: /#\{[^}]+\}/,
			inside: {
				'delimiter': {
					pattern: /^#\{|\}$/,
					alias: 'tag'
				},
				rest: Prism.util.clone(Prism.languages.ruby)
			}
		}
	}
};
