text: (function(Prism) {
  	Prism.languages.crystal = Prism.languages.extend('ruby', {
  		keyword: [
  			/\b(?:abstract|alias|as|asm|begin|break|case|class|def|do|else|elsif|end|ensure|enum|extend|for|fun|if|include|instance_sizeof|lib|macro|module|next|of|out|pointerof|private|protected|rescue|return|require|select|self|sizeof|struct|super|then|type|typeof|uninitialized|union|unless|until|when|while|with|yield|__DIR__|__END_LINE__|__FILE__|__LINE__)\b/,
  			{
  				pattern: /(\.\s*)(?:is_a|responds_to)\?/,
  				lookbehind: true
  			}
  		],
  
  		number: /\b(?:0b[01_]*[01]|0o[0-7_]*[0-7]|0x[\da-fA-F_]*[\da-fA-F]|(?:\d(?:[\d_]*\d)?)(?:\.[\d_]*\d)?(?:[eE][+-]?[\d_]*\d)?)(?:_(?:[uif](?:8|16|32|64))?)?\b/
  	});
  
  	Prism.languages.insertBefore('crystal', 'string', {
  		attribute: {
  			pattern: /@\[.+?\]/,
  			alias: 'attr-name',
  			inside: {
  				delimiter: {
  					pattern: /^@\[|\]$/,
  					alias: 'tag'
  				},
  				rest: Prism.languages.crystal
  			}
  		},
  
  		expansion: [
  		{
  			pattern: /\{\{.+?\}\}/,
  			inside: {
  				delimiter: {
  					pattern: /^\{\{|\}\}$/,
  					alias: 'tag'
  				},
  				rest: Prism.languages.crystal
  			}
  		},
  		{
  			pattern: /\{%.+?%\}/,
  			inside: {
  				delimiter: {
  					pattern: /^\{%|%\}$/,
  					alias: 'tag'
  				},
  				rest: Prism.languages.crystal
  			}
  		}
  		]
  	});
  
  }(Prism));
  