(function(Prism) {
	var funcPattern = /\\(?:[^a-z()[\]]|[a-z*]+)/i,
	    insideEqu = {
		    'equation-command': {
			    pattern: funcPattern,
			    alias: 'regex'
		    }
	    };

	Prism.languages.latex = {
		'comment': /%.*/m,
		// the verbatim environment prints whitespace to the document
		'cdata':  {
			pattern: /(\\begin\{((?:verbatim|lstlisting)\*?)\})[\s\S]*?(?=\\end\{\2\})/,
			lookbehind: true
		},
		/*
		 * equations can be between $ $ or \( \) or \[ \]
		 * (all are multiline)
		 */
		'equation': [
			{
				pattern: /\$(?:\\[\s\S]|[^\\$])*\$|\\\([\s\S]*?\\\)|\\\[[\s\S]*?\\\]/,
				inside: insideEqu,
				alias: 'string'
			},
			{
				pattern: /(\\begin\{((?:equation|math|eqnarray|align|multline|gather)\*?)\})[\s\S]*?(?=\\end\{\2\})/,
				lookbehind: true,
				inside: insideEqu,
				alias: 'string'
			}
		],
		/*
		 * arguments which are keywords or references are highlighted
		 * as keywords
		 */
		'keyword': {
			pattern: /(\\(?:begin|end|ref|cite|label|usepackage|documentclass)(?:\[[^\]]+\])?\{)[^}]+(?=\})/,
			lookbehind: true
		},
		'url': {
			pattern: /(\\url\{)[^}]+(?=\})/,
			lookbehind: true
		},
		/*
		 * section or chapter headlines are highlighted as bold so that
		 * they stand out more
		 */
		'headline': {
			pattern: /(\\(?:part|chapter|section|subsection|frametitle|subsubsection|paragraph|subparagraph|subsubparagraph|subsubsubparagraph)\*?(?:\[[^\]]+\])?\{)[^}]+(?=\}(?:\[[^\]]+\])?)/,
			lookbehind: true,
			alias: 'class-name'
		},
		'function': {
			pattern: funcPattern,
			alias: 'selector'
		},
		'punctuation': /[[\]{}&]/
	};
})(Prism);
