update elements and fix some bugs

lib/src/prism/components/prism-latex.js

-Prism.languages.latex = {
-        'comment': /%.*?(\r?\n|$)$/m,
-        'string': /(\$)(\\?.)*?\1/,
-        'punctuation': /[{}]/,
-        'selector': /\\[a-z;,:\.]*/i
-};
+(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)\*?)\})([\w\W]*?)(?=\\end\{\2\})/,
+                        lookbehind: true
+                },
+                /*
+                 * equations can be between $ $ or \( \) or \[ \]
+                 * (all are multiline)
+                 */
+                'equation': [
+                        {
+                                pattern: /\$(?:\\?[\w\W])*?\$|\\\((?:\\?[\w\W])*?\\\)|\\\[(?:\\?[\w\W])*?\\\]/,
+                                inside: insideEqu,
+                                alias: 'string'
+                        },
+                        {
+                                pattern: /(\\begin\{((?:equation|math|eqnarray|align|multline|gather)\*?)\})([\w\W]*?)(?=\\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);