source: node_modules/prismjs/components/prism-tt2.js

(function (Prism) {

        Prism.languages.tt2 = Prism.languages.extend('clike', {
                'comment': /#.*|\[%#[\s\S]*?%\]/,
                'keyword': /\b(?:BLOCK|CALL|CASE|CATCH|CLEAR|DEBUG|DEFAULT|ELSE|ELSIF|END|FILTER|FINAL|FOREACH|GET|IF|IN|INCLUDE|INSERT|LAST|MACRO|META|NEXT|PERL|PROCESS|RAWPERL|RETURN|SET|STOP|SWITCH|TAGS|THROW|TRY|UNLESS|USE|WHILE|WRAPPER)\b/,
                'punctuation': /[[\]{},()]/
        });

        Prism.languages.insertBefore('tt2', 'number', {
                'operator': /=[>=]?|!=?|<=?|>=?|&&|\|\|?|\b(?:and|not|or)\b/,
                'variable': {
                        pattern: /\b[a-z]\w*(?:\s*\.\s*(?:\d+|\$?[a-z]\w*))*\b/i
                }
        });

        Prism.languages.insertBefore('tt2', 'keyword', {
                'delimiter': {
                        pattern: /^(?:\[%|%%)-?|-?%\]$/,
                        alias: 'punctuation'
                }
        });

        Prism.languages.insertBefore('tt2', 'string', {
                'single-quoted-string': {
                        pattern: /'[^\\']*(?:\\[\s\S][^\\']*)*'/,
                        greedy: true,
                        alias: 'string'
                },
                'double-quoted-string': {
                        pattern: /"[^\\"]*(?:\\[\s\S][^\\"]*)*"/,
                        greedy: true,
                        alias: 'string',
                        inside: {
                                'variable': {
                                        pattern: /\$(?:[a-z]\w*(?:\.(?:\d+|\$?[a-z]\w*))*)/i
                                }
                        }
                }
        });

        // The different types of TT2 strings "replace" the C-like standard string
        delete Prism.languages.tt2.string;

        Prism.hooks.add('before-tokenize', function (env) {
                var tt2Pattern = /\[%[\s\S]+?%\]/g;
                Prism.languages['markup-templating'].buildPlaceholders(env, 'tt2', tt2Pattern);
        });

        Prism.hooks.add('after-tokenize', function (env) {
                Prism.languages['markup-templating'].tokenizePlaceholders(env, 'tt2');
        });

}(Prism));