source: node_modules/prismjs/components/prism-t4-templating.js

(function (Prism) {

        function createBlock(prefix, inside, contentAlias) {
                return {
                        pattern: RegExp('<#' + prefix + '[\\s\\S]*?#>'),
                        alias: 'block',
                        inside: {
                                'delimiter': {
                                        pattern: RegExp('^<#' + prefix + '|#>$'),
                                        alias: 'important'
                                },
                                'content': {
                                        pattern: /[\s\S]+/,
                                        inside: inside,
                                        alias: contentAlias
                                }
                        }
                };
        }

        function createT4(insideLang) {
                var grammar = Prism.languages[insideLang];
                var className = 'language-' + insideLang;

                return {
                        'block': {
                                pattern: /<#[\s\S]+?#>/,
                                inside: {
                                        'directive': createBlock('@', {
                                                'attr-value': {
                                                        pattern: /=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">=]+)/,
                                                        inside: {
                                                                'punctuation': /^=|^["']|["']$/
                                                        }
                                                },
                                                'keyword': /\b\w+(?=\s)/,
                                                'attr-name': /\b\w+/
                                        }),
                                        'expression': createBlock('=', grammar, className),
                                        'class-feature': createBlock('\\+', grammar, className),
                                        'standard': createBlock('', grammar, className)
                                }
                        }
                };
        }

        Prism.languages['t4-templating'] = Object.defineProperty({}, 'createT4', { value: createT4 });

}(Prism));