Locally add prismjs
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node_modules/prismjs/components/prism-cshtml.js
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node_modules/prismjs/components/prism-cshtml.js
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// Docs:
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// https://docs.microsoft.com/en-us/aspnet/core/razor-pages/?view=aspnetcore-5.0&tabs=visual-studio
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// https://docs.microsoft.com/en-us/aspnet/core/mvc/views/razor?view=aspnetcore-5.0
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(function (Prism) {
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var commentLike = /\/(?![/*])|\/\/.*[\r\n]|\/\*[^*]*(?:\*(?!\/)[^*]*)*\*\//.source;
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var stringLike =
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/@(?!")|"(?:[^\r\n\\"]|\\.)*"|@"(?:[^\\"]|""|\\[\s\S])*"(?!")/.source +
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'|' +
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/'(?:(?:[^\r\n'\\]|\\.|\\[Uux][\da-fA-F]{1,8})'|(?=[^\\](?!')))/.source;
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/**
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* Creates a nested pattern where all occurrences of the string `<<self>>` are replaced with the pattern itself.
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*
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* @param {string} pattern
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* @param {number} depthLog2
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* @returns {string}
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*/
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function nested(pattern, depthLog2) {
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for (var i = 0; i < depthLog2; i++) {
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pattern = pattern.replace(/<self>/g, function () { return '(?:' + pattern + ')'; });
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}
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return pattern
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.replace(/<self>/g, '[^\\s\\S]')
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.replace(/<str>/g, '(?:' + stringLike + ')')
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.replace(/<comment>/g, '(?:' + commentLike + ')');
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}
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var round = nested(/\((?:[^()'"@/]|<str>|<comment>|<self>)*\)/.source, 2);
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var square = nested(/\[(?:[^\[\]'"@/]|<str>|<comment>|<self>)*\]/.source, 1);
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var curly = nested(/\{(?:[^{}'"@/]|<str>|<comment>|<self>)*\}/.source, 2);
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var angle = nested(/<(?:[^<>'"@/]|<comment>|<self>)*>/.source, 1);
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var inlineCs = /@/.source +
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/(?:await\b\s*)?/.source +
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'(?:' + /(?!await\b)\w+\b/.source + '|' + round + ')' +
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'(?:' + /[?!]?\.\w+\b/.source + '|' + '(?:' + angle + ')?' + round + '|' + square + ')*' +
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/(?![?!\.(\[]|<(?!\/))/.source;
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// Note about the above bracket patterns:
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// They all ignore HTML expressions that might be in the C# code. This is a problem because HTML (like strings and
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// comments) is parsed differently. This is a huge problem because HTML might contain brackets and quotes which
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// messes up the bracket and string counting implemented by the above patterns.
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//
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// This problem is not fixable because 1) HTML expression are highly context sensitive and very difficult to detect
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// and 2) they require one capturing group at every nested level. See the `tagRegion` pattern to admire the
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// complexity of an HTML expression.
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//
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// To somewhat alleviate the problem a bit, the patterns for characters (e.g. 'a') is very permissive, it also
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// allows invalid characters to support HTML expressions like this: <p>That's it!</p>.
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var tagAttrInlineCs = /@(?![\w()])/.source + '|' + inlineCs;
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var tagAttrValue = '(?:' +
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/"[^"@]*"|'[^'@]*'|[^\s'"@>=]+(?=[\s>])/.source +
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'|' +
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'["\'][^"\'@]*(?:(?:' + tagAttrInlineCs + ')[^"\'@]*)+["\']' +
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')';
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var tagAttrs = /(?:\s(?:\s*[^\s>\/=]+(?:\s*=\s*<tagAttrValue>|(?=[\s/>])))+)?/.source.replace(/<tagAttrValue>/, tagAttrValue);
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var tagContent = /(?!\d)[^\s>\/=$<%]+/.source + tagAttrs + /\s*\/?>/.source;
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var tagRegion =
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/\B@?/.source +
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'(?:' +
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/<([a-zA-Z][\w:]*)/.source + tagAttrs + /\s*>/.source +
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'(?:' +
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(
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/[^<]/.source +
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'|' +
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// all tags that are not the start tag
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// eslint-disable-next-line regexp/strict
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/<\/?(?!\1\b)/.source + tagContent +
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'|' +
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// nested start tag
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nested(
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// eslint-disable-next-line regexp/strict
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/<\1/.source + tagAttrs + /\s*>/.source +
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'(?:' +
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(
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/[^<]/.source +
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'|' +
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// all tags that are not the start tag
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// eslint-disable-next-line regexp/strict
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/<\/?(?!\1\b)/.source + tagContent +
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'|' +
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'<self>'
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) +
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')*' +
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// eslint-disable-next-line regexp/strict
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/<\/\1\s*>/.source,
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2
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)
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) +
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')*' +
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// eslint-disable-next-line regexp/strict
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/<\/\1\s*>/.source +
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'|' +
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/</.source + tagContent +
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')';
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// Now for the actual language definition(s):
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//
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// Razor as a language has 2 parts:
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// 1) CSHTML: A markup-like language that has been extended with inline C# code expressions and blocks.
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// 2) C#+HTML: A variant of C# that can contain CSHTML tags as expressions.
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//
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// In the below code, both CSHTML and C#+HTML will be create as separate language definitions that reference each
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// other. However, only CSHTML will be exported via `Prism.languages`.
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Prism.languages.cshtml = Prism.languages.extend('markup', {});
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var csharpWithHtml = Prism.languages.insertBefore('csharp', 'string', {
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'html': {
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pattern: RegExp(tagRegion),
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greedy: true,
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inside: Prism.languages.cshtml
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},
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}, { csharp: Prism.languages.extend('csharp', {}) });
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var cs = {
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pattern: /\S[\s\S]*/,
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alias: 'language-csharp',
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inside: csharpWithHtml
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};
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var inlineValue = {
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pattern: RegExp(/(^|[^@])/.source + inlineCs),
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lookbehind: true,
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greedy: true,
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alias: 'variable',
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inside: {
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'keyword': /^@/,
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'csharp': cs
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}
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};
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Prism.languages.cshtml.tag.pattern = RegExp(/<\/?/.source + tagContent);
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Prism.languages.cshtml.tag.inside['attr-value'].pattern = RegExp(/=\s*/.source + tagAttrValue);
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Prism.languages.insertBefore('inside', 'punctuation', { 'value': inlineValue }, Prism.languages.cshtml.tag.inside['attr-value']);
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Prism.languages.insertBefore('cshtml', 'prolog', {
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'razor-comment': {
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pattern: /@\*[\s\S]*?\*@/,
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greedy: true,
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alias: 'comment'
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},
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'block': {
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pattern: RegExp(
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/(^|[^@])@/.source +
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'(?:' +
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[
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// @{ ... }
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curly,
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// @code{ ... }
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/(?:code|functions)\s*/.source + curly,
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// @for (...) { ... }
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/(?:for|foreach|lock|switch|using|while)\s*/.source + round + /\s*/.source + curly,
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// @do { ... } while (...);
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/do\s*/.source + curly + /\s*while\s*/.source + round + /(?:\s*;)?/.source,
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// @try { ... } catch (...) { ... } finally { ... }
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/try\s*/.source + curly + /\s*catch\s*/.source + round + /\s*/.source + curly + /\s*finally\s*/.source + curly,
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// @if (...) {...} else if (...) {...} else {...}
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/if\s*/.source + round + /\s*/.source + curly + '(?:' + /\s*else/.source + '(?:' + /\s+if\s*/.source + round + ')?' + /\s*/.source + curly + ')*',
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// @helper Ident(params) { ... }
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/helper\s+\w+\s*/.source + round + /\s*/.source + curly,
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].join('|') +
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')'
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),
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lookbehind: true,
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greedy: true,
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inside: {
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'keyword': /^@\w*/,
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'csharp': cs
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}
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},
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'directive': {
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pattern: /^([ \t]*)@(?:addTagHelper|attribute|implements|inherits|inject|layout|model|namespace|page|preservewhitespace|removeTagHelper|section|tagHelperPrefix|using)(?=\s).*/m,
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lookbehind: true,
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greedy: true,
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inside: {
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'keyword': /^@\w+/,
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'csharp': cs
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}
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},
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'value': inlineValue,
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'delegate-operator': {
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pattern: /(^|[^@])@(?=<)/,
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lookbehind: true,
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alias: 'operator'
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}
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});
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Prism.languages.razor = Prism.languages.cshtml;
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}(Prism));
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