From a98b5ea6fe8e8cc98a55e0fd793e6e8660ea31c1 Mon Sep 17 00:00:00 2001
From: Armand Philippot <git@armandphilippot.com>
Date: Thu, 30 Dec 2021 19:47:21 +0100
Subject: chore: add prismjs for syntax highlighting

---
 public/prism/prism-cshtml.js | 234 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 234 insertions(+)
 create mode 100644 public/prism/prism-cshtml.js

(limited to 'public/prism/prism-cshtml.js')

diff --git a/public/prism/prism-cshtml.js b/public/prism/prism-cshtml.js
new file mode 100644
index 0000000..df73bac
--- /dev/null
+++ b/public/prism/prism-cshtml.js
@@ -0,0 +1,234 @@
+// Docs:
+// https://docs.microsoft.com/en-us/aspnet/core/razor-pages/?view=aspnetcore-5.0&tabs=visual-studio
+// https://docs.microsoft.com/en-us/aspnet/core/mvc/views/razor?view=aspnetcore-5.0
+
+(function (Prism) {
+  var commentLike = /\/(?![/*])|\/\/.*[\r\n]|\/\*[^*]*(?:\*(?!\/)[^*]*)*\*\//
+    .source;
+  var stringLike =
+    /@(?!")|"(?:[^\r\n\\"]|\\.)*"|@"(?:[^\\"]|""|\\[\s\S])*"(?!")/.source +
+    '|' +
+    /'(?:(?:[^\r\n'\\]|\\.|\\[Uux][\da-fA-F]{1,8})'|(?=[^\\](?!')))/.source;
+
+  /**
+   * Creates a nested pattern where all occurrences of the string `<<self>>` are replaced with the pattern itself.
+   *
+   * @param {string} pattern
+   * @param {number} depthLog2
+   * @returns {string}
+   */
+  function nested(pattern, depthLog2) {
+    for (var i = 0; i < depthLog2; i++) {
+      pattern = pattern.replace(/<self>/g, function () {
+        return '(?:' + pattern + ')';
+      });
+    }
+    return pattern
+      .replace(/<self>/g, '[^\\s\\S]')
+      .replace(/<str>/g, '(?:' + stringLike + ')')
+      .replace(/<comment>/g, '(?:' + commentLike + ')');
+  }
+
+  var round = nested(/\((?:[^()'"@/]|<str>|<comment>|<self>)*\)/.source, 2);
+  var square = nested(/\[(?:[^\[\]'"@/]|<str>|<comment>|<self>)*\]/.source, 2);
+  var curly = nested(/\{(?:[^{}'"@/]|<str>|<comment>|<self>)*\}/.source, 2);
+  var angle = nested(/<(?:[^<>'"@/]|<str>|<comment>|<self>)*>/.source, 2);
+
+  // Note about the above bracket patterns:
+  // They all ignore HTML expressions that might be in the C# code. This is a problem because HTML (like strings and
+  // comments) is parsed differently. This is a huge problem because HTML might contain brackets and quotes which
+  // messes up the bracket and string counting implemented by the above patterns.
+  //
+  // This problem is not fixable because 1) HTML expression are highly context sensitive and very difficult to detect
+  // and 2) they require one capturing group at every nested level. See the `tagRegion` pattern to admire the
+  // complexity of an HTML expression.
+  //
+  // To somewhat alleviate the problem a bit, the patterns for characters (e.g. 'a') is very permissive, it also
+  // allows invalid characters to support HTML expressions like this: <p>That's it!</p>.
+
+  var tagAttrs =
+    /(?:\s(?:\s*[^\s>\/=]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))|(?=[\s/>])))+)?/
+      .source;
+  var tagContent = /(?!\d)[^\s>\/=$<%]+/.source + tagAttrs + /\s*\/?>/.source;
+  var tagRegion =
+    /\B@?/.source +
+    '(?:' +
+    /<([a-zA-Z][\w:]*)/.source +
+    tagAttrs +
+    /\s*>/.source +
+    '(?:' +
+    (/[^<]/.source +
+      '|' +
+      // all tags that are not the start tag
+      // eslint-disable-next-line regexp/strict
+      /<\/?(?!\1\b)/.source +
+      tagContent +
+      '|' +
+      // nested start tag
+      nested(
+        // eslint-disable-next-line regexp/strict
+        /<\1/.source +
+          tagAttrs +
+          /\s*>/.source +
+          '(?:' +
+          (/[^<]/.source +
+            '|' +
+            // all tags that are not the start tag
+            // eslint-disable-next-line regexp/strict
+            /<\/?(?!\1\b)/.source +
+            tagContent +
+            '|' +
+            '<self>') +
+          ')*' +
+          // eslint-disable-next-line regexp/strict
+          /<\/\1\s*>/.source,
+        2
+      )) +
+    ')*' +
+    // eslint-disable-next-line regexp/strict
+    /<\/\1\s*>/.source +
+    '|' +
+    /</.source +
+    tagContent +
+    ')';
+
+  // Now for the actual language definition(s):
+  //
+  // Razor as a language has 2 parts:
+  //  1) CSHTML: A markup-like language that has been extended with inline C# code expressions and blocks.
+  //  2) C#+HTML: A variant of C# that can contain CSHTML tags as expressions.
+  //
+  // In the below code, both CSHTML and C#+HTML will be create as separate language definitions that reference each
+  // other. However, only CSHTML will be exported via `Prism.languages`.
+
+  Prism.languages.cshtml = Prism.languages.extend('markup', {});
+
+  var csharpWithHtml = Prism.languages.insertBefore(
+    'csharp',
+    'string',
+    {
+      html: {
+        pattern: RegExp(tagRegion),
+        greedy: true,
+        inside: Prism.languages.cshtml,
+      },
+    },
+    { csharp: Prism.languages.extend('csharp', {}) }
+  );
+
+  var cs = {
+    pattern: /\S[\s\S]*/,
+    alias: 'language-csharp',
+    inside: csharpWithHtml,
+  };
+
+  Prism.languages.insertBefore('cshtml', 'prolog', {
+    'razor-comment': {
+      pattern: /@\*[\s\S]*?\*@/,
+      greedy: true,
+      alias: 'comment',
+    },
+
+    block: {
+      pattern: RegExp(
+        /(^|[^@])@/.source +
+          '(?:' +
+          [
+            // @{ ... }
+            curly,
+            // @code{ ... }
+            /(?:code|functions)\s*/.source + curly,
+            // @for (...) { ... }
+            /(?:for|foreach|lock|switch|using|while)\s*/.source +
+              round +
+              /\s*/.source +
+              curly,
+            // @do { ... } while (...);
+            /do\s*/.source +
+              curly +
+              /\s*while\s*/.source +
+              round +
+              /(?:\s*;)?/.source,
+            // @try { ... } catch (...) { ... } finally { ... }
+            /try\s*/.source +
+              curly +
+              /\s*catch\s*/.source +
+              round +
+              /\s*/.source +
+              curly +
+              /\s*finally\s*/.source +
+              curly,
+            // @if (...) {...} else if (...) {...} else {...}
+            /if\s*/.source +
+              round +
+              /\s*/.source +
+              curly +
+              '(?:' +
+              /\s*else/.source +
+              '(?:' +
+              /\s+if\s*/.source +
+              round +
+              ')?' +
+              /\s*/.source +
+              curly +
+              ')*',
+          ].join('|') +
+          ')'
+      ),
+      lookbehind: true,
+      greedy: true,
+      inside: {
+        keyword: /^@\w*/,
+        csharp: cs,
+      },
+    },
+
+    directive: {
+      pattern:
+        /^([ \t]*)@(?:addTagHelper|attribute|implements|inherits|inject|layout|model|namespace|page|preservewhitespace|removeTagHelper|section|tagHelperPrefix|using)(?=\s).*/m,
+      lookbehind: true,
+      greedy: true,
+      inside: {
+        keyword: /^@\w+/,
+        csharp: cs,
+      },
+    },
+
+    value: {
+      pattern: RegExp(
+        /(^|[^@])@/.source +
+          /(?:await\b\s*)?/.source +
+          '(?:' +
+          /\w+\b/.source +
+          '|' +
+          round +
+          ')' +
+          '(?:' +
+          /[?!]?\.\w+\b/.source +
+          '|' +
+          round +
+          '|' +
+          square +
+          '|' +
+          angle +
+          round +
+          ')*'
+      ),
+      lookbehind: true,
+      greedy: true,
+      alias: 'variable',
+      inside: {
+        keyword: /^@/,
+        csharp: cs,
+      },
+    },
+
+    'delegate-operator': {
+      pattern: /(^|[^@])@(?=<)/,
+      lookbehind: true,
+      alias: 'operator',
+    },
+  });
+
+  Prism.languages.razor = Prism.languages.cshtml;
+})(Prism);
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