Highlighted code blocks inside the app (#1153)

app/MindWork AI Studio/Tools/CodeHighlighting/CodeHighlighters.cs

@@ -0,0 +1,56 @@
+using System.Collections.Frozen;
+using System.Diagnostics.CodeAnalysis;
+
+using AIStudio.Tools.CodeHighlighting.Languages;
+
+namespace AIStudio.Tools.CodeHighlighting;
+
+/// <summary>
+/// The languages AI Studio highlights itself, beyond those MudBlazor.Markdown highlights.
+/// </summary>
+/// <remarks>
+/// MudBlazor.Markdown highlights C#, Go, Kotlin, Razor, Rust, JSON, XML, and YAML. Its highlighter is
+/// internal, so the languages models write just as often, such as Python, get rules of their own here.
+/// A language is found by the name SourceCodeLanguages gives it, which already knows all the aliases
+/// models write behind the fence, such as py or Python3.
+/// </remarks>
+public static class CodeHighlighters
+{
+    private static readonly FrozenDictionary<string, CodeLanguageRules> RULES_BY_LANGUAGE = new Dictionary<string, CodeLanguageRules>(StringComparer.Ordinal)
+    {
+        ["C"] = CppCodeRules.RULES,
+        ["C++"] = CppCodeRules.RULES,
+        ["CSS"] = CssCodeRules.RULES,
+        ["Java"] = JavaCodeRules.RULES,
+        ["JavaScript"] = JavaScriptCodeRules.RULES,
+        ["JSX"] = JavaScriptCodeRules.RULES,
+        ["Lua"] = LuaCodeRules.RULES,
+        ["PowerShell"] = PowerShellCodeRules.RULES,
+        ["Python"] = PythonCodeRules.RULES,
+        ["Shell"] = ShellCodeRules.RULES,
+        ["SQL"] = SqlCodeRules.RULES,
+        ["TSX"] = TypeScriptCodeRules.RULES,
+        ["TypeScript"] = TypeScriptCodeRules.RULES,
+    }.ToFrozenDictionary(StringComparer.Ordinal);
+
+    /// <summary>
+    /// The names of the languages AI Studio highlights itself, as SourceCodeLanguages names them.
+    /// </summary>
+    internal static IEnumerable<string> LanguageNames => RULES_BY_LANGUAGE.Keys;
+
+    /// <summary>
+    /// Finds the rules for the language a model names behind the opening fence of a code block.
+    /// </summary>
+    /// <param name="fenceLanguage">The language behind the opening fence, as Markdig reads it.</param>
+    /// <param name="rules">The rules of the language, when AI Studio highlights it itself.</param>
+    /// <returns>Whether AI Studio highlights the language itself. Otherwise, MudBlazor.Markdown renders the
+    /// block, highlighted when it knows the language.</returns>
+    public static bool TryGetRules(string? fenceLanguage, [NotNullWhen(true)] out CodeLanguageRules? rules)
+    {
+        rules = null;
+        if (string.IsNullOrWhiteSpace(fenceLanguage))
+            return false;
+
+        return RULES_BY_LANGUAGE.TryGetValue(SourceCodeLanguages.FromCodeFenceLanguage(fenceLanguage).Name, out rules);
+    }
+}