From d9c17720dcde03d8b3cdccee228b8e0414120f03 Mon Sep 17 00:00:00 2001
From: jackfiled <xcrenchangjun@outlook.com>
Date: Wed, 28 Aug 2024 20:26:41 +0800
Subject: [PATCH] dev: CSharp language highlight.

---
 .../CodeBlockPostRenderProcessor.cs           | 27 ++++++++++++++++++-
 .../Processors/Scanners/CSharpScanner.cs      |  9 +++++++
 YaeBlog.Core/YaeBlog.Core.csproj              |  2 ++
 3 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 YaeBlog.Core/Processors/Scanners/CSharpScanner.cs

diff --git a/YaeBlog.Core/Processors/CodeBlockPostRenderProcessor.cs b/YaeBlog.Core/Processors/CodeBlockPostRenderProcessor.cs
index 217aa38..2325c07 100644
--- a/YaeBlog.Core/Processors/CodeBlockPostRenderProcessor.cs
+++ b/YaeBlog.Core/Processors/CodeBlockPostRenderProcessor.cs
@@ -1,11 +1,12 @@
 using AngleSharp;
 using AngleSharp.Dom;
+using Microsoft.Extensions.Logging;
 using YaeBlog.Core.Abstractions;
 using YaeBlog.Core.Models;
 
 namespace YaeBlog.Core.Processors;
 
-public class CodeBlockPostRenderProcessor : IPostRenderProcessor
+public class CodeBlockPostRenderProcessor(ILogger<CodeBlockPostRenderProcessor> logger) : IPostRenderProcessor
 {
     public async Task<BlogEssay> ProcessAsync(BlogEssay essay)
     {
@@ -20,10 +21,34 @@ public class CodeBlockPostRenderProcessor : IPostRenderProcessor
         foreach (IElement element in preElements)
         {
             element.ClassList.Add("p-3 text-bg-secondary rounded-1");
+
+            IEnumerable<IElement> codeElements = from e in element.Children
+                where e.LocalName == "code"
+                    select e;
+
+            foreach (IElement code in codeElements)
+            {
+                string? language = (from c in code.ClassList
+                    where c.StartsWith("language-")
+                    select c[9..].ToLower()).FirstOrDefault();
+
+                if (language is null)
+                {
+                    continue;
+                }
+
+                logger.LogDebug("Detect code block of language {}.", language);
+                code.InnerHtml = HighLightCode(code.InnerHtml, language);
+            }
         }
 
         return essay.WithNewHtmlContent(document.DocumentElement.OuterHtml);
     }
 
     public string Name => nameof(CodeBlockPostRenderProcessor);
+
+    private static string HighLightCode(string code, string language)
+    {
+        return code;
+    }
 }
diff --git a/YaeBlog.Core/Processors/Scanners/CSharpScanner.cs b/YaeBlog.Core/Processors/Scanners/CSharpScanner.cs
new file mode 100644
index 0000000..c5923ef
--- /dev/null
+++ b/YaeBlog.Core/Processors/Scanners/CSharpScanner.cs
@@ -0,0 +1,9 @@
+using static LanguageExt.Prelude;
+
+
+namespace YaeBlog.Core.Processors.Scanners;
+
+public class CSharpScanner
+{
+
+}
diff --git a/YaeBlog.Core/YaeBlog.Core.csproj b/YaeBlog.Core/YaeBlog.Core.csproj
index ef44f03..00cb827 100644
--- a/YaeBlog.Core/YaeBlog.Core.csproj
+++ b/YaeBlog.Core/YaeBlog.Core.csproj
@@ -12,6 +12,8 @@
 
   <ItemGroup>
     <PackageReference Include="AngleSharp" Version="1.1.0" />
+    <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
+    <PackageReference Include="LanguageExt.Parsec" Version="4.4.9" />
     <PackageReference Include="Markdig" Version="0.34.0" />
     <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="8.0.6" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />