add support for system.drawing.font

Author: lofcz

FastCloner.Contrib/ContribTypeHandlers.cs

@@ -0,0 +1,35 @@
+using System.Drawing;
+using FastCloner.Code;
+
+namespace FastCloner.Contrib;
+
+public static class ContribTypeHandlers
+{
+    private static bool registered;
+    
+    public static void Register()
+    {
+        if (registered)
+        {
+            return;
+        }
+
+        registered = true;
+        
+        FastClonerExprGenerator.CustomTypeHandlers.TryAdd(
+            typeof(Font), 
+            ProcessFont
+        );
+    }
+
+    private static object ProcessFont(Type type, bool unboxStruct, FastClonerExprGenerator.ExpressionPosition position)
+    {
+        return (Func<object, FastCloneState, object>)((obj, state) =>
+        {
+            Font font = (Font)obj;
+            Font result = (Font)font.Clone();
+            state.AddKnownRef(obj, result);
+            return result;
+        });
+    }
+}

FastCloner.Contrib/FastCloner.Contrib.csproj

@@ -0,0 +1,34 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+        <LangVersion>preview</LangVersion>
+        <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+        <Title>Special types support for FastCloner</Title>
+        <Description>Extends FastCloner with support for certain special types.</Description>
+        <Copyright>Matěj Štágl</Copyright>
+        <PackageProjectUrl>git</PackageProjectUrl>
+        <PackageIcon>icon.jpg</PackageIcon>
+        <RepositoryUrl>https://github.com/lofcz/FastCloner</RepositoryUrl>
+        <RepositoryType>git</RepositoryType>
+        <PackageTags>fastcloner,clone,deepclone,replicate,duplicate</PackageTags>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\FastCloner\FastCloner.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="System.Drawing.Common" Version="[8.0.3,)" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <None Update="icon.jpg">
+        <Pack>true</Pack>
+        <PackagePath></PackagePath>
+      </None>
+    </ItemGroup>
+
+</Project>

FastCloner.Contrib/icon.jpg

@@ -52,6 +52,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\FastCloner.Contrib\FastCloner.Contrib.csproj" />
     <ProjectReference Include="..\FastCloner\FastCloner.csproj" />
   </ItemGroup>
 

FastCloner.Tests/FastCloner.Tests.csproj

@@ -10,13 +10,20 @@
 using System.Net;
 using System.Net.Http.Headers;
 using System.Text;
+using FastCloner.Contrib;
 using Microsoft.EntityFrameworkCore;
 
 namespace FastCloner.Tests;
 
 [TestFixture]
 public class SpecificScenariosTest
 {
+    [OneTimeSetUp]
+    public void Setup()
+    {
+        ContribTypeHandlers.Register();
+    }
+    
     [Test]
     public void Test_ExpressionTree_OrderBy1()
     {
@@ -456,6 +463,30 @@ public void HttpResponse_Clone()
         });
     }
 
+    [Test]
+    [Platform("win")]
+    public void Font_Clone()
+    {
+        // Arrange
+        Font original = new Font("Arial", 12, FontStyle.Bold | FontStyle.Italic);
+
+        // Act
+        Font? cloned = FastCloner.DeepClone(original);
+    
+        // Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(cloned, Is.Not.SameAs(original), "Should be different instance");
+            Assert.That(cloned.Name, Is.EqualTo("Arial"), "Font name should be copied");
+            Assert.That(cloned.Size, Is.EqualTo(12), "Font size should be copied");
+            Assert.That(cloned.Style, Is.EqualTo(FontStyle.Bold | FontStyle.Italic), "Font style should be copied");
+            Assert.That(cloned.Unit, Is.EqualTo(original.Unit), "Font unit should be copied");
+            Assert.That(cloned.GdiCharSet, Is.EqualTo(original.GdiCharSet), "GDI charset should be copied");
+            Assert.That(cloned.GdiVerticalFont, Is.EqualTo(original.GdiVerticalFont), "GDI vertical font should be copied");
+        });
+    }
+
+    
     [Test]
     public void HttpRequest_With_StreamContent_Clone()
     {

FastCloner.Tests/SpecificScenariosTest.cs

@@ -12,6 +12,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FastCloner", "FastCloner\Fa
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FastCloner.Tests", "FastCloner.Tests\FastCloner.Tests.csproj", "{873A4571-F5B5-4C35-B8A9-335664473194}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FastCloner.Contrib", "FastCloner.Contrib\FastCloner.Contrib.csproj", "{3CB1B8F0-332F-4B5F-90A4-D8523956B22F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -26,6 +28,10 @@ Global
 		{873A4571-F5B5-4C35-B8A9-335664473194}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{873A4571-F5B5-4C35-B8A9-335664473194}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{873A4571-F5B5-4C35-B8A9-335664473194}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3CB1B8F0-332F-4B5F-90A4-D8523956B22F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3CB1B8F0-332F-4B5F-90A4-D8523956B22F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3CB1B8F0-332F-4B5F-90A4-D8523956B22F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3CB1B8F0-332F-4B5F-90A4-D8523956B22F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

FastCloner.sln

@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
 
 [assembly: InternalsVisibleTo("FastCloner.Tests")]
+[assembly: InternalsVisibleTo("FastCloner.Contrib")]
 namespace FastCloner;

FastCloner/AssemblyInfo.cs

@@ -9,6 +9,8 @@ namespace FastCloner.Code;
 
 internal static class FastClonerExprGenerator
 {
+    internal static readonly ConcurrentDictionary<Type, Func<Type, bool, ExpressionPosition, object>> CustomTypeHandlers = [];
+    
     private static readonly ConcurrentDictionary<FieldInfo, bool> _readonlyFields = new ConcurrentDictionary<FieldInfo, bool>();
 
     private static readonly MethodInfo _fieldSetMethod;
@@ -39,7 +41,7 @@ internal static void ForceSetField(FieldInfo field, object obj, object value)
         }
     }
 
-    private readonly record struct ExpressionPosition(int Depth, int Index)
+    internal readonly record struct ExpressionPosition(int Depth, int Index)
     {
         public ExpressionPosition Next() => this with { Index = Index + 1 };
         public ExpressionPosition Nested() => new ExpressionPosition(Depth + 1, 0);
@@ -62,7 +64,7 @@ private static LabelTarget CreateLoopLabel(ExpressionPosition position)
         {
             [typeof(ExpandoObject)] = (_, _, position) => GenerateExpandoObjectProcessor(position),
             [typeof(HttpRequestOptions)] = (_, _, position) => GenerateHttpRequestOptionsProcessor(position),
-            [typeof(Array)] = (type, _, _) => GenerateProcessArrayMethod(type)
+            [typeof(Array)] = (type, _, _) => GenerateProcessArrayMethod(type),
         }.ToFrozenDictionary();
 
     private static object GenerateProcessMethod(Type type, bool unboxStruct, ExpressionPosition position)
@@ -71,6 +73,11 @@ private static object GenerateProcessMethod(Type type, bool unboxStruct, Express
         {
             return handler.Invoke(type, unboxStruct, position);
         }
+
+        if (CustomTypeHandlers.TryGetValue(type, out Func<Type, bool, ExpressionPosition, object>? contribHandler))
+        {
+            return contribHandler.Invoke(type, unboxStruct, position);
+        }
 
         if (IsDictionaryType(type))
         {

FastCloner/Code/BadTypes.cs

@@ -0,0 +1,6 @@
+namespace FastCloner.Code;
+
+internal interface IFastClonerTypeRegistry
+{
+    void RegisterTypeHandler(Type type, object handler);
+}