refactor: Extract Parser and Emitter to internal top-level classes

src/CompositeKey.SourceGeneration.UnitTests/CompilationHelper.cs

@@ -19,6 +19,7 @@ public sealed record SourceGeneratorResult
 public static class CompilationHelper
 {
     private static readonly Assembly SystemRuntimeAssembly = Assembly.Load(new AssemblyName("System.Runtime"));
+    private static readonly Assembly CompositeKeyAssembly = Assembly.Load(new AssemblyName("CompositeKey"));
 
     private static readonly CSharpParseOptions DefaultParseOptions = CreateParseOptions();
 
@@ -33,7 +34,7 @@ public static Compilation CreateCompilation(string source, string assemblyName =
             MetadataReference.CreateFromFile(typeof(Console).Assembly.Location),
             MetadataReference.CreateFromFile(SystemRuntimeAssembly.Location),
 
-            MetadataReference.CreateFromFile(typeof(CompositeKeyAttribute).Assembly.Location),
+            MetadataReference.CreateFromFile(CompositeKeyAssembly.Location),
         ];
 
         return CSharpCompilation.Create(

src/CompositeKey.SourceGeneration/CompositeKey.SourceGeneration.csproj

@@ -7,6 +7,9 @@
         <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
 
         <DefineConstants>$(DefineConstants);BUILDING_SOURCE_GENERATOR</DefineConstants>
+
+        <!-- Exclude PolySharp polyfills that conflict with runtime types when exposed via InternalsVisibleTo -->
+        <PolySharpExcludeGeneratedTypes>System.Runtime.CompilerServices.ModuleInitializerAttribute</PolySharpExcludeGeneratedTypes>
     </PropertyGroup>
 
     <ItemGroup>
@@ -26,6 +29,10 @@
         <ProjectReference Include="..\CompositeKey.Analyzers.Common\CompositeKey.Analyzers.Common.csproj" PrivateAssets="all" ReferenceOutputAssembly="true" GlobalPropertiesToRemove="TargetFramework" />
     </ItemGroup>
 
+    <ItemGroup>
+        <InternalsVisibleTo Include="CompositeKey.SourceGeneration.UnitTests" />
+    </ItemGroup>
+
     <ItemGroup>
         <Compile Include="..\CompositeKey\CompositeKeyAttribute.cs" Link="Common\CompositeKey\CompositeKeyAttribute.cs" />
         <Compile Include="..\CompositeKey\CompositeKeyConstructorAttribute.cs" Link="Common\CompositeKey\CompositeKeyConstructorAttribute.cs" />

src/CompositeKey.SourceGeneration/SourceGenerator.cs

@@ -7,8 +7,10 @@
 namespace CompositeKey.SourceGeneration;
 
 [Generator]
-public sealed partial class SourceGenerator : IIncrementalGenerator
+public sealed class SourceGenerator : IIncrementalGenerator
 {
+    private const string CompositeKeyAttributeFullName = "CompositeKey.CompositeKeyAttribute";
+
     public const string GenerationSpecTrackingName = nameof(GenerationSpec);
 
     public void Initialize(IncrementalGeneratorInitializationContext context)