Switch to lighter handler type detection in dapper

src/StructId.Analyzer/DapperGenerator.cs

@@ -1,7 +1,8 @@
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Globalization;
 using System.Linq;
-using System.Reflection.Metadata.Ecma335;
+using System.Threading;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Scriban;
@@ -62,8 +63,14 @@ protected override IncrementalValuesProvider<TemplateArgs> OnInitialize(Incremen
                     // Consider templatized handlers that will be emitted as custom handlers too for registration.
                     if (templated != null)
                     {
-                        var compilation = args.KnownTypes.Compilation.AddSyntaxTrees(templated.Syntax.SyntaxTree);
-                        handler = compilation.Assembly.GetAllTypes().FirstOrDefault(x => x.Name == templated.TypeName);
+                        var identifier = templated.Template.Syntax.ApplyValue(templated.TValue)
+                           .DescendantNodes()
+                           .OfType<TypeDeclarationSyntax>()
+                           .First()
+                           .Identifier.Text;
+
+                        // Use lighter symbol since our template rendering only uses the type name.
+                        handler = new KnownTypeNameSymbol(identifier);
                     }
                 }
 
@@ -152,4 +159,169 @@ record SelectorModel(
         IEnumerable<StructIdCustomModel> CustomIds,
         IEnumerable<ValueHandlerModel> CustomValues,
         IEnumerable<ValueHandlerModelCode> TemplatizedValueHandlers);
+
+#pragma warning disable RS1009 // Only internal implementations of this interface are allowed
+    class KnownTypeNameSymbol(string typeName) : INamedTypeSymbol
+#pragma warning restore RS1009 // Only internal implementations of this interface are allowed
+    {
+        public string Name => typeName;
+        public string ToDisplayString(SymbolDisplayFormat? format = null) => typeName;
+
+        public int Arity => throw new System.NotImplementedException();
+
+        public bool IsGenericType => throw new System.NotImplementedException();
+
+        public bool IsUnboundGenericType => throw new System.NotImplementedException();
+
+        public bool IsScriptClass => throw new System.NotImplementedException();
+
+        public bool IsImplicitClass => throw new System.NotImplementedException();
+
+        public bool IsComImport => throw new System.NotImplementedException();
+
+        public bool IsFileLocal => throw new System.NotImplementedException();
+
+        public IEnumerable<string> MemberNames => throw new System.NotImplementedException();
+
+        public ImmutableArray<ITypeParameterSymbol> TypeParameters => throw new System.NotImplementedException();
+
+        public ImmutableArray<ITypeSymbol> TypeArguments => throw new System.NotImplementedException();
+
+        public ImmutableArray<NullableAnnotation> TypeArgumentNullableAnnotations => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol OriginalDefinition => throw new System.NotImplementedException();
+
+        public IMethodSymbol? DelegateInvokeMethod => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol? EnumUnderlyingType => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol ConstructedFrom => throw new System.NotImplementedException();
+
+        public ImmutableArray<IMethodSymbol> InstanceConstructors => throw new System.NotImplementedException();
+
+        public ImmutableArray<IMethodSymbol> StaticConstructors => throw new System.NotImplementedException();
+
+        public ImmutableArray<IMethodSymbol> Constructors => throw new System.NotImplementedException();
+
+        public ISymbol? AssociatedSymbol => throw new System.NotImplementedException();
+
+        public bool MightContainExtensionMethods => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol? TupleUnderlyingType => throw new System.NotImplementedException();
+
+        public ImmutableArray<IFieldSymbol> TupleElements => throw new System.NotImplementedException();
+
+        public bool IsSerializable => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol? NativeIntegerUnderlyingType => throw new System.NotImplementedException();
+
+        public TypeKind TypeKind => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol? BaseType => throw new System.NotImplementedException();
+
+        public ImmutableArray<INamedTypeSymbol> Interfaces => throw new System.NotImplementedException();
+
+        public ImmutableArray<INamedTypeSymbol> AllInterfaces => throw new System.NotImplementedException();
+
+        public bool IsReferenceType => throw new System.NotImplementedException();
+
+        public bool IsValueType => throw new System.NotImplementedException();
+
+        public bool IsAnonymousType => throw new System.NotImplementedException();
+
+        public bool IsTupleType => throw new System.NotImplementedException();
+
+        public bool IsNativeIntegerType => throw new System.NotImplementedException();
+
+        public SpecialType SpecialType => throw new System.NotImplementedException();
+
+        public bool IsRefLikeType => throw new System.NotImplementedException();
+
+        public bool IsUnmanagedType => throw new System.NotImplementedException();
+
+        public bool IsReadOnly => throw new System.NotImplementedException();
+
+        public bool IsRecord => throw new System.NotImplementedException();
+
+        public NullableAnnotation NullableAnnotation => throw new System.NotImplementedException();
+
+        public bool IsNamespace => throw new System.NotImplementedException();
+
+        public bool IsType => throw new System.NotImplementedException();
+
+        public SymbolKind Kind => throw new System.NotImplementedException();
+
+        public string Language => throw new System.NotImplementedException();
+
+        public string MetadataName => throw new System.NotImplementedException();
+
+        public int MetadataToken => throw new System.NotImplementedException();
+
+        public ISymbol ContainingSymbol => throw new System.NotImplementedException();
+
+        public IAssemblySymbol ContainingAssembly => throw new System.NotImplementedException();
+
+        public IModuleSymbol ContainingModule => throw new System.NotImplementedException();
+
+        public INamedTypeSymbol ContainingType => throw new System.NotImplementedException();
+
+        public INamespaceSymbol ContainingNamespace => throw new System.NotImplementedException();
+
+        public bool IsDefinition => throw new System.NotImplementedException();
+
+        public bool IsStatic => throw new System.NotImplementedException();
+
+        public bool IsVirtual => throw new System.NotImplementedException();
+
+        public bool IsOverride => throw new System.NotImplementedException();
+
+        public bool IsAbstract => throw new System.NotImplementedException();
+
+        public bool IsSealed => throw new System.NotImplementedException();
+
+        public bool IsExtern => throw new System.NotImplementedException();
+
+        public bool IsImplicitlyDeclared => throw new System.NotImplementedException();
+
+        public bool CanBeReferencedByName => throw new System.NotImplementedException();
+
+        public ImmutableArray<Location> Locations => throw new System.NotImplementedException();
+
+        public ImmutableArray<SyntaxReference> DeclaringSyntaxReferences => throw new System.NotImplementedException();
+
+        public Accessibility DeclaredAccessibility => throw new System.NotImplementedException();
+
+        public bool HasUnsupportedMetadata => throw new System.NotImplementedException();
+
+        ITypeSymbol ITypeSymbol.OriginalDefinition => throw new System.NotImplementedException();
+
+        ISymbol ISymbol.OriginalDefinition => throw new System.NotImplementedException();
+
+        public void Accept(SymbolVisitor visitor) => throw new System.NotImplementedException();
+        public TResult? Accept<TResult>(SymbolVisitor<TResult> visitor) => throw new System.NotImplementedException();
+        public TResult Accept<TArgument, TResult>(SymbolVisitor<TArgument, TResult> visitor, TArgument argument) => throw new System.NotImplementedException();
+        public INamedTypeSymbol Construct(params ITypeSymbol[] typeArguments) => throw new System.NotImplementedException();
+        public INamedTypeSymbol Construct(ImmutableArray<ITypeSymbol> typeArguments, ImmutableArray<NullableAnnotation> typeArgumentNullableAnnotations) => throw new System.NotImplementedException();
+        public INamedTypeSymbol ConstructUnboundGenericType() => throw new System.NotImplementedException();
+        public bool Equals(ISymbol? other, SymbolEqualityComparer equalityComparer) => throw new System.NotImplementedException();
+        public bool Equals(ISymbol? other) => throw new System.NotImplementedException();
+        public ISymbol? FindImplementationForInterfaceMember(ISymbol interfaceMember) => throw new System.NotImplementedException();
+        public ImmutableArray<AttributeData> GetAttributes() => throw new System.NotImplementedException();
+        public string? GetDocumentationCommentId() => throw new System.NotImplementedException();
+        public string? GetDocumentationCommentXml(CultureInfo? preferredCulture = null, bool expandIncludes = false, CancellationToken cancellationToken = default) => throw new System.NotImplementedException();
+        public ImmutableArray<ISymbol> GetMembers() => throw new System.NotImplementedException();
+        public ImmutableArray<ISymbol> GetMembers(string name) => throw new System.NotImplementedException();
+        public ImmutableArray<CustomModifier> GetTypeArgumentCustomModifiers(int ordinal) => throw new System.NotImplementedException();
+        public ImmutableArray<INamedTypeSymbol> GetTypeMembers() => throw new System.NotImplementedException();
+        public ImmutableArray<INamedTypeSymbol> GetTypeMembers(string name) => throw new System.NotImplementedException();
+        public ImmutableArray<INamedTypeSymbol> GetTypeMembers(string name, int arity) => throw new System.NotImplementedException();
+        public ImmutableArray<SymbolDisplayPart> ToDisplayParts(NullableFlowState topLevelNullability, SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public ImmutableArray<SymbolDisplayPart> ToDisplayParts(SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public string ToDisplayString(NullableFlowState topLevelNullability, SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public ImmutableArray<SymbolDisplayPart> ToMinimalDisplayParts(SemanticModel semanticModel, NullableFlowState topLevelNullability, int position, SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public ImmutableArray<SymbolDisplayPart> ToMinimalDisplayParts(SemanticModel semanticModel, int position, SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public string ToMinimalDisplayString(SemanticModel semanticModel, NullableFlowState topLevelNullability, int position, SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public string ToMinimalDisplayString(SemanticModel semanticModel, int position, SymbolDisplayFormat? format = null) => throw new System.NotImplementedException();
+        public ITypeSymbol WithNullableAnnotation(NullableAnnotation nullableAnnotation) => throw new System.NotImplementedException();
+    }
 }