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// Author: Simon.Gockner |
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// Created: 2025-12-01 |
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// Copyright(c) 2025 SimonG. All Rights Reserved. |
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using System.Collections.Immutable; |
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using System.Text; |
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using Microsoft.CodeAnalysis; |
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using Microsoft.CodeAnalysis.CSharp; |
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using Microsoft.CodeAnalysis.CSharp.Syntax; |
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namespace LightweightIocContainer.FactoryGenerator; |
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[Generator] |
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public class FactoryGenerator : IIncrementalGenerator |
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{ |
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private const string EXTENSION_CLASS_NAME = "FactoryExtensions"; |
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private const string BUILDER_CLASS_NAME = "GeneratedFactoryBuilder"; |
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private const string GENERATED_FILE_HEADER = "//---GENERATED by FactoryGenerator! DO NOT EDIT!---"; |
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private const string INDENT = " "; |
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public void Initialize(IncrementalGeneratorInitializationContext context) |
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{ |
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string? classNamespace = typeof(FactoryGenerator).Namespace; |
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context.RegisterPostInitializationOutput(c => c.AddSource($"{EXTENSION_CLASS_NAME}.g.cs", GenerateFactoryExtensionsClass(classNamespace, EXTENSION_CLASS_NAME))); |
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IncrementalValuesProvider<ITypeSymbol?> syntaxProvider = context.SyntaxProvider.CreateSyntaxProvider(IsCallToGenerateFactory, GetTypeArgument); |
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context.RegisterSourceOutput(syntaxProvider.Collect(), GenerateTypeDependentClasses); |
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} |
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private string GenerateFactoryExtensionsClass(string? classNamespace, string className) |
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{ |
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StringBuilder stringBuilder = new(); |
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stringBuilder.AppendLine(GENERATED_FILE_HEADER); |
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stringBuilder.AppendLine(); |
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stringBuilder.AppendLine("using LightweightIocContainer.Interfaces.Registrations;"); |
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stringBuilder.AppendLine("using LightweightIocContainer.Interfaces.Registrations.Fluent;"); |
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stringBuilder.AppendLine("using LightweightIocContainer.Registrations;"); |
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stringBuilder.AppendLine(); |
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if (!string.IsNullOrEmpty(classNamespace)) |
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{ |
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stringBuilder.AppendLine($"namespace {classNamespace};"); |
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stringBuilder.AppendLine(); |
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} |
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stringBuilder.AppendLine($"public static class {className}");; |
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stringBuilder.AppendLine("{"); |
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stringBuilder.AppendLine($"{INDENT}public static IRegistrationBase WithGeneratedFactory<TFactory>(this IRegistrationBase registration)"); |
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stringBuilder.AppendLine($"{INDENT}{{"); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}TFactory factory = Builder.Create<TFactory>();"); |
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stringBuilder.AppendLine(); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}if (registration is not RegistrationBase registrationBase)"); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}{INDENT}throw new InvalidOperationException(\"The registration must be of type RegistrationBase to add a generated factory.\");"); |
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stringBuilder.AppendLine(); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}registrationBase.AddGeneratedFactory<TFactory>(factory);"); |
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stringBuilder.AppendLine(); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}return registrationBase;"); |
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stringBuilder.AppendLine($"{INDENT}}}"); |
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stringBuilder.AppendLine("}"); |
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return stringBuilder.ToString(); |
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} |
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private bool IsCallToGenerateFactory(SyntaxNode node, CancellationToken cancellationToken) |
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{ |
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if (!node.IsKind(SyntaxKind.GenericName) || node is not GenericNameSyntax genericNameSyntax) |
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return false; |
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if (!genericNameSyntax.ToString().StartsWith("WithGeneratedFactory")) |
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return false; |
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if (genericNameSyntax.TypeArgumentList.Arguments[0] is not IdentifierNameSyntax) |
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return false; |
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return true; |
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} |
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private ITypeSymbol? GetTypeArgument(GeneratorSyntaxContext syntaxContext, CancellationToken cancellationToken) |
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{ |
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if (syntaxContext.Node is not GenericNameSyntax genericNameSyntax) |
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return null; |
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if (genericNameSyntax.TypeArgumentList.Arguments[0] is not IdentifierNameSyntax identifierNameSyntax) |
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return null; |
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if (syntaxContext.SemanticModel.GetSymbolInfo(identifierNameSyntax).Symbol is not ITypeSymbol typeSymbol) |
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return null; |
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return typeSymbol; |
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} |
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private void GenerateTypeDependentClasses(SourceProductionContext context, ImmutableArray<ITypeSymbol?> types) |
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{ |
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string? classNamespace = typeof(FactoryGenerator).Namespace; |
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context.AddSource($"{BUILDER_CLASS_NAME}.g.cs", GenerateBuilderClassSourceCode(classNamespace, types)); |
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} |
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private string GenerateBuilderClassSourceCode(string? classNamespace, ImmutableArray<ITypeSymbol?> types) |
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{ |
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StringBuilder stringBuilder = new(); |
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stringBuilder.AppendLine(GENERATED_FILE_HEADER); |
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stringBuilder.AppendLine(); |
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foreach (string typeNamespace in GetNamespacesOfTypes(types)) |
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stringBuilder.AppendLine($"using {typeNamespace};"); |
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stringBuilder.AppendLine(); |
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if (classNamespace is not null) |
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{ |
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stringBuilder.AppendLine($"namespace {classNamespace};"); |
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stringBuilder.AppendLine(); |
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} |
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stringBuilder.AppendLine("public static class Builder"); |
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stringBuilder.AppendLine("{"); |
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stringBuilder.AppendLine($"{INDENT}public static TFactory Create<TFactory>()"); |
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stringBuilder.AppendLine($"{INDENT}{{"); |
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foreach (ITypeSymbol? type in types) |
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{ |
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if (type is null) |
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continue; |
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stringBuilder.AppendLine($"{INDENT}{INDENT}if (typeof(TFactory) == typeof({type.Name}))"); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}{{"); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}{INDENT}return (TFactory) (object) new Generated{type.Name}();"); |
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stringBuilder.AppendLine($"{INDENT}{INDENT}}}"); |
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stringBuilder.AppendLine(); |
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} |
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stringBuilder.AppendLine($"{INDENT}{INDENT}throw new Exception(\"Invalid type.\");"); |
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stringBuilder.AppendLine($"{INDENT}}}"); |
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stringBuilder.AppendLine("}"); |
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return stringBuilder.ToString(); |
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} |
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private IEnumerable<string> GetNamespacesOfTypes(ImmutableArray<ITypeSymbol?> types) => |
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types.OfType<ITypeSymbol>() |
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.Select(s => s.ContainingNamespace.IsGlobalNamespace ? null : s.ContainingNamespace.ToString()) |
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.OfType<string>() |
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.Distinct(); |
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} |
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