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* Add JSON source generator * Address review feedback * Address review feedback * Align project structure with src-gen conventions * Fix enum (de)serialization
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,21 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System; | ||
| using System.Collections.Generic; | ||
| using System.Text; | ||
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| namespace System.Text.Json.SourceGeneration | ||
| { | ||
| internal enum ClassType | ||
| { | ||
| TypeUnsupportedBySourceGen = 0, | ||
| Object = 1, | ||
| KnownType = 2, | ||
| TypeWithDesignTimeProvidedCustomConverter = 3, | ||
| Enumerable = 4, | ||
| Dictionary = 5, | ||
| Nullable = 6, | ||
| Enum = 7, | ||
| } | ||
| } |
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| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System; | ||
| using System.Collections.Generic; | ||
| using System.Text; | ||
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| namespace System.Text.Json.SourceGeneration | ||
| { | ||
| internal enum CollectionType | ||
| { | ||
| NotApplicable = 0, | ||
| Array = 1, | ||
| List = 2, | ||
| IEnumerable = 3, | ||
| IList = 4, | ||
| Dictionary = 5 | ||
| } | ||
| } |
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| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| namespace System.Runtime.CompilerServices | ||
| { | ||
| /// <summary> | ||
| /// Dummy class so C# init-only properties can compile on NetStandard. | ||
| /// </summary> | ||
| internal sealed class IsExternalInit { } | ||
| } |
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src/libraries/System.Text.Json/gen/JsonSerializableSyntaxReceiver.cs
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| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System.Collections.Generic; | ||
| using Microsoft.CodeAnalysis; | ||
| using Microsoft.CodeAnalysis.CSharp.Syntax; | ||
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| namespace System.Text.Json.SourceGeneration | ||
| { | ||
| internal sealed class JsonSerializableSyntaxReceiver : ISyntaxReceiver | ||
| { | ||
| public List<CompilationUnitSyntax> CompilationUnits { get; } = new(); | ||
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| public void OnVisitSyntaxNode(SyntaxNode syntaxNode) | ||
| { | ||
| if (syntaxNode is CompilationUnitSyntax compilationUnit) | ||
| { | ||
| CompilationUnits.Add(compilationUnit); | ||
| } | ||
| } | ||
| } | ||
| } |
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src/libraries/System.Text.Json/gen/JsonSourceGenerator.cs
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| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| using System.Text.Json.SourceGeneration.Reflection; | ||
| using Microsoft.CodeAnalysis; | ||
| using Microsoft.CodeAnalysis.CSharp; | ||
| using Microsoft.CodeAnalysis.CSharp.Syntax; | ||
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| namespace System.Text.Json.SourceGeneration | ||
| { | ||
| /// <summary> | ||
| /// Generates source code to optimize serialization and deserialization with JsonSerializer. | ||
| /// </summary> | ||
| [Generator] | ||
| public sealed class JsonSourceGenerator : ISourceGenerator | ||
| { | ||
| private JsonSourceGeneratorHelper? _helper; | ||
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| /// <summary> | ||
| /// Helper for unit tests. | ||
| /// </summary> | ||
| public Dictionary<string, Type>? SerializableTypes => _helper.GetSerializableTypes(); | ||
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| /// <summary> | ||
| /// Registers a syntax resolver to receive compilation units. | ||
| /// </summary> | ||
| /// <param name="context"></param> | ||
| public void Initialize(GeneratorInitializationContext context) | ||
| { | ||
| context.RegisterForSyntaxNotifications(() => new JsonSerializableSyntaxReceiver()); | ||
| } | ||
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| /// <summary> | ||
| /// Generates source code to optimize serialization and deserialization with JsonSerializer. | ||
| /// </summary> | ||
| /// <param name="executionContext"></param> | ||
| public void Execute(GeneratorExecutionContext executionContext) | ||
| { | ||
| Compilation compilation = executionContext.Compilation; | ||
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| const string JsonSerializableAttributeName = "System.Text.Json.Serialization.JsonSerializableAttribute"; | ||
| INamedTypeSymbol jsonSerializableAttribute = compilation.GetTypeByMetadataName(JsonSerializableAttributeName); | ||
| if (jsonSerializableAttribute == null) | ||
| { | ||
| return; | ||
| } | ||
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| JsonSerializableSyntaxReceiver receiver = (JsonSerializableSyntaxReceiver)executionContext.SyntaxReceiver; | ||
| MetadataLoadContextInternal metadataLoadContext = new(compilation); | ||
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| TypeExtensions.NullableOfTType = metadataLoadContext.Resolve(typeof(Nullable<>)); | ||
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| JsonSourceGeneratorHelper helper = new(executionContext, metadataLoadContext); | ||
| _helper = helper; | ||
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| // Discover serializable types indicated by JsonSerializableAttribute. | ||
| foreach (CompilationUnitSyntax compilationUnit in receiver.CompilationUnits) | ||
| { | ||
| SemanticModel compilationSemanticModel = executionContext.Compilation.GetSemanticModel(compilationUnit.SyntaxTree); | ||
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| foreach (AttributeListSyntax attributeListSyntax in compilationUnit.AttributeLists) | ||
| { | ||
| AttributeSyntax attributeSyntax = attributeListSyntax.Attributes.First(); | ||
| IMethodSymbol attributeSymbol = compilationSemanticModel.GetSymbolInfo(attributeSyntax).Symbol as IMethodSymbol; | ||
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| if (attributeSymbol == null || !jsonSerializableAttribute.Equals(attributeSymbol.ContainingType, SymbolEqualityComparer.Default)) | ||
| { | ||
| // Not the right attribute. | ||
| continue; | ||
| } | ||
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| // Get JsonSerializableAttribute arguments. | ||
| IEnumerable<SyntaxNode> attributeArguments = attributeSyntax.DescendantNodes().Where(node => node is AttributeArgumentSyntax); | ||
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| ITypeSymbol? typeSymbol = null; | ||
| string? typeInfoPropertyName = null; | ||
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| int i = 0; | ||
| foreach (AttributeArgumentSyntax node in attributeArguments) | ||
| { | ||
| if (i == 0) | ||
| { | ||
| TypeOfExpressionSyntax? typeNode = node.ChildNodes().Single() as TypeOfExpressionSyntax; | ||
| if (typeNode != null) | ||
| { | ||
| ExpressionSyntax typeNameSyntax = (ExpressionSyntax)typeNode.ChildNodes().Single(); | ||
| typeSymbol = compilationSemanticModel.GetTypeInfo(typeNameSyntax).ConvertedType; | ||
| } | ||
| } | ||
| else if (i == 1) | ||
| { | ||
| // Obtain the optional TypeInfoPropertyName string property on the attribute, if present. | ||
| SyntaxNode? typeInfoPropertyNameNode = node.ChildNodes().ElementAtOrDefault(1); | ||
| if (typeInfoPropertyNameNode != null) | ||
| { | ||
| typeInfoPropertyName = typeInfoPropertyNameNode.GetFirstToken().ValueText; | ||
| } | ||
| } | ||
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| i++; | ||
| } | ||
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| if (typeSymbol == null) | ||
| { | ||
| continue; | ||
| } | ||
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| Type type = new TypeWrapper(typeSymbol, metadataLoadContext); | ||
| if (type.Namespace == "<global namespace>") | ||
| { | ||
| // typeof() reference where the type's name isn't fully qualified. | ||
| // The compilation is not valid and the user needs to fix their code. | ||
| // The compiler will notify the user so we don't have to. | ||
| return; | ||
| } | ||
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| helper.RegisterRootSerializableType(type, typeInfoPropertyName); | ||
| } | ||
| } | ||
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| helper.GenerateSerializationMetadata(); | ||
| } | ||
| } | ||
| } |
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so this is the root of all evil
just kidding