Switch to incremental source generator API

Author: bkoelman

package-versions.props

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <!-- Published dependencies (only update on major version change) -->
-    <CodeAnalysisFrozenVersion>4.1.0</CodeAnalysisFrozenVersion>
+    <CodeAnalysisFrozenVersion>4.13.0</CodeAnalysisFrozenVersion>
     <DemystifierFrozenVersion>0.4.1</DemystifierFrozenVersion>
     <HumanizerFrozenVersion>2.14.1</HumanizerFrozenVersion>
     <NewtonsoftJsonFrozenVersion>13.0.4</NewtonsoftJsonFrozenVersion>
@@ -24,6 +24,7 @@
     <MiniValidationVersion>0.9.*</MiniValidationVersion>
     <NSwagApiClientVersion>14.6.*</NSwagApiClientVersion>
     <NewtonsoftJsonVersion>13.0.*</NewtonsoftJsonVersion>
+    <PolyfillVersion>8.8.*</PolyfillVersion>
     <ReadableExpressionsVersion>4.1.*</ReadableExpressionsVersion>
     <ScalarAspNetCoreVersion>2.9.*</ScalarAspNetCoreVersion>
     <SwashbuckleVersion>9.*-*</SwashbuckleVersion>

src/JsonApiDotNetCore.SourceGenerators/ControllerSourceGenerator.cs

@@ -0,0 +1,33 @@
+using Microsoft.CodeAnalysis;
+
+namespace JsonApiDotNetCore.SourceGenerators;
+
+/// <summary>
+/// Basic outcome from the code analysis.
+/// </summary>
+internal readonly record struct CoreControllerInfo(
+    TypeInfo ResourceType, TypeInfo IdType, string ControllerNamespace, JsonApiEndpointsCopy Endpoints, bool WriteNullableEnable)
+{
+    // Using readonly fields, so they can be passed by reference (using 'in' modifier, to avoid making copies) during code generation.
+    public readonly TypeInfo ResourceType = ResourceType;
+    public readonly TypeInfo IdType = IdType;
+    public readonly string ControllerNamespace = ControllerNamespace;
+    public readonly JsonApiEndpointsCopy Endpoints = Endpoints;
+    public readonly bool WriteNullableEnable = WriteNullableEnable;
+
+    public static CoreControllerInfo? TryCreate(INamedTypeSymbol resourceTypeSymbol, ITypeSymbol idTypeSymbol, JsonApiEndpointsCopy endpoints,
+        string controllerNamespace)
+    {
+        TypeInfo? resourceTypeInfo = TypeInfo.CreateFromQualified(resourceTypeSymbol);
+        TypeInfo? idTypeInfo = TypeInfo.TryCreateFromQualifiedOrPossiblyNullableKeyword(idTypeSymbol);
+
+        if (idTypeInfo == null)
+        {
+            return null;
+        }
+
+        bool writeNullableEnable = idTypeSymbol is { IsReferenceType: true, NullableAnnotation: NullableAnnotation.Annotated };
+
+        return new CoreControllerInfo(resourceTypeInfo.Value, idTypeInfo.Value, controllerNamespace, endpoints, writeNullableEnable);
+    }
+}

src/JsonApiDotNetCore.SourceGenerators/CoreControllerInfo.cs

@@ -0,0 +1,29 @@
+namespace JsonApiDotNetCore.SourceGenerators;
+
+/// <summary>
+/// Supplemental information that is derived from the core analysis, which is expensive to produce.
+/// </summary>
+internal readonly record struct FullControllerInfo(
+    CoreControllerInfo CoreController, TypeInfo ControllerType, TypeInfo LoggerFactoryInterface, string HintFileName)
+{
+    // Using readonly fields, so they can be passed by reference (using 'in' modifier, to avoid making copies) during code generation.
+    public readonly CoreControllerInfo CoreController = CoreController;
+    public readonly TypeInfo ControllerType = ControllerType;
+    public readonly TypeInfo LoggerFactoryInterface = LoggerFactoryInterface;
+    public readonly string HintFileName = HintFileName;
+
+    public static FullControllerInfo Create(CoreControllerInfo coreController, string controllerTypeName)
+    {
+        var controllerTypeInfo = new TypeInfo(coreController.ControllerNamespace, controllerTypeName);
+        var loggerFactoryTypeInfo = new TypeInfo("Microsoft.Extensions.Logging", "ILoggerFactory");
+
+        return new FullControllerInfo(coreController, controllerTypeInfo, loggerFactoryTypeInfo, controllerTypeName);
+    }
+
+    public FullControllerInfo WithHintFileName(string hintFileName)
+    {
+        // ReSharper disable once UseWithExpressionToCopyRecord
+        // Justification: Workaround for bug at https://youtrack.jetbrains.com/issue/RSRP-502017/Invalid-suggestion-to-use-with-expression.
+        return new FullControllerInfo(CoreController, ControllerType, LoggerFactoryInterface, hintFileName);
+    }
+}

src/JsonApiDotNetCore.SourceGenerators/FullControllerInfo.cs

@@ -0,0 +1,45 @@
+using System.Collections.Immutable;
+
+namespace JsonApiDotNetCore.SourceGenerators;
+
+// This type was copied from Roslyn. The implementation looks odd, but is likely a performance tradeoff.
+// Beware that the consuming code doesn't adhere to the typical pattern where a dictionary is built once, then queried many times.
+
+internal sealed class ImmutableDictionaryEqualityComparer<TKey, TValue> : IEqualityComparer<ImmutableDictionary<TKey, TValue>?>
+    where TKey : notnull
+{
+    public static readonly ImmutableDictionaryEqualityComparer<TKey, TValue> Instance = new();
+
+    public bool Equals(ImmutableDictionary<TKey, TValue>? x, ImmutableDictionary<TKey, TValue>? y)
+    {
+        if (ReferenceEquals(x, y))
+        {
+            return true;
+        }
+
+        if (x is null || y is null)
+        {
+            return false;
+        }
+
+        if (!Equals(x.KeyComparer, y.KeyComparer) || !Equals(x.ValueComparer, y.ValueComparer))
+        {
+            return false;
+        }
+
+        foreach ((TKey key, TValue value) in x)
+        {
+            if (!y.TryGetValue(key, out TValue? other) || !x.ValueComparer.Equals(value, other))
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public int GetHashCode(ImmutableDictionary<TKey, TValue>? obj)
+    {
+        return obj?.Count ?? 0;
+    }
+}

src/JsonApiDotNetCore.SourceGenerators/ImmutableDictionaryEqualityComparer.cs

@@ -4,8 +4,9 @@
     <IsPackable>true</IsPackable>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <IncludeBuildOutput>false</IncludeBuildOutput>
-    <NoWarn>$(NoWarn);NU5128</NoWarn>
+    <NoWarn>$(NoWarn);NU5128;RS2008</NoWarn>
     <IsRoslynComponent>true</IsRoslynComponent>
+    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
   </PropertyGroup>
 
   <Import Project="..\..\package-versions.props" />
@@ -47,5 +48,6 @@
   <ItemGroup>
     <PackageReference Include="Humanizer.Core" Version="$(HumanizerFrozenVersion)" PrivateAssets="all" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(CodeAnalysisFrozenVersion)" PrivateAssets="all" />
+    <PackageReference Include="Polyfill" Version="$(PolyfillVersion)" PrivateAssets="all" />
   </ItemGroup>
 </Project>

src/JsonApiDotNetCore.SourceGenerators/JsonApiDotNetCore.SourceGenerators.csproj

@@ -0,0 +1,32 @@
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+
+namespace JsonApiDotNetCore.SourceGenerators;
+
+internal readonly record struct LocationInfo(string FilePath, TextSpan TextSpan, LinePositionSpan LineSpan)
+{
+    public static LocationInfo? CreateFrom(SyntaxNode node)
+    {
+        return CreateFrom(node.GetLocation());
+    }
+
+    private static LocationInfo? CreateFrom(Location location)
+    {
+        if (location.SourceTree is null)
+        {
+            return null;
+        }
+
+        return new LocationInfo(location.SourceTree.FilePath, location.SourceSpan, location.GetLineSpan().Span);
+    }
+
+    public Location ToLocation()
+    {
+        return Location.Create(FilePath, TextSpan, LineSpan);
+    }
+
+    public override string ToString()
+    {
+        return ToLocation().ToString();
+    }
+}

src/JsonApiDotNetCore.SourceGenerators/LocationInfo.cs

@@ -0,0 +1,3 @@
+namespace JsonApiDotNetCore.SourceGenerators;
+
+internal readonly record struct MissingInterfaceDiagnostic(string ResourceTypeName, LocationInfo? Location);

src/JsonApiDotNetCore.SourceGenerators/MissingInterfaceDiagnostic.cs

@@ -0,0 +1,19 @@
+namespace JsonApiDotNetCore.SourceGenerators;
+
+internal readonly record struct SemanticResult(CoreControllerInfo? CoreController, MissingInterfaceDiagnostic? Diagnostic)
+{
+    public override string ToString()
+    {
+        if (Diagnostic != null)
+        {
+            return "Diagnostic";
+        }
+
+        if (CoreController != null)
+        {
+            return "Controller";
+        }
+
+        return string.Empty;
+    }
+}