Migrate `BizHawk.SrcGen.*` to `IIncrementalGenerator`

ExternalProjects/BizHawk.SrcGen.ReflectionCache/ReflectionCacheGenerator.cs

@@ -7,9 +7,9 @@ using System.Text;
 using BizHawk.Analyzers;
 
 [Generator]
-public sealed class ReflectionCacheGenerator : ISourceGenerator
+public sealed class ReflectionCacheGenerator : IIncrementalGenerator
 {
-	private sealed class ReflectionCacheGenSyntaxReceiver : ISyntaxReceiver
+	private sealed class NamespaceInferrer
 	{
 		/// <remarks>
 		/// I may have just added RNG to the build process...
@@ -35,9 +35,9 @@ public sealed class ReflectionCacheGenerator : ISourceGenerator
 			return ns[ns.Length - 1] == '.' ? ns.Substring(0, ns.Length - 1) : ns; // trim trailing '.' (can't use BizHawk.Common from Source Generators)
 		}
 
-		public void OnVisitSyntaxNode(SyntaxNode syntaxNode)
+		public void AddSample(NamespaceDeclarationSyntax syn)
 		{
-			if (_namespace != null || syntaxNode is not NamespaceDeclarationSyntax syn) return;
+			if (_namespace is not null) return;
 			var newNS = syn.Name.ToMetadataNameStr();
 			if (!newNS.StartsWith("BizHawk.", StringComparison.Ordinal)) return;
 			_namespaces.Add(newNS);
@@ -45,13 +45,24 @@ public sealed class ReflectionCacheGenerator : ISourceGenerator
 		}
 	}
 
-	public void Initialize(GeneratorInitializationContext context)
-		=> context.RegisterForSyntaxNotifications(() => new ReflectionCacheGenSyntaxReceiver());
-
-	public void Execute(GeneratorExecutionContext context)
+	public void Initialize(IncrementalGeneratorInitializationContext context)
+	{
+		var nSpace = context.SyntaxProvider
+			.CreateSyntaxProvider(
+				predicate: static (syntaxNode, _) => syntaxNode is NamespaceDeclarationSyntax,
+				transform: static (ctx, _) => (NamespaceDeclarationSyntax) ctx.Node)
+			.Collect()
+			.Select((nsSyns, _) =>
+			{
+				NamespaceInferrer shim = new();
+				foreach (var syn in nsSyns) shim.AddSample(syn);
+				return shim.Namespace;
+			});
+		context.RegisterSourceOutput(nSpace, Execute);
+	}
+
+	public void Execute(SourceProductionContext context, string nSpace)
 	{
-		if (context.SyntaxReceiver is not ReflectionCacheGenSyntaxReceiver receiver) return;
-		var nSpace = receiver.Namespace;
 		var src = $@"#nullable enable
 
 using System;

ExternalProjects/BizHawk.SrcGen.SettingsUtil/BizHawk.SrcGen.SettingsUtil.csproj

@@ -3,4 +3,7 @@
 		<TargetFramework>netstandard2.0</TargetFramework>
 	</PropertyGroup>
 	<Import Project="../AnalyzersCommon.props" />
+	<PropertyGroup>
+		<NoWarn>$(NoWarn);SA1135</NoWarn> <!-- the Analyzer for SA1135 chokes on the tuple alias syntax -->
+	</PropertyGroup>
 </Project>

ExternalProjects/BizHawk.SrcGen.SettingsUtil/DefaultSetterGenerator.cs

@@ -1,31 +1,24 @@
 namespace BizHawk.SrcGen.SettingsUtil;
 
-using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
 using System.Text;
 
 using BizHawk.Analyzers;
 
+using TestType = (ClassDeclarationSyntax CDS, SemanticModel SemanticModel);
+
 [Generator]
-public class DefaultSetterGenerator : ISourceGenerator
+public class DefaultSetterGenerator : IIncrementalGenerator
 {
-	public class SyntaxReceiver : ISyntaxContextReceiver
+	public void Initialize(IncrementalGeneratorInitializationContext context)
 	{
-		public readonly List<(ClassDeclarationSyntax CDS, SemanticModel SemanticModel)> ClassDeclarations = new();
-
-		public void OnVisitSyntaxNode(GeneratorSyntaxContext context)
-		{
-			if (context.Node is ClassDeclarationSyntax cds)
-			{
-				ClassDeclarations.Add((cds, context.SemanticModel));
-			}
-		}
+		var classDecls = context.SyntaxProvider.CreateSyntaxProvider(
+			predicate: static (syntaxNode, _) => syntaxNode is ClassDeclarationSyntax,
+			transform: static (ctx, _) => ((ClassDeclarationSyntax) ctx.Node, ctx.SemanticModel));
+		context.RegisterSourceOutput(context.CompilationProvider.Combine(classDecls.Collect()), Execute);
 	}
 
-	public void Initialize(GeneratorInitializationContext context)
-		=> context.RegisterForSyntaxNotifications(() => new SyntaxReceiver());
-
 	private static void CreateDefaultSetter(StringBuilder source, INamespaceOrTypeSymbol symbol)
 	{
 		var props = symbol
@@ -78,13 +71,12 @@ public class DefaultSetterGenerator : ISourceGenerator
 ");
 	}
 
-	public void Execute(GeneratorExecutionContext context)
+	public void Execute(
+		SourceProductionContext context,
+		(Compilation Compilation, ImmutableArray<TestType> ClassDeclarations) value)
 	{
-		if (context.SyntaxContextReceiver is not SyntaxReceiver syntaxReceiver)
-		{
-			return;
-		}
-		var consumerAttrSym = context.Compilation.GetTypeByMetadataName("BizHawk.Emulation.Common.CoreSettingsAttribute");
+		var (compilation, classDeclarations) = value;
+		var consumerAttrSym = compilation.GetTypeByMetadataName("BizHawk.Emulation.Common.CoreSettingsAttribute");
 		if (consumerAttrSym is null) return;
 
 		// Generated source code
@@ -94,7 +86,7 @@ namespace BizHawk.Emulation.Cores
 	public static partial class SettingsUtil
 	{");
 
-		foreach (var (cds, semanticModel) in syntaxReceiver.ClassDeclarations
+		foreach (var (cds, semanticModel) in classDeclarations
 			.Where(tuple => tuple.CDS.AttributeLists.Matching(
 				consumerAttrSym,
 				tuple.SemanticModel,

ExternalProjects/BizHawk.SrcGen.VersionInfo/VersionInfoGenerator.cs

@@ -5,11 +5,10 @@ using System.IO;
 using System.Linq;
 
 [Generator]
-public class VersionInfoGenerator : ISourceGenerator
+public class VersionInfoGenerator : IIncrementalGenerator
 {
-	public void Initialize(GeneratorInitializationContext context)
-	{
-	}
+	public void Initialize(IncrementalGeneratorInitializationContext context)
+		=> context.RegisterSourceOutput(context.CompilationProvider, Execute);
 
 	private static string? ExecuteGitWithArguments(string arguments)
 	{
@@ -38,12 +37,14 @@ public class VersionInfoGenerator : ISourceGenerator
 #endif
 	}
 
-	public void Execute(GeneratorExecutionContext context)
+	public void Execute(SourceProductionContext context, Compilation compilation)
 	{
 		// Finds the current project directory in order to pass to git commands.
 		// This is written in a way to (hopefully) work both for build and IDE analyzers
 		// FIXME: This should probably be done in a better way, but I haven't found any
-		string projectDir = Path.GetDirectoryName(context.Compilation.SyntaxTrees.First(x => x.HasCompilationUnitRoot && x.FilePath.Contains("BizHawk.Common")).FilePath)!;
+		var projectDir = Path.GetDirectoryName(compilation.SyntaxTrees
+			.First(static x => x.HasCompilationUnitRoot && x.FilePath.Contains("BizHawk.Common"))
+			.FilePath)!;
 
 		var rev = ExecuteGitWithArguments($"-C {projectDir} rev-list HEAD --count") ?? string.Empty;
 		var branch = ExecuteGitWithArguments($"-C {projectDir} rev-parse --abbrev-ref HEAD") ?? "master";