initial commit, 4.5 stable

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/GlobalClassAnalyzer.cs

@@ -0,0 +1,50 @@
+using System.Collections.Immutable;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.Diagnostics;
+
+namespace Godot.SourceGenerators
+{
+    [DiagnosticAnalyzer(LanguageNames.CSharp)]
+    public sealed class GlobalClassAnalyzer : DiagnosticAnalyzer
+    {
+        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics
+            => ImmutableArray.Create(
+                Common.GlobalClassMustDeriveFromGodotObjectRule,
+                Common.GlobalClassMustNotBeGenericRule);
+
+        public override void Initialize(AnalysisContext context)
+        {
+            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+            context.EnableConcurrentExecution();
+            context.RegisterSyntaxNodeAction(AnalyzeNode, SyntaxKind.ClassDeclaration);
+        }
+
+        private static void AnalyzeNode(SyntaxNodeAnalysisContext context)
+        {
+            // Return if not a type symbol or the type is not a global class.
+            if (context.ContainingSymbol is not INamedTypeSymbol typeSymbol ||
+                !typeSymbol.GetAttributes().Any(a => a.AttributeClass?.IsGodotGlobalClassAttribute() ?? false))
+                return;
+
+            if (typeSymbol.IsGenericType)
+            {
+                context.ReportDiagnostic(Diagnostic.Create(
+                    Common.GlobalClassMustNotBeGenericRule,
+                    typeSymbol.Locations.FirstLocationWithSourceTreeOrDefault(),
+                    typeSymbol.ToDisplayString()
+                ));
+            }
+
+            if (!typeSymbol.InheritsFrom("GodotSharp", GodotClasses.GodotObject))
+            {
+                context.ReportDiagnostic(Diagnostic.Create(
+                    Common.GlobalClassMustDeriveFromGodotObjectRule,
+                    typeSymbol.Locations.FirstLocationWithSourceTreeOrDefault(),
+                    typeSymbol.ToDisplayString()
+                ));
+            }
+        }
+    }
+}