C#: Generate signal event with the same accessibility as the delegate

Author: raulsntos

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

@@ -155,6 +155,32 @@ public static string GetDeclarationKeyword(this INamedTypeSymbol namedTypeSymbol
             };
         }
 
+        public static string GetAccessibilityKeyword(this INamedTypeSymbol namedTypeSymbol)
+        {
+            if (namedTypeSymbol.DeclaredAccessibility == Accessibility.NotApplicable)
+            {
+                // Accessibility not specified. Get the default accessibility.
+                return namedTypeSymbol.ContainingSymbol switch
+                {
+                    null or INamespaceSymbol => "internal",
+                    ITypeSymbol { TypeKind: TypeKind.Class or TypeKind.Struct } => "private",
+                    ITypeSymbol { TypeKind: TypeKind.Interface } => "public",
+                    _ => "",
+                };
+            }
+
+            return namedTypeSymbol.DeclaredAccessibility switch
+            {
+                Accessibility.Private => "private",
+                Accessibility.Protected => "protected",
+                Accessibility.Internal => "internal",
+                Accessibility.ProtectedAndInternal => "private",
+                Accessibility.ProtectedOrInternal => "private",
+                Accessibility.Public => "public",
+                _ => "",
+            };
+        }
+
         public static string NameWithTypeParameters(this INamedTypeSymbol symbol)
         {
             return symbol.IsGenericType ?

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

@@ -276,7 +276,7 @@ void AppendPartialContainingTypeDeclarations(INamedTypeSymbol? containingType)
                 source.Append(
                     $"    /// <inheritdoc cref=\"{signalDelegate.DelegateSymbol.FullQualifiedNameIncludeGlobal()}\"/>\n");
 
-                source.Append("    public event ")
+                source.Append($"    {signalDelegate.DelegateSymbol.GetAccessibilityKeyword()} event ")
                     .Append(signalDelegate.DelegateSymbol.FullQualifiedNameIncludeGlobal())
                     .Append(" @")
                     .Append(signalName)