Add: NestedNotAllow DiagnosticDescriptor

Alchemy.SourceGenerator/AlchemySerializeGenerator.cs

@@ -32,7 +32,13 @@ namespace Alchemy.SourceGenerator
                     if (!IsPartial(typeSyntax))
                     {
                         context.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.MustBePartial, typeSyntax.Identifier.GetLocation(), typeSymbol.Name));
-                        return;
+                        continue;
+                    }
+
+                    if (IsNested(typeSyntax))
+                    {
+                        context.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.NestedNotAllow, typeSyntax.Identifier.GetLocation(), typeSymbol.Name));
+                        continue;
                     }
 
                     var fieldSymbols = new List<IFieldSymbol>();
@@ -171,6 +177,11 @@ catch (global::System.Exception ex)
             return typeDeclaration.Modifiers.Any(m => m.IsKind(SyntaxKind.PartialKeyword));
         }
 
+        static bool IsNested(TypeDeclarationSyntax typeDeclaration)
+        {
+            return typeDeclaration.Parent is TypeDeclarationSyntax;
+        }
+
         sealed class SyntaxReceiver : ISyntaxReceiver
         {
             internal static ISyntaxReceiver Create()

Alchemy.SourceGenerator/DiagnosticDescriptors.cs

@@ -9,10 +9,19 @@ namespace Alchemy.SourceGenerator
         public static readonly DiagnosticDescriptor MustBePartial = new(
             id: "ALCHEMY001",
             title: "AlchemySerialize class must be partial.",
-            messageFormat: "AlchemySerialize class '{0}' must be partial",
+            messageFormat: "AlchemySerialize class '{0}' must be partial.",
             category: Category,
             defaultSeverity: DiagnosticSeverity.Error,
             isEnabledByDefault: true
         );
+
+        public static readonly DiagnosticDescriptor NestedNotAllow = new(
+            id: "ALCHEMY002",
+            title: "AlchemySerialize class must not be nested type.",
+            messageFormat: "The AlchemySerialize class '{0}' must be not nested type.",
+            category: Category,
+            defaultSeverity: DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+
     }
 }