fix: add fully qualified Names for method parameters, return types, new constructor call and generic types

src/Riok.Mapperly/Descriptors/Mappings/ArrayCloneMapping.cs

@@ -1,5 +1,6 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
 using static Riok.Mapperly.Emit.SyntaxFactoryHelper;
 
@@ -22,7 +23,7 @@ public ArrayCloneMapping(
     public override ExpressionSyntax Build(TypeMappingBuildContext ctx)
     {
         return CastExpression(
-            IdentifierName(TargetType.ToDisplayString()),
+            FullyQualifiedIdentifier(TargetType),
             InvocationExpression(MemberAccess(ctx.Source, CloneMethodName)));
     }
 }

src/Riok.Mapperly/Descriptors/Mappings/ArrayForMapping.cs

@@ -32,7 +32,7 @@ public override IEnumerable<StatementSyntax> BuildBody(TypeMappingBuildContext c
         // var target = new T[source.Length];
         var sourceLengthArrayRank = ArrayRankSpecifier(SingletonSeparatedList<ExpressionSyntax>(MemberAccess(ctx.Source, ArrayLengthProperty)));
         var targetInitializationValue = ArrayCreationExpression(
-            ArrayType(IdentifierName(_targetArrayElementType.ToDisplayString()))
+            ArrayType(FullyQualifiedIdentifier(_targetArrayElementType))
                 .WithRankSpecifiers(SingletonList(sourceLengthArrayRank)));
         yield return DeclareLocalVariable(targetVariableName, targetInitializationValue);
 

src/Riok.Mapperly/Descriptors/Mappings/CastMapping.cs

@@ -1,5 +1,7 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+using Riok.Mapperly.Emit;
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
 
 namespace Riok.Mapperly.Descriptors.Mappings;
@@ -22,6 +24,6 @@ public override ExpressionSyntax Build(TypeMappingBuildContext ctx)
         var objToCast = _delegateMapping != null
             ? _delegateMapping.Build(ctx)
             : ctx.Source;
-        return CastExpression(IdentifierName(TargetType.ToDisplayString()), objToCast);
+        return CastExpression(SyntaxFactoryHelper.FullyQualifiedIdentifier(TargetType), objToCast);
     }
 }

src/Riok.Mapperly/Descriptors/Mappings/CtorMapping.cs

@@ -1,6 +1,5 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Riok.Mapperly.Helpers;
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
 using static Riok.Mapperly.Emit.SyntaxFactoryHelper;
 
@@ -18,7 +17,7 @@ public CtorMapping(ITypeSymbol sourceType, ITypeSymbol targetType)
 
     public override ExpressionSyntax Build(TypeMappingBuildContext ctx)
     {
-        var type = IdentifierName(TargetType.NonNullable().ToDisplayString());
-        return ObjectCreationExpression(type).WithArgumentList(ArgumentList(ctx.Source));
+        return ObjectCreationExpression(FullyQualifiedIdentifier(TargetType)).WithArgumentList(ArgumentList(ctx.Source));
+
     }
 }

src/Riok.Mapperly/Descriptors/Mappings/EnumFromStringParseMapping.cs

@@ -38,15 +38,15 @@ public override ExpressionSyntax Build(TypeMappingBuildContext ctx)
             return GenericInvocation(
                 EnumClassName,
                 ParseMethodName,
-                new[] { IdentifierName(TargetType.ToDisplayString()) },
+                new[] { FullyQualifiedIdentifier(TargetType) },
                 ctx.Source,
                 BooleanLiteral(_ignoreCase));
         }
 
         // (TargetType)System.Enum.Parse(typeof(TargetType), source, ignoreCase)
         var enumParseInvocation = Invocation(
             MemberAccess(EnumClassName, ParseMethodName),
-            TypeOfExpression(IdentifierName(TargetType.ToDisplayString())), ctx.Source, BooleanLiteral(_ignoreCase));
-        return CastExpression(IdentifierName(TargetType.ToDisplayString()), enumParseInvocation);
+            TypeOfExpression(FullyQualifiedIdentifier(TargetType)), ctx.Source, BooleanLiteral(_ignoreCase));
+        return CastExpression(FullyQualifiedIdentifier(TargetType), enumParseInvocation);
     }
 }

src/Riok.Mapperly/Descriptors/Mappings/EnumFromStringSwitchMapping.cs

@@ -1,6 +1,8 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+
 using Riok.Mapperly.Helpers;
+
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
 using static Riok.Mapperly.Emit.SyntaxFactoryHelper;
 
@@ -68,7 +70,7 @@ private SwitchExpressionArmSyntax BuildArmIgnoreCase(string ignoreCaseSwitchDesi
 
         // source.Value1
         var typeMemberAccess = MemberAccess(
-            IdentifierName(field.ContainingType.WithNullableAnnotation(NullableAnnotation.None).ToDisplayString()),
+            FullyQualifiedIdentifierName(field.ContainingType.NonNullable()),
             field.Name);
 
         // when s.Equals(nameof(source.Value1), StringComparison.OrdinalIgnoreCase)
@@ -87,7 +89,7 @@ private SwitchExpressionArmSyntax BuildArm(IFieldSymbol field)
     {
         // nameof(source.Value1) => source.Value1;
         var typeMemberAccess = MemberAccess(
-            IdentifierName(field.ContainingType.NonNullable().ToDisplayString()),
+            FullyQualifiedIdentifier(field.ContainingType),
             field.Name);
         var pattern = ConstantPattern(NameOf(typeMemberAccess));
         return SwitchExpressionArm(pattern, typeMemberAccess);

src/Riok.Mapperly/Descriptors/Mappings/EnumNameMapping.cs

@@ -44,8 +44,8 @@ public override IEnumerable<StatementSyntax> BuildBody(TypeMappingBuildContext c
 
     private SwitchExpressionArmSyntax BuildArm(KeyValuePair<string, string> sourceTargetField)
     {
-        var sourceMember = MemberAccess(SourceType.ToDisplayString(), sourceTargetField.Key);
-        var targetMember = MemberAccess(TargetType.ToDisplayString(), sourceTargetField.Value);
+        var sourceMember = MemberAccess(FullyQualifiedIdentifier(SourceType), sourceTargetField.Key);
+        var targetMember = MemberAccess(FullyQualifiedIdentifier(TargetType), sourceTargetField.Value);
         var pattern = ConstantPattern(sourceMember);
         return SwitchExpressionArm(pattern, targetMember);
     }

src/Riok.Mapperly/Descriptors/Mappings/EnumToStringMapping.cs

@@ -1,6 +1,8 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+
 using Riok.Mapperly.Helpers;
+
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
 using static Riok.Mapperly.Emit.SyntaxFactoryHelper;
 
@@ -48,7 +50,7 @@ public override IEnumerable<StatementSyntax> BuildBody(TypeMappingBuildContext c
     private SwitchExpressionArmSyntax BuildArm(IFieldSymbol field)
     {
         var typeMemberAccess = MemberAccess(
-            IdentifierName(field.ContainingType.NonNullable().ToDisplayString()),
+            FullyQualifiedIdentifier(field.ContainingType.NonNullable()),
             field.Name);
         var pattern = ConstantPattern(typeMemberAccess);
         var nameOf = NameOf(typeMemberAccess);

src/Riok.Mapperly/Descriptors/Mappings/MethodMapping.cs

@@ -58,7 +58,7 @@ public MethodDeclarationSyntax BuildMethod(SourceEmitterContext ctx)
     {
         TypeSyntax returnType = ReturnType == null
             ? PredefinedType(Token(SyntaxKind.VoidKeyword))
-            : IdentifierName(TargetType.ToDisplayString());
+            : FullyQualifiedIdentifier(TargetType);
 
         var typeMappingBuildContext = new TypeMappingBuildContext(
             SourceParameter.Name,

src/Riok.Mapperly/Descriptors/Mappings/NullDelegateMapping.cs

@@ -47,7 +47,7 @@ public override ExpressionSyntax Build(TypeMappingBuildContext ctx)
             // if the target type is a nullable value type, there needs to be an additional cast in some cases
             // (eg. in a linq expression, int => int?)
             return TargetType.IsNullableValueType()
-                ? CastExpression(IdentifierName(TargetType.ToDisplayString()), _delegateMapping.Build(ctx))
+                ? CastExpression(FullyQualifiedIdentifier(TargetType), _delegateMapping.Build(ctx))
                 : _delegateMapping.Build(ctx);
         }
 

src/Riok.Mapperly/Descriptors/Mappings/UserImplementedMethodMapping.cs

@@ -33,7 +33,7 @@ public override ExpressionSyntax Build(TypeMappingBuildContext ctx)
         if (Method.ReceiverType?.TypeKind != TypeKind.Interface)
             return Invocation(Method.Name, _sourceParameter.WithArgument(ctx.Source), _referenceHandlerParameter?.WithArgument(ctx.ReferenceHandler));
 
-        var castedThis = CastExpression(IdentifierName(Method.ReceiverType!.ToDisplayString()), ThisExpression());
+        var castedThis = CastExpression(FullyQualifiedIdentifier(Method.ReceiverType!), ThisExpression());
         var method = MemberAccess(ParenthesizedExpression(castedThis), Method.Name);
         return Invocation(method, _sourceParameter.WithArgument(ctx.Source), _referenceHandlerParameter?.WithArgument(ctx.ReferenceHandler));
     }

src/Riok.Mapperly/Emit/ReferenceHandlingSyntaxFactoryHelper.cs

@@ -18,7 +18,7 @@ public static IfStatementSyntax TryGetReference(
         // GetReference<TSource, TTarget>
         var refHandler = ctx.ReferenceHandler ?? throw new ArgumentNullException(nameof(ctx.ReferenceHandler));
         var methodName = GenericName(Identifier(nameof(IReferenceHandler.TryGetReference)))
-            .WithTypeArgumentList(TypeArgumentList(IdentifierName(mapping.SourceType.ToDisplayString()), IdentifierName(mapping.TargetType.ToDisplayString())));
+            .WithTypeArgumentList(TypeArgumentList(FullyQualifiedIdentifier(mapping.SourceType), FullyQualifiedIdentifier(mapping.TargetType)));
         var method = MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, refHandler, methodName);
 
         // out var target
@@ -46,7 +46,7 @@ public static ExpressionSyntax SetReference(
         // SetReference<TSource, TTarget>
         var refHandler = ctx.ReferenceHandler ?? throw new ArgumentNullException(nameof(ctx.ReferenceHandler));
         var methodName = GenericName(Identifier(nameof(IReferenceHandler.SetReference)))
-            .WithTypeArgumentList(TypeArgumentList(IdentifierName(mapping.SourceType.ToDisplayString()), IdentifierName(mapping.TargetType.ToDisplayString())));
+            .WithTypeArgumentList(TypeArgumentList(FullyQualifiedIdentifier(mapping.SourceType), (FullyQualifiedIdentifier(mapping.TargetType))));
         var method = MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, refHandler, methodName);
 
         return Invocation(method, ctx.Source, target);

src/Riok.Mapperly/Emit/SyntaxFactoryHelper.cs

@@ -1,9 +1,11 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+
 using Riok.Mapperly.Descriptors.Mappings;
 using Riok.Mapperly.Helpers;
 using Riok.Mapperly.Symbols;
+
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
 
 namespace Riok.Mapperly.Emit;
@@ -17,7 +19,7 @@ public static class SyntaxFactoryHelper
     private const string NullReferenceExceptionClassName = "System.NullReferenceException";
 
     public static readonly IdentifierNameSyntax VarIdentifier = IdentifierName("var");
-
+    private static readonly SymbolDisplayFormat _fullyQualifiedNullableFormat = SymbolDisplayFormat.FullyQualifiedFormat.AddMiscellaneousOptions(SymbolDisplayMiscellaneousOptions.IncludeNullableReferenceTypeModifier);
     private static readonly IdentifierNameSyntax _nameofIdentifier = IdentifierName("nameof");
 
     public static SyntaxToken Accessibility(Accessibility accessibility)
@@ -103,8 +105,8 @@ public static LiteralExpressionSyntax DefaultLiteral()
     public static LiteralExpressionSyntax NullLiteral()
         => LiteralExpression(SyntaxKind.NullLiteralExpression);
 
-    public static LiteralExpressionSyntax StringLiteral(string content) =>
-        LiteralExpression(SyntaxKind.StringLiteralExpression, Literal(content));
+    public static LiteralExpressionSyntax StringLiteral(string content)
+        => LiteralExpression(SyntaxKind.StringLiteralExpression, Literal(content));
 
     public static LiteralExpressionSyntax BooleanLiteral(bool b)
         => LiteralExpression(b ? SyntaxKind.TrueLiteralExpression : SyntaxKind.FalseLiteralExpression);
@@ -215,7 +217,7 @@ public static ParameterListSyntax ParameterList(bool extensionMethod, params Met
     public static ParameterSyntax Parameter(bool addThisKeyword, MethodParameter parameter)
     {
         var param = SyntaxFactory.Parameter(Identifier(parameter.Name))
-            .WithType(IdentifierName(parameter.Type.ToDisplayString()));
+            .WithType(FullyQualifiedIdentifier(parameter.Type));
 
         if (addThisKeyword && parameter.Ordinal == 0)
         {
@@ -234,7 +236,7 @@ public static InvocationExpressionSyntax StaticInvocation(string receiverType, s
 
     public static InvocationExpressionSyntax StaticInvocation(IMethodSymbol method, params ExpressionSyntax[] arguments)
         => StaticInvocation(
-            method.ReceiverType?.NonNullable().ToDisplayString() ?? throw new ArgumentNullException(nameof(method.ReceiverType)),
+            FullyQualifiedIdentifierName(method.ReceiverType?.NonNullable()!) ?? throw new ArgumentNullException(nameof(method.ReceiverType)),
             method.Name,
             arguments);
 
@@ -323,7 +325,13 @@ public static SeparatedSyntaxList<T> CommaSeparatedList<T>(IEnumerable<T> nodes,
         => SeparatedList<T>(JoinByComma(nodes, insertTrailingComma));
 
     public static IdentifierNameSyntax NonNullableIdentifier(ITypeSymbol t)
-        => IdentifierName(t.NonNullable().ToDisplayString());
+        => FullyQualifiedIdentifier(t.NonNullable());
+
+    public static IdentifierNameSyntax FullyQualifiedIdentifier(ITypeSymbol typeSymbol)
+        => IdentifierName(FullyQualifiedIdentifierName(typeSymbol));
+
+    public static string FullyQualifiedIdentifierName(ITypeSymbol typeSymbol)
+        => typeSymbol.ToDisplayString(_fullyQualifiedNullableFormat);
 
     private static IEnumerable<SyntaxNodeOrToken> JoinByComma(IEnumerable<SyntaxNode> nodes, bool insertTrailingComma = false)
         => Join(Token(SyntaxKind.CommaToken), insertTrailingComma, nodes);

src/Riok.Mapperly/Helpers/SymbolExtensions.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 

test/Riok.Mapperly.IntegrationTests/_snapshots/NET_48/CircularReferenceMapperTest.SnapshotGeneratedSource.verified.cs

@@ -3,17 +3,17 @@ namespace Riok.Mapperly.IntegrationTests.Mapper
 {
     public static partial class CircularReferenceMapper
     {
-        public static partial Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto ToDto(Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject obj)
+        public static partial global::Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto ToDto(global::Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject obj)
         {
-            return MapToCircularReferenceDto(obj, new Riok.Mapperly.Abstractions.ReferenceHandling.Internal.PreserveReferenceHandler());
+            return MapToCircularReferenceDto(obj, new global::Riok.Mapperly.Abstractions.ReferenceHandling.Internal.PreserveReferenceHandler());
         }
 
-        private static Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto MapToCircularReferenceDto(Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject source, Riok.Mapperly.Abstractions.ReferenceHandling.IReferenceHandler refHandler)
+        private static global::Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto MapToCircularReferenceDto(global::Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject source, global::Riok.Mapperly.Abstractions.ReferenceHandling.IReferenceHandler refHandler)
         {
-            if (refHandler.TryGetReference<Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject, Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto>(source, out var existingTargetReference))
+            if (refHandler.TryGetReference<global::Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject, global::Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto>(source, out var existingTargetReference))
                 return existingTargetReference;
-            var target = new Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto();
-            refHandler.SetReference<Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject, Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto>(source, target);
+            var target = new global::Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto();
+            refHandler.SetReference<global::Riok.Mapperly.IntegrationTests.Models.CircularReferenceObject, global::Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto>(source, target);
             if (source.Parent != null)
             {
                 target.Parent = MapToCircularReferenceDto(source.Parent, refHandler);
@@ -23,4 +23,4 @@ private static Riok.Mapperly.IntegrationTests.Dto.CircularReferenceDto MapToCirc
             return target;
         }
     }
-}
+}