fix: get mapper defaults for roslyn version smaller 4.4

src/Riok.Mapperly/SyntaxProvider.Roslyn4.0.cs

@@ -30,7 +30,7 @@ public static IncrementalValuesProvider<MapperDeclaration> GetMapperDeclarations
             .SyntaxProvider
             .CreateSyntaxProvider(
                 static (s, _) => s is CompilationUnitSyntax { AttributeLists.Count: > 0 },
-                static (ctx, ct) => GetMapperDefaultDeclarations(ctx, ct)
+                static (ctx, ct) => GetMapperDefaultDeclarations(ctx)
             )
             .Collect()
             .Select((x, _) => x.FirstOrDefault());
@@ -45,12 +45,9 @@ public static IncrementalValuesProvider<MapperDeclaration> GetMapperDeclarations
         return HasAttribute(symbol, MapperGenerator.MapperAttributeName) ? new MapperDeclaration(symbol, declaration) : null;
     }
 
-    private static IAssemblySymbol? GetMapperDefaultDeclarations(GeneratorSyntaxContext ctx, CancellationToken cancellationToken)
+    private static IAssemblySymbol? GetMapperDefaultDeclarations(GeneratorSyntaxContext ctx)
     {
-        var declaration = (CompilationUnitSyntax)ctx.Node;
-        if (ctx.SemanticModel.GetDeclaredSymbol(declaration, cancellationToken) is not IAssemblySymbol symbol)
-            return null;
-
+        var symbol = ctx.SemanticModel.Compilation.Assembly;
         return HasAttribute(symbol, MapperGenerator.MapperDefaultsAttributeName) ? symbol : null;
     }
 

test/Riok.Mapperly.IntegrationTests/EnumMapperTest.cs

@@ -0,0 +1,28 @@
+using System.Threading.Tasks;
+using Riok.Mapperly.IntegrationTests.Helpers;
+using Riok.Mapperly.IntegrationTests.Mapper;
+using VerifyXunit;
+using Xunit;
+
+namespace Riok.Mapperly.IntegrationTests
+{
+    [UsesVerify]
+    public class EnumMapperTest : BaseMapperTest
+    {
+        [Fact]
+        [VersionedSnapshot(Versions.NET7_0)]
+        public Task SnapshotGeneratedSource()
+        {
+            var path = GetGeneratedMapperFilePath(nameof(EnumMapper));
+            return Verifier.VerifyFile(path);
+        }
+
+        [Fact]
+        [VersionedSnapshot(Versions.NET7_0)]
+        public Task RunMappingShouldWork()
+        {
+            var enum2 = Enum1.Value1.Map();
+            return Verifier.Verify(enum2);
+        }
+    }
+}

test/Riok.Mapperly.IntegrationTests/Mapper/EnumMapper.cs

@@ -0,0 +1,24 @@
+using Riok.Mapperly.Abstractions;
+
+[assembly: MapperDefaults(EnumMappingStrategy = EnumMappingStrategy.ByName)]
+
+namespace Riok.Mapperly.IntegrationTests.Mapper
+{
+    [Mapper]
+    public static partial class EnumMapper
+    {
+        public static partial Enum2 Map(this Enum1 e);
+    }
+
+    public enum Enum1
+    {
+        Value1 = 4,
+        Value2 = 7,
+    }
+
+    public enum Enum2
+    {
+        Value1,
+        Value2,
+    }
+}

test/Riok.Mapperly.IntegrationTests/_snapshots/EnumMapperTest.RunMappingShouldWork_NET7_0.verified.txt

@@ -0,0 +1 @@
+Value1

test/Riok.Mapperly.IntegrationTests/_snapshots/EnumMapperTest.SnapshotGeneratedSource_NET7_0.verified.cs

@@ -0,0 +1,17 @@
+// <auto-generated />
+#nullable enable
+namespace Riok.Mapperly.IntegrationTests.Mapper
+{
+    public static partial class EnumMapper
+    {
+        public static partial global::Riok.Mapperly.IntegrationTests.Mapper.Enum2 Map(this global::Riok.Mapperly.IntegrationTests.Mapper.Enum1 e)
+        {
+            return e switch
+            {
+                global::Riok.Mapperly.IntegrationTests.Mapper.Enum1.Value1 => global::Riok.Mapperly.IntegrationTests.Mapper.Enum2.Value1,
+                global::Riok.Mapperly.IntegrationTests.Mapper.Enum1.Value2 => global::Riok.Mapperly.IntegrationTests.Mapper.Enum2.Value2,
+                _ => throw new System.ArgumentOutOfRangeException(nameof(e), e, "The value of enum Enum1 is not supported"),
+            };
+        }
+    }
+}