Create & Test Namespace Emission (#914)

Author: HurricanKai

src/generators/Silk.NET.SilkTouch.Emitter/CSharpEmitter.cs

@@ -176,6 +176,27 @@ protected override FieldSymbol VisitField(FieldSymbol fieldSymbol)
             return fieldSymbol;
         }
 
+        protected override NamespaceSymbol VisitNamespace(NamespaceSymbol namespaceSymbol)
+        {
+            AssertClearState();
+
+            VisitIdentifier(namespaceSymbol.Identifier);
+            if (_syntax is not IdentifierNameSyntax namespaceIdentifierSyntax)
+                throw new InvalidOperationException("Namespace Identifier was not visited correctly");
+            ClearState();
+            
+            // TODO visit members
+
+            _syntax = NamespaceDeclaration
+                (
+                    List<AttributeListSyntax>(), TokenList(), namespaceIdentifierSyntax.WithTrailingTrivia(LineFeed),
+                    List<ExternAliasDirectiveSyntax>(), List<UsingDirectiveSyntax>(), List<MemberDeclarationSyntax>()
+                )
+                .WithNamespaceKeyword(Token(SyntaxTriviaList.Empty, SyntaxKind.NamespaceKeyword, TriviaList(Space)))
+                .WithOpenBraceToken(Token(SyntaxTriviaList.Empty, SyntaxKind.OpenBraceToken, TriviaList(LineFeed)));
+            return namespaceSymbol;
+        }
+
         protected override IdentifierSymbol VisitIdentifier(IdentifierSymbol identifierSymbol)
         {
             AssertClearState();

tests/Silk.NET.SilkTouch.Emitter.Tests/EmitterNamespaceTests.cs

@@ -0,0 +1,35 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Silk.NET.SilkTouch.Symbols;
+using Xunit;
+
+namespace Silk.NET.SilkTouch.Emitter.Tests;
+
+public class EmitterNamespaceTests : EmitterTest
+{
+    [Fact]
+    public void NamespaceIntegration()
+    {
+        var syntax = Transform(new NamespaceSymbol(new IdentifierSymbol("Test"), ImmutableArray<TypeSymbol>.Empty));
+
+        var result = syntax.ToFullString();
+        Assert.Equal("namespace Test\n{\n}", result);
+    }
+
+    [Fact]
+    public void NamespaceHasCorrectIdentifier()
+    {
+        var syntax = Transform
+                (new NamespaceSymbol(new IdentifierSymbol("Test"), ImmutableArray<TypeSymbol>.Empty)) as
+            NamespaceDeclarationSyntax;
+
+        Assert.NotNull(syntax);
+
+        Assert.Equal("Test", Assert.IsType<IdentifierNameSyntax>(syntax!.Name).Identifier.Text);
+    }
+}