Fixed source-generated class names

src/HotChocolate/Core/src/Types.Analyzers/Generators/DataLoaderModuleGenerator.cs

@@ -81,7 +81,7 @@ public void Generate(
         {
             if (syntaxInfo is DataLoaderModuleInfo module)
             {
-                return module;
+                return new DataLoaderModuleInfo(GeneratorUtils.SanitizeIdentifier(module.ModuleName));
             }
         }
 

src/HotChocolate/Core/src/Types.Analyzers/Helpers/GeneratorUtils.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.Text.RegularExpressions;
 using HotChocolate.Types.Analyzers.Models;
 using Microsoft.CodeAnalysis;
 
@@ -16,7 +17,7 @@ public static ModuleInfo GetModuleInfo(
             if (syntaxInfo is ModuleInfo module)
             {
                 defaultModule = false;
-                return module;
+                return new ModuleInfo(SanitizeIdentifier(module.ModuleName), module.Options);
             }
         }
 
@@ -61,7 +62,7 @@ public static DataLoaderDefaultsInfo GetDataLoaderDefaults(
     public static string CreateModuleName(string? assemblyName)
         => assemblyName is null
             ? "AssemblyTypes"
-            : assemblyName.Split('.').Last() + "Types";
+            : SanitizeIdentifier(assemblyName.Split('.').Last()) + "Types";
 
     public static string ConvertDefaultValueToString(object? defaultValue, ITypeSymbol type)
     {
@@ -104,4 +105,18 @@ public static string ConvertDefaultValueToString(object? defaultValue, ITypeSymb
 
         return defaultValue.ToString();
     }
+
+    public static string SanitizeIdentifier(string input)
+    {
+        Regex invalidCharsRegex = new("[^a-zA-Z0-9]", RegexOptions.Compiled);
+
+        var sanitized = invalidCharsRegex.Replace(input, "_");
+
+        if (!char.IsLetter(sanitized[0]))
+        {
+            sanitized = "_" + sanitized.Substring(1);
+        }
+
+        return sanitized;
+    }
 }

src/HotChocolate/Core/test/Types.Analyzers.Tests/TestHelper.cs

@@ -22,7 +22,7 @@ public static Snapshot GetGeneratedSourceSnapshot([StringSyntax("csharp")] strin
         return GetGeneratedSourceSnapshot([sourceText]);
     }
 
-    public static Snapshot GetGeneratedSourceSnapshot(string[] sourceTexts)
+    public static Snapshot GetGeneratedSourceSnapshot(string[] sourceTexts, string? assemblyName = "Tests")
     {
         IEnumerable<PortableExecutableReference> references =
         [
@@ -47,7 +47,7 @@ public static Snapshot GetGeneratedSourceSnapshot(string[] sourceTexts)
 
         // Create a Roslyn compilation for the syntax tree.
         var compilation = CSharpCompilation.Create(
-            assemblyName: "Tests",
+            assemblyName: assemblyName,
             syntaxTrees: sourceTexts.Select(s => CSharpSyntaxTree.ParseText(s)),
             references);
 

src/HotChocolate/Core/test/Types.Analyzers.Tests/TypeModuleSyntaxGeneratorTests.cs

@@ -157,4 +157,20 @@ public static async Task<IReadOnlyDictionary<int, object>> GetObjectByIdAAsync(
             """
         ]).MatchMarkdownAsync();
     }
+
+    [Fact]
+    public async Task GenerateSource_With_Problematic_Assembly_Name_MatchesSnapshot()
+    {
+        await TestHelper.GetGeneratedSourceSnapshot(
+        [
+            """
+            using HotChocolate.Types;
+
+            namespace TestNamespace;
+
+            internal class ATestBType: ObjectType<ATestB>;
+            internal record ATestB(int Id);
+            """
+        ], assemblyName:"Custom-Module").MatchMarkdownAsync();
+    }
 }

src/HotChocolate/Core/test/Types.Analyzers.Tests/__snapshots__/TypeModuleSyntaxGeneratorTests.GenerateSource_With_Problematic_Assembly_Name_MatchesSnapshot.md

@@ -0,0 +1,27 @@
+# GenerateSource_With_Problematic_Assembly_Name_MatchesSnapshot
+
+```csharp
+// <auto-generated/>
+
+#nullable enable
+#pragma warning disable
+
+using System;
+using System.Runtime.CompilerServices;
+using HotChocolate;
+using HotChocolate.Types;
+using HotChocolate.Execution.Configuration;
+
+namespace Microsoft.Extensions.DependencyInjection
+{
+    public static partial class Custom_ModuleTypesRequestExecutorBuilderExtensions
+    {
+        public static IRequestExecutorBuilder AddCustom_ModuleTypes(this IRequestExecutorBuilder builder)
+        {
+            builder.AddType<global::TestNamespace.ATestBType>();
+            return builder;
+        }
+    }
+}
+
+```