Fix For AoT build (#20)

Remove Attributes and Generate them instead, resulting in no reference to ReactiveUI.SourceGenerators being required in end App.

Author: ChrisPulman

src/ReactiveUI.SourceGenerators.Execute.Maui/ReactiveUI.SourceGenerators.Execute.Maui.csproj

@@ -24,7 +24,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-	  <ProjectReference Include="..\ReactiveUI.SourceGenerators\ReactiveUI.SourceGenerators.csproj" OutputItemType="Analyzer" />
+	  <ProjectReference Include="..\ReactiveUI.SourceGenerators\ReactiveUI.SourceGenerators.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
 	</ItemGroup>
 
 </Project>

src/ReactiveUI.SourceGenerators.Execute/ReactiveUI.SourceGenerators.Execute.csproj

@@ -13,7 +13,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\ReactiveUI.SourceGenerators\ReactiveUI.SourceGenerators.csproj" OutputItemType="Analyzer" />
+    <ProjectReference Include="..\ReactiveUI.SourceGenerators\ReactiveUI.SourceGenerators.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
   </ItemGroup>
 
   <ItemGroup>

src/ReactiveUI.SourceGenerators/Attributes/IViewForAttribute.cs

@@ -0,0 +1,142 @@
+// Copyright (c) 2024 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+namespace ReactiveUI.SourceGenerators.Helpers;
+
+internal static class AttributeDefinitions
+{
+    public const string ReactiveObjectAttribute = """
+// Copyright (c) 2024 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+
+// <auto-generated/>
+#pragma warning disable
+#nullable enable
+namespace ReactiveUI.SourceGenerators;
+
+/// <summary>
+/// ReactiveObjectAttribute.
+/// </summary>
+/// <seealso cref="System.Attribute" />
+[global::System.CodeDom.Compiler.GeneratedCode("ReactiveUI.SourceGenerators.IViewForGenerator", "1.1.0.0")]
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+public sealed class ReactiveObjectAttribute : Attribute;
+#nullable restore
+#pragma warning restore
+""";
+
+    public const string ReactiveCommandAttribute = """
+// Copyright (c) 2024 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+
+// <auto-generated/>
+#pragma warning disable
+#nullable enable
+namespace ReactiveUI.SourceGenerators;
+
+/// <summary>
+/// ReativeCommandAttribute.
+/// </summary>
+/// <seealso cref="Attribute" />
+[global::System.CodeDom.Compiler.GeneratedCode("ReactiveUI.SourceGenerators.IViewForGenerator", "1.1.0.0")]
+[AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
+public sealed class ReactiveCommandAttribute : Attribute
+{
+    /// <summary>
+    /// Gets the can execute method or property.
+    /// </summary>
+    /// <value>
+    /// The name of the CanExecute Observable of bool.
+    /// </value>
+    public string? CanExecute { get; init; }
+}
+#nullable restore
+#pragma warning restore
+""";
+
+    public const string ReactiveAttribute = """
+// Copyright (c) 2024 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+
+// <auto-generated/>
+#pragma warning disable
+#nullable enable
+namespace ReactiveUI.SourceGenerators;
+
+/// <summary>
+/// ReactiveAttribute.
+/// </summary>
+/// <seealso cref="Attribute" />
+[global::System.CodeDom.Compiler.GeneratedCode("ReactiveUI.SourceGenerators.IViewForGenerator", "1.1.0.0")]
+[AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
+public sealed class ReactiveAttribute : Attribute;
+#nullable restore
+#pragma warning restore
+""";
+
+    public const string ObservableAsPropertyAttribute = """
+// Copyright (c) 2024 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+
+// <auto-generated/>
+#pragma warning disable
+#nullable enable
+namespace ReactiveUI.SourceGenerators;
+
+/// <summary>
+/// ReactivePropertyAttribute.
+/// </summary>
+/// <seealso cref="Attribute" />
+[global::System.CodeDom.Compiler.GeneratedCode("ReactiveUI.SourceGenerators.IViewForGenerator", "1.1.0.0")]
+[AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
+public sealed class ObservableAsPropertyAttribute : Attribute;
+#nullable restore
+#pragma warning restore
+""";
+
+    public const string IViewForAttribute = """
+// Copyright (c) 2024 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+
+// <auto-generated/>
+#pragma warning disable
+#nullable enable
+namespace ReactiveUI.SourceGenerators;
+
+/// <summary>
+/// ReactiveObjectAttribute.
+/// </summary>
+/// <seealso cref="System.Attribute" />
+/// <remarks>
+/// Initializes a new instance of the <see cref="IViewForAttribute"/> class.
+/// </remarks>
+/// <param name="viewModelType">Type of the view model.</param>
+[global::System.CodeDom.Compiler.GeneratedCode("ReactiveUI.SourceGenerators.IViewForGenerator", "1.1.0.0")]
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+public sealed class IViewForAttribute(string? viewModelType) : Attribute;
+#nullable restore
+#pragma warning restore
+""";
+}

src/ReactiveUI.SourceGenerators/Attributes/ObservableAsPropertyAttribute.cs

@@ -7,10 +7,12 @@
 using System.Collections.Immutable;
 using System.IO;
 using System.Linq;
+using System.Text;
 using System.Threading;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Text;
 using ReactiveUI.SourceGenerators.Extensions;
 using ReactiveUI.SourceGenerators.Helpers;
 using ReactiveUI.SourceGenerators.Input.Models;
@@ -31,7 +33,10 @@ public sealed partial class IViewForGenerator : IIncrementalGenerator
     /// <inheritdoc/>
     public void Initialize(IncrementalGeneratorInitializationContext context)
     {
-        // Gather info for all annotated command methods (starting from method declarations with at least one attribute)
+        context.RegisterPostInitializationOutput(ctx =>
+            ctx.AddSource($"{IViewForAttribute}.g.cs", SourceText.From(AttributeDefinitions.IViewForAttribute, Encoding.UTF8)));
+
+        // Gather info for all annotated IViewFor Classes
         IncrementalValuesProvider<(HierarchyInfo Hierarchy, Result<IViewForInfo> Info)> iViewForInfoWithErrors =
             context.SyntaxProvider
             .ForAttributeWithMetadataName(

src/ReactiveUI.SourceGenerators/Attributes/ReactiveAttribute.cs

@@ -5,9 +5,12 @@
 
 using System.Collections.Immutable;
 using System.Linq;
+using System.Text;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Text;
 using ReactiveUI.SourceGenerators.Extensions;
+using ReactiveUI.SourceGenerators.Helpers;
 using ReactiveUI.SourceGenerators.Models;
 
 namespace ReactiveUI.SourceGenerators;
@@ -18,14 +21,19 @@ namespace ReactiveUI.SourceGenerators;
 [Generator(LanguageNames.CSharp)]
 public sealed partial class ObservableAsPropertyGenerator : IIncrementalGenerator
 {
+    private const string ObservableAsPropertyAttribute = "ReactiveUI.SourceGenerators.ObservableAsPropertyAttribute";
+
     /// <inheritdoc/>
     public void Initialize(IncrementalGeneratorInitializationContext context)
     {
+        context.RegisterPostInitializationOutput(ctx =>
+            ctx.AddSource($"{ObservableAsPropertyAttribute}.g.cs", SourceText.From(AttributeDefinitions.ObservableAsPropertyAttribute, Encoding.UTF8)));
+
         // Gather info for all annotated command methods (starting from method declarations with at least one attribute)
         IncrementalValuesProvider<(HierarchyInfo Hierarchy, Result<PropertyInfo> Info)> propertyInfoWithErrors =
             context.SyntaxProvider
             .ForAttributeWithMetadataName(
-                "ReactiveUI.SourceGenerators.ObservableAsPropertyAttribute",
+                ObservableAsPropertyAttribute,
                 static (node, _) => node is VariableDeclaratorSyntax { Parent: VariableDeclarationSyntax { Parent: FieldDeclarationSyntax { Parent: ClassDeclarationSyntax or RecordDeclarationSyntax, AttributeLists.Count: > 0 } } },
                 static (context, token) =>
                 {