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Sergio0694Sergio0694
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Merge pull request #1140 from CommunityToolkit/dev/partial-props-support
Fix C# language version checks for `[ObservableProperty]`
2 parents 67889e8 + 27d43c1 commit 02891ce

14 files changed

Lines changed: 258 additions & 54 deletions

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‎dotnet.slnx‎

Lines changed: 3 additions & 3 deletions
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@@ -1,7 +1,4 @@
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<Solution>
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<Configurations>
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<Platform Name="Any CPU" />
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</Configurations>
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<Folder Name="/Solution Items/">
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<File Path=".editorconfig" />
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<File Path=".gitattributes" />
@@ -40,9 +37,11 @@
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<Project Path="tests/CommunityToolkit.Mvvm.Roslyn4001.UnitTests/CommunityToolkit.Mvvm.Roslyn4001.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.Roslyn4031.UnitTests/CommunityToolkit.Mvvm.Roslyn4031.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.Roslyn4120.UnitTests/CommunityToolkit.Mvvm.Roslyn4120.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.Roslyn5000.UnitTests/CommunityToolkit.Mvvm.Roslyn5000.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001.UnitTests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031.UnitTests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120.UnitTests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.UnitTests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.UnitTests.csproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.SourceGenerators.UnitTests/CommunityToolkit.Mvvm.SourceGenerators.UnitTests.shproj" />
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<Project Path="tests/CommunityToolkit.Mvvm.UnitTests/CommunityToolkit.Mvvm.UnitTests.shproj" />
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</Folder>
@@ -58,6 +57,7 @@
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<Project Path="src/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001.csproj" />
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<Project Path="src/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031.csproj" />
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<Project Path="src/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120/CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120.csproj" />
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<Project Path="src/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.csproj" />
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<Project Path="src/CommunityToolkit.Mvvm.SourceGenerators/CommunityToolkit.Mvvm.SourceGenerators.shproj" />
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<Project Path="src/CommunityToolkit.Mvvm/CommunityToolkit.Mvvm.csproj" />
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</Solution>

‎src/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.csproj‎

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@@ -0,0 +1,6 @@
1+
<Project Sdk="Microsoft.NET.Sdk">
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<Import Project="..\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.props" />
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<Import Project="..\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.projitems" Label="Shared" />
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</Project>

‎src/CommunityToolkit.Mvvm.SourceGenerators/CommunityToolkit.Mvvm.SourceGenerators.projitems‎

Lines changed: 1 addition & 1 deletion
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@@ -57,7 +57,7 @@
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\FieldWithOrphanedDependentObservablePropertyAttributesAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\FieldReferenceForObservablePropertyFieldAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\UnsupportedRoslynVersionForPartialPropertyAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\RequiresCSharpLanguageVersionPreviewAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\RequiresCSharpLanguageVersion14OrPreviewAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\InvalidPropertyLevelObservablePropertyAttributeAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\UseObservablePropertyOnPartialPropertyAnalyzer.cs" />
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<Compile Include="$(MSBuildThisFileDirectory)Diagnostics\Analyzers\UnsupportedCSharpLanguageVersionAnalyzer.cs" />

‎src/CommunityToolkit.Mvvm.SourceGenerators/CommunityToolkit.Mvvm.SourceGenerators.props‎

Lines changed: 2 additions & 1 deletion
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@@ -41,9 +41,10 @@
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<!-- Also define "ROSLYN_<MAJOR>_<MINOR>_OR_GREATER" build constants, so the generator code can multi-target whenever needed and add any required polyfills -->
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<DefineConstants Condition="$([MSBuild]::VersionGreaterThanOrEquals($(MvvmToolkitSourceGeneratorRoslynVersion), 4.3.1))">$(DefineConstants);ROSLYN_4_3_1_OR_GREATER</DefineConstants>
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<DefineConstants Condition="$([MSBuild]::VersionGreaterThanOrEquals($(MvvmToolkitSourceGeneratorRoslynVersion), 4.12.0))">$(DefineConstants);ROSLYN_4_12_0_OR_GREATER</DefineConstants>
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<DefineConstants Condition="$([MSBuild]::VersionGreaterThanOrEquals($(MvvmToolkitSourceGeneratorRoslynVersion), 5.0.0))">$(DefineConstants);ROSLYN_5_0_0_OR_GREATER</DefineConstants>
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<!-- Disable the removed rules analyzer for older Roslyn versions (as we might not support all diagnostics) -->
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<NoWarn Condition="$([MSBuild]::VersionLessThan($(MvvmToolkitSourceGeneratorRoslynVersion), 4.12.0))">$(NoWarn);RS2003</NoWarn>
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<NoWarn Condition="$([MSBuild]::VersionLessThan($(MvvmToolkitSourceGeneratorRoslynVersion), 5.0.0))">$(NoWarn);RS2003</NoWarn>
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</PropertyGroup>
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<ItemGroup>

‎src/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.Execute.cs‎

Lines changed: 11 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -80,11 +80,18 @@ public static bool IsCandidateValidForCompilation(MemberDeclarationSyntax node,
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return false;
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}
8282

83-
// If the target is a property, we only support using C# preview.
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// This is because the generator is relying on the 'field' keyword.
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if (node is PropertyDeclarationSyntax && !semanticModel.Compilation.IsLanguageVersionPreview())
86-
{
83+
// If the target is a property, we must either be using C# preview, or C# 14 or above. When we're using
84+
// an older version of Roslyn, we know properties will never be supported anyway, so we have nothing to
85+
// check. When we add Roslyn 18.0 support, we can also update this check to check for at least C# 14.
86+
if (node is PropertyDeclarationSyntax)
87+
{
88+
#if ROSLYN_5_0_0_OR_GREATER
89+
return semanticModel.Compilation.HasLanguageVersionAtLeastEqualTo(LanguageVersion.CSharp14);
90+
#elif ROSLYN_4_12_0_OR_GREATER
91+
return semanticModel.Compilation.IsLanguageVersionPreview();
92+
#else
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return false;
94+
#endif
8895
}
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// All other cases are supported, the syntax filter is already validating that

src/CommunityToolkit.Mvvm.SourceGenerators/Diagnostics/Analyzers/RequiresCSharpLanguageVersionPreviewAnalyzer.cs renamed to src/CommunityToolkit.Mvvm.SourceGenerators/Diagnostics/Analyzers/RequiresCSharpLanguageVersion14OrPreviewAnalyzer.cs

Lines changed: 9 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -15,13 +15,13 @@
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namespace CommunityToolkit.Mvvm.SourceGenerators;
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/// <summary>
18-
/// A diagnostic analyzer that generates errors when a property using <c>[ObservableProperty]</c> on a partial property is in a project with the C# language version not set to preview.
18+
/// A diagnostic analyzer that generates errors when a property using <c>[ObservableProperty]</c> on a partial property is in a project with the C# language version not set to 14.0 or 'preview'.
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/// </summary>
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[DiagnosticAnalyzer(LanguageNames.CSharp)]
21-
public sealed class RequiresCSharpLanguageVersionPreviewAnalyzer : DiagnosticAnalyzer
21+
public sealed class RequiresCSharpLanguageVersion14OrPreviewAnalyzer : DiagnosticAnalyzer
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{
2323
/// <inheritdoc/>
24-
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = [CSharpLanguageVersionIsNotPreviewForObservableProperty];
24+
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = [CSharpLanguageVersionIsNot14OrPreviewForObservableProperty];
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/// <inheritdoc/>
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public override void Initialize(AnalysisContext context)
@@ -31,8 +31,12 @@ public override void Initialize(AnalysisContext context)
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context.RegisterCompilationStartAction(static context =>
3333
{
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// If the language version is set to preview, we'll never emit diagnostics
34+
// If the language version is set to preview or if we are set to at least C# 14.0, we'll never emit diagnostics
35+
#if ROSLYN_5_0_0_OR_GREATER
36+
if (context.Compilation.HasLanguageVersionAtLeastEqualTo(LanguageVersion.CSharp14))
37+
#else
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if (context.Compilation.IsLanguageVersionPreview())
39+
#endif
3640
{
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return;
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}
@@ -69,7 +73,7 @@ public override void Initialize(AnalysisContext context)
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if (context.Symbol.TryGetAttributeWithType(observablePropertySymbol, out AttributeData? observablePropertyAttribute))
7074
{
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context.ReportDiagnostic(Diagnostic.Create(
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CSharpLanguageVersionIsNotPreviewForObservableProperty,
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CSharpLanguageVersionIsNot14OrPreviewForObservableProperty,
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observablePropertyAttribute.GetLocation(),
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context.Symbol));
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}

‎src/CommunityToolkit.Mvvm.SourceGenerators/Diagnostics/DiagnosticDescriptors.cs‎

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@@ -691,17 +691,17 @@ internal static class DiagnosticDescriptors
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/// <summary>
692692
/// Gets a <see cref="DiagnosticDescriptor"/> for the C# language version not being sufficient for <c>[ObservableProperty]</c> on partial properties.
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/// <para>
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/// Format: <c>"Using [ObservableProperty] on partial properties requires the C# language version to be set to 'preview', as support for the 'field' keyword is needed by the source generators to emit valid code (add <LangVersion>preview</LangVersion> to your .csproj/.props file)"</c>.
694+
/// Format: <c>"Using [ObservableProperty] on partial properties requires the C# language version to be set to at least 14.0 or 'preview', as support for the 'field' keyword is needed by the source generators to emit valid code (add <LangVersion>14.0</LangVersion> or <LangVersion>preview</LangVersion> to your .csproj/.props file)"</c>.
695695
/// </para>
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/// </summary>
697-
public static readonly DiagnosticDescriptor CSharpLanguageVersionIsNotPreviewForObservableProperty = new DiagnosticDescriptor(
697+
public static readonly DiagnosticDescriptor CSharpLanguageVersionIsNot14OrPreviewForObservableProperty = new DiagnosticDescriptor(
698698
id: "MVVMTK0041",
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title: "C# language version is not 'preview'",
700-
messageFormat: """Using [ObservableProperty] on partial properties requires the C# language version to be set to 'preview', as support for the 'field' keyword is needed by the source generators to emit valid code (add <LangVersion>preview</LangVersion> to your .csproj/.props file)""",
699+
title: "C# language version is not at least 14.0 or 'preview'",
700+
messageFormat: """Using [ObservableProperty] on partial properties requires the C# language version to be set to at least 14.0 or 'preview', as support for the 'field' keyword is needed by the source generators to emit valid code (add <LangVersion>14.0</LangVersion> or <LangVersion>preview</LangVersion> to your .csproj/.props file)""",
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category: typeof(ObservablePropertyGenerator).FullName,
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defaultSeverity: DiagnosticSeverity.Error,
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isEnabledByDefault: true,
704-
description: "The C# language version must be set to 'preview' when using [ObservableProperty] on partial properties for the source generators to emit valid code (the <LangVersion>preview</LangVersion> option must be set in the .csproj/.props file).",
704+
description: "The C# language version must be set to at least 14.0 or 'preview' when using [ObservableProperty] on partial properties for the source generators to emit valid code (the <LangVersion>14.0</LangVersion> or <LangVersion>preview</LangVersion> option must be set in the .csproj/.props file).",
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helpLinkUri: "https://aka.ms/mvvmtoolkit/errors/mvvmtk0041");
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/// <summary>

‎src/CommunityToolkit.Mvvm.SourceGenerators/Extensions/CompilationExtensions.cs‎

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Original file line numberDiff line numberDiff line change
@@ -27,6 +27,17 @@ public static bool HasLanguageVersionAtLeastEqualTo(this Compilation compilation
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return ((CSharpCompilation)compilation).LanguageVersion >= languageVersion;
2828
}
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30+
/// <summary>
31+
/// Checks whether a given compilation (assumed to be for C#) is using a language version greater than a specified one.
32+
/// </summary>
33+
/// <param name="compilation">The <see cref="Compilation"/> to consider for analysis.</param>
34+
/// <param name="languageVersion">The minimum language version to check.</param>
35+
/// <returns>Whether <paramref name="compilation"/> is using a language version greater than the specified one.</returns>
36+
public static bool HasLanguageVersionGreaterThan(this Compilation compilation, LanguageVersion languageVersion)
37+
{
38+
return ((CSharpCompilation)compilation).LanguageVersion > languageVersion;
39+
}
40+
3041
/// <summary>
3142
/// Checks whether a given compilation (assumed to be for C#) is using the preview language version.
3243
/// </summary>

‎src/CommunityToolkit.Mvvm.SourceGenerators/Extensions/DiagnosticsExtensions.cs‎

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@@ -12,7 +12,7 @@
1212
namespace CommunityToolkit.Mvvm.SourceGenerators.Extensions;
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1414
/// <summary>
15-
/// Extension methods for <see cref="GeneratorExecutionContext"/>, specifically for reporting diagnostics.
15+
/// Extension methods for working with diagnostics from incremental generator pipelines.
1616
/// </summary>
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internal static class DiagnosticsExtensions
1818
{

‎src/CommunityToolkit.Mvvm/CommunityToolkit.Mvvm.csproj‎

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@@ -69,6 +69,7 @@
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<ProjectReference Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001.csproj" ReferenceOutputAssembly="false" />
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<ProjectReference Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031.csproj" ReferenceOutputAssembly="false" />
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<ProjectReference Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120.csproj" ReferenceOutputAssembly="false" />
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<ProjectReference Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000\CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.csproj" ReferenceOutputAssembly="false" />
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<ProjectReference Include="..\CommunityToolkit.Mvvm.CodeFixers.Roslyn4001\CommunityToolkit.Mvvm.CodeFixers.Roslyn4001.csproj" ReferenceOutputAssembly="false" />
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<ProjectReference Include="..\CommunityToolkit.Mvvm.CodeFixers.Roslyn4120\CommunityToolkit.Mvvm.CodeFixers.Roslyn4120.csproj" ReferenceOutputAssembly="false" />
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</ItemGroup>
@@ -123,9 +124,11 @@
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<None Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4001\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.SourceGenerators.dll" PackagePath="analyzers\dotnet\roslyn4.0\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4031\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.SourceGenerators.dll" PackagePath="analyzers\dotnet\roslyn4.3\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.SourceGenerators.dll" PackagePath="analyzers\dotnet\roslyn4.12\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.SourceGenerators.Roslyn4120\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.SourceGenerators.dll" PackagePath="analyzers\dotnet\roslyn5.0\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.CodeFixers.Roslyn4001\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.CodeFixers.dll" PackagePath="analyzers\dotnet\roslyn4.0\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.CodeFixers.Roslyn4001\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.CodeFixers.dll" PackagePath="analyzers\dotnet\roslyn4.3\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.CodeFixers.Roslyn4120\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.CodeFixers.dll" PackagePath="analyzers\dotnet\roslyn4.12\cs" Pack="true" Visible="false" />
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<None Include="..\CommunityToolkit.Mvvm.CodeFixers.Roslyn4120\bin\$(Configuration)\netstandard2.0\CommunityToolkit.Mvvm.CodeFixers.dll" PackagePath="analyzers\dotnet\roslyn5.0\cs" Pack="true" Visible="false" />
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</ItemGroup>
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</Project>

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