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// 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 more information.
using System.Collections.Immutable;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.CodeFixes.UseExpressionBodyForLambda;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.CSharp.UseExpressionBodyForLambda;
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseExpressionBodyForLambda), Shared]
[method: ImportingConstructor]
[method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
internal sealed class UseExpressionBodyForLambdaCodeFixProvider() : SyntaxEditorBasedCodeFixProvider
{
public override ImmutableArray<string> FixableDiagnosticIds { get; } = [IDEDiagnosticIds.UseExpressionBodyForLambdaExpressionsDiagnosticId];
public override Task RegisterCodeFixesAsync(CodeFixContext context)
{
var document = context.Document;
var diagnostic = context.Diagnostics[0];
var title = diagnostic.GetMessage();
var codeAction = CodeAction.Create(
title,
c => FixWithSyntaxEditorAsync(document, diagnostic, c),
title);
context.RegisterCodeFix(codeAction, context.Diagnostics);
return Task.CompletedTask;
}
protected override Task FixAllAsync(Document document, ImmutableArray<Diagnostic> diagnostics, SyntaxEditor editor, CancellationToken cancellationToken)
=> FixAllImplAsync(document, diagnostics, editor, cancellationToken);
private static async Task FixAllImplAsync(Document document, ImmutableArray<Diagnostic> diagnostics, SyntaxEditor editor, CancellationToken cancellationToken)
{
var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
foreach (var diagnostic in diagnostics)
{
cancellationToken.ThrowIfCancellationRequested();
AddEdits(editor, semanticModel, diagnostic, cancellationToken);
}
}
private static Task<Document> FixWithSyntaxEditorAsync(Document document, Diagnostic diagnostic, CancellationToken cancellationToken)
=> FixAllWithEditorAsync(
document, editor => FixAllImplAsync(document, [diagnostic], editor, cancellationToken), cancellationToken);
private static void AddEdits(
SyntaxEditor editor, SemanticModel semanticModel,
Diagnostic diagnostic, CancellationToken cancellationToken)
{
var declarationLocation = diagnostic.AdditionalLocations[0];
var originalDeclaration = (LambdaExpressionSyntax)declarationLocation.FindNode(getInnermostNodeForTie: true, cancellationToken);
editor.ReplaceNode(
originalDeclaration,
(current, _) => UseExpressionBodyForLambdaCodeActionHelpers.Update(semanticModel, originalDeclaration, (LambdaExpressionSyntax)current, cancellationToken));
}
}
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