/
CompareSymbolsCorrectlyFix.cs
67 lines (58 loc) · 3.07 KB
/
CompareSymbolsCorrectlyFix.cs
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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System.Collections.Immutable;
using System.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Operations;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.Analyzers.MetaAnalyzers.Fixers
{
[ExportCodeFixProvider(LanguageNames.CSharp, LanguageNames.VisualBasic, Name = nameof(CompareSymbolsCorrectlyFix))]
[Shared]
public class CompareSymbolsCorrectlyFix : CodeFixProvider
{
public override ImmutableArray<string> FixableDiagnosticIds => ImmutableArray.Create(CompareSymbolsCorrectlyAnalyzer.Rule.Id);
public override FixAllProvider GetFixAllProvider()
=> WellKnownFixAllProviders.BatchFixer;
public override Task RegisterCodeFixesAsync(CodeFixContext context)
{
foreach (var diagnostic in context.Diagnostics)
{
context.RegisterCodeFix(
CodeAction.Create(
CodeAnalysisDiagnosticsResources.CompareSymbolsCorrectlyCodeFix,
cancellationToken => ConvertToEqualsAsync(context.Document, diagnostic.Location.SourceSpan, cancellationToken),
equivalenceKey: nameof(CompareSymbolsCorrectlyFix)),
diagnostic);
}
return Task.CompletedTask;
}
private async Task<Document> ConvertToEqualsAsync(Document document, TextSpan sourceSpan, CancellationToken cancellationToken)
{
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var expression = root.FindNode(sourceSpan, getInnermostNodeForTie: true);
if (!(semanticModel.GetOperation(expression, cancellationToken) is IBinaryOperation operation))
{
return document;
}
var editor = await DocumentEditor.CreateAsync(document, cancellationToken).ConfigureAwait(false);
var generator = editor.Generator;
var replacement = generator.InvocationExpression(
generator.MemberAccessExpression(
generator.TypeExpression(semanticModel.Compilation.GetSpecialType(SpecialType.System_Object)),
nameof(object.Equals)),
operation.LeftOperand.Syntax.WithoutLeadingTrivia(),
operation.RightOperand.Syntax.WithoutTrailingTrivia());
if (operation.OperatorKind == BinaryOperatorKind.NotEquals)
{
replacement = generator.LogicalNotExpression(replacement);
}
editor.ReplaceNode(expression, replacement.WithTriviaFrom(expression));
return editor.GetChangedDocument();
}
}
}