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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.
using System.Collections.Immutable;
using System.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace Microsoft.AspNetCore.Analyzers.RouteHandlers.Fixers;
[ExportCodeFixProvider(LanguageNames.CSharp), Shared]
public class DetectMismatchedParameterOptionalityFixer : CodeFixProvider
{
public override ImmutableArray<string> FixableDiagnosticIds { get; } = ImmutableArray.Create(DiagnosticDescriptors.DetectMismatchedParameterOptionality.Id);
public sealed override FixAllProvider GetFixAllProvider() => WellKnownFixAllProviders.BatchFixer;
public sealed override Task RegisterCodeFixesAsync(CodeFixContext context)
{
foreach (var diagnostic in context.Diagnostics)
{
context.RegisterCodeFix(
CodeAction.Create("Fix mismatched route parameter and argument optionality",
cancellationToken => FixMismatchedParameterOptionalityAsync(diagnostic, context.Document, cancellationToken),
equivalenceKey: DiagnosticDescriptors.DetectMismatchedParameterOptionality.Id),
diagnostic);
}
return Task.CompletedTask;
}
private static async Task<Document> FixMismatchedParameterOptionalityAsync(Diagnostic diagnostic, Document document, CancellationToken cancellationToken)
{
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
if (root is null)
{
return document;
}
var param = root.FindNode(diagnostic.Location.SourceSpan);
if (param is ParameterSyntax { Type: { } parameterType } parameterSyntax)
{
var newParam = parameterSyntax.WithType(SyntaxFactory.NullableType(parameterType));
return document.WithSyntaxRoot(root.ReplaceNode(parameterSyntax, newParam));
}
return document;
}
}
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