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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;
using System.Composition;
using System.Threading;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.UseCoalesceExpression;
namespace Microsoft.CodeAnalysis.CSharp.UseCoalesceExpression;
[ExtensionOrder(Before = PredefinedCodeFixProviderNames.AddBraces)]
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseCoalesceExpressionForIfNullStatementCheck), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class CSharpUseCoalesceExpressionForIfNullStatementCheckCodeFixProvider()
: AbstractUseCoalesceExpressionForIfNullStatementCheckCodeFixProvider
{
protected override ITypeSymbol? TryGetExplicitCast(
SemanticModel semanticModel, SyntaxNode expressionToCoalesce,
SyntaxNode leftAssignmentPart, SyntaxNode rightAssignmentPart,
CancellationToken cancellationToken)
{
var leftPartTypeSymbol = semanticModel.GetTypeInfo(expressionToCoalesce, cancellationToken).Type;
var rightPartTypeSymbol = semanticModel.GetTypeInfo(rightAssignmentPart, cancellationToken).Type;
var finalDestinationTypeSymbol = semanticModel.GetTypeInfo(leftAssignmentPart, cancellationToken).Type;
if (leftPartTypeSymbol == null || rightPartTypeSymbol == null || finalDestinationTypeSymbol == null)
return null;
if (leftPartTypeSymbol.Equals(rightPartTypeSymbol))
return null;
if (semanticModel.Compilation.HasImplicitConversion(leftPartTypeSymbol, rightPartTypeSymbol) ||
semanticModel.Compilation.HasImplicitConversion(rightPartTypeSymbol, leftPartTypeSymbol))
{
return null;
}
return finalDestinationTypeSymbol;
}
}
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