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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.
#nullable enable
#pragma warning disable RS1024 // Use 'SymbolEqualityComparer' when comparing symbols (https://github.com/dotnet/roslyn/issues/78583)
#nullable disable
using System;
using System.Linq;
namespace Microsoft.CodeAnalysis.Shared.Extensions;
internal static partial class ITypeSymbolExtensions
{
private sealed class UnnamedErrorTypeRemover(Compilation compilation) : SymbolVisitor<ITypeSymbol>
{
public override ITypeSymbol DefaultVisit(ISymbol node)
=> throw new NotImplementedException();
public override ITypeSymbol VisitDynamicType(IDynamicTypeSymbol symbol)
=> symbol;
public override ITypeSymbol VisitArrayType(IArrayTypeSymbol symbol)
{
var elementType = symbol.ElementType.Accept(this);
if (elementType != null && elementType.Equals(symbol.ElementType))
{
return symbol;
}
return compilation.CreateArrayTypeSymbol(elementType, symbol.Rank);
}
public override ITypeSymbol VisitFunctionPointerType(IFunctionPointerTypeSymbol symbol)
{
// TODO(https://github.com/dotnet/roslyn/issues/43890): implement this
return symbol;
}
public override ITypeSymbol VisitNamedType(INamedTypeSymbol symbol)
{
if (symbol.IsErrorType() && symbol.Name == string.Empty)
{
return compilation.ObjectType;
}
var arguments = symbol.TypeArguments.Select(t => t.Accept(this)).ToArray();
if (arguments.SequenceEqual(symbol.TypeArguments))
{
return symbol;
}
return symbol.ConstructedFrom.Construct([.. arguments]);
}
public override ITypeSymbol VisitPointerType(IPointerTypeSymbol symbol)
{
var elementType = symbol.PointedAtType.Accept(this);
if (elementType != null && elementType.Equals(symbol.PointedAtType))
{
return symbol;
}
return compilation.CreatePointerTypeSymbol(elementType);
}
public override ITypeSymbol VisitTypeParameter(ITypeParameterSymbol symbol)
=> symbol;
}
}
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