// 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.Linq;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.Shared.Extensions;
internal static class ITypeParameterSymbolExtensions
{
public static INamedTypeSymbol? GetNamedTypeSymbolConstraint(this ITypeParameterSymbol typeParameter)
=> typeParameter.ConstraintTypes.Select(GetNamedTypeSymbol).WhereNotNull().FirstOrDefault();
private static INamedTypeSymbol? GetNamedTypeSymbol(ITypeSymbol type)
{
return type is INamedTypeSymbol
? (INamedTypeSymbol)type
: type is ITypeParameterSymbol
? GetNamedTypeSymbolConstraint((ITypeParameterSymbol)type)
: null;
}
}
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