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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 disable
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp
{
/// <summary>
/// A binder that places method type parameters in scope.
/// </summary>
internal sealed class WithMethodTypeParametersBinder : WithTypeParametersBinder
{
private readonly MethodSymbol _methodSymbol;
private MultiDictionary<string, TypeParameterSymbol> _lazyTypeParameterMap;
internal WithMethodTypeParametersBinder(MethodSymbol methodSymbol, Binder next)
: base(next)
{
_methodSymbol = methodSymbol;
}
protected override bool InExecutableBinder => false;
internal override Symbol ContainingMemberOrLambda
{
get
{
return _methodSymbol;
}
}
protected override MultiDictionary<string, TypeParameterSymbol> TypeParameterMap
{
get
{
if (_lazyTypeParameterMap == null)
{
var result = new MultiDictionary<string, TypeParameterSymbol>();
foreach (var typeParameter in _methodSymbol.TypeParameters)
{
result.Add(typeParameter.Name, typeParameter);
}
Interlocked.CompareExchange(ref _lazyTypeParameterMap, result, null);
}
return _lazyTypeParameterMap;
}
}
protected override LookupOptions LookupMask
{
get
{
return LookupOptions.NamespaceAliasesOnly | LookupOptions.MustNotBeMethodTypeParameter;
}
}
internal override void AddLookupSymbolsInfoInSingleBinder(LookupSymbolsInfo result, LookupOptions options, Binder originalBinder)
{
if (CanConsiderTypeParameters(options))
{
foreach (var parameter in _methodSymbol.TypeParameters)
{
if (originalBinder.CanAddLookupSymbolInfo(parameter, options, result, null))
{
result.AddSymbol(parameter, parameter.Name, 0);
}
}
}
}
}
}
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