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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
namespace ICSharpCode.NRefactory.TypeSystem
{
/// <summary>
/// Contains static implementations of special types.
/// </summary>
[Serializable]
public sealed class SpecialType : AbstractType, ITypeReference
{
/// <summary>
/// Gets the type representing resolve errors.
/// </summary>
public readonly static SpecialType UnknownType = new SpecialType(TypeKind.Unknown, "?", isReferenceType: null);
/// <summary>
/// The null type is used as type of the null literal. It is a reference type without any members; and it is a subtype of all reference types.
/// </summary>
public readonly static SpecialType NullType = new SpecialType(TypeKind.Null, "null", isReferenceType: true);
/// <summary>
/// Type representing the C# 'dynamic' type.
/// </summary>
public readonly static SpecialType Dynamic = new SpecialType(TypeKind.Dynamic, "dynamic", isReferenceType: true);
/// <summary>
/// A type used for unbound type arguments in partially parameterized types.
/// </summary>
/// <see cref="IType.GetNestedTypes(Predicate{ITypeDefinition}, GetMemberOptions)"/>
public readonly static SpecialType UnboundTypeArgument = new SpecialType(TypeKind.UnboundTypeArgument, "", isReferenceType: null);
readonly TypeKind kind;
readonly string name;
readonly bool? isReferenceType;
private SpecialType(TypeKind kind, string name, bool? isReferenceType)
{
this.kind = kind;
this.name = name;
this.isReferenceType = isReferenceType;
}
public override ITypeReference ToTypeReference()
{
return this;
}
public override string Name {
get { return name; }
}
public override TypeKind Kind {
get { return kind; }
}
public override bool? IsReferenceType {
get { return isReferenceType; }
}
IType ITypeReference.Resolve(ITypeResolveContext context)
{
if (context == null)
throw new ArgumentNullException("context");
return this;
}
#pragma warning disable 809
[Obsolete("Please compare special types using the kind property instead.")]
public override bool Equals(IType other)
{
// We consider a special types equal when they have equal types.
// However, an unknown type with additional information is not considered to be equal to the SpecialType with TypeKind.Unknown.
return other is SpecialType && other.Kind == kind;
}
public override int GetHashCode()
{
return 81625621 ^ (int)kind;
}
}
}
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