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// Copyright (c) 2010-2013 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 System.Collections.ObjectModel;
using System.Diagnostics;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
namespace ICSharpCode.NRefactory.CSharp.TypeSystem
{
/// <summary>
/// Type reference used within an attribute.
/// Looks up both 'withoutSuffix' and 'withSuffix' and returns the type that exists.
/// </summary>
[Serializable]
public sealed class AttributeTypeReference : ITypeReference, ISupportsInterning
{
readonly ITypeReference withoutSuffix, withSuffix;
public AttributeTypeReference(ITypeReference withoutSuffix, ITypeReference withSuffix)
{
if (withoutSuffix == null)
throw new ArgumentNullException("withoutSuffix");
if (withSuffix == null)
throw new ArgumentNullException("withSuffix");
this.withoutSuffix = withoutSuffix;
this.withSuffix = withSuffix;
}
public IType Resolve(ITypeResolveContext context)
{
IType t1 = withoutSuffix.Resolve(context);
IType t2 = withSuffix.Resolve(context);
return PreferAttributeTypeWithSuffix(t1, t2, context.Compilation) ? t2 : t1;
}
internal static bool PreferAttributeTypeWithSuffix(IType t1, IType t2, ICompilation compilation)
{
if (t2.Kind == TypeKind.Unknown) return false;
if (t1.Kind == TypeKind.Unknown) return true;
var attrTypeDef = compilation.FindType(KnownTypeCode.Attribute).GetDefinition();
if (attrTypeDef != null) {
bool t1IsAttribute = (t1.GetDefinition() != null && t1.GetDefinition().IsDerivedFrom(attrTypeDef));
bool t2IsAttribute = (t2.GetDefinition() != null && t2.GetDefinition().IsDerivedFrom(attrTypeDef));
if (t2IsAttribute && !t1IsAttribute)
return true;
// If both types exist and are attributes, C# considers that to be an ambiguity, but we are less strict.
}
return false;
}
public override string ToString()
{
return withoutSuffix.ToString() + "[Attribute]";
}
int ISupportsInterning.GetHashCodeForInterning()
{
unchecked {
return withoutSuffix.GetHashCode() + 715613 * withSuffix.GetHashCode();
}
}
bool ISupportsInterning.EqualsForInterning(ISupportsInterning other)
{
AttributeTypeReference atr = other as AttributeTypeReference;
return atr != null && this.withoutSuffix == atr.withoutSuffix && this.withSuffix == atr.withSuffix;
}
}
}
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