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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.Linq;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
using ICSharpCode.NRefactory.Utils;
namespace ICSharpCode.NRefactory.CSharp.TypeSystem
{
[Serializable]
public sealed class MethodTypeParameterWithInheritedConstraints : DefaultUnresolvedTypeParameter
{
public MethodTypeParameterWithInheritedConstraints(int index, string name)
: base(SymbolKind.Method, index, name)
{
}
static ITypeParameter ResolveBaseTypeParameter(IMethod parentMethod, int index)
{
IMethod baseMethod = null;
if (parentMethod.IsOverride) {
foreach (IMethod m in InheritanceHelper.GetBaseMembers(parentMethod, false).OfType<IMethod>()) {
if (!m.IsOverride) {
baseMethod = m;
break;
}
}
} else if (parentMethod.IsExplicitInterfaceImplementation && parentMethod.ImplementedInterfaceMembers.Count == 1) {
baseMethod = parentMethod.ImplementedInterfaceMembers[0] as IMethod;
}
if (baseMethod != null && index < baseMethod.TypeParameters.Count)
return baseMethod.TypeParameters[index];
else
return null;
}
public override ITypeParameter CreateResolvedTypeParameter(ITypeResolveContext context)
{
if (context.CurrentMember is IMethod) {
return new ResolvedMethodTypeParameterWithInheritedConstraints(this, context);
} else {
return base.CreateResolvedTypeParameter(context);
}
}
sealed class ResolvedMethodTypeParameterWithInheritedConstraints : AbstractTypeParameter
{
volatile ITypeParameter baseTypeParameter;
public ResolvedMethodTypeParameterWithInheritedConstraints(MethodTypeParameterWithInheritedConstraints unresolved, ITypeResolveContext context)
: base(context.CurrentMember, unresolved.Index, unresolved.Name, unresolved.Variance,
unresolved.Attributes.CreateResolvedAttributes(context), unresolved.Region)
{
}
ITypeParameter GetBaseTypeParameter()
{
ITypeParameter baseTP = this.baseTypeParameter;
if (baseTP == null) {
// ResolveBaseTypeParameter() is idempotent, so this is thread-safe.
this.baseTypeParameter = baseTP = ResolveBaseTypeParameter((IMethod)this.Owner, this.Index);
}
return baseTP;
}
public override bool HasValueTypeConstraint {
get {
ITypeParameter baseTP = GetBaseTypeParameter();
return baseTP != null ? baseTP.HasValueTypeConstraint : false;
}
}
public override bool HasReferenceTypeConstraint {
get {
ITypeParameter baseTP = GetBaseTypeParameter();
return baseTP != null ? baseTP.HasReferenceTypeConstraint : false;
}
}
public override bool HasDefaultConstructorConstraint {
get {
ITypeParameter baseTP = GetBaseTypeParameter();
return baseTP != null ? baseTP.HasDefaultConstructorConstraint : false;
}
}
public override IEnumerable<IType> DirectBaseTypes {
get {
ITypeParameter baseTP = GetBaseTypeParameter();
if (baseTP != null) {
// Substitute occurrences of the base method's type parameters in the constraints
// with the type parameters from the
IMethod owner = (IMethod)this.Owner;
var substitution = new TypeParameterSubstitution(null, new ProjectedList<ITypeParameter, IType>(owner.TypeParameters, t => t));
return baseTP.DirectBaseTypes.Select(t => t.AcceptVisitor(substitution));
} else {
return EmptyList<IType>.Instance;
}
}
}
}
}
}
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