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// 
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// 
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// 
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using ICSharpCode.Decompiler.TypeSystem;

namespace ICSharpCode.Decompiler.CSharp.Syntax
{
	/// <summary>
	/// [in|out] Name
	/// 
	/// Represents a type parameter.
	/// Note: mirroring the C# syntax, constraints are not part of the type parameter declaration, but belong
	/// to the parent type or method.
	/// </summary>
	public class TypeParameterDeclaration : AstNode
	{
		public static readonly Role<AttributeSection> AttributeRole = EntityDeclaration.AttributeRole;
		public static readonly TokenRole OutVarianceKeywordRole = new TokenRole("out");
		public static readonly TokenRole InVarianceKeywordRole = new TokenRole("in");

		public override NodeType NodeType {
			get { return NodeType.Unknown; }
		}

		public AstNodeCollection<AttributeSection> Attributes {
			get { return GetChildrenByRole(AttributeRole); }
		}

		VarianceModifier variance;

		public VarianceModifier Variance {
			get { return variance; }
			set { ThrowIfFrozen(); variance = value; }
		}

		public CSharpTokenNode VarianceToken {
			get {
				switch (Variance)
				{
					case VarianceModifier.Covariant:
						return GetChildByRole(OutVarianceKeywordRole);
					case VarianceModifier.Contravariant:
						return GetChildByRole(InVarianceKeywordRole);
					default:
						return CSharpTokenNode.Null;
				}
			}
		}

		public string Name {
			get {
				return GetChildByRole(Roles.Identifier).Name;
			}
			set {
				SetChildByRole(Roles.Identifier, Identifier.Create(value));
			}
		}

		public Identifier NameToken {
			get {
				return GetChildByRole(Roles.Identifier);
			}
			set {
				SetChildByRole(Roles.Identifier, value);
			}
		}

		public TypeParameterDeclaration()
		{
		}

		public TypeParameterDeclaration(string name)
		{
			Name = name;
		}

		public override void AcceptVisitor(IAstVisitor visitor)
		{
			visitor.VisitTypeParameterDeclaration(this);
		}

		public override T AcceptVisitor<T>(IAstVisitor<T> visitor)
		{
			return visitor.VisitTypeParameterDeclaration(this);
		}

		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitTypeParameterDeclaration(this, data);
		}

		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			TypeParameterDeclaration o = other as TypeParameterDeclaration;
			return o != null && this.Variance == o.Variance && MatchString(this.Name, o.Name) && this.Attributes.DoMatch(o.Attributes, match);
		}
	}
}
