// 
// UnaryOperatorExpression.cs
//  
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2009 Novell, Inc (http://www.novell.com)
// 
// 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;

namespace ICSharpCode.NRefactory.CSharp
{
	/// <summary>
	/// Operator Expression
	/// </summary>
	public class UnaryOperatorExpression : Expression
	{
		public readonly static Role<CSharpTokenNode> OperatorRole = BinaryOperatorExpression.OperatorRole;
		
		public UnaryOperatorExpression()
		{
		}
		
		public UnaryOperatorExpression(UnaryOperatorType op, Expression expression)
		{
			this.Operator = op;
			this.Expression = expression;
		}
		
		public UnaryOperatorType Operator {
			get;
			set;
		}
		
		public CSharpTokenNode OperatorToken {
			get { return GetChildByRole (OperatorRole); }
		}
		
		public Expression Expression {
			get { return GetChildByRole (Roles.Expression); }
			set { SetChildByRole (Roles.Expression, value); }
		}
		
		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitUnaryOperatorExpression (this, data);
		}
		
		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			UnaryOperatorExpression o = other as UnaryOperatorExpression;
			return o != null && this.Operator == o.Operator && this.Expression.DoMatch(o.Expression, match);
		}
		
		public static string GetOperatorSymbol(UnaryOperatorType op)
		{
			switch (op) {
				case UnaryOperatorType.Not:
					return "!";
				case UnaryOperatorType.BitNot:
					return "~";
				case UnaryOperatorType.Minus:
					return "-";
				case UnaryOperatorType.Plus:
					return "+";
				case UnaryOperatorType.Increment:
				case UnaryOperatorType.PostIncrement:
					return "++";
				case UnaryOperatorType.PostDecrement:
				case UnaryOperatorType.Decrement:
					return "--";
				case UnaryOperatorType.Dereference:
					return "*";
				case UnaryOperatorType.AddressOf:
					return "&";
				default:
					throw new NotSupportedException("Invalid value for UnaryOperatorType");
			}
		}
	}
	
	public enum UnaryOperatorType
	{
		/// <summary>Logical not (!a)</summary>
		Not,
		/// <summary>Bitwise not (~a)</summary>
		BitNot,
		/// <summary>Unary minus (-a)</summary>
		Minus,
		/// <summary>Unary plus (+a)</summary>
		Plus,
		/// <summary>Pre increment (++a)</summary>
		Increment,
		/// <summary>Pre decrement (--a)</summary>
		Decrement,
		/// <summary>Post increment (a++)</summary>
		PostIncrement,
		/// <summary>Post decrement (a--)</summary>
		PostDecrement,
		/// <summary>Dereferencing (*a)</summary>
		Dereference,
		/// <summary>Get address (&a)</summary>
		AddressOf
	}
	
}