// 
// ParenthesizedExpression.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.

namespace ICSharpCode.NRefactory.CSharp
{
	/// <summary>
	/// ( Expression )
	/// </summary>
	public class ParenthesizedExpression : Expression
	{
		public CSharpTokenNode LParToken {
			get { return GetChildByRole (Roles.LPar); }
		}
		
		public Expression Expression {
			get { return GetChildByRole (Roles.Expression); }
			set { SetChildByRole (Roles.Expression, value); }
		}
		
		public CSharpTokenNode RParToken {
			get { return GetChildByRole (Roles.RPar); }
		}
		
		public ParenthesizedExpression()
		{
		}
		
		public ParenthesizedExpression(Expression expr)
		{
			Expression = expr;
		}
		
		public override void AcceptVisitor (IAstVisitor visitor)
		{
			visitor.VisitParenthesizedExpression (this);
		}
			
		public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
		{
			return visitor.VisitParenthesizedExpression (this);
		}
		
		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitParenthesizedExpression (this, data);
		}
		
		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			ParenthesizedExpression o = other as ParenthesizedExpression;
			return o != null && this.Expression.DoMatch(o.Expression, match);
		}
		
		/// <summary>
		/// Gets whether the expression acts like a parenthesized expression,
		/// i.e. whether information about the expected type (for lambda type inference) flows
		/// into the inner expression.
		/// </summary>
		/// <returns>Returns true for ParenthesizedExpression, CheckedExpression or UncheckedExpression; false otherwise.</returns>
		public static bool ActsAsParenthesizedExpression(AstNode expression)
		{
			return expression is ParenthesizedExpression || expression is CheckedExpression || expression is UncheckedExpression;
		}
		
		/// <summary>
		/// Unpacks the given expression if it is a ParenthesizedExpression, CheckedExpression or UncheckedExpression.
		/// </summary>
		public static Expression UnpackParenthesizedExpression(Expression expr)
		{
			while (ActsAsParenthesizedExpression(expr))
				expr = expr.GetChildByRole(Roles.Expression);
			return expr;
		}
	}
}