// 
// VariableInitializer.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
{
	public class VariableInitializer : AstNode
	{
		#region Null
		public new static readonly VariableInitializer Null = new NullVariableInitializer ();
		
		sealed class NullVariableInitializer : VariableInitializer
		{
			public override bool IsNull {
				get {
					return true;
				}
			}
			
			public override void AcceptVisitor (IAstVisitor visitor)
			{
			}
				
			public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
			{
				return default (T);
			}
			
			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
			{
				return default (S);
			}
			
			protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
			{
				return other == null || other.IsNull;
			}
		}
		#endregion

		#region PatternPlaceholder
		public static implicit operator VariableInitializer(PatternMatching.Pattern pattern)
		{
			return pattern != null ? new PatternPlaceholder(pattern) : null;
		}
		
		sealed class PatternPlaceholder : VariableInitializer, PatternMatching.INode
		{
			readonly PatternMatching.Pattern child;
			
			public PatternPlaceholder(PatternMatching.Pattern child)
			{
				this.child = child;
			}
			
			public override NodeType NodeType {
				get { return NodeType.Pattern; }
			}
			
			public override void AcceptVisitor (IAstVisitor visitor)
			{
				visitor.VisitPatternPlaceholder (this, child);
			}
				
			public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
			{
				return visitor.VisitPatternPlaceholder (this, child);
			}
			
			public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
			{
				return visitor.VisitPatternPlaceholder(this, child, data);
			}
			
			protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
			{
				return child.DoMatch(other, match);
			}
			
			bool PatternMatching.INode.DoMatchCollection(Role role, PatternMatching.INode pos, PatternMatching.Match match, PatternMatching.BacktrackingInfo backtrackingInfo)
			{
				return child.DoMatchCollection(role, pos, match, backtrackingInfo);
			}
		}
		#endregion
		
		public override NodeType NodeType {
			get {
				return NodeType.Unknown;
			}
		}
		
		public VariableInitializer()
		{
		}
		
		public VariableInitializer(string name, Expression initializer = null)
		{
			this.Name = name;
			this.Initializer = initializer;
		}

		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 CSharpTokenNode AssignToken {
			get { return GetChildByRole (Roles.Assign); }
		}
		
		public Expression Initializer {
			get { return GetChildByRole (Roles.Expression); }
			set { SetChildByRole (Roles.Expression, value); }
		}
		
		public override void AcceptVisitor (IAstVisitor visitor)
		{
			visitor.VisitVariableInitializer (this);
		}
			
		public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
		{
			return visitor.VisitVariableInitializer (this);
		}
		
		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitVariableInitializer (this, data);
		}

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