/NRefactory/ICSharpCode.NRefactory.CSharp/Ast/CSharpTokenNode.cs

  1// 
  2// TokenNode.cs
  3//  
  4// Author:
  5//       Mike Krüger <mkrueger@novell.com>
  6// 
  7// Copyright (c) 2010 Novell, Inc (http://www.novell.com)
  8// 
  9// Permission is hereby granted, free of charge, to any person obtaining a copy
 10// of this software and associated documentation files (the "Software"), to deal
 11// in the Software without restriction, including without limitation the rights
 12// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 13// copies of the Software, and to permit persons to whom the Software is
 14// furnished to do so, subject to the following conditions:
 15// 
 16// The above copyright notice and this permission notice shall be included in
 17// all copies or substantial portions of the Software.
 18// 
 19// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 20// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 21// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 22// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 23// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 24// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 25// THE SOFTWARE.
 26using System;
 27
 28namespace ICSharpCode.NRefactory.CSharp
 29{
 30	/// <summary>
 31	/// Represents a token in C#. Note that the type of the token is defined through the TokenRole.
 32	/// </summary>
 33	/// <remarks>
 34	/// In all non null c# token nodes the Role of a CSharpToken must be a TokenRole.
 35	/// </remarks>
 36	public class CSharpTokenNode : AstNode
 37	{
 38		public static new readonly CSharpTokenNode Null = new NullCSharpTokenNode ();
 39		class NullCSharpTokenNode : CSharpTokenNode
 40		{
 41			public override bool IsNull {
 42				get {
 43					return true;
 44				}
 45			}
 46			
 47			public NullCSharpTokenNode () : base (TextLocation.Empty, null)
 48			{
 49			}
 50			
 51			public override void AcceptVisitor (IAstVisitor visitor)
 52			{
 53				visitor.VisitNullNode(this);
 54			}
 55			
 56			public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
 57			{
 58				return visitor.VisitNullNode(this);
 59			}
 60			
 61			public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
 62			{
 63				return visitor.VisitNullNode(this, data);
 64			}
 65			
 66			protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 67			{
 68				return other == null || other.IsNull;
 69			}
 70		}
 71		
 72		public override NodeType NodeType {
 73			get {
 74				return NodeType.Token;
 75			}
 76		}
 77		
 78		TextLocation startLocation;
 79		public override TextLocation StartLocation {
 80			get {
 81				return startLocation;
 82			}
 83		}
 84
 85		int TokenLength {
 86			get {
 87				return TokenRole.TokenLengths [(int)(this.flags >> AstNodeFlagsUsedBits)];
 88			}
 89		}
 90		
 91		public override TextLocation EndLocation {
 92			get {
 93				return new TextLocation (StartLocation.Line, StartLocation.Column + TokenLength);
 94			}
 95		}
 96
 97		public CSharpTokenNode (TextLocation location, TokenRole role)
 98		{
 99			this.startLocation = location;
100			if (role != null)
101				this.flags |= role.TokenIndex << AstNodeFlagsUsedBits;
102		}
103
104		public override string ToString(CSharpFormattingOptions formattingOptions)
105		{
106			return TokenRole.Tokens [(int)(this.flags >> AstNodeFlagsUsedBits)];
107		}
108
109		public override void AcceptVisitor (IAstVisitor visitor)
110		{
111			visitor.VisitCSharpTokenNode (this);
112		}
113			
114		public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
115		{
116			return visitor.VisitCSharpTokenNode (this);
117		}
118		
119		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
120		{
121			return visitor.VisitCSharpTokenNode (this, data);
122		}
123		
124		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
125		{
126			CSharpTokenNode o = other as CSharpTokenNode;
127			return o != null && !o.IsNull && !(o is CSharpModifierToken);
128		}
129	}
130}
131