source: branches/2893_BNLR/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Ast/Identifier.cs

// 
// Identifier.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
{
  public class Identifier : AstNode
  {
    public new static readonly Identifier Null = new NullIdentifier ();
    sealed class NullIdentifier : Identifier
    {
      public override bool IsNull {
        get {
          return true;
        }
      }
      
      public override void AcceptVisitor (IAstVisitor visitor)
      {
        visitor.VisitNullNode(this);
      }
      
      public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
      {
        return visitor.VisitNullNode(this);
      }
      
      public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
      {
        return visitor.VisitNullNode(this, data);
      }
      
      protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
      {
        return other == null || other.IsNull;
      }
    }
    
    public override NodeType NodeType {
      get {
        return NodeType.Token;
      }
    }
    
    string name;
    public string Name {
      get { return this.name; }
      set {
        if (value == null)
          throw new ArgumentNullException("value");
        ThrowIfFrozen();
        this.name = value;
      }
    }
    
    TextLocation startLocation;
    public override TextLocation StartLocation {
      get {
        return startLocation;
      }
    }
    
    internal void SetStartLocation(TextLocation value)
    {
      ThrowIfFrozen();
      this.startLocation = value;
    }
    
    const uint verbatimBit = 1u << AstNodeFlagsUsedBits;
    
    public bool IsVerbatim {
      get {
        return (flags & verbatimBit) != 0;
      }
      set {
        ThrowIfFrozen();
        if (value)
          flags |= verbatimBit;
        else
          flags &= ~verbatimBit;
      }
    }
    
    public override TextLocation EndLocation {
      get {
        return new TextLocation (StartLocation.Line, StartLocation.Column + (Name ?? "").Length + (IsVerbatim ? 1 : 0));
      }
    }
    
    Identifier ()
    {
      this.name = string.Empty;
    }
    
    protected Identifier (string name, TextLocation location)
    {
      if (name == null)
        throw new ArgumentNullException("name");
      this.Name = name;
      this.startLocation = location;
    }

    public static Identifier Create (string name)
    {
      return Create (name, TextLocation.Empty);
    }

    public static Identifier Create (string name, TextLocation location)
    {
      if (string.IsNullOrEmpty(name))
        return Identifier.Null;
      if (name[0] == '@')
        return new Identifier (name.Substring (1), new TextLocation (location.Line, location.Column + 1)) { IsVerbatim = true };
      else
        return new Identifier (name, location);
    }
    
    public static Identifier Create (string name, TextLocation location, bool isVerbatim)
    {
      if (string.IsNullOrEmpty (name))
        return Identifier.Null;
      
      if (isVerbatim)
        return new Identifier (name, location) { IsVerbatim = true };
      return new Identifier (name, location);
    }
    
    public override void AcceptVisitor (IAstVisitor visitor)
    {
      visitor.VisitIdentifier (this);
    }
    
    public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
    {
      return visitor.VisitIdentifier (this);
    }
    
    public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
    {
      return visitor.VisitIdentifier (this, data);
    }
    
    protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
    {
      Identifier o = other as Identifier;
      return o != null && !o.IsNull && MatchString(this.Name, o.Name);
    }
  }
}