source: trunk/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Ast/Expressions/PrimitiveExpression.cs @ 15682

// 
// PrimitiveExpression.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>
  /// Represents a literal value.
  /// </summary>
  public class PrimitiveExpression : Expression
  {
    public static readonly object AnyValue = new object();
    
    TextLocation startLocation;
    public override TextLocation StartLocation {
      get {
        return startLocation;
      }
    }
    
    internal void SetStartLocation(TextLocation value)
    {
      ThrowIfFrozen();
      this.startLocation = value;
      this.endLocation = null;
    }
    
    string literalValue;
    TextLocation? endLocation;
    public override TextLocation EndLocation {
      get {
        if (!endLocation.HasValue) {
          endLocation = value is string ? AdvanceLocation (StartLocation, literalValue ?? "") :
            new TextLocation (StartLocation.Line, StartLocation.Column + (literalValue ?? "").Length);
        }
        return endLocation.Value;
      }
    }
    
    object value;
    
    public object Value {
      get { return this.value; }
      set {
        ThrowIfFrozen();
        this.value = value;
        literalValue = null;
      }
    }
    
    /// <remarks>Never returns null.</remarks>
    public string LiteralValue {
      get { return literalValue ?? ""; }
    }
    
    /// <remarks>Can be null.</remarks>
    public string UnsafeLiteralValue {
      get { return literalValue; }
    }
    
    public void SetValue(object value, string literalValue)
    {
      if (value == null)
        throw new ArgumentNullException();
      ThrowIfFrozen();
      this.value = value;
      this.literalValue = literalValue;
    }
    
    public PrimitiveExpression (object value)
    {
      this.Value = value;
      this.literalValue = null;
    }
    
    public PrimitiveExpression (object value, string literalValue)
    {
      this.Value = value;
      this.literalValue = literalValue;
    }
    
    public PrimitiveExpression (object value, TextLocation startLocation, string literalValue)
    {
      this.Value = value;
      this.startLocation = startLocation;
      this.literalValue = literalValue;
    }
    
    public override void AcceptVisitor (IAstVisitor visitor)
    {
      visitor.VisitPrimitiveExpression (this);
    }
    
    public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
    {
      return visitor.VisitPrimitiveExpression (this);
    }
    
    public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
    {
      return visitor.VisitPrimitiveExpression (this, data);
    }

    unsafe static TextLocation AdvanceLocation(TextLocation startLocation, string str)
    {
      int line = startLocation.Line;
      int col  = startLocation.Column;
      fixed (char* start = str) {
        char* p = start;
        char* endPtr = start + str.Length;
        while (p < endPtr) {
          var nl = NewLine.GetDelimiterLength(*p, () => {
            char* nextp = p + 1;
            if (nextp < endPtr)
              return *nextp;
            return '\0';
          });
          if (nl > 0) {
            line++;
            col = 1;
            if (nl == 2)
              p++;
          } else {
            col++;
          }
          p++;
        }
      }
      return new TextLocation (line, col);
    }
    
    protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
    {
      PrimitiveExpression o = other as PrimitiveExpression;
      return o != null && (this.Value == AnyValue || object.Equals(this.Value, o.Value));
    }
  }
}