source: branches/2389-EpsLexicase/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Ast/Expressions/UnaryOperatorExpression.cs

// 
// UnaryOperatorExpression.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;
using System.Linq.Expressions;

namespace ICSharpCode.NRefactory.CSharp
{
  /// <summary>
  /// Operator Expression
  /// </summary>
  public class UnaryOperatorExpression : Expression
  {
    public readonly static TokenRole NotRole = new TokenRole ("!");
    public readonly static TokenRole BitNotRole = new TokenRole ("~");
    public readonly static TokenRole MinusRole = new TokenRole ("-");
    public readonly static TokenRole PlusRole = new TokenRole ("+");
    public readonly static TokenRole IncrementRole = new TokenRole ("++");
    public readonly static TokenRole DecrementRole = new TokenRole ("--");
    public readonly static TokenRole DereferenceRole = new TokenRole ("*");
    public readonly static TokenRole AddressOfRole = new TokenRole ("&");
    public readonly static TokenRole AwaitRole = new TokenRole ("await");
    
    public UnaryOperatorExpression()
    {
    }
    
    public UnaryOperatorExpression(UnaryOperatorType op, Expression expression)
    {
      this.Operator = op;
      this.Expression = expression;
    }
    
    public UnaryOperatorType Operator {
      get;
      set;
    }
    
    public CSharpTokenNode OperatorToken {
      get { return GetChildByRole (GetOperatorRole (Operator)); }
    }

    static Expression NoUnaryExpressionError = new ErrorExpression ("No unary expression");
    public Expression Expression {
      get { return GetChildByRole (Roles.Expression) ?? NoUnaryExpressionError; }
      set { SetChildByRole (Roles.Expression, value); }
    }
    
    public override void AcceptVisitor (IAstVisitor visitor)
    {
      visitor.VisitUnaryOperatorExpression (this);
    }
      
    public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
    {
      return visitor.VisitUnaryOperatorExpression (this);
    }
    
    public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
    {
      return visitor.VisitUnaryOperatorExpression (this, data);
    }
    
    protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
    {
      UnaryOperatorExpression o = other as UnaryOperatorExpression;
      return o != null && (this.Operator == UnaryOperatorType.Any || this.Operator == o.Operator)
        && this.Expression.DoMatch(o.Expression, match);
    }
    
    public static TokenRole GetOperatorRole(UnaryOperatorType op)
    {
      switch (op) {
        case UnaryOperatorType.Not:
          return NotRole;
        case UnaryOperatorType.BitNot:
          return BitNotRole;
        case UnaryOperatorType.Minus:
          return MinusRole;
        case UnaryOperatorType.Plus:
          return PlusRole;
        case UnaryOperatorType.Increment:
        case UnaryOperatorType.PostIncrement:
          return IncrementRole;
        case UnaryOperatorType.PostDecrement:
        case UnaryOperatorType.Decrement:
          return DecrementRole;
        case UnaryOperatorType.Dereference:
          return DereferenceRole;
        case UnaryOperatorType.AddressOf:
          return AddressOfRole;
        case UnaryOperatorType.Await:
          return AwaitRole;
        default:
          throw new NotSupportedException("Invalid value for UnaryOperatorType");
      }
    }
    
    public static ExpressionType GetLinqNodeType(UnaryOperatorType op, bool checkForOverflow)
    {
      switch (op) {
        case UnaryOperatorType.Not:
          return ExpressionType.Not;
        case UnaryOperatorType.BitNot:
          return ExpressionType.OnesComplement;
        case UnaryOperatorType.Minus:
          return checkForOverflow ? ExpressionType.NegateChecked : ExpressionType.Negate;
        case UnaryOperatorType.Plus:
          return ExpressionType.UnaryPlus;
        case UnaryOperatorType.Increment:
          return ExpressionType.PreIncrementAssign;
        case UnaryOperatorType.Decrement:
          return ExpressionType.PreDecrementAssign;
        case UnaryOperatorType.PostIncrement:
          return ExpressionType.PostIncrementAssign;
        case UnaryOperatorType.PostDecrement:
          return ExpressionType.PostDecrementAssign;
        case UnaryOperatorType.Dereference:
        case UnaryOperatorType.AddressOf:
        case UnaryOperatorType.Await:
          return ExpressionType.Extension;
        default:
          throw new NotSupportedException("Invalid value for UnaryOperatorType");
      }
    }
  }
  
  public enum UnaryOperatorType
  {
    /// <summary>
    /// Any unary operator (used in pattern matching)
    /// </summary>
    Any,
    
    /// <summary>Logical not (!a)</summary>
    Not,
    /// <summary>Bitwise not (~a)</summary>
    BitNot,
    /// <summary>Unary minus (-a)</summary>
    Minus,
    /// <summary>Unary plus (+a)</summary>
    Plus,
    /// <summary>Pre increment (++a)</summary>
    Increment,
    /// <summary>Pre decrement (--a)</summary>
    Decrement,
    /// <summary>Post increment (a++)</summary>
    PostIncrement,
    /// <summary>Post decrement (a--)</summary>
    PostDecrement,
    /// <summary>Dereferencing (*a)</summary>
    Dereference,
    /// <summary>Get address (&a)</summary>
    AddressOf,
    /// <summary>C# 5.0 await</summary>
    Await
  }
}