source: stable/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Ast/Expressions/AssignmentExpression.cs @ 11937

// 
// AssignmentExpression.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;
using System.Collections.Generic;

namespace ICSharpCode.NRefactory.CSharp
{
  /// <summary>
  /// Left Operator= Right
  /// </summary>
  public class AssignmentExpression : Expression
  {
    // reuse roles from BinaryOperatorExpression
    public readonly static Role<Expression> LeftRole = BinaryOperatorExpression.LeftRole;
    public readonly static Role<Expression> RightRole = BinaryOperatorExpression.RightRole;
    
    public readonly static TokenRole AssignRole = new TokenRole ("=");
    public readonly static TokenRole AddRole = new TokenRole ("+=");
    public readonly static TokenRole SubtractRole = new TokenRole ("-=");
    public readonly static TokenRole MultiplyRole = new TokenRole ("*=");
    public readonly static TokenRole DivideRole = new TokenRole ("/=");
    public readonly static TokenRole ModulusRole = new TokenRole ("%=");
    public readonly static TokenRole ShiftLeftRole = new TokenRole ("<<=");
    public readonly static TokenRole ShiftRightRole = new TokenRole (">>=");
    public readonly static TokenRole BitwiseAndRole = new TokenRole ("&=");
    public readonly static TokenRole BitwiseOrRole = new TokenRole ("|=");
    public readonly static TokenRole ExclusiveOrRole = new TokenRole ("^=");
    
    public AssignmentExpression()
    {
    }
    
    public AssignmentExpression(Expression left, Expression right)
    {
      this.Left = left;
      this.Right = right;
    }
    
    public AssignmentExpression(Expression left, AssignmentOperatorType op, Expression right)
    {
      this.Left = left;
      this.Operator = op;
      this.Right = right;
    }
    
    public AssignmentOperatorType Operator {
      get;
      set;
    }
    
    public Expression Left {
      get { return GetChildByRole (LeftRole); }
      set { SetChildByRole(LeftRole, value); }
    }
    
    public CSharpTokenNode OperatorToken {
      get { return GetChildByRole (GetOperatorRole(Operator)); }
    }
    
    public Expression Right {
      get { return GetChildByRole (RightRole); }
      set { SetChildByRole(RightRole, value); }
    }
    
    public override void AcceptVisitor (IAstVisitor visitor)
    {
      visitor.VisitAssignmentExpression (this);
    }
      
    public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
    {
      return visitor.VisitAssignmentExpression (this);
    }
    
    public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
    {
      return visitor.VisitAssignmentExpression (this, data);
    }
    
    protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
    {
      AssignmentExpression o = other as AssignmentExpression;
      return o != null && (this.Operator == AssignmentOperatorType.Any || this.Operator == o.Operator)
        && this.Left.DoMatch(o.Left, match) && this.Right.DoMatch(o.Right, match);
    }
    
    public static TokenRole GetOperatorRole(AssignmentOperatorType op)
    {
      switch (op) {
        case AssignmentOperatorType.Assign:
          return AssignRole;
        case AssignmentOperatorType.Add:
          return AddRole;
        case AssignmentOperatorType.Subtract:
          return SubtractRole;
        case AssignmentOperatorType.Multiply:
          return MultiplyRole;
        case AssignmentOperatorType.Divide:
          return DivideRole;
        case AssignmentOperatorType.Modulus:
          return ModulusRole;
        case AssignmentOperatorType.ShiftLeft:
          return ShiftLeftRole;
        case AssignmentOperatorType.ShiftRight:
          return ShiftRightRole;
        case AssignmentOperatorType.BitwiseAnd:
          return BitwiseAndRole;
        case AssignmentOperatorType.BitwiseOr:
          return BitwiseOrRole;
        case AssignmentOperatorType.ExclusiveOr:
          return ExclusiveOrRole;
        default:
          throw new NotSupportedException("Invalid value for AssignmentOperatorType");
      }
    }
    
    /// <summary>
    /// Gets the binary operator for the specified compound assignment operator.
    /// Returns null if 'op' is not a compound assignment.
    /// </summary>
    public static BinaryOperatorType? GetCorrespondingBinaryOperator(AssignmentOperatorType op)
    {
      switch (op) {
        case AssignmentOperatorType.Assign:
          return null;
        case AssignmentOperatorType.Add:
          return BinaryOperatorType.Add;
        case AssignmentOperatorType.Subtract:
          return BinaryOperatorType.Subtract;
        case AssignmentOperatorType.Multiply:
          return BinaryOperatorType.Multiply;
        case AssignmentOperatorType.Divide:
          return BinaryOperatorType.Divide;
        case AssignmentOperatorType.Modulus:
          return BinaryOperatorType.Modulus;
        case AssignmentOperatorType.ShiftLeft:
          return BinaryOperatorType.ShiftLeft;
        case AssignmentOperatorType.ShiftRight:
          return BinaryOperatorType.ShiftRight;
        case AssignmentOperatorType.BitwiseAnd:
          return BinaryOperatorType.BitwiseAnd;
        case AssignmentOperatorType.BitwiseOr:
          return BinaryOperatorType.BitwiseOr;
        case AssignmentOperatorType.ExclusiveOr:
          return BinaryOperatorType.ExclusiveOr;
        default:
          throw new NotSupportedException("Invalid value for AssignmentOperatorType");
      }
    }
    
    public static ExpressionType GetLinqNodeType(AssignmentOperatorType op, bool checkForOverflow)
    {
      switch (op) {
        case AssignmentOperatorType.Assign:
          return ExpressionType.Assign;
        case AssignmentOperatorType.Add:
          return checkForOverflow ? ExpressionType.AddAssignChecked : ExpressionType.AddAssign;
        case AssignmentOperatorType.Subtract:
          return checkForOverflow ? ExpressionType.SubtractAssignChecked : ExpressionType.SubtractAssign;
        case AssignmentOperatorType.Multiply:
          return checkForOverflow ? ExpressionType.MultiplyAssignChecked : ExpressionType.MultiplyAssign;
        case AssignmentOperatorType.Divide:
          return ExpressionType.DivideAssign;
        case AssignmentOperatorType.Modulus:
          return ExpressionType.ModuloAssign;
        case AssignmentOperatorType.ShiftLeft:
          return ExpressionType.LeftShiftAssign;
        case AssignmentOperatorType.ShiftRight:
          return ExpressionType.RightShiftAssign;
        case AssignmentOperatorType.BitwiseAnd:
          return ExpressionType.AndAssign;
        case AssignmentOperatorType.BitwiseOr:
          return ExpressionType.OrAssign;
        case AssignmentOperatorType.ExclusiveOr:
          return ExpressionType.ExclusiveOrAssign;
        default:
          throw new NotSupportedException("Invalid value for AssignmentOperatorType");
      }
    }

    #region Builder methods
    public override MemberReferenceExpression Member(string memberName)
    {
      return new MemberReferenceExpression { Target = this, MemberName = memberName };
    }

    public override IndexerExpression Indexer(IEnumerable<Expression> arguments)
    {
      IndexerExpression expr = new IndexerExpression();
      expr.Target = new ParenthesizedExpression(this);
      expr.Arguments.AddRange(arguments);
      return expr;
    }

    public override IndexerExpression Indexer(params Expression[] arguments)
    {
      IndexerExpression expr = new IndexerExpression();
      expr.Target = new ParenthesizedExpression(this);
      expr.Arguments.AddRange(arguments);
      return expr;
    }

    public override InvocationExpression Invoke(string methodName, IEnumerable<AstType> typeArguments, IEnumerable<Expression> arguments)
    {
      InvocationExpression ie = new InvocationExpression();
      MemberReferenceExpression mre = new MemberReferenceExpression();
      mre.Target = new ParenthesizedExpression(this);
      mre.MemberName = methodName;
      mre.TypeArguments.AddRange(typeArguments);
      ie.Target = mre;
      ie.Arguments.AddRange(arguments);
      return ie;
    }

    public override InvocationExpression Invoke(IEnumerable<Expression> arguments)
    {
      InvocationExpression ie = new InvocationExpression();
      ie.Target = new ParenthesizedExpression(this);
      ie.Arguments.AddRange(arguments);
      return ie;
    }

    public override InvocationExpression Invoke(params Expression[] arguments)
    {
      InvocationExpression ie = new InvocationExpression();
      ie.Target = new ParenthesizedExpression(this);
      ie.Arguments.AddRange(arguments);
      return ie;
    }

    public override CastExpression CastTo(AstType type)
    {
      return new CastExpression { Type = type,  Expression = new ParenthesizedExpression(this) };
    }

    public override AsExpression CastAs(AstType type)
    {
      return new AsExpression { Type = type,  Expression = new ParenthesizedExpression(this) };
    }

    public override IsExpression IsType(AstType type)
    {
      return new IsExpression { Type = type,  Expression = new ParenthesizedExpression(this) };
    }
    #endregion
  }
  
  public enum AssignmentOperatorType
  {
    /// <summary>left = right</summary>
    Assign,
    
    /// <summary>left += right</summary>
    Add,
    /// <summary>left -= right</summary>
    Subtract,
    /// <summary>left *= right</summary>
    Multiply,
    /// <summary>left /= right</summary>
    Divide,
    /// <summary>left %= right</summary>
    Modulus,
    
    /// <summary>left <<= right</summary>
    ShiftLeft,
    /// <summary>left >>= right</summary>
    ShiftRight,
    
    /// <summary>left &= right</summary>
    BitwiseAnd,
    /// <summary>left |= right</summary>
    BitwiseOr,
    /// <summary>left ^= right</summary>
    ExclusiveOr,
    
    /// <summary>Any operator (for pattern matching)</summary>
    Any
  }
}