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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Ast/Expressions/AssignmentExpression.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
ImportĀ upstreamĀ versionĀ 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory.CSharp/Ast/Expressions/AssignmentExpression.cs
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ļ»æ// 
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// AssignmentExpression.cs
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//
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// Author:
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//       Mike KrĆ¼ger <mkrueger@novell.com>
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// 
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// Copyright (c) 2009 Novell, Inc (http://www.novell.com)
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// 
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Linq.Expressions;
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namespace ICSharpCode.NRefactory.CSharp
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{
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        /// <summary>
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        /// Left Operator= Right
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        /// </summary>
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        public class AssignmentExpression : Expression
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        {
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                // reuse roles from BinaryOperatorExpression
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                public readonly static Role<Expression> LeftRole = BinaryOperatorExpression.LeftRole;
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                public readonly static Role<Expression> RightRole = BinaryOperatorExpression.RightRole;
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                public readonly static TokenRole AssignRole = new TokenRole ("=");
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                public readonly static TokenRole AddRole = new TokenRole ("+=");
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                public readonly static TokenRole SubtractRole = new TokenRole ("-=");
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                public readonly static TokenRole MultiplyRole = new TokenRole ("*=");
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                public readonly static TokenRole DivideRole = new TokenRole ("/=");
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                public readonly static TokenRole ModulusRole = new TokenRole ("%=");
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                public readonly static TokenRole ShiftLeftRole = new TokenRole ("<<=");
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                public readonly static TokenRole ShiftRightRole = new TokenRole (">>=");
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                public readonly static TokenRole BitwiseAndRole = new TokenRole ("&=");
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                public readonly static TokenRole BitwiseOrRole = new TokenRole ("|=");
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                public readonly static TokenRole ExclusiveOrRole = new TokenRole ("^=");
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                public AssignmentExpression()
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                {
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                }
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                public AssignmentExpression(Expression left, Expression right)
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                {
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                        this.Left = left;
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                        this.Right = right;
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                }
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                public AssignmentExpression(Expression left, AssignmentOperatorType op, Expression right)
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                {
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                        this.Left = left;
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                        this.Operator = op;
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                        this.Right = right;
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                }
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                public AssignmentOperatorType Operator {
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                        get;
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                        set;
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                }
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                public Expression Left {
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                        get { return GetChildByRole (LeftRole); }
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                        set { SetChildByRole(LeftRole, value); }
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                }
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                public CSharpTokenNode OperatorToken {
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                        get { return GetChildByRole (GetOperatorRole(Operator)); }
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                }
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                public Expression Right {
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                        get { return GetChildByRole (RightRole); }
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                        set { SetChildByRole(RightRole, value); }
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                }
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                public override void AcceptVisitor (IAstVisitor visitor)
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                {
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                        visitor.VisitAssignmentExpression (this);
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                }
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                public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
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                {
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                        return visitor.VisitAssignmentExpression (this);
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                }
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                public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
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                {
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                        return visitor.VisitAssignmentExpression (this, data);
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                }
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                protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
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                {
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                        AssignmentExpression o = other as AssignmentExpression;
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                        return o != null && (this.Operator == AssignmentOperatorType.Any || this.Operator == o.Operator)
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                                && this.Left.DoMatch(o.Left, match) && this.Right.DoMatch(o.Right, match);
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                }
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                public static TokenRole GetOperatorRole(AssignmentOperatorType op)
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                {
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                        switch (op) {
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                                case AssignmentOperatorType.Assign:
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                                        return AssignRole;
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                                case AssignmentOperatorType.Add:
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                                        return AddRole;
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                                case AssignmentOperatorType.Subtract:
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                                        return SubtractRole;
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                                case AssignmentOperatorType.Multiply:
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                                        return MultiplyRole;
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                                case AssignmentOperatorType.Divide:
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                                        return DivideRole;
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                                case AssignmentOperatorType.Modulus:
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                                        return ModulusRole;
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                                case AssignmentOperatorType.ShiftLeft:
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                                        return ShiftLeftRole;
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                                case AssignmentOperatorType.ShiftRight:
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                                        return ShiftRightRole;
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                                case AssignmentOperatorType.BitwiseAnd:
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                                        return BitwiseAndRole;
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                                case AssignmentOperatorType.BitwiseOr:
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                                        return BitwiseOrRole;
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                                case AssignmentOperatorType.ExclusiveOr:
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                                        return ExclusiveOrRole;
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                                default:
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                                        throw new NotSupportedException("Invalid value for AssignmentOperatorType");
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                        }
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                }
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                /// <summary>
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                /// Gets the binary operator for the specified compound assignment operator.
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                /// Returns null if 'op' is not a compound assignment.
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                /// </summary>
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                public static BinaryOperatorType? GetCorrespondingBinaryOperator(AssignmentOperatorType op)
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                {
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                        switch (op) {
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                                case AssignmentOperatorType.Assign:
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                                        return null;
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                                case AssignmentOperatorType.Add:
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                                        return BinaryOperatorType.Add;
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                                case AssignmentOperatorType.Subtract:
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                                        return BinaryOperatorType.Subtract;
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                                case AssignmentOperatorType.Multiply:
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                                        return BinaryOperatorType.Multiply;
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                                case AssignmentOperatorType.Divide:
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                                        return BinaryOperatorType.Divide;
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                                case AssignmentOperatorType.Modulus:
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                                        return BinaryOperatorType.Modulus;
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                                case AssignmentOperatorType.ShiftLeft:
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                                        return BinaryOperatorType.ShiftLeft;
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                                case AssignmentOperatorType.ShiftRight:
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                                        return BinaryOperatorType.ShiftRight;
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                                case AssignmentOperatorType.BitwiseAnd:
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                                        return BinaryOperatorType.BitwiseAnd;
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                                case AssignmentOperatorType.BitwiseOr:
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                                        return BinaryOperatorType.BitwiseOr;
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                                case AssignmentOperatorType.ExclusiveOr:
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                                        return BinaryOperatorType.ExclusiveOr;
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                                default:
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                                        throw new NotSupportedException("Invalid value for AssignmentOperatorType");
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                        }
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                }
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                public static ExpressionType GetLinqNodeType(AssignmentOperatorType op, bool checkForOverflow)
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                {
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                        switch (op) {
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                                case AssignmentOperatorType.Assign:
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                                        return ExpressionType.Assign;
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                                case AssignmentOperatorType.Add:
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                                        return checkForOverflow ? ExpressionType.AddAssignChecked : ExpressionType.AddAssign;
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                                case AssignmentOperatorType.Subtract:
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                                        return checkForOverflow ? ExpressionType.SubtractAssignChecked : ExpressionType.SubtractAssign;
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                                case AssignmentOperatorType.Multiply:
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                                        return checkForOverflow ? ExpressionType.MultiplyAssignChecked : ExpressionType.MultiplyAssign;
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                                case AssignmentOperatorType.Divide:
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                                        return ExpressionType.DivideAssign;
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                                case AssignmentOperatorType.Modulus:
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                                        return ExpressionType.ModuloAssign;
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                                case AssignmentOperatorType.ShiftLeft:
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                                        return ExpressionType.LeftShiftAssign;
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                                case AssignmentOperatorType.ShiftRight:
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                                        return ExpressionType.RightShiftAssign;
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                                case AssignmentOperatorType.BitwiseAnd:
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                                        return ExpressionType.AndAssign;
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                                case AssignmentOperatorType.BitwiseOr:
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                                        return ExpressionType.OrAssign;
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                                case AssignmentOperatorType.ExclusiveOr:
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                                        return ExpressionType.ExclusiveOrAssign;
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                                default:
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                                        throw new NotSupportedException("Invalid value for AssignmentOperatorType");
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                        }
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                }
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        }
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        public enum AssignmentOperatorType
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        {
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                /// <summary>left = right</summary>
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                Assign,
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                /// <summary>left += right</summary>
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                Add,
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                /// <summary>left -= right</summary>
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                Subtract,
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                /// <summary>left *= right</summary>
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                Multiply,
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                /// <summary>left /= right</summary>
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                Divide,
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                /// <summary>left %= right</summary>
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                Modulus,
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                /// <summary>left <<= right</summary>
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                ShiftLeft,
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                /// <summary>left >>= right</summary>
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                ShiftRight,
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                /// <summary>left &= right</summary>
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                BitwiseAnd,
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                /// <summary>left |= right</summary>
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                BitwiseOr,
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                /// <summary>left ^= right</summary>
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                ExclusiveOr,
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                /// <summary>Any operator (for pattern matching)</summary>
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                Any
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        }
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}