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//
// CSharpUtil.cs
//
// Author:
// Mike Krüger <mkrueger@novell.com>
//
// Copyright (c) 2011 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 ICSharpCode.NRefactory.CSharp;
namespace ICSharpCode.NRefactory.CSharp
{
public static class CSharpUtil
{
/// <summary>
/// Inverts a boolean condition. Note: The condition object can be frozen (from AST) it's cloned internally.
/// </summary>
/// <param name="condition">The condition to invert.</param>
public static Expression InvertCondition (Expression condition)
{
return InvertConditionInternal (condition.Clone ());
}
static Expression InvertConditionInternal (Expression condition)
{
if (condition is ParenthesizedExpression) {
((ParenthesizedExpression)condition).Expression = InvertCondition (((ParenthesizedExpression)condition).Expression);
return condition;
}
if (condition is UnaryOperatorExpression) {
var uOp = (UnaryOperatorExpression)condition;
if (uOp.Operator == UnaryOperatorType.Not)
return uOp.Expression;
return new UnaryOperatorExpression (UnaryOperatorType.Not, uOp);
}
if (condition is BinaryOperatorExpression) {
var bOp = (BinaryOperatorExpression)condition;
var negatedOp = NegateRelationalOperator (bOp.Operator);
if (negatedOp == BinaryOperatorType.Any)
return new UnaryOperatorExpression (UnaryOperatorType.Not, new ParenthesizedExpression (condition));
bOp.Operator = negatedOp;
return bOp;
}
if (condition is ConditionalExpression) {
var cEx = condition as ConditionalExpression;
cEx.Condition = InvertCondition (cEx.Condition);
return cEx;
}
if (condition is PrimitiveExpression) {
var pex = condition as PrimitiveExpression;
if (pex.Value is bool) {
return new PrimitiveExpression (!((bool)pex.Value));
}
}
return new UnaryOperatorExpression (UnaryOperatorType.Not, condition);
}
/// <summary>
/// Get negation of the specified relational operator
/// </summary>
/// <returns>
/// negation of the specified relational operator, or BinaryOperatorType.Any if it's not a relational operator
/// </returns>
public static BinaryOperatorType NegateRelationalOperator (BinaryOperatorType op)
{
switch (op) {
case BinaryOperatorType.GreaterThan:
return BinaryOperatorType.LessThanOrEqual;
case BinaryOperatorType.GreaterThanOrEqual:
return BinaryOperatorType.LessThan;
case BinaryOperatorType.Equality:
return BinaryOperatorType.InEquality;
case BinaryOperatorType.InEquality:
return BinaryOperatorType.Equality;
case BinaryOperatorType.LessThan:
return BinaryOperatorType.GreaterThanOrEqual;
case BinaryOperatorType.LessThanOrEqual:
return BinaryOperatorType.GreaterThan;
}
return BinaryOperatorType.Any;
}
}
}
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