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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.NRefactory6.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis;
namespace ICSharpCode.NRefactory6.CSharp
{
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 ExpressionSyntax InvertCondition(ExpressionSyntax condition)
{
return InvertConditionInternal(condition);
}
static ExpressionSyntax InvertConditionInternal(ExpressionSyntax condition)
{
if (condition is ParenthesizedExpressionSyntax) {
return SyntaxFactory.ParenthesizedExpression(InvertCondition(((ParenthesizedExpressionSyntax)condition).Expression));
}
if (condition is PrefixUnaryExpressionSyntax) {
var uOp = (PrefixUnaryExpressionSyntax)condition;
if (uOp.IsKind(SyntaxKind.LogicalNotExpression)) {
if (!(uOp.Parent is ExpressionSyntax))
return uOp.Operand.SkipParens();
return uOp.Operand;
}
return SyntaxFactory.PrefixUnaryExpression(SyntaxKind.LogicalNotExpression, uOp);
}
if (condition is BinaryExpressionSyntax) {
var bOp = (BinaryExpressionSyntax)condition;
if (bOp.IsKind(SyntaxKind.LogicalAndExpression) || bOp.IsKind(SyntaxKind.LogicalOrExpression))
return SyntaxFactory.BinaryExpression(NegateConditionOperator(bOp.Kind()), InvertCondition(bOp.Left), InvertCondition(bOp.Right));
if (bOp.IsKind(SyntaxKind.EqualsExpression) ||
bOp.IsKind(SyntaxKind.NotEqualsExpression) ||
bOp.IsKind(SyntaxKind.GreaterThanExpression) ||
bOp.IsKind(SyntaxKind.GreaterThanOrEqualExpression) ||
bOp.IsKind(SyntaxKind.LessThanExpression) ||
bOp.IsKind(SyntaxKind.LessThanOrEqualExpression))
return SyntaxFactory.BinaryExpression(NegateRelationalOperator(bOp.Kind()), bOp.Left, bOp.Right);
return SyntaxFactory.PrefixUnaryExpression(SyntaxKind.LogicalNotExpression, SyntaxFactory.ParenthesizedExpression(condition));
}
if (condition is ConditionalExpressionSyntax) {
var cEx = condition as ConditionalExpressionSyntax;
return cEx.WithCondition(InvertCondition(cEx.Condition));
}
if (condition is LiteralExpressionSyntax) {
if (condition.Kind() == SyntaxKind.TrueLiteralExpression)
return SyntaxFactory.LiteralExpression(SyntaxKind.FalseLiteralExpression);
if (condition.Kind() == SyntaxKind.FalseLiteralExpression)
return SyntaxFactory.LiteralExpression(SyntaxKind.TrueLiteralExpression);
}
return SyntaxFactory.PrefixUnaryExpression(SyntaxKind.LogicalNotExpression, AddParensForUnaryExpressionIfRequired(condition));
}
/// <summary>
/// When negating an expression this is required, otherwise you would end up with
/// a or b -> !a or b
/// </summary>
public static ExpressionSyntax AddParensForUnaryExpressionIfRequired(ExpressionSyntax expression)
{
if ((expression is BinaryExpressionSyntax) ||
(expression is AssignmentExpressionSyntax) ||
(expression is CastExpressionSyntax) ||
(expression is ParenthesizedLambdaExpressionSyntax) ||
(expression is SimpleLambdaExpressionSyntax) ||
(expression is ConditionalExpressionSyntax)) {
return SyntaxFactory.ParenthesizedExpression(expression);
}
return expression;
}
/// <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 SyntaxKind NegateRelationalOperator(SyntaxKind op)
{
switch (op) {
case SyntaxKind.EqualsExpression:
return SyntaxKind.NotEqualsExpression;
case SyntaxKind.NotEqualsExpression:
return SyntaxKind.EqualsExpression;
case SyntaxKind.GreaterThanExpression:
return SyntaxKind.LessThanOrEqualExpression;
case SyntaxKind.GreaterThanOrEqualExpression:
return SyntaxKind.LessThanExpression;
case SyntaxKind.LessThanExpression:
return SyntaxKind.GreaterThanOrEqualExpression;
case SyntaxKind.LessThanOrEqualExpression:
return SyntaxKind.GreaterThanExpression;
case SyntaxKind.LogicalOrExpression:
return SyntaxKind.LogicalAndExpression;
case SyntaxKind.LogicalAndExpression:
return SyntaxKind.LogicalOrExpression;
}
throw new ArgumentOutOfRangeException("op");
}
/// <summary>
/// Returns true, if the specified operator is a relational operator
/// </summary>
public static bool IsRelationalOperator(SyntaxKind op)
{
switch (op) {
case SyntaxKind.EqualsExpression:
case SyntaxKind.NotEqualsExpression:
case SyntaxKind.GreaterThanExpression:
case SyntaxKind.GreaterThanOrEqualExpression:
case SyntaxKind.LessThanExpression:
case SyntaxKind.LessThanOrEqualExpression:
case SyntaxKind.LogicalOrExpression:
case SyntaxKind.LogicalAndExpression:
return true;
}
return false;
}
/// <summary>
/// Get negation of the condition operator
/// </summary>
/// <returns>
/// negation of the specified condition operator, or BinaryOperatorType.Any if it's not a condition operator
/// </returns>
public static SyntaxKind NegateConditionOperator(SyntaxKind op)
{
switch (op) {
case SyntaxKind.LogicalOrExpression:
return SyntaxKind.LogicalAndExpression;
case SyntaxKind.LogicalAndExpression:
return SyntaxKind.LogicalOrExpression;
}
throw new ArgumentOutOfRangeException("op");
}
public static bool AreConditionsEqual(ExpressionSyntax cond1, ExpressionSyntax cond2)
{
if (cond1 == null || cond2 == null)
return false;
return cond1.SkipParens().IsEquivalentTo(cond2.SkipParens(), true);
}
}
}
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