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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qarithmeticexpression_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qschemanumeric_p.h"
#include "qunaryexpression_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
UnaryExpression::UnaryExpression(const AtomicMathematician::Operator op,
const Expression::Ptr &operand,
const StaticContext::Ptr &context) : ArithmeticExpression(wrapLiteral(CommonValues::IntegerZero, context, operand.data()),
op,
operand)
{
Q_ASSERT(op == AtomicMathematician::Substract ||
op == AtomicMathematician::Add);
Q_ASSERT(context);
}
Item UnaryExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
{
if(operatorID() == AtomicMathematician::Substract)
{
const Item item(m_operand2->evaluateSingleton(context));
if(item)
return item.as<Numeric>()->toNegated();
else
return Item();
}
else
return m_operand2->evaluateSingleton(context);
}
QT_END_NAMESPACE
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