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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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)
// If the item is an untypedAtomic (or atomicString), the cast to Numeric will
// return a garbage object and will most likely cause a crash.
// There is simply no way to static cast from an instance of AtomicString to a Number.
return item.as<Numeric>()->toNegated();
else
return Item();
}
else
return m_operand2->evaluateSingleton(context);
}
QT_END_NAMESPACE
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