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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 "qinteger_p.h"
#include "qrangeiterator_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
RangeIterator::RangeIterator(const xsInteger start,
const Direction direction,
const xsInteger end)
: m_start(start),
m_end(end),
m_position(0),
m_count(start),
m_direction(direction),
m_increment(m_direction == Forward ? 1 : -1)
{
Q_ASSERT(m_start < m_end);
Q_ASSERT(m_direction == Backward || m_direction == Forward);
if(m_direction == Backward)
{
qSwap(m_start, m_end);
m_count = m_start;
}
}
Item RangeIterator::next()
{
if(m_position == -1)
return Item();
else if((m_direction == Forward && m_count > m_end) ||
(m_direction == Backward && m_count < m_end))
{
m_position = -1;
m_current.reset();
return Item();
}
else
{
m_current = Integer::fromValue(m_count);
m_count += m_increment;
++m_position;
return m_current;
}
}
xsInteger RangeIterator::count()
{
/* This complication is for handling that m_start & m_end may be reversed. */
xsInteger ret;
if(m_start < m_end)
ret = m_end - m_start;
else
ret = m_start - m_end;
return ret + 1;
}
Item::Iterator::Ptr RangeIterator::toReversed()
{
return Item::Iterator::Ptr(new RangeIterator(m_start, Backward, m_end));
}
Item RangeIterator::current() const
{
return m_current;
}
xsInteger RangeIterator::position() const
{
return m_position;
}
Item::Iterator::Ptr RangeIterator::copy() const
{
if(m_direction == Backward)
return Item::Iterator::Ptr(new RangeIterator(m_end, Backward, m_start));
else
return Item::Iterator::Ptr(new RangeIterator(m_start, Forward, m_end));
}
QT_END_NAMESPACE
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