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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 "qxpathhelper_p.h"
#include "qsubsequenceiterator_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
SubsequenceIterator::SubsequenceIterator(const Item::Iterator::Ptr &iterator,
const xsInteger start,
const xsInteger len)
: m_position(0),
m_it(iterator),
m_counter(start),
m_start(start),
m_len(len),
m_stop(m_start + m_len)
{
Q_ASSERT(iterator);
Q_ASSERT(start >= 1);
Q_ASSERT(len == -1 || len >= 1);
/* Note, "The first item of a sequence is located at position 1, not position 0." */
for(xsInteger i = 1; i != m_start; ++i)
m_it->next();
}
Item SubsequenceIterator::next()
{
if(m_position == -1)
return Item();
m_current = m_it->next();
++m_position;
if(m_len == -1)
{
if(!m_current)
m_position = -1;
return m_current;
}
++m_counter;
if(!(m_counter > m_stop) && m_current)
return m_current;
m_position = -1;
m_current.reset();
return Item();
}
Item SubsequenceIterator::current() const
{
return m_current;
}
xsInteger SubsequenceIterator::position() const
{
return m_position;
}
Item::Iterator::Ptr SubsequenceIterator::copy() const
{
return Item::Iterator::Ptr(new SubsequenceIterator(m_it->copy(), m_start, m_len));
}
QT_END_NAMESPACE
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