| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
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| ** GNU Lesser General Public License Usage |
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| ** General Public License version 3 as published by the Free Software |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
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| ****************************************************************************/ |
| |
| #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 |