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Diffstat (limited to 'src/xmlpatterns/iterators/qsubsequenceiterator.cpp')
| -rw-r--r-- | src/xmlpatterns/iterators/qsubsequenceiterator.cpp | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/xmlpatterns/iterators/qsubsequenceiterator.cpp b/src/xmlpatterns/iterators/qsubsequenceiterator.cpp new file mode 100644 index 0000000000..4d9ee96611 --- /dev/null +++ b/src/xmlpatterns/iterators/qsubsequenceiterator.cpp @@ -0,0 +1,110 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 |