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Diffstat (limited to 'src/xmlpatterns/iterators/qexceptiterator.cpp')
| -rw-r--r-- | src/xmlpatterns/iterators/qexceptiterator.cpp | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/xmlpatterns/iterators/qexceptiterator.cpp b/src/xmlpatterns/iterators/qexceptiterator.cpp new file mode 100644 index 0000000000..68609f7d35 --- /dev/null +++ b/src/xmlpatterns/iterators/qexceptiterator.cpp @@ -0,0 +1,122 @@ +/**************************************************************************** +** +** 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 "qitem_p.h" + +#include "qexceptiterator_p.h" + +QT_BEGIN_NAMESPACE + +using namespace QPatternist; + +ExceptIterator::ExceptIterator(const Item::Iterator::Ptr &it1, + const Item::Iterator::Ptr &it2) : m_it1(it1) + , m_it2(it2) + , m_position(0) + , m_node1(m_it1->next()) + , m_node2(m_it2->next()) +{ + Q_ASSERT(m_it1); + Q_ASSERT(m_it2); +} + +Item ExceptIterator::fromFirstOperand() +{ + ++m_position; + m_current = m_node1; + m_node1 = m_it1->next(); + + return m_current; +} + +Item ExceptIterator::next() +{ + while(true) + { + if(!m_node1) + { + m_position = -1; + m_current = Item(); + return Item(); + } + else if(!m_node2) + return fromFirstOperand(); + + if(m_node1.asNode().model() != m_node2.asNode().model()) + return fromFirstOperand(); + + switch(m_node1.asNode().compareOrder(m_node2.asNode())) + { + case QXmlNodeModelIndex::Precedes: + return fromFirstOperand(); + case QXmlNodeModelIndex::Follows: + { + m_node2 = m_it2->next(); + if(m_node2) + continue; + else + return fromFirstOperand(); + } + default: + { + m_node1 = m_it1->next(); + m_node2 = m_it2->next(); + } + } + } +} + +Item ExceptIterator::current() const +{ + return m_current; +} + +xsInteger ExceptIterator::position() const +{ + return m_position; +} + +Item::Iterator::Ptr ExceptIterator::copy() const +{ + return Item::Iterator::Ptr(new ExceptIterator(m_it1->copy(), m_it2->copy())); +} + +QT_END_NAMESPACE |