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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qdocumentprojector_p.h"
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QT_BEGIN_NAMESPACE
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using namespace QPatternist;
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DocumentProjector::DocumentProjector(const ProjectedExpression::Vector &paths,
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QAbstractXmlReceiver *const receiver) : m_paths(paths)
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, m_pathCount(paths.count())
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, m_action(ProjectedExpression::Move)
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, m_nodesInProcess(0)
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, m_receiver(receiver)
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{
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Q_ASSERT_X(paths.count() > 0, Q_FUNC_INFO,
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"Using DocumentProjector with no paths is an "
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"overhead and has also undefined behavior.");
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Q_ASSERT(m_receiver);
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}
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void DocumentProjector::startElement(const QXmlName name)
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{
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Q_UNUSED(name);
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switch(m_action)
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{
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case ProjectedExpression::KeepSubtree:
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{
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m_receiver->startElement(name);
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/* Fallthrough. */
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}
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case ProjectedExpression::Skip:
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{
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++m_nodesInProcess;
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return;
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}
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default:
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{
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Q_ASSERT_X(m_action == ProjectedExpression::Move, Q_FUNC_INFO,
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"We're not supposed to receive Keep here, because "
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"endElement() should always end that state.");
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for(int i = 0; i < m_pathCount; ++i)
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{
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m_action = m_paths.at(i)->actionForElement(name, m_paths[i]);
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switch(m_action)
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{
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case ProjectedExpression::Keep:
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{
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m_action = ProjectedExpression::Keep;
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continue;
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}
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case ProjectedExpression::KeepSubtree:
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{
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/* Ok, at least one path wanted this node. Pass it on,
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* and exit. */
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m_receiver->startElement(name);
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++m_nodesInProcess;
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return;
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}
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case ProjectedExpression::Skip:
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{
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/* This particular path doesn't need it, but
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* some other path might, so continue looping. */
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continue;
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}
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case ProjectedExpression::Move:
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Q_ASSERT_X(false, Q_FUNC_INFO, "The action functions can never return Move.");
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}
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}
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++m_nodesInProcess;
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if(m_action == ProjectedExpression::Keep)
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m_receiver->startElement(name);
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else
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{
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Q_ASSERT(m_action == ProjectedExpression::Skip);
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}
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}
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}
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}
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void DocumentProjector::endElement()
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{
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if(m_action == ProjectedExpression::Keep)
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{
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Q_ASSERT(m_nodesInProcess == 1);
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m_receiver->endElement();
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/* We have now kept the single node, and now wants to skip
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* all its children. */
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m_action = ProjectedExpression::Skip;
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m_nodesInProcess = 0;
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}
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else if(m_action == ProjectedExpression::KeepSubtree)
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{
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m_receiver->endElement();
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--m_nodesInProcess;
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if(m_nodesInProcess == 0)
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{
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/* We have now skipped all the children, let's do
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* a new path analysis. */
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m_action = ProjectedExpression::Move;
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}
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}
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else
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{
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Q_ASSERT_X(m_action == ProjectedExpression::Skip, Q_FUNC_INFO,
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"We're not supposed to be in a Move action here.");
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/* We skip calling m_receiver's endElement() here since we're
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* skipping. */
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Q_ASSERT(m_nodesInProcess > 0);
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--m_nodesInProcess;
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if(m_nodesInProcess == 0)
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{
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/* Ok, we've skipped them all, let's do something
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* new -- let's Move on to the next path! */
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m_action = ProjectedExpression::Move;
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}
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}
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}
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void DocumentProjector::attribute(const QXmlName name,
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const QString &value)
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{
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Q_UNUSED(name);
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Q_UNUSED(value);
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}
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void DocumentProjector::namespaceBinding(const QXmlName nb)
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{
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Q_UNUSED(nb);
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}
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void DocumentProjector::comment(const QString &value)
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{
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Q_ASSERT_X(!value.contains(QLatin1String("--")), Q_FUNC_INFO,
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"Invalid input; it's the caller's responsibility to ensure the input is correct.");
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Q_UNUSED(value);
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}
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void DocumentProjector::characters(const QString &value)
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{
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Q_UNUSED(value);
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}
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void DocumentProjector::processingInstruction(const QXmlName name,
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const QString &value)
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{
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Q_ASSERT_X(!value.contains(QLatin1String("?>")), Q_FUNC_INFO,
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"Invalid input; it's the caller's responsibility to ensure the input is correct.");
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Q_UNUSED(name);
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Q_UNUSED(value);
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}
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void DocumentProjector::item(const Item &outputItem)
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{
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Q_UNUSED(outputItem);
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}
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void DocumentProjector::startDocument()
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{
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}
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void DocumentProjector::endDocument()
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{
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}
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QT_END_NAMESPACE
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