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Diffstat (limited to 'src/xmlpatterns/projection/qdocumentprojector.cpp')
| -rw-r--r-- | src/xmlpatterns/projection/qdocumentprojector.cpp | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/src/xmlpatterns/projection/qdocumentprojector.cpp b/src/xmlpatterns/projection/qdocumentprojector.cpp new file mode 100644 index 0000000000..fd0ef290d3 --- /dev/null +++ b/src/xmlpatterns/projection/qdocumentprojector.cpp @@ -0,0 +1,214 @@ +/**************************************************************************** +** +** 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 "qdocumentprojector_p.h" + +QT_BEGIN_NAMESPACE + +using namespace QPatternist; + +DocumentProjector::DocumentProjector(const ProjectedExpression::Vector &paths, + QAbstractXmlReceiver *const receiver) : m_paths(paths) + , m_pathCount(paths.count()) + , m_action(ProjectedExpression::Move) + , m_nodesInProcess(0) + , m_receiver(receiver) +{ + Q_ASSERT_X(paths.count() > 0, Q_FUNC_INFO, + "Using DocumentProjector with no paths is an " + "overhead and has also undefined behavior."); + Q_ASSERT(m_receiver); +} + +void DocumentProjector::startElement(const QXmlName name) +{ + Q_UNUSED(name); + + switch(m_action) + { + case ProjectedExpression::KeepSubtree: + { + m_receiver->startElement(name); + /* Fallthrough. */ + } + case ProjectedExpression::Skip: + { + ++m_nodesInProcess; + return; + } + default: + { + Q_ASSERT_X(m_action == ProjectedExpression::Move, Q_FUNC_INFO, + "We're not supposed to receive Keep here, because " + "endElement() should always end that state."); + + for(int i = 0; i < m_pathCount; ++i) + { + m_action = m_paths.at(i)->actionForElement(name, m_paths[i]); + + switch(m_action) + { + case ProjectedExpression::Keep: + { + m_action = ProjectedExpression::Keep; + continue; + } + case ProjectedExpression::KeepSubtree: + { + /* Ok, at least one path wanted this node. Pass it on, + * and exit. */ + m_receiver->startElement(name); + ++m_nodesInProcess; + return; + } + case ProjectedExpression::Skip: + { + /* This particular path doesn't need it, but + * some other path might, so continue looping. */ + continue; + } + case ProjectedExpression::Move: + Q_ASSERT_X(false, Q_FUNC_INFO, "The action functions can never return Move."); + } + } + + ++m_nodesInProcess; + + if(m_action == ProjectedExpression::Keep) + m_receiver->startElement(name); + else + { + Q_ASSERT(m_action == ProjectedExpression::Skip); + } + } + } +} + +void DocumentProjector::endElement() +{ + if(m_action == ProjectedExpression::Keep) + { + Q_ASSERT(m_nodesInProcess == 1); + + m_receiver->endElement(); + + /* We have now kept the single node, and now wants to skip + * all its children. */ + m_action = ProjectedExpression::Skip; + m_nodesInProcess = 0; + } + else if(m_action == ProjectedExpression::KeepSubtree) + { + m_receiver->endElement(); + --m_nodesInProcess; + + if(m_nodesInProcess == 0) + { + /* We have now skipped all the children, let's do + * a new path analysis. */ + m_action = ProjectedExpression::Move; + } + } + else + { + Q_ASSERT_X(m_action == ProjectedExpression::Skip, Q_FUNC_INFO, + "We're not supposed to be in a Move action here."); + /* We skip calling m_receiver's endElement() here since we're + * skipping. */ + Q_ASSERT(m_nodesInProcess > 0); + --m_nodesInProcess; + + if(m_nodesInProcess == 0) + { + /* Ok, we've skipped them all, let's do something + * new -- let's Move on to the next path! */ + m_action = ProjectedExpression::Move; + } + } +} + +void DocumentProjector::attribute(const QXmlName name, + const QString &value) +{ + Q_UNUSED(name); + Q_UNUSED(value); +} + +void DocumentProjector::namespaceBinding(const QXmlName nb) +{ + Q_UNUSED(nb); +} + +void DocumentProjector::comment(const QString &value) +{ + Q_ASSERT_X(!value.contains(QLatin1String("--")), Q_FUNC_INFO, + "Invalid input; it's the caller's responsibility to ensure the input is correct."); + Q_UNUSED(value); +} + +void DocumentProjector::characters(const QString &value) +{ + Q_UNUSED(value); +} + +void DocumentProjector::processingInstruction(const QXmlName name, + const QString &value) +{ + Q_ASSERT_X(!value.contains(QLatin1String("?>")), Q_FUNC_INFO, + "Invalid input; it's the caller's responsibility to ensure the input is correct."); + Q_UNUSED(name); + Q_UNUSED(value); +} + +void DocumentProjector::item(const Item &outputItem) +{ + Q_UNUSED(outputItem); +} + +void DocumentProjector::startDocument() +{ +} + +void DocumentProjector::endDocument() +{ +} + +QT_END_NAMESPACE |