| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** |
| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
| ** |
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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 |
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| ****************************************************************************/ |
| |
| #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); |
| Q_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 QStringRef &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 QStringRef &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 |