--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/projection/qdocumentprojector.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,214 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@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