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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qitemmappingiterator_p.h"
#include "qcopyof_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
CopyOf::CopyOf(const Expression::Ptr &operand,
const bool inheritNSS,
const bool preserveNSS) : SingleContainer(operand)
, m_inheritNamespaces(inheritNSS)
, m_preserveNamespaces(preserveNSS)
, m_settings((m_inheritNamespaces ? QAbstractXmlNodeModel::InheritNamespaces : QAbstractXmlNodeModel::NodeCopySettings()) |
(m_preserveNamespaces ? QAbstractXmlNodeModel::PreserveNamespaces : QAbstractXmlNodeModel::NodeCopySettings()))
{
}
Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)
{
/* We have zero effect if we have these settings. */
if(m_inheritNamespaces && m_preserveNamespaces)
return m_operand->compress(context);
else
{
const ItemType::Ptr t(m_operand->staticType()->itemType());
/* We have no effect on the empty sequence or atomic values. */
if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t)
|| *t == *CommonSequenceTypes::Empty)
return m_operand->compress(context);
else
return SingleContainer::compress(context);
}
}
void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
/* Optimization: this completely breaks streaming. We get a call to
* evaluateToSequenceReceiver() but we require heap allocations by calling
* evaluateSequence(). */
const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
QAbstractXmlReceiver *const receiver = context->outputReceiver();
Item next(it->next());
while(next)
{
if(next.isNode())
{
const QXmlNodeModelIndex &asNode = next.asNode();
asNode.model()->copyNodeTo(asNode, receiver, m_settings);
}
else
receiver->item(next);
next = it->next();
}
}
ExpressionVisitorResult::Ptr CopyOf::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
SequenceType::Ptr CopyOf::staticType() const
{
return m_operand->staticType();
}
SequenceType::List CopyOf::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
Expression::Properties CopyOf::properties() const
{
/* We have the content of node constructors as children, but even though
* createCopyOf() typically avoids creating us, we can still end up with an operand
* that allows compression. We must always avoid that, because we don't have
* implementation of evaluateSequence(), and so on. */
return (m_operand->properties() & ~CreatesFocusForLast) | DisableElimination;
}
ItemType::Ptr CopyOf::expectedContextItemType() const
{
return m_operand->expectedContextItemType();
}
QT_END_NAMESPACE
|
