1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4 ** All rights reserved.
5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
9 ** $QT_BEGIN_LICENSE:LGPL$
10 ** GNU Lesser General Public License Usage
11 ** This file may be used under the terms of the GNU Lesser General Public
12 ** License version 2.1 as published by the Free Software Foundation and
13 ** appearing in the file LICENSE.LGPL included in the packaging of this
14 ** file. Please review the following information to ensure the GNU Lesser
15 ** General Public License version 2.1 requirements will be met:
16 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
18 ** In addition, as a special exception, Nokia gives you certain additional
19 ** rights. These rights are described in the Nokia Qt LGPL Exception
20 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
22 ** GNU General Public License Usage
23 ** Alternatively, this file may be used under the terms of the GNU General
24 ** Public License version 3.0 as published by the Free Software Foundation
25 ** and appearing in the file LICENSE.GPL included in the packaging of this
26 ** file. Please review the following information to ensure the GNU General
27 ** Public License version 3.0 requirements will be met:
28 ** http://www.gnu.org/copyleft/gpl.html.
31 ** Alternatively, this file may be used in accordance with the terms and
32 ** conditions contained in a signed written agreement between you and Nokia.
40 ****************************************************************************/
42 #include "qbuiltintypes_p.h"
43 #include "qcommonsequencetypes_p.h"
44 #include "qitemmappingiterator_p.h"
46 #include "qcopyof_p.h"
50 using namespace QPatternist;
52 CopyOf::CopyOf(const Expression::Ptr &operand,
53 const bool inheritNSS,
54 const bool preserveNSS) : SingleContainer(operand)
55 , m_inheritNamespaces(inheritNSS)
56 , m_preserveNamespaces(preserveNSS)
57 , m_settings((m_inheritNamespaces ? QAbstractXmlNodeModel::InheritNamespaces : QAbstractXmlNodeModel::NodeCopySettings()) |
58 (m_preserveNamespaces ? QAbstractXmlNodeModel::PreserveNamespaces : QAbstractXmlNodeModel::NodeCopySettings()))
62 Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)
64 /* We have zero effect if we have these settings. */
65 if(m_inheritNamespaces && m_preserveNamespaces)
66 return m_operand->compress(context);
69 const ItemType::Ptr t(m_operand->staticType()->itemType());
70 /* We have no effect on the empty sequence or atomic values. */
71 if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t)
72 || *t == *CommonSequenceTypes::Empty)
73 return m_operand->compress(context);
75 return SingleContainer::compress(context);
79 void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
81 /* Optimization: this completely breaks streaming. We get a call to
82 * evaluateToSequenceReceiver() but we require heap allocations by calling
83 * evaluateSequence(). */
85 const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
86 QAbstractXmlReceiver *const receiver = context->outputReceiver();
87 Item next(it->next());
93 const QXmlNodeModelIndex &asNode = next.asNode();
94 asNode.model()->copyNodeTo(asNode, receiver, m_settings);
103 ExpressionVisitorResult::Ptr CopyOf::accept(const ExpressionVisitor::Ptr &visitor) const
105 return visitor->visit(this);
108 SequenceType::Ptr CopyOf::staticType() const
110 return m_operand->staticType();
113 SequenceType::List CopyOf::expectedOperandTypes() const
115 SequenceType::List result;
116 result.append(CommonSequenceTypes::ZeroOrMoreItems);
120 Expression::Properties CopyOf::properties() const
122 /* We have the content of node constructors as children, but even though
123 * createCopyOf() typically avoids creating us, we can still end up with an operand
124 * that allows compression. We must always avoid that, because we don't have
125 * implementation of evaluateSequence(), and so on. */
126 return (m_operand->properties() & ~CreatesFocusForLast) | DisableElimination;
129 ItemType::Ptr CopyOf::expectedContextItemType() const
131 return m_operand->expectedContextItemType();