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Diffstat (limited to 'src/xmlpatterns/expr/qcopyof.cpp')
| -rw-r--r-- | src/xmlpatterns/expr/qcopyof.cpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qcopyof.cpp b/src/xmlpatterns/expr/qcopyof.cpp new file mode 100644 index 0000000..448ce5e --- /dev/null +++ b/src/xmlpatterns/expr/qcopyof.cpp @@ -0,0 +1,134 @@ +/**************************************************************************** +** +** 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 "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 |