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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 "qboolean_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qinstanceof_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
InstanceOf::InstanceOf(const Expression::Ptr &operand,
const SequenceType::Ptr &tType) : SingleContainer(operand)
, m_targetType(tType)
{
Q_ASSERT(m_targetType);
}
bool InstanceOf::evaluateEBV(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
Item item(it->next());
unsigned int count = 1;
if(!item)
return m_targetType->cardinality().allowsEmpty();
do
{
if(!m_targetType->itemType()->itemMatches(item))
return false;
if(count == 2 && !m_targetType->cardinality().allowsMany())
return false;
item = it->next();
++count;
} while(item);
return true;
}
Expression::Ptr InstanceOf::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr me(SingleContainer::compress(context));
if(me != this || m_operand->has(DisableTypingDeduction))
return me;
const SequenceType::Ptr opType(m_operand->staticType());
const ItemType::Ptr targetType(m_targetType->itemType());
const ItemType::Ptr operandType(opType->itemType());
if(m_targetType->cardinality().isMatch(opType->cardinality()))
{
if(*operandType == *CommonSequenceTypes::Empty || targetType->xdtTypeMatches(operandType))
return wrapLiteral(CommonValues::BooleanTrue, context, this);
else if(!operandType->xdtTypeMatches(targetType))
return wrapLiteral(CommonValues::BooleanFalse, context, this);
}
/* Optimization: rule out the case where instance of will always fail. */
return me;
}
SequenceType::Ptr InstanceOf::targetType() const
{
return m_targetType;
}
SequenceType::Ptr InstanceOf::staticType() const
{
return CommonSequenceTypes::ExactlyOneBoolean;
}
SequenceType::List InstanceOf::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
ExpressionVisitorResult::Ptr InstanceOf::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QT_END_NAMESPACE
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