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/****************************************************************************
**
** 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 "qboolean_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qandexpression_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
AndExpression::AndExpression(const Expression::Ptr &operand1,
const Expression::Ptr &operand2) : PairContainer(operand1, operand2)
{
}
bool AndExpression::evaluateEBV(const DynamicContext::Ptr &context) const
{
return m_operand1->evaluateEBV(context) && m_operand2->evaluateEBV(context);
}
Expression::Ptr AndExpression::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr newMe(PairContainer::compress(context));
if(newMe != this)
return newMe;
/* Both operands mustn't be evaluated in order to be able to compress. */
if(m_operand1->isEvaluated() && !m_operand1->evaluateEBV(context->dynamicContext()))
return wrapLiteral(CommonValues::BooleanFalse, context, this);
else if(m_operand2->isEvaluated() && !m_operand2->evaluateEBV(context->dynamicContext()))
return wrapLiteral(CommonValues::BooleanFalse, context, this);
else
return Expression::Ptr(this);
}
SequenceType::List AndExpression::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::EBV);
result.append(CommonSequenceTypes::EBV);
return result;
}
SequenceType::Ptr AndExpression::staticType() const
{
return CommonSequenceTypes::ExactlyOneBoolean;
}
ExpressionVisitorResult::Ptr AndExpression::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QT_END_NAMESPACE
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