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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 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 http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qboolean_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qorexpression_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
OrExpression::OrExpression(const Expression::Ptr &operand1,
const Expression::Ptr &operand2) : AndExpression(operand1, operand2)
{
}
bool OrExpression::evaluateEBV(const DynamicContext::Ptr &context) const
{
return m_operand1->evaluateEBV(context) || m_operand2->evaluateEBV(context);
}
Expression::Ptr OrExpression::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::BooleanTrue, context, this);
else if(m_operand2->isEvaluated() && m_operand2->evaluateEBV(context->dynamicContext()))
return wrapLiteral(CommonValues::BooleanTrue, context, this);
else
return Expression::Ptr(this);
}
ExpressionVisitorResult::Ptr OrExpression::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QT_END_NAMESPACE
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