/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#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