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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcommonvalues_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequencetype_p.h"
#include "qemptysequence_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
Expression::Ptr EmptySequence::create(const Expression *const replacementFor,
const StaticContext::Ptr &context)
{
Q_ASSERT(replacementFor);
Q_ASSERT(context);
const Expression::Ptr retval(new EmptySequence());
context->wrapExpressionWith(replacementFor, retval);
return retval;
}
Item::Iterator::Ptr EmptySequence::evaluateSequence(const DynamicContext::Ptr &) const
{
return CommonValues::emptyIterator;
}
Item EmptySequence::evaluateSingleton(const DynamicContext::Ptr &) const
{
return Item();
}
void EmptySequence::evaluateToSequenceReceiver(const DynamicContext::Ptr &) const
{
}
ItemType::Ptr EmptySequence::type() const
{
return CommonSequenceTypes::Empty;
}
SequenceType::Ptr EmptySequence::staticType() const
{
return CommonSequenceTypes::Empty;
}
bool EmptySequence::evaluateEBV(const DynamicContext::Ptr &) const
{
return false;
}
QString EmptySequence::stringValue() const
{
return QString();
}
ExpressionVisitorResult::Ptr EmptySequence::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::ID EmptySequence::id() const
{
return IDEmptySequence;
}
Expression::Properties EmptySequence::properties() const
{
return IsEvaluated;
}
QT_END_NAMESPACE
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