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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (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 qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_Literal_H
#define Patternist_Literal_H
#include "qemptycontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Houses an AtomicValue, making it available as an Expression.
*
* This is not only literals that can be created via the XQuery syntax(strings and numbers), but
* all other atomic values, such as <tt>xs:date</tt> or <tt>xs:time</tt>.
*
* @see <a href="http://www.w3.org/TR/xquery/#id-literals">XQuery 1.0: An XML Query Language,
* 3.1.1 Literals</a>
* @author Frans Englich <fenglich@trolltech.com>
* @ingroup Patternist_expressions
*/
class Literal : public EmptyContainer
{
public:
/**
* Creates a Literal that represents @p item.
*
* @param item must be non-null and cannot be a QXmlNodeModelIndex.
*/
Literal(const Item &item);
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual ID id() const;
virtual QString description() const;
/**
* @returns Expression::DisableElimination and Expression::IsEvaluated
*/
virtual Properties properties() const;
/**
* Declaring the return value of this function a const reference, leads
* to crashes in patternistview, for a to me unknown reason.
*/
inline Item item() const
{
return m_item;
}
private:
const Item m_item;
};
/**
* @short Creates a Literal that wraps @p item, and returns it.
*
* This simplifies code. Instead of writing:
*
* @code
* Expression::Ptr(new Literal(item));
* @endcode
*
* One can write:
*
* @code
* wrapLiteral(item);
* @endcode
*
* This function is not declared static, because it breaks the build on
* at least aix-xlc-64.
*
* @relates Literal
*/
inline Expression::Ptr wrapLiteral(const Item &item,
const StaticContext::Ptr &context,
const SourceLocationReflection *const r)
{
Q_ASSERT(item);
const Expression::Ptr retval(new Literal(item));
context->addLocation(retval.data(), context->locationFor(r));
return retval;
}
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
