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/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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 <private/qemptycontainer_p.h>
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 <frans.englich@nokia.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
#endif
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