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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.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_AxisStep_H
#define Patternist_AxisStep_H
#include "qemptycontainer_p.h"
#include "qitem_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short A step in a path expression that with an axis and a node test evaluates
* to a sequence of nodes from the context item.
*
* @author Frans Englich <fenglich@trolltech.com>
* @ingroup Patternist_expressions
*/
class Q_AUTOTEST_EXPORT AxisStep : public EmptyContainer
{
public:
AxisStep(const QXmlNodeModelIndex::Axis axis,
const ItemType::Ptr &nodeTest);
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
/**
* Returns @p node if it matches the node test this step is using, otherwise @c null.
*/
inline Item mapToItem(const QXmlNodeModelIndex &node,
const DynamicContext::Ptr &context) const;
virtual SequenceType::List expectedOperandTypes() const;
virtual SequenceType::Ptr staticType() const;
/**
* Rewrites to ParentNodeAxis, if possible.
*/
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
/**
* @returns always BuiltinTypes::node;
*/
virtual ItemType::Ptr expectedContextItemType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual Properties properties() const;
/**
* @returns the axis this step is using.
*/
QXmlNodeModelIndex::Axis axis() const;
/**
* @returns the node test this step is using.
*/
inline ItemType::Ptr nodeTest() const
{
return m_nodeTest;
}
void setNodeTest(const ItemType::Ptr &nev)
{
m_nodeTest = nev;
}
/**
* @short Prints the EBNF name corresponding to @p axis.
*
* For instance, for QXmlNodeModelIndex::Child, "child" is returned.
*
* Apart from being used in this class, it is used in the SDK.
*/
static QString axisName(const QXmlNodeModelIndex::Axis axis);
virtual ID id() const;
virtual PatternPriority patternPriority() const;
inline void setAxis(const QXmlNodeModelIndex::Axis newAxis);
private:
typedef QExplicitlySharedDataPointer<const AxisStep> ConstPtr;
static const QXmlNodeModelIndex::NodeKind s_whenAxisNodeKindEmpty[];
/**
* @returns @c true when the axis @p axis and a node test testing node of
* type @p nodeKind always produces an empty sequence. One such example
* is <tt>attribute::comment()</tt>.
*/
static bool isAlwaysEmpty(const QXmlNodeModelIndex::Axis axis,
const QXmlNodeModelIndex::NodeKind nodeKind);
/**
* The reason this variable is mutable, is that in the case of XSL-T patterns,
* we do quite some reordering.
*/
QXmlNodeModelIndex::Axis m_axis;
ItemType::Ptr m_nodeTest;
};
void AxisStep::setAxis(const QXmlNodeModelIndex::Axis newAxis)
{
m_axis = newAxis;
}
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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