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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_RangeIterator_H
#define Patternist_RangeIterator_H
#include "qitem_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short RangeIterator represents a sequence of integers between a
* start and end value.
*
* The RangeIterator contains the evaluation logic for the range expression, <tt>N to M</tt>,
* and its behavior is therefore consistent with the definition of that XPath expression.
* Hence, the detailed behavior of the RangeIterator can be found in the XPath 2.0
* specification.
*
* @see <a href="http://www.w3.org/TR/xpath20/\#doc-xpath-RangeExpr">XML Path Language
* (XPath) 2.0, 3.3 Sequence Expressions, RangeExpr</a>
* @see RangeExpression
* @author Frans Englich <fenglich@trolltech.com>
* @ingroup Patternist_iterators
* @todo Documentation is missing
*/
class Q_AUTOTEST_EXPORT RangeIterator : public Item::Iterator
{
public:
/**
* RangeIterator can iterate in both directions.
* This enumerator exist for identifying different directions.
*/
enum Direction
{
/**
* Signifies that the QAbstractXmlForwardIterator operates in a reverse direction, where the
* first item returned by the next() function is from the beginning of the
* source sequence.
*/
Backward = 0,
/**
* Signifies the forward direction. Iterators do conceptually operate
* in the forward direction by default.
*/
Forward = 1
};
/**
* Creates an QAbstractXmlForwardIterator that returns integer values from consecutive sequence
* of integers between @p start and @p end, where the step taken
* between each integer is 1 with polarity as specified in @p direction.
*
* @note @p start must be smaller than @p end, not larger
* or equal. This is not checked.
*/
RangeIterator(const xsInteger start,
const Direction direction,
const xsInteger end);
virtual Item next();
virtual Item current() const;
virtual xsInteger position() const;
virtual xsInteger count();
virtual Item::Iterator::Ptr toReversed();
virtual Item::Iterator::Ptr copy() const;
private:
xsInteger m_start;
xsInteger m_end;
Item m_current;
xsInteger m_position;
xsInteger m_count;
const Direction m_direction;
/**
* We only need to store -1 or 1, so save memory with a bit field.
*/
const qint8 m_increment : 2;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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