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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://qt.nokia.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_OptimizationBlocks_H
#define Patternist_OptimizationBlocks_H
#include "qatomiccomparator_p.h"
#include "qexpression_p.h"
#include "qoptimizerframework_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Contains a set of common OptimizerPass instances.
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
namespace OptimizationPasses
{
/**
* A list of OptimizerPass instances that performs the
* following rewrites:
*
* - <tt>count([expr]) ne 0</tt> into <tt>exists([expr])</tt>
* - <tt>count([expr]) != 0</tt> into <tt>exists([expr])</tt>
* - <tt>0 ne count([expr])</tt> into <tt>exists([expr])</tt>
* - <tt>0 != count([expr])</tt> into <tt>exists([expr])</tt>
* - <tt>count([expr]) eq 0</tt> into <tt>empty([expr])</tt>
* - <tt>count([expr]) = 0</tt> into <tt>empty([expr])</tt>
* - <tt>0 eq count([expr])</tt> into <tt>empty([expr])</tt>
* - <tt>0 = count([expr])</tt> into <tt>empty([expr])</tt>
* - <tt>count([expr]) ge 1</tt> into <tt>exists([expr])</tt>
* - <tt>count([expr]) >= 1</tt> into <tt>exists([expr])</tt>
*/
extern OptimizationPass::List comparisonPasses;
/**
* A list of OptimizerPass instances that performs the
* following rewrites:
*
* - <tt>for $var in [expr] return $var</tt> into <tt>[expr]</tt>
*/
extern OptimizationPass::List forPasses;
/**
* A list of OptimizerPass instances that performs the
* following rewrites:
*
* - <tt>if([expr of type xs:boolean]) then true() else false()</tt>
* into <tt>[expr of type xs:boolean]</tt>
*/
extern OptimizationPass::List ifThenPasses;
/**
* A list of OptimizerPass instances that performs the
* following rewrites:
*
* - <tt>fn:not(fn:exists([expr]))</tt> into <tt>fn:empty([expr])</tt>
* - <tt>fn:not(fn:empty([expr]))</tt> into <tt>fn:exists([expr])</tt>
*/
extern OptimizationPass::List notFN;
/**
* Initializes the data members in the OptimizationPasses namespace.
*
* This class is not supposed to be instantiated, but to be used via its init()
* function. In fact, this class cannot be instantiated.
*
* @author Frans englich <frans.englich@nokia.com>
*/
class Coordinator
{
public:
/**
* Initializes the members in the OptimizationPasses namespace.
*/
static void init();
private:
Q_DISABLE_COPY(Coordinator)
inline Coordinator();
};
}
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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