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Diffstat (limited to 'src/xmlpatterns/expr/qoptimizationpasses_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qoptimizationpasses_p.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qoptimizationpasses_p.h b/src/xmlpatterns/expr/qoptimizationpasses_p.h new file mode 100644 index 0000000..178ca27 --- /dev/null +++ b/src/xmlpatterns/expr/qoptimizationpasses_p.h @@ -0,0 +1,143 @@ +/**************************************************************************** +** +** 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_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 <fenglich@trolltech.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 <fenglich@trolltech.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 |