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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| |
| // |
| // 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 <private/qatomiccomparator_p.h> |
| #include <private/qexpression_p.h> |
| #include <private/qoptimizerframework_p.h> |
| |
| 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 |
| |
| #endif |