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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_OptimizationBlocks_H
53 #define Patternist_OptimizationBlocks_H
55 #include <private/qatomiccomparator_p.h>
56 #include <private/qexpression_p.h>
57 #include <private/qoptimizerframework_p.h>
66 * @short Contains a set of common OptimizerPass instances.
68 * @author Frans englich <frans.englich@nokia.com>
69 * @ingroup Patternist_expressions
71 namespace OptimizationPasses
74 * A list of OptimizerPass instances that performs the
77 * - <tt>count([expr]) ne 0</tt> into <tt>exists([expr])</tt>
78 * - <tt>count([expr]) != 0</tt> into <tt>exists([expr])</tt>
79 * - <tt>0 ne count([expr])</tt> into <tt>exists([expr])</tt>
80 * - <tt>0 != count([expr])</tt> into <tt>exists([expr])</tt>
81 * - <tt>count([expr]) eq 0</tt> into <tt>empty([expr])</tt>
82 * - <tt>count([expr]) = 0</tt> into <tt>empty([expr])</tt>
83 * - <tt>0 eq count([expr])</tt> into <tt>empty([expr])</tt>
84 * - <tt>0 = count([expr])</tt> into <tt>empty([expr])</tt>
85 * - <tt>count([expr]) ge 1</tt> into <tt>exists([expr])</tt>
86 * - <tt>count([expr]) >= 1</tt> into <tt>exists([expr])</tt>
88 extern OptimizationPass::List comparisonPasses;
91 * A list of OptimizerPass instances that performs the
94 * - <tt>for $var in [expr] return $var</tt> into <tt>[expr]</tt>
96 extern OptimizationPass::List forPasses;
99 * A list of OptimizerPass instances that performs the
100 * following rewrites:
102 * - <tt>if([expr of type xs:boolean]) then true() else false()</tt>
103 * into <tt>[expr of type xs:boolean]</tt>
105 extern OptimizationPass::List ifThenPasses;
108 * A list of OptimizerPass instances that performs the
109 * following rewrites:
111 * - <tt>fn:not(fn:exists([expr]))</tt> into <tt>fn:empty([expr])</tt>
112 * - <tt>fn:not(fn:empty([expr]))</tt> into <tt>fn:exists([expr])</tt>
114 extern OptimizationPass::List notFN;
117 * Initializes the data members in the OptimizationPasses namespace.
119 * This class is not supposed to be instantiated, but to be used via its init()
120 * function. In fact, this class cannot be instantiated.
122 * @author Frans englich <frans.englich@nokia.com>
128 * Initializes the members in the OptimizationPasses namespace.
133 Q_DISABLE_COPY(Coordinator)
134 inline Coordinator();