blob: 6f105727babba489854c2b43a17fe2a9281be125 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@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 <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
|
