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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/****************************************************************************
**
** Copyright (C) 2010 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_AtomicComparator_H
#define Patternist_AtomicComparator_H
#include <QFlags>
#include "qitem_p.h"
#include "qatomictypedispatch_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
class QString;
namespace QPatternist
{
/**
* @short Base class for classes responsible of comparing two atomic values.
*
* This class is also known as the AtomicParrot.
*
* @ingroup Patternist_xdm
* @author Frans Englich <frans.englich@nokia.com>
*/
class Q_AUTOTEST_EXPORT AtomicComparator : public AtomicTypeVisitorResult
{
public:
AtomicComparator();
virtual ~AtomicComparator();
typedef QExplicitlySharedDataPointer<AtomicComparator> Ptr;
/**
* Identifies operators used in value comparisons.
*
* The enum values are bit-significant.
*
* @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">W3C XML Path
* Language (XPath) 2.0, 3.5.1 Value Comparisons</a>
*/
enum Operator
{
/**
* Operator <tt>eq</tt> and <tt>=</tt>.
*/
OperatorEqual = 1,
/**
* Operator <tt>ne</tt> and <tt>!=</tt>.
*/
OperatorNotEqual = 1 << 1,
/**
* Operator <tt>gt</tt> and <tt>\></tt>.
*/
OperatorGreaterThan = 1 << 2,
/**
* Operator <tt>lt</tt> and <tt>\<</tt>.
*/
OperatorLessThan = 1 << 3,
/**
* One of the operators we use for sorting. The only difference from
* OperatorLessThan is that it sees NaN as ordered and smaller than
* other numbers.
*/
OperatorLessThanNaNLeast = 1 << 4,
/**
* One of the operators we use for sorting. The only difference from
* OperatorLessThanLeast is that it sees NaN as ordered and larger than
* other numbers.
*/
OperatorLessThanNaNGreatest = 1 << 5,
/**
* Operator <tt>ge</tt> and <tt>\>=</tt>.
*/
OperatorGreaterOrEqual = OperatorEqual | OperatorGreaterThan,
/**
* Operator <tt>le</tt> and <tt>\<=</tt>.
*/
OperatorLessOrEqual = OperatorEqual | OperatorLessThan
};
typedef QFlags<Operator> Operators;
/**
* Signifies the result of a value comparison. This is used for value comparisons,
* and in the future likely also for sorting.
*
* @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">W3C XML Path
* Language (XPath) 2.0, 3.5.1 Value Comparisons</a>
*/
enum ComparisonResult
{
LessThan = 1,
Equal = 2,
GreaterThan = 4,
Incomparable = 8
};
/**
* Compares @p op1 and @p op2 and determines the relationship between the two. This
* is used for sorting and comparisons. The implementation performs an assert crash,
* and must therefore be re-implemented if comparing the relevant values should be
* possible.
*
* @param op1 the first operand
* @param op the operator. How a comparison is carried out shouldn't depend on what the
* operator is, but in some cases it is of interest.
* @param op2 the second operand
*/
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
/**
* Determines whether @p op1 and @p op2 are equal. It is the same as calling compare()
* and checking whether the return value is Equal, but since comparison testing is such
* a common operation, this specialized function exists.
*
* @returns true if @p op1 and @p op2 are equal.
*
* @param op1 the first operand
* @param op2 the second operand
*/
virtual bool equals(const Item &op1,
const Item &op2) const = 0;
/**
* Identifies the kind of comparison.
*/
enum ComparisonType
{
/**
* Identifies a general comparison; operator @c =, @c >, @c <=, and so on.
*/
AsGeneralComparison = 1,
/**
* Identifies a value comparison; operator @c eq, @c lt, @c le, and so on.
*/
AsValueComparison
};
/**
* Utility function for getting the lexical representation for
* the comparison operator @p op. Depending on the @p type argument,
* the string returned is either a general comparison or a value comparison
* operator.
*
* @param op the operator which the display name should be determined for.
* @param type signifies whether the returned display name should be for
* a value comparison or a general comparison. For example, if @p op is
* OperatorEqual and @p type is AsValueComparision, "eq" is returned.
*/
static QString displayName(const AtomicComparator::Operator op,
const ComparisonType type);
};
Q_DECLARE_OPERATORS_FOR_FLAGS(AtomicComparator::Operators)
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
