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
|
/****************************************************************************
**
** 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_ValueComparison_H
#define Patternist_ValueComparison_H
#include "qatomiccomparator_p.h"
#include "qpaircontainer_p.h"
#include "qcomparisonplatform_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements XPath 2.0 value comparions, such as the <tt>eq</tt> operator.
*
* ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform
* must access members of ValueComparison.
*
* @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">XML Path Language
* (XPath) 2.0, 3.5.1 Value Comparisons</a>
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class ValueComparison : public PairContainer,
public ComparisonPlatform<ValueComparison, true>
{
public:
ValueComparison(const Expression::Ptr &op1,
const AtomicComparator::Operator op,
const Expression::Ptr &op2);
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
/**
* @returns always CommonSequenceTypes::ExactlyOneBoolean
*/
virtual SequenceType::Ptr staticType() const;
virtual SequenceType::List expectedOperandTypes() const;
/**
* @returns IDValueComparison
*/
virtual ID id() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
/**
* Overridden to optimize case-insensitive compares.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
/**
* @returns the operator that this ValueComparison is using.
*/
inline AtomicComparator::Operator operatorID() const
{
return m_operator;
}
/**
* It is considered that the string value from @p op1 will be compared against @p op2. This
* function determines whether the user intends the comparison to be case insensitive. If
* that is the case @c true is returned, and the operands are re-written appropriately.
*
* This is a helper function for Expression classes that compares strings.
*
* @see ComparisonPlatform::useCaseInsensitiveComparator()
*/
static bool isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2);
private:
const AtomicComparator::Operator m_operator;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
