blob: 8e6e5ce44e51ab087c48dd27fdcb793070c24c73 (
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
|
/****************************************************************************
**
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qboolean_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qinstanceof_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
InstanceOf::InstanceOf(const Expression::Ptr &operand,
const SequenceType::Ptr &tType) : SingleContainer(operand)
, m_targetType(tType)
{
Q_ASSERT(m_targetType);
}
bool InstanceOf::evaluateEBV(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
Item item(it->next());
unsigned int count = 1;
if(!item)
return m_targetType->cardinality().allowsEmpty();
do
{
if(!m_targetType->itemType()->itemMatches(item))
return false;
if(count == 2 && !m_targetType->cardinality().allowsMany())
return false;
item = it->next();
++count;
} while(item);
return true;
}
Expression::Ptr InstanceOf::compress(const StaticContext::Ptr &context)
{
const Expression::Ptr me(SingleContainer::compress(context));
if(me != this || m_operand->has(DisableTypingDeduction))
return me;
const SequenceType::Ptr opType(m_operand->staticType());
const ItemType::Ptr targetType(m_targetType->itemType());
const ItemType::Ptr operandType(opType->itemType());
if(m_targetType->cardinality().isMatch(opType->cardinality()))
{
if(*operandType == *CommonSequenceTypes::Empty || targetType->xdtTypeMatches(operandType))
return wrapLiteral(CommonValues::BooleanTrue, context, this);
else if(!operandType->xdtTypeMatches(targetType))
return wrapLiteral(CommonValues::BooleanFalse, context, this);
}
/* Optimization: rule out the case where instance of will always fail. */
return me;
}
SequenceType::Ptr InstanceOf::targetType() const
{
return m_targetType;
}
SequenceType::Ptr InstanceOf::staticType() const
{
return CommonSequenceTypes::ExactlyOneBoolean;
}
SequenceType::List InstanceOf::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
ExpressionVisitorResult::Ptr InstanceOf::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QT_END_NAMESPACE
|
