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
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qabstractfloat_p.h"
#include "qboolean_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qfirstitempredicate_p.h"
#include "qgenericsequencetype_p.h"
#include "qitemmappingiterator_p.h"
#include "qliteral_p.h"
#include "qpatternistlocale_p.h"
#include "qtruthpredicate_p.h"
#include "qgenericpredicate_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
GenericPredicate::GenericPredicate(const Expression::Ptr &sourceExpression,
const Expression::Ptr &predicate) : PairContainer(sourceExpression,
predicate)
{
}
Expression::Ptr GenericPredicate::create(const Expression::Ptr &sourceExpression,
const Expression::Ptr &predicateExpression,
const StaticContext::Ptr &context,
const QSourceLocation &location)
{
Q_ASSERT(sourceExpression);
Q_ASSERT(predicateExpression);
Q_ASSERT(context);
const ItemType::Ptr type(predicateExpression->staticType()->itemType());
if(predicateExpression->is(IDIntegerValue) &&
predicateExpression->as<Literal>()->item().as<Numeric>()->toInteger() == 1)
{ /* Handle [1] */
return createFirstItem(sourceExpression);
}
else if(BuiltinTypes::numeric->xdtTypeMatches(type))
{ /* A numeric predicate, other than [1]. */
/* TODO at somepoint we'll return a specialized expr here, NumericPredicate or so.
* Dependency analysis is a bit tricky, since the contained expression can depend on
* some loop component. */
return Expression::Ptr(new GenericPredicate(sourceExpression, predicateExpression));
}
else if(*CommonSequenceTypes::Empty == *type)
{
return EmptySequence::create(predicateExpression.data(), context);
}
else if(*BuiltinTypes::item == *type ||
*BuiltinTypes::xsAnyAtomicType == *type)
{
/* The type couldn't be narrowed at compile time, so we use
* a generic predicate. This check is before the CommonSequenceTypes::EBV check,
* because the latter matches these types as well. */
return Expression::Ptr(new GenericPredicate(sourceExpression, predicateExpression));
}
else if(CommonSequenceTypes::EBV->itemType()->xdtTypeMatches(type))
{
return Expression::Ptr(new TruthPredicate(sourceExpression, predicateExpression));
}
else
{
context->error(QtXmlPatterns::tr("A value of type %1 cannot be a "
"predicate. A predicate must have "
"either a numeric type or an "
"Effective Boolean Value type.")
.arg(formatType(context->namePool(),
sourceExpression->staticType())),
ReportContext::FORG0006, location);
return Expression::Ptr(); /* Silence compiler warning. */
}
}
Expression::Ptr GenericPredicate::createFirstItem(const Expression::Ptr &sourceExpression)
{
return Expression::Ptr(new FirstItemPredicate(sourceExpression));
}
Item GenericPredicate::mapToItem(const Item &item,
const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr it(m_operand2->evaluateSequence(context));
const Item pcateItem(it->next());
if(!pcateItem)
return Item(); /* The predicate evaluated to the empty sequence */
else if(pcateItem.isNode())
return item;
/* Ok, now it must be an AtomicValue */
else if(BuiltinTypes::numeric->xdtTypeMatches(pcateItem.type()))
{ /* It's a positional predicate. */
if(it->next())
{
context->error(QtXmlPatterns::tr("A positional predicate must "
"evaluate to a single numeric "
"value."),
ReportContext::FORG0006, this);
return Item();
}
if(Double::isEqual(static_cast<xsDouble>(context->contextPosition()),
pcateItem.as<Numeric>()->toDouble()))
{
return item;
}
else
return Item();
}
else if(Boolean::evaluateEBV(pcateItem, it, context)) /* It's a truth predicate. */
return item;
else
return Item();
}
Item::Iterator::Ptr GenericPredicate::evaluateSequence(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr newContext(context->createFocus());
newContext->setFocusIterator(focus);
return makeItemMappingIterator<Item>(ConstPtr(this),
focus,
newContext);
}
Item GenericPredicate::evaluateSingleton(const DynamicContext::Ptr &context) const
{
const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context));
const DynamicContext::Ptr newContext(context->createFocus());
newContext->setFocusIterator(focus);
return mapToItem(focus->next(), newContext);
}
SequenceType::List GenericPredicate::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
SequenceType::Ptr GenericPredicate::staticType() const
{
const SequenceType::Ptr type(m_operand1->staticType());
return makeGenericSequenceType(type->itemType(),
type->cardinality() | Cardinality::zeroOrOne());
}
ExpressionVisitorResult::Ptr GenericPredicate::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
ItemType::Ptr GenericPredicate::newFocusType() const
{
return m_operand1->staticType()->itemType();
}
Expression::Properties GenericPredicate::properties() const
{
return CreatesFocusForLast;
}
QString GenericPredicate::description() const
{
return QLatin1String("predicate");
}
Expression::ID GenericPredicate::id() const
{
return IDGenericPredicate;
}
QT_END_NAMESPACE
|
