1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtXmlPatterns module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qcommonvalues_p.h"
41#include "qcommonsequencetypes_p.h"
42#include "qemptysequencetype_p.h"
43
44#include "qemptysequence_p.h"
45
46QT_BEGIN_NAMESPACE
47
48using namespace QPatternist;
49
50Expression::Ptr EmptySequence::create(const Expression *const replacementFor,
51 const StaticContext::Ptr &context)
52{
53 Q_ASSERT(replacementFor);
54 Q_ASSERT(context);
55
56 const Expression::Ptr retval(new EmptySequence());
57 context->wrapExpressionWith(existingNode: replacementFor, newNode: retval);
58 return retval;
59}
60
61Item::Iterator::Ptr EmptySequence::evaluateSequence(const DynamicContext::Ptr &) const
62{
63 return CommonValues::emptyIterator;
64}
65
66Item EmptySequence::evaluateSingleton(const DynamicContext::Ptr &) const
67{
68 return Item();
69}
70
71void EmptySequence::evaluateToSequenceReceiver(const DynamicContext::Ptr &) const
72{
73}
74
75ItemType::Ptr EmptySequence::type() const
76{
77 return CommonSequenceTypes::Empty;
78}
79
80SequenceType::Ptr EmptySequence::staticType() const
81{
82 return CommonSequenceTypes::Empty;
83}
84
85bool EmptySequence::evaluateEBV(const DynamicContext::Ptr &) const
86{
87 return false;
88}
89
90QString EmptySequence::stringValue() const
91{
92 return QString();
93}
94
95ExpressionVisitorResult::Ptr EmptySequence::accept(const ExpressionVisitor::Ptr &visitor) const
96{
97 return visitor->visit(this);
98}
99
100Expression::ID EmptySequence::id() const
101{
102 return IDEmptySequence;
103}
104
105Expression::Properties EmptySequence::properties() const
106{
107 return IsEvaluated;
108}
109
110QT_END_NAMESPACE
111

source code of qtxmlpatterns/src/xmlpatterns/expr/qemptysequence.cpp