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 "qbuiltintypes_p.h"
41#include "qcommonsequencetypes_p.h"
42#include "qgenericsequencetype_p.h"
43
44#include "qcontextitem_p.h"
45
46QT_BEGIN_NAMESPACE
47
48using namespace QPatternist;
49
50Item ContextItem::evaluateSingleton(const DynamicContext::Ptr &context) const
51{
52 return context->contextItem();
53}
54
55Expression::Ptr ContextItem::compress(const StaticContext::Ptr &context)
56{
57 m_itemType = context->contextItemType();
58 return EmptyContainer::compress(context);
59}
60
61Expression::Ptr ContextItem::typeCheck(const StaticContext::Ptr &context,
62 const SequenceType::Ptr &reqType)
63{
64 m_itemType = context->contextItemType();
65 return EmptyContainer::typeCheck(context, reqType);
66}
67
68SequenceType::Ptr ContextItem::staticType() const
69{
70 /* We test m_itemType here because Patternist View calls staticType() before the typeCheck()
71 * stage. */
72 if(m_itemType)
73 return makeGenericSequenceType(itemType: m_itemType, cardinality: Cardinality::exactlyOne());
74 else
75 return CommonSequenceTypes::ExactlyOneItem;
76}
77
78Expression::Properties ContextItem::properties() const
79{
80 return DisableElimination | RequiresContextItem | EvaluationCacheRedundant;
81}
82
83ExpressionVisitorResult::Ptr ContextItem::accept(const ExpressionVisitor::Ptr &visitor) const
84{
85 return visitor->visit(this);
86}
87
88Expression::ID ContextItem::id() const
89{
90 return IDContextItem;
91}
92
93ItemType::Ptr ContextItem::expectedContextItemType() const
94{
95 return BuiltinTypes::item;
96}
97
98const SourceLocationReflection *ContextItem::actualReflection() const
99{
100 if(m_expr)
101 return m_expr.data();
102 else
103 return this;
104}
105
106void ContextItem::announceFocusType(const ItemType::Ptr &type)
107{
108 Q_ASSERT(type);
109 m_itemType = type;
110}
111
112QT_END_NAMESPACE
113

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