summaryrefslogtreecommitdiffstats
path: root/src/xmlpatterns/expr/qcurrentitemstore.cpp
blob: 5c5d4990e255f491abf08889486e788c243abde4 (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
130
131
132
133
134
135
136
137
138
139
/****************************************************************************
**
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcurrentitemcontext_p.h"
#include "qstaticcurrentcontext_p.h"

#include "qcurrentitemstore_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

CurrentItemStore::CurrentItemStore(const Expression::Ptr &operand) : SingleContainer(operand)
{
}

DynamicContext::Ptr CurrentItemStore::createContext(const DynamicContext::Ptr &old) const
{
    return DynamicContext::Ptr(new CurrentItemContext(old->contextItem(), old));
}

bool CurrentItemStore::evaluateEBV(const DynamicContext::Ptr &context) const
{
    return m_operand->evaluateEBV(createContext(context));
}

Item::Iterator::Ptr CurrentItemStore::evaluateSequence(const DynamicContext::Ptr &context) const
{
    return m_operand->evaluateSequence(createContext(context));
}

Item CurrentItemStore::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    return m_operand->evaluateSingleton(createContext(context));
}

SequenceType::Ptr CurrentItemStore::staticType() const
{
    return m_operand->staticType();
}

SequenceType::List CurrentItemStore::expectedOperandTypes() const
{
    SequenceType::List result;
    result.append(CommonSequenceTypes::ZeroOrMoreItems);
    return result;
}

StaticContext::Ptr CurrentItemStore::newStaticContext(const StaticContext::Ptr &context)
{
    /* It might be we are generated despite there is no focus. In that case
     * an error will reported in case current() is used, but in any case we cannot
     * crash, so use item() in case we have no focus.
     *
     * Such a case is when we're inside a named template, and it's invoked
     * without focus. */
    const ItemType::Ptr t(context->contextItemType());
    return StaticContext::Ptr(new StaticCurrentContext(t ? t : BuiltinTypes::item, context));
}

Expression::Ptr CurrentItemStore::compress(const StaticContext::Ptr &context)
{
    const Expression::Ptr me(SingleContainer::compress(newStaticContext(context)));

    if(me != this)
        return me;
    else
    {
        /* If fn:current() isn't called, there's no point in us sticking
         * around. */
        if(m_operand->deepProperties().testFlag(RequiresCurrentItem))
            return me;
        else
            return m_operand;
    }
}

Expression::Ptr CurrentItemStore::typeCheck(const StaticContext::Ptr &context,
                                            const SequenceType::Ptr &reqType)
{
    return SingleContainer::typeCheck(newStaticContext(context), reqType);
}

ExpressionVisitorResult::Ptr CurrentItemStore::accept(const ExpressionVisitor::Ptr &visitor) const
{
    return visitor->visit(this);
}

const SourceLocationReflection *CurrentItemStore::actualReflection() const
{
    return m_operand->actualReflection();
}

Expression::Properties CurrentItemStore::properties() const
{
    return m_operand->properties() & (RequiresFocus | IsEvaluated | DisableElimination);
}

QT_END_NAMESPACE