summaryrefslogtreecommitdiff
path: root/src/xmlpatterns/janitors/qcardinalityverifier_p.h
blob: d0838785bff4ff66e0a960325d43ef125174d5ba (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
/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_CardinalityVerifier_H
#define Patternist_CardinalityVerifier_H

#include <private/qsinglecontainer_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Verifies that the sequence an Expression evaluates to conforms to a Cardinality.
     *
     * @see <a href="http://www.w3.org/TR/xpath-functions/#cardinality-funcs">XQuery 1.0 and
     * XPath 2.0 Functions and Operators, 15.2 Functions That Test the Cardinality of Sequences</a>
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class CardinalityVerifier : public SingleContainer
    {
    public:
        CardinalityVerifier(const Expression::Ptr &operand,
                            const Cardinality &card,
                            const ReportContext::ErrorCode code);

        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
        virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;

        virtual SequenceType::List expectedOperandTypes() const;
        virtual SequenceType::Ptr staticType() const;

        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;

        /**
         * If the static cardinality of the operand is within the required cardinality,
         * the operand is returned as is, since results will always be valid and hence
         * is not a CardinalityVerifier necessary.
         */
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);

        /**
         * A utility function for determining whether the static type of an Expression matches
         * a cardinality. More specifically, this function performs the cardinality verification
         * part of the Function Conversion Rules.
         *
         * @todo Mention the rewrite and when exactly an error is issued via @p context
         */
        static Expression::Ptr
        verifyCardinality(const Expression::Ptr &operand,
                          const Cardinality &card,
                          const StaticContext::Ptr &context,
                          const ReportContext::ErrorCode code = ReportContext::XPTY0004);

        virtual const SourceLocationReflection *actualReflection() const;

        ID id() const;
    private:
        /**
         * Centralizes a message string in order to increase consistency and
         * reduce work for translators.
         */
        static inline QString wrongCardinality(const Cardinality &req,
                                               const Cardinality &got = Cardinality::empty());

        const Cardinality m_reqCard;
        const bool m_allowsMany;
        const ReportContext::ErrorCode m_errorCode;
    };
}

QT_END_NAMESPACE

#endif