summaryrefslogtreecommitdiff
path: root/src/xmlpatterns/functions/qdeepequalfn.cpp
blob: 1a8a3cc2af61732332a86f74c39a68cdee4eea6a (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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qliteral_p.h"
#include "qschemanumeric_p.h"

#include "qdeepequalfn_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

bool DeepEqualFN::evaluateEBV(const DynamicContext::Ptr &context) const
{
    const Item::Iterator::Ptr it1(m_operands.first()->evaluateSequence(context));
    const Item::Iterator::Ptr it2(m_operands.at(1)->evaluateSequence(context));

    while(true)
    {
        const Item item1(it1->next());
        const Item item2(it2->next());

        if(!item1)
        {
            if(item2)
                return false;
            else
                return true;
        }
        else if(!item2)
        {
            if(item1)
                return false;
            else
                return true;
        }
        else if(item1.isNode())
        {
            if(item2.isNode())
            {
                if(item1.asNode().isDeepEqual(item2.asNode()))
                    continue;
                else
                    return false;
            }
            else
                return false;
        }
        else if(item2.isNode())
        {
            /* We know that item1 is not a node due to the check above. */
            return false;
        }
        else if(flexibleCompare(item1, item2, context))
            continue;
        else if(BuiltinTypes::numeric->itemMatches(item1) &&
                item1.as<Numeric>()->isNaN() &&
                item2.as<Numeric>()->isNaN())
        {
            // TODO
            /* Handle the specific NaN circumstances. item2 isn't checked whether it's of
             * type numeric, since the AtomicComparator lookup would have failed if both weren't
             * numeric. */
            continue;
        }
        else
            return false;
    };
}

Expression::Ptr DeepEqualFN::typeCheck(const StaticContext::Ptr &context,
                                       const SequenceType::Ptr &reqType)
{
    const Expression::Ptr me(FunctionCall::typeCheck(context, reqType));
    const ItemType::Ptr t1(m_operands.first()->staticType()->itemType());
    const ItemType::Ptr t2(m_operands.at(1)->staticType()->itemType());
    /* TODO This can be much more improved, and the optimizations should be moved
     * to compress(). */

    if(*CommonSequenceTypes::Empty == *t1)
    {
        if(*CommonSequenceTypes::Empty == *t2)
            return wrapLiteral(CommonValues::BooleanTrue, context, this);
        else
            return me;
    }
    else if(*CommonSequenceTypes::Empty == *t2)
    {
        if(*CommonSequenceTypes::Empty == *t1)
            return wrapLiteral(CommonValues::BooleanTrue, context, this);
        else
            return me;
    }
    else if(BuiltinTypes::node->xdtTypeMatches(t1) &&
            BuiltinTypes::node->xdtTypeMatches(t2))
        return me; /* We're comparing nodes. */
    else if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t1) &&
            BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t2))
    {
        prepareComparison(fetchComparator(t1, t2, context));
        return me;
    }
    else
    {
        if ((BuiltinTypes::node->xdtTypeMatches(t1) && BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t2))
            || (BuiltinTypes::node->xdtTypeMatches(t2) && BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t1)))
        {
            /* One operand contains nodes and the other atomic values, or vice versa. They can never
             * be identical. */
        // TODO warn?
            return wrapLiteral(CommonValues::BooleanFalse, context, this);
        }
        else
        {
            // TODO Warn?
            return me;
        }
    }
}

QT_END_NAMESPACE