summaryrefslogtreecommitdiffstats
path: root/src/xmlpatterns/api/qvariableloader.cpp
blob: 9909508b5c15593fbc57bd58f7cb78943c97e30f (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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
/****************************************************************************
**
** Copyright (C) 2011 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 <QVariant>
#include <QStringList>

#include "qanyuri_p.h"
#include "qatomicstring_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qgenericsequencetype_p.h"
#include "qinteger_p.h"
#include "qitem_p.h"
#include "qsequencetype_p.h"
#include "qvariableloader_p.h"
#include "qxmlquery_p.h"

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    class VariantListIterator : public ListIteratorPlatform<QVariant, Item, VariantListIterator>
    {
    public:
        inline VariantListIterator(const QVariantList &list) : ListIteratorPlatform<QVariant, Item, VariantListIterator>(list)
        {
        }

    private:
        friend class ListIteratorPlatform<QVariant, Item, VariantListIterator>;

        inline Item inputToOutputItem(const QVariant &inputType) const
        {
            return AtomicValue::toXDM(inputType);
        }
    };

    class StringListIterator : public ListIteratorPlatform<QString, Item, StringListIterator>
    {
    public:
        inline StringListIterator(const QStringList &list) : ListIteratorPlatform<QString, Item, StringListIterator>(list)
        {
        }

    private:
        friend class ListIteratorPlatform<QString, Item, StringListIterator>;

        static inline Item inputToOutputItem(const QString &inputType)
        {
            return AtomicString::fromValue(inputType);
        }
    };

    /**
     * Takes two DynamicContext instances, and redirects the storage of temporary trees
     * to one of them.
     *
     * @since 4.5
     */
    class TemporaryTreesRedirectingContext : public DelegatingDynamicContext
    {
    public:
        TemporaryTreesRedirectingContext(const DynamicContext::Ptr &other,
                                         const DynamicContext::Ptr &modelStorage) : DelegatingDynamicContext(other)
                                                                                  , m_modelStorage(modelStorage)
        {
            Q_ASSERT(m_modelStorage);
        }

        virtual void addNodeModel(const QAbstractXmlNodeModel::Ptr &nodeModel)
        {
            m_modelStorage->addNodeModel(nodeModel);
        }

    private:
        const DynamicContext::Ptr m_modelStorage;
    };
}

using namespace QPatternist;

SequenceType::Ptr VariableLoader::announceExternalVariable(const QXmlName name,
                                                           const SequenceType::Ptr &declaredType)
{
    Q_UNUSED(declaredType);
    const QVariant &variant = m_bindingHash.value(name);


    if(variant.isNull())
        return SequenceType::Ptr();
    else if(variant.userType() == qMetaTypeId<QIODevice *>())
        return CommonSequenceTypes::ExactlyOneAnyURI;
    else if(variant.userType() == qMetaTypeId<QXmlQuery>())
    {
        const QXmlQuery variableQuery(qvariant_cast<QXmlQuery>(variant));
        return variableQuery.d->expression()->staticType();
    }
    else
    {
        return makeGenericSequenceType(AtomicValue::qtToXDMType(qvariant_cast<QXmlItem>(variant)),
                                       Cardinality::exactlyOne());
    }
}

Item::Iterator::Ptr VariableLoader::evaluateSequence(const QXmlName name,
                                                     const DynamicContext::Ptr &context)
{

    const QVariant &variant = m_bindingHash.value(name);
    Q_ASSERT_X(!variant.isNull(), Q_FUNC_INFO,
               "We assume that we have a binding.");

    /* Same code as in the default clause below. */
    if(variant.userType() == qMetaTypeId<QIODevice *>())
        return makeSingletonIterator(itemForName(name));
    else if(variant.userType() == qMetaTypeId<QXmlQuery>())
    {
        const QXmlQuery variableQuery(qvariant_cast<QXmlQuery>(variant));

        return variableQuery.d->expression()->evaluateSequence(DynamicContext::Ptr(new TemporaryTreesRedirectingContext(variableQuery.d->dynamicContext(), context)));
    }

    const QVariant v(qvariant_cast<QXmlItem>(variant).toAtomicValue());

    switch(v.type())
    {
        case QVariant::StringList:
            return Item::Iterator::Ptr(new StringListIterator(v.toStringList()));
        case QVariant::List:
            return Item::Iterator::Ptr(new VariantListIterator(v.toList()));
        default:
            return makeSingletonIterator(itemForName(name));
    }
}

Item VariableLoader::itemForName(const QXmlName &name) const
{
    const QVariant &variant = m_bindingHash.value(name);

    if(variant.userType() == qMetaTypeId<QIODevice *>())
        return Item(AnyURI::fromValue(QLatin1String("tag:trolltech.com,2007:QtXmlPatterns:QIODeviceVariable:") + m_namePool->stringForLocalName(name.localName())));

    const QXmlItem item(qvariant_cast<QXmlItem>(variant));

    if(item.isNode())
        return Item::fromPublic(item);
    else
    {
        const QVariant atomicValue(item.toAtomicValue());
        /* If the atomicValue is null it means it doesn't exist in m_bindingHash, and therefore it must
         * be a QIODevice, since Patternist guarantees to only ask for variables that announceExternalVariable()
         * has accepted. */
        if(atomicValue.isNull())
            return Item(AnyURI::fromValue(QLatin1String("tag:trolltech.com,2007:QtXmlPatterns:QIODeviceVariable:") + m_namePool->stringForLocalName(name.localName())));
        else
            return AtomicValue::toXDM(atomicValue);
    }
}

Item VariableLoader::evaluateSingleton(const QXmlName name,
                                       const DynamicContext::Ptr &)
{
    return itemForName(name);
}

bool VariableLoader::isSameType(const QVariant &v1,
                                const QVariant &v2) const
{
    /* Are both of type QIODevice *? */
    if(v1.userType() == qMetaTypeId<QIODevice *>() && v1.userType() == v2.userType())
        return true;

    /* Ok, we have two QXmlItems. */
    const QXmlItem i1(qvariant_cast<QXmlItem>(v1));
    const QXmlItem i2(qvariant_cast<QXmlItem>(v2));

    if(i1.isNode())
    {
        Q_ASSERT(false);
        return false;
    }
    else if(i2.isAtomicValue())
        return i1.toAtomicValue().type() == i2.toAtomicValue().type();
    else
    {
        /* One is an atomic, the other is a node or they are null. */
        return false;
    }
}

void VariableLoader::removeBinding(const QXmlName &name)
{
    m_bindingHash.remove(name);
}

bool VariableLoader::hasBinding(const QXmlName &name) const
{
    return m_bindingHash.contains(name)
        || (m_previousLoader && m_previousLoader->hasBinding(name));
}

QVariant VariableLoader::valueFor(const QXmlName &name) const
{
    if(m_bindingHash.contains(name))
        return m_bindingHash.value(name);
    else if(m_previousLoader)
        return m_previousLoader->valueFor(name);
    else
        return QVariant();
}

void VariableLoader::addBinding(const QXmlName &name,
                                const QVariant &value)
{
    m_bindingHash.insert(name, value);
}

bool VariableLoader::invalidationRequired(const QXmlName &name,
                                          const QVariant &variant) const
{
    return hasBinding(name) && !isSameType(valueFor(name), variant);
}

QT_END_NAMESPACE