summaryrefslogtreecommitdiffstats
path: root/src/xmlpatterns/acceltree/qacceltreebuilder.cpp
blob: e752632923590a39f90cf6738a6e6e6f4bc7120e (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
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
/****************************************************************************
**
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

/**
 * @file
 * @short This file is included by qacceltreebuilder_p.h.
 * If you need includes in this file, put them in qacceltreebuilder_p.h, outside of the namespace.
 */

template <bool FromDocument>
AccelTreeBuilder<FromDocument>::AccelTreeBuilder(const QUrl &docURI,
                                                 const QUrl &baseURI,
                                                 const NamePool::Ptr &np,
                                                 ReportContext *const context,
                                                 Features features) : m_preNumber(-1)
                                                                    , m_isPreviousAtomic(false)
                                                                    , m_hasCharacters(false)
                                                                    , m_isCharactersCompressed(false)
                                                                    , m_namePool(np)
                                                                    , m_document(new AccelTree(docURI, baseURI))
                                                                    , m_skippedDocumentNodes(0)
                                                                    , m_documentURI(docURI)
                                                                    , m_context(context)
                                                                    , m_features(features)
{
    Q_ASSERT(m_namePool);

    /* TODO Perhaps we can merge m_ancestors and m_size
     * into one, and store a struct for the two instead? */
    m_ancestors.reserve(DefaultNodeStackSize);
    m_ancestors.push(-1);

    m_size.reserve(DefaultNodeStackSize);
    m_size.push(0);
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::startStructure()
{
    if(m_hasCharacters)
    {
        /* We create a node even if m_characters is empty.
         * Remember that `text {""}' creates one text node
         * with string value "". */

        ++m_preNumber;
        m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(),
                                                              currentParent(),
                                                              QXmlNodeModelIndex::Text,
                                                              m_isCharactersCompressed ? AccelTree::IsCompressed : 0));
        m_document->data.insert(m_preNumber, m_characters);
        ++m_size.top();

        m_characters.clear(); /* We don't want it added twice. */
        m_hasCharacters = false;

        if(m_isCharactersCompressed)
            m_isCharactersCompressed = false;
    }
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::item(const Item &it)
{
    Q_ASSERT(it);

    if(it.isAtomicValue())
    {
        if(m_isPreviousAtomic)
        {
            m_characters += QLatin1Char(' ');
            m_characters += it.stringValue();
        }
        else
        {
            m_isPreviousAtomic = true;
            const QString sv(it.stringValue());

            if(!sv.isEmpty())
            {
                m_characters += sv;
                m_hasCharacters = true;
            }
        }
    }
    else
        sendAsNode(it);
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::startElement(const QXmlName &name)
{
    startElement(name, 1, 1);
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::startElement(const QXmlName &name, qint64 line, qint64 column)
{
    startStructure();

    AccelTree::BasicNodeData data(currentDepth(), currentParent(), QXmlNodeModelIndex::Element, -1, name);
    m_document->basicData.append(data);
    if (m_features & SourceLocationsFeature)
        m_document->sourcePositions.insert(m_document->maximumPreNumber(), qMakePair(line, column));

    ++m_preNumber;
    m_ancestors.push(m_preNumber);

    ++m_size.top();
    m_size.push(0);

    /* With node constructors, we can receive names for which we have no namespace
     * constructors, such as in the query '<xs:space/>'. Since the 'xs' prefix has no
     * NamespaceConstructor in this case, we synthesize the namespace.
     *
     * In case we're constructing from an XML document we avoid the call because
     * although it's redundant, it's on extra virtual call for each element. */
    if(!FromDocument)
        namespaceBinding(QXmlName(name.namespaceURI(), 0, name.prefix()));

    m_isPreviousAtomic = false;
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::endElement()
{
    startStructure();
    const AccelTree::PreNumber index = m_ancestors.pop();
    AccelTree::BasicNodeData &data = m_document->basicData[index];

    /* Sub trees needs to be included in upper trees, so we add the count of this element
     * to our parent. */
    m_size[m_size.count() - 2] += m_size.top();

    data.setSize(m_size.pop());
    m_isPreviousAtomic = false;
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::attribute(const QXmlName &name, const QStringRef &value)
{
    /* Attributes adds a namespace binding, so lets synthesize one.
     *
     * We optimize by checking whether we have a namespace for which a binding would
     * be generated. Happens relatively rarely. */
    if(name.hasPrefix())
        namespaceBinding(QXmlName(name.namespaceURI(), 0, name.prefix()));

    m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(), currentParent(), QXmlNodeModelIndex::Attribute, 0, name));
    ++m_preNumber;
    ++m_size.top();

    m_isPreviousAtomic = false;

    if(name.namespaceURI() == StandardNamespaces::xml && name.localName() == StandardLocalNames::id)
    {
        const QString normalized(value.toString().simplified());

        if(QXmlUtils::isNCName(normalized))
        {
            const QXmlName::LocalNameCode id = m_namePool->allocateLocalName(normalized);

            const int oldSize = m_document->m_IDs.count();
            m_document->m_IDs.insert(id, currentParent());
            /* We don't run the value through m_attributeCompress here, because
             * the likelyhood of it deing identical to another attribute is
             * very small. */
            m_document->data.insert(m_preNumber, normalized);

            /**
             * In the case that we're called for doc-available(), m_context is
             * null, and we need to flag somehow that we failed to load this
             * document.
             */
            if(oldSize == m_document->m_IDs.count() && m_context) // TODO
            {
                Q_ASSERT(m_context);
                m_context->error(QtXmlPatterns::tr("An %1-attribute with value %2 has already been declared.")
                                                   .arg(formatKeyword("xml:id"),
                                                        formatData(normalized)),
                                 FromDocument ? ReportContext::FODC0002 : ReportContext::XQDY0091,
                                 this);
            }
        }
        else if(m_context) // TODO
        {
            Q_ASSERT(m_context);

            /* If we're building from an XML Document(e.g, we're fed from QXmlStreamReader, we raise FODC0002,
             * otherwise XQDY0091. */
            m_context->error(QtXmlPatterns::tr("An %1-attribute must have a "
                                               "valid %2 as value, which %3 isn't.").arg(formatKeyword("xml:id"),
                                                                                         formatType(m_namePool, BuiltinTypes::xsNCName),
                                                                                         formatData(value.toString())),
                             FromDocument ? ReportContext::FODC0002 : ReportContext::XQDY0091,
                             this);
        }
    }
    else
        m_document->data.insert(m_preNumber, *m_attributeCompress.insert(value.toString()));
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::characters(const QStringRef &ch)
{

    /* If a text node constructor appears by itself, a node needs to
     * be created. Therefore, we set m_hasCharacters
     * if we're the only node.
     * However, if the text node appears as a child of a document or element
     * node it is discarded if it's empty.
     */
    if(m_hasCharacters && m_isCharactersCompressed)
    {
        m_characters = CompressedWhitespace::decompress(m_characters);
        m_isCharactersCompressed = false;
    }

    m_characters += ch;

    m_isPreviousAtomic = false;
    m_hasCharacters = !m_characters.isEmpty() || m_preNumber == -1; /* -1 is our start value. */
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::whitespaceOnly(const QStringRef &ch)
{
    Q_ASSERT(!ch.isEmpty());
    Q_ASSERT(ch.toString().trimmed().isEmpty());

    /* This gets problematic due to how QXmlStreamReader works(which
     * is the only one we get whitespaceOnly() events from). Namely, text intermingled
     * with CDATA gets reported as individual Characters events, and
     * QXmlStreamReader::isWhitespace() can return differently for each of those. However,
     * it will occur very rarely, so this workaround of 1) mistakenly compressing 2) decompressing 3)
     * appending, will happen infrequently.
     */
    if(m_hasCharacters)
    {
        if(m_isCharactersCompressed)
        {
            m_characters = CompressedWhitespace::decompress(m_characters);
            m_isCharactersCompressed = false;
        }

        m_characters.append(ch.toString());
    }
    else
    {
        /* We haven't received a text node previously. */
        m_characters = CompressedWhitespace::compress(ch);
        m_isCharactersCompressed = true;
        m_isPreviousAtomic = false;
        m_hasCharacters = true;
    }
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::processingInstruction(const QXmlName &target,
                                                           const QString &data)
{
    startStructure();
    ++m_preNumber;
    m_document->data.insert(m_preNumber, data);

    m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(),
                                                          currentParent(),
                                                          QXmlNodeModelIndex::ProcessingInstruction,
                                                          0,
                                                          target));
    ++m_size.top();
    m_isPreviousAtomic = false;
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::comment(const QString &content)
{
    startStructure();
    m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(), currentParent(), QXmlNodeModelIndex::Comment, 0));
    ++m_preNumber;
    m_document->data.insert(m_preNumber, content);
    ++m_size.top();
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::namespaceBinding(const QXmlName &nb)
{
    /* Note, because attribute() sometimes generate namespaceBinding() calls, this function
     * can be called after attributes, in contrast to what the class documentation says. This is ok,
     * as long as we're not dealing with public API. */

    /* If we've received attributes, it means the element's size have changed and m_preNumber have advanced,
     * so "reverse back" to the actual element. */
    const AccelTree::PreNumber pn = m_preNumber - m_size.top();

    QVector<QXmlName> &nss = m_document->namespaces[pn];

    /* "xml" hasn't been declared for each node, AccelTree::namespaceBindings() adds it, so avoid it
     * such that we don't get duplicates. */
    if(nb.prefix() == StandardPrefixes::xml)
        return;

    /* If we already have the binding, skip it. */
    const int len = nss.count();
    for(int i = 0; i < len; ++i)
    {
        if(nss.at(i).prefix() == nb.prefix())
            return;
    }

    nss.append(nb);
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::startDocument()
{
    /* If we have already received nodes, we can't add a document node. */
    if(m_preNumber == -1) /* -1 is our start value. */
    {
        m_size.push(0);
        m_document->basicData.append(AccelTree::BasicNodeData(0, -1, QXmlNodeModelIndex::Document, -1));
        ++m_preNumber;
        m_ancestors.push(m_preNumber);
    }
    else
        ++m_skippedDocumentNodes;

    m_isPreviousAtomic = false;
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::endDocument()
{
    if(m_skippedDocumentNodes == 0)
    {
        /* Create text nodes, if we've received any. We do this only if we're the
         * top node because if we're getting this event as being a child of an element,
         * text nodes or atomic values can appear after us, and which must get
         * merged with the previous text.
         *
         * We call startStructure() before we pop the ancestor, such that the text node becomes
         * a child of this document node. */
        startStructure();

        m_document->basicData.first().setSize(m_size.pop());
        m_ancestors.pop();
    }
    else
        --m_skippedDocumentNodes;

    m_isPreviousAtomic = false;
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::atomicValue(const QVariant &value)
{
    Q_UNUSED(value);
    // TODO
}

template <bool FromDocument>
QAbstractXmlNodeModel::Ptr AccelTreeBuilder<FromDocument>::builtDocument()
{
    /* Create a text node, if we have received text in some way. */
    startStructure();
    m_document->printStats(m_namePool);

    return m_document;
}

template <bool FromDocument>
NodeBuilder::Ptr AccelTreeBuilder<FromDocument>::create(const QUrl &baseURI) const
{
    Q_UNUSED(baseURI);
    return NodeBuilder::Ptr(new AccelTreeBuilder(QUrl(), baseURI, m_namePool, m_context));
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::startOfSequence()
{
}

template <bool FromDocument>
void AccelTreeBuilder<FromDocument>::endOfSequence()
{
}

template <bool FromDocument>
const SourceLocationReflection *AccelTreeBuilder<FromDocument>::actualReflection() const
{
    return this;
}

template <bool FromDocument>
QSourceLocation AccelTreeBuilder<FromDocument>::sourceLocation() const
{
    if(m_documentURI.isEmpty())
        return QSourceLocation(QUrl(QLatin1String("AnonymousNodeTree")));
    else
        return QSourceLocation(m_documentURI);
}