source: trunk/src/xmlpatterns/acceltree/qacceltreebuilder.cpp@ 202

Last change on this file since 202 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 15.6 KB
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1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the QtXmlPatterns module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you are unsure which license is appropriate for your use, please
37** contact the sales department at qt-sales@nokia.com.
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42/**
43 * @file
44 * @short This file is included by qacceltreebuilder_p.h.
45 * If you need includes in this file, put them in qacceltreebuilder_p.h, outside of the namespace.
46 */
47
48template <bool FromDocument>
49AccelTreeBuilder<FromDocument>::AccelTreeBuilder(const QUrl &docURI,
50 const QUrl &baseURI,
51 const NamePool::Ptr &np,
52 ReportContext *const context) : m_preNumber(-1)
53 , m_isPreviousAtomic(false)
54 , m_hasCharacters(false)
55 , m_isCharactersCompressed(false)
56 , m_namePool(np)
57 , m_document(new AccelTree(docURI, baseURI))
58 , m_skippedDocumentNodes(0)
59 , m_documentURI(docURI)
60 , m_context(context)
61{
62 Q_ASSERT(m_namePool);
63
64 /* TODO Perhaps we can merge m_ancestors and m_size
65 * into one, and store a struct for the two instead? */
66 m_ancestors.reserve(DefaultNodeStackSize);
67 m_ancestors.push(-1);
68
69 m_size.reserve(DefaultNodeStackSize);
70 m_size.push(0);
71}
72
73template <bool FromDocument>
74void AccelTreeBuilder<FromDocument>::startStructure()
75{
76 if(m_hasCharacters)
77 {
78 /* We create a node even if m_characters is empty.
79 * Remember that `text {""}' creates one text node
80 * with string value "". */
81
82 ++m_preNumber;
83 m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(),
84 currentParent(),
85 QXmlNodeModelIndex::Text,
86 m_isCharactersCompressed ? AccelTree::IsCompressed : 0));
87 m_document->data.insert(m_preNumber, m_characters);
88 ++m_size.top();
89
90 m_characters.clear(); /* We don't want it added twice. */
91 m_hasCharacters = false;
92
93 if(m_isCharactersCompressed)
94 m_isCharactersCompressed = false;
95 }
96}
97
98template <bool FromDocument>
99void AccelTreeBuilder<FromDocument>::item(const Item &it)
100{
101 Q_ASSERT(it);
102
103 if(it.isAtomicValue())
104 {
105 if(m_isPreviousAtomic)
106 {
107 m_characters += QLatin1Char(' ');
108 m_characters += it.stringValue();
109 }
110 else
111 {
112 m_isPreviousAtomic = true;
113 const QString sv(it.stringValue());
114
115 if(!sv.isEmpty())
116 {
117 m_characters += sv;
118 m_hasCharacters = true;
119 }
120 }
121 }
122 else
123 sendAsNode(it);
124}
125
126template <bool FromDocument>
127void AccelTreeBuilder<FromDocument>::startElement(const QXmlName &name)
128{
129 startStructure();
130
131 m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(), currentParent(), QXmlNodeModelIndex::Element, -1, name));
132
133 ++m_preNumber;
134 m_ancestors.push(m_preNumber);
135
136 ++m_size.top();
137 m_size.push(0);
138
139 /* With node constructors, we can receive names for which we have no namespace
140 * constructors, such as in the query '<xs:space/>'. Since the 'xs' prefix has no
141 * NamespaceConstructor in this case, we synthesize the namespace.
142 *
143 * In case we're constructing from an XML document we avoid the call because
144 * although it's redundant, it's on extra virtual call for each element. */
145 if(!FromDocument)
146 namespaceBinding(QXmlName(name.namespaceURI(), 0, name.prefix()));
147
148 m_isPreviousAtomic = false;
149}
150
151template <bool FromDocument>
152void AccelTreeBuilder<FromDocument>::endElement()
153{
154 startStructure();
155 const AccelTree::PreNumber index = m_ancestors.pop();
156 AccelTree::BasicNodeData &data = m_document->basicData[index];
157
158 /* Sub trees needs to be included in upper trees, so we add the count of this element
159 * to our parent. */
160 m_size[m_size.count() - 2] += m_size.top();
161
162 data.setSize(m_size.pop());
163 m_isPreviousAtomic = false;
164}
165
166template <bool FromDocument>
167void AccelTreeBuilder<FromDocument>::attribute(const QXmlName &name, const QStringRef &value)
168{
169 /* Attributes adds a namespace binding, so lets synthesize one.
170 *
171 * We optimize by checking whether we have a namespace for which a binding would
172 * be generated. Happens relatively rarely. */
173 if(name.hasPrefix())
174 namespaceBinding(QXmlName(name.namespaceURI(), 0, name.prefix()));
175
176 m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(), currentParent(), QXmlNodeModelIndex::Attribute, 0, name));
177 ++m_preNumber;
178 ++m_size.top();
179
180 m_isPreviousAtomic = false;
181
182 if(name.namespaceURI() == StandardNamespaces::xml && name.localName() == StandardLocalNames::id)
183 {
184 const QString normalized(value.toString().simplified());
185
186 if(QXmlUtils::isNCName(normalized))
187 {
188 const QXmlName::LocalNameCode id = m_namePool->allocateLocalName(normalized);
189
190 const int oldSize = m_document->m_IDs.count();
191 m_document->m_IDs.insert(id, currentParent());
192 /* We don't run the value through m_attributeCompress here, because
193 * the likelyhood of it deing identical to another attribute is
194 * very small. */
195 m_document->data.insert(m_preNumber, normalized);
196
197 /**
198 * In the case that we're called for doc-available(), m_context is
199 * null, and we need to flag somehow that we failed to load this
200 * document.
201 */
202 if(oldSize == m_document->m_IDs.count() && m_context) // TODO
203 {
204 Q_ASSERT(m_context);
205 m_context->error(QtXmlPatterns::tr("An %1-attribute with value %2 has already been declared.")
206 .arg(formatKeyword("xml:id"),
207 formatData(normalized)),
208 FromDocument ? ReportContext::FODC0002 : ReportContext::XQDY0091,
209 this);
210 }
211 }
212 else if(m_context) // TODO
213 {
214 Q_ASSERT(m_context);
215
216 /* If we're building from an XML Document(e.g, we're fed from QXmlStreamReader, we raise FODC0002,
217 * otherwise XQDY0091. */
218 m_context->error(QtXmlPatterns::tr("An %1-attribute must have a "
219 "valid %2 as value, which %3 isn't.").arg(formatKeyword("xml:id"),
220 formatType(m_namePool, BuiltinTypes::xsNCName),
221 formatData(value.toString())),
222 FromDocument ? ReportContext::FODC0002 : ReportContext::XQDY0091,
223 this);
224 }
225 }
226 else
227 m_document->data.insert(m_preNumber, *m_attributeCompress.insert(value.toString()));
228}
229
230template <bool FromDocument>
231void AccelTreeBuilder<FromDocument>::characters(const QStringRef &ch)
232{
233
234 /* If a text node constructor appears by itself, a node needs to
235 * be created. Therefore, we set m_hasCharacters
236 * if we're the only node.
237 * However, if the text node appears as a child of a document or element
238 * node it is discarded if it's empty.
239 */
240 if(m_hasCharacters && m_isCharactersCompressed)
241 {
242 m_characters = CompressedWhitespace::decompress(m_characters);
243 m_isCharactersCompressed = false;
244 }
245
246 m_characters += ch;
247
248 m_isPreviousAtomic = false;
249 m_hasCharacters = !m_characters.isEmpty() || m_preNumber == -1; /* -1 is our start value. */
250}
251
252template <bool FromDocument>
253void AccelTreeBuilder<FromDocument>::whitespaceOnly(const QStringRef &ch)
254{
255 Q_ASSERT(!ch.isEmpty());
256 Q_ASSERT(ch.toString().trimmed().isEmpty());
257
258 /* This gets problematic due to how QXmlStreamReader works(which
259 * is the only one we get whitespaceOnly() events from). Namely, text intermingled
260 * with CDATA gets reported as individual Characters events, and
261 * QXmlStreamReader::isWhitespace() can return differently for each of those. However,
262 * it will occur very rarely, so this workaround of 1) mistakenly compressing 2) decompressing 3)
263 * appending, will happen infrequently.
264 */
265 if(m_hasCharacters)
266 {
267 if(m_isCharactersCompressed)
268 {
269 m_characters = CompressedWhitespace::decompress(m_characters);
270 m_isCharactersCompressed = false;
271 }
272
273 m_characters.append(ch.toString());
274 }
275 else
276 {
277 /* We haven't received a text node previously. */
278 m_characters = CompressedWhitespace::compress(ch);
279 m_isCharactersCompressed = true;
280 m_isPreviousAtomic = false;
281 m_hasCharacters = true;
282 }
283}
284
285template <bool FromDocument>
286void AccelTreeBuilder<FromDocument>::processingInstruction(const QXmlName &target,
287 const QString &data)
288{
289 startStructure();
290 ++m_preNumber;
291 m_document->data.insert(m_preNumber, data);
292
293 m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(),
294 currentParent(),
295 QXmlNodeModelIndex::ProcessingInstruction,
296 0,
297 target));
298 ++m_size.top();
299 m_isPreviousAtomic = false;
300}
301
302template <bool FromDocument>
303void AccelTreeBuilder<FromDocument>::comment(const QString &content)
304{
305 startStructure();
306 m_document->basicData.append(AccelTree::BasicNodeData(currentDepth(), currentParent(), QXmlNodeModelIndex::Comment, 0));
307 ++m_preNumber;
308 m_document->data.insert(m_preNumber, content);
309 ++m_size.top();
310}
311
312template <bool FromDocument>
313void AccelTreeBuilder<FromDocument>::namespaceBinding(const QXmlName &nb)
314{
315 /* Note, because attribute() sometimes generate namespaceBinding() calls, this function
316 * can be called after attributes, in contrast to what the class documentation says. This is ok,
317 * as long as we're not dealing with public API. */
318
319 /* If we've received attributes, it means the element's size have changed and m_preNumber have advanced,
320 * so "reverse back" to the actual element. */
321 const AccelTree::PreNumber pn = m_preNumber - m_size.top();
322
323 QVector<QXmlName> &nss = m_document->namespaces[pn];
324
325 /* "xml" hasn't been declared for each node, AccelTree::namespaceBindings() adds it, so avoid it
326 * such that we don't get duplicates. */
327 if(nb.prefix() == StandardPrefixes::xml)
328 return;
329
330 /* If we already have the binding, skip it. */
331 const int len = nss.count();
332 for(int i = 0; i < len; ++i)
333 {
334 if(nss.at(i).prefix() == nb.prefix())
335 return;
336 }
337
338 nss.append(nb);
339}
340
341template <bool FromDocument>
342void AccelTreeBuilder<FromDocument>::startDocument()
343{
344 /* If we have already received nodes, we can't add a document node. */
345 if(m_preNumber == -1) /* -1 is our start value. */
346 {
347 m_size.push(0);
348 m_document->basicData.append(AccelTree::BasicNodeData(0, -1, QXmlNodeModelIndex::Document, -1));
349 ++m_preNumber;
350 m_ancestors.push(m_preNumber);
351 }
352 else
353 ++m_skippedDocumentNodes;
354
355 m_isPreviousAtomic = false;
356}
357
358template <bool FromDocument>
359void AccelTreeBuilder<FromDocument>::endDocument()
360{
361 if(m_skippedDocumentNodes == 0)
362 {
363 /* Create text nodes, if we've received any. We do this only if we're the
364 * top node because if we're getting this event as being a child of an element,
365 * text nodes or atomic values can appear after us, and which must get
366 * merged with the previous text.
367 *
368 * We call startStructure() before we pop the ancestor, such that the text node becomes
369 * a child of this document node. */
370 startStructure();
371
372 m_document->basicData.first().setSize(m_size.pop());
373 m_ancestors.pop();
374 }
375 else
376 --m_skippedDocumentNodes;
377
378 m_isPreviousAtomic = false;
379}
380
381template <bool FromDocument>
382void AccelTreeBuilder<FromDocument>::atomicValue(const QVariant &value)
383{
384 Q_UNUSED(value);
385 // TODO
386}
387
388template <bool FromDocument>
389QAbstractXmlNodeModel::Ptr AccelTreeBuilder<FromDocument>::builtDocument()
390{
391 /* Create a text node, if we have received text in some way. */
392 startStructure();
393 m_document->printStats(m_namePool);
394
395 return m_document;
396}
397
398template <bool FromDocument>
399NodeBuilder::Ptr AccelTreeBuilder<FromDocument>::create(const QUrl &baseURI) const
400{
401 Q_UNUSED(baseURI);
402 return NodeBuilder::Ptr(new AccelTreeBuilder(QUrl(), baseURI, m_namePool, m_context));
403}
404
405template <bool FromDocument>
406void AccelTreeBuilder<FromDocument>::startOfSequence()
407{
408}
409
410template <bool FromDocument>
411void AccelTreeBuilder<FromDocument>::endOfSequence()
412{
413}
414
415template <bool FromDocument>
416const SourceLocationReflection *AccelTreeBuilder<FromDocument>::actualReflection() const
417{
418 return this;
419}
420
421template <bool FromDocument>
422QSourceLocation AccelTreeBuilder<FromDocument>::sourceLocation() const
423{
424 if(m_documentURI.isEmpty())
425 return QSourceLocation(QUrl(QLatin1String("AnonymousNodeTree")));
426 else
427 return QSourceLocation(m_documentURI);
428}
429
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