1 /*
2 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include "config.h"
22 #include "core/css/StyleSheetContents.h"
23
24 #include "core/css/CSSStyleSheet.h"
25 #include "core/css/MediaList.h"
26 #include "core/css/StylePropertySet.h"
27 #include "core/css/StyleRule.h"
28 #include "core/css/StyleRuleImport.h"
29 #include "core/css/parser/CSSParser.h"
30 #include "core/dom/Document.h"
31 #include "core/dom/Node.h"
32 #include "core/dom/StyleEngine.h"
33 #include "core/fetch/CSSStyleSheetResource.h"
34 #include "core/frame/UseCounter.h"
35 #include "platform/TraceEvent.h"
36 #include "platform/weborigin/SecurityOrigin.h"
37 #include "wtf/Deque.h"
38
39 namespace blink {
40
41 // Rough size estimate for the memory cache.
estimatedSizeInBytes() const42 unsigned StyleSheetContents::estimatedSizeInBytes() const
43 {
44 // Note that this does not take into account size of the strings hanging from various objects.
45 // The assumption is that nearly all of of them are atomic and would exist anyway.
46 unsigned size = sizeof(*this);
47
48 // FIXME: This ignores the children of media rules.
49 // Most rules are StyleRules.
50 size += ruleCount() * StyleRule::averageSizeInBytes();
51
52 for (unsigned i = 0; i < m_importRules.size(); ++i) {
53 if (StyleSheetContents* sheet = m_importRules[i]->styleSheet())
54 size += sheet->estimatedSizeInBytes();
55 }
56 return size;
57 }
58
StyleSheetContents(StyleRuleImport * ownerRule,const String & originalURL,const CSSParserContext & context)59 StyleSheetContents::StyleSheetContents(StyleRuleImport* ownerRule, const String& originalURL, const CSSParserContext& context)
60 : m_ownerRule(ownerRule)
61 , m_originalURL(originalURL)
62 , m_hasSyntacticallyValidCSSHeader(true)
63 , m_didLoadErrorOccur(false)
64 , m_usesRemUnits(false)
65 , m_isMutable(false)
66 , m_isInMemoryCache(false)
67 , m_hasFontFaceRule(false)
68 , m_hasMediaQueries(false)
69 , m_hasSingleOwnerDocument(true)
70 , m_parserContext(context)
71 {
72 }
73
StyleSheetContents(const StyleSheetContents & o)74 StyleSheetContents::StyleSheetContents(const StyleSheetContents& o)
75 : m_ownerRule(nullptr)
76 , m_originalURL(o.m_originalURL)
77 , m_encodingFromCharsetRule(o.m_encodingFromCharsetRule)
78 , m_importRules(o.m_importRules.size())
79 , m_childRules(o.m_childRules.size())
80 , m_namespaces(o.m_namespaces)
81 , m_hasSyntacticallyValidCSSHeader(o.m_hasSyntacticallyValidCSSHeader)
82 , m_didLoadErrorOccur(false)
83 , m_usesRemUnits(o.m_usesRemUnits)
84 , m_isMutable(false)
85 , m_isInMemoryCache(false)
86 , m_hasFontFaceRule(o.m_hasFontFaceRule)
87 , m_hasMediaQueries(o.m_hasMediaQueries)
88 , m_hasSingleOwnerDocument(true)
89 , m_parserContext(o.m_parserContext)
90 {
91 ASSERT(o.isCacheable());
92
93 // FIXME: Copy import rules.
94 ASSERT(o.m_importRules.isEmpty());
95
96 for (unsigned i = 0; i < m_childRules.size(); ++i)
97 m_childRules[i] = o.m_childRules[i]->copy();
98 }
99
~StyleSheetContents()100 StyleSheetContents::~StyleSheetContents()
101 {
102 #if !ENABLE(OILPAN)
103 clearRules();
104 #endif
105 }
106
setHasSyntacticallyValidCSSHeader(bool isValidCss)107 void StyleSheetContents::setHasSyntacticallyValidCSSHeader(bool isValidCss)
108 {
109 if (!isValidCss) {
110 if (Document* document = clientSingleOwnerDocument())
111 removeSheetFromCache(document);
112 }
113 m_hasSyntacticallyValidCSSHeader = isValidCss;
114 }
115
isCacheable() const116 bool StyleSheetContents::isCacheable() const
117 {
118 // This would require dealing with multiple clients for load callbacks.
119 if (!loadCompleted())
120 return false;
121 // FIXME: StyleSheets with media queries can't be cached because their RuleSet
122 // is processed differently based off the media queries, which might resolve
123 // differently depending on the context of the parent CSSStyleSheet (e.g.
124 // if they are in differently sized iframes). Once RuleSets are media query
125 // agnostic, we can restore sharing of StyleSheetContents with medea queries.
126 if (m_hasMediaQueries)
127 return false;
128 // FIXME: Support copying import rules.
129 if (!m_importRules.isEmpty())
130 return false;
131 // FIXME: Support cached stylesheets in import rules.
132 if (m_ownerRule)
133 return false;
134 if (m_didLoadErrorOccur)
135 return false;
136 // It is not the original sheet anymore.
137 if (m_isMutable)
138 return false;
139 // If the header is valid we are not going to need to check the SecurityOrigin.
140 // FIXME: Valid mime type avoids the check too.
141 if (!m_hasSyntacticallyValidCSSHeader)
142 return false;
143 return true;
144 }
145
parserAppendRule(PassRefPtrWillBeRawPtr<StyleRuleBase> rule)146 void StyleSheetContents::parserAppendRule(PassRefPtrWillBeRawPtr<StyleRuleBase> rule)
147 {
148 ASSERT(!rule->isCharsetRule());
149 if (rule->isImportRule()) {
150 // Parser enforces that @import rules come before anything else except @charset.
151 ASSERT(m_childRules.isEmpty());
152 StyleRuleImport* importRule = toStyleRuleImport(rule.get());
153 if (importRule->mediaQueries())
154 setHasMediaQueries();
155 m_importRules.append(importRule);
156 m_importRules.last()->setParentStyleSheet(this);
157 m_importRules.last()->requestStyleSheet();
158 return;
159 }
160
161 // Add warning message to inspector if dpi/dpcm values are used for screen media.
162 if (rule->isMediaRule()) {
163 setHasMediaQueries();
164 reportMediaQueryWarningIfNeeded(singleOwnerDocument(), toStyleRuleMedia(rule.get())->mediaQueries());
165 }
166
167 m_childRules.append(rule);
168 }
169
setHasMediaQueries()170 void StyleSheetContents::setHasMediaQueries()
171 {
172 m_hasMediaQueries = true;
173 if (parentStyleSheet())
174 parentStyleSheet()->setHasMediaQueries();
175 }
176
ruleAt(unsigned index) const177 StyleRuleBase* StyleSheetContents::ruleAt(unsigned index) const
178 {
179 ASSERT_WITH_SECURITY_IMPLICATION(index < ruleCount());
180
181 unsigned childVectorIndex = index;
182 if (hasCharsetRule()) {
183 if (index == 0)
184 return 0;
185 --childVectorIndex;
186 }
187 if (childVectorIndex < m_importRules.size())
188 return m_importRules[childVectorIndex].get();
189
190 childVectorIndex -= m_importRules.size();
191 return m_childRules[childVectorIndex].get();
192 }
193
ruleCount() const194 unsigned StyleSheetContents::ruleCount() const
195 {
196 unsigned result = 0;
197 result += hasCharsetRule() ? 1 : 0;
198 result += m_importRules.size();
199 result += m_childRules.size();
200 return result;
201 }
202
clearCharsetRule()203 void StyleSheetContents::clearCharsetRule()
204 {
205 m_encodingFromCharsetRule = String();
206 }
207
clearRules()208 void StyleSheetContents::clearRules()
209 {
210 for (unsigned i = 0; i < m_importRules.size(); ++i) {
211 ASSERT(m_importRules.at(i)->parentStyleSheet() == this);
212 m_importRules[i]->clearParentStyleSheet();
213 }
214 m_importRules.clear();
215 m_childRules.clear();
216 clearCharsetRule();
217 }
218
parserSetEncodingFromCharsetRule(const String & encoding)219 void StyleSheetContents::parserSetEncodingFromCharsetRule(const String& encoding)
220 {
221 // Parser enforces that there is ever only one @charset.
222 ASSERT(m_encodingFromCharsetRule.isNull());
223 m_encodingFromCharsetRule = encoding;
224 }
225
wrapperInsertRule(PassRefPtrWillBeRawPtr<StyleRuleBase> rule,unsigned index)226 bool StyleSheetContents::wrapperInsertRule(PassRefPtrWillBeRawPtr<StyleRuleBase> rule, unsigned index)
227 {
228 ASSERT(m_isMutable);
229 ASSERT_WITH_SECURITY_IMPLICATION(index <= ruleCount());
230 // Parser::parseRule doesn't currently allow @charset so we don't need to deal with it.
231 ASSERT(!rule->isCharsetRule());
232
233 unsigned childVectorIndex = index;
234 // m_childRules does not contain @charset which is always in index 0 if it exists.
235 if (hasCharsetRule()) {
236 if (childVectorIndex == 0) {
237 // Nothing can be inserted before @charset.
238 return false;
239 }
240 --childVectorIndex;
241 }
242
243 if (childVectorIndex < m_importRules.size() || (childVectorIndex == m_importRules.size() && rule->isImportRule())) {
244 // Inserting non-import rule before @import is not allowed.
245 if (!rule->isImportRule())
246 return false;
247
248 StyleRuleImport* importRule = toStyleRuleImport(rule.get());
249 if (importRule->mediaQueries())
250 setHasMediaQueries();
251
252 m_importRules.insert(childVectorIndex, importRule);
253 m_importRules[childVectorIndex]->setParentStyleSheet(this);
254 m_importRules[childVectorIndex]->requestStyleSheet();
255 // FIXME: Stylesheet doesn't actually change meaningfully before the imported sheets are loaded.
256 return true;
257 }
258 // Inserting @import rule after a non-import rule is not allowed.
259 if (rule->isImportRule())
260 return false;
261
262 if (rule->isMediaRule())
263 setHasMediaQueries();
264
265 childVectorIndex -= m_importRules.size();
266
267 if (rule->isFontFaceRule())
268 setHasFontFaceRule(true);
269 m_childRules.insert(childVectorIndex, rule);
270 return true;
271 }
272
wrapperDeleteRule(unsigned index)273 void StyleSheetContents::wrapperDeleteRule(unsigned index)
274 {
275 ASSERT(m_isMutable);
276 ASSERT_WITH_SECURITY_IMPLICATION(index < ruleCount());
277
278 unsigned childVectorIndex = index;
279 if (hasCharsetRule()) {
280 if (childVectorIndex == 0) {
281 clearCharsetRule();
282 return;
283 }
284 --childVectorIndex;
285 }
286 if (childVectorIndex < m_importRules.size()) {
287 m_importRules[childVectorIndex]->clearParentStyleSheet();
288 if (m_importRules[childVectorIndex]->isFontFaceRule())
289 notifyRemoveFontFaceRule(toStyleRuleFontFace(m_importRules[childVectorIndex].get()));
290 m_importRules.remove(childVectorIndex);
291 return;
292 }
293 childVectorIndex -= m_importRules.size();
294
295 if (m_childRules[childVectorIndex]->isFontFaceRule())
296 notifyRemoveFontFaceRule(toStyleRuleFontFace(m_childRules[childVectorIndex].get()));
297 m_childRules.remove(childVectorIndex);
298 }
299
parserAddNamespace(const AtomicString & prefix,const AtomicString & uri)300 void StyleSheetContents::parserAddNamespace(const AtomicString& prefix, const AtomicString& uri)
301 {
302 if (uri.isNull() || prefix.isNull())
303 return;
304 PrefixNamespaceURIMap::AddResult result = m_namespaces.add(prefix, uri);
305 if (result.isNewEntry)
306 return;
307 result.storedValue->value = uri;
308 }
309
determineNamespace(const AtomicString & prefix)310 const AtomicString& StyleSheetContents::determineNamespace(const AtomicString& prefix)
311 {
312 if (prefix.isNull())
313 return nullAtom; // No namespace. If an element/attribute has a namespace, we won't match it.
314 if (prefix == starAtom)
315 return starAtom; // We'll match any namespace.
316 return m_namespaces.get(prefix);
317 }
318
parseAuthorStyleSheet(const CSSStyleSheetResource * cachedStyleSheet,const SecurityOrigin * securityOrigin)319 void StyleSheetContents::parseAuthorStyleSheet(const CSSStyleSheetResource* cachedStyleSheet, const SecurityOrigin* securityOrigin)
320 {
321 TRACE_EVENT0("blink", "StyleSheetContents::parseAuthorStyleSheet");
322
323 bool quirksMode = isQuirksModeBehavior(m_parserContext.mode());
324
325 bool enforceMIMEType = !quirksMode;
326 bool hasValidMIMEType = false;
327 String sheetText = cachedStyleSheet->sheetText(enforceMIMEType, &hasValidMIMEType);
328
329 CSSParserContext context(parserContext(), UseCounter::getFrom(this));
330 CSSParser::parseSheet(context, this, sheetText, TextPosition::minimumPosition(), 0, true);
331
332 // If we're loading a stylesheet cross-origin, and the MIME type is not standard, require the CSS
333 // to at least start with a syntactically valid CSS rule.
334 // This prevents an attacker playing games by injecting CSS strings into HTML, XML, JSON, etc. etc.
335 if (!hasValidMIMEType && !hasSyntacticallyValidCSSHeader()) {
336 bool isCrossOriginCSS = !securityOrigin || !securityOrigin->canRequest(baseURL());
337 if (isCrossOriginCSS) {
338 clearRules();
339 return;
340 }
341 }
342 }
343
parseString(const String & sheetText)344 bool StyleSheetContents::parseString(const String& sheetText)
345 {
346 return parseStringAtPosition(sheetText, TextPosition::minimumPosition(), false);
347 }
348
parseStringAtPosition(const String & sheetText,const TextPosition & startPosition,bool createdByParser)349 bool StyleSheetContents::parseStringAtPosition(const String& sheetText, const TextPosition& startPosition, bool createdByParser)
350 {
351 CSSParserContext context(parserContext(), UseCounter::getFrom(this));
352 CSSParser::parseSheet(context, this, sheetText, startPosition, 0, createdByParser);
353
354 return true;
355 }
356
isLoading() const357 bool StyleSheetContents::isLoading() const
358 {
359 for (unsigned i = 0; i < m_importRules.size(); ++i) {
360 if (m_importRules[i]->isLoading())
361 return true;
362 }
363 return false;
364 }
365
loadCompleted() const366 bool StyleSheetContents::loadCompleted() const
367 {
368 StyleSheetContents* parentSheet = parentStyleSheet();
369 if (parentSheet)
370 return parentSheet->loadCompleted();
371
372 StyleSheetContents* root = rootStyleSheet();
373 return root->m_loadingClients.isEmpty();
374 }
375
checkLoaded()376 void StyleSheetContents::checkLoaded()
377 {
378 if (isLoading())
379 return;
380
381 // Avoid |this| being deleted by scripts that run via
382 // ScriptableDocumentParser::executeScriptsWaitingForResources().
383 // See https://bugs.webkit.org/show_bug.cgi?id=95106
384 RefPtrWillBeRawPtr<StyleSheetContents> protect(this);
385
386 StyleSheetContents* parentSheet = parentStyleSheet();
387 if (parentSheet) {
388 parentSheet->checkLoaded();
389 return;
390 }
391
392 ASSERT(this == rootStyleSheet());
393 if (m_loadingClients.isEmpty())
394 return;
395
396 // Avoid |CSSSStyleSheet| and |ownerNode| being deleted by scripts that run via
397 // ScriptableDocumentParser::executeScriptsWaitingForResources(). Also protect
398 // the |CSSStyleSheet| from being deleted during iteration via the |sheetLoaded|
399 // method.
400 //
401 // When a sheet is loaded it is moved from the set of loading clients
402 // to the set of completed clients. We therefore need the copy in order to
403 // not modify the set while iterating it.
404 WillBeHeapVector<RefPtrWillBeMember<CSSStyleSheet> > loadingClients;
405 copyToVector(m_loadingClients, loadingClients);
406
407 for (unsigned i = 0; i < loadingClients.size(); ++i) {
408 if (loadingClients[i]->loadCompleted())
409 continue;
410
411 // sheetLoaded might be invoked after its owner node is removed from document.
412 if (RefPtrWillBeRawPtr<Node> ownerNode = loadingClients[i]->ownerNode()) {
413 if (loadingClients[i]->sheetLoaded())
414 ownerNode->notifyLoadedSheetAndAllCriticalSubresources(m_didLoadErrorOccur);
415 }
416 }
417 }
418
notifyLoadedSheet(const CSSStyleSheetResource * sheet)419 void StyleSheetContents::notifyLoadedSheet(const CSSStyleSheetResource* sheet)
420 {
421 ASSERT(sheet);
422 m_didLoadErrorOccur |= sheet->errorOccurred();
423 // updateLayoutIgnorePendingStyleSheets can cause us to create the RuleSet on this
424 // sheet before its imports have loaded. So clear the RuleSet when the imports
425 // load since the import's subrules are flattened into its parent sheet's RuleSet.
426 clearRuleSet();
427 }
428
startLoadingDynamicSheet()429 void StyleSheetContents::startLoadingDynamicSheet()
430 {
431 StyleSheetContents* root = rootStyleSheet();
432 for (ClientsIterator it = root->m_loadingClients.begin(); it != root->m_loadingClients.end(); ++it)
433 (*it)->startLoadingDynamicSheet();
434 // Copy the completed clients to a vector for iteration.
435 // startLoadingDynamicSheet will move the style sheet from the
436 // completed state to the loading state which modifies the set of
437 // completed clients. We therefore need the copy in order to not
438 // modify the set of completed clients while iterating it.
439 WillBeHeapVector<RawPtrWillBeMember<CSSStyleSheet> > completedClients;
440 copyToVector(root->m_completedClients, completedClients);
441 for (unsigned i = 0; i < completedClients.size(); ++i)
442 completedClients[i]->startLoadingDynamicSheet();
443 }
444
rootStyleSheet() const445 StyleSheetContents* StyleSheetContents::rootStyleSheet() const
446 {
447 const StyleSheetContents* root = this;
448 while (root->parentStyleSheet())
449 root = root->parentStyleSheet();
450 return const_cast<StyleSheetContents*>(root);
451 }
452
hasSingleOwnerNode() const453 bool StyleSheetContents::hasSingleOwnerNode() const
454 {
455 return rootStyleSheet()->hasOneClient();
456 }
457
singleOwnerNode() const458 Node* StyleSheetContents::singleOwnerNode() const
459 {
460 StyleSheetContents* root = rootStyleSheet();
461 if (!root->hasOneClient())
462 return 0;
463 if (root->m_loadingClients.size())
464 return (*root->m_loadingClients.begin())->ownerNode();
465 return (*root->m_completedClients.begin())->ownerNode();
466 }
467
singleOwnerDocument() const468 Document* StyleSheetContents::singleOwnerDocument() const
469 {
470 StyleSheetContents* root = rootStyleSheet();
471 return root->clientSingleOwnerDocument();
472 }
473
completeURL(const String & url) const474 KURL StyleSheetContents::completeURL(const String& url) const
475 {
476 // FIXME: This is only OK when we have a singleOwnerNode, right?
477 return m_parserContext.completeURL(url);
478 }
479
childRulesHaveFailedOrCanceledSubresources(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase>> & rules)480 static bool childRulesHaveFailedOrCanceledSubresources(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& rules)
481 {
482 for (unsigned i = 0; i < rules.size(); ++i) {
483 const StyleRuleBase* rule = rules[i].get();
484 switch (rule->type()) {
485 case StyleRuleBase::Style:
486 if (toStyleRule(rule)->properties().hasFailedOrCanceledSubresources())
487 return true;
488 break;
489 case StyleRuleBase::FontFace:
490 if (toStyleRuleFontFace(rule)->properties().hasFailedOrCanceledSubresources())
491 return true;
492 break;
493 case StyleRuleBase::Media:
494 if (childRulesHaveFailedOrCanceledSubresources(toStyleRuleMedia(rule)->childRules()))
495 return true;
496 break;
497 case StyleRuleBase::Import:
498 ASSERT_NOT_REACHED();
499 case StyleRuleBase::Page:
500 case StyleRuleBase::Keyframes:
501 case StyleRuleBase::Unknown:
502 case StyleRuleBase::Charset:
503 case StyleRuleBase::Keyframe:
504 case StyleRuleBase::Supports:
505 case StyleRuleBase::Viewport:
506 case StyleRuleBase::Filter:
507 break;
508 }
509 }
510 return false;
511 }
512
hasFailedOrCanceledSubresources() const513 bool StyleSheetContents::hasFailedOrCanceledSubresources() const
514 {
515 ASSERT(isCacheable());
516 return childRulesHaveFailedOrCanceledSubresources(m_childRules);
517 }
518
clientSingleOwnerDocument() const519 Document* StyleSheetContents::clientSingleOwnerDocument() const
520 {
521 if (!m_hasSingleOwnerDocument || clientSize() <= 0)
522 return 0;
523
524 if (m_loadingClients.size())
525 return (*m_loadingClients.begin())->ownerDocument();
526 return (*m_completedClients.begin())->ownerDocument();
527 }
528
parentStyleSheet() const529 StyleSheetContents* StyleSheetContents::parentStyleSheet() const
530 {
531 return m_ownerRule ? m_ownerRule->parentStyleSheet() : 0;
532 }
533
registerClient(CSSStyleSheet * sheet)534 void StyleSheetContents::registerClient(CSSStyleSheet* sheet)
535 {
536 ASSERT(!m_loadingClients.contains(sheet) && !m_completedClients.contains(sheet));
537
538 // InspectorCSSAgent::buildObjectForRule creates CSSStyleSheet without any owner node.
539 if (!sheet->ownerDocument())
540 return;
541
542 if (Document* document = clientSingleOwnerDocument()) {
543 if (sheet->ownerDocument() != document)
544 m_hasSingleOwnerDocument = false;
545 }
546 m_loadingClients.add(sheet);
547 }
548
unregisterClient(CSSStyleSheet * sheet)549 void StyleSheetContents::unregisterClient(CSSStyleSheet* sheet)
550 {
551 m_loadingClients.remove(sheet);
552 m_completedClients.remove(sheet);
553
554 if (!sheet->ownerDocument() || !m_loadingClients.isEmpty() || !m_completedClients.isEmpty())
555 return;
556
557 if (m_hasSingleOwnerDocument)
558 removeSheetFromCache(sheet->ownerDocument());
559 m_hasSingleOwnerDocument = true;
560 }
561
clientLoadCompleted(CSSStyleSheet * sheet)562 void StyleSheetContents::clientLoadCompleted(CSSStyleSheet* sheet)
563 {
564 ASSERT(m_loadingClients.contains(sheet) || !sheet->ownerDocument());
565 m_loadingClients.remove(sheet);
566 // In m_ownerNode->sheetLoaded, the CSSStyleSheet might be detached.
567 // (i.e. clearOwnerNode was invoked.)
568 // In this case, we don't need to add the stylesheet to completed clients.
569 if (!sheet->ownerDocument())
570 return;
571 m_completedClients.add(sheet);
572 }
573
clientLoadStarted(CSSStyleSheet * sheet)574 void StyleSheetContents::clientLoadStarted(CSSStyleSheet* sheet)
575 {
576 ASSERT(m_completedClients.contains(sheet));
577 m_completedClients.remove(sheet);
578 m_loadingClients.add(sheet);
579 }
580
removeSheetFromCache(Document * document)581 void StyleSheetContents::removeSheetFromCache(Document* document)
582 {
583 ASSERT(document);
584 document->styleEngine()->removeSheet(this);
585 }
586
addedToMemoryCache()587 void StyleSheetContents::addedToMemoryCache()
588 {
589 ASSERT(!m_isInMemoryCache);
590 ASSERT(isCacheable());
591 m_isInMemoryCache = true;
592 }
593
removedFromMemoryCache()594 void StyleSheetContents::removedFromMemoryCache()
595 {
596 ASSERT(m_isInMemoryCache);
597 ASSERT(isCacheable());
598 m_isInMemoryCache = false;
599 }
600
shrinkToFit()601 void StyleSheetContents::shrinkToFit()
602 {
603 m_importRules.shrinkToFit();
604 m_childRules.shrinkToFit();
605 }
606
ensureRuleSet(const MediaQueryEvaluator & medium,AddRuleFlags addRuleFlags)607 RuleSet& StyleSheetContents::ensureRuleSet(const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
608 {
609 if (!m_ruleSet) {
610 m_ruleSet = RuleSet::create();
611 m_ruleSet->addRulesFromSheet(this, medium, addRuleFlags);
612 }
613 return *m_ruleSet.get();
614 }
615
clearResolvers(WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet>> & clients)616 static void clearResolvers(WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> >& clients)
617 {
618 for (WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> >::iterator it = clients.begin(); it != clients.end(); ++it) {
619 if (Document* document = (*it)->ownerDocument())
620 document->styleEngine()->clearResolver();
621 }
622 }
623
clearRuleSet()624 void StyleSheetContents::clearRuleSet()
625 {
626 if (StyleSheetContents* parentSheet = parentStyleSheet())
627 parentSheet->clearRuleSet();
628
629 // Don't want to clear the StyleResolver if the RuleSet hasn't been created
630 // since we only clear the StyleResolver so that it's members are properly
631 // updated in ScopedStyleResolver::addRulesFromSheet.
632 if (!m_ruleSet)
633 return;
634
635 // Clearing the ruleSet means we need to recreate the styleResolver data structures.
636 // See the StyleResolver calls in ScopedStyleResolver::addRulesFromSheet.
637 clearResolvers(m_loadingClients);
638 clearResolvers(m_completedClients);
639 m_ruleSet.clear();
640 }
641
removeFontFaceRules(WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet>> & clients,const StyleRuleFontFace * fontFaceRule)642 static void removeFontFaceRules(WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> >& clients, const StyleRuleFontFace* fontFaceRule)
643 {
644 for (WillBeHeapHashSet<RawPtrWillBeWeakMember<CSSStyleSheet> >::iterator it = clients.begin(); it != clients.end(); ++it) {
645 if (Node* ownerNode = (*it)->ownerNode())
646 ownerNode->document().styleEngine()->removeFontFaceRules(WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> >(1, fontFaceRule));
647 }
648 }
649
notifyRemoveFontFaceRule(const StyleRuleFontFace * fontFaceRule)650 void StyleSheetContents::notifyRemoveFontFaceRule(const StyleRuleFontFace* fontFaceRule)
651 {
652 StyleSheetContents* root = rootStyleSheet();
653 removeFontFaceRules(root->m_loadingClients, fontFaceRule);
654 removeFontFaceRules(root->m_completedClients, fontFaceRule);
655 }
656
findFontFaceRulesFromRules(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase>> & rules,WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace>> & fontFaceRules)657 static void findFontFaceRulesFromRules(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& rules, WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> >& fontFaceRules)
658 {
659 for (unsigned i = 0; i < rules.size(); ++i) {
660 StyleRuleBase* rule = rules[i].get();
661
662 if (rule->isFontFaceRule()) {
663 fontFaceRules.append(toStyleRuleFontFace(rule));
664 } else if (rule->isMediaRule()) {
665 StyleRuleMedia* mediaRule = toStyleRuleMedia(rule);
666 // We cannot know whether the media rule matches or not, but
667 // for safety, remove @font-face in the media rule (if exists).
668 findFontFaceRulesFromRules(mediaRule->childRules(), fontFaceRules);
669 }
670 }
671 }
672
findFontFaceRules(WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace>> & fontFaceRules)673 void StyleSheetContents::findFontFaceRules(WillBeHeapVector<RawPtrWillBeMember<const StyleRuleFontFace> >& fontFaceRules)
674 {
675 for (unsigned i = 0; i < m_importRules.size(); ++i) {
676 if (!m_importRules[i]->styleSheet())
677 continue;
678 m_importRules[i]->styleSheet()->findFontFaceRules(fontFaceRules);
679 }
680
681 findFontFaceRulesFromRules(childRules(), fontFaceRules);
682 }
683
trace(Visitor * visitor)684 void StyleSheetContents::trace(Visitor* visitor)
685 {
686 #if ENABLE(OILPAN)
687 visitor->trace(m_ownerRule);
688 visitor->trace(m_importRules);
689 visitor->trace(m_childRules);
690 visitor->trace(m_loadingClients);
691 visitor->trace(m_completedClients);
692 visitor->trace(m_ruleSet);
693 #endif
694 }
695
696 }
697