1 /*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
5 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
6 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
7 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
8 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
9 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
10 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
11 * Copyright (C) 2012 Google Inc. All rights reserved.
12 *
13 * This library is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Library General Public
15 * License as published by the Free Software Foundation; either
16 * version 2 of the License, or (at your option) any later version.
17 *
18 * This library is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Library General Public License for more details.
22 *
23 * You should have received a copy of the GNU Library General Public License
24 * along with this library; see the file COPYING.LIB. If not, write to
25 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 * Boston, MA 02110-1301, USA.
27 */
28
29 #include "config.h"
30 #include "core/css/RuleSet.h"
31
32 #include "core/HTMLNames.h"
33 #include "core/css/CSSFontSelector.h"
34 #include "core/css/CSSSelector.h"
35 #include "core/css/CSSSelectorList.h"
36 #include "core/css/SelectorChecker.h"
37 #include "core/css/SelectorFilter.h"
38 #include "core/css/StyleRuleImport.h"
39 #include "core/css/StyleSheetContents.h"
40 #include "core/html/track/TextTrackCue.h"
41 #include "platform/RuntimeEnabledFeatures.h"
42 #include "platform/TraceEvent.h"
43 #include "platform/heap/HeapTerminatedArrayBuilder.h"
44 #include "platform/weborigin/SecurityOrigin.h"
45
46 #include "wtf/TerminatedArrayBuilder.h"
47
48 namespace WebCore {
49
50 using namespace HTMLNames;
51
52 // -----------------------------------------------------------------
53
isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector & selector)54 static inline bool isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector& selector)
55 {
56 if (selector.match() == CSSSelector::Tag) {
57 const AtomicString& selectorNamespace = selector.tagQName().namespaceURI();
58 if (selectorNamespace != starAtom && selectorNamespace != xhtmlNamespaceURI)
59 return false;
60 if (selector.relation() == CSSSelector::SubSelector) {
61 ASSERT(selector.tagHistory());
62 return isSelectorMatchingHTMLBasedOnRuleHash(*selector.tagHistory());
63 }
64 return true;
65 }
66 if (SelectorChecker::isCommonPseudoClassSelector(selector))
67 return true;
68 return selector.match() == CSSSelector::Id || selector.match() == CSSSelector::Class;
69 }
70
selectorListContainsUncommonAttributeSelector(const CSSSelector * selector)71 static inline bool selectorListContainsUncommonAttributeSelector(const CSSSelector* selector)
72 {
73 const CSSSelectorList* selectorList = selector->selectorList();
74 if (!selectorList)
75 return false;
76 for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(*selector)) {
77 for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
78 if (component->isAttributeSelector())
79 return true;
80 }
81 }
82 return false;
83 }
84
isCommonAttributeSelectorAttribute(const QualifiedName & attribute)85 static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
86 {
87 // These are explicitly tested for equality in canShareStyleWithElement.
88 return attribute == typeAttr || attribute == readonlyAttr;
89 }
90
containsUncommonAttributeSelector(const CSSSelector & selector)91 static inline bool containsUncommonAttributeSelector(const CSSSelector& selector)
92 {
93 const CSSSelector* current = &selector;
94 for (; current; current = current->tagHistory()) {
95 // Allow certain common attributes (used in the default style) in the selectors that match the current element.
96 if (current->isAttributeSelector() && !isCommonAttributeSelectorAttribute(current->attribute()))
97 return true;
98 if (selectorListContainsUncommonAttributeSelector(current))
99 return true;
100 if (current->relation() != CSSSelector::SubSelector) {
101 current = current->tagHistory();
102 break;
103 }
104 }
105
106 for (; current; current = current->tagHistory()) {
107 if (current->isAttributeSelector())
108 return true;
109 if (selectorListContainsUncommonAttributeSelector(current))
110 return true;
111 }
112 return false;
113 }
114
determinePropertyWhitelistType(const AddRuleFlags addRuleFlags,const CSSSelector & selector)115 static inline PropertyWhitelistType determinePropertyWhitelistType(const AddRuleFlags addRuleFlags, const CSSSelector& selector)
116 {
117 for (const CSSSelector* component = &selector; component; component = component->tagHistory()) {
118 if (component->pseudoType() == CSSSelector::PseudoCue || (component->match() == CSSSelector::PseudoElement && component->value() == TextTrackCue::cueShadowPseudoId()))
119 return PropertyWhitelistCue;
120 if (component->pseudoType() == CSSSelector::PseudoFirstLetter)
121 return PropertyWhitelistFirstLetter;
122 }
123 return PropertyWhitelistNone;
124 }
125
RuleData(StyleRule * rule,unsigned selectorIndex,unsigned position,AddRuleFlags addRuleFlags)126 RuleData::RuleData(StyleRule* rule, unsigned selectorIndex, unsigned position, AddRuleFlags addRuleFlags)
127 : m_rule(rule)
128 , m_selectorIndex(selectorIndex)
129 , m_isLastInArray(false)
130 , m_position(position)
131 , m_specificity(selector().specificity())
132 , m_hasMultipartSelector(!!selector().tagHistory())
133 , m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash(isSelectorMatchingHTMLBasedOnRuleHash(selector()))
134 , m_containsUncommonAttributeSelector(WebCore::containsUncommonAttributeSelector(selector()))
135 , m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
136 , m_hasDocumentSecurityOrigin(addRuleFlags & RuleHasDocumentSecurityOrigin)
137 , m_propertyWhitelistType(determinePropertyWhitelistType(addRuleFlags, selector()))
138 {
139 ASSERT(m_position == position);
140 ASSERT(m_selectorIndex == selectorIndex);
141 SelectorFilter::collectIdentifierHashes(selector(), m_descendantSelectorIdentifierHashes, maximumIdentifierCount);
142 }
143
addToRuleSet(const AtomicString & key,PendingRuleMap & map,const RuleData & ruleData)144 void RuleSet::addToRuleSet(const AtomicString& key, PendingRuleMap& map, const RuleData& ruleData)
145 {
146 OwnPtrWillBeMember<WillBeHeapLinkedStack<RuleData> >& rules = map.add(key, nullptr).storedValue->value;
147 if (!rules)
148 rules = adoptPtrWillBeNoop(new WillBeHeapLinkedStack<RuleData>);
149 rules->push(ruleData);
150 }
151
extractValuesforSelector(const CSSSelector * selector,AtomicString & id,AtomicString & className,AtomicString & customPseudoElementName,AtomicString & tagName)152 static void extractValuesforSelector(const CSSSelector* selector, AtomicString& id, AtomicString& className, AtomicString& customPseudoElementName, AtomicString& tagName)
153 {
154 switch (selector->match()) {
155 case CSSSelector::Id:
156 id = selector->value();
157 break;
158 case CSSSelector::Class:
159 className = selector->value();
160 break;
161 case CSSSelector::Tag:
162 if (selector->tagQName().localName() != starAtom)
163 tagName = selector->tagQName().localName();
164 break;
165 default:
166 break;
167 }
168 if (selector->isCustomPseudoElement())
169 customPseudoElementName = selector->value();
170 }
171
findBestRuleSetAndAdd(const CSSSelector & component,RuleData & ruleData)172 bool RuleSet::findBestRuleSetAndAdd(const CSSSelector& component, RuleData& ruleData)
173 {
174 AtomicString id;
175 AtomicString className;
176 AtomicString customPseudoElementName;
177 AtomicString tagName;
178
179 #ifndef NDEBUG
180 m_allRules.append(ruleData);
181 #endif
182
183 const CSSSelector* it = &component;
184 for (; it && it->relation() == CSSSelector::SubSelector; it = it->tagHistory()) {
185 extractValuesforSelector(it, id, className, customPseudoElementName, tagName);
186 }
187 // FIXME: this null check should not be necessary. See crbug.com/358475
188 if (it)
189 extractValuesforSelector(it, id, className, customPseudoElementName, tagName);
190
191 // Prefer rule sets in order of most likely to apply infrequently.
192 if (!id.isEmpty()) {
193 addToRuleSet(id, ensurePendingRules()->idRules, ruleData);
194 return true;
195 }
196 if (!className.isEmpty()) {
197 addToRuleSet(className, ensurePendingRules()->classRules, ruleData);
198 return true;
199 }
200 if (!customPseudoElementName.isEmpty()) {
201 // Custom pseudos come before ids and classes in the order of tagHistory, and have a relation of
202 // ShadowPseudo between them. Therefore we should never be a situation where extractValuesforSelector
203 // finsd id and className in addition to custom pseudo.
204 ASSERT(id.isEmpty() && className.isEmpty());
205 addToRuleSet(customPseudoElementName, ensurePendingRules()->shadowPseudoElementRules, ruleData);
206 return true;
207 }
208
209 if (component.pseudoType() == CSSSelector::PseudoCue) {
210 m_cuePseudoRules.append(ruleData);
211 return true;
212 }
213
214 if (SelectorChecker::isCommonPseudoClassSelector(component)) {
215 switch (component.pseudoType()) {
216 case CSSSelector::PseudoLink:
217 case CSSSelector::PseudoVisited:
218 case CSSSelector::PseudoAnyLink:
219 m_linkPseudoClassRules.append(ruleData);
220 return true;
221 case CSSSelector::PseudoFocus:
222 m_focusPseudoClassRules.append(ruleData);
223 return true;
224 default:
225 ASSERT_NOT_REACHED();
226 return true;
227 }
228 }
229
230 if (!tagName.isEmpty()) {
231 addToRuleSet(tagName, ensurePendingRules()->tagRules, ruleData);
232 return true;
233 }
234
235 return false;
236 }
237
addRule(StyleRule * rule,unsigned selectorIndex,AddRuleFlags addRuleFlags)238 void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, AddRuleFlags addRuleFlags)
239 {
240 RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags);
241 m_features.collectFeaturesFromRuleData(ruleData);
242
243 if (!findBestRuleSetAndAdd(ruleData.selector(), ruleData)) {
244 // If we didn't find a specialized map to stick it in, file under universal rules.
245 m_universalRules.append(ruleData);
246 }
247 }
248
addPageRule(StyleRulePage * rule)249 void RuleSet::addPageRule(StyleRulePage* rule)
250 {
251 ensurePendingRules(); // So that m_pageRules.shrinkToFit() gets called.
252 m_pageRules.append(rule);
253 }
254
addViewportRule(StyleRuleViewport * rule)255 void RuleSet::addViewportRule(StyleRuleViewport* rule)
256 {
257 ensurePendingRules(); // So that m_viewportRules.shrinkToFit() gets called.
258 m_viewportRules.append(rule);
259 }
260
addFontFaceRule(StyleRuleFontFace * rule)261 void RuleSet::addFontFaceRule(StyleRuleFontFace* rule)
262 {
263 ensurePendingRules(); // So that m_fontFaceRules.shrinkToFit() gets called.
264 m_fontFaceRules.append(rule);
265 }
266
addKeyframesRule(StyleRuleKeyframes * rule)267 void RuleSet::addKeyframesRule(StyleRuleKeyframes* rule)
268 {
269 ensurePendingRules(); // So that m_keyframesRules.shrinkToFit() gets called.
270 m_keyframesRules.append(rule);
271 }
272
addChildRules(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase>> & rules,const MediaQueryEvaluator & medium,AddRuleFlags addRuleFlags)273 void RuleSet::addChildRules(const WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase> >& rules, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
274 {
275 for (unsigned i = 0; i < rules.size(); ++i) {
276 StyleRuleBase* rule = rules[i].get();
277
278 if (rule->isStyleRule()) {
279 StyleRule* styleRule = toStyleRule(rule);
280
281 const CSSSelectorList& selectorList = styleRule->selectorList();
282 for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
283 if (selectorList.selectorCrossesTreeScopes(selectorIndex)) {
284 m_treeBoundaryCrossingRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
285 } else if (selectorList.hasShadowDistributedAt(selectorIndex)) {
286 m_shadowDistributedRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
287 } else {
288 addRule(styleRule, selectorIndex, addRuleFlags);
289 }
290 }
291 } else if (rule->isPageRule()) {
292 addPageRule(toStyleRulePage(rule));
293 } else if (rule->isMediaRule()) {
294 StyleRuleMedia* mediaRule = toStyleRuleMedia(rule);
295 if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), &m_viewportDependentMediaQueryResults)))
296 addChildRules(mediaRule->childRules(), medium, addRuleFlags);
297 } else if (rule->isFontFaceRule()) {
298 addFontFaceRule(toStyleRuleFontFace(rule));
299 } else if (rule->isKeyframesRule()) {
300 addKeyframesRule(toStyleRuleKeyframes(rule));
301 } else if (rule->isViewportRule()) {
302 addViewportRule(toStyleRuleViewport(rule));
303 } else if (rule->isSupportsRule() && toStyleRuleSupports(rule)->conditionIsSupported()) {
304 addChildRules(toStyleRuleSupports(rule)->childRules(), medium, addRuleFlags);
305 }
306 }
307 }
308
addRulesFromSheet(StyleSheetContents * sheet,const MediaQueryEvaluator & medium,AddRuleFlags addRuleFlags)309 void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
310 {
311 TRACE_EVENT0("webkit", "RuleSet::addRulesFromSheet");
312
313 ASSERT(sheet);
314
315 addRuleFlags = static_cast<AddRuleFlags>(addRuleFlags | RuleCanUseFastCheckSelector);
316 const WillBeHeapVector<RefPtrWillBeMember<StyleRuleImport> >& importRules = sheet->importRules();
317 for (unsigned i = 0; i < importRules.size(); ++i) {
318 StyleRuleImport* importRule = importRules[i].get();
319 if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), &m_viewportDependentMediaQueryResults)))
320 addRulesFromSheet(importRule->styleSheet(), medium, addRuleFlags);
321 }
322
323 addChildRules(sheet->childRules(), medium, addRuleFlags);
324 }
325
addStyleRule(StyleRule * rule,AddRuleFlags addRuleFlags)326 void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags)
327 {
328 for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
329 addRule(rule, selectorIndex, addRuleFlags);
330 }
331
compactPendingRules(PendingRuleMap & pendingMap,CompactRuleMap & compactMap)332 void RuleSet::compactPendingRules(PendingRuleMap& pendingMap, CompactRuleMap& compactMap)
333 {
334 PendingRuleMap::iterator end = pendingMap.end();
335 for (PendingRuleMap::iterator it = pendingMap.begin(); it != end; ++it) {
336 OwnPtrWillBeRawPtr<WillBeHeapLinkedStack<RuleData> > pendingRules = it->value.release();
337 CompactRuleMap::ValueType* compactRules = compactMap.add(it->key, nullptr).storedValue;
338
339 WillBeHeapTerminatedArrayBuilder<RuleData> builder(compactRules->value.release());
340 builder.grow(pendingRules->size());
341 while (!pendingRules->isEmpty()) {
342 builder.append(pendingRules->peek());
343 pendingRules->pop();
344 }
345
346 compactRules->value = builder.release();
347 }
348 }
349
compactRules()350 void RuleSet::compactRules()
351 {
352 ASSERT(m_pendingRules);
353 OwnPtrWillBeRawPtr<PendingRuleMaps> pendingRules = m_pendingRules.release();
354 compactPendingRules(pendingRules->idRules, m_idRules);
355 compactPendingRules(pendingRules->classRules, m_classRules);
356 compactPendingRules(pendingRules->tagRules, m_tagRules);
357 compactPendingRules(pendingRules->shadowPseudoElementRules, m_shadowPseudoElementRules);
358 m_linkPseudoClassRules.shrinkToFit();
359 m_cuePseudoRules.shrinkToFit();
360 m_focusPseudoClassRules.shrinkToFit();
361 m_universalRules.shrinkToFit();
362 m_pageRules.shrinkToFit();
363 m_viewportRules.shrinkToFit();
364 m_fontFaceRules.shrinkToFit();
365 m_keyframesRules.shrinkToFit();
366 m_treeBoundaryCrossingRules.shrinkToFit();
367 m_shadowDistributedRules.shrinkToFit();
368 }
369
trace(Visitor * visitor)370 void MinimalRuleData::trace(Visitor* visitor)
371 {
372 visitor->trace(m_rule);
373 }
374
trace(Visitor * visitor)375 void RuleData::trace(Visitor* visitor)
376 {
377 visitor->trace(m_rule);
378 }
379
trace(Visitor * visitor)380 void RuleSet::PendingRuleMaps::trace(Visitor* visitor)
381 {
382 visitor->trace(idRules);
383 visitor->trace(classRules);
384 visitor->trace(tagRules);
385 visitor->trace(shadowPseudoElementRules);
386 }
387
trace(Visitor * visitor)388 void RuleSet::trace(Visitor* visitor)
389 {
390 #if ENABLE(OILPAN)
391 visitor->trace(m_idRules);
392 visitor->trace(m_classRules);
393 visitor->trace(m_tagRules);
394 visitor->trace(m_shadowPseudoElementRules);
395 visitor->trace(m_linkPseudoClassRules);
396 visitor->trace(m_cuePseudoRules);
397 visitor->trace(m_focusPseudoClassRules);
398 visitor->trace(m_universalRules);
399 visitor->trace(m_features);
400 visitor->trace(m_pageRules);
401 visitor->trace(m_viewportRules);
402 visitor->trace(m_fontFaceRules);
403 visitor->trace(m_keyframesRules);
404 visitor->trace(m_treeBoundaryCrossingRules);
405 visitor->trace(m_shadowDistributedRules);
406 visitor->trace(m_viewportDependentMediaQueryResults);
407 visitor->trace(m_pendingRules);
408 #ifndef NDEBUG
409 visitor->trace(m_allRules);
410 #endif
411 #endif
412 }
413
414 #ifndef NDEBUG
show()415 void RuleSet::show()
416 {
417 for (WillBeHeapVector<RuleData>::const_iterator it = m_allRules.begin(); it != m_allRules.end(); ++it)
418 it->selector().show();
419 }
420 #endif
421
422 } // namespace WebCore
423