1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 2004-2005 Allan Sandfeld Jensen (kde (at) carewolf.com) 4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit (at) 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 (at) webkit.org> 7 * Copyright (C) 2007, 2008 Eric Seidel <eric (at) 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 blink { 49 50 using namespace HTMLNames; 51 52 // ----------------------------------------------------------------- 53 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 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 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 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 } 114 115 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 } 125 126 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(blink::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 } 143 144 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 } 151 152 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 } 171 172 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 } 237 238 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 } 248 249 void RuleSet::addPageRule(StyleRulePage* rule) 250 { 251 ensurePendingRules(); // So that m_pageRules.shrinkToFit() gets called. 252 m_pageRules.append(rule); 253 } 254 255 void RuleSet::addViewportRule(StyleRuleViewport* rule) 256 { 257 ensurePendingRules(); // So that m_viewportRules.shrinkToFit() gets called. 258 m_viewportRules.append(rule); 259 } 260 261 void RuleSet::addFontFaceRule(StyleRuleFontFace* rule) 262 { 263 ensurePendingRules(); // So that m_fontFaceRules.shrinkToFit() gets called. 264 m_fontFaceRules.append(rule); 265 } 266 267 void RuleSet::addKeyframesRule(StyleRuleKeyframes* rule) 268 { 269 ensurePendingRules(); // So that m_keyframesRules.shrinkToFit() gets called. 270 m_keyframesRules.append(rule); 271 } 272 273 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 } 308 309 void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags) 310 { 311 TRACE_EVENT0("blink", "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 } 325 326 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 } 331 332 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 } 349 350 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 } 369 370 void MinimalRuleData::trace(Visitor* visitor) 371 { 372 visitor->trace(m_rule); 373 } 374 375 void RuleData::trace(Visitor* visitor) 376 { 377 visitor->trace(m_rule); 378 } 379 380 void RuleSet::PendingRuleMaps::trace(Visitor* visitor) 381 { 382 #if ENABLE(OILPAN) 383 visitor->trace(idRules); 384 visitor->trace(classRules); 385 visitor->trace(tagRules); 386 visitor->trace(shadowPseudoElementRules); 387 #endif 388 } 389 390 void RuleSet::trace(Visitor* visitor) 391 { 392 #if ENABLE(OILPAN) 393 visitor->trace(m_idRules); 394 visitor->trace(m_classRules); 395 visitor->trace(m_tagRules); 396 visitor->trace(m_shadowPseudoElementRules); 397 visitor->trace(m_linkPseudoClassRules); 398 visitor->trace(m_cuePseudoRules); 399 visitor->trace(m_focusPseudoClassRules); 400 visitor->trace(m_universalRules); 401 visitor->trace(m_features); 402 visitor->trace(m_pageRules); 403 visitor->trace(m_viewportRules); 404 visitor->trace(m_fontFaceRules); 405 visitor->trace(m_keyframesRules); 406 visitor->trace(m_treeBoundaryCrossingRules); 407 visitor->trace(m_shadowDistributedRules); 408 visitor->trace(m_viewportDependentMediaQueryResults); 409 visitor->trace(m_pendingRules); 410 #ifndef NDEBUG 411 visitor->trace(m_allRules); 412 #endif 413 #endif 414 } 415 416 #ifndef NDEBUG 417 void RuleSet::show() 418 { 419 for (WillBeHeapVector<RuleData>::const_iterator it = m_allRules.begin(); it != m_allRules.end(); ++it) 420 it->selector().show(); 421 } 422 #endif 423 424 } // namespace blink 425
