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 "HTMLNames.h"
33 #include "RuntimeEnabledFeatures.h"
34 #include "core/css/CSSFontSelector.h"
35 #include "core/css/CSSSelector.h"
36 #include "core/css/CSSSelectorList.h"
37 #include "core/css/SelectorChecker.h"
38 #include "core/css/SelectorCheckerFastPath.h"
39 #include "core/css/SelectorFilter.h"
40 #include "core/css/StyleRuleImport.h"
41 #include "core/css/StyleSheetContents.h"
42 #include "core/html/track/TextTrackCue.h"
43 #include "platform/weborigin/SecurityOrigin.h"
44
45 namespace WebCore {
46
47 using namespace HTMLNames;
48
49 // -----------------------------------------------------------------
50
isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector * selector)51 static inline bool isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector* selector)
52 {
53 ASSERT(selector);
54 if (selector->m_match == CSSSelector::Tag) {
55 const AtomicString& selectorNamespace = selector->tagQName().namespaceURI();
56 if (selectorNamespace != starAtom && selectorNamespace != xhtmlNamespaceURI)
57 return false;
58 if (selector->relation() == CSSSelector::SubSelector)
59 return isSelectorMatchingHTMLBasedOnRuleHash(selector->tagHistory());
60 return true;
61 }
62 if (SelectorChecker::isCommonPseudoClassSelector(selector))
63 return true;
64 return selector->m_match == CSSSelector::Id || selector->m_match == CSSSelector::Class;
65 }
66
selectorListContainsUncommonAttributeSelector(const CSSSelector * selector)67 static inline bool selectorListContainsUncommonAttributeSelector(const CSSSelector* selector)
68 {
69 const CSSSelectorList* selectorList = selector->selectorList();
70 if (!selectorList)
71 return false;
72 for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(selector)) {
73 for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
74 if (component->isAttributeSelector())
75 return true;
76 }
77 }
78 return false;
79 }
80
isCommonAttributeSelectorAttribute(const QualifiedName & attribute)81 static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
82 {
83 // These are explicitly tested for equality in canShareStyleWithElement.
84 return attribute == typeAttr || attribute == readonlyAttr;
85 }
86
containsUncommonAttributeSelector(const CSSSelector * selector)87 static inline bool containsUncommonAttributeSelector(const CSSSelector* selector)
88 {
89 for (; selector; selector = selector->tagHistory()) {
90 // Allow certain common attributes (used in the default style) in the selectors that match the current element.
91 if (selector->isAttributeSelector() && !isCommonAttributeSelectorAttribute(selector->attribute()))
92 return true;
93 if (selectorListContainsUncommonAttributeSelector(selector))
94 return true;
95 if (selector->relation() != CSSSelector::SubSelector) {
96 selector = selector->tagHistory();
97 break;
98 }
99 }
100
101 for (; selector; selector = selector->tagHistory()) {
102 if (selector->isAttributeSelector())
103 return true;
104 if (selectorListContainsUncommonAttributeSelector(selector))
105 return true;
106 }
107 return false;
108 }
109
determinePropertyWhitelistType(const AddRuleFlags addRuleFlags,const CSSSelector * selector)110 static inline PropertyWhitelistType determinePropertyWhitelistType(const AddRuleFlags addRuleFlags, const CSSSelector* selector)
111 {
112 if (addRuleFlags & RuleIsInRegionRule)
113 return PropertyWhitelistRegion;
114 for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
115 if (component->pseudoType() == CSSSelector::PseudoCue || (component->m_match == CSSSelector::PseudoElement && component->value() == TextTrackCue::cueShadowPseudoId()))
116 return PropertyWhitelistCue;
117 }
118 return PropertyWhitelistNone;
119 }
120
121 namespace {
122
123 // FIXME: Should we move this class to WTF?
124 template<typename T>
125 class TerminatedArrayBuilder {
126 public:
TerminatedArrayBuilder(PassOwnPtr<T> array)127 explicit TerminatedArrayBuilder(PassOwnPtr<T> array)
128 : m_array(array)
129 , m_count(0)
130 , m_capacity(0)
131 {
132 if (!m_array)
133 return;
134 for (T* item = m_array.get(); !item->isLastInArray(); ++item)
135 ++m_count;
136 ++m_count; // To count the last item itself.
137 m_capacity = m_count;
138 }
139
grow(size_t count)140 void grow(size_t count)
141 {
142 ASSERT(count);
143 if (!m_array) {
144 ASSERT(!m_count);
145 ASSERT(!m_capacity);
146 m_capacity = count;
147 m_array = adoptPtr(static_cast<T*>(fastMalloc(m_capacity * sizeof(T))));
148 return;
149 }
150 m_capacity += count;
151 m_array = adoptPtr(static_cast<T*>(fastRealloc(m_array.leakPtr(), m_capacity * sizeof(T))));
152 m_array.get()[m_count - 1].setLastInArray(false);
153 }
154
append(const T & item)155 void append(const T& item)
156 {
157 RELEASE_ASSERT(m_count < m_capacity);
158 ASSERT(!item.isLastInArray());
159 m_array.get()[m_count++] = item;
160 }
161
release()162 PassOwnPtr<T> release()
163 {
164 RELEASE_ASSERT(m_count == m_capacity);
165 if (m_array)
166 m_array.get()[m_count - 1].setLastInArray(true);
167 assertValid();
168 return m_array.release();
169 }
170
171 private:
172 #ifndef NDEBUG
assertValid()173 void assertValid()
174 {
175 for (size_t i = 0; i < m_count; ++i) {
176 bool isLastInArray = (i + 1 == m_count);
177 ASSERT(m_array.get()[i].isLastInArray() == isLastInArray);
178 }
179 }
180 #else
181 void assertValid() { }
182 #endif
183
184 OwnPtr<T> m_array;
185 size_t m_count;
186 size_t m_capacity;
187 };
188
189 }
190
RuleData(StyleRule * rule,unsigned selectorIndex,unsigned position,AddRuleFlags addRuleFlags)191 RuleData::RuleData(StyleRule* rule, unsigned selectorIndex, unsigned position, AddRuleFlags addRuleFlags)
192 : m_rule(rule)
193 , m_selectorIndex(selectorIndex)
194 , m_isLastInArray(false)
195 , m_position(position)
196 , m_hasFastCheckableSelector((addRuleFlags & RuleCanUseFastCheckSelector) && SelectorCheckerFastPath::canUse(selector()))
197 , m_specificity(selector()->specificity())
198 , m_hasMultipartSelector(!!selector()->tagHistory())
199 , m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash(isSelectorMatchingHTMLBasedOnRuleHash(selector()))
200 , m_containsUncommonAttributeSelector(WebCore::containsUncommonAttributeSelector(selector()))
201 , m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
202 , m_hasDocumentSecurityOrigin(addRuleFlags & RuleHasDocumentSecurityOrigin)
203 , m_propertyWhitelistType(determinePropertyWhitelistType(addRuleFlags, selector()))
204 {
205 ASSERT(m_position == position);
206 ASSERT(m_selectorIndex == selectorIndex);
207 SelectorFilter::collectIdentifierHashes(selector(), m_descendantSelectorIdentifierHashes, maximumIdentifierCount);
208 }
209
collectFeaturesFromRuleData(RuleFeatureSet & features,const RuleData & ruleData)210 static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData& ruleData)
211 {
212 bool foundSiblingSelector = false;
213 unsigned maxDirectAdjacentSelectors = 0;
214 for (const CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) {
215 features.collectFeaturesFromSelector(selector);
216
217 if (const CSSSelectorList* selectorList = selector->selectorList()) {
218 for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
219 // FIXME: Shouldn't this be checking subSelector->isSiblingSelector()?
220 if (!foundSiblingSelector && selector->isSiblingSelector())
221 foundSiblingSelector = true;
222 if (subSelector->isDirectAdjacentSelector())
223 maxDirectAdjacentSelectors++;
224 features.collectFeaturesFromSelector(subSelector);
225 }
226 } else {
227 if (!foundSiblingSelector && selector->isSiblingSelector())
228 foundSiblingSelector = true;
229 if (selector->isDirectAdjacentSelector())
230 maxDirectAdjacentSelectors++;
231 }
232 }
233 features.setMaxDirectAdjacentSelectors(maxDirectAdjacentSelectors);
234 if (foundSiblingSelector)
235 features.siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
236 if (ruleData.containsUncommonAttributeSelector())
237 features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
238 }
239
addToRuleSet(StringImpl * key,PendingRuleMap & map,const RuleData & ruleData)240 void RuleSet::addToRuleSet(StringImpl* key, PendingRuleMap& map, const RuleData& ruleData)
241 {
242 if (!key)
243 return;
244 OwnPtr<LinkedStack<RuleData> >& rules = map.add(key, nullptr).iterator->value;
245 if (!rules)
246 rules = adoptPtr(new LinkedStack<RuleData>);
247 rules->push(ruleData);
248 }
249
findBestRuleSetAndAdd(const CSSSelector * component,RuleData & ruleData)250 bool RuleSet::findBestRuleSetAndAdd(const CSSSelector* component, RuleData& ruleData)
251 {
252 if (component->m_match == CSSSelector::Id) {
253 addToRuleSet(component->value().impl(), ensurePendingRules()->idRules, ruleData);
254 return true;
255 }
256 if (component->m_match == CSSSelector::Class) {
257 addToRuleSet(component->value().impl(), ensurePendingRules()->classRules, ruleData);
258 return true;
259 }
260 if (component->isCustomPseudoElement()) {
261 addToRuleSet(component->value().impl(), ensurePendingRules()->shadowPseudoElementRules, ruleData);
262 return true;
263 }
264 if (component->pseudoType() == CSSSelector::PseudoCue) {
265 m_cuePseudoRules.append(ruleData);
266 return true;
267 }
268 if (SelectorChecker::isCommonPseudoClassSelector(component)) {
269 switch (component->pseudoType()) {
270 case CSSSelector::PseudoLink:
271 case CSSSelector::PseudoVisited:
272 case CSSSelector::PseudoAnyLink:
273 m_linkPseudoClassRules.append(ruleData);
274 return true;
275 case CSSSelector::PseudoFocus:
276 m_focusPseudoClassRules.append(ruleData);
277 return true;
278 default:
279 ASSERT_NOT_REACHED();
280 return true;
281 }
282 }
283
284 if (component->m_match == CSSSelector::Tag) {
285 if (component->tagQName().localName() != starAtom) {
286 // If this is part of a subselector chain, recurse ahead to find a narrower set (ID/class.)
287 if (component->relation() == CSSSelector::SubSelector
288 && (component->tagHistory()->m_match == CSSSelector::Class || component->tagHistory()->m_match == CSSSelector::Id || SelectorChecker::isCommonPseudoClassSelector(component->tagHistory()))
289 && findBestRuleSetAndAdd(component->tagHistory(), ruleData))
290 return true;
291
292 addToRuleSet(component->tagQName().localName().impl(), ensurePendingRules()->tagRules, ruleData);
293 return true;
294 }
295 }
296 return false;
297 }
298
addRule(StyleRule * rule,unsigned selectorIndex,AddRuleFlags addRuleFlags)299 void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, AddRuleFlags addRuleFlags)
300 {
301 RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags);
302 collectFeaturesFromRuleData(m_features, ruleData);
303
304 if (!findBestRuleSetAndAdd(ruleData.selector(), ruleData)) {
305 // If we didn't find a specialized map to stick it in, file under universal rules.
306 m_universalRules.append(ruleData);
307 }
308 }
309
addPageRule(StyleRulePage * rule)310 void RuleSet::addPageRule(StyleRulePage* rule)
311 {
312 ensurePendingRules(); // So that m_pageRules.shrinkToFit() gets called.
313 m_pageRules.append(rule);
314 }
315
addViewportRule(StyleRuleViewport * rule)316 void RuleSet::addViewportRule(StyleRuleViewport* rule)
317 {
318 ensurePendingRules(); // So that m_viewportRules.shrinkToFit() gets called.
319 m_viewportRules.append(rule);
320 }
321
addFontFaceRule(StyleRuleFontFace * rule)322 void RuleSet::addFontFaceRule(StyleRuleFontFace* rule)
323 {
324 ensurePendingRules(); // So that m_fontFaceRules.shrinkToFit() gets called.
325 m_fontFaceRules.append(rule);
326 }
327
addKeyframesRule(StyleRuleKeyframes * rule)328 void RuleSet::addKeyframesRule(StyleRuleKeyframes* rule)
329 {
330 ensurePendingRules(); // So that m_keyframesRules.shrinkToFit() gets called.
331 m_keyframesRules.append(rule);
332 }
333
addRegionRule(StyleRuleRegion * regionRule,bool hasDocumentSecurityOrigin)334 void RuleSet::addRegionRule(StyleRuleRegion* regionRule, bool hasDocumentSecurityOrigin)
335 {
336 ensurePendingRules(); // So that m_regionSelectorsAndRuleSets.shrinkToFit() gets called.
337 OwnPtr<RuleSet> regionRuleSet = RuleSet::create();
338 // The region rule set should take into account the position inside the parent rule set.
339 // Otherwise, the rules inside region block might be incorrectly positioned before other similar rules from
340 // the stylesheet that contains the region block.
341 regionRuleSet->m_ruleCount = m_ruleCount;
342
343 // Collect the region rules into a rule set
344 // FIXME: Should this add other types of rules? (i.e. use addChildRules() directly?)
345 const Vector<RefPtr<StyleRuleBase> >& childRules = regionRule->childRules();
346 AddRuleFlags addRuleFlags = hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
347 addRuleFlags = static_cast<AddRuleFlags>(addRuleFlags | RuleIsInRegionRule | RuleCanUseFastCheckSelector);
348 for (unsigned i = 0; i < childRules.size(); ++i) {
349 StyleRuleBase* regionStylingRule = childRules[i].get();
350 if (regionStylingRule->isStyleRule())
351 regionRuleSet->addStyleRule(toStyleRule(regionStylingRule), addRuleFlags);
352 }
353 // Update the "global" rule count so that proper order is maintained
354 m_ruleCount = regionRuleSet->m_ruleCount;
355
356 m_regionSelectorsAndRuleSets.append(RuleSetSelectorPair(regionRule->selectorList().first(), regionRuleSet.release()));
357 }
358
addChildRules(const Vector<RefPtr<StyleRuleBase>> & rules,const MediaQueryEvaluator & medium,AddRuleFlags addRuleFlags)359 void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase> >& rules, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
360 {
361 for (unsigned i = 0; i < rules.size(); ++i) {
362 StyleRuleBase* rule = rules[i].get();
363
364 if (rule->isStyleRule()) {
365 StyleRule* styleRule = toStyleRule(rule);
366
367 const CSSSelectorList& selectorList = styleRule->selectorList();
368 for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
369 if (selectorList.hasCombinatorCrossingTreeBoundaryAt(selectorIndex)) {
370 m_treeBoundaryCrossingRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
371 } else if (selectorList.hasShadowDistributedAt(selectorIndex)) {
372 m_shadowDistributedRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
373 } else {
374 addRule(styleRule, selectorIndex, addRuleFlags);
375 }
376 }
377 } else if (rule->isPageRule()) {
378 addPageRule(toStyleRulePage(rule));
379 } else if (rule->isMediaRule()) {
380 StyleRuleMedia* mediaRule = toStyleRuleMedia(rule);
381 if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), &m_viewportDependentMediaQueryResults)))
382 addChildRules(mediaRule->childRules(), medium, addRuleFlags);
383 } else if (rule->isFontFaceRule()) {
384 addFontFaceRule(toStyleRuleFontFace(rule));
385 } else if (rule->isKeyframesRule()) {
386 addKeyframesRule(toStyleRuleKeyframes(rule));
387 } else if (rule->isRegionRule()) {
388 addRegionRule(toStyleRuleRegion(rule), addRuleFlags & RuleHasDocumentSecurityOrigin);
389 } else if (rule->isViewportRule()) {
390 addViewportRule(toStyleRuleViewport(rule));
391 } else if (rule->isSupportsRule() && toStyleRuleSupports(rule)->conditionIsSupported()) {
392 addChildRules(toStyleRuleSupports(rule)->childRules(), medium, addRuleFlags);
393 }
394 }
395 }
396
addRulesFromSheet(StyleSheetContents * sheet,const MediaQueryEvaluator & medium,AddRuleFlags addRuleFlags)397 void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
398 {
399 ASSERT(sheet);
400
401 addRuleFlags = static_cast<AddRuleFlags>(addRuleFlags | RuleCanUseFastCheckSelector);
402 const Vector<RefPtr<StyleRuleImport> >& importRules = sheet->importRules();
403 for (unsigned i = 0; i < importRules.size(); ++i) {
404 StyleRuleImport* importRule = importRules[i].get();
405 if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), &m_viewportDependentMediaQueryResults)))
406 addRulesFromSheet(importRule->styleSheet(), medium, addRuleFlags);
407 }
408
409 addChildRules(sheet->childRules(), medium, addRuleFlags);
410 }
411
addStyleRule(StyleRule * rule,AddRuleFlags addRuleFlags)412 void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags)
413 {
414 for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
415 addRule(rule, selectorIndex, addRuleFlags);
416 }
417
compactPendingRules(PendingRuleMap & pendingMap,CompactRuleMap & compactMap)418 void RuleSet::compactPendingRules(PendingRuleMap& pendingMap, CompactRuleMap& compactMap)
419 {
420 PendingRuleMap::iterator end = pendingMap.end();
421 for (PendingRuleMap::iterator it = pendingMap.begin(); it != end; ++it) {
422 OwnPtr<LinkedStack<RuleData> > pendingRules = it->value.release();
423 CompactRuleMap::iterator compactRules = compactMap.add(it->key, nullptr).iterator;
424
425 TerminatedArrayBuilder<RuleData> builder(compactRules->value.release());
426 builder.grow(pendingRules->size());
427 while (!pendingRules->isEmpty()) {
428 builder.append(pendingRules->peek());
429 pendingRules->pop();
430 }
431
432 compactRules->value = builder.release();
433 }
434 }
435
compactRules()436 void RuleSet::compactRules()
437 {
438 ASSERT(m_pendingRules);
439 OwnPtr<PendingRuleMaps> pendingRules = m_pendingRules.release();
440 compactPendingRules(pendingRules->idRules, m_idRules);
441 compactPendingRules(pendingRules->classRules, m_classRules);
442 compactPendingRules(pendingRules->tagRules, m_tagRules);
443 compactPendingRules(pendingRules->shadowPseudoElementRules, m_shadowPseudoElementRules);
444 m_linkPseudoClassRules.shrinkToFit();
445 m_cuePseudoRules.shrinkToFit();
446 m_focusPseudoClassRules.shrinkToFit();
447 m_universalRules.shrinkToFit();
448 m_pageRules.shrinkToFit();
449 m_viewportRules.shrinkToFit();
450 m_fontFaceRules.shrinkToFit();
451 m_keyframesRules.shrinkToFit();
452 m_treeBoundaryCrossingRules.shrinkToFit();
453 m_shadowDistributedRules.shrinkToFit();
454 }
455
456 } // namespace WebCore
457