#include "config.h"
#include "RuleSet.h"
#include "CSSFontSelector.h"
#include "CSSSelector.h"
#include "CSSSelectorList.h"
#include "HTMLNames.h"
#include "MediaQueryEvaluator.h"
#include "SecurityOrigin.h"
#include "SelectorChecker.h"
#include "SelectorFilter.h"
#include "StyleResolver.h"
#include "StyleRule.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include "WebKitCSSKeyframesRule.h"
#if ENABLE(VIDEO_TRACK)
#include "TextTrackCue.h"
#endif
namespace WebCore {
using namespace HTMLNames;
static inline bool isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector& selector)
{
if (selector.tagHistory())
return false;
if (selector.m_match == CSSSelector::Tag) {
const AtomicString& selectorNamespace = selector.tagQName().namespaceURI();
return selectorNamespace == starAtom || selectorNamespace == xhtmlNamespaceURI;
}
if (SelectorChecker::isCommonPseudoClassSelector(&selector))
return true;
return selector.m_match == CSSSelector::Id || selector.m_match == CSSSelector::Class;
}
static bool selectorCanMatchPseudoElement(const CSSSelector& rootSelector)
{
const CSSSelector* selector = &rootSelector;
do {
if (selector->matchesPseudoElement())
return true;
if (const CSSSelectorList* selectorList = selector->selectorList()) {
for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
if (selectorCanMatchPseudoElement(*subSelector))
return true;
}
}
selector = selector->tagHistory();
} while (selector);
return false;
}
static inline bool selectorListContainsAttributeSelector(const CSSSelector* selector)
{
const CSSSelectorList* selectorList = selector->selectorList();
if (!selectorList)
return false;
for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(selector)) {
for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
if (component->isAttributeSelector())
return true;
}
}
return false;
}
static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
{
return attribute == typeAttr || attribute == readonlyAttr;
}
static inline bool containsUncommonAttributeSelector(const CSSSelector* selector)
{
for (; selector; selector = selector->tagHistory()) {
if (selector->isAttributeSelector() && !isCommonAttributeSelectorAttribute(selector->attribute()))
return true;
if (selectorListContainsAttributeSelector(selector))
return true;
if (selector->relation() != CSSSelector::SubSelector) {
selector = selector->tagHistory();
break;
}
}
for (; selector; selector = selector->tagHistory()) {
if (selector->isAttributeSelector())
return true;
if (selectorListContainsAttributeSelector(selector))
return true;
}
return false;
}
static inline PropertyWhitelistType determinePropertyWhitelistType(const AddRuleFlags addRuleFlags, const CSSSelector* selector)
{
if (addRuleFlags & RuleIsInRegionRule)
return PropertyWhitelistRegion;
#if ENABLE(VIDEO_TRACK)
for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
if (component->m_match == CSSSelector::PseudoElement && (component->pseudoElementType() == CSSSelector::PseudoElementCue || component->value() == TextTrackCue::cueShadowPseudoId()))
return PropertyWhitelistCue;
}
#else
UNUSED_PARAM(selector);
#endif
return PropertyWhitelistNone;
}
RuleData::RuleData(StyleRule* rule, unsigned selectorIndex, unsigned position, AddRuleFlags addRuleFlags)
: m_rule(rule)
, m_selectorIndex(selectorIndex)
, m_hasDocumentSecurityOrigin(addRuleFlags & RuleHasDocumentSecurityOrigin)
, m_position(position)
, m_specificity(selector()->specificity())
, m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash(isSelectorMatchingHTMLBasedOnRuleHash(*selector()))
, m_canMatchPseudoElement(selectorCanMatchPseudoElement(*selector()))
, m_containsUncommonAttributeSelector(WebCore::containsUncommonAttributeSelector(selector()))
, m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
, m_propertyWhitelistType(determinePropertyWhitelistType(addRuleFlags, selector()))
#if ENABLE(CSS_SELECTOR_JIT) && CSS_SELECTOR_JIT_PROFILING
, m_compiledSelectorUseCount(0)
#endif
{
ASSERT(m_position == position);
ASSERT(m_selectorIndex == selectorIndex);
SelectorFilter::collectIdentifierHashes(selector(), m_descendantSelectorIdentifierHashes, maximumIdentifierCount);
}
static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData& ruleData)
{
bool foundSiblingSelector = false;
for (const CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) {
features.collectFeaturesFromSelector(selector);
if (const CSSSelectorList* selectorList = selector->selectorList()) {
for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
if (!foundSiblingSelector && selector->isSiblingSelector())
foundSiblingSelector = true;
features.collectFeaturesFromSelector(subSelector);
}
} else if (!foundSiblingSelector && selector->isSiblingSelector())
foundSiblingSelector = true;
}
if (foundSiblingSelector)
features.siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
if (ruleData.containsUncommonAttributeSelector())
features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
}
void RuleSet::addToRuleSet(AtomicStringImpl* key, AtomRuleMap& map, const RuleData& ruleData)
{
if (!key)
return;
std::unique_ptr<Vector<RuleData>>& rules = map.add(key, nullptr).iterator->value;
if (!rules)
rules = std::make_unique<Vector<RuleData>>();
rules->append(ruleData);
}
static unsigned rulesCountForName(const RuleSet::AtomRuleMap& map, AtomicStringImpl* name)
{
if (const Vector<RuleData>* rules = map.get(name))
return rules->size();
return 0;
}
void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, AddRuleFlags addRuleFlags)
{
RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags);
collectFeaturesFromRuleData(m_features, ruleData);
unsigned classBucketSize = 0;
const CSSSelector* tagSelector = nullptr;
const CSSSelector* classSelector = nullptr;
const CSSSelector* linkSelector = nullptr;
const CSSSelector* focusSelector = nullptr;
const CSSSelector* selector = ruleData.selector();
do {
if (selector->m_match == CSSSelector::Id) {
addToRuleSet(selector->value().impl(), m_idRules, ruleData);
return;
}
#if ENABLE(VIDEO_TRACK)
if (selector->m_match == CSSSelector::PseudoElement && selector->pseudoElementType() == CSSSelector::PseudoElementCue) {
m_cuePseudoRules.append(ruleData);
return;
}
#endif
if (selector->isCustomPseudoElement()) {
addToRuleSet(selector->value().impl(), m_shadowPseudoElementRules, ruleData);
return;
}
if (selector->m_match == CSSSelector::Class) {
AtomicStringImpl* className = selector->value().impl();
if (!classSelector) {
classSelector = selector;
classBucketSize = rulesCountForName(m_classRules, className);
} else if (classBucketSize) {
unsigned newClassBucketSize = rulesCountForName(m_classRules, className);
if (newClassBucketSize < classBucketSize) {
classSelector = selector;
classBucketSize = newClassBucketSize;
}
}
}
if (selector->m_match == CSSSelector::Tag && selector->tagQName().localName() != starAtom)
tagSelector = selector;
if (SelectorChecker::isCommonPseudoClassSelector(selector)) {
switch (selector->pseudoClassType()) {
case CSSSelector::PseudoClassLink:
case CSSSelector::PseudoClassVisited:
case CSSSelector::PseudoClassAnyLink:
linkSelector = selector;
break;
case CSSSelector::PseudoClassFocus:
focusSelector = selector;
break;
default:
ASSERT_NOT_REACHED();
}
}
if (selector->relation() != CSSSelector::SubSelector)
break;
selector = selector->tagHistory();
} while (selector);
if (classSelector) {
addToRuleSet(classSelector->value().impl(), m_classRules, ruleData);
return;
}
if (linkSelector) {
m_linkPseudoClassRules.append(ruleData);
return;
}
if (focusSelector) {
m_focusPseudoClassRules.append(ruleData);
return;
}
if (tagSelector) {
addToRuleSet(tagSelector->tagQName().localName().impl(), m_tagRules, ruleData);
return;
}
m_universalRules.append(ruleData);
}
void RuleSet::addPageRule(StyleRulePage* rule)
{
m_pageRules.append(rule);
}
void RuleSet::addRegionRule(StyleRuleRegion* regionRule, bool hasDocumentSecurityOrigin)
{
auto regionRuleSet = std::make_unique<RuleSet>();
regionRuleSet->m_ruleCount = m_ruleCount;
const Vector<RefPtr<StyleRuleBase>>& childRules = regionRule->childRules();
AddRuleFlags addRuleFlags = hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
addRuleFlags = static_cast<AddRuleFlags>(addRuleFlags | RuleIsInRegionRule);
for (unsigned i = 0; i < childRules.size(); ++i) {
StyleRuleBase* regionStylingRule = childRules[i].get();
if (regionStylingRule->isStyleRule())
regionRuleSet->addStyleRule(static_cast<StyleRule*>(regionStylingRule), addRuleFlags);
}
m_ruleCount = regionRuleSet->m_ruleCount;
m_regionSelectorsAndRuleSets.append(RuleSetSelectorPair(regionRule->selectorList().first(), WTF::move(regionRuleSet)));
}
void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase>>& rules, const MediaQueryEvaluator& medium, StyleResolver* resolver, bool hasDocumentSecurityOrigin, bool isInitiatingElementInUserAgentShadowTree, AddRuleFlags addRuleFlags)
{
for (unsigned i = 0; i < rules.size(); ++i) {
StyleRuleBase* rule = rules[i].get();
if (rule->isStyleRule()) {
StyleRule* styleRule = static_cast<StyleRule*>(rule);
addStyleRule(styleRule, addRuleFlags);
} else if (rule->isPageRule())
addPageRule(static_cast<StyleRulePage*>(rule));
else if (rule->isMediaRule()) {
StyleRuleMedia* mediaRule = static_cast<StyleRuleMedia*>(rule);
if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), resolver)))
addChildRules(mediaRule->childRules(), medium, resolver, hasDocumentSecurityOrigin, isInitiatingElementInUserAgentShadowTree, addRuleFlags);
} else if (rule->isFontFaceRule() && resolver) {
const StyleRuleFontFace* fontFaceRule = static_cast<StyleRuleFontFace*>(rule);
resolver->fontSelector()->addFontFaceRule(fontFaceRule, isInitiatingElementInUserAgentShadowTree);
resolver->invalidateMatchedPropertiesCache();
} else if (rule->isKeyframesRule() && resolver) {
resolver->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(rule));
}
#if ENABLE(CSS_REGIONS)
else if (rule->isRegionRule() && resolver) {
addRegionRule(static_cast<StyleRuleRegion*>(rule), hasDocumentSecurityOrigin);
}
#endif
#if ENABLE(CSS_DEVICE_ADAPTATION)
else if (rule->isViewportRule() && resolver) {
resolver->viewportStyleResolver()->addViewportRule(static_cast<StyleRuleViewport*>(rule));
}
#endif
#if ENABLE(CSS3_CONDITIONAL_RULES)
else if (rule->isSupportsRule() && static_cast<StyleRuleSupports*>(rule)->conditionIsSupported())
addChildRules(static_cast<StyleRuleSupports*>(rule)->childRules(), medium, resolver, hasDocumentSecurityOrigin, addRuleFlags);
#endif
}
}
void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, StyleResolver* resolver)
{
ASSERT(sheet);
const Vector<RefPtr<StyleRuleImport>>& importRules = sheet->importRules();
for (unsigned i = 0; i < importRules.size(); ++i) {
StyleRuleImport* importRule = importRules[i].get();
if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), resolver)))
addRulesFromSheet(importRule->styleSheet(), medium, resolver);
}
bool hasDocumentSecurityOrigin = resolver && resolver->document().securityOrigin()->canRequest(sheet->baseURL());
AddRuleFlags addRuleFlags = static_cast<AddRuleFlags>((hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : 0));
bool isInitiatingElementInUserAgentShadowTree = false;
addChildRules(sheet->childRules(), medium, resolver, hasDocumentSecurityOrigin, isInitiatingElementInUserAgentShadowTree, addRuleFlags);
if (m_autoShrinkToFitEnabled)
shrinkToFit();
}
void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags)
{
for (size_t selectorIndex = 0; selectorIndex != notFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
addRule(rule, selectorIndex, addRuleFlags);
}
static inline void shrinkMapVectorsToFit(RuleSet::AtomRuleMap& map)
{
RuleSet::AtomRuleMap::iterator end = map.end();
for (RuleSet::AtomRuleMap::iterator it = map.begin(); it != end; ++it)
it->value->shrinkToFit();
}
void RuleSet::shrinkToFit()
{
shrinkMapVectorsToFit(m_idRules);
shrinkMapVectorsToFit(m_classRules);
shrinkMapVectorsToFit(m_tagRules);
shrinkMapVectorsToFit(m_shadowPseudoElementRules);
m_linkPseudoClassRules.shrinkToFit();
#if ENABLE(VIDEO_TRACK)
m_cuePseudoRules.shrinkToFit();
#endif
m_focusPseudoClassRules.shrinkToFit();
m_universalRules.shrinkToFit();
m_pageRules.shrinkToFit();
}
}