bool SelectorChecker::checkPseudoClass(const CSSSelector& selector)
{
switch (selector.pseudoType()) {
case CSSSelector::PseudoFocus:
m_matchedFocusSelector = true;
return matchesFocusPseudoClass(m_element);
case CSSSelector::PseudoHover:
m_matchedHoverSelector = true;
return m_element.hovered();
case CSSSelector::PseudoActive:
m_matchedActiveSelector = true;
return m_element.active();
case CSSSelector::PseudoLang:
{
AtomicString value = m_element.computeInheritedLanguage();
const AtomicString& argument = selector.argument();
if (value.isEmpty() || !value.startsWith(argument, false))
break;
if (value.length() != argument.length() && value[argument.length()] != '-')
break;
return true;
}
case CSSSelector::PseudoHost:
{
// We can only get here if the selector was defined in the right
// scope so we don't need to check it.
// For empty parameter case, i.e. just :host or :host().
if (!selector.selectorList())
return true;
for (const CSSSelector* current = selector.selectorList()->first(); current; current = CSSSelectorList::next(*current)) {
if (match(*current))
return true;
}
return false;
}
case CSSSelector::PseudoUnknown:
case CSSSelector::PseudoNotParsed:
case CSSSelector::PseudoUserAgentCustomElement:
return false;
}
ASSERT_NOT_REACHED();
return false;
}
static unsigned simpleSelectorFunctionalPseudoClassStaticSpecificity(const CSSSelector& simpleSelector, bool& ok)
{
if (simpleSelector.match() == CSSSelector::PseudoClass) {
CSSSelector::PseudoClassType pseudoClassType = simpleSelector.pseudoClassType();
if (pseudoClassType == CSSSelector::PseudoClassMatches || pseudoClassType == CSSSelector::PseudoClassNthChild || pseudoClassType == CSSSelector::PseudoClassNthLastChild) {
const CSSSelectorList* selectorList = simpleSelector.selectorList();
if (!selectorList) {
ASSERT_WITH_MESSAGE(pseudoClassType != CSSSelector::PseudoClassMatches, ":matches() should never be created without a valid selector list.");
return 0;
}
const CSSSelector& firstSubselector = *selectorList->first();
unsigned initialSpecificity = staticSpecificityInternal(firstSubselector, ok);
if (!ok)
return 0;
const CSSSelector* subselector = &firstSubselector;
while ((subselector = CSSSelectorList::next(subselector))) {
unsigned subSelectorSpecificity = staticSpecificityInternal(*subselector, ok);
if (initialSpecificity != subSelectorSpecificity)
ok = false;
if (!ok)
return 0;
}
return initialSpecificity;
}
}
return 0;
}
static inline bool includesDisallowedPseudoClass(const CSSSelector& selector)
{
if (selector.pseudoType() == CSSSelector::PseudoNot) {
const CSSSelector* subSelector = selector.selectorList()->first();
return subSelector->match() == CSSSelector::PseudoClass;
}
return selector.match() == CSSSelector::PseudoClass;
}
static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData& ruleData)
{
bool foundSiblingSelector = false;
for (CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) {
features.collectFeaturesFromSelector(selector);
if (CSSSelectorList* selectorList = selector->selectorList()) {
for (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()));
}
static unsigned simpleSelectorSpecificityInternal(const CSSSelector& simpleSelector, bool isComputingMaximumSpecificity)
{
ASSERT_WITH_MESSAGE(!simpleSelector.isForPage(), "At the time of this writing, page selectors are not treated as real selectors that are matched. The value computed here only account for real selectors.");
switch (simpleSelector.match()) {
case CSSSelector::Id:
return static_cast<unsigned>(SelectorSpecificityIncrement::ClassA);
case CSSSelector::PagePseudoClass:
break;
case CSSSelector::PseudoClass:
if (simpleSelector.pseudoClassType() == CSSSelector::PseudoClassMatches) {
ASSERT_WITH_MESSAGE(simpleSelector.selectorList() && simpleSelector.selectorList()->first(), "The parser should never generate a valid selector for an empty :matches().");
if (!isComputingMaximumSpecificity)
return 0;
return maxSpecificity(*simpleSelector.selectorList());
}
if (simpleSelector.pseudoClassType() == CSSSelector::PseudoClassNot) {
ASSERT_WITH_MESSAGE(simpleSelector.selectorList() && simpleSelector.selectorList()->first(), "The parser should never generate a valid selector for an empty :not().");
return maxSpecificity(*simpleSelector.selectorList());
}
FALLTHROUGH;
case CSSSelector::Exact:
case CSSSelector::Class:
case CSSSelector::Set:
case CSSSelector::List:
case CSSSelector::Hyphen:
case CSSSelector::Contain:
case CSSSelector::Begin:
case CSSSelector::End:
return static_cast<unsigned>(SelectorSpecificityIncrement::ClassB);
case CSSSelector::Tag:
return (simpleSelector.tagQName().localName() != starAtom) ? static_cast<unsigned>(SelectorSpecificityIncrement::ClassC) : 0;
case CSSSelector::PseudoElement:
return static_cast<unsigned>(SelectorSpecificityIncrement::ClassC);
case CSSSelector::Unknown:
return 0;
}
ASSERT_NOT_REACHED();
return 0;
}