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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005-2016 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2014 Yusuke Suzuki <utatane.tea@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SelectorChecker.h"
#include "CSSSelector.h"
#include "CSSSelectorList.h"
#include "Document.h"
#include "ElementTraversal.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "HTMLDocument.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "HTMLSlotElement.h"
#include "InspectorInstrumentation.h"
#include "Page.h"
#include "RenderElement.h"
#include "SelectorCheckerTestFunctions.h"
#include "ShadowRoot.h"
#include "Text.h"
namespace WebCore {
using namespace HTMLNames;
enum class VisitedMatchType : unsigned char {
Disabled, Enabled
};
struct SelectorChecker::LocalContext {
LocalContext(const CSSSelector& selector, const Element& element, VisitedMatchType visitedMatchType, PseudoId pseudoId)
: selector(&selector)
, element(&element)
, visitedMatchType(visitedMatchType)
, firstSelectorOfTheFragment(&selector)
, pseudoId(pseudoId)
{ }
const CSSSelector* selector;
const Element* element;
VisitedMatchType visitedMatchType;
const CSSSelector* firstSelectorOfTheFragment;
PseudoId pseudoId;
bool isMatchElement { true };
bool isSubjectOrAdjacentElement { true };
bool inFunctionalPseudoClass { false };
bool pseudoElementEffective { true };
bool hasScrollbarPseudo { false };
bool hasSelectionPseudo { false };
bool mayMatchHostPseudoClass { false };
};
static inline void addStyleRelation(SelectorChecker::CheckingContext& checkingContext, const Element& element, Style::Relation::Type type, unsigned value = 1)
{
ASSERT(value == 1 || type == Style::Relation::NthChildIndex || type == Style::Relation::AffectedByEmpty);
if (checkingContext.resolvingMode != SelectorChecker::Mode::ResolvingStyle)
return;
if (type == Style::Relation::AffectsNextSibling && !checkingContext.styleRelations.isEmpty()) {
auto& last = checkingContext.styleRelations.last();
if (last.type == Style::Relation::AffectsNextSibling && last.element == element.nextElementSibling()) {
++last.value;
last.element = &element;
return;
}
}
checkingContext.styleRelations.append({ element, type, value });
}
static inline bool isFirstChildElement(const Element& element)
{
return !ElementTraversal::previousSibling(element);
}
static inline bool isLastChildElement(const Element& element)
{
return !ElementTraversal::nextSibling(element);
}
static inline bool isFirstOfType(const Element& element, const QualifiedName& type)
{
for (const Element* sibling = ElementTraversal::previousSibling(element); sibling; sibling = ElementTraversal::previousSibling(*sibling)) {
if (sibling->hasTagName(type))
return false;
}
return true;
}
static inline bool isLastOfType(const Element& element, const QualifiedName& type)
{
for (const Element* sibling = ElementTraversal::nextSibling(element); sibling; sibling = ElementTraversal::nextSibling(*sibling)) {
if (sibling->hasTagName(type))
return false;
}
return true;
}
static inline int countElementsBefore(const Element& element)
{
int count = 0;
for (const Element* sibling = ElementTraversal::previousSibling(element); sibling; sibling = ElementTraversal::previousSibling(*sibling)) {
unsigned index = sibling->childIndex();
if (index) {
count += index;
break;
}
count++;
}
return count;
}
static inline int countElementsOfTypeBefore(const Element& element, const QualifiedName& type)
{
int count = 0;
for (const Element* sibling = ElementTraversal::previousSibling(element); sibling; sibling = ElementTraversal::previousSibling(*sibling)) {
if (sibling->hasTagName(type))
++count;
}
return count;
}
static inline int countElementsAfter(const Element& element)
{
int count = 0;
for (const Element* sibling = ElementTraversal::nextSibling(element); sibling; sibling = ElementTraversal::nextSibling(*sibling))
++count;
return count;
}
static inline int countElementsOfTypeAfter(const Element& element, const QualifiedName& type)
{
int count = 0;
for (const Element* sibling = ElementTraversal::nextSibling(element); sibling; sibling = ElementTraversal::nextSibling(*sibling)) {
if (sibling->hasTagName(type))
++count;
}
return count;
}
SelectorChecker::SelectorChecker(Document& document)
: m_strictParsing(!document.inQuirksMode())
, m_documentIsHTML(document.isHTMLDocument())
{
}
bool SelectorChecker::match(const CSSSelector& selector, const Element& element, CheckingContext& checkingContext, unsigned& specificity) const
{
specificity = 0;
LocalContext context(selector, element, checkingContext.resolvingMode == SelectorChecker::Mode::QueryingRules ? VisitedMatchType::Disabled : VisitedMatchType::Enabled, checkingContext.pseudoId);
if (checkingContext.isMatchingHostPseudoClass) {
ASSERT(element.shadowRoot());
context.mayMatchHostPseudoClass = true;
}
PseudoIdSet pseudoIdSet;
MatchResult result = matchRecursively(checkingContext, context, pseudoIdSet, specificity);
if (result.match != Match::SelectorMatches)
return false;
if (checkingContext.pseudoId != NOPSEUDO && !pseudoIdSet.has(checkingContext.pseudoId))
return false;
if (checkingContext.pseudoId == NOPSEUDO && pseudoIdSet) {
PseudoIdSet publicPseudoIdSet = pseudoIdSet & PseudoIdSet::fromMask(PUBLIC_PSEUDOID_MASK);
if (checkingContext.resolvingMode == Mode::ResolvingStyle && publicPseudoIdSet)
checkingContext.pseudoIDSet = publicPseudoIdSet;
// When ignoring virtual pseudo elements, the context's pseudo should also be NOPSEUDO but that does
// not cause a failure.
return checkingContext.resolvingMode == Mode::CollectingRulesIgnoringVirtualPseudoElements || result.matchType == MatchType::Element;
}
return true;
}
bool SelectorChecker::matchHostPseudoClass(const CSSSelector& selector, const Element& element, CheckingContext& checkingContext, unsigned& specificity) const
{
ASSERT(element.shadowRoot());
ASSERT(selector.match() == CSSSelector::PseudoClass && selector.pseudoClassType() == CSSSelector::PseudoClassHost);
specificity = selector.simpleSelectorSpecificity();
if (auto* selectorList = selector.selectorList()) {
LocalContext context(*selectorList->first(), element, VisitedMatchType::Enabled, NOPSEUDO);
context.inFunctionalPseudoClass = true;
context.pseudoElementEffective = false;
PseudoIdSet ignoreDynamicPseudo;
unsigned subselectorSpecificity = 0;
if (matchRecursively(checkingContext, context, ignoreDynamicPseudo, subselectorSpecificity).match != Match::SelectorMatches)
return false;
specificity = CSSSelector::addSpecificities(specificity, subselectorSpecificity);
}
return true;
}
inline static bool hasScrollbarPseudoElement(const PseudoIdSet& dynamicPseudoIdSet)
{
PseudoIdSet scrollbarIdSet = { SCROLLBAR, SCROLLBAR_THUMB, SCROLLBAR_BUTTON, SCROLLBAR_TRACK, SCROLLBAR_TRACK_PIECE, SCROLLBAR_CORNER };
if (dynamicPseudoIdSet & scrollbarIdSet)
return true;
// RESIZER does not always have a scrollbar but it is a scrollbar-like pseudo element
// because it can have more than one pseudo element.
return dynamicPseudoIdSet.has(RESIZER);
}
static SelectorChecker::LocalContext localContextForParent(const SelectorChecker::LocalContext& context)
{
SelectorChecker::LocalContext updatedContext(context);
// Disable :visited matching when we see the first link.
if (context.element->isLink())
updatedContext.visitedMatchType = VisitedMatchType::Disabled;
updatedContext.isMatchElement = false;
updatedContext.isSubjectOrAdjacentElement = false;
if (updatedContext.mayMatchHostPseudoClass) {
updatedContext.element = nullptr;
return updatedContext;
}
// Move to the shadow host if matching :host and the parent is the shadow root.
if (context.selector->match() == CSSSelector::PseudoClass && context.selector->pseudoClassType() == CSSSelector::PseudoClassHost && is<ShadowRoot>(context.element->parentNode())) {
updatedContext.element = downcast<ShadowRoot>(*context.element->parentNode()).host();
updatedContext.mayMatchHostPseudoClass = true;
return updatedContext;
}
updatedContext.element = context.element->parentElement();
return updatedContext;
}
// Recursive check of selectors and combinators
// It can return 4 different values:
// * SelectorMatches - the selector matches the element e
// * SelectorFailsLocally - the selector fails for the element e
// * SelectorFailsAllSiblings - the selector fails for e and any sibling of e
// * SelectorFailsCompletely - the selector fails for e and any sibling or ancestor of e
SelectorChecker::MatchResult SelectorChecker::matchRecursively(CheckingContext& checkingContext, const LocalContext& context, PseudoIdSet& dynamicPseudoIdSet, unsigned& specificity) const
{
MatchType matchType = MatchType::Element;
// The first selector has to match.
if (!checkOne(checkingContext, context, dynamicPseudoIdSet, matchType, specificity))
return MatchResult::fails(Match::SelectorFailsLocally);
if (context.selector->match() == CSSSelector::PseudoElement) {
if (context.selector->isCustomPseudoElement()) {
// In functional pseudo class, custom pseudo elements are always disabled.
// FIXME: We should accept custom pseudo elements inside :matches().
if (context.inFunctionalPseudoClass)
return MatchResult::fails(Match::SelectorFailsCompletely);
if (ShadowRoot* root = context.element->containingShadowRoot()) {
if (context.element->shadowPseudoId() != context.selector->value())
return MatchResult::fails(Match::SelectorFailsLocally);
if (context.selector->isWebKitCustomPseudoElement() && root->mode() != ShadowRootMode::UserAgent)
return MatchResult::fails(Match::SelectorFailsLocally);
} else
return MatchResult::fails(Match::SelectorFailsLocally);
} else {
if (!context.pseudoElementEffective)
return MatchResult::fails(Match::SelectorFailsCompletely);
if (checkingContext.resolvingMode == Mode::QueryingRules)
return MatchResult::fails(Match::SelectorFailsCompletely);
PseudoId pseudoId = CSSSelector::pseudoId(context.selector->pseudoElementType());
if (pseudoId != NOPSEUDO)
dynamicPseudoIdSet.add(pseudoId);
matchType = MatchType::VirtualPseudoElementOnly;
}
}
// The rest of the selectors has to match
auto relation = context.selector->relation();
// Prepare next selector
const CSSSelector* leftSelector = context.selector->tagHistory();
if (!leftSelector)
return MatchResult::matches(matchType);
LocalContext nextContext(context);
nextContext.selector = leftSelector;
if (relation != CSSSelector::Subselector) {
// Bail-out if this selector is irrelevant for the pseudoId
if (context.pseudoId != NOPSEUDO && !dynamicPseudoIdSet.has(context.pseudoId))
return MatchResult::fails(Match::SelectorFailsCompletely);
// Disable :visited matching when we try to match anything else than an ancestors.
if (!context.selector->hasDescendantOrChildRelation())
nextContext.visitedMatchType = VisitedMatchType::Disabled;
nextContext.pseudoId = NOPSEUDO;
// Virtual pseudo element is only effective in the rightmost fragment.
nextContext.pseudoElementEffective = false;
nextContext.isMatchElement = false;
}
switch (relation) {
case CSSSelector::DescendantSpace:
nextContext = localContextForParent(nextContext);
nextContext.firstSelectorOfTheFragment = nextContext.selector;
for (; nextContext.element; nextContext = localContextForParent(nextContext)) {
PseudoIdSet ignoreDynamicPseudo;
unsigned descendantsSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo, descendantsSpecificity);
ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo);
if (result.match == Match::SelectorMatches)
specificity = CSSSelector::addSpecificities(specificity, descendantsSpecificity);
if (result.match == Match::SelectorMatches || result.match == Match::SelectorFailsCompletely)
return MatchResult::updateWithMatchType(result, matchType);
}
return MatchResult::fails(Match::SelectorFailsCompletely);
case CSSSelector::Child:
{
nextContext = localContextForParent(nextContext);
if (!nextContext.element)
return MatchResult::fails(Match::SelectorFailsCompletely);
nextContext.firstSelectorOfTheFragment = nextContext.selector;
PseudoIdSet ignoreDynamicPseudo;
unsigned childSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo, childSpecificity);
ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo);
if (result.match == Match::SelectorMatches)
specificity = CSSSelector::addSpecificities(specificity, childSpecificity);
if (result.match == Match::SelectorMatches || result.match == Match::SelectorFailsCompletely)
return MatchResult::updateWithMatchType(result, matchType);
return MatchResult::fails(Match::SelectorFailsAllSiblings);
}
case CSSSelector::DirectAdjacent:
{
auto relation = context.isMatchElement ? Style::Relation::AffectedByPreviousSibling : Style::Relation::DescendantsAffectedByPreviousSibling;
addStyleRelation(checkingContext, *context.element, relation);
Element* previousElement = context.element->previousElementSibling();
if (!previousElement)
return MatchResult::fails(Match::SelectorFailsAllSiblings);
addStyleRelation(checkingContext, *previousElement, Style::Relation::AffectsNextSibling);
nextContext.element = previousElement;
nextContext.firstSelectorOfTheFragment = nextContext.selector;
PseudoIdSet ignoreDynamicPseudo;
unsigned adjacentSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo, adjacentSpecificity);
ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo);
if (result.match == Match::SelectorMatches)
specificity = CSSSelector::addSpecificities(specificity, adjacentSpecificity);
return MatchResult::updateWithMatchType(result, matchType);
}
case CSSSelector::IndirectAdjacent: {
auto relation = context.isMatchElement ? Style::Relation::AffectedByPreviousSibling : Style::Relation::DescendantsAffectedByPreviousSibling;
addStyleRelation(checkingContext, *context.element, relation);
nextContext.element = context.element->previousElementSibling();
nextContext.firstSelectorOfTheFragment = nextContext.selector;
for (; nextContext.element; nextContext.element = nextContext.element->previousElementSibling()) {
addStyleRelation(checkingContext, *nextContext.element, Style::Relation::AffectsNextSibling);
PseudoIdSet ignoreDynamicPseudo;
unsigned indirectAdjacentSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo, indirectAdjacentSpecificity);
ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo);
if (result.match == Match::SelectorMatches)
specificity = CSSSelector::addSpecificities(specificity, indirectAdjacentSpecificity);
if (result.match == Match::SelectorMatches || result.match == Match::SelectorFailsAllSiblings || result.match == Match::SelectorFailsCompletely)
return MatchResult::updateWithMatchType(result, matchType);
};
return MatchResult::fails(Match::SelectorFailsAllSiblings);
}
case CSSSelector::Subselector:
{
// a selector is invalid if something follows a pseudo-element
// We make an exception for scrollbar pseudo elements and allow a set of pseudo classes (but nothing else)
// to follow the pseudo elements.
nextContext.hasScrollbarPseudo = hasScrollbarPseudoElement(dynamicPseudoIdSet);
nextContext.hasSelectionPseudo = dynamicPseudoIdSet.has(SELECTION);
if ((context.isMatchElement || checkingContext.resolvingMode == Mode::CollectingRules) && dynamicPseudoIdSet
&& !nextContext.hasSelectionPseudo
&& !(nextContext.hasScrollbarPseudo && nextContext.selector->match() == CSSSelector::PseudoClass))
return MatchResult::fails(Match::SelectorFailsCompletely);
unsigned subselectorSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, nextContext, dynamicPseudoIdSet, subselectorSpecificity);
if (result.match == Match::SelectorMatches)
specificity = CSSSelector::addSpecificities(specificity, subselectorSpecificity);
return MatchResult::updateWithMatchType(result, matchType);
}
case CSSSelector::ShadowDescendant:
{
Element* shadowHostNode = context.element->shadowHost();
if (!shadowHostNode)
return MatchResult::fails(Match::SelectorFailsCompletely);
nextContext.element = shadowHostNode;
nextContext.firstSelectorOfTheFragment = nextContext.selector;
nextContext.isSubjectOrAdjacentElement = false;
PseudoIdSet ignoreDynamicPseudo;
unsigned shadowDescendantSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo, shadowDescendantSpecificity);
if (result.match == Match::SelectorMatches)
specificity = CSSSelector::addSpecificities(specificity, shadowDescendantSpecificity);
return MatchResult::updateWithMatchType(result, matchType);
}
}
ASSERT_NOT_REACHED();
return MatchResult::fails(Match::SelectorFailsCompletely);
}
static bool attributeValueMatches(const Attribute& attribute, CSSSelector::Match match, const AtomicString& selectorValue, bool caseSensitive)
{
const AtomicString& value = attribute.value();
ASSERT(!value.isNull());
switch (match) {
case CSSSelector::Set:
break;
case CSSSelector::Exact:
if (caseSensitive ? selectorValue != value : !equalIgnoringASCIICase(selectorValue, value))
return false;
break;
case CSSSelector::List:
{
// Ignore empty selectors or selectors containing spaces.
if (selectorValue.isEmpty() || selectorValue.find(isHTMLSpace<UChar>) != notFound)
return false;
unsigned startSearchAt = 0;
while (true) {
size_t foundPos;
if (caseSensitive)
foundPos = value.find(selectorValue, startSearchAt);
else
foundPos = value.findIgnoringASCIICase(selectorValue, startSearchAt);
if (foundPos == notFound)
return false;
if (!foundPos || isHTMLSpace(value[foundPos - 1])) {
unsigned endStr = foundPos + selectorValue.length();
if (endStr == value.length() || isHTMLSpace(value[endStr]))
break; // We found a match.
}
// No match. Keep looking.
startSearchAt = foundPos + 1;
}
break;
}
case CSSSelector::Contain: {
bool valueContainsSelectorValue;
if (caseSensitive)
valueContainsSelectorValue = value.contains(selectorValue);
else
valueContainsSelectorValue = value.containsIgnoringASCIICase(selectorValue);
if (!valueContainsSelectorValue || selectorValue.isEmpty())
return false;
break;
}
case CSSSelector::Begin:
if (selectorValue.isEmpty())
return false;
if (caseSensitive) {
if (!value.startsWith(selectorValue))
return false;
} else {
if (!value.startsWithIgnoringASCIICase(selectorValue))
return false;
}
break;
case CSSSelector::End:
if (selectorValue.isEmpty())
return false;
if (caseSensitive) {
if (!value.endsWith(selectorValue))
return false;
} else {
if (!value.endsWithIgnoringASCIICase(selectorValue))
return false;
}
break;
case CSSSelector::Hyphen:
if (value.length() < selectorValue.length())
return false;
if (caseSensitive) {
if (!value.startsWith(selectorValue))
return false;
} else {
if (!value.startsWithIgnoringASCIICase(selectorValue))
return false;
}
// It they start the same, check for exact match or following '-':
if (value.length() != selectorValue.length() && value[selectorValue.length()] != '-')
return false;
break;
default:
ASSERT_NOT_REACHED();
return false;
}
return true;
}
static bool anyAttributeMatches(const Element& element, const CSSSelector& selector, const QualifiedName& selectorAttr, bool caseSensitive)
{
ASSERT(element.hasAttributesWithoutUpdate());
for (const Attribute& attribute : element.attributesIterator()) {
if (!attribute.matches(selectorAttr.prefix(), element.isHTMLElement() ? selector.attributeCanonicalLocalName() : selectorAttr.localName(), selectorAttr.namespaceURI()))
continue;
if (attributeValueMatches(attribute, selector.match(), selector.value(), caseSensitive))
return true;
}
return false;
}
bool SelectorChecker::attributeSelectorMatches(const Element& element, const QualifiedName& attributeName, const AtomicString& attributeValue, const CSSSelector& selector)
{
ASSERT(selector.isAttributeSelector());
auto& selectorAttribute = selector.attribute();
auto& selectorName = element.isHTMLElement() ? selector.attributeCanonicalLocalName() : selectorAttribute.localName();
if (!Attribute::nameMatchesFilter(attributeName, selectorAttribute.prefix(), selectorName, selectorAttribute.namespaceURI()))
return false;
bool caseSensitive = true;
if (selector.attributeValueMatchingIsCaseInsensitive())
caseSensitive = false;
else if (element.document().isHTMLDocument() && element.isHTMLElement() && !HTMLDocument::isCaseSensitiveAttribute(selector.attribute()))
caseSensitive = false;
return attributeValueMatches(Attribute(attributeName, attributeValue), selector.match(), selector.value(), caseSensitive);
}
static bool canMatchHoverOrActiveInQuirksMode(const SelectorChecker::LocalContext& context)
{
// For quirks mode, follow this: http://quirks.spec.whatwg.org/#the-:active-and-:hover-quirk
// In quirks mode, a compound selector 'selector' that matches the following conditions must not match elements that would not also match the ':any-link' selector.
//
// selector uses the ':active' or ':hover' pseudo-classes.
// selector does not use a type selector.
// selector does not use an attribute selector.
// selector does not use an ID selector.
// selector does not use a class selector.
// selector does not use a pseudo-class selector other than ':active' and ':hover'.
// selector does not use a pseudo-element selector.
// selector is not part of an argument to a functional pseudo-class or pseudo-element.
if (context.inFunctionalPseudoClass)
return true;
for (const CSSSelector* selector = context.firstSelectorOfTheFragment; selector; selector = selector->tagHistory()) {
switch (selector->match()) {
case CSSSelector::Tag:
if (selector->tagQName() != anyQName())
return true;
break;
case CSSSelector::PseudoClass: {
CSSSelector::PseudoClassType pseudoClassType = selector->pseudoClassType();
if (pseudoClassType != CSSSelector::PseudoClassHover && pseudoClassType != CSSSelector::PseudoClassActive)
return true;
break;
}
case CSSSelector::Id:
case CSSSelector::Class:
case CSSSelector::Exact:
case CSSSelector::Set:
case CSSSelector::List:
case CSSSelector::Hyphen:
case CSSSelector::Contain:
case CSSSelector::Begin:
case CSSSelector::End:
case CSSSelector::PagePseudoClass:
case CSSSelector::PseudoElement:
return true;
case CSSSelector::Unknown:
ASSERT_NOT_REACHED();
break;
}
auto relation = selector->relation();
if (relation == CSSSelector::ShadowDescendant)
return true;
if (relation != CSSSelector::Subselector)
return false;
}
return false;
}
static inline bool tagMatches(const Element& element, const CSSSelector& simpleSelector)
{
const QualifiedName& tagQName = simpleSelector.tagQName();
if (tagQName == anyQName())
return true;
const AtomicString& localName = (element.isHTMLElement() && element.document().isHTMLDocument()) ? simpleSelector.tagLowercaseLocalName() : tagQName.localName();
if (localName != starAtom() && localName != element.localName())
return false;
const AtomicString& namespaceURI = tagQName.namespaceURI();
return namespaceURI == starAtom() || namespaceURI == element.namespaceURI();
}
bool SelectorChecker::checkOne(CheckingContext& checkingContext, const LocalContext& context, PseudoIdSet& dynamicPseudoIdSet, MatchType& matchType, unsigned& specificity) const
{
const Element& element = *context.element;
const CSSSelector& selector = *context.selector;
specificity = CSSSelector::addSpecificities(specificity, selector.simpleSelectorSpecificity());
if (context.mayMatchHostPseudoClass) {
// :host doesn't combine with anything except pseudo elements.
bool isHostPseudoClass = selector.match() == CSSSelector::PseudoClass && selector.pseudoClassType() == CSSSelector::PseudoClassHost;
bool isPseudoElement = selector.match() == CSSSelector::PseudoElement;
if (!isHostPseudoClass && !isPseudoElement)
return false;
}
if (selector.match() == CSSSelector::Tag)
return tagMatches(element, selector);
if (selector.match() == CSSSelector::Class)
return element.hasClass() && element.classNames().contains(selector.value());
if (selector.match() == CSSSelector::Id) {
ASSERT(!selector.value().isNull());
return element.idForStyleResolution() == selector.value();
}
if (selector.isAttributeSelector()) {
if (!element.hasAttributes())
return false;
const QualifiedName& attr = selector.attribute();
bool caseSensitive = true;
if (selector.attributeValueMatchingIsCaseInsensitive())
caseSensitive = false;
else if (m_documentIsHTML && element.isHTMLElement() && !HTMLDocument::isCaseSensitiveAttribute(attr))
caseSensitive = false;
return anyAttributeMatches(element, selector, attr, caseSensitive);
}
if (selector.match() == CSSSelector::PseudoClass) {
// Handle :not up front.
if (selector.pseudoClassType() == CSSSelector::PseudoClassNot) {
const CSSSelectorList* selectorList = selector.selectorList();
for (const CSSSelector* subselector = selectorList->first(); subselector; subselector = CSSSelectorList::next(subselector)) {
LocalContext subcontext(context);
subcontext.inFunctionalPseudoClass = true;
subcontext.pseudoElementEffective = false;
subcontext.selector = subselector;
subcontext.firstSelectorOfTheFragment = selectorList->first();
PseudoIdSet ignoreDynamicPseudo;
unsigned ignoredSpecificity;
if (matchRecursively(checkingContext, subcontext, ignoreDynamicPseudo, ignoredSpecificity).match == Match::SelectorMatches) {
ASSERT(!ignoreDynamicPseudo);
return false;
}
}
return true;
}
if (context.hasScrollbarPseudo) {
// CSS scrollbars match a specific subset of pseudo classes, and they have specialized rules for each
// (since there are no elements involved except with window-inactive).
return checkScrollbarPseudoClass(checkingContext, element, selector);
}
// Normal element pseudo class checking.
switch (selector.pseudoClassType()) {
// Pseudo classes:
case CSSSelector::PseudoClassNot:
break; // Already handled up above.
case CSSSelector::PseudoClassEmpty:
{
bool result = true;
for (Node* node = element.firstChild(); node; node = node->nextSibling()) {
if (is<Element>(*node)) {
result = false;
break;
}
if (is<Text>(*node)) {
Text& textNode = downcast<Text>(*node);
if (!textNode.data().isEmpty()) {
result = false;
break;
}
}
}
addStyleRelation(checkingContext, *context.element, Style::Relation::AffectedByEmpty, result);
return result;
}
case CSSSelector::PseudoClassFirstChild:
// first-child matches the first child that is an element
if (const Element* parentElement = element.parentElement()) {
bool isFirstChild = isFirstChildElement(element);
if (isFirstChild)
addStyleRelation(checkingContext, element, Style::Relation::FirstChild);
addStyleRelation(checkingContext, *parentElement, Style::Relation::ChildrenAffectedByFirstChildRules);
return isFirstChild;
}
break;
case CSSSelector::PseudoClassFirstOfType:
// first-of-type matches the first element of its type
if (auto* parentElement = element.parentElement()) {
auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, relation);
return isFirstOfType(element, element.tagQName());
}
break;
case CSSSelector::PseudoClassLastChild:
// last-child matches the last child that is an element
if (const Element* parentElement = element.parentElement()) {
bool isLastChild = parentElement->isFinishedParsingChildren() && isLastChildElement(element);
if (isLastChild)
addStyleRelation(checkingContext, element, Style::Relation::LastChild);
addStyleRelation(checkingContext, *parentElement, Style::Relation::ChildrenAffectedByLastChildRules);
return isLastChild;
}
break;
case CSSSelector::PseudoClassLastOfType:
// last-of-type matches the last element of its type
if (Element* parentElement = element.parentElement()) {
auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByBackwardPositionalRules : Style::Relation::DescendantsAffectedByBackwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, relation);
if (!parentElement->isFinishedParsingChildren())
return false;
return isLastOfType(element, element.tagQName());
}
break;
case CSSSelector::PseudoClassOnlyChild:
if (Element* parentElement = element.parentElement()) {
bool firstChild = isFirstChildElement(element);
bool onlyChild = firstChild && parentElement->isFinishedParsingChildren() && isLastChildElement(element);
addStyleRelation(checkingContext, *parentElement, Style::Relation::ChildrenAffectedByFirstChildRules);
addStyleRelation(checkingContext, *parentElement, Style::Relation::ChildrenAffectedByLastChildRules);
if (firstChild)
addStyleRelation(checkingContext, element, Style::Relation::FirstChild);
if (onlyChild)
addStyleRelation(checkingContext, element, Style::Relation::LastChild);
return onlyChild;
}
break;
case CSSSelector::PseudoClassOnlyOfType:
// FIXME: This selector is very slow.
if (Element* parentElement = element.parentElement()) {
auto forwardRelation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, forwardRelation);
auto backwardRelation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByBackwardPositionalRules : Style::Relation::DescendantsAffectedByBackwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, backwardRelation);
if (!parentElement->isFinishedParsingChildren())
return false;
return isFirstOfType(element, element.tagQName()) && isLastOfType(element, element.tagQName());
}
break;
case CSSSelector::PseudoClassMatches:
{
bool hasMatchedAnything = false;
unsigned maxSpecificity = 0;
MatchType localMatchType = MatchType::VirtualPseudoElementOnly;
for (const CSSSelector* subselector = selector.selectorList()->first(); subselector; subselector = CSSSelectorList::next(subselector)) {
LocalContext subcontext(context);
subcontext.inFunctionalPseudoClass = true;
subcontext.pseudoElementEffective = context.pseudoElementEffective;
subcontext.selector = subselector;
subcontext.firstSelectorOfTheFragment = subselector;
PseudoIdSet localDynamicPseudoIdSet;
unsigned localSpecificity = 0;
MatchResult result = matchRecursively(checkingContext, subcontext, localDynamicPseudoIdSet, localSpecificity);
if (result.match == Match::SelectorMatches) {
maxSpecificity = std::max(maxSpecificity, localSpecificity);
if (result.matchType == MatchType::Element)
localMatchType = MatchType::Element;
dynamicPseudoIdSet.merge(localDynamicPseudoIdSet);
hasMatchedAnything = true;
}
}
if (hasMatchedAnything) {
matchType = localMatchType;
specificity = CSSSelector::addSpecificities(specificity, maxSpecificity);
}
return hasMatchedAnything;
}
case CSSSelector::PseudoClassPlaceholderShown:
if (is<HTMLTextFormControlElement>(element)) {
addStyleRelation(checkingContext, element, Style::Relation::Unique);
return downcast<HTMLTextFormControlElement>(element).isPlaceholderVisible();
}
return false;
case CSSSelector::PseudoClassNthChild:
if (!selector.parseNth())
break;
if (auto* parentElement = element.parentElement()) {
auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, relation);
if (const CSSSelectorList* selectorList = selector.selectorList()) {
unsigned selectorListSpecificity;
if (!matchSelectorList(checkingContext, context, element, *selectorList, selectorListSpecificity))
return false;
specificity = CSSSelector::addSpecificities(specificity, selectorListSpecificity);
}
int count = 1;
if (const CSSSelectorList* selectorList = selector.selectorList()) {
for (Element* sibling = ElementTraversal::previousSibling(element); sibling; sibling = ElementTraversal::previousSibling(*sibling)) {
unsigned ignoredSpecificity;
if (matchSelectorList(checkingContext, context, *sibling, *selectorList, ignoredSpecificity))
++count;
}
} else {
count += countElementsBefore(element);
addStyleRelation(checkingContext, element, Style::Relation::NthChildIndex, count);
}
if (selector.matchNth(count))
return true;
}
break;
case CSSSelector::PseudoClassNthOfType:
if (!selector.parseNth())
break;
if (auto* parentElement = element.parentElement()) {
auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, relation);
int count = 1 + countElementsOfTypeBefore(element, element.tagQName());
if (selector.matchNth(count))
return true;
}
break;
case CSSSelector::PseudoClassNthLastChild:
if (!selector.parseNth())
break;
if (Element* parentElement = element.parentElement()) {
if (const CSSSelectorList* selectorList = selector.selectorList()) {
unsigned selectorListSpecificity;
if (!matchSelectorList(checkingContext, context, element, *selectorList, selectorListSpecificity))
return false;
specificity = CSSSelector::addSpecificities(specificity, selectorListSpecificity);
addStyleRelation(checkingContext, *parentElement, Style::Relation::ChildrenAffectedByPropertyBasedBackwardPositionalRules);
} else {
auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByBackwardPositionalRules : Style::Relation::DescendantsAffectedByBackwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, relation);
}
if (!parentElement->isFinishedParsingChildren())
return false;
int count = 1;
if (const CSSSelectorList* selectorList = selector.selectorList()) {
for (Element* sibling = ElementTraversal::nextSibling(element); sibling; sibling = ElementTraversal::nextSibling(*sibling)) {
unsigned ignoredSpecificity;
if (matchSelectorList(checkingContext, context, *sibling, *selectorList, ignoredSpecificity))
++count;
}
} else
count += countElementsAfter(element);
if (selector.matchNth(count))
return true;
}
break;
case CSSSelector::PseudoClassNthLastOfType:
if (!selector.parseNth())
break;
if (Element* parentElement = element.parentElement()) {
auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByBackwardPositionalRules : Style::Relation::DescendantsAffectedByBackwardPositionalRules;
addStyleRelation(checkingContext, *parentElement, relation);
if (!parentElement->isFinishedParsingChildren())
return false;
int count = 1 + countElementsOfTypeAfter(element, element.tagQName());
if (selector.matchNth(count))
return true;
}
break;
case CSSSelector::PseudoClassTarget:
if (&element == element.document().cssTarget())
return true;
break;
case CSSSelector::PseudoClassAny:
{
LocalContext subcontext(context);
subcontext.inFunctionalPseudoClass = true;
subcontext.pseudoElementEffective = false;
for (subcontext.selector = selector.selectorList()->first(); subcontext.selector; subcontext.selector = CSSSelectorList::next(subcontext.selector)) {
subcontext.firstSelectorOfTheFragment = subcontext.selector;
PseudoIdSet ignoreDynamicPseudo;
unsigned ingoredSpecificity = 0;
if (matchRecursively(checkingContext, subcontext, ignoreDynamicPseudo, ingoredSpecificity).match == Match::SelectorMatches)
return true;
}
}
break;
case CSSSelector::PseudoClassAutofill:
return isAutofilled(element);
case CSSSelector::PseudoClassAutofillStrongPassword:
return isAutofilledStrongPassword(element);
case CSSSelector::PseudoClassAnyLink:
case CSSSelector::PseudoClassAnyLinkDeprecated:
case CSSSelector::PseudoClassLink:
// :visited and :link matches are separated later when applying the style. Here both classes match all links...
return element.isLink();
case CSSSelector::PseudoClassVisited:
// ...except if :visited matching is disabled for ancestor/sibling matching.
// Inside functional pseudo class except for :not, :visited never matches.
if (context.inFunctionalPseudoClass)
return false;
return element.isLink() && context.visitedMatchType == VisitedMatchType::Enabled;
case CSSSelector::PseudoClassDrag:
addStyleRelation(checkingContext, element, Style::Relation::AffectedByDrag);
if (element.renderer() && element.renderer()->isDragging())
return true;
break;
case CSSSelector::PseudoClassFocus:
return matchesFocusPseudoClass(element);
case CSSSelector::PseudoClassFocusWithin:
addStyleRelation(checkingContext, element, Style::Relation::AffectedByFocusWithin);
return element.hasFocusWithin();
case CSSSelector::PseudoClassHover:
if (m_strictParsing || element.isLink() || canMatchHoverOrActiveInQuirksMode(context)) {
addStyleRelation(checkingContext, element, Style::Relation::AffectedByHover);
// See the comment in generateElementIsHovered() in SelectorCompiler.
if (checkingContext.resolvingMode == SelectorChecker::Mode::CollectingRulesIgnoringVirtualPseudoElements && !context.isMatchElement)
return true;
if (element.hovered() || InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoClassHover))
return true;
}
break;
case CSSSelector::PseudoClassActive:
if (m_strictParsing || element.isLink() || canMatchHoverOrActiveInQuirksMode(context)) {
addStyleRelation(checkingContext, element, Style::Relation::AffectedByActive);
if (element.active() || InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoClassActive))
return true;
}
break;
case CSSSelector::PseudoClassEnabled:
return matchesEnabledPseudoClass(element);
case CSSSelector::PseudoClassFullPageMedia:
return isMediaDocument(element);
case CSSSelector::PseudoClassDefault:
return matchesDefaultPseudoClass(element);
case CSSSelector::PseudoClassDisabled:
return matchesDisabledPseudoClass(element);
case CSSSelector::PseudoClassReadOnly:
return matchesReadOnlyPseudoClass(element);
case CSSSelector::PseudoClassReadWrite:
return matchesReadWritePseudoClass(element);
case CSSSelector::PseudoClassOptional:
return isOptionalFormControl(element);
case CSSSelector::PseudoClassRequired:
return isRequiredFormControl(element);
case CSSSelector::PseudoClassValid:
return isValid(element);
case CSSSelector::PseudoClassInvalid:
return isInvalid(element);
case CSSSelector::PseudoClassChecked:
return isChecked(element);
case CSSSelector::PseudoClassIndeterminate:
return matchesIndeterminatePseudoClass(element);
case CSSSelector::PseudoClassRoot:
if (&element == element.document().documentElement())
return true;
break;
case CSSSelector::PseudoClassLang:
{
ASSERT(selector.langArgumentList() && !selector.langArgumentList()->isEmpty());
return matchesLangPseudoClass(element, *selector.langArgumentList());
}
#if ENABLE(FULLSCREEN_API)
case CSSSelector::PseudoClassFullScreen:
return matchesFullScreenPseudoClass(element);
case CSSSelector::PseudoClassAnimatingFullScreenTransition:
return matchesFullScreenAnimatingFullScreenTransitionPseudoClass(element);
case CSSSelector::PseudoClassFullScreenAncestor:
return matchesFullScreenAncestorPseudoClass(element);
case CSSSelector::PseudoClassFullScreenDocument:
return matchesFullScreenDocumentPseudoClass(element);
#endif
case CSSSelector::PseudoClassInRange:
return isInRange(element);
case CSSSelector::PseudoClassOutOfRange:
return isOutOfRange(element);
#if ENABLE(VIDEO_TRACK)
case CSSSelector::PseudoClassFuture:
return matchesFutureCuePseudoClass(element);
case CSSSelector::PseudoClassPast:
return matchesPastCuePseudoClass(element);
#endif
case CSSSelector::PseudoClassScope: {
const Node* contextualReferenceNode = !checkingContext.scope ? element.document().documentElement() : checkingContext.scope;
if (&element == contextualReferenceNode)
return true;
break;
}
case CSSSelector::PseudoClassHost: {
if (!context.mayMatchHostPseudoClass)
return false;
unsigned hostSpecificity;
if (!matchHostPseudoClass(selector, element, checkingContext, hostSpecificity))
return false;
specificity = CSSSelector::addSpecificities(specificity, hostSpecificity);
return true;
}
case CSSSelector::PseudoClassDefined:
return isDefinedElement(element);
case CSSSelector::PseudoClassWindowInactive:
return isWindowInactive(element);
case CSSSelector::PseudoClassHorizontal:
case CSSSelector::PseudoClassVertical:
case CSSSelector::PseudoClassDecrement:
case CSSSelector::PseudoClassIncrement:
case CSSSelector::PseudoClassStart:
case CSSSelector::PseudoClassEnd:
case CSSSelector::PseudoClassDoubleButton:
case CSSSelector::PseudoClassSingleButton:
case CSSSelector::PseudoClassNoButton:
case CSSSelector::PseudoClassCornerPresent:
return false;
#if ENABLE(CSS_SELECTORS_LEVEL4)
// FIXME: Implement :dir() selector.
case CSSSelector::PseudoClassDir:
return false;
// FIXME: Implement :role() selector.
case CSSSelector::PseudoClassRole:
return false;
#endif
case CSSSelector::PseudoClassUnknown:
ASSERT_NOT_REACHED();
break;
}
return false;
}
#if ENABLE(VIDEO_TRACK)
if (selector.match() == CSSSelector::PseudoElement && selector.pseudoElementType() == CSSSelector::PseudoElementCue) {
LocalContext subcontext(context);
const CSSSelector* const & selector = context.selector;
for (subcontext.selector = selector->selectorList()->first(); subcontext.selector; subcontext.selector = CSSSelectorList::next(subcontext.selector)) {
subcontext.firstSelectorOfTheFragment = subcontext.selector;
subcontext.inFunctionalPseudoClass = true;
subcontext.pseudoElementEffective = false;
PseudoIdSet ignoredDynamicPseudo;
unsigned ignoredSpecificity = 0;
if (matchRecursively(checkingContext, subcontext, ignoredDynamicPseudo, ignoredSpecificity).match == Match::SelectorMatches)
return true;
}
return false;
}
#endif
if (selector.match() == CSSSelector::PseudoElement && selector.pseudoElementType() == CSSSelector::PseudoElementSlotted) {
// We see ::slotted() pseudo elements when collecting slotted rules from the slot shadow tree only.
ASSERT(checkingContext.resolvingMode == Mode::CollectingRules);
return is<HTMLSlotElement>(element);
}
return true;
}
bool SelectorChecker::matchSelectorList(CheckingContext& checkingContext, const LocalContext& context, const Element& element, const CSSSelectorList& selectorList, unsigned& specificity) const
{
specificity = 0;
bool hasMatchedAnything = false;
for (const CSSSelector* subselector = selectorList.first(); subselector; subselector = CSSSelectorList::next(subselector)) {
LocalContext subcontext(context);
subcontext.element = &element;
subcontext.selector = subselector;
subcontext.inFunctionalPseudoClass = true;
subcontext.pseudoElementEffective = false;
subcontext.firstSelectorOfTheFragment = subselector;
PseudoIdSet ignoreDynamicPseudo;
unsigned localSpecificity = 0;
if (matchRecursively(checkingContext, subcontext, ignoreDynamicPseudo, localSpecificity).match == Match::SelectorMatches) {
ASSERT(!ignoreDynamicPseudo);
hasMatchedAnything = true;
specificity = std::max(specificity, localSpecificity);
}
}
return hasMatchedAnything;
}
bool SelectorChecker::checkScrollbarPseudoClass(const CheckingContext& checkingContext, const Element& element, const CSSSelector& selector) const
{
ASSERT(selector.match() == CSSSelector::PseudoClass);
switch (selector.pseudoClassType()) {
case CSSSelector::PseudoClassWindowInactive:
return isWindowInactive(element);
case CSSSelector::PseudoClassEnabled:
return scrollbarMatchesEnabledPseudoClass(checkingContext);
case CSSSelector::PseudoClassDisabled:
return scrollbarMatchesDisabledPseudoClass(checkingContext);
case CSSSelector::PseudoClassHover:
return scrollbarMatchesHoverPseudoClass(checkingContext);
case CSSSelector::PseudoClassActive:
return scrollbarMatchesActivePseudoClass(checkingContext);
case CSSSelector::PseudoClassHorizontal:
return scrollbarMatchesHorizontalPseudoClass(checkingContext);
case CSSSelector::PseudoClassVertical:
return scrollbarMatchesVerticalPseudoClass(checkingContext);
case CSSSelector::PseudoClassDecrement:
return scrollbarMatchesDecrementPseudoClass(checkingContext);
case CSSSelector::PseudoClassIncrement:
return scrollbarMatchesIncrementPseudoClass(checkingContext);
case CSSSelector::PseudoClassStart:
return scrollbarMatchesStartPseudoClass(checkingContext);
case CSSSelector::PseudoClassEnd:
return scrollbarMatchesEndPseudoClass(checkingContext);
case CSSSelector::PseudoClassDoubleButton:
return scrollbarMatchesDoubleButtonPseudoClass(checkingContext);
case CSSSelector::PseudoClassSingleButton:
return scrollbarMatchesSingleButtonPseudoClass(checkingContext);
case CSSSelector::PseudoClassNoButton:
return scrollbarMatchesNoButtonPseudoClass(checkingContext);
case CSSSelector::PseudoClassCornerPresent:
return scrollbarMatchesCornerPresentPseudoClass(checkingContext);
default:
return false;
}
}
unsigned SelectorChecker::determineLinkMatchType(const CSSSelector* selector)
{
unsigned linkMatchType = MatchAll;
// Statically determine if this selector will match a link in visited, unvisited or any state, or never.
// :visited never matches other elements than the innermost link element.
for (; selector; selector = selector->tagHistory()) {
if (selector->match() == CSSSelector::PseudoClass) {
switch (selector->pseudoClassType()) {
case CSSSelector::PseudoClassLink:
linkMatchType &= ~SelectorChecker::MatchVisited;
break;
case CSSSelector::PseudoClassVisited:
linkMatchType &= ~SelectorChecker::MatchLink;
break;
default:
break;
}
}
auto relation = selector->relation();
if (relation == CSSSelector::Subselector)
continue;
if (!selector->hasDescendantOrChildRelation())
return linkMatchType;
if (linkMatchType != MatchAll)
return linkMatchType;
}
return linkMatchType;
}
static bool isFrameFocused(const Element& element)
{
return element.document().frame() && element.document().frame()->selection().isFocusedAndActive();
}
bool SelectorChecker::matchesFocusPseudoClass(const Element& element)
{
if (InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoClassFocus))
return true;
return element.focused() && isFrameFocused(element);
}
}