| /* |
| * 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 "CommonAtomStrings.h" |
| #include "Document.h" |
| #include "ElementInlines.h" |
| #include "ElementRareData.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 "RuleFeature.h" |
| #include "SelectorCheckerTestFunctions.h" |
| #include "ShadowRoot.h" |
| #include "StyleRule.h" |
| #include "StyleScope.h" |
| #include "Text.h" |
| #include "TypedElementDescendantIterator.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 mustMatchHostPseudoClass { 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) const |
| { |
| LocalContext context(selector, element, checkingContext.resolvingMode == SelectorChecker::Mode::QueryingRules ? VisitedMatchType::Disabled : VisitedMatchType::Enabled, checkingContext.pseudoId); |
| |
| if (checkingContext.styleScopeOrdinal == Style::ScopeOrdinal::Shadow) { |
| ASSERT(element.shadowRoot()); |
| // Rules coming from the element's shadow tree must match :host pseudo class. |
| context.mustMatchHostPseudoClass = true; |
| } |
| |
| PseudoIdSet pseudoIdSet; |
| MatchResult result = matchRecursively(checkingContext, context, pseudoIdSet); |
| if (result.match != Match::SelectorMatches) |
| return false; |
| if (checkingContext.pseudoId != PseudoId::None && !pseudoIdSet.has(checkingContext.pseudoId)) |
| return false; |
| |
| if (checkingContext.pseudoId == PseudoId::None && pseudoIdSet) { |
| PseudoIdSet publicPseudoIdSet = pseudoIdSet & PseudoIdSet::fromMask(static_cast<unsigned>(PseudoId::PublicPseudoIdMask)); |
| if (checkingContext.resolvingMode == Mode::ResolvingStyle && publicPseudoIdSet) |
| checkingContext.pseudoIDSet = publicPseudoIdSet; |
| |
| // When ignoring virtual pseudo elements, the context's pseudo should also be PseudoId::None 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) const |
| { |
| if (!element.shadowRoot()) |
| return false; |
| |
| if (auto* selectorList = selector.selectorList()) { |
| LocalContext context(*selectorList->first(), element, VisitedMatchType::Enabled, PseudoId::None); |
| context.inFunctionalPseudoClass = true; |
| context.pseudoElementEffective = false; |
| PseudoIdSet ignoreDynamicPseudo; |
| if (matchRecursively(checkingContext, context, ignoreDynamicPseudo).match != Match::SelectorMatches) |
| return false; |
| } |
| return true; |
| } |
| |
| inline static bool hasScrollbarPseudoElement(const PseudoIdSet& dynamicPseudoIdSet) |
| { |
| PseudoIdSet scrollbarIdSet = { PseudoId::Scrollbar, PseudoId::ScrollbarThumb, PseudoId::ScrollbarButton, PseudoId::ScrollbarTrack, PseudoId::ScrollbarTrackPiece, PseudoId::ScrollbarCorner }; |
| if (dynamicPseudoIdSet & scrollbarIdSet) |
| return true; |
| |
| // PseudoId::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(PseudoId::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.mustMatchHostPseudoClass) { |
| 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.mustMatchHostPseudoClass = 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) const |
| { |
| MatchType matchType = MatchType::Element; |
| |
| // The first selector has to match. |
| if (!checkOne(checkingContext, context, matchType)) |
| 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 :is()/: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 != PseudoId::None) |
| 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 != PseudoId::None && !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 = PseudoId::None; |
| |
| bool allowMultiplePseudoElements = relation == CSSSelector::ShadowDescendant; |
| // Virtual pseudo element is only effective in the rightmost fragment. |
| if (!allowMultiplePseudoElements) |
| 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; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo); |
| |
| 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; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo); |
| |
| 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; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo); |
| |
| 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; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| ASSERT(!nextContext.pseudoElementEffective && !ignoreDynamicPseudo); |
| |
| 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(PseudoId::Selection); |
| if ((context.isMatchElement || checkingContext.resolvingMode == Mode::CollectingRules) && dynamicPseudoIdSet |
| && !nextContext.hasSelectionPseudo |
| && !(nextContext.hasScrollbarPseudo && nextContext.selector->match() == CSSSelector::PseudoClass)) |
| return MatchResult::fails(Match::SelectorFailsCompletely); |
| |
| MatchResult result = matchRecursively(checkingContext, nextContext, dynamicPseudoIdSet); |
| |
| return MatchResult::updateWithMatchType(result, matchType); |
| } |
| case CSSSelector::ShadowDescendant: { |
| auto* host = context.element->shadowHost(); |
| if (!host) |
| return MatchResult::fails(Match::SelectorFailsCompletely); |
| |
| nextContext.element = host; |
| nextContext.firstSelectorOfTheFragment = nextContext.selector; |
| nextContext.isSubjectOrAdjacentElement = false; |
| PseudoIdSet ignoreDynamicPseudo; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| |
| return MatchResult::updateWithMatchType(result, matchType); |
| } |
| case CSSSelector::ShadowPartDescendant: { |
| // Continue matching in the scope where this rule came from. |
| auto* host = checkingContext.styleScopeOrdinal == Style::ScopeOrdinal::Element |
| ? context.element->shadowHost() |
| : Style::hostForScopeOrdinal(*context.element, checkingContext.styleScopeOrdinal); |
| if (!host) |
| return MatchResult::fails(Match::SelectorFailsCompletely); |
| |
| nextContext.element = host; |
| nextContext.firstSelectorOfTheFragment = nextContext.selector; |
| nextContext.isSubjectOrAdjacentElement = false; |
| // ::part rules from the element's own scope can only match if they apply to :host. |
| nextContext.mustMatchHostPseudoClass = checkingContext.styleScopeOrdinal == Style::ScopeOrdinal::Element; |
| PseudoIdSet ignoreDynamicPseudo; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| |
| return MatchResult::updateWithMatchType(result, matchType); |
| } |
| case CSSSelector::ShadowSlotted: { |
| // We continue matching in the scope where this rule came from. |
| auto slot = Style::assignedSlotForScopeOrdinal(*context.element, checkingContext.styleScopeOrdinal); |
| if (!slot) |
| return MatchResult::fails(Match::SelectorFailsCompletely); |
| |
| nextContext.element = slot; |
| nextContext.firstSelectorOfTheFragment = nextContext.selector; |
| nextContext.isSubjectOrAdjacentElement = false; |
| PseudoIdSet ignoreDynamicPseudo; |
| MatchResult result = matchRecursively(checkingContext, nextContext, ignoreDynamicPseudo); |
| |
| return MatchResult::updateWithMatchType(result, matchType); |
| } |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return MatchResult::fails(Match::SelectorFailsCompletely); |
| } |
| |
| static bool attributeValueMatches(const Attribute& attribute, CSSSelector::Match match, const AtomString& selectorValue, bool caseSensitive) |
| { |
| const AtomString& 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 AtomString& 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 || relation == CSSSelector::ShadowPartDescendant) |
| 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 AtomString& localName = (element.isHTMLElement() && element.document().isHTMLDocument()) ? simpleSelector.tagLowercaseLocalName() : tagQName.localName(); |
| |
| if (localName != starAtom() && localName != element.localName()) |
| return false; |
| const AtomString& namespaceURI = tagQName.namespaceURI(); |
| return namespaceURI == starAtom() || namespaceURI == element.namespaceURI(); |
| } |
| |
| bool SelectorChecker::checkOne(CheckingContext& checkingContext, const LocalContext& context, MatchType& matchType) const |
| { |
| const Element& element = *context.element; |
| const CSSSelector& selector = *context.selector; |
| |
| if (context.mustMatchHostPseudoClass) { |
| // :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; |
| |
| if (matchRecursively(checkingContext, subcontext, ignoreDynamicPseudo).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 |
| bool isFirstChild = isFirstChildElement(element); |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) |
| addStyleRelation(checkingContext, downcast<Element>(*parent), Style::Relation::ChildrenAffectedByFirstChildRules); |
| else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| if (!isFirstChild) |
| break; |
| addStyleRelation(checkingContext, element, Style::Relation::FirstChild); |
| return true; |
| } |
| case CSSSelector::PseudoClassFirstOfType: { |
| // first-of-type matches the first element of its type |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules; |
| addStyleRelation(checkingContext, downcast<Element>(*parent), relation); |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| return isFirstOfType(element, element.tagQName()); |
| } |
| case CSSSelector::PseudoClassLastChild: { |
| // last-child matches the last child that is an element |
| auto* parent = element.parentNode(); |
| bool isLastChild = isLastChildElement(element); |
| if (is<Element>(parent)) { |
| auto& parentElement = downcast<Element>(*parent); |
| if (!parentElement.isFinishedParsingChildren()) |
| isLastChild = false; |
| addStyleRelation(checkingContext, parentElement, Style::Relation::ChildrenAffectedByLastChildRules); |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| if (!isLastChild) |
| break; |
| addStyleRelation(checkingContext, element, Style::Relation::LastChild); |
| return true; |
| } |
| case CSSSelector::PseudoClassLastOfType: { |
| // last-of-type matches the last element of its type |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto& parentElement = downcast<Element>(*parent); |
| auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByBackwardPositionalRules : Style::Relation::DescendantsAffectedByBackwardPositionalRules; |
| addStyleRelation(checkingContext, parentElement, relation); |
| if (!parentElement.isFinishedParsingChildren()) |
| return false; |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| return isLastOfType(element, element.tagQName()); |
| } |
| case CSSSelector::PseudoClassOnlyChild: { |
| auto* parent = element.parentNode(); |
| bool firstChild = isFirstChildElement(element); |
| bool onlyChild = firstChild && isLastChildElement(element); |
| if (is<Element>(parent)) { |
| auto& parentElement = downcast<Element>(*parent); |
| addStyleRelation(checkingContext, parentElement, Style::Relation::ChildrenAffectedByFirstChildRules); |
| addStyleRelation(checkingContext, parentElement, Style::Relation::ChildrenAffectedByLastChildRules); |
| if (!parentElement.isFinishedParsingChildren()) |
| onlyChild = false; |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| if (firstChild) |
| addStyleRelation(checkingContext, element, Style::Relation::FirstChild); |
| if (onlyChild) |
| addStyleRelation(checkingContext, element, Style::Relation::LastChild); |
| return onlyChild; |
| } |
| case CSSSelector::PseudoClassOnlyOfType: { |
| // FIXME: This selector is very slow. |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto& parentElement = downcast<Element>(*parent); |
| 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; |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| return isFirstOfType(element, element.tagQName()) && isLastOfType(element, element.tagQName()); |
| } |
| case CSSSelector::PseudoClassIs: |
| case CSSSelector::PseudoClassWhere: |
| case CSSSelector::PseudoClassMatches: |
| case CSSSelector::PseudoClassAny: |
| { |
| bool hasMatchedAnything = false; |
| |
| 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; |
| subcontext.pseudoId = PseudoId::None; |
| PseudoIdSet localDynamicPseudoIdSet; |
| MatchResult result = matchRecursively(checkingContext, subcontext, localDynamicPseudoIdSet); |
| |
| // Pseudo elements are not valid inside :is()/:matches() |
| if (localDynamicPseudoIdSet) |
| continue; |
| |
| if (result.match == Match::SelectorMatches) { |
| if (result.matchType == MatchType::Element) |
| localMatchType = MatchType::Element; |
| |
| hasMatchedAnything = true; |
| } |
| } |
| if (hasMatchedAnything) |
| matchType = localMatchType; |
| return hasMatchedAnything; |
| } |
| case CSSSelector::PseudoClassHas: { |
| for (auto* hasSelector = selector.selectorList()->first(); hasSelector; hasSelector = CSSSelectorList::next(hasSelector)) { |
| if (matchHasPseudoClass(checkingContext, element, *hasSelector)) |
| return true; |
| } |
| return false; |
| } |
| case CSSSelector::PseudoClassPlaceholderShown: |
| if (is<HTMLTextFormControlElement>(element)) { |
| addStyleRelation(checkingContext, element, Style::Relation::Unique); |
| return downcast<HTMLTextFormControlElement>(element).isPlaceholderVisible(); |
| } |
| return false; |
| case CSSSelector::PseudoClassNthChild: { |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules; |
| addStyleRelation(checkingContext, downcast<Element>(*parent), relation); |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| |
| if (const CSSSelectorList* selectorList = selector.selectorList()) { |
| if (!matchSelectorList(checkingContext, context, element, *selectorList)) |
| return false; |
| } |
| |
| int count = 1; |
| if (const CSSSelectorList* selectorList = selector.selectorList()) { |
| for (Element* sibling = ElementTraversal::previousSibling(element); sibling; sibling = ElementTraversal::previousSibling(*sibling)) { |
| if (matchSelectorList(checkingContext, context, *sibling, *selectorList)) |
| ++count; |
| } |
| } else { |
| count += countElementsBefore(element); |
| addStyleRelation(checkingContext, element, Style::Relation::NthChildIndex, count); |
| } |
| |
| if (selector.matchNth(count)) |
| return true; |
| break; |
| } |
| case CSSSelector::PseudoClassNthOfType: { |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByForwardPositionalRules : Style::Relation::DescendantsAffectedByForwardPositionalRules; |
| addStyleRelation(checkingContext, downcast<Element>(*parent), relation); |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| |
| int count = 1 + countElementsOfTypeBefore(element, element.tagQName()); |
| if (selector.matchNth(count)) |
| return true; |
| break; |
| } |
| case CSSSelector::PseudoClassNthLastChild: { |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto& parentElement = downcast<Element>(*parent); |
| if (const CSSSelectorList* selectorList = selector.selectorList()) { |
| if (!matchSelectorList(checkingContext, context, element, *selectorList)) |
| return false; |
| |
| 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; |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| |
| int count = 1; |
| if (const CSSSelectorList* selectorList = selector.selectorList()) { |
| for (Element* sibling = ElementTraversal::nextSibling(element); sibling; sibling = ElementTraversal::nextSibling(*sibling)) { |
| if (matchSelectorList(checkingContext, context, *sibling, *selectorList)) |
| ++count; |
| } |
| } else |
| count += countElementsAfter(element); |
| |
| return selector.matchNth(count); |
| } |
| case CSSSelector::PseudoClassNthLastOfType: { |
| auto* parent = element.parentNode(); |
| if (is<Element>(parent)) { |
| auto& parentElement = downcast<Element>(*parent); |
| auto relation = context.isSubjectOrAdjacentElement ? Style::Relation::ChildrenAffectedByBackwardPositionalRules : Style::Relation::DescendantsAffectedByBackwardPositionalRules; |
| addStyleRelation(checkingContext, parentElement, relation); |
| |
| if (!parentElement.isFinishedParsingChildren()) |
| return false; |
| } else if (!is<ShadowRoot>(parent)) |
| break; // FIXME: Add the support for specifying relations on ShadowRoot. |
| int count = 1 + countElementsOfTypeAfter(element, element.tagQName()); |
| return selector.matchNth(count); |
| } |
| case CSSSelector::PseudoClassTarget: |
| if (&element == element.document().cssTarget() || InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoClassTarget)) |
| return true; |
| break; |
| case CSSSelector::PseudoClassAutofill: |
| return isAutofilled(element); |
| case CSSSelector::PseudoClassAutofillAndObscured: |
| return isAutofilledAndObscured(element); |
| case CSSSelector::PseudoClassAutofillStrongPassword: |
| return isAutofilledStrongPassword(element); |
| case CSSSelector::PseudoClassAutofillStrongPasswordViewable: |
| return isAutofilledStrongPasswordViewable(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: |
| return element.isBeingDragged(); |
| case CSSSelector::PseudoClassFocus: |
| return matchesFocusPseudoClass(element); |
| case CSSSelector::PseudoClassFocusVisible: |
| return matchesFocusVisiblePseudoClass(element); |
| case CSSSelector::PseudoClassFocusWithin: |
| return element.hasFocusWithin(); |
| case CSSSelector::PseudoClassHover: |
| if (m_strictParsing || element.isLink() || canMatchHoverOrActiveInQuirksMode(context)) { |
| // 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)) { |
| 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.argumentList() && !selector.argumentList()->isEmpty()); |
| return matchesLangPseudoClass(element, *selector.argumentList()); |
| } |
| #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); |
| case CSSSelector::PseudoClassFullScreenControlsHidden: |
| return matchesFullScreenControlsHiddenPseudoClass(element); |
| #endif |
| #if ENABLE(PICTURE_IN_PICTURE_API) |
| case CSSSelector::PseudoClassPictureInPicture: |
| return matchesPictureInPicturePseudoClass(element); |
| #endif |
| case CSSSelector::PseudoClassInRange: |
| return isInRange(element); |
| case CSSSelector::PseudoClassOutOfRange: |
| return isOutOfRange(element); |
| #if ENABLE(VIDEO) |
| case CSSSelector::PseudoClassFuture: |
| return matchesFutureCuePseudoClass(element); |
| case CSSSelector::PseudoClassPast: |
| return matchesPastCuePseudoClass(element); |
| case CSSSelector::PseudoClassPlaying: |
| return matchesPlayingPseudoClass(element); |
| case CSSSelector::PseudoClassPaused: |
| return matchesPausedPseudoClass(element); |
| case CSSSelector::PseudoClassSeeking: |
| return matchesSeekingPseudoClass(element); |
| case CSSSelector::PseudoClassBuffering: |
| return matchesBufferingPseudoClass(element); |
| case CSSSelector::PseudoClassStalled: |
| return matchesStalledPseudoClass(element); |
| case CSSSelector::PseudoClassMuted: |
| return matchesMutedPseudoClass(element); |
| case CSSSelector::PseudoClassVolumeLocked: |
| return matchesVolumeLockedPseudoClass(element); |
| #endif |
| |
| case CSSSelector::PseudoClassScope: |
| case CSSSelector::PseudoClassRelativeScope: { |
| const Node* contextualReferenceNode = !checkingContext.scope ? element.document().documentElement() : checkingContext.scope; |
| |
| bool matches = &element == contextualReferenceNode || checkingContext.matchesAllScopes; |
| |
| if (!matches && checkingContext.scope) { |
| if (element.isDescendantOf(*checkingContext.scope)) |
| checkingContext.matchedInsideScope = true; |
| } |
| |
| return matches; |
| } |
| case CSSSelector::PseudoClassHost: { |
| if (!context.mustMatchHostPseudoClass) |
| return false; |
| return matchHostPseudoClass(selector, element, checkingContext); |
| } |
| 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 |
| |
| #if ENABLE(ATTACHMENT_ELEMENT) |
| case CSSSelector::PseudoClassHasAttachment: |
| return hasAttachment(element); |
| #endif |
| |
| case CSSSelector::PseudoClassModal: |
| return matchesModalPseudoClass(element); |
| |
| case CSSSelector::PseudoClassUnknown: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| return false; |
| } |
| |
| if (selector.match() == CSSSelector::PseudoElement) { |
| switch (selector.pseudoElementType()) { |
| #if ENABLE(VIDEO) |
| case 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; |
| if (matchRecursively(checkingContext, subcontext, ignoredDynamicPseudo).match == Match::SelectorMatches) |
| return true; |
| } |
| return false; |
| } |
| #endif |
| case CSSSelector::PseudoElementSlotted: { |
| if (!context.element->assignedSlot()) |
| return false; |
| // ::slotted matches after flattening so it can't match an active <slot>. |
| if (is<HTMLSlotElement>(*context.element) && context.element->containingShadowRoot()) |
| return false; |
| auto* subselector = context.selector->selectorList()->first(); |
| LocalContext subcontext(context); |
| subcontext.selector = subselector; |
| subcontext.firstSelectorOfTheFragment = subselector; |
| subcontext.pseudoElementEffective = false; |
| subcontext.inFunctionalPseudoClass = true; |
| PseudoIdSet ignoredDynamicPseudo; |
| return matchRecursively(checkingContext, subcontext, ignoredDynamicPseudo).match == Match::SelectorMatches; |
| } |
| case CSSSelector::PseudoElementPart: { |
| auto translatePartNameToRuleScope = [&](AtomString partName) { |
| Vector<AtomString, 1> mappedNames { partName }; |
| |
| if (checkingContext.styleScopeOrdinal == Style::ScopeOrdinal::Element) |
| return mappedNames; |
| |
| auto* ruleScopeHost = Style::hostForScopeOrdinal(*context.element, checkingContext.styleScopeOrdinal); |
| |
| for (auto* shadowRoot = element.containingShadowRoot(); shadowRoot; shadowRoot = shadowRoot->host()->containingShadowRoot()) { |
| // Apply mappings up to the scope the rules are coming from. |
| if (shadowRoot->host() == ruleScopeHost) |
| break; |
| |
| Vector<AtomString, 1> newMappedNames; |
| for (auto& name : mappedNames) |
| newMappedNames.appendVector(shadowRoot->partMappings().get(name)); |
| mappedNames = newMappedNames; |
| |
| if (mappedNames.isEmpty()) |
| break; |
| } |
| return mappedNames; |
| }; |
| |
| Vector<AtomString, 4> translatedPartNames; |
| for (unsigned i = 0; i < element.partNames().size(); ++i) |
| translatedPartNames.appendVector(translatePartNameToRuleScope(element.partNames()[i])); |
| |
| for (auto& part : *selector.argumentList()) { |
| if (!translatedPartNames.contains(part)) |
| return false; |
| } |
| return true; |
| } |
| |
| case CSSSelector::PseudoElementHighlight: |
| // Always matches when not specifically requested so it gets added to the pseudoIdSet. |
| if (checkingContext.pseudoId == PseudoId::None) |
| return true; |
| if (checkingContext.pseudoId != PseudoId::Highlight || !selector.argumentList()) |
| return false; |
| return selector.argumentList()->first() == checkingContext.nameForHightlightPseudoElement; |
| |
| default: |
| return true; |
| } |
| } |
| return true; |
| } |
| |
| bool SelectorChecker::matchSelectorList(CheckingContext& checkingContext, const LocalContext& context, const Element& element, const CSSSelectorList& selectorList) const |
| { |
| 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; |
| if (matchRecursively(checkingContext, subcontext, ignoreDynamicPseudo).match == Match::SelectorMatches) { |
| ASSERT(!ignoreDynamicPseudo); |
| |
| hasMatchedAnything = true; |
| } |
| } |
| return hasMatchedAnything; |
| } |
| |
| bool SelectorChecker::matchHasPseudoClass(CheckingContext& checkingContext, const Element& element, const CSSSelector& hasSelector) const |
| { |
| auto matchElement = Style::computeHasPseudoClassMatchElement(hasSelector); |
| |
| auto canMatch = [&] { |
| switch (matchElement) { |
| case Style::MatchElement::HasChild: |
| case Style::MatchElement::HasDescendant: |
| return !!element.firstElementChild(); |
| case Style::MatchElement::HasSibling: |
| case Style::MatchElement::HasSiblingDescendant: |
| return !!element.nextElementSibling(); |
| default: |
| return true; |
| }; |
| }; |
| |
| // See if there are any elements that this :has() selector could match. |
| if (!canMatch()) |
| return false; |
| |
| auto* cache = checkingContext.selectorMatchingState ? &checkingContext.selectorMatchingState->hasPseudoClassMatchCache : nullptr; |
| |
| auto checkForCachedMatch = [&]() -> std::optional<bool> { |
| if (!cache) |
| return { }; |
| switch (cache->get(Style::makeHasPseudoClassCacheKey(element, hasSelector))) { |
| case Style::HasPseudoClassMatch::Matches: |
| return true; |
| case Style::HasPseudoClassMatch::Fails: |
| case Style::HasPseudoClassMatch::FailsSubtree: |
| return false; |
| case Style::HasPseudoClassMatch::None: |
| break; |
| } |
| return { }; |
| }; |
| |
| // See if we know the result already. |
| if (auto match = checkForCachedMatch()) |
| return *match; |
| |
| auto filterForElement = [&]() -> Style::HasSelectorFilter* { |
| if (!checkingContext.selectorMatchingState) |
| return nullptr; |
| auto type = Style::HasSelectorFilter::typeForMatchElement(matchElement); |
| if (!type) |
| return nullptr; |
| auto& filtersMap = checkingContext.selectorMatchingState->hasPseudoClassSelectorFilters; |
| auto addResult = filtersMap.add(Style::makeHasPseudoClassFilterKey(element, *type), std::unique_ptr<Style::HasSelectorFilter>()); |
| // Only build a filter if the same element gets checked second time with a different selector (misses the match cache). |
| if (addResult.isNewEntry) |
| return nullptr; |
| |
| if (!addResult.iterator->value) |
| addResult.iterator->value = makeUnique<Style::HasSelectorFilter>(element, *type); |
| return addResult.iterator->value.get(); |
| }; |
| |
| // Check if the bloom filter rejects this selector |
| if (auto* filter = filterForElement()) { |
| if (filter->reject(hasSelector)) |
| return false; |
| } |
| |
| CheckingContext hasCheckingContext(SelectorChecker::Mode::ResolvingStyle); |
| hasCheckingContext.scope = &element; |
| |
| bool matchedInsideScope = false; |
| |
| auto checkRelative = [&](auto& elementToCheck) { |
| LocalContext hasContext(hasSelector, elementToCheck, VisitedMatchType::Disabled, PseudoId::None); |
| hasContext.inFunctionalPseudoClass = true; |
| hasContext.pseudoElementEffective = false; |
| |
| PseudoIdSet ignorePseudoElements; |
| auto result = matchRecursively(hasCheckingContext, hasContext, ignorePseudoElements).match == Match::SelectorMatches; |
| |
| if (hasCheckingContext.matchedInsideScope) |
| matchedInsideScope = true; |
| |
| return result; |
| }; |
| |
| auto checkDescendants = [&](const Element& descendantRoot) { |
| for (auto it = descendantsOfType<Element>(descendantRoot).begin(); it;) { |
| auto& descendant = *it; |
| if (cache && descendant.firstElementChild()) { |
| auto key = Style::makeHasPseudoClassCacheKey(descendant, hasSelector); |
| if (cache->get(key) == Style::HasPseudoClassMatch::FailsSubtree) { |
| it.traverseNextSkippingChildren(); |
| continue; |
| } |
| } |
| if (checkRelative(descendant)) |
| return true; |
| |
| it.traverseNext(); |
| } |
| |
| return false; |
| }; |
| |
| auto match = [&] { |
| switch (matchElement) { |
| // :has(> .child) |
| case Style::MatchElement::HasChild: |
| for (auto& child : childrenOfType<Element>(element)) { |
| if (checkRelative(child)) |
| return true; |
| } |
| break; |
| // :has(.descendant) |
| case Style::MatchElement::HasDescendant: { |
| if (cache) { |
| // See if we already know this descendant selector doesn't match in this subtree. |
| for (auto* ancestor = element.parentElement(); ancestor; ancestor = ancestor->parentElement()) { |
| auto key = Style::makeHasPseudoClassCacheKey(*ancestor, hasSelector); |
| if (cache->get(key) == Style::HasPseudoClassMatch::FailsSubtree) |
| return false; |
| } |
| } |
| if (checkDescendants(element)) |
| return true; |
| |
| break; |
| } |
| // FIXME: Add a separate case for adjacent combinator. |
| // :has(+ .sibling) |
| // :has(~ .sibling) |
| case Style::MatchElement::HasSibling: |
| for (auto* sibling = element.nextElementSibling(); sibling; sibling = sibling->nextElementSibling()) { |
| if (checkRelative(*sibling)) |
| return true; |
| } |
| break; |
| // FIXME: Add a separate case for adjacent combinator. |
| // :has(+ .sibling .descendant) |
| // :has(~ .sibling .descendant) |
| case Style::MatchElement::HasSiblingDescendant: |
| for (auto* sibling = element.nextElementSibling(); sibling; sibling = sibling->nextElementSibling()) { |
| if (checkDescendants(*sibling)) |
| return true; |
| } |
| break; |
| |
| default: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| return false; |
| }; |
| |
| auto result = match(); |
| |
| auto matchTypeForCache = [&] { |
| if (result) |
| return Style::HasPseudoClassMatch::Matches; |
| if (matchedInsideScope) |
| return Style::HasPseudoClassMatch::Fails; |
| return Style::HasPseudoClassMatch::FailsSubtree; |
| }; |
| |
| if (cache) |
| cache->add(Style::makeHasPseudoClassCacheKey(element, hasSelector), matchTypeForCache()); |
| |
| return result; |
| } |
| |
| 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; |
| } |
| |
| } |
