| /* |
| * 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, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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. |
| * |
| * 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 "core/css/SelectorChecker.h" |
| |
| #include "HTMLNames.h" |
| #include "core/css/CSSSelector.h" |
| #include "core/css/CSSSelectorList.h" |
| #include "core/css/SiblingTraversalStrategies.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/Element.h" |
| #include "core/dom/FullscreenElementStack.h" |
| #include "core/dom/NodeRenderStyle.h" |
| #include "core/dom/Text.h" |
| #include "core/dom/shadow/InsertionPoint.h" |
| #include "core/dom/shadow/ShadowRoot.h" |
| #include "core/editing/FrameSelection.h" |
| #include "core/html/HTMLAnchorElement.h" |
| #include "core/html/HTMLDocument.h" |
| #include "core/html/HTMLFrameElementBase.h" |
| #include "core/html/HTMLInputElement.h" |
| #include "core/html/HTMLOptGroupElement.h" |
| #include "core/html/HTMLOptionElement.h" |
| #include "core/html/parser/HTMLParserIdioms.h" |
| #include "core/inspector/InspectorInstrumentation.h" |
| #include "core/page/FocusController.h" |
| #include "core/frame/Frame.h" |
| #include "core/platform/ScrollableArea.h" |
| #include "core/platform/ScrollbarTheme.h" |
| #include "core/rendering/RenderObject.h" |
| #include "core/rendering/RenderScrollbar.h" |
| #include "core/rendering/style/RenderStyle.h" |
| |
| #include "core/html/track/WebVTTElement.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| SelectorChecker::SelectorChecker(Document& document, Mode mode) |
| : m_strictParsing(!document.inQuirksMode()) |
| , m_documentIsHTML(document.isHTMLDocument()) |
| , m_mode(mode) |
| { |
| } |
| |
| static bool matchesCustomPseudoElement(const Element* element, const CSSSelector* selector) |
| { |
| ShadowRoot* root = element->containingShadowRoot(); |
| if (!root) |
| return false; |
| |
| if (selector->pseudoType() != CSSSelector::PseudoPart) { |
| const AtomicString& pseudoId = selector->pseudoType() == CSSSelector::PseudoWebKitCustomElement ? element->shadowPseudoId() : element->pseudo(); |
| if (pseudoId != selector->value()) |
| return false; |
| if (selector->pseudoType() == CSSSelector::PseudoWebKitCustomElement && root->type() != ShadowRoot::UserAgentShadowRoot) |
| return false; |
| return true; |
| } |
| |
| if (element->part() != selector->argument()) |
| return false; |
| if (selector->isMatchUserAgentOnly() && root->type() != ShadowRoot::UserAgentShadowRoot) |
| return false; |
| return true; |
| } |
| |
| Element* SelectorChecker::parentElement(const SelectorCheckingContext& context) const |
| { |
| // CrossesBoundary means we don't care any context.scope. So we can walk up from a shadow root to its shadow host. |
| if ((context.behaviorAtBoundary & SelectorChecker::BoundaryBehaviorMask) == SelectorChecker::CrossesBoundary) |
| return context.element->parentOrShadowHostElement(); |
| |
| // If context.scope is not a shadow host, we cannot walk up from a shadow root to its shadow host. |
| if (!(context.behaviorAtBoundary & SelectorChecker::ScopeIsShadowHost)) |
| return context.element->parentElement(); |
| |
| // If behaviorAtBoundary is StaysWithInTreeScope, we cannot walk up from a shadow root to its shadow host. |
| return (context.behaviorAtBoundary & SelectorChecker::BoundaryBehaviorMask) != SelectorChecker::StaysWithinTreeScope ? context.element->parentOrShadowHostElement() : context.element->parentElement(); |
| } |
| |
| bool SelectorChecker::scopeContainsLastMatchedElement(const SelectorCheckingContext& context) const |
| { |
| if (!(context.behaviorAtBoundary & SelectorChecker::ScopeContainsLastMatchedElement)) |
| return true; |
| |
| ASSERT(context.scope); |
| // If behaviorAtBoundary is not ScopeIsShadowHost, we can use "contains". |
| if (!(context.behaviorAtBoundary & SelectorChecker::ScopeIsShadowHost)) |
| return context.scope->contains(context.element); |
| |
| // If a given element is scope, i.e. shadow host, matches. |
| if (context.element == context.scope) |
| return true; |
| |
| ShadowRoot* root = context.element->containingShadowRoot(); |
| if (!root) |
| return false; |
| |
| // If a host of the containing shadow root is scope, matches. |
| return root->host() == context.scope; |
| } |
| |
| // 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 |
| template<typename SiblingTraversalStrategy> |
| SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext& context, PseudoId& dynamicPseudo, const SiblingTraversalStrategy& siblingTraversalStrategy) const |
| { |
| // first selector has to match |
| if (!checkOne(context, siblingTraversalStrategy)) |
| return SelectorFailsLocally; |
| |
| if (context.selector->m_match == CSSSelector::PseudoElement) { |
| if (context.selector->isCustomPseudoElement()) { |
| if (!matchesCustomPseudoElement(context.element, context.selector)) |
| return SelectorFailsLocally; |
| } else if (context.selector->isContentPseudoElement()) { |
| if (!context.element->isInShadowTree() || !context.element->isInsertionPoint()) |
| return SelectorFailsLocally; |
| } else { |
| if ((!context.elementStyle && m_mode == ResolvingStyle) || m_mode == QueryingRules) |
| return SelectorFailsLocally; |
| |
| PseudoId pseudoId = CSSSelector::pseudoId(context.selector->pseudoType()); |
| if (pseudoId == FIRST_LETTER) |
| context.element->document().styleEngine()->setUsesFirstLetterRules(true); |
| if (pseudoId != NOPSEUDO && m_mode != SharingRules) |
| dynamicPseudo = pseudoId; |
| } |
| } |
| |
| // The rest of the selectors has to match |
| CSSSelector::Relation relation = context.selector->relation(); |
| |
| // Prepare next selector |
| const CSSSelector* historySelector = context.selector->tagHistory(); |
| if (!historySelector) |
| return scopeContainsLastMatchedElement(context) ? SelectorMatches : SelectorFailsLocally; |
| |
| SelectorCheckingContext nextContext(context); |
| nextContext.selector = historySelector; |
| |
| PseudoId ignoreDynamicPseudo = NOPSEUDO; |
| if (relation != CSSSelector::SubSelector) { |
| // Abort if the next selector would exceed the scope. |
| if (context.element == context.scope && (context.behaviorAtBoundary & BoundaryBehaviorMask) != StaysWithinTreeScope) |
| return SelectorFailsCompletely; |
| |
| // Bail-out if this selector is irrelevant for the pseudoId |
| if (context.pseudoId != NOPSEUDO && context.pseudoId != dynamicPseudo) |
| return SelectorFailsCompletely; |
| |
| // Disable :visited matching when we see the first link or try to match anything else than an ancestors. |
| if (!context.isSubSelector && (context.element->isLink() || (relation != CSSSelector::Descendant && relation != CSSSelector::Child))) |
| nextContext.visitedMatchType = VisitedMatchDisabled; |
| |
| nextContext.pseudoId = NOPSEUDO; |
| } |
| |
| switch (relation) { |
| case CSSSelector::Descendant: |
| if (context.selector->relationIsAffectedByPseudoContent()) { |
| for (Element* element = context.element; element; element = element->parentElement()) { |
| if (matchForShadowDistributed(element, siblingTraversalStrategy, ignoreDynamicPseudo, nextContext) == SelectorMatches) |
| return SelectorMatches; |
| } |
| return SelectorFailsCompletely; |
| } |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| for (nextContext.element = parentElement(context); nextContext.element; nextContext.element = parentElement(nextContext)) { |
| Match match = this->match(nextContext, ignoreDynamicPseudo, siblingTraversalStrategy); |
| if (match == SelectorMatches || match == SelectorFailsCompletely) |
| return match; |
| if (nextContext.element == nextContext.scope && (nextContext.behaviorAtBoundary & BoundaryBehaviorMask) != StaysWithinTreeScope) |
| return SelectorFailsCompletely; |
| } |
| return SelectorFailsCompletely; |
| case CSSSelector::Child: |
| { |
| if (context.selector->relationIsAffectedByPseudoContent()) |
| return matchForShadowDistributed(context.element, siblingTraversalStrategy, ignoreDynamicPseudo, nextContext); |
| |
| nextContext.element = parentElement(context); |
| if (!nextContext.element) |
| return SelectorFailsCompletely; |
| |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| return match(nextContext, ignoreDynamicPseudo, siblingTraversalStrategy); |
| } |
| case CSSSelector::DirectAdjacent: |
| if (m_mode == ResolvingStyle) { |
| if (Element* parent = parentElement(context)) |
| parent->setChildrenAffectedByDirectAdjacentRules(); |
| } |
| nextContext.element = context.element->previousElementSibling(); |
| if (!nextContext.element) |
| return SelectorFailsAllSiblings; |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| return match(nextContext, ignoreDynamicPseudo, siblingTraversalStrategy); |
| |
| case CSSSelector::IndirectAdjacent: |
| if (m_mode == ResolvingStyle) { |
| if (Element* parent = parentElement(context)) |
| parent->setChildrenAffectedByForwardPositionalRules(); |
| } |
| nextContext.element = context.element->previousElementSibling(); |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| for (; nextContext.element; nextContext.element = nextContext.element->previousElementSibling()) { |
| Match match = this->match(nextContext, ignoreDynamicPseudo, siblingTraversalStrategy); |
| if (match == SelectorMatches || match == SelectorFailsAllSiblings || match == SelectorFailsCompletely) |
| return match; |
| }; |
| return 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 = dynamicPseudo != NOPSEUDO && (context.scrollbar || dynamicPseudo == SCROLLBAR_CORNER || dynamicPseudo == RESIZER); |
| nextContext.hasSelectionPseudo = dynamicPseudo == SELECTION; |
| if ((context.elementStyle || m_mode == CollectingRules || m_mode == QueryingRules) && dynamicPseudo != NOPSEUDO |
| && !nextContext.hasSelectionPseudo |
| && !(nextContext.hasScrollbarPseudo && nextContext.selector->m_match == CSSSelector::PseudoClass)) |
| return SelectorFailsCompletely; |
| nextContext.isSubSelector = true; |
| return match(nextContext, dynamicPseudo, siblingTraversalStrategy); |
| |
| case CSSSelector::ShadowPseudo: |
| case CSSSelector::ChildTree: |
| { |
| // If we're in the same tree-scope as the scoping element, then following a shadow descendant combinator would escape that and thus the scope. |
| if (context.scope && context.scope->treeScope() == context.element->treeScope() && (context.behaviorAtBoundary & BoundaryBehaviorMask) != StaysWithinTreeScope) |
| return SelectorFailsCompletely; |
| |
| Element* shadowHost = context.element->shadowHost(); |
| if (!shadowHost) |
| return SelectorFailsCompletely; |
| nextContext.element = shadowHost; |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| return this->match(nextContext, ignoreDynamicPseudo, siblingTraversalStrategy); |
| } |
| |
| case CSSSelector::DescendantTree: |
| { |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| for (nextContext.element = parentElement(context); nextContext.element; nextContext.element = parentElement(nextContext)) { |
| Match match = this->match(nextContext, ignoreDynamicPseudo, siblingTraversalStrategy); |
| if (match == SelectorMatches || match == SelectorFailsCompletely) |
| return match; |
| if (nextContext.element == nextContext.scope && (nextContext.behaviorAtBoundary & BoundaryBehaviorMask) != StaysWithinTreeScope) |
| return SelectorFailsCompletely; |
| } |
| return SelectorFailsCompletely; |
| } |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return SelectorFailsCompletely; |
| } |
| |
| template<typename SiblingTraversalStrategy> |
| SelectorChecker::Match SelectorChecker::matchForShadowDistributed(const Element* element, const SiblingTraversalStrategy& siblingTraversalStrategy, PseudoId& dynamicPseudo, SelectorCheckingContext& nextContext) const |
| { |
| Vector<InsertionPoint*, 8> insertionPoints; |
| collectInsertionPointsWhereNodeIsDistributed(element, insertionPoints); |
| for (size_t i = 0; i < insertionPoints.size(); ++i) { |
| nextContext.element = insertionPoints[i]; |
| nextContext.isSubSelector = false; |
| nextContext.elementStyle = 0; |
| if (match(nextContext, dynamicPseudo, siblingTraversalStrategy) == SelectorMatches) |
| return SelectorMatches; |
| } |
| return SelectorFailsCompletely; |
| } |
| |
| static inline bool containsHTMLSpace(const AtomicString& string) |
| { |
| for (unsigned i = 0; i < string.length(); i++) |
| if (isHTMLSpace<UChar>(string[i])) |
| return true; |
| return false; |
| } |
| |
| static bool attributeValueMatches(const Attribute* attributeItem, CSSSelector::Match match, const AtomicString& selectorValue, bool caseSensitive) |
| { |
| const AtomicString& value = attributeItem->value(); |
| if (value.isNull()) |
| return false; |
| |
| switch (match) { |
| case CSSSelector::Exact: |
| if (caseSensitive ? selectorValue != value : !equalIgnoringCase(selectorValue, value)) |
| return false; |
| break; |
| case CSSSelector::List: |
| { |
| // Ignore empty selectors or selectors containing HTML spaces |
| if (selectorValue.isEmpty() || containsHTMLSpace(selectorValue)) |
| return false; |
| |
| unsigned startSearchAt = 0; |
| while (true) { |
| size_t foundPos = value.find(selectorValue, startSearchAt, caseSensitive); |
| if (foundPos == kNotFound) |
| return false; |
| if (!foundPos || isHTMLSpace<UChar>(value[foundPos - 1])) { |
| unsigned endStr = foundPos + selectorValue.length(); |
| if (endStr == value.length() || isHTMLSpace<UChar>(value[endStr])) |
| break; // We found a match. |
| } |
| |
| // No match. Keep looking. |
| startSearchAt = foundPos + 1; |
| } |
| break; |
| } |
| case CSSSelector::Contain: |
| if (!value.contains(selectorValue, caseSensitive) || selectorValue.isEmpty()) |
| return false; |
| break; |
| case CSSSelector::Begin: |
| if (!value.startsWith(selectorValue, caseSensitive) || selectorValue.isEmpty()) |
| return false; |
| break; |
| case CSSSelector::End: |
| if (!value.endsWith(selectorValue, caseSensitive) || selectorValue.isEmpty()) |
| return false; |
| break; |
| case CSSSelector::Hyphen: |
| if (value.length() < selectorValue.length()) |
| return false; |
| if (!value.startsWith(selectorValue, caseSensitive)) |
| return false; |
| // It they start the same, check for exact match or following '-': |
| if (value.length() != selectorValue.length() && value[selectorValue.length()] != '-') |
| return false; |
| break; |
| case CSSSelector::PseudoClass: |
| case CSSSelector::PseudoElement: |
| default: |
| break; |
| } |
| |
| return true; |
| } |
| |
| static bool anyAttributeMatches(Element* element, CSSSelector::Match match, const QualifiedName& selectorAttr, const AtomicString& selectorValue, bool caseSensitive) |
| { |
| ASSERT(element->hasAttributesWithoutUpdate()); |
| for (size_t i = 0; i < element->attributeCount(); ++i) { |
| const Attribute* attributeItem = element->attributeItem(i); |
| |
| if (!attributeItem->matches(selectorAttr)) |
| continue; |
| |
| if (attributeValueMatches(attributeItem, match, selectorValue, caseSensitive)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| template<typename SiblingTraversalStrategy> |
| bool SelectorChecker::checkOne(const SelectorCheckingContext& context, const SiblingTraversalStrategy& siblingTraversalStrategy) const |
| { |
| Element* const & element = context.element; |
| const CSSSelector* const & selector = context.selector; |
| ASSERT(element); |
| ASSERT(selector); |
| bool elementIsHostInItsShadowTree = isHostInItsShadowTree(element, context.behaviorAtBoundary, context.scope); |
| |
| if (selector->m_match == CSSSelector::Tag) |
| return SelectorChecker::tagMatches(element, selector->tagQName(), elementIsHostInItsShadowTree ? MatchingHostInItsShadowTree : MatchingElement); |
| |
| if (selector->m_match == CSSSelector::Class) |
| return element->hasClass() && element->classNames().contains(selector->value()) && !elementIsHostInItsShadowTree; |
| |
| if (selector->m_match == CSSSelector::Id) |
| return element->hasID() && element->idForStyleResolution() == selector->value() && !elementIsHostInItsShadowTree; |
| |
| if (selector->isAttributeSelector()) { |
| const QualifiedName& attr = selector->attribute(); |
| |
| if (!element->hasAttributes() || elementIsHostInItsShadowTree) |
| return false; |
| |
| bool caseSensitive = !m_documentIsHTML || HTMLDocument::isCaseSensitiveAttribute(attr); |
| |
| if (!anyAttributeMatches(element, static_cast<CSSSelector::Match>(selector->m_match), attr, selector->value(), caseSensitive)) |
| return false; |
| } |
| |
| if (selector->m_match == CSSSelector::PseudoClass) { |
| // Handle :not up front. |
| if (selector->pseudoType() == CSSSelector::PseudoNot) { |
| SelectorCheckingContext subContext(context); |
| subContext.isSubSelector = true; |
| ASSERT(selector->selectorList()); |
| for (subContext.selector = selector->selectorList()->first(); subContext.selector; subContext.selector = subContext.selector->tagHistory()) { |
| // :not cannot nest. I don't really know why this is a |
| // restriction in CSS3, but it is, so let's honor it. |
| // the parser enforces that this never occurs |
| ASSERT(subContext.selector->pseudoType() != CSSSelector::PseudoNot); |
| // We select between :visited and :link when applying. We don't know which one applied (or not) yet. |
| if (subContext.selector->pseudoType() == CSSSelector::PseudoVisited || (subContext.selector->pseudoType() == CSSSelector::PseudoLink && subContext.visitedMatchType == VisitedMatchEnabled)) |
| return true; |
| if (!checkOne(subContext, DOMSiblingTraversalStrategy())) |
| return true; |
| } |
| } else 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). |
| return checkScrollbarPseudoClass(context, &element->document(), selector); |
| } else if (context.hasSelectionPseudo) { |
| if (selector->pseudoType() == CSSSelector::PseudoWindowInactive) |
| return !element->document().page()->focusController().isActive(); |
| } |
| |
| // Normal element pseudo class checking. |
| switch (selector->pseudoType()) { |
| // Pseudo classes: |
| case CSSSelector::PseudoNot: |
| break; // Already handled up above. |
| case CSSSelector::PseudoEmpty: |
| { |
| bool result = true; |
| for (Node* n = element->firstChild(); n; n = n->nextSibling()) { |
| if (n->isElementNode()) { |
| result = false; |
| break; |
| } |
| if (n->isTextNode()) { |
| Text* textNode = toText(n); |
| if (!textNode->data().isEmpty()) { |
| result = false; |
| break; |
| } |
| } |
| } |
| if (m_mode == ResolvingStyle) { |
| element->setStyleAffectedByEmpty(); |
| if (context.elementStyle) |
| context.elementStyle->setEmptyState(result); |
| else if (element->renderStyle() && (element->document().styleEngine()->usesSiblingRules() || element->renderStyle()->unique())) |
| element->renderStyle()->setEmptyState(result); |
| } |
| return result; |
| } |
| case CSSSelector::PseudoFirstChild: |
| // first-child matches the first child that is an element |
| if (Element* parent = element->parentElement()) { |
| bool result = siblingTraversalStrategy.isFirstChild(element); |
| if (m_mode == ResolvingStyle) { |
| RenderStyle* childStyle = context.elementStyle ? context.elementStyle : element->renderStyle(); |
| parent->setChildrenAffectedByFirstChildRules(); |
| if (result && childStyle) |
| childStyle->setFirstChildState(); |
| } |
| return result; |
| } |
| break; |
| case CSSSelector::PseudoFirstOfType: |
| // first-of-type matches the first element of its type |
| if (Element* parent = element->parentElement()) { |
| bool result = siblingTraversalStrategy.isFirstOfType(element, element->tagQName()); |
| if (m_mode == ResolvingStyle) |
| parent->setChildrenAffectedByForwardPositionalRules(); |
| return result; |
| } |
| break; |
| case CSSSelector::PseudoLastChild: |
| // last-child matches the last child that is an element |
| if (Element* parent = element->parentElement()) { |
| bool result = parent->isFinishedParsingChildren() && siblingTraversalStrategy.isLastChild(element); |
| if (m_mode == ResolvingStyle) { |
| RenderStyle* childStyle = context.elementStyle ? context.elementStyle : element->renderStyle(); |
| parent->setChildrenAffectedByLastChildRules(); |
| if (result && childStyle) |
| childStyle->setLastChildState(); |
| } |
| return result; |
| } |
| break; |
| case CSSSelector::PseudoLastOfType: |
| // last-of-type matches the last element of its type |
| if (Element* parent = element->parentElement()) { |
| if (m_mode == ResolvingStyle) |
| parent->setChildrenAffectedByBackwardPositionalRules(); |
| if (!parent->isFinishedParsingChildren()) |
| return false; |
| return siblingTraversalStrategy.isLastOfType(element, element->tagQName()); |
| } |
| break; |
| case CSSSelector::PseudoOnlyChild: |
| if (Element* parent = element->parentElement()) { |
| bool firstChild = siblingTraversalStrategy.isFirstChild(element); |
| bool onlyChild = firstChild && parent->isFinishedParsingChildren() && siblingTraversalStrategy.isLastChild(element); |
| if (m_mode == ResolvingStyle) { |
| RenderStyle* childStyle = context.elementStyle ? context.elementStyle : element->renderStyle(); |
| parent->setChildrenAffectedByFirstChildRules(); |
| parent->setChildrenAffectedByLastChildRules(); |
| if (firstChild && childStyle) |
| childStyle->setFirstChildState(); |
| if (onlyChild && childStyle) |
| childStyle->setLastChildState(); |
| } |
| return onlyChild; |
| } |
| break; |
| case CSSSelector::PseudoOnlyOfType: |
| // FIXME: This selector is very slow. |
| if (Element* parent = element->parentElement()) { |
| if (m_mode == ResolvingStyle) { |
| parent->setChildrenAffectedByForwardPositionalRules(); |
| parent->setChildrenAffectedByBackwardPositionalRules(); |
| } |
| if (!parent->isFinishedParsingChildren()) |
| return false; |
| return siblingTraversalStrategy.isFirstOfType(element, element->tagQName()) && siblingTraversalStrategy.isLastOfType(element, element->tagQName()); |
| } |
| break; |
| case CSSSelector::PseudoNthChild: |
| if (!selector->parseNth()) |
| break; |
| if (Element* parent = element->parentElement()) { |
| int count = 1 + siblingTraversalStrategy.countElementsBefore(element); |
| if (m_mode == ResolvingStyle) { |
| RenderStyle* childStyle = context.elementStyle ? context.elementStyle : element->renderStyle(); |
| element->setChildIndex(count); |
| if (childStyle) |
| childStyle->setUnique(); |
| parent->setChildrenAffectedByForwardPositionalRules(); |
| } |
| |
| if (selector->matchNth(count)) |
| return true; |
| } |
| break; |
| case CSSSelector::PseudoNthOfType: |
| if (!selector->parseNth()) |
| break; |
| if (Element* parent = element->parentElement()) { |
| int count = 1 + siblingTraversalStrategy.countElementsOfTypeBefore(element, element->tagQName()); |
| if (m_mode == ResolvingStyle) |
| parent->setChildrenAffectedByForwardPositionalRules(); |
| |
| if (selector->matchNth(count)) |
| return true; |
| } |
| break; |
| case CSSSelector::PseudoNthLastChild: |
| if (!selector->parseNth()) |
| break; |
| if (Element* parent = element->parentElement()) { |
| if (m_mode == ResolvingStyle) |
| parent->setChildrenAffectedByBackwardPositionalRules(); |
| if (!parent->isFinishedParsingChildren()) |
| return false; |
| int count = 1 + siblingTraversalStrategy.countElementsAfter(element); |
| if (selector->matchNth(count)) |
| return true; |
| } |
| break; |
| case CSSSelector::PseudoNthLastOfType: |
| if (!selector->parseNth()) |
| break; |
| if (Element* parent = element->parentElement()) { |
| if (m_mode == ResolvingStyle) |
| parent->setChildrenAffectedByBackwardPositionalRules(); |
| if (!parent->isFinishedParsingChildren()) |
| return false; |
| |
| int count = 1 + siblingTraversalStrategy.countElementsOfTypeAfter(element, element->tagQName()); |
| if (selector->matchNth(count)) |
| return true; |
| } |
| break; |
| case CSSSelector::PseudoTarget: |
| if (element == element->document().cssTarget()) |
| return true; |
| break; |
| case CSSSelector::PseudoAny: |
| { |
| SelectorCheckingContext subContext(context); |
| subContext.isSubSelector = true; |
| PseudoId ignoreDynamicPseudo = NOPSEUDO; |
| ASSERT(selector->selectorList()); |
| for (subContext.selector = selector->selectorList()->first(); subContext.selector; subContext.selector = CSSSelectorList::next(subContext.selector)) { |
| if (match(subContext, ignoreDynamicPseudo, siblingTraversalStrategy) == SelectorMatches) |
| return true; |
| } |
| } |
| break; |
| case CSSSelector::PseudoAutofill: |
| if (!element || !element->isFormControlElement()) |
| break; |
| return toHTMLFormControlElement(element)->isAutofilled(); |
| case CSSSelector::PseudoAnyLink: |
| case CSSSelector::PseudoLink: |
| // :visited and :link matches are separated later when applying the style. Here both classes match all links... |
| return element->isLink(); |
| case CSSSelector::PseudoVisited: |
| // ...except if :visited matching is disabled for ancestor/sibling matching. |
| return element->isLink() && context.visitedMatchType == VisitedMatchEnabled; |
| case CSSSelector::PseudoDrag: |
| if (m_mode == ResolvingStyle) { |
| if (context.elementStyle) |
| context.elementStyle->setAffectedByDrag(); |
| else |
| element->setChildrenAffectedByDrag(true); |
| } |
| if (element->renderer() && element->renderer()->isDragging()) |
| return true; |
| break; |
| case CSSSelector::PseudoFocus: |
| return matchesFocusPseudoClass(element); |
| case CSSSelector::PseudoHover: |
| // If we're in quirks mode, then hover should never match anchors with no |
| // href and *:hover should not match anything. This is important for sites like wsj.com. |
| if (m_strictParsing || context.isSubSelector || (selector->m_match == CSSSelector::Tag && selector->tagQName() != anyQName() && !isHTMLAnchorElement(element)) || element->isLink()) { |
| if (m_mode == ResolvingStyle) { |
| if (context.elementStyle) |
| context.elementStyle->setAffectedByHover(); |
| else |
| element->setChildrenAffectedByHover(true); |
| } |
| if (element->hovered() || InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoHover)) |
| return true; |
| } |
| break; |
| case CSSSelector::PseudoActive: |
| // If we're in quirks mode, then :active should never match anchors with no |
| // href and *:active should not match anything. |
| if (m_strictParsing || context.isSubSelector || (selector->m_match == CSSSelector::Tag && selector->tagQName() != anyQName() && !isHTMLAnchorElement(element)) || element->isLink()) { |
| if (m_mode == ResolvingStyle) { |
| if (context.elementStyle) |
| context.elementStyle->setAffectedByActive(); |
| else |
| element->setChildrenAffectedByActive(true); |
| } |
| if (element->active() || InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoActive)) |
| return true; |
| } |
| break; |
| case CSSSelector::PseudoEnabled: |
| if (element && (element->isFormControlElement() || element->hasTagName(optionTag) || isHTMLOptGroupElement(element))) |
| return !element->isDisabledFormControl(); |
| break; |
| case CSSSelector::PseudoFullPageMedia: |
| return element && element->document().isMediaDocument(); |
| break; |
| case CSSSelector::PseudoDefault: |
| return element && element->isDefaultButtonForForm(); |
| case CSSSelector::PseudoDisabled: |
| if (element && (element->isFormControlElement() || element->hasTagName(optionTag) || isHTMLOptGroupElement(element))) |
| return element->isDisabledFormControl(); |
| break; |
| case CSSSelector::PseudoReadOnly: |
| return element && element->matchesReadOnlyPseudoClass(); |
| case CSSSelector::PseudoReadWrite: |
| return element && element->matchesReadWritePseudoClass(); |
| case CSSSelector::PseudoOptional: |
| return element && element->isOptionalFormControl(); |
| case CSSSelector::PseudoRequired: |
| return element && element->isRequiredFormControl(); |
| case CSSSelector::PseudoValid: |
| if (!element) |
| return false; |
| element->document().setContainsValidityStyleRules(); |
| return element->willValidate() && element->isValidFormControlElement(); |
| case CSSSelector::PseudoInvalid: |
| if (!element) |
| return false; |
| element->document().setContainsValidityStyleRules(); |
| return element->willValidate() && !element->isValidFormControlElement(); |
| case CSSSelector::PseudoChecked: |
| { |
| if (!element) |
| break; |
| if (element->hasTagName(inputTag)) { |
| HTMLInputElement* inputElement = toHTMLInputElement(element); |
| // Even though WinIE allows checked and indeterminate to |
| // co-exist, the CSS selector spec says that you can't be |
| // both checked and indeterminate. We will behave like WinIE |
| // behind the scenes and just obey the CSS spec here in the |
| // test for matching the pseudo. |
| if (inputElement->shouldAppearChecked() && !inputElement->shouldAppearIndeterminate()) |
| return true; |
| } else if (element->hasTagName(optionTag) && toHTMLOptionElement(element)->selected()) |
| return true; |
| break; |
| } |
| case CSSSelector::PseudoIndeterminate: |
| return element && element->shouldAppearIndeterminate(); |
| case CSSSelector::PseudoRoot: |
| if (element == element->document().documentElement()) |
| return true; |
| break; |
| case CSSSelector::PseudoLang: |
| { |
| AtomicString value; |
| if (element->isWebVTTElement()) |
| value = toWebVTTElement(element)->language(); |
| else |
| value = element->computeInheritedLanguage(); |
| const AtomicString& argument = selector->argument(); |
| if (value.isEmpty() || !value.startsWith(argument, false)) |
| break; |
| if (value.length() != argument.length() && value[argument.length()] != '-') |
| break; |
| return true; |
| } |
| case CSSSelector::PseudoFullScreen: |
| // While a Document is in the fullscreen state, and the document's current fullscreen |
| // element is an element in the document, the 'full-screen' pseudoclass applies to |
| // that element. Also, an <iframe>, <object> or <embed> element whose child browsing |
| // context's Document is in the fullscreen state has the 'full-screen' pseudoclass applied. |
| if (element->isFrameElementBase() && element->containsFullScreenElement()) |
| return true; |
| if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(&element->document())) { |
| if (!fullscreen->webkitIsFullScreen()) |
| return false; |
| return element == fullscreen->webkitCurrentFullScreenElement(); |
| } |
| return false; |
| case CSSSelector::PseudoFullScreenAncestor: |
| return element->containsFullScreenElement(); |
| case CSSSelector::PseudoFullScreenDocument: |
| // While a Document is in the fullscreen state, the 'full-screen-document' pseudoclass applies |
| // to all elements of that Document. |
| if (!FullscreenElementStack::isFullScreen(&element->document())) |
| return false; |
| return true; |
| case CSSSelector::PseudoSeamlessDocument: |
| // While a document is rendered in a seamless iframe, the 'seamless-document' pseudoclass applies |
| // to all elements of that Document. |
| return element->document().shouldDisplaySeamlesslyWithParent(); |
| case CSSSelector::PseudoInRange: |
| if (!element) |
| return false; |
| element->document().setContainsValidityStyleRules(); |
| return element->isInRange(); |
| case CSSSelector::PseudoOutOfRange: |
| if (!element) |
| return false; |
| element->document().setContainsValidityStyleRules(); |
| return element->isOutOfRange(); |
| case CSSSelector::PseudoFutureCue: |
| return (element->isWebVTTElement() && !toWebVTTElement(element)->isPastNode()); |
| case CSSSelector::PseudoPastCue: |
| return (element->isWebVTTElement() && toWebVTTElement(element)->isPastNode()); |
| |
| case CSSSelector::PseudoScope: |
| { |
| const Node* contextualReferenceNode = !context.scope || (context.behaviorAtBoundary & BoundaryBehaviorMask) == CrossesBoundary ? element->document().documentElement() : context.scope; |
| if (element == contextualReferenceNode) |
| return true; |
| break; |
| } |
| |
| case CSSSelector::PseudoUnresolved: |
| if (element->isUnresolvedCustomElement()) |
| return true; |
| break; |
| |
| case CSSSelector::PseudoHost: |
| { |
| // :host only matches a shadow host when :host is in a shadow tree of the shadow host. |
| if (!context.scope || !(context.behaviorAtBoundary & ScopeIsShadowHost) || context.scope != element) |
| return false; |
| ASSERT(element->shadow()); |
| |
| // For empty parameter case, i.e. just :host or :host(). |
| if (!selector->selectorList()) |
| return true; |
| |
| SelectorCheckingContext subContext(context); |
| subContext.isSubSelector = true; |
| subContext.behaviorAtBoundary = CrossesBoundary; |
| subContext.scope = 0; |
| // Use NodeRenderingTraversal to traverse a composed ancestor list of a given element. |
| for (Element* nextElement = NodeRenderingTraversal::parentElement(element); nextElement; nextElement = NodeRenderingTraversal::parentElement(nextElement)) { |
| // If one of simple selectors matches an element, returns SelectorMatches. Just "OR". |
| for (subContext.selector = selector->selectorList()->first(); subContext.selector; subContext.selector = CSSSelectorList::next(subContext.selector)) { |
| PseudoId ignoreDynamicPseudo = NOPSEUDO; |
| subContext.element = nextElement; |
| if (match(subContext, ignoreDynamicPseudo, siblingTraversalStrategy) == SelectorMatches) |
| return true; |
| } |
| } |
| } |
| break; |
| |
| case CSSSelector::PseudoHorizontal: |
| case CSSSelector::PseudoVertical: |
| case CSSSelector::PseudoDecrement: |
| case CSSSelector::PseudoIncrement: |
| case CSSSelector::PseudoStart: |
| case CSSSelector::PseudoEnd: |
| case CSSSelector::PseudoDoubleButton: |
| case CSSSelector::PseudoSingleButton: |
| case CSSSelector::PseudoNoButton: |
| case CSSSelector::PseudoCornerPresent: |
| return false; |
| |
| case CSSSelector::PseudoUnknown: |
| case CSSSelector::PseudoNotParsed: |
| default: |
| ASSERT_NOT_REACHED(); |
| break; |
| } |
| return false; |
| } |
| else if (selector->m_match == CSSSelector::PseudoElement && selector->pseudoType() == CSSSelector::PseudoCue) { |
| SelectorCheckingContext subContext(context); |
| subContext.isSubSelector = true; |
| subContext.behaviorAtBoundary = StaysWithinTreeScope; |
| |
| PseudoId ignoreDynamicPseudo = NOPSEUDO; |
| const CSSSelector* const & selector = context.selector; |
| for (subContext.selector = selector->selectorList()->first(); subContext.selector; subContext.selector = CSSSelectorList::next(subContext.selector)) { |
| if (match(subContext, ignoreDynamicPseudo, siblingTraversalStrategy) == SelectorMatches) |
| return true; |
| } |
| return false; |
| } |
| // ### add the rest of the checks... |
| return true; |
| } |
| |
| bool SelectorChecker::checkScrollbarPseudoClass(const SelectorCheckingContext& context, Document* document, const CSSSelector* selector) const |
| { |
| RenderScrollbar* scrollbar = context.scrollbar; |
| ScrollbarPart part = context.scrollbarPart; |
| |
| // FIXME: This is a temporary hack for resizers and scrollbar corners. Eventually :window-inactive should become a real |
| // pseudo class and just apply to everything. |
| if (selector->pseudoType() == CSSSelector::PseudoWindowInactive) |
| return !document->page()->focusController().isActive(); |
| |
| if (!scrollbar) |
| return false; |
| |
| ASSERT(selector->m_match == CSSSelector::PseudoClass); |
| switch (selector->pseudoType()) { |
| case CSSSelector::PseudoEnabled: |
| return scrollbar->enabled(); |
| case CSSSelector::PseudoDisabled: |
| return !scrollbar->enabled(); |
| case CSSSelector::PseudoHover: |
| { |
| ScrollbarPart hoveredPart = scrollbar->hoveredPart(); |
| if (part == ScrollbarBGPart) |
| return hoveredPart != NoPart; |
| if (part == TrackBGPart) |
| return hoveredPart == BackTrackPart || hoveredPart == ForwardTrackPart || hoveredPart == ThumbPart; |
| return part == hoveredPart; |
| } |
| case CSSSelector::PseudoActive: |
| { |
| ScrollbarPart pressedPart = scrollbar->pressedPart(); |
| if (part == ScrollbarBGPart) |
| return pressedPart != NoPart; |
| if (part == TrackBGPart) |
| return pressedPart == BackTrackPart || pressedPart == ForwardTrackPart || pressedPart == ThumbPart; |
| return part == pressedPart; |
| } |
| case CSSSelector::PseudoHorizontal: |
| return scrollbar->orientation() == HorizontalScrollbar; |
| case CSSSelector::PseudoVertical: |
| return scrollbar->orientation() == VerticalScrollbar; |
| case CSSSelector::PseudoDecrement: |
| return part == BackButtonStartPart || part == BackButtonEndPart || part == BackTrackPart; |
| case CSSSelector::PseudoIncrement: |
| return part == ForwardButtonStartPart || part == ForwardButtonEndPart || part == ForwardTrackPart; |
| case CSSSelector::PseudoStart: |
| return part == BackButtonStartPart || part == ForwardButtonStartPart || part == BackTrackPart; |
| case CSSSelector::PseudoEnd: |
| return part == BackButtonEndPart || part == ForwardButtonEndPart || part == ForwardTrackPart; |
| case CSSSelector::PseudoDoubleButton: |
| { |
| ScrollbarButtonsPlacement buttonsPlacement = scrollbar->theme()->buttonsPlacement(); |
| if (part == BackButtonStartPart || part == ForwardButtonStartPart || part == BackTrackPart) |
| return buttonsPlacement == ScrollbarButtonsDoubleStart || buttonsPlacement == ScrollbarButtonsDoubleBoth; |
| if (part == BackButtonEndPart || part == ForwardButtonEndPart || part == ForwardTrackPart) |
| return buttonsPlacement == ScrollbarButtonsDoubleEnd || buttonsPlacement == ScrollbarButtonsDoubleBoth; |
| return false; |
| } |
| case CSSSelector::PseudoSingleButton: |
| { |
| ScrollbarButtonsPlacement buttonsPlacement = scrollbar->theme()->buttonsPlacement(); |
| if (part == BackButtonStartPart || part == ForwardButtonEndPart || part == BackTrackPart || part == ForwardTrackPart) |
| return buttonsPlacement == ScrollbarButtonsSingle; |
| return false; |
| } |
| case CSSSelector::PseudoNoButton: |
| { |
| ScrollbarButtonsPlacement buttonsPlacement = scrollbar->theme()->buttonsPlacement(); |
| if (part == BackTrackPart) |
| return buttonsPlacement == ScrollbarButtonsNone || buttonsPlacement == ScrollbarButtonsDoubleEnd; |
| if (part == ForwardTrackPart) |
| return buttonsPlacement == ScrollbarButtonsNone || buttonsPlacement == ScrollbarButtonsDoubleStart; |
| return false; |
| } |
| case CSSSelector::PseudoCornerPresent: |
| return scrollbar->scrollableArea()->isScrollCornerVisible(); |
| 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()) { |
| switch (selector->pseudoType()) { |
| case CSSSelector::PseudoNot: |
| { |
| // :not(:visited) is equivalent to :link. Parser enforces that :not can't nest. |
| ASSERT(selector->selectorList()); |
| for (const CSSSelector* subSelector = selector->selectorList()->first(); subSelector; subSelector = subSelector->tagHistory()) { |
| CSSSelector::PseudoType subType = subSelector->pseudoType(); |
| if (subType == CSSSelector::PseudoVisited) |
| linkMatchType &= ~SelectorChecker::MatchVisited; |
| else if (subType == CSSSelector::PseudoLink) |
| linkMatchType &= ~SelectorChecker::MatchLink; |
| } |
| } |
| break; |
| case CSSSelector::PseudoLink: |
| linkMatchType &= ~SelectorChecker::MatchVisited; |
| break; |
| case CSSSelector::PseudoVisited: |
| linkMatchType &= ~SelectorChecker::MatchLink; |
| break; |
| default: |
| // We don't support :link and :visited inside :-webkit-any. |
| break; |
| } |
| CSSSelector::Relation relation = selector->relation(); |
| if (relation == CSSSelector::SubSelector) |
| continue; |
| if (relation != CSSSelector::Descendant && relation != CSSSelector::Child) |
| return linkMatchType; |
| if (linkMatchType != MatchAll) |
| return linkMatchType; |
| } |
| return linkMatchType; |
| } |
| |
| bool SelectorChecker::isFrameFocused(const Element* element) |
| { |
| return element->document().frame() && element->document().frame()->selection().isFocusedAndActive(); |
| } |
| |
| bool SelectorChecker::matchesFocusPseudoClass(const Element* element) |
| { |
| if (InspectorInstrumentation::forcePseudoState(const_cast<Element*>(element), CSSSelector::PseudoFocus)) |
| return true; |
| return element->focused() && isFrameFocused(element); |
| } |
| |
| template |
| SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, PseudoId&, const DOMSiblingTraversalStrategy&) const; |
| |
| template |
| SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, PseudoId&, const ShadowDOMSiblingTraversalStrategy&) const; |
| |
| } |
