180 lines
7.1 KiB
C++
180 lines
7.1 KiB
C++
/*
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
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* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
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* Copyright (C) 2005-2019 Apple Inc. All rights reserved.
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* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
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* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
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* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
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* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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* Copyright (C) Research In Motion Limited 2011. All rights reserved.
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* Copyright (C) 2012 Google Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "RuleData.h"
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#include "CSSFontSelector.h"
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#include "CSSKeyframesRule.h"
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#include "CSSSelector.h"
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#include "CSSSelectorList.h"
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#include "HTMLNames.h"
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#include "MediaQueryEvaluator.h"
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#include "SecurityOrigin.h"
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#include "SelectorChecker.h"
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#include "SelectorFilter.h"
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#include "StyleResolver.h"
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#include "StyleRule.h"
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#include "StyleRuleImport.h"
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#include "StyleSheetContents.h"
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#if ENABLE(VIDEO)
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#include "TextTrackCue.h"
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#endif
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namespace WebCore {
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namespace Style {
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using namespace HTMLNames;
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struct SameSizeAsRuleData {
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void* a;
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unsigned b;
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unsigned c;
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unsigned d[4];
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};
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COMPILE_ASSERT(sizeof(RuleData) == sizeof(SameSizeAsRuleData), RuleData_should_stay_small);
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static inline MatchBasedOnRuleHash computeMatchBasedOnRuleHash(const CSSSelector& selector)
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{
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if (selector.tagHistory())
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return MatchBasedOnRuleHash::None;
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if (selector.match() == CSSSelector::Tag) {
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const QualifiedName& tagQualifiedName = selector.tagQName();
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const AtomString& selectorNamespace = tagQualifiedName.namespaceURI();
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if (selectorNamespace == starAtom() || selectorNamespace == xhtmlNamespaceURI) {
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if (tagQualifiedName == anyQName())
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return MatchBasedOnRuleHash::Universal;
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return MatchBasedOnRuleHash::ClassC;
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}
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return MatchBasedOnRuleHash::None;
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}
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if (SelectorChecker::isCommonPseudoClassSelector(&selector))
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return MatchBasedOnRuleHash::ClassB;
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if (selector.match() == CSSSelector::Id)
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return MatchBasedOnRuleHash::ClassA;
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if (selector.match() == CSSSelector::Class)
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return MatchBasedOnRuleHash::ClassB;
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return MatchBasedOnRuleHash::None;
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}
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static bool selectorCanMatchPseudoElement(const CSSSelector& rootSelector)
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{
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const CSSSelector* selector = &rootSelector;
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do {
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if (selector->matchesPseudoElement())
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return true;
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if (const CSSSelectorList* selectorList = selector->selectorList()) {
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for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
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if (selectorCanMatchPseudoElement(*subSelector))
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return true;
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}
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}
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selector = selector->tagHistory();
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} while (selector);
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return false;
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}
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static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
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{
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// These are explicitly tested for equality in canShareStyleWithElement.
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return attribute == typeAttr || attribute == readonlyAttr;
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}
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static bool computeContainsUncommonAttributeSelector(const CSSSelector& rootSelector, bool matchesRightmostElement = true)
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{
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const CSSSelector* selector = &rootSelector;
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do {
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if (selector->isAttributeSelector()) {
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// FIXME: considering non-rightmost simple selectors is necessary because of the style sharing of cousins.
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// It is a primitive solution which disable a lot of style sharing on pages that rely on attributes for styling.
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// We should investigate better ways of doing this.
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if (!isCommonAttributeSelectorAttribute(selector->attribute()) || !matchesRightmostElement)
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return true;
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}
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if (const CSSSelectorList* selectorList = selector->selectorList()) {
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for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
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if (computeContainsUncommonAttributeSelector(*subSelector, matchesRightmostElement))
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return true;
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}
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}
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if (selector->relation() != CSSSelector::Subselector)
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matchesRightmostElement = false;
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selector = selector->tagHistory();
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} while (selector);
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return false;
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}
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static inline PropertyAllowlistType determinePropertyAllowlistType(const CSSSelector* selector)
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{
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for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
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#if ENABLE(VIDEO)
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if (component->match() == CSSSelector::PseudoElement && (component->pseudoElementType() == CSSSelector::PseudoElementCue || component->value() == TextTrackCue::cueShadowPseudoId()))
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return PropertyAllowlistCue;
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#endif
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if (component->match() == CSSSelector::PseudoElement && component->pseudoElementType() == CSSSelector::PseudoElementMarker)
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return PropertyAllowlistMarker;
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if (const auto* selectorList = selector->selectorList()) {
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for (const auto* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
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auto allowlistType = determinePropertyAllowlistType(subSelector);
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if (allowlistType != PropertyAllowlistNone)
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return allowlistType;
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}
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}
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}
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return PropertyAllowlistNone;
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}
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RuleData::RuleData(const StyleRule& styleRule, unsigned selectorIndex, unsigned selectorListIndex, unsigned position)
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: m_styleRule(&styleRule)
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, m_selectorIndex(selectorIndex)
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, m_selectorListIndex(selectorListIndex)
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, m_position(position)
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, m_matchBasedOnRuleHash(static_cast<unsigned>(computeMatchBasedOnRuleHash(*selector())))
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, m_canMatchPseudoElement(selectorCanMatchPseudoElement(*selector()))
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, m_containsUncommonAttributeSelector(computeContainsUncommonAttributeSelector(*selector()))
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, m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
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, m_propertyAllowlistType(determinePropertyAllowlistType(selector()))
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, m_isEnabled(true)
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, m_descendantSelectorIdentifierHashes(SelectorFilter::collectHashes(*selector()))
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{
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ASSERT(m_position == position);
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ASSERT(m_selectorIndex == selectorIndex);
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}
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} // namespace Style
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} // namespace WebCore
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