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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005-2019 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) 2012 Google Inc. 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 "RuleData.h"
#include "CSSFontSelector.h"
#include "CSSKeyframesRule.h"
#include "CSSSelector.h"
#include "CSSSelectorList.h"
#include "CommonAtomStrings.h"
#include "DocumentInlines.h"
#include "HTMLNames.h"
#include "ScriptExecutionContext.h"
#include "SecurityOrigin.h"
#include "SelectorChecker.h"
#include "SelectorFilter.h"
#include "StyleResolver.h"
#include "StyleRule.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include "UserAgentParts.h"
namespace WebCore {
namespace Style {
using namespace HTMLNames;
struct SameSizeAsRuleData {
void* a;
unsigned b;
unsigned c;
unsigned d[4];
};
static_assert(sizeof(RuleData) == sizeof(SameSizeAsRuleData), "RuleData should stay small");
static inline MatchBasedOnRuleHash computeMatchBasedOnRuleHash(const CSSSelector& selector)
{
if (selector.tagHistory())
return MatchBasedOnRuleHash::None;
if (selector.match() == CSSSelector::Match::Tag) {
const QualifiedName& tagQualifiedName = selector.tagQName();
const AtomString& selectorNamespace = tagQualifiedName.namespaceURI();
if (selectorNamespace == starAtom() || selectorNamespace == xhtmlNamespaceURI) {
if (tagQualifiedName == anyQName())
return MatchBasedOnRuleHash::Universal;
return MatchBasedOnRuleHash::ClassC;
}
return MatchBasedOnRuleHash::None;
}
if (SelectorChecker::isCommonPseudoClassSelector(&selector))
return MatchBasedOnRuleHash::ClassB;
if (selector.match() == CSSSelector::Match::Id)
return MatchBasedOnRuleHash::ClassA;
if (selector.match() == CSSSelector::Match::Class)
return MatchBasedOnRuleHash::ClassB;
// FIXME: Valueless [attribute] case can be handled here too.
return MatchBasedOnRuleHash::None;
}
static bool selectorCanMatchPseudoElement(const CSSSelector& rootSelector)
{
const CSSSelector* selector = &rootSelector;
do {
if (selector->matchesPseudoElement())
return true;
if (const CSSSelectorList* selectorList = selector->selectorList()) {
for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
if (selectorCanMatchPseudoElement(*subSelector))
return true;
}
}
selector = selector->tagHistory();
} while (selector);
return false;
}
static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
{
// These are explicitly tested for equality in canShareStyleWithElement.
return attribute == typeAttr || attribute == readonlyAttr;
}
static bool computeContainsUncommonAttributeSelector(const CSSSelector& rootSelector, bool matchesRightmostElement = true)
{
const CSSSelector* selector = &rootSelector;
do {
if (selector->isAttributeSelector()) {
// FIXME: considering non-rightmost simple selectors is necessary because of the style sharing of cousins.
// It is a primitive solution which disable a lot of style sharing on pages that rely on attributes for styling.
// We should investigate better ways of doing this.
if (!isCommonAttributeSelectorAttribute(selector->attribute()) || !matchesRightmostElement)
return true;
}
if (const CSSSelectorList* selectorList = selector->selectorList()) {
for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
if (computeContainsUncommonAttributeSelector(*subSelector, matchesRightmostElement))
return true;
}
}
if (selector->relation() != CSSSelector::Relation::Subselector)
matchesRightmostElement = false;
selector = selector->tagHistory();
} while (selector);
return false;
}
static inline PropertyAllowlist determinePropertyAllowlist(const CSSSelector* selector)
{
for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
#if ENABLE(VIDEO)
// Property allow-list for `::cue`:
if (component->match() == CSSSelector::Match::PseudoElement && component->pseudoElement() == CSSSelector::PseudoElement::UserAgentPart && component->value() == UserAgentParts::cue())
return PropertyAllowlist::Cue;
// Property allow-list for `::cue(selector)`:
if (component->match() == CSSSelector::Match::PseudoElement && component->pseudoElement() == CSSSelector::PseudoElement::Cue)
return PropertyAllowlist::CueSelector;
// Property allow-list for '::-internal-cue-background':
if (component->match() == CSSSelector::Match::PseudoElement && component->pseudoElement() == CSSSelector::PseudoElement::UserAgentPart && component->value() == UserAgentParts::internalCueBackground())
return PropertyAllowlist::CueBackground;
#endif
if (component->match() == CSSSelector::Match::PseudoElement && component->pseudoElement() == CSSSelector::PseudoElement::Marker)
return propertyAllowlistForPseudoId(PseudoId::Marker);
if (const auto* selectorList = selector->selectorList()) {
for (const auto* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
auto allowlistType = determinePropertyAllowlist(subSelector);
if (allowlistType != PropertyAllowlist::None)
return allowlistType;
}
}
}
return PropertyAllowlist::None;
}
RuleData::RuleData(const StyleRule& styleRule, unsigned selectorIndex, unsigned selectorListIndex, unsigned position, IsStartingStyle isStartingStyle)
: m_styleRule(&styleRule)
, m_selectorIndex(selectorIndex)
, m_selectorListIndex(selectorListIndex)
, m_position(position)
, m_matchBasedOnRuleHash(enumToUnderlyingType(computeMatchBasedOnRuleHash(*selector())))
, m_canMatchPseudoElement(selectorCanMatchPseudoElement(*selector()))
, m_containsUncommonAttributeSelector(computeContainsUncommonAttributeSelector(*selector()))
, m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
, m_propertyAllowlist(enumToUnderlyingType(determinePropertyAllowlist(selector())))
, m_isStartingStyle(enumToUnderlyingType(isStartingStyle))
, m_isEnabled(true)
, m_descendantSelectorIdentifierHashes(SelectorFilter::collectHashes(*selector()))
{
ASSERT(m_position == position);
ASSERT(m_selectorIndex == selectorIndex);
}
} // namespace Style
} // namespace WebCore
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