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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) 2005-2014 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 "RuleSet.h"
#include "CSSFontSelector.h"
#include "CSSKeyframesRule.h"
#include "CSSSelector.h"
#include "CSSSelectorList.h"
#include "HTMLNames.h"
#include "MediaQueryEvaluator.h"
#include "SecurityOrigin.h"
#include "SelectorChecker.h"
#include "SelectorFilter.h"
#include "StyleResolver.h"
#include "StyleRule.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
#include "ViewportStyleResolver.h"
#if ENABLE(VIDEO_TRACK)
#include "TextTrackCue.h"
#endif
namespace WebCore {
using namespace HTMLNames;
// -----------------------------------------------------------------
static inline MatchBasedOnRuleHash computeMatchBasedOnRuleHash(const CSSSelector& selector)
{
if (selector.tagHistory())
return MatchBasedOnRuleHash::None;
if (selector.match() == CSSSelector::Tag) {
const QualifiedName& tagQualifiedName = selector.tagQName();
const AtomicString& 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::Id)
return MatchBasedOnRuleHash::ClassA;
if (selector.match() == CSSSelector::Class)
return MatchBasedOnRuleHash::ClassB;
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 containsUncommonAttributeSelector(const CSSSelector& rootSelector, bool matchesRightmostElement)
{
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 (containsUncommonAttributeSelector(*subSelector, matchesRightmostElement))
return true;
}
}
if (selector->relation() != CSSSelector::Subselector)
matchesRightmostElement = false;
selector = selector->tagHistory();
} while (selector);
return false;
}
static inline bool containsUncommonAttributeSelector(const CSSSelector& rootSelector)
{
return containsUncommonAttributeSelector(rootSelector, true);
}
static inline PropertyWhitelistType determinePropertyWhitelistType(const CSSSelector* selector)
{
for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
#if ENABLE(VIDEO_TRACK)
if (component->match() == CSSSelector::PseudoElement && (component->pseudoElementType() == CSSSelector::PseudoElementCue || component->value() == TextTrackCue::cueShadowPseudoId()))
return PropertyWhitelistCue;
#endif
if (component->match() == CSSSelector::PseudoElement && component->pseudoElementType() == CSSSelector::PseudoElementMarker)
return PropertyWhitelistMarker;
}
return PropertyWhitelistNone;
}
RuleData::RuleData(StyleRule* rule, unsigned selectorIndex, unsigned selectorListIndex, unsigned position)
: m_rule(rule)
, m_selectorIndex(selectorIndex)
, m_selectorListIndex(selectorListIndex)
, m_position(position)
, m_matchBasedOnRuleHash(static_cast<unsigned>(computeMatchBasedOnRuleHash(*selector())))
, m_canMatchPseudoElement(selectorCanMatchPseudoElement(*selector()))
, m_containsUncommonAttributeSelector(WebCore::containsUncommonAttributeSelector(*selector()))
, m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
, m_propertyWhitelistType(determinePropertyWhitelistType(selector()))
, m_descendantSelectorIdentifierHashes(SelectorFilter::collectHashes(*selector()))
{
ASSERT(m_position == position);
ASSERT(m_selectorIndex == selectorIndex);
}
RuleSet::RuleSet() = default;
RuleSet::~RuleSet() = default;
void RuleSet::addToRuleSet(const AtomicString& key, AtomRuleMap& map, const RuleData& ruleData)
{
if (key.isNull())
return;
auto& rules = map.add(key, nullptr).iterator->value;
if (!rules)
rules = std::make_unique<RuleDataVector>();
rules->append(ruleData);
}
static unsigned rulesCountForName(const RuleSet::AtomRuleMap& map, const AtomicString& name)
{
if (const auto* rules = map.get(name))
return rules->size();
return 0;
}
static bool isHostSelectorMatchingInShadowTree(const CSSSelector& startSelector)
{
auto* leftmostSelector = &startSelector;
bool hasDescendantOrChildRelation = false;
while (auto* previous = leftmostSelector->tagHistory()) {
hasDescendantOrChildRelation = leftmostSelector->hasDescendantOrChildRelation();
leftmostSelector = previous;
}
if (!hasDescendantOrChildRelation)
return false;
return leftmostSelector->match() == CSSSelector::PseudoClass && leftmostSelector->pseudoClassType() == CSSSelector::PseudoClassHost;
}
void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, unsigned selectorListIndex)
{
RuleData ruleData(rule, selectorIndex, selectorListIndex, m_ruleCount++);
m_features.collectFeatures(ruleData);
unsigned classBucketSize = 0;
const CSSSelector* idSelector = nullptr;
const CSSSelector* tagSelector = nullptr;
const CSSSelector* classSelector = nullptr;
const CSSSelector* linkSelector = nullptr;
const CSSSelector* focusSelector = nullptr;
const CSSSelector* hostPseudoClassSelector = nullptr;
const CSSSelector* customPseudoElementSelector = nullptr;
const CSSSelector* slottedPseudoElementSelector = nullptr;
#if ENABLE(VIDEO_TRACK)
const CSSSelector* cuePseudoElementSelector = nullptr;
#endif
const CSSSelector* selector = ruleData.selector();
do {
switch (selector->match()) {
case CSSSelector::Id:
idSelector = selector;
break;
case CSSSelector::Class: {
auto& className = selector->value();
if (!classSelector) {
classSelector = selector;
classBucketSize = rulesCountForName(m_classRules, className);
} else if (classBucketSize) {
unsigned newClassBucketSize = rulesCountForName(m_classRules, className);
if (newClassBucketSize < classBucketSize) {
classSelector = selector;
classBucketSize = newClassBucketSize;
}
}
break;
}
case CSSSelector::Tag:
if (selector->tagQName().localName() != starAtom())
tagSelector = selector;
break;
case CSSSelector::PseudoElement:
switch (selector->pseudoElementType()) {
case CSSSelector::PseudoElementUserAgentCustom:
case CSSSelector::PseudoElementWebKitCustom:
case CSSSelector::PseudoElementWebKitCustomLegacyPrefixed:
customPseudoElementSelector = selector;
break;
case CSSSelector::PseudoElementSlotted:
slottedPseudoElementSelector = selector;
break;
#if ENABLE(VIDEO_TRACK)
case CSSSelector::PseudoElementCue:
cuePseudoElementSelector = selector;
break;
#endif
default:
break;
}
break;
case CSSSelector::PseudoClass:
switch (selector->pseudoClassType()) {
case CSSSelector::PseudoClassLink:
case CSSSelector::PseudoClassVisited:
case CSSSelector::PseudoClassAnyLink:
case CSSSelector::PseudoClassAnyLinkDeprecated:
linkSelector = selector;
break;
case CSSSelector::PseudoClassFocus:
focusSelector = selector;
break;
case CSSSelector::PseudoClassHost:
hostPseudoClassSelector = selector;
break;
default:
break;
}
break;
case CSSSelector::Unknown:
case CSSSelector::Exact:
case CSSSelector::Set:
case CSSSelector::List:
case CSSSelector::Hyphen:
case CSSSelector::Contain:
case CSSSelector::Begin:
case CSSSelector::End:
case CSSSelector::PagePseudoClass:
break;
}
if (selector->relation() != CSSSelector::Subselector)
break;
selector = selector->tagHistory();
} while (selector);
#if ENABLE(VIDEO_TRACK)
if (cuePseudoElementSelector) {
m_cuePseudoRules.append(ruleData);
return;
}
#endif
if (slottedPseudoElementSelector) {
// ::slotted pseudo elements work accross shadow boundary making filtering difficult.
ruleData.disableSelectorFiltering();
m_slottedPseudoElementRules.append(ruleData);
return;
}
if (customPseudoElementSelector) {
// FIXME: Custom pseudo elements are handled by the shadow tree's selector filter. It doesn't know about the main DOM.
ruleData.disableSelectorFiltering();
addToRuleSet(customPseudoElementSelector->value(), m_shadowPseudoElementRules, ruleData);
return;
}
if (!m_hasHostPseudoClassRulesMatchingInShadowTree)
m_hasHostPseudoClassRulesMatchingInShadowTree = isHostSelectorMatchingInShadowTree(*ruleData.selector());
if (hostPseudoClassSelector) {
m_hostPseudoClassRules.append(ruleData);
return;
}
if (idSelector) {
addToRuleSet(idSelector->value(), m_idRules, ruleData);
return;
}
if (classSelector) {
addToRuleSet(classSelector->value(), m_classRules, ruleData);
return;
}
if (linkSelector) {
m_linkPseudoClassRules.append(ruleData);
return;
}
if (focusSelector) {
m_focusPseudoClassRules.append(ruleData);
return;
}
if (tagSelector) {
addToRuleSet(tagSelector->tagQName().localName(), m_tagLocalNameRules, ruleData);
addToRuleSet(tagSelector->tagLowercaseLocalName(), m_tagLowercaseLocalNameRules, ruleData);
return;
}
// If we didn't find a specialized map to stick it in, file under universal rules.
m_universalRules.append(ruleData);
}
void RuleSet::addPageRule(StyleRulePage* rule)
{
m_pageRules.append(rule);
}
void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase>>& rules, const MediaQueryEvaluator& medium, StyleResolver* resolver, bool isInitiatingElementInUserAgentShadowTree)
{
for (auto& rule : rules) {
if (is<StyleRule>(*rule))
addStyleRule(downcast<StyleRule>(rule.get()));
else if (is<StyleRulePage>(*rule))
addPageRule(downcast<StyleRulePage>(rule.get()));
else if (is<StyleRuleMedia>(*rule)) {
auto& mediaRule = downcast<StyleRuleMedia>(*rule);
if ((!mediaRule.mediaQueries() || medium.evaluate(*mediaRule.mediaQueries(), resolver)))
addChildRules(mediaRule.childRules(), medium, resolver, isInitiatingElementInUserAgentShadowTree);
} else if (is<StyleRuleFontFace>(*rule) && resolver) {
// Add this font face to our set.
resolver->document().fontSelector().addFontFaceRule(downcast<StyleRuleFontFace>(*rule.get()), isInitiatingElementInUserAgentShadowTree);
resolver->invalidateMatchedPropertiesCache();
} else if (is<StyleRuleKeyframes>(*rule) && resolver)
resolver->addKeyframeStyle(downcast<StyleRuleKeyframes>(*rule));
else if (is<StyleRuleSupports>(*rule) && downcast<StyleRuleSupports>(*rule).conditionIsSupported())
addChildRules(downcast<StyleRuleSupports>(*rule).childRules(), medium, resolver, isInitiatingElementInUserAgentShadowTree);
#if ENABLE(CSS_DEVICE_ADAPTATION)
else if (is<StyleRuleViewport>(*rule) && resolver) {
resolver->viewportStyleResolver()->addViewportRule(downcast<StyleRuleViewport>(rule.get()));
}
#endif
}
}
void RuleSet::addRulesFromSheet(StyleSheetContents& sheet, const MediaQueryEvaluator& medium, StyleResolver* resolver)
{
for (auto& rule : sheet.importRules()) {
if (rule->styleSheet() && (!rule->mediaQueries() || medium.evaluate(*rule->mediaQueries(), resolver)))
addRulesFromSheet(*rule->styleSheet(), medium, resolver);
}
// FIXME: Skip Content Security Policy check when stylesheet is in a user agent shadow tree.
// See <https://bugs.webkit.org/show_bug.cgi?id=146663>.
bool isInitiatingElementInUserAgentShadowTree = false;
addChildRules(sheet.childRules(), medium, resolver, isInitiatingElementInUserAgentShadowTree);
if (m_autoShrinkToFitEnabled)
shrinkToFit();
}
void RuleSet::addStyleRule(StyleRule* rule)
{
unsigned selectorListIndex = 0;
for (size_t selectorIndex = 0; selectorIndex != notFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
addRule(rule, selectorIndex, selectorListIndex++);
}
bool RuleSet::hasShadowPseudoElementRules() const
{
if (!m_shadowPseudoElementRules.isEmpty())
return true;
#if ENABLE(VIDEO_TRACK)
if (!m_cuePseudoRules.isEmpty())
return true;
#endif
return false;
}
static inline void shrinkMapVectorsToFit(RuleSet::AtomRuleMap& map)
{
for (auto& vector : map.values())
vector->shrinkToFit();
}
void RuleSet::shrinkToFit()
{
shrinkMapVectorsToFit(m_idRules);
shrinkMapVectorsToFit(m_classRules);
shrinkMapVectorsToFit(m_tagLocalNameRules);
shrinkMapVectorsToFit(m_tagLowercaseLocalNameRules);
shrinkMapVectorsToFit(m_shadowPseudoElementRules);
m_linkPseudoClassRules.shrinkToFit();
#if ENABLE(VIDEO_TRACK)
m_cuePseudoRules.shrinkToFit();
#endif
m_hostPseudoClassRules.shrinkToFit();
m_slottedPseudoElementRules.shrinkToFit();
m_focusPseudoClassRules.shrinkToFit();
m_universalRules.shrinkToFit();
m_pageRules.shrinkToFit();
m_features.shrinkToFit();
}
} // namespace WebCore