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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, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 "core/css/RuleSet.h"
#include "HTMLNames.h"
#include "RuntimeEnabledFeatures.h"
#include "core/css/CSSFontSelector.h"
#include "core/css/CSSKeyframesRule.h"
#include "core/css/CSSSelector.h"
#include "core/css/CSSSelectorList.h"
#include "core/css/MediaQueryEvaluator.h"
#include "core/css/SelectorChecker.h"
#include "core/css/SelectorCheckerFastPath.h"
#include "core/css/SelectorFilter.h"
#include "core/css/StyleRule.h"
#include "core/css/StyleRuleImport.h"
#include "core/css/StyleSheetContents.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/html/track/TextTrackCue.h"
#include "weborigin/SecurityOrigin.h"
namespace WebCore {
using namespace HTMLNames;
// -----------------------------------------------------------------
static inline bool isDocumentScope(const ContainerNode* scope)
{
return !scope || scope->isDocumentNode();
}
static inline bool isScopingNodeInShadowTree(const ContainerNode* scopingNode)
{
return scopingNode && scopingNode->isInShadowTree();
}
static inline bool isSelectorMatchingHTMLBasedOnRuleHash(const CSSSelector* selector)
{
ASSERT(selector);
if (selector->m_match == CSSSelector::Tag) {
const AtomicString& selectorNamespace = selector->tagQName().namespaceURI();
if (selectorNamespace != starAtom && selectorNamespace != xhtmlNamespaceURI)
return false;
if (selector->relation() == CSSSelector::SubSelector)
return isSelectorMatchingHTMLBasedOnRuleHash(selector->tagHistory());
return true;
}
if (SelectorChecker::isCommonPseudoClassSelector(selector))
return true;
return selector->m_match == CSSSelector::Id || selector->m_match == CSSSelector::Class;
}
static inline bool selectorListContainsUncommonAttributeSelector(const CSSSelector* selector)
{
const CSSSelectorList* selectorList = selector->selectorList();
if (!selectorList)
return false;
for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(selector)) {
for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
if (component->isAttributeSelector())
return true;
}
}
return false;
}
static inline bool isCommonAttributeSelectorAttribute(const QualifiedName& attribute)
{
// These are explicitly tested for equality in canShareStyleWithElement.
return attribute == typeAttr || attribute == readonlyAttr;
}
static inline bool containsUncommonAttributeSelector(const CSSSelector* selector)
{
for (; selector; selector = selector->tagHistory()) {
// Allow certain common attributes (used in the default style) in the selectors that match the current element.
if (selector->isAttributeSelector() && !isCommonAttributeSelectorAttribute(selector->attribute()))
return true;
if (selectorListContainsUncommonAttributeSelector(selector))
return true;
if (selector->relation() != CSSSelector::SubSelector) {
selector = selector->tagHistory();
break;
}
}
for (; selector; selector = selector->tagHistory()) {
if (selector->isAttributeSelector())
return true;
if (selectorListContainsUncommonAttributeSelector(selector))
return true;
}
return false;
}
static inline PropertyWhitelistType determinePropertyWhitelistType(const AddRuleFlags addRuleFlags, const CSSSelector* selector)
{
if (addRuleFlags & RuleIsInRegionRule)
return PropertyWhitelistRegion;
for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
if (component->pseudoType() == CSSSelector::PseudoCue || (component->m_match == CSSSelector::PseudoElement && component->value() == TextTrackCue::cueShadowPseudoId()))
return PropertyWhitelistCue;
}
return PropertyWhitelistNone;
}
namespace {
// FIXME: Should we move this class to WTF?
template<typename T>
class TerminatedArrayBuilder {
public:
explicit TerminatedArrayBuilder(PassOwnPtr<T> array)
: m_array(array)
, m_count(0)
, m_capacity(0)
{
if (!m_array)
return;
for (T* item = m_array.get(); !item->isLastInArray(); ++item)
++m_count;
++m_count; // To count the last item itself.
m_capacity = m_count;
}
void grow(size_t count)
{
ASSERT(count);
if (!m_array) {
ASSERT(!m_count);
ASSERT(!m_capacity);
m_capacity = count;
m_array = adoptPtr(static_cast<T*>(fastMalloc(m_capacity * sizeof(T))));
return;
}
m_capacity += count;
m_array = adoptPtr(static_cast<T*>(fastRealloc(m_array.leakPtr(), m_capacity * sizeof(T))));
m_array.get()[m_count - 1].setLastInArray(false);
}
void append(const T& item)
{
RELEASE_ASSERT(m_count < m_capacity);
ASSERT(!item.isLastInArray());
m_array.get()[m_count++] = item;
}
PassOwnPtr<T> release()
{
RELEASE_ASSERT(m_count == m_capacity);
if (m_array)
m_array.get()[m_count - 1].setLastInArray(true);
assertValid();
return m_array.release();
}
private:
#ifndef NDEBUG
void assertValid()
{
for (size_t i = 0; i < m_count; ++i) {
bool isLastInArray = (i + 1 == m_count);
ASSERT(m_array.get()[i].isLastInArray() == isLastInArray);
}
}
#else
void assertValid() { }
#endif
OwnPtr<T> m_array;
size_t m_count;
size_t m_capacity;
};
}
RuleData::RuleData(StyleRule* rule, unsigned selectorIndex, unsigned position, AddRuleFlags addRuleFlags)
: m_rule(rule)
, m_selectorIndex(selectorIndex)
, m_isLastInArray(false)
, m_position(position)
, m_hasFastCheckableSelector((addRuleFlags & RuleCanUseFastCheckSelector) && SelectorCheckerFastPath::canUse(selector()))
, m_specificity(selector()->specificity())
, m_hasMultipartSelector(!!selector()->tagHistory())
, m_hasRightmostSelectorMatchingHTMLBasedOnRuleHash(isSelectorMatchingHTMLBasedOnRuleHash(selector()))
, m_containsUncommonAttributeSelector(WebCore::containsUncommonAttributeSelector(selector()))
, m_linkMatchType(SelectorChecker::determineLinkMatchType(selector()))
, m_hasDocumentSecurityOrigin(addRuleFlags & RuleHasDocumentSecurityOrigin)
, m_propertyWhitelistType(determinePropertyWhitelistType(addRuleFlags, selector()))
{
ASSERT(m_position == position);
ASSERT(m_selectorIndex == selectorIndex);
SelectorFilter::collectIdentifierHashes(selector(), m_descendantSelectorIdentifierHashes, maximumIdentifierCount);
}
static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData& ruleData)
{
bool foundSiblingSelector = false;
unsigned maxDirectAdjacentSelectors = 0;
for (const CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) {
features.collectFeaturesFromSelector(selector);
if (const CSSSelectorList* selectorList = selector->selectorList()) {
for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
// FIXME: Shouldn't this be checking subSelector->isSiblingSelector()?
if (!foundSiblingSelector && selector->isSiblingSelector())
foundSiblingSelector = true;
if (subSelector->isDirectAdjacentSelector())
maxDirectAdjacentSelectors++;
features.collectFeaturesFromSelector(subSelector);
}
} else {
if (!foundSiblingSelector && selector->isSiblingSelector())
foundSiblingSelector = true;
if (selector->isDirectAdjacentSelector())
maxDirectAdjacentSelectors++;
}
}
features.setMaxDirectAdjacentSelectors(maxDirectAdjacentSelectors);
if (foundSiblingSelector)
features.siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
if (ruleData.containsUncommonAttributeSelector())
features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
}
void RuleSet::addToRuleSet(StringImpl* key, PendingRuleMap& map, const RuleData& ruleData)
{
if (!key)
return;
OwnPtr<LinkedStack<RuleData> >& rules = map.add(key, nullptr).iterator->value;
if (!rules)
rules = adoptPtr(new LinkedStack<RuleData>);
rules->push(ruleData);
}
bool RuleSet::findBestRuleSetAndAdd(const CSSSelector* component, RuleData& ruleData)
{
if (component->m_match == CSSSelector::Id) {
addToRuleSet(component->value().impl(), ensurePendingRules()->idRules, ruleData);
return true;
}
if (component->m_match == CSSSelector::Class) {
addToRuleSet(component->value().impl(), ensurePendingRules()->classRules, ruleData);
return true;
}
if (component->isCustomPseudoElement()) {
StringImpl* pseudoValue = component->pseudoType() == CSSSelector::PseudoPart ? component->argument().impl() : component->value().impl();
addToRuleSet(pseudoValue, ensurePendingRules()->shadowPseudoElementRules, ruleData);
return true;
}
if (component->pseudoType() == CSSSelector::PseudoCue) {
m_cuePseudoRules.append(ruleData);
return true;
}
if (SelectorChecker::isCommonPseudoClassSelector(component)) {
switch (component->pseudoType()) {
case CSSSelector::PseudoLink:
case CSSSelector::PseudoVisited:
case CSSSelector::PseudoAnyLink:
m_linkPseudoClassRules.append(ruleData);
return true;
case CSSSelector::PseudoFocus:
m_focusPseudoClassRules.append(ruleData);
return true;
default:
ASSERT_NOT_REACHED();
return true;
}
}
if (component->m_match == CSSSelector::Tag) {
if (component->tagQName().localName() != starAtom) {
// If this is part of a subselector chain, recurse ahead to find a narrower set (ID/class.)
if (component->relation() == CSSSelector::SubSelector
&& (component->tagHistory()->m_match == CSSSelector::Class || component->tagHistory()->m_match == CSSSelector::Id || SelectorChecker::isCommonPseudoClassSelector(component->tagHistory()))
&& findBestRuleSetAndAdd(component->tagHistory(), ruleData))
return true;
addToRuleSet(component->tagQName().localName().impl(), ensurePendingRules()->tagRules, ruleData);
return true;
}
}
return false;
}
void RuleSet::addRule(StyleRule* rule, unsigned selectorIndex, AddRuleFlags addRuleFlags)
{
RuleData ruleData(rule, selectorIndex, m_ruleCount++, addRuleFlags);
collectFeaturesFromRuleData(m_features, ruleData);
if (!findBestRuleSetAndAdd(ruleData.selector(), ruleData)) {
// 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)
{
ensurePendingRules(); // So that m_pageRules.shrinkToFit() gets called.
m_pageRules.append(rule);
}
void RuleSet::addViewportRule(StyleRuleViewport* rule)
{
ensurePendingRules(); // So that m_viewportRules.shrinkToFit() gets called.
m_viewportRules.append(rule);
}
void RuleSet::addRegionRule(StyleRuleRegion* regionRule, bool hasDocumentSecurityOrigin, const ContainerNode* scope)
{
ensurePendingRules(); // So that m_regionSelectorsAndRuleSets.shrinkToFit() gets called.
OwnPtr<RuleSet> regionRuleSet = RuleSet::create();
// The region rule set should take into account the position inside the parent rule set.
// Otherwise, the rules inside region block might be incorrectly positioned before other similar rules from
// the stylesheet that contains the region block.
regionRuleSet->m_ruleCount = m_ruleCount;
// Collect the region rules into a rule set
// FIXME: Should this add other types of rules? (i.e. use addChildRules() directly?)
const Vector<RefPtr<StyleRuleBase> >& childRules = regionRule->childRules();
AddRuleFlags addRuleFlags = hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
addRuleFlags = static_cast<AddRuleFlags>(addRuleFlags | RuleIsInRegionRule | (!scope ? RuleCanUseFastCheckSelector : 0));
for (unsigned i = 0; i < childRules.size(); ++i) {
StyleRuleBase* regionStylingRule = childRules[i].get();
if (regionStylingRule->isStyleRule())
regionRuleSet->addStyleRule(static_cast<StyleRule*>(regionStylingRule), addRuleFlags);
}
// Update the "global" rule count so that proper order is maintained
m_ruleCount = regionRuleSet->m_ruleCount;
m_regionSelectorsAndRuleSets.append(RuleSetSelectorPair(regionRule->selectorList().first(), regionRuleSet.release()));
}
void RuleSet::addChildRules(const Vector<RefPtr<StyleRuleBase> >& rules, const MediaQueryEvaluator& medium, StyleResolver* resolver, const ContainerNode* scope, bool hasDocumentSecurityOrigin, AddRuleFlags addRuleFlags)
{
for (unsigned i = 0; i < rules.size(); ++i) {
StyleRuleBase* rule = rules[i].get();
if (rule->isStyleRule()) {
StyleRule* styleRule = static_cast<StyleRule*>(rule);
const CSSSelectorList& selectorList = styleRule->selectorList();
for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = selectorList.indexOfNextSelectorAfter(selectorIndex)) {
if (selectorList.hasCombinatorCrossingTreeBoundaryAt(selectorIndex)) {
resolver->ruleSets().treeBoundaryCrossingRules().addRule(styleRule, selectorIndex, const_cast<ContainerNode*>(scope), addRuleFlags);
} else if (selectorList.hasShadowDistributedAt(selectorIndex)) {
if (isDocumentScope(scope))
continue;
resolver->ruleSets().treeBoundaryCrossingRules().addRule(styleRule, selectorIndex, const_cast<ContainerNode*>(scope), addRuleFlags);
} else
addRule(styleRule, selectorIndex, addRuleFlags);
}
} else if (rule->isPageRule())
addPageRule(static_cast<StyleRulePage*>(rule));
else if (rule->isMediaRule()) {
StyleRuleMedia* mediaRule = static_cast<StyleRuleMedia*>(rule);
if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), resolver->viewportDependentMediaQueryResults())))
addChildRules(mediaRule->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);
} else if (rule->isFontFaceRule() && resolver) {
// Add this font face to our set.
// FIXME(BUG 72461): We don't add @font-face rules of scoped style sheets for the moment.
if (!isDocumentScope(scope))
continue;
const StyleRuleFontFace* fontFaceRule = static_cast<StyleRuleFontFace*>(rule);
resolver->fontSelector()->addFontFaceRule(fontFaceRule);
resolver->invalidateMatchedPropertiesCache();
} else if (rule->isKeyframesRule() && resolver) {
resolver->ensureScopedStyleResolver(scope)->addKeyframeStyle(static_cast<StyleRuleKeyframes*>(rule));
} else if (rule->isRegionRule() && resolver) {
// FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment.
addRegionRule(static_cast<StyleRuleRegion*>(rule), hasDocumentSecurityOrigin, scope);
} else if (rule->isHostRule() && resolver) {
if (!isScopingNodeInShadowTree(scope))
continue;
bool enabled = resolver->buildScopedStyleTreeInDocumentOrder();
resolver->setBuildScopedStyleTreeInDocumentOrder(false);
resolver->ensureScopedStyleResolver(scope->shadowHost())->addHostRule(static_cast<StyleRuleHost*>(rule), hasDocumentSecurityOrigin, scope);
resolver->setBuildScopedStyleTreeInDocumentOrder(enabled);
} else if (rule->isViewportRule()) {
// @viewport should not be scoped.
if (!isDocumentScope(scope))
continue;
addViewportRule(static_cast<StyleRuleViewport*>(rule));
}
else if (rule->isSupportsRule() && static_cast<StyleRuleSupports*>(rule)->conditionIsSupported())
addChildRules(static_cast<StyleRuleSupports*>(rule)->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);
}
}
void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, StyleResolver* resolver, const ContainerNode* scope)
{
ASSERT(sheet);
const Vector<RefPtr<StyleRuleImport> >& importRules = sheet->importRules();
for (unsigned i = 0; i < importRules.size(); ++i) {
StyleRuleImport* importRule = importRules[i].get();
if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), resolver->viewportDependentMediaQueryResults())))
addRulesFromSheet(importRule->styleSheet(), medium, resolver, scope);
}
bool hasDocumentSecurityOrigin = resolver && resolver->document().securityOrigin()->canRequest(sheet->baseURL());
AddRuleFlags addRuleFlags = static_cast<AddRuleFlags>((hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : 0) | (!scope ? RuleCanUseFastCheckSelector : 0));
addChildRules(sheet->childRules(), medium, resolver, scope, hasDocumentSecurityOrigin, addRuleFlags);
}
void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags)
{
for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
addRule(rule, selectorIndex, addRuleFlags);
}
void RuleSet::compactPendingRules(PendingRuleMap& pendingMap, CompactRuleMap& compactMap)
{
PendingRuleMap::iterator end = pendingMap.end();
for (PendingRuleMap::iterator it = pendingMap.begin(); it != end; ++it) {
OwnPtr<LinkedStack<RuleData> > pendingRules = it->value.release();
CompactRuleMap::iterator compactRules = compactMap.add(it->key, nullptr).iterator;
TerminatedArrayBuilder<RuleData> builder(compactRules->value.release());
builder.grow(pendingRules->size());
while (!pendingRules->isEmpty()) {
builder.append(pendingRules->peek());
pendingRules->pop();
}
compactRules->value = builder.release();
}
}
void RuleSet::compactRules()
{
ASSERT(m_pendingRules);
OwnPtr<PendingRuleMaps> pendingRules = m_pendingRules.release();
compactPendingRules(pendingRules->idRules, m_idRules);
compactPendingRules(pendingRules->classRules, m_classRules);
compactPendingRules(pendingRules->tagRules, m_tagRules);
compactPendingRules(pendingRules->shadowPseudoElementRules, m_shadowPseudoElementRules);
m_linkPseudoClassRules.shrinkToFit();
m_cuePseudoRules.shrinkToFit();
m_focusPseudoClassRules.shrinkToFit();
m_universalRules.shrinkToFit();
m_pageRules.shrinkToFit();
m_viewportRules.shrinkToFit();
}
} // namespace WebCore