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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) 2013 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 "StyleScopeRuleSets.h"
#include "CSSStyleSheet.h"
#include "ExtensionStyleSheets.h"
#include "MediaQueryEvaluator.h"
#include "StyleResolver.h"
#include "StyleSheetContents.h"
namespace WebCore {
namespace Style {
ScopeRuleSets::ScopeRuleSets(Resolver& styleResolver)
: m_styleResolver(styleResolver)
{
m_authorStyle = makeUnique<RuleSet>();
m_authorStyle->disableAutoShrinkToFit();
}
ScopeRuleSets::~ScopeRuleSets()
{
RELEASE_ASSERT(!m_isInvalidatingStyleWithRuleSets);
}
RuleSet* ScopeRuleSets::userAgentMediaQueryStyle() const
{
// FIXME: We should have a separate types for document rule sets and shadow tree rule sets.
if (m_isForShadowScope)
return m_styleResolver.document().styleScope().resolver().ruleSets().userAgentMediaQueryStyle();
updateUserAgentMediaQueryStyleIfNeeded();
return m_userAgentMediaQueryStyle.get();
}
void ScopeRuleSets::updateUserAgentMediaQueryStyleIfNeeded() const
{
if (!UserAgentStyle::mediaQueryStyleSheet)
return;
auto ruleCount = UserAgentStyle::mediaQueryStyleSheet->ruleCount();
if (m_userAgentMediaQueryStyle && ruleCount == m_userAgentMediaQueryRuleCountOnUpdate)
return;
m_userAgentMediaQueryRuleCountOnUpdate = ruleCount;
#if !ASSERT_DISABLED
bool hadViewportDependentMediaQueries = m_styleResolver.hasViewportDependentMediaQueries();
#endif
// Media queries on user agent sheet need to evaluated in document context. They behave like author sheets in this respect.
auto& mediaQueryEvaluator = m_styleResolver.mediaQueryEvaluator();
m_userAgentMediaQueryStyle = makeUnique<RuleSet>();
m_userAgentMediaQueryStyle->addRulesFromSheet(*UserAgentStyle::mediaQueryStyleSheet, mediaQueryEvaluator, &m_styleResolver);
// Viewport dependent queries are currently too inefficient to allow on UA sheet.
ASSERT(!m_styleResolver.hasViewportDependentMediaQueries() || hadViewportDependentMediaQueries);
}
RuleSet* ScopeRuleSets::userStyle() const
{
if (m_usesSharedUserStyle)
return m_styleResolver.document().styleScope().resolver().ruleSets().userStyle();
return m_userStyle.get();
}
void ScopeRuleSets::initializeUserStyle()
{
auto& extensionStyleSheets = m_styleResolver.document().extensionStyleSheets();
auto& mediaQueryEvaluator = m_styleResolver.mediaQueryEvaluator();
auto tempUserStyle = makeUnique<RuleSet>();
if (CSSStyleSheet* pageUserSheet = extensionStyleSheets.pageUserSheet())
tempUserStyle->addRulesFromSheet(pageUserSheet->contents(), mediaQueryEvaluator, &m_styleResolver);
collectRulesFromUserStyleSheets(extensionStyleSheets.injectedUserStyleSheets(), *tempUserStyle, mediaQueryEvaluator);
collectRulesFromUserStyleSheets(extensionStyleSheets.documentUserStyleSheets(), *tempUserStyle, mediaQueryEvaluator);
if (tempUserStyle->ruleCount() > 0 || tempUserStyle->pageRules().size() > 0)
m_userStyle = WTFMove(tempUserStyle);
}
void ScopeRuleSets::collectRulesFromUserStyleSheets(const Vector<RefPtr<CSSStyleSheet>>& userSheets, RuleSet& userStyle, const MediaQueryEvaluator& medium)
{
for (unsigned i = 0; i < userSheets.size(); ++i) {
ASSERT(userSheets[i]->contents().isUserStyleSheet());
userStyle.addRulesFromSheet(userSheets[i]->contents(), medium, &m_styleResolver);
}
}
static std::unique_ptr<RuleSet> makeRuleSet(const Vector<RuleFeature>& rules)
{
size_t size = rules.size();
if (!size)
return nullptr;
auto ruleSet = makeUnique<RuleSet>();
for (size_t i = 0; i < size; ++i)
ruleSet->addRule(rules[i].rule, rules[i].selectorIndex, rules[i].selectorListIndex);
ruleSet->shrinkToFit();
return ruleSet;
}
void ScopeRuleSets::resetAuthorStyle()
{
m_isAuthorStyleDefined = true;
m_authorStyle = makeUnique<RuleSet>();
m_authorStyle->disableAutoShrinkToFit();
}
void ScopeRuleSets::resetUserAgentMediaQueryStyle()
{
m_userAgentMediaQueryStyle = nullptr;
}
void ScopeRuleSets::appendAuthorStyleSheets(const Vector<RefPtr<CSSStyleSheet>>& styleSheets, MediaQueryEvaluator* medium, InspectorCSSOMWrappers& inspectorCSSOMWrappers)
{
// This handles sheets added to the end of the stylesheet list only. In other cases the style resolver
// needs to be reconstructed. To handle insertions too the rule order numbers would need to be updated.
MediaQueryDynamicResults mediaQueryDynamicResults;
for (auto& cssSheet : styleSheets) {
ASSERT(!cssSheet->disabled());
if (cssSheet->mediaQueries() && !medium->evaluate(*cssSheet->mediaQueries(), &mediaQueryDynamicResults))
continue;
m_authorStyle->addRulesFromSheet(cssSheet->contents(), *medium, &m_styleResolver);
inspectorCSSOMWrappers.collectFromStyleSheetIfNeeded(cssSheet.get());
}
m_styleResolver.addMediaQueryDynamicResults(mediaQueryDynamicResults);
m_authorStyle->shrinkToFit();
collectFeatures();
}
void ScopeRuleSets::collectFeatures() const
{
RELEASE_ASSERT(!m_isInvalidatingStyleWithRuleSets);
m_features.clear();
// Collect all ids and rules using sibling selectors (:first-child and similar)
// in the current set of stylesheets. Style sharing code uses this information to reject
// sharing candidates.
if (UserAgentStyle::defaultStyle)
m_features.add(UserAgentStyle::defaultStyle->features());
m_defaultStyleVersionOnFeatureCollection = UserAgentStyle::defaultStyleVersion;
if (auto* userAgentMediaQueryStyle = this->userAgentMediaQueryStyle())
m_features.add(userAgentMediaQueryStyle->features());
if (m_authorStyle)
m_features.add(m_authorStyle->features());
if (auto* userStyle = this->userStyle())
m_features.add(userStyle->features());
m_siblingRuleSet = makeRuleSet(m_features.siblingRules);
m_uncommonAttributeRuleSet = makeRuleSet(m_features.uncommonAttributeRules);
m_classInvalidationRuleSets.clear();
m_attributeInvalidationRuleSets.clear();
m_cachedHasComplexSelectorsForStyleAttribute = WTF::nullopt;
m_features.shrinkToFit();
}
static Vector<InvalidationRuleSet>* ensureInvalidationRuleSets(const AtomString& key, HashMap<AtomString, std::unique_ptr<Vector<InvalidationRuleSet>>>& ruleSetMap, const HashMap<AtomString, std::unique_ptr<Vector<RuleFeature>>>& ruleFeatures)
{
return ruleSetMap.ensure(key, [&] () -> std::unique_ptr<Vector<InvalidationRuleSet>> {
auto* features = ruleFeatures.get(key);
if (!features)
return nullptr;
std::array<std::unique_ptr<RuleSet>, matchElementCount> matchElementArray;
std::array<Vector<const CSSSelector*>, matchElementCount> invalidationSelectorArray;
for (auto& feature : *features) {
auto arrayIndex = static_cast<unsigned>(*feature.matchElement);
auto& ruleSet = matchElementArray[arrayIndex];
if (!ruleSet)
ruleSet = makeUnique<RuleSet>();
ruleSet->addRule(feature.rule, feature.selectorIndex, feature.selectorListIndex);
if (feature.invalidationSelector)
invalidationSelectorArray[arrayIndex].append(feature.invalidationSelector);
}
auto invalidationRuleSets = makeUnique<Vector<InvalidationRuleSet>>();
for (unsigned i = 0; i < matchElementArray.size(); ++i) {
if (matchElementArray[i])
invalidationRuleSets->append({ static_cast<MatchElement>(i), WTFMove(matchElementArray[i]), WTFMove(invalidationSelectorArray[i]) });
}
return invalidationRuleSets;
}).iterator->value.get();
}
const Vector<InvalidationRuleSet>* ScopeRuleSets::classInvalidationRuleSets(const AtomString& className) const
{
return ensureInvalidationRuleSets(className, m_classInvalidationRuleSets, m_features.classRules);
}
const Vector<InvalidationRuleSet>* ScopeRuleSets::attributeInvalidationRuleSets(const AtomString& attributeName) const
{
return ensureInvalidationRuleSets(attributeName, m_attributeInvalidationRuleSets, m_features.attributeRules);
}
bool ScopeRuleSets::hasComplexSelectorsForStyleAttribute() const
{
auto compute = [&] {
auto* ruleSets = attributeInvalidationRuleSets(HTMLNames::styleAttr->localName());
if (!ruleSets)
return false;
for (auto& ruleSet : *ruleSets) {
if (ruleSet.matchElement != MatchElement::Subject)
return true;
}
return false;
};
if (!m_cachedHasComplexSelectorsForStyleAttribute)
m_cachedHasComplexSelectorsForStyleAttribute = compute();
return *m_cachedHasComplexSelectorsForStyleAttribute;
}
} // namespace Style
} // namespace WebCore