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/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "PseudoClassChangeInvalidation.h"
#include "ElementChildIterator.h"
#include "ElementRareData.h"
#include "StyleInvalidationFunctions.h"
namespace WebCore {
namespace Style {
Vector<PseudoClassInvalidationKey, 4> makePseudoClassInvalidationKeys(CSSSelector::PseudoClassType pseudoClass, const Element& element)
{
Vector<PseudoClassInvalidationKey, 4> keys;
if (!element.idForStyleResolution().isEmpty())
keys.append(makePseudoClassInvalidationKey(pseudoClass, InvalidationKeyType::Id, element.idForStyleResolution()));
if (element.hasClass()) {
auto classCount = element.classNames().size();
for (size_t i = 0; i < classCount; ++i)
keys.append(makePseudoClassInvalidationKey(pseudoClass, InvalidationKeyType::Class, element.classNames()[i]));
}
keys.append(makePseudoClassInvalidationKey(pseudoClass, InvalidationKeyType::Tag, element.localName().convertToASCIILowercase()));
keys.append(makePseudoClassInvalidationKey(pseudoClass, InvalidationKeyType::Universal));
return keys;
};
void PseudoClassChangeInvalidation::computeInvalidation(CSSSelector::PseudoClassType pseudoClass, bool value, InvalidationScope invalidationScope)
{
bool shouldInvalidateCurrent = false;
bool mayAffectStyleInShadowTree = false;
traverseRuleFeatures(m_element, [&] (const RuleFeatureSet& features, bool mayAffectShadowTree) {
if (mayAffectShadowTree && features.pseudoClassTypes.contains(pseudoClass))
mayAffectStyleInShadowTree = true;
if (m_element.shadowRoot() && features.pseudoClassesAffectingHost.contains(pseudoClass))
shouldInvalidateCurrent = true;
});
if (mayAffectStyleInShadowTree) {
// FIXME: We should do fine-grained invalidation for shadow tree.
m_element.invalidateStyleForSubtree();
}
if (shouldInvalidateCurrent)
m_element.invalidateStyle();
for (auto& key : makePseudoClassInvalidationKeys(pseudoClass, m_element))
collectRuleSets(key, value, invalidationScope);
}
void PseudoClassChangeInvalidation::collectRuleSets(const PseudoClassInvalidationKey& key, bool value, InvalidationScope invalidationScope)
{
auto& ruleSets = m_element.styleResolver().ruleSets();
auto* invalidationRuleSets = ruleSets.pseudoClassInvalidationRuleSets(key);
if (!invalidationRuleSets)
return;
for (auto& invalidationRuleSet : *invalidationRuleSets) {
// For focus/hover we flip the whole ancestor chain. We only need to do deep invalidation traversal in the change root.
auto shouldInvalidate = [&] {
bool invalidatesAllDescendants = invalidationRuleSet.matchElement == MatchElement::Ancestor && isUniversalInvalidation(key);
switch (invalidationScope) {
case InvalidationScope::All:
return true;
case InvalidationScope::SelfChildrenAndSiblings:
return !invalidatesAllDescendants;
case InvalidationScope::Descendants:
return invalidatesAllDescendants;
}
ASSERT_NOT_REACHED();
return true;
}();
if (!shouldInvalidate)
continue;
bool invalidateBeforeChange = invalidationRuleSet.isNegation == IsNegation::Yes ? value : !value;
if (invalidateBeforeChange)
Invalidator::addToMatchElementRuleSets(m_beforeChangeRuleSets, invalidationRuleSet);
else
Invalidator::addToMatchElementRuleSets(m_afterChangeRuleSets, invalidationRuleSet);
}
}
void PseudoClassChangeInvalidation::invalidateBeforeChange()
{
Invalidator::invalidateWithMatchElementRuleSets(m_element, m_beforeChangeRuleSets);
}
void PseudoClassChangeInvalidation::invalidateAfterChange()
{
Invalidator::invalidateWithMatchElementRuleSets(m_element, m_afterChangeRuleSets);
}
}
}
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