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Support CSS shadow parts

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Basilisk-Dev 2026-05-11 19:33:30 -04:00 • committed by wuggy
commit a852c0a86a
10 changed files with 1882 additions and 29 deletions
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39
layout/style/RuleCascadeData.cpp
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@ -404,6 +404,22 @@ RuleHash::AppendUniversalRule(const RuleSelectorPair& aRuleInfo)
RuleValue(aRuleInfo, mRuleCount++, mQuirksMode));
}
static bool
SelectorContainsPseudoClass(nsCSSSelector* aSelector, CSSPseudoClassType aType)
{
for (nsCSSSelector* selector = aSelector; selector; selector = selector->mNext) {
for (nsPseudoClassList* pseudoClass = selector->mPseudoClassList;
pseudoClass;
pseudoClass = pseudoClass->mNext) {
if (pseudoClass->mType == aType) {
return true;
}
}
}
return false;
}
void
RuleHash::AppendRule(const RuleSelectorPair& aRuleInfo)
{
@ -411,7 +427,10 @@ RuleHash::AppendRule(const RuleSelectorPair& aRuleInfo)
if (selector->IsPseudoElement()) {
selector = selector->mNext;
}
if (nullptr != selector->mIDList) {
if (SelectorContainsPseudoClass(selector, CSSPseudoClassType::part)) {
AppendUniversalRule(aRuleInfo);
RULE_HASH_STAT_INCREMENT(mUniversalSelectors);
} else if (nullptr != selector->mIDList) {
AppendRuleToTable(&mIdTable, selector->mIDList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mIdSelectors);
} else if (nullptr != selector->mClassList) {
@ -452,6 +471,10 @@ LookForTargetPseudo(nsCSSSelector* aSelector,
nsRestyleHint* possibleChange)
{
if (aMatchContext->mOnlyMatchHostPseudo) {
if (SelectorContainsPseudoClass(aSelector, CSSPseudoClassType::part)) {
return true;
}
while (aSelector && aSelector->mNext != nullptr) {
aSelector = aSelector->mNext;
}
@ -502,7 +525,8 @@ ContentEnumFunc(const RuleValue& value,
data->mTreeMatchContext.SetHaveRelevantLink();
}
// XXX: Ignore the ancestor filter if we're testing the assigned slot.
bool useAncestorFilter = !(data->mTreeMatchContext.mForAssignedSlot);
bool useAncestorFilter = !(data->mTreeMatchContext.mForAssignedSlot ||
data->mTreeMatchContext.mOnlyMatchHostPseudo);
if (useAncestorFilter && ancestorFilter &&
!ancestorFilter->MightHaveMatchingAncestor<RuleValue::eMaxAncestorHashes>(
value.mAncestorSelectorHashes)) {
@ -556,9 +580,18 @@ ContentEnumFunc(const RuleValue& value,
nodeContext,
data->mTreeMatchContext,
selectorFlags)) {
Element* treeMatchStart = data->mElement;
if (SelectorContainsPseudoClass(selector, CSSPseudoClassType::part)) {
nsIContent* partHost = data->mElement->GetContainingShadowHost();
if (!partHost || !partHost->IsElement()) {
return;
}
treeMatchStart = partHost->AsElement();
}
nsCSSSelector* next = selector->mNext;
if (!next || nsCSSRuleUtils::SelectorMatchesTree(
data->mElement,
treeMatchStart,
next,
data->mTreeMatchContext,
nodeContext.mIsRelevantLink ? SelectorMatchesTreeFlags(0)