PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumeComplexSelector(CSSParserTokenRange& range)
{
OwnPtr<CSSParserSelector> selector = consumeCompoundSelector(range);
if (!selector)
return nullptr;
while (CSSSelector::Relation combinator = consumeCombinator(range)) {
OwnPtr<CSSParserSelector> nextSelector = consumeCompoundSelector(range);
if (!nextSelector)
return combinator == CSSSelector::Descendant ? selector.release() : nullptr;
CSSParserSelector* end = nextSelector.get();
while (end->tagHistory())
end = end->tagHistory();
end->setRelation(combinator);
if (selector->isContentPseudoElement())
end->setRelationIsAffectedByPseudoContent();
end->setTagHistory(selector.release());
selector = nextSelector.release();
}
return selector.release();
}
std::unique_ptr<CSSParserSelector> CSSSelectorParser::consumeComplexSelector(
CSSParserTokenRange& range) {
std::unique_ptr<CSSParserSelector> selector = consumeCompoundSelector(range);
if (!selector)
return nullptr;
unsigned previousCompoundFlags = 0;
for (CSSParserSelector* simple = selector.get();
simple && !previousCompoundFlags; simple = simple->tagHistory())
previousCompoundFlags |= extractCompoundFlags(*simple, m_context.mode());
while (CSSSelector::RelationType combinator = consumeCombinator(range)) {
std::unique_ptr<CSSParserSelector> nextSelector =
consumeCompoundSelector(range);
if (!nextSelector)
return combinator == CSSSelector::Descendant ? std::move(selector)
: nullptr;
if (previousCompoundFlags & HasPseudoElementForRightmostCompound)
return nullptr;
CSSParserSelector* end = nextSelector.get();
unsigned compoundFlags = extractCompoundFlags(*end, m_context.mode());
while (end->tagHistory()) {
end = end->tagHistory();
compoundFlags |= extractCompoundFlags(*end, m_context.mode());
}
end->setRelation(combinator);
if (previousCompoundFlags & HasContentPseudoElement)
end->setRelationIsAffectedByPseudoContent();
previousCompoundFlags = compoundFlags;
end->setTagHistory(std::move(selector));
selector = std::move(nextSelector);
}
return selector;
}
