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style: Skip matching :nth-child if element is the root of anonymous subtree

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This implement the logic in Gecko's nsNthIndexCache::GetNthIndex().

MozReview-Commit-ID: 8lzK9iIbfzo
This commit is contained in:
Ting-Yu Lin 2017-08-15 20:35:08 +08:00
parent dc654c9912
commit 0e82ca1d3a
3 changed files with 21 additions and 2 deletions
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13
components/style/gecko/wrapper.rs
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@ -729,6 +729,12 @@ impl<'le> GeckoElement<'le> {
debug!("(Element not styled, discarding hints)");
}
}
/// This logic is duplicated in Gecko's nsIContent::IsRootOfAnonymousSubtree.
fn is_root_of_anonymous_subtree(&self) -> bool {
use gecko_bindings::structs::NODE_IS_ANONYMOUS_ROOT;
self.flags() & (NODE_IS_ANONYMOUS_ROOT as u32) != 0
}
}
/// Converts flags from the layout used by rust-selectors to the layout used
@ -1970,9 +1976,12 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
node.owner_doc().mType == structs::root::nsIDocument_Type::eHTML
}
fn ignores_nth_child_selectors(&self) -> bool {
self.is_root_of_anonymous_subtree()
}
fn blocks_ancestor_combinators(&self) -> bool {
use gecko_bindings::structs::NODE_IS_ANONYMOUS_ROOT;
if self.flags() & (NODE_IS_ANONYMOUS_ROOT as u32) == 0 {
if !self.is_root_of_anonymous_subtree() {
return false
}