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Optimise get_root_element for elements in documents

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This commit is contained in:
Iszak Bryan 2016-01-03 01:07:00 +00:00
parent 618c1070cc
commit c02a56c01a
1 changed files with 13 additions and 5 deletions
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18
components/script/dom/element.rs
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@ -12,6 +12,7 @@ use dom::attr::AttrValue;
use dom::attr::{Attr, AttrHelpersForLayout};
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::AttrBinding::AttrMethods;
use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
use dom::bindings::codegen::Bindings::ElementBinding;
use dom::bindings::codegen::Bindings::ElementBinding::ElementMethods;
use dom::bindings::codegen::Bindings::EventBinding::EventMethods;
@ -772,11 +773,18 @@ impl Element {
// https://html.spec.whatwg.org/multipage/#root-element
pub fn get_root_element(&self) -> Root<Element> {
self.upcast::<Node>()
.inclusive_ancestors()
.filter_map(Root::downcast)
.last()
.expect("We know inclusive_ancestors will return `self` which is an element")
if self.node.is_in_doc() {
self.upcast::<Node>()
.owner_doc()
.GetDocumentElement()
.unwrap()
} else {
self.upcast::<Node>()
.inclusive_ancestors()
.filter_map(Root::downcast)
.last()
.expect("We know inclusive_ancestors will return `self` which is an element")
}
}
// https://dom.spec.whatwg.org/#locate-a-namespace-prefix