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Node retargeting algorithm

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Fernando Jiménez Moreno 2019-01-28 15:48:12 +01:00
parent 441357b74e
commit ea69bbc75b
1 changed files with 31 additions and 0 deletions
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31
components/script/dom/node.rs
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@ -640,6 +640,10 @@ impl Node {
parent.ancestors().any(|ancestor| &*ancestor == self)
}
fn is_shadow_including_inclusive_ancestor_of(&self, node: &Node) -> bool {
node.shadow_including_inclusive_ancestors().any(|ancestor| &*ancestor == self)
}
pub fn following_siblings(&self) -> impl Iterator<Item = DomRoot<Node>> {
SimpleNodeIterator {
current: self.GetNextSibling(),
@ -905,6 +909,20 @@ impl Node {
}
}
/// https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-ancestor
pub fn shadow_including_inclusive_ancestors(&self) -> impl Iterator<Item = DomRoot<Node>> {
SimpleNodeIterator {
current: Some(DomRoot::from_ref(self)),
next_node: |n| {
if let Some(shadow_root) = n.downcast::<ShadowRoot>() {
Some(DomRoot::from_ref(shadow_root.Host().upcast::<Node>()))
} else {
n.GetParentNode()
}
},
}
}
pub fn owner_doc(&self) -> DomRoot<Document> {
self.owner_doc.get().unwrap()
}
@ -1087,6 +1105,19 @@ impl Node {
None
}
}
/// https://dom.spec.whatwg.org/#retarget
pub fn retarget(&self, a: &Node, b: &Node) -> DomRoot<Node> {
let mut a = DomRoot::from_ref(&*a);
loop {
let a_root = a.GetRootNode(&GetRootNodeOptions::empty());
if !a_root.is::<ShadowRoot>() || a_root.is_shadow_including_inclusive_ancestor_of(b) {
return DomRoot::from_ref(&a);
}
a = DomRoot::from_ref(a_root.downcast::<ShadowRoot>().unwrap().Host().upcast::<Node>());
}
}
}
/// Iterate through `nodes` until we find a `Node` that is not in `not_in`