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LibWeb: Make LiveNodeList faster when it only cares about children

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Same optimization as HTMLCollection, ported to LiveNodeList.
This commit is contained in:
Andreas Kling 2023-05-23 12:28:16 +02:00
parent fe92b54137
commit fa25f70086
3 changed files with 27 additions and 13 deletions
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18
Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
View file

@ -10,15 +10,16 @@
namespace Web::DOM {
WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeList>> LiveNodeList::create(JS::Realm& realm, Node& root, Function<bool(Node const&)> filter)
WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeList>> LiveNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
{
return MUST_OR_THROW_OOM(realm.heap().allocate<LiveNodeList>(realm, realm, root, move(filter)));
return MUST_OR_THROW_OOM(realm.heap().allocate<LiveNodeList>(realm, realm, root, scope, move(filter)));
}
LiveNodeList::LiveNodeList(JS::Realm& realm, Node& root, Function<bool(Node const&)> filter)
LiveNodeList::LiveNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
: NodeList(realm)
, m_root(root)
, m_filter(move(filter))
, m_scope(scope)
{
}
@ -33,12 +34,19 @@ void LiveNodeList::visit_edges(Cell::Visitor& visitor)
JS::MarkedVector<Node*> LiveNodeList::collection() const
{
JS::MarkedVector<Node*> nodes(heap());
m_root->for_each_in_inclusive_subtree([&](auto& node) {
if (m_scope == Scope::Descendants) {
m_root->for_each_in_subtree([&](auto& node) {
if (m_filter(node))
nodes.append(const_cast<Node*>(&node));
return IterationDecision::Continue;
});
} else {
m_root->for_each_child([&](auto& node) {
if (m_filter(node))
nodes.append(const_cast<Node*>(&node));
return IterationDecision::Continue;
});
}
return nodes;
}

10
Userland/Libraries/LibWeb/DOM/LiveNodeList.h
View file

@ -18,7 +18,12 @@ class LiveNodeList final : public NodeList {
WEB_PLATFORM_OBJECT(LiveNodeList, NodeList);
public:
static WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeList>> create(JS::Realm&, Node& root, Function<bool(Node const&)> filter);
enum class Scope {
Children,
Descendants,
};
static WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeList>> create(JS::Realm&, Node& root, Scope, Function<bool(Node const&)> filter);
virtual ~LiveNodeList() override;
virtual u32 length() const override;
@ -27,7 +32,7 @@ public:
virtual bool is_supported_property_index(u32) const override;
private:
LiveNodeList(JS::Realm&, Node& root, Function<bool(Node const&)> filter);
LiveNodeList(JS::Realm&, Node& root, Scope, Function<bool(Node const&)> filter);
virtual void visit_edges(Cell::Visitor&) override;
@ -35,6 +40,7 @@ private:
JS::NonnullGCPtr<Node> m_root;
Function<bool(Node const&)> m_filter;
Scope m_scope { Scope::Descendants };
};
}

4
Userland/Libraries/LibWeb/DOM/Node.cpp
View file

@ -932,8 +932,8 @@ Element* Node::parent_or_shadow_host_element()
JS::NonnullGCPtr<NodeList> Node::child_nodes()
{
if (!m_child_nodes) {
m_child_nodes = LiveNodeList::create(realm(), *this, [this](auto& node) {
return is_parent_of(node);
m_child_nodes = LiveNodeList::create(realm(), *this, LiveNodeList::Scope::Children, [](auto&) {
return true;
}).release_value_but_fixme_should_propagate_errors();
}
return *m_child_nodes;