jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
3 * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
4 *
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8#include <LibWeb/DOM/LiveNodeList.h>
9#include <LibWeb/DOM/Node.h>
10
11namespace Web::DOM {
12
13WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeList>> LiveNodeList::create(JS::Realm& realm, Node& root, Function<bool(Node const&)> filter)
14{
15 return MUST_OR_THROW_OOM(realm.heap().allocate<LiveNodeList>(realm, realm, root, move(filter)));
16}
17
18LiveNodeList::LiveNodeList(JS::Realm& realm, Node& root, Function<bool(Node const&)> filter)
19 : NodeList(realm)
20 , m_root(root)
21 , m_filter(move(filter))
22{
23}
24
25LiveNodeList::~LiveNodeList() = default;
26
27void LiveNodeList::visit_edges(Cell::Visitor& visitor)
28{
29 Base::visit_edges(visitor);
30 visitor.visit(m_root.ptr());
31}
32
33JS::MarkedVector<Node*> LiveNodeList::collection() const
34{
35 JS::MarkedVector<Node*> nodes(heap());
36 m_root->for_each_in_inclusive_subtree([&](auto& node) {
37 if (m_filter(node))
38 nodes.append(const_cast<Node*>(&node));
39
40 return IterationDecision::Continue;
41 });
42 return nodes;
43}
44
45// https://dom.spec.whatwg.org/#dom-nodelist-length
46u32 LiveNodeList::length() const
47{
48 return collection().size();
49}
50
51// https://dom.spec.whatwg.org/#dom-nodelist-item
52Node const* LiveNodeList::item(u32 index) const
53{
54 // The item(index) method must return the indexth node in the collection. If there is no indexth node in the collection, then the method must return null.
55 auto nodes = collection();
56 if (index >= nodes.size())
57 return nullptr;
58 return nodes[index];
59}
60
61// https://dom.spec.whatwg.org/#ref-for-dfn-supported-property-indices
62bool LiveNodeList::is_supported_property_index(u32 index) const
63{
64 // The object’s supported property indices are the numbers in the range zero to one less than the number of nodes represented by the collection.
65 // If there are no such elements, then there are no supported property indices.
66 return index < length();
67}
68
69}