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6a2a7cad61
This is mostly motivated for aesthetics, but also helps avoid some null checks when we have a NonnullGCPtr<T> or in some cases a T&.
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
/*
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* Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Heap/Heap.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibWeb/DOM/LiveNodeList.h>
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#include <LibWeb/DOM/Node.h>
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namespace Web::DOM {
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JS::NonnullGCPtr<NodeList> LiveNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
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{
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return realm.heap().allocate<LiveNodeList>(realm, realm, root, scope, move(filter));
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}
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LiveNodeList::LiveNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
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: NodeList(realm)
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, m_root(root)
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, m_filter(move(filter))
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, m_scope(scope)
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{
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}
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LiveNodeList::~LiveNodeList() = default;
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void LiveNodeList::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_root);
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}
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JS::MarkedVector<Node*> LiveNodeList::collection() const
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{
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JS::MarkedVector<Node*> nodes(heap());
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if (m_scope == Scope::Descendants) {
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m_root->for_each_in_subtree([&](auto& node) {
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if (m_filter(node))
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nodes.append(const_cast<Node*>(&node));
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return IterationDecision::Continue;
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});
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} else {
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m_root->for_each_child([&](auto& node) {
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if (m_filter(node))
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nodes.append(const_cast<Node*>(&node));
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return IterationDecision::Continue;
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});
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}
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return nodes;
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}
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Node* LiveNodeList::first_matching(Function<bool(Node const&)> const& filter) const
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{
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Node* matched_node = nullptr;
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if (m_scope == Scope::Descendants) {
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m_root->for_each_in_subtree([&](auto& node) {
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if (m_filter(node) && filter(node)) {
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matched_node = const_cast<Node*>(&node);
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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} else {
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m_root->for_each_child([&](auto& node) {
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if (m_filter(node) && filter(node)) {
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matched_node = const_cast<Node*>(&node);
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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}
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return matched_node;
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}
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// https://dom.spec.whatwg.org/#dom-nodelist-length
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u32 LiveNodeList::length() const
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{
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return collection().size();
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}
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// https://dom.spec.whatwg.org/#dom-nodelist-item
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Node const* LiveNodeList::item(u32 index) const
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{
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// 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.
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auto nodes = collection();
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if (index >= nodes.size())
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return nullptr;
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return nodes[index];
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}
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// https://dom.spec.whatwg.org/#ref-for-dfn-supported-property-indices
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bool LiveNodeList::is_supported_property_index(u32 index) const
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{
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// 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.
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// If there are no such elements, then there are no supported property indices.
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return index < length();
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}
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}
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