80d6330a26
By deferring allocation of StaticNodeList objects until we know somebody actually wants the MutationRecord, we avoid a *lot* of allocation work. This shaves several seconds off of loading https://tc39.es/ecma262/ At least one other engine (WebKit) skips creating mutation records if nobody is interested, so even if this is observable somehow, we would at least match the behavior of a major engine.
110 lines
4.2 KiB
C++
110 lines
4.2 KiB
C++
/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@serenityos.org>
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* Copyright (c) 2023, Luke Wilde <lukew@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 <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/DOM/Attr.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/DOM/MutationType.h>
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#include <LibWeb/DOM/StaticNodeList.h>
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#include <LibWeb/HTML/CustomElements/CustomElementReactionNames.h>
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namespace Web::DOM {
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WebIDL::ExceptionOr<JS::NonnullGCPtr<Attr>> Attr::create(Document& document, DeprecatedFlyString local_name, DeprecatedString value, Element* owner_element)
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{
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return MUST_OR_THROW_OOM(document.heap().allocate<Attr>(document.realm(), document, QualifiedName(move(local_name), {}, {}), move(value), owner_element));
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}
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WebIDL::ExceptionOr<JS::NonnullGCPtr<Attr>> Attr::create(Document& document, QualifiedName qualified_name, DeprecatedString value, Element* owner_element)
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{
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return MUST_OR_THROW_OOM(document.heap().allocate<Attr>(document.realm(), document, move(qualified_name), move(value), owner_element));
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}
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JS::NonnullGCPtr<Attr> Attr::clone(Document& document)
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{
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return *heap().allocate<Attr>(realm(), document, m_qualified_name, m_value, nullptr).release_allocated_value_but_fixme_should_propagate_errors();
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}
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Attr::Attr(Document& document, QualifiedName qualified_name, DeprecatedString value, Element* owner_element)
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: Node(document, NodeType::ATTRIBUTE_NODE)
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, m_qualified_name(move(qualified_name))
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, m_value(move(value))
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, m_owner_element(owner_element)
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{
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}
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JS::ThrowCompletionOr<void> Attr::initialize(JS::Realm& realm)
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{
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MUST_OR_THROW_OOM(Base::initialize(realm));
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set_prototype(&Bindings::ensure_web_prototype<Bindings::AttrPrototype>(realm, "Attr"));
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return {};
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}
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void Attr::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_owner_element.ptr());
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}
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Element* Attr::owner_element()
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{
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return m_owner_element.ptr();
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}
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Element const* Attr::owner_element() const
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{
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return m_owner_element.ptr();
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}
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void Attr::set_owner_element(Element* owner_element)
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{
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m_owner_element = owner_element;
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}
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// https://dom.spec.whatwg.org/#set-an-existing-attribute-value
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void Attr::set_value(DeprecatedString value)
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{
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// 1. If attribute’s element is null, then set attribute’s value to value.
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if (!owner_element()) {
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m_value = move(value);
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return;
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}
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// 2. Otherwise, change attribute to value.
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// https://dom.spec.whatwg.org/#concept-element-attributes-change
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// 1. Handle attribute changes for attribute with attribute’s element, attribute’s value, and value.
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handle_attribute_changes(*owner_element(), m_value, value);
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// 2. Set attribute’s value to value.
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m_value = move(value);
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}
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// https://dom.spec.whatwg.org/#handle-attribute-changes
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void Attr::handle_attribute_changes(Element& element, DeprecatedString const& old_value, DeprecatedString const& new_value)
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{
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// 1. Queue a mutation record of "attributes" for element with attribute’s local name, attribute’s namespace, oldValue, « », « », null, and null.
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element.queue_mutation_record(MutationType::attributes, local_name(), namespace_uri(), old_value, {}, {}, nullptr, nullptr);
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// 2. If element is custom, then enqueue a custom element callback reaction with element, callback name "attributeChangedCallback", and an argument list containing attribute’s local name, oldValue, newValue, and attribute’s namespace.
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if (element.is_custom()) {
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auto& vm = this->vm();
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JS::MarkedVector<JS::Value> arguments { vm.heap() };
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arguments.append(JS::PrimitiveString::create(vm, local_name()));
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arguments.append(old_value.is_null() ? JS::js_null() : JS::PrimitiveString::create(vm, old_value));
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arguments.append(new_value.is_null() ? JS::js_null() : JS::PrimitiveString::create(vm, new_value));
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arguments.append(namespace_uri().is_null() ? JS::js_null() : JS::PrimitiveString::create(vm, namespace_uri()));
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element.enqueue_a_custom_element_callback_reaction(HTML::CustomElementReactionNames::attributeChangedCallback, move(arguments));
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}
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// FIXME: 3. Run the attribute change steps with element, attribute’s local name, oldValue, newValue, and attribute’s namespace.
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}
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}
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