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LibWeb: Introduce CustomElementRegistry and creating custom elements

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The main missing feature here is form associated custom elements.
This commit is contained in:
Luke Wilde 2023-03-29 23:46:18 +01:00 • committed by Andreas Kling
parent 083b547e97
commit 034aaf3f51
38 changed files with 1747 additions and 143 deletions
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51
Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.h Normal file
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/*
* Copyright (c) 2023, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefCounted.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/HTML/CustomElements/CustomElementDefinition.h>
namespace Web::HTML {
struct ElementDefinitionOptions {
Optional<String> extends;
};
// https://html.spec.whatwg.org/multipage/custom-elements.html#customelementregistry
class CustomElementRegistry : public Bindings::PlatformObject {
WEB_PLATFORM_OBJECT(CustomElementRegistry, Bindings::PlatformObject);
public:
virtual ~CustomElementRegistry() override;
JS::ThrowCompletionOr<void> define(String const& name, WebIDL::CallbackType* constructor, ElementDefinitionOptions options);
Variant<JS::Handle<WebIDL::CallbackType>, JS::Value> get(String const& name) const;
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> when_defined(String const& name);
void upgrade(JS::NonnullGCPtr<DOM::Node> root) const;
JS::GCPtr<CustomElementDefinition> get_definition_with_name_and_local_name(String const& name, String const& local_name) const;
JS::GCPtr<CustomElementDefinition> get_definition_from_new_target(JS::FunctionObject const& new_target) const;
private:
CustomElementRegistry(JS::Realm&);
virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
// Every CustomElementRegistry has a set of custom element definitions, initially empty. In general, algorithms in this specification look up elements in the registry by any of name, local name, or constructor.
Vector<JS::Handle<CustomElementDefinition>> m_custom_element_definitions;
// https://html.spec.whatwg.org/multipage/custom-elements.html#element-definition-is-running
// Every CustomElementRegistry also has an element definition is running flag which is used to prevent reentrant invocations of element definition. It is initially unset.
bool m_element_definition_is_running { false };
// https://html.spec.whatwg.org/multipage/custom-elements.html#when-defined-promise-map
// Every CustomElementRegistry also has a when-defined promise map, mapping valid custom element names to promises. It is used to implement the whenDefined() method.
OrderedHashMap<String, JS::Handle<JS::Promise>> m_when_defined_promise_map;
};
}