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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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32
Userland/Libraries/LibWeb/Bindings/MainThreadVM.h
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
* Copyright (c) 2021-2023, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -10,11 +10,31 @@
#include <LibJS/Forward.h>
#include <LibJS/Runtime/JobCallback.h>
#include <LibJS/Runtime/VM.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/MutationObserver.h>
#include <LibWeb/HTML/EventLoop/EventLoop.h>
namespace Web::Bindings {
// https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-reactions-stack
struct CustomElementReactionsStack {
CustomElementReactionsStack() = default;
~CustomElementReactionsStack() = default;
// https://html.spec.whatwg.org/multipage/custom-elements.html#element-queue
// Each item in the stack is an element queue, which is initially empty as well. Each item in an element queue is an element.
// (The elements are not necessarily custom yet, since this queue is used for upgrades as well.)
Vector<Vector<JS::Handle<DOM::Element>>> element_queue_stack;
// https://html.spec.whatwg.org/multipage/custom-elements.html#backup-element-queue
// Each custom element reactions stack has an associated backup element queue, which an initially-empty element queue.
Vector<JS::Handle<DOM::Element>> backup_element_queue;
// https://html.spec.whatwg.org/multipage/custom-elements.html#processing-the-backup-element-queue
// To prevent reentrancy when processing the backup element queue, each custom element reactions stack also has a processing the backup element queue flag, initially unset.
bool processing_the_backup_element_queue { false };
};
struct WebEngineCustomData final : public JS::VM::CustomData {
virtual ~WebEngineCustomData() override = default;
@ -34,6 +54,15 @@ struct WebEngineCustomData final : public JS::VM::CustomData {
JS::Handle<JS::Realm> internal_realm;
OwnPtr<JS::ExecutionContext> root_execution_context;
// https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-reactions-stack
// Each similar-origin window agent has a custom element reactions stack, which is initially empty.
CustomElementReactionsStack custom_element_reactions_stack {};
// https://html.spec.whatwg.org/multipage/custom-elements.html#current-element-queue
// A similar-origin window agent's current element queue is the element queue at the top of its custom element reactions stack.
Vector<JS::Handle<DOM::Element>>& current_element_queue() { return custom_element_reactions_stack.element_queue_stack.last(); }
Vector<JS::Handle<DOM::Element>> const& current_element_queue() const { return custom_element_reactions_stack.element_queue_stack.last(); }
};
struct WebEngineCustomJobCallbackData final : public JS::JobCallback::CustomData {
@ -56,5 +85,6 @@ JS::VM& main_thread_vm();
void queue_mutation_observer_microtask(DOM::Document const&);
NonnullOwnPtr<JS::ExecutionContext> create_a_new_javascript_realm(JS::VM&, Function<JS::Object*(JS::Realm&)> create_global_object, Function<JS::Object*(JS::Realm&)> create_global_this_value);
void invoke_custom_element_reactions(Vector<JS::Handle<DOM::Element>>& element_queue);
}