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LibWeb: Return a representation of an 'Agent' in 'relevant agent'

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This makes it more convenient to use the 'relvant agent' concept,
instead of the awkward dynamic casts we needed to do for every call
site.

mutation_observers is also changed to hold a GC::Root instead of raw
GC::Ptr. Somehow this was not causing problems before, but trips up CI
after these changes.
This commit is contained in:
Shannon Booth 2025-01-04 23:12:55 +13:00 • committed by Tim Flynn
commit 64eeda6450
Notes: github-actions[bot] 2025-01-11 15:40:39 +00:00
15 changed files with 140 additions and 98 deletions
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43
Libraries/LibWeb/HTML/Scripting/Agent.h Normal file
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/*
* Copyright (c) 2025, Shannon Booth <shannon@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/OwnPtr.h>
#include <AK/Vector.h>
#include <LibGC/Root.h>
#include <LibJS/Forward.h>
#include <LibWeb/Forward.h>
#include <LibWeb/HTML/CustomElements/CustomElementReactionsStack.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/webappapis.html#similar-origin-window-agent
struct Agent {
GC::Root<HTML::EventLoop> event_loop;
// FIXME: These should only be on similar-origin window agents, but we don't currently differentiate agent types.
// https://dom.spec.whatwg.org/#mutation-observer-compound-microtask-queued-flag
bool mutation_observer_microtask_queued { false };
// https://dom.spec.whatwg.org/#mutation-observer-list
// FIXME: This should be a set.
Vector<GC::Root<DOM::MutationObserver>> mutation_observers;
// 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<GC::Root<DOM::Element>>& current_element_queue() { return custom_element_reactions_stack.element_queue_stack.last(); }
Vector<GC::Root<DOM::Element>> const& current_element_queue() const { return custom_element_reactions_stack.element_queue_stack.last(); }
};
Agent& relevant_agent(JS::Object const&);
}