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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/WeakPtr.h>
#include <LibCore/Forward.h>
#include <LibJS/Forward.h>
#include <LibJS/SafeFunction.h>
#include <LibWeb/HTML/EventLoop/TaskQueue.h>
namespace Web::HTML {
class EventLoop {
public:
enum class Type {
// https://html.spec.whatwg.org/multipage/webappapis.html#window-event-loop
Window,
// https://html.spec.whatwg.org/multipage/webappapis.html#worker-event-loop
Worker,
// https://html.spec.whatwg.org/multipage/webappapis.html#worklet-event-loop
Worklet,
};
EventLoop();
~EventLoop();
Type type() const { return m_type; }
TaskQueue& task_queue() { return m_task_queue; }
TaskQueue const& task_queue() const { return m_task_queue; }
TaskQueue& microtask_queue() { return m_microtask_queue; }
TaskQueue const& microtask_queue() const { return m_microtask_queue; }
void spin_until(Function<bool()> goal_condition);
void process();
// https://html.spec.whatwg.org/multipage/browsing-the-web.html#termination-nesting-level
size_t termination_nesting_level() const { return m_termination_nesting_level; }
void increment_termination_nesting_level() { ++m_termination_nesting_level; }
void decrement_termination_nesting_level() { --m_termination_nesting_level; }
Task const* currently_running_task() const { return m_currently_running_task; }
JS::VM& vm() { return *m_vm; }
JS::VM const& vm() const { return *m_vm; }
void set_vm(JS::VM&);
void schedule();
void perform_a_microtask_checkpoint();
void register_document(Badge<DOM::Document>, DOM::Document&);
void unregister_document(Badge<DOM::Document>, DOM::Document&);
Vector<JS::Handle<DOM::Document>> documents_in_this_event_loop() const;
Vector<JS::Handle<HTML::Window>> same_loop_windows() const;
void push_onto_backup_incumbent_settings_object_stack(Badge<EnvironmentSettingsObject>, EnvironmentSettingsObject& environment_settings_object);
void pop_backup_incumbent_settings_object_stack(Badge<EnvironmentSettingsObject>);
EnvironmentSettingsObject& top_of_backup_incumbent_settings_object_stack();
bool is_backup_incumbent_settings_object_stack_empty() const { return m_backup_incumbent_settings_object_stack.is_empty(); }
void register_environment_settings_object(Badge<EnvironmentSettingsObject>, EnvironmentSettingsObject&);
void unregister_environment_settings_object(Badge<EnvironmentSettingsObject>, EnvironmentSettingsObject&);
double compute_deadline() const;
// https://html.spec.whatwg.org/multipage/webappapis.html#pause
void set_execution_paused(bool execution_paused) { m_execution_paused = execution_paused; }
bool execution_paused() const { return m_execution_paused; }
private:
Type m_type { Type::Window };
TaskQueue m_task_queue;
TaskQueue m_microtask_queue;
// https://html.spec.whatwg.org/multipage/webappapis.html#currently-running-task
Task* m_currently_running_task { nullptr };
// https://html.spec.whatwg.org/multipage/webappapis.html#last-render-opportunity-time
double m_last_render_opportunity_time { 0 };
// https://html.spec.whatwg.org/multipage/webappapis.html#last-idle-period-start-time
double m_last_idle_period_start_time { 0 };
JS::VM* m_vm { nullptr };
RefPtr<Platform::Timer> m_system_event_loop_timer;
// https://html.spec.whatwg.org/#performing-a-microtask-checkpoint
bool m_performing_a_microtask_checkpoint { false };
Vector<WeakPtr<DOM::Document>> m_documents;
// Used to implement step 4 of "perform a microtask checkpoint".
Vector<EnvironmentSettingsObject&> m_related_environment_settings_objects;
// https://html.spec.whatwg.org/multipage/webappapis.html#backup-incumbent-settings-object-stack
Vector<EnvironmentSettingsObject&> m_backup_incumbent_settings_object_stack;
// https://html.spec.whatwg.org/multipage/browsing-the-web.html#termination-nesting-level
size_t m_termination_nesting_level { 0 };
bool m_execution_paused { false };
};
EventLoop& main_thread_event_loop();
void old_queue_global_task_with_document(HTML::Task::Source, DOM::Document&, JS::SafeFunction<void()> steps);
void queue_global_task(HTML::Task::Source, JS::Object&, JS::SafeFunction<void()> steps);
void queue_a_microtask(DOM::Document const*, JS::SafeFunction<void()> steps);
void perform_a_microtask_checkpoint();
}
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