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/*
* Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/DOM/AbortSignal.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/EventDispatcher.h>
#include <LibWeb/HTML/EventHandler.h>
namespace Web::DOM {
JS::NonnullGCPtr<AbortSignal> AbortSignal::construct_impl(JS::Realm& realm)
{
return *realm.heap().allocate<AbortSignal>(realm, realm);
}
AbortSignal::AbortSignal(JS::Realm& realm)
: EventTarget(realm)
{
set_prototype(&Bindings::cached_web_prototype(realm, "AbortSignal"));
}
// https://dom.spec.whatwg.org/#abortsignal-add
void AbortSignal::add_abort_algorithm(JS::SafeFunction<void()> abort_algorithm)
{
// 1. If signal is aborted, then return.
if (aborted())
return;
// 2. Append algorithm to signal’s abort algorithms.
m_abort_algorithms.append(move(abort_algorithm));
}
// https://dom.spec.whatwg.org/#abortsignal-signal-abort
void AbortSignal::signal_abort(JS::Value reason)
{
// 1. If signal is aborted, then return.
if (aborted())
return;
// 2. Set signal’s abort reason to reason if it is given; otherwise to a new "AbortError" DOMException.
if (!reason.is_undefined())
m_abort_reason = reason;
else
m_abort_reason = WebIDL::AbortError::create(realm(), "Aborted without reason").ptr();
// 3. For each algorithm in signal’s abort algorithms: run algorithm.
for (auto& algorithm : m_abort_algorithms)
algorithm();
// 4. Empty signal’s abort algorithms.
m_abort_algorithms.clear();
// 5. Fire an event named abort at signal.
dispatch_event(*Event::create(realm(), HTML::EventNames::abort));
}
void AbortSignal::set_onabort(WebIDL::CallbackType* event_handler)
{
set_event_handler_attribute(HTML::EventNames::abort, event_handler);
}
WebIDL::CallbackType* AbortSignal::onabort()
{
return event_handler_attribute(HTML::EventNames::abort);
}
// https://dom.spec.whatwg.org/#dom-abortsignal-throwifaborted
JS::ThrowCompletionOr<void> AbortSignal::throw_if_aborted() const
{
// The throwIfAborted() method steps are to throw this’s abort reason, if this is aborted.
if (!aborted())
return {};
return JS::throw_completion(m_abort_reason);
}
void AbortSignal::visit_edges(JS::Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_abort_reason);
}
// https://dom.spec.whatwg.org/#abortsignal-follow
void AbortSignal::follow(JS::NonnullGCPtr<AbortSignal> parent_signal)
{
// A followingSignal (an AbortSignal) is made to follow a parentSignal (an AbortSignal) by running these steps:
// 1. If followingSignal is aborted, then return.
if (aborted())
return;
// 2. If parentSignal is aborted, then signal abort on followingSignal with parentSignal’s abort reason.
if (parent_signal->aborted()) {
signal_abort(parent_signal->reason());
return;
}
// 3. Otherwise, add the following abort steps to parentSignal:
// NOTE: `this` and `parent_signal` are protected by AbortSignal using JS::SafeFunction.
parent_signal->add_abort_algorithm([this, parent_signal] {
// 1. Signal abort on followingSignal with parentSignal’s abort reason.
signal_abort(parent_signal->reason());
});
}
}
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