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