107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "AbortSignal.h"
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#include "AbortAlgorithm.h"
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#include "Event.h"
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#include "EventNames.h"
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#include "ScriptExecutionContext.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(AbortSignal);
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Ref<AbortSignal> AbortSignal::create(ScriptExecutionContext& context)
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{
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return adoptRef(*new AbortSignal(context));
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}
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// https://dom.spec.whatwg.org/#dom-abortsignal-abort
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Ref<AbortSignal> AbortSignal::abort(ScriptExecutionContext& context)
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{
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return adoptRef(*new AbortSignal(context, Aborted::Yes));
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}
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AbortSignal::AbortSignal(ScriptExecutionContext& context, Aborted aborted)
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: ContextDestructionObserver(&context)
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, m_aborted(aborted == Aborted::Yes)
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{
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}
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// https://dom.spec.whatwg.org/#abortsignal-signal-abort
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void AbortSignal::signalAbort()
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{
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// 1. If signal's aborted flag is set, then return.
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if (m_aborted)
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return;
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// 2. Set signal’s aborted flag.
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m_aborted = true;
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auto protectedThis = makeRef(*this);
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auto algorithms = std::exchange(m_algorithms, { });
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for (auto& algorithm : algorithms)
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algorithm();
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// 5. Fire an event named abort at signal.
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dispatchEvent(Event::create(eventNames().abortEvent, Event::CanBubble::No, Event::IsCancelable::No));
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}
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// https://dom.spec.whatwg.org/#abortsignal-follow
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void AbortSignal::signalFollow(AbortSignal& signal)
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{
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if (aborted())
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return;
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if (signal.aborted()) {
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signalAbort();
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return;
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}
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ASSERT(!m_followingSignal);
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m_followingSignal = makeWeakPtr(signal);
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signal.addAlgorithm([weakThis = makeWeakPtr(this)] {
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if (weakThis)
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weakThis->signalAbort();
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});
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}
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bool AbortSignal::whenSignalAborted(AbortSignal& signal, Ref<AbortAlgorithm>&& algorithm)
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{
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if (signal.aborted()) {
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algorithm->handleEvent();
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return true;
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}
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signal.addAlgorithm([algorithm = WTFMove(algorithm)]() mutable {
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algorithm->handleEvent();
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});
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return false;
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}
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}
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