46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
/*
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* Copyright (c) 2023, Matthew Olsson <mattco@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 <LibJS/Runtime/Promise.h>
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#include <LibJS/Runtime/PromiseCapability.h>
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#include <LibWeb/Streams/AbstractOperations.h>
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#include <LibWeb/Streams/ReadableStream.h>
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#include <LibWeb/Streams/ReadableStreamGenericReader.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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#include <LibWeb/WebIDL/Promise.h>
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namespace Web::Streams {
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// https://streams.spec.whatwg.org/#generic-reader-closed
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WebIDL::ExceptionOr<JS::GCPtr<JS::Promise>> ReadableStreamGenericReaderMixin::closed()
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{
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// 1. Return this.[[closedPromise]].
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return JS::GCPtr { verify_cast<JS::Promise>(*m_closed_promise->promise()) };
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}
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// https://streams.spec.whatwg.org/#generic-reader-cancel
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WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> ReadableStreamGenericReaderMixin::cancel(JS::Value reason)
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{
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// 1. If this.[[stream]] is undefined, return a promise rejected with a TypeError exception.
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if (!m_stream) {
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auto& realm = stream()->realm();
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auto exception = MUST_OR_THROW_OOM(JS::TypeError::create(realm, "No stream present to cancel"sv));
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auto promise_capability = WebIDL::create_rejected_promise(realm, exception);
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return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise().ptr()) };
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}
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// 2. Return ! ReadableStreamReaderGenericCancel(this, reason).
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auto promise_capability = TRY(readable_stream_reader_generic_cancel(*this, reason));
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return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise().ptr()) };
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}
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void ReadableStreamGenericReaderMixin::visit_edges(JS::Cell::Visitor& visitor)
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{
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visitor.visit(m_closed_promise);
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visitor.visit(m_stream);
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}
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}
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