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LibWeb: Add the ReadableStreamGenericReader mixin interface

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Matthew Olsson 2023-03-28 17:43:34 -07:00 • committed by Linus Groh
parent f409f68a9a
commit fe69d66a4e
9 changed files with 189 additions and 3 deletions
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45
Userland/Libraries/LibWeb/Streams/ReadableStreamGenericReader.cpp Normal file
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/*
* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/Promise.h>
#include <LibJS/Runtime/PromiseCapability.h>
#include <LibWeb/Streams/AbstractOperations.h>
#include <LibWeb/Streams/ReadableStream.h>
#include <LibWeb/Streams/ReadableStreamGenericReader.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
#include <LibWeb/WebIDL/Promise.h>
namespace Web::Streams {
// https://streams.spec.whatwg.org/#generic-reader-closed
WebIDL::ExceptionOr<JS::GCPtr<JS::Promise>> ReadableStreamGenericReaderMixin::closed()
{
// 1. Return this.[[closedPromise]].
return JS::GCPtr { verify_cast<JS::Promise>(*m_closed_promise->promise()) };
}
// https://streams.spec.whatwg.org/#generic-reader-cancel
WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> ReadableStreamGenericReaderMixin::cancel(JS::Value reason)
{
// 1. If this.[[stream]] is undefined, return a promise rejected with a TypeError exception.
if (!m_stream) {
auto& realm = stream()->realm();
auto promise_capability = WebIDL::create_rejected_promise(realm, TRY(JS::TypeError::create(realm, "No stream present to cancel"sv)));
return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise().ptr()) };
}
// 2. Return ! ReadableStreamReaderGenericCancel(this, reason).
auto promise_capability = readable_stream_reader_generic_cancel(*this, reason);
return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise().ptr()) };
}
void ReadableStreamGenericReaderMixin::visit_edges(JS::Cell::Visitor& visitor)
{
visitor.visit(m_closed_promise);
visitor.visit(m_stream);
}
}