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LibWeb: Add the WritableStream interface

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Matthew Olsson 2023-04-02 15:15:53 -07:00 • committed by Linus Groh
parent 78feba401d
commit e93560b769
10 changed files with 311 additions and 0 deletions
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86
Userland/Libraries/LibWeb/Streams/WritableStream.cpp Normal file
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/*
* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/PromiseCapability.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/WritableStreamPrototype.h>
#include <LibWeb/Streams/AbstractOperations.h>
#include <LibWeb/Streams/UnderlyingSink.h>
#include <LibWeb/Streams/WritableStream.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::Streams {
// https://streams.spec.whatwg.org/#ws-constructor
WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStream>> WritableStream::construct_impl(JS::Realm& realm, Optional<JS::Handle<JS::Object>> const& underlying_sink_object)
{
auto& vm = realm.vm();
auto writable_stream = MUST_OR_THROW_OOM(realm.heap().allocate<WritableStream>(realm, realm));
// 1. If underlyingSink is missing, set it to null.
auto underlying_sink = underlying_sink_object.has_value() ? JS::Value(underlying_sink_object.value().ptr()) : JS::js_null();
// 2. Let underlyingSinkDict be underlyingSink, converted to an IDL value of type UnderlyingSink.
auto underlying_sink_dict = TRY(UnderlyingSink::from_value(vm, underlying_sink));
// 3. If underlyingSinkDict["type"] exists, throw a RangeError exception.
if (!underlying_sink_dict.type.has_value())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Invalid use of reserved key 'type'"sv };
// 4. Perform ! InitializeWritableStream(this).
// Note: This AO configures slot values which are already specified in the class's field initializers.
// FIXME: 5. Let sizeAlgorithm be ! ExtractSizeAlgorithm(strategy).
SizeAlgorithm size_algorithm = [](auto const&) { return JS::normal_completion(JS::Value(1)); };
// FIXME: 6. Let highWaterMark be ? ExtractHighWaterMark(strategy, 1).
auto high_water_mark = 1.0;
// FIXME: 7. Perform ? SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, underlyingSinkDict, highWaterMark, sizeAlgorithm).
(void)high_water_mark;
return writable_stream;
}
// https://streams.spec.whatwg.org/#ws-locked
bool WritableStream::locked() const
{
// 1. Return ! IsWritableStreamLocked(this).
return is_writable_stream_locked(*this);
}
WritableStream::WritableStream(JS::Realm& realm)
: Bindings::PlatformObject(realm)
{
}
JS::ThrowCompletionOr<void> WritableStream::initialize(JS::Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));
set_prototype(&Bindings::ensure_web_prototype<Bindings::WritableStreamPrototype>(realm, "WritableStream"));
return {};
}
void WritableStream::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_close_request);
visitor.visit(m_controller);
visitor.visit(m_in_flight_write_request);
visitor.visit(m_in_flight_close_request);
if (m_pending_abort_request.has_value()) {
visitor.visit(m_pending_abort_request->promise);
visitor.visit(m_pending_abort_request->reason);
}
visitor.visit(m_stored_error);
visitor.visit(m_writer);
for (auto& write_request : m_write_requests)
visitor.visit(write_request);
}
}