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LibWeb: Add AO create_readable_stream()

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Kenneth Myhra 2023-07-08 08:20:02 +02:00 • committed by Andreas Kling
parent 8e6b386ff7
commit a52f9970bc
2 changed files with 31 additions and 0 deletions
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30
Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
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@ -1156,6 +1156,36 @@ bool readable_byte_stream_controller_should_call_pull(ReadableByteStreamControll
return false;
}
// https://streams.spec.whatwg.org/#create-readable-stream
WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStream>> create_readable_stream(JS::Realm& realm, StartAlgorithm&& start_algorithm, PullAlgorithm&& pull_algorithm, CancelAlgorithm&& cancel_algorithm, Optional<double> high_water_mark, Optional<SizeAlgorithm>&& size_algorithm)
{
// 1. If highWaterMark was not passed, set it to 1.
if (!high_water_mark.has_value())
high_water_mark = 1.0;
// 2. If sizeAlgorithm was not passed, set it to an algorithm that returns 1.
if (!size_algorithm.has_value())
size_algorithm = [](auto const&) { return JS::normal_completion(JS::Value(1)); };
// 3. Assert: ! IsNonNegativeNumber(highWaterMark) is true.
VERIFY(is_non_negative_number(JS::Value { *high_water_mark }));
// 4. Let stream be a new ReadableStream.
auto stream = MUST_OR_THROW_OOM(realm.heap().allocate<ReadableStream>(realm, realm));
// 5. Perform ! InitializeReadableStream(stream).
initialize_readable_stream(*stream);
// 6. Let controller be a new ReadableStreamDefaultController.
auto controller = MUST_OR_THROW_OOM(realm.heap().allocate<ReadableStreamDefaultController>(realm, realm));
// 7. Perform ? SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm).
TRY(set_up_readable_stream_default_controller(*stream, *controller, move(start_algorithm), move(pull_algorithm), move(cancel_algorithm), *high_water_mark, move(*size_algorithm)));
// 8. Return stream.
return stream;
}
// https://streams.spec.whatwg.org/#create-writable-stream
WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStream>> create_writable_stream(JS::Realm& realm, StartAlgorithm&& start_algorithm, WriteAlgorithm&& write_algorithm, CloseAlgorithm&& close_algorithm, AbortAlgorithm&& abort_algorithm, double high_water_mark, SizeAlgorithm&& size_algorithm)
{