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LibWeb: Implement the Streams SetUpReadableStreamBYOBReader AO

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Co-Authored-By: Matthew Olsson <mattco@serenityos.org>
This commit is contained in:
Shannon Booth 2023-06-29 20:52:35 +12:00 • committed by Linus Groh
parent aff38ae80f
commit 9ccadf61a2
2 changed files with 21 additions and 0 deletions
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20
Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
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@ -481,6 +481,26 @@ WebIDL::ExceptionOr<void> set_up_readable_stream_default_reader(ReadableStreamDe
return {};
}
// https://streams.spec.whatwg.org/#set-up-readable-stream-byob-reader
WebIDL::ExceptionOr<void> set_up_readable_stream_byob_reader(ReadableStreamBYOBReader& reader, ReadableStream& stream)
{
// 1. If ! IsReadableStreamLocked(stream) is true, throw a TypeError exception.
if (is_readable_stream_locked(stream))
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Cannot create stream reader for a locked stream"sv };
// 2. If stream.[[controller]] does not implement ReadableByteStreamController, throw a TypeError exception.
if (!stream.controller()->has<JS::NonnullGCPtr<ReadableByteStreamController>>())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "BYOB reader cannot set up reader from non-byte stream"sv };
// 3. Perform ! ReadableStreamReaderGenericInitialize(reader, stream).
readable_stream_reader_generic_initialize(ReadableStreamReader { reader }, stream);
// 4. Set reader.[[readIntoRequests]] to a new empty list.
reader.read_into_requests().clear();
return {};
}
// https://streams.spec.whatwg.org/#readable-stream-default-controller-close
void readable_stream_default_controller_close(ReadableStreamDefaultController& controller)
{