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LibWeb: Implement AO ReadableByteStreamControllerRespond

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Shannon Booth 2023-12-02 21:26:38 +13:00 • committed by Andreas Kling
parent 2ab933e534
commit 08be5deb3f
2 changed files with 42 additions and 0 deletions
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41
Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
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@ -1226,6 +1226,47 @@ WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond_internal(Reada
return {};
}
// https://streams.spec.whatwg.org/#readable-byte-stream-controller-respond
WebIDL::ExceptionOr<void> readable_byte_stream_controller_respond(ReadableByteStreamController& controller, u64 bytes_written)
{
auto& realm = controller.realm();
// 1. Assert: controller.[[pendingPullIntos]] is not empty.
VERIFY(!controller.pending_pull_intos().is_empty());
// 2. Let firstDescriptor be controller.[[pendingPullIntos]][0].
auto& first_descriptor = controller.pending_pull_intos().first();
// 3. Let state be controller.[[stream]].[[state]].
auto state = controller.stream()->state();
// 4. If state is "closed",
if (state == ReadableStream::State::Closed) {
// 1. If bytesWritten is not 0, throw a TypeError exception.
if (bytes_written != 0)
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Bytes written is not zero for closed stream"sv };
}
// 5. Otherwise,
else {
// 1. Assert: state is "readable".
VERIFY(state == ReadableStream::State::Readable);
// 2. If bytesWritten is 0, throw a TypeError exception.
if (bytes_written == 0)
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Bytes written is zero for stream which is not closed"sv };
// 3. If firstDescriptor’s bytes filled + bytesWritten > firstDescriptor’s byte length, throw a RangeError exception.
if (first_descriptor.bytes_filled + bytes_written > first_descriptor.byte_length)
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Bytes written is greater than the pull requests byte length"sv };
}
// 6. Set firstDescriptor’s buffer to ! TransferArrayBuffer(firstDescriptor’s buffer).
first_descriptor.buffer = MUST(transfer_array_buffer(realm, *first_descriptor.buffer));
// 7. Perform ? ReadableByteStreamControllerRespondInternal(controller, bytesWritten).
return readable_byte_stream_controller_respond_internal(controller, bytes_written);
}
// https://streams.spec.whatwg.org/#readable-stream-default-controller-error
void readable_stream_default_controller_error(ReadableStreamDefaultController& controller, JS::Value error)
{