toLines static method

StreamTransformer<Uint8List, String> toLines({ int delimiter = 13, })

Transforms a stream of Uint8List into a stream of lines separated by delimiter.

Useful for text-based protocols like ELM327 (OBD-II). Default delimiter is '\r' (0x0D).

Implementation

static StreamTransformer<Uint8List, String> toLines({int delimiter = 13}) {
  return StreamTransformer<Uint8List, String>.fromHandlers(
    handleData: (data, sink) {
      // Simple implementation: convert to string and split.
      // For production, a buffer-based approach handling split delimiters is better.
      // Here we assume ASCII for simplicity as per common ELM327 usage.

      // Note: This simple implementation might break if a delimiter is split across chunks.
      // But for standard OBD responses which are short, this often works.
      // A robust implementation would use a buffer.

      // Let's use a robust buffer approach.
      _buffer.addAll(data);

      int index;
      while ((index = _buffer.indexOf(delimiter)) != -1) {
        final lineBytes = _buffer.sublist(0, index);
        sink.add(String.fromCharCodes(lineBytes));
        _buffer.removeRange(0, index + 1);
      }
    },
  );
}