Function parseGroupedOutput

pj_runtime/src/DataProcessorService.cpp:455–485

A grouped MIMO output is requested EXPLICITLY as a single structured `outputs` entry " : , ,..., ": the host then materializes ONE topic named with those N named columns (column k = the script's k-th result), instead of N separate scalar topics. Returns {topic, [fields]} when the single output entry has that shape (non-empty topic + >= 1 non-empty field); otherwi

// intent unambiguous (unlike inferring a shared prefix) and entirely host-side —
// the plugin opts in by naming, e.g. outputs = {"rpy:roll,pitch,yaw"}.
std::pair<std::string, std::vector<std::string>> parseGroupedOutput(const std::vector<std::string>& outputs) {
  if (outputs.size() != 1) {
    return {"", {}};
  }
  const std::string& spec = outputs.front();
  const auto colon = spec.find(':');
  if (colon == std::string::npos || colon == 0) {
    return {"", {}};
  }
  const std::string topic = spec.substr(0, colon);
  std::vector<std::string> fields;
  std::size_t start = colon + 1;
  while (start <= spec.size()) {
    const std::size_t comma = spec.find(',', start);
    const std::size_t end = (comma == std::string::npos) ? spec.size() : comma;
    std::string field = spec.substr(start, end - start);
    const auto b = field.find_first_not_of(" \t");
    const auto e = field.find_last_not_of(" \t");
    if (b != std::string::npos) {
      fields.push_back(field.substr(b, e - b + 1));
    }
    if (comma == std::string::npos) {
      break;
    }
    start = comma + 1;
  }
  if (fields.empty()) {
    return {"", {}};
  }
  return {topic, std::move(fields)};
}

}  // namespace