private function getParameterDocDescription(string $name): ?string
  {
    if (isset($this->docBlockPartsSource['parameters']))
    {
      foreach ($this->docBlockPartsSource['parameters'] as $parameter_doc_info)
      {
        if ($parameter_doc_info['name']===$name) return $parameter_doc_info['description'];
      }
    }

    return null;
  }