original_string: public function getParentDsId($dsId)
      {
          if (!array_key_exists($dsId, $this->parentMap)) {
              throw new InvalidArgumentException('Unknown ds_id ', $dsId);
          }
  
          return $this->parentMap[$dsId];
      }
code: public function getParentDsId($dsId)
      {
          if (!array_key_exists($dsId, $this->parentMap)) {
              throw new InvalidArgumentException('Unknown ds_id ', $dsId);
          }
  
          return $this->parentMap[$dsId];
      }
code_tokens: public function getParentDsId ( $ dsId ) { if ( ! array_key_exists ( $ dsId , $ this -> parentMap ) ) { throw new InvalidArgumentException ( 'Unknown ds_id ' , $ dsId ) ; } return $ this -> parentMap [ $ dsId ] ; }
docstring: Get parent node by node id.
  
  @param string $dsId
  
  @return string
  
  @throws InvalidArgumentException
docstring_tokens: Get parent node by node id .