original_string: public function parseToken()
      {
          foreach ($this->chain as $parser) {
              if ($response = $parser->parse($this->request)) {
                  return $response;
              }
          }
      }
code: public function parseToken()
      {
          foreach ($this->chain as $parser) {
              if ($response = $parser->parse($this->request)) {
                  return $response;
              }
          }
      }
code_tokens: public function parseToken ( ) { foreach ( $ this -> chain as $ parser ) { if ( $ response = $ parser -> parse ( $ this -> request ) ) { return $ response ; } } }
docstring: Iterate through the parsers and attempt to retrieve
  a value, otherwise return null.
  
  @return string|null
docstring_tokens: Iterate through the parsers and attempt to retrieve a value otherwise return null .