original_string: public function classNameForEvent($event): string
      {
          if ( ! isset($this->eventClasses[$event])) {
              throw new \InvalidArgumentException("Could not find a class for the event {$event}.");
          }
          return $this->eventClasses[$event];
      }
code: public function classNameForEvent($event): string
      {
          if ( ! isset($this->eventClasses[$event])) {
              throw new \InvalidArgumentException("Could not find a class for the event {$event}.");
          }
          return $this->eventClasses[$event];
      }
code_tokens: public function classNameForEvent ( $ event ) : string { if ( ! isset ( $ this -> eventClasses [ $ event ] ) ) { throw new \ InvalidArgumentException ( "Could not find a class for the event {$event}." ) ; } return $ this -> eventClasses [ $ event ] ; }
docstring: retrieve the fully qualified class name for an 'event name'
  
  @param $event
  @return string
docstring_tokens: retrieve the fully qualified class name for an event name