original_string: protected function isSourceAttribute($key)
      {
          $modelName = source_model_name($this->getNodeTypeName(), true);
  
          return in_array($key, call_user_func([$modelName, 'getSourceFields']));
      }
code: protected function isSourceAttribute($key)
      {
          $modelName = source_model_name($this->getNodeTypeName(), true);
  
          return in_array($key, call_user_func([$modelName, 'getSourceFields']));
      }
code_tokens: protected function isSourceAttribute ( $ key ) { $ modelName = source_model_name ( $ this -> getNodeTypeName ( ) , true ) ; return in_array ( $ key , call_user_func ( [ $ modelName , 'getSourceFields' ] ) ) ; }
docstring: Checks if a key is a node source attribute
  
  @param $key
  @return bool
docstring_tokens: Checks if a key is a node source attribute