original_string: public function determine_format() {
          if (!$this->grade->grade_item->is_overridable_item()) {
              return new empty_element();
          }
          return new checkbox_attribute(
              $this->get_name(),
              $this->get_label(),
              $this->is_checked(),
              $this->is_disabled()
          );
      }
code: public function determine_format() {
          if (!$this->grade->grade_item->is_overridable_item()) {
              return new empty_element();
          }
          return new checkbox_attribute(
              $this->get_name(),
              $this->get_label(),
              $this->is_checked(),
              $this->is_disabled()
          );
      }
code_tokens: public function determine_format ( ) { if ( ! $ this -> grade -> grade_item -> is_overridable_item ( ) ) { return new empty_element ( ) ; } return new checkbox_attribute ( $ this -> get_name ( ) , $ this -> get_label ( ) , $ this -> is_checked ( ) , $ this -> is_disabled ( ) ) ; }
docstring: Generate the element for this form input.
  
  @return element
docstring_tokens: Generate the element for this form input .