original_string: public function getAttributes()
      {
          if (self::$attributes === null) {
              self::$attributes = $this->loadJson($this->resource('HtmlBooleanAttributes.json'))->attributes;
          }
  
          return self::$attributes;
      }
code: public function getAttributes()
      {
          if (self::$attributes === null) {
              self::$attributes = $this->loadJson($this->resource('HtmlBooleanAttributes.json'))->attributes;
          }
  
          return self::$attributes;
      }
code_tokens: public function getAttributes ( ) { if ( self :: $ attributes === null ) { self :: $ attributes = $ this -> loadJson ( $ this -> resource ( 'HtmlBooleanAttributes.json' ) ) -> attributes ; } return self :: $ attributes ; }
docstring: Get the html boolean attributes.
  
  @throws \ArjanSchouten\HtmlMinifier\Exception\FileNotFoundException
  
  @return \Illuminate\Support\Collection
docstring_tokens: Get the html boolean attributes .