code: public function getParser()
      {
          @trigger_error(sprintf('The %s() method is deprecated since version 1.25 and will be removed in 2.0.', __FUNCTION__), E_USER_DEPRECATED);
  
          if (null === $this->parser) {
              $this->parser = new Twig_Parser($this);
          }
  
          return $this->parser;
      }
docs: Gets the Parser instance.
  
  @return Twig_ParserInterface
  
  @deprecated since 1.25 (to be removed in 2.0)