original_string: public function processNode(Parser $parser, $variable, $data, array $options)
      {
          $this->processAction($parser, $variable, $data, $options);
  
          return null;
      }
code: public function processNode(Parser $parser, $variable, $data, array $options)
      {
          $this->processAction($parser, $variable, $data, $options);
  
          return null;
      }
code_tokens: public function processNode ( Parser $ parser , $ variable , $ data , array $ options ) { $ this -> processAction ( $ parser , $ variable , $ data , $ options ) ; return null ; }
docstring: This can be overloaded to write a directive that just create one node for the
  document, which is common
  
  The arguments are the same that process
docstring_tokens: This can be overloaded to write a directive that just create one node for the document which is common