original_string: public function get_css_tree_post_processor() {
          $configs = [$this] + $this->parent_configs;
          foreach ($configs as $config) {
              if (!empty($config->csstreepostprocessor) && is_callable($config->csstreepostprocessor)) {
                  return $config->csstreepostprocessor;
              }
          }
          return null;
      }
code: public function get_css_tree_post_processor() {
          $configs = [$this] + $this->parent_configs;
          foreach ($configs as $config) {
              if (!empty($config->csstreepostprocessor) && is_callable($config->csstreepostprocessor)) {
                  return $config->csstreepostprocessor;
              }
          }
          return null;
      }
code_tokens: public function get_css_tree_post_processor ( ) { $ configs = [ $ this ] + $ this -> parent_configs ; foreach ( $ configs as $ config ) { if ( ! empty ( $ config -> csstreepostprocessor ) && is_callable ( $ config -> csstreepostprocessor ) ) { return $ config -> csstreepostprocessor ; } } return null ; }
docstring: Get the callable for CSS tree post processing.
  
  @return string|null
docstring_tokens: Get the callable for CSS tree post processing .