code: public function processBlockTags(Tag $tag)
      {
          if ($tag->isInline()) {
              return;
          }
  
          $text = null;
          $tag->getText()->replace('/(^{([^:\(\)]+)}[ \t]*\n?|(?:[ \t]*|\n?){([^:\(\)]+)}\n*$)/', function (Text $w) use (&$text) {
              $text = $w->trim()->trim('{}');
  
              return '';
          });
  
          if ($text) {
              $tag->setAttributes($this->parseAttributes($text));
          }
      }
docs: Parse emmet style attributes
  
  @param Tag $tag