code: function(s_line, s_close_delim, z_merge_delim) {
  
  				// open block
  				add(
  					s_line || '',
  					z_merge_delim,
  					true
  				);
  
  				// set close delim
  				s_close = ('string' === typeof s_close_delim)? s_close_delim: a_closers.slice(-1)[0];
  				a_closers.push(s_close);
  
  				// increase indentation
  				add.tabs += 1;
  			}
docs: block open helper