code: function tabbing(script) {
  	var prev, data;
  	script = script[0];
  	if ((prev = script.prev) && (data = prev.data)) {
  		return data.replace(/\n/g, '');
  	}
  	return '';
  }
docs: Preserve some indentation in output.
  @TODO: double check whitespace only.
  @param {$} script
  @returns {string}