public function loadTemplateFromString($str)
    {
        $this->source = 'string: '.$str;
        $this->template = $this->tags = [];
        if (!$str) {
            return;
        }
        $this->tag_cnt = [];

        /* First expand self-closing tags {$tag} -> {tag}{/tag} */
        $str = preg_replace('/{\$([-_:\w]+)}/', '{\1}{/\1}', $str);

        $this->parseTemplate($str);

        return $this;
    }