Latte\Runtime\Filters::indent PHP Method

    public static function indent(FilterInfo $info, $s, $level = 1, $chars = "\t")
    {
        if ($level < 1) {
            // do nothing
        } elseif (in_array($info->contentType, [Engine::CONTENT_HTML, Engine::CONTENT_XHTML], TRUE)) {
            $s = preg_replace_callback('#<(textarea|pre).*?</\\1#si', function ($m) {
                return strtr($m[0], " \t\r\n", "");
            }, $s);
            if (preg_last_error()) {
                throw new Latte\RegexpException(NULL, preg_last_error());
            }
            $s = preg_replace('#(?:^|[\\r\\n]+)(?=[^\\r\\n])#', '$0' . str_repeat($chars, $level), $s);
            $s = strtr($s, "", " \t\r\n");
        } else {
            $s = preg_replace('#(?:^|[\\r\\n]+)(?=[^\\r\\n])#', '$0' . str_repeat($chars, $level), $s);
        }
        return $s;
    }