Custom var template parser v2

<?php

class TemplateService
{
    public static function parse($str)
    {
        $lines = explode("\n", $str);
        $out = [];

        foreach($lines as $line)
        {
            if(!$line)
            {
                $out[]= '';
                continue;
            }
            else if($line[0] == '@')
            {
                $out[]= '<?php '.substr($line, 1).' ?>';
            }
        }
    }

    public static function parseExpr($str)
    {
        return preg_replace_callback(
            '/(?<VAR>\$\w+)(?:(?<DIR>[><])(?<PAD>\d+)(?::(?<CHAR>\w*))?(?:\.(?<DEC>\d+))?|#(?<DATE>\S+))?/',
            function($m) {
                $var = $m['VAR'];
                if(isset($m['DATE']))
                    $var =
                        "date(".
                            "'".str_replace('_', ' ', $m['DATE'])."', ".
                            "strtotime($var)".
                        ")";
                elseif(isset($m['DEC']))
                    $var =
                        "number_format(".
                            "$var,".
                            "{$m['DEC']},".
                            "',',".
                            "'.'".
                        ")";

                if(isset($m['DIR']))
                    $var =
                        "substr(".
                            "str_pad(".
                                "$var, ".
                                "{$m['PAD']},".
                                "'".($m['CHAR'] ?? ' ')."',".
                                ($m['DIR'] == '<' ? 'STR_PAD_LEFT' : 'STR_PAD_RIGHT').
                            ")".
                        ")";

                return "<?= $var ?>";
            },
            $str,
            -1,
            $c,
            PREG_UNMATCHED_AS_NULL
        );
    }
}