protected function copy_skip($chars)
{
$pos = $this->pos;
$len = strspn($this->doc, $chars, $pos);
$this->pos += $len;
$this->char = $this->pos < $this->size ? $this->doc[$this->pos] : null;
// next
if ($len === 0) {
return '';
}
return substr($this->doc, $pos, $len);
}