PhpParser\NodeDumper::toColumn PHP Method

    private function toColumn($code, $pos)
    {
        if ($pos > strlen($code)) {
            throw new \RuntimeException('Invalid position information');
        }
        $lineStartPos = strrpos($code, "\n", $pos - strlen($code));
        if (false === $lineStartPos) {
            $lineStartPos = -1;
        }
        return $pos - $lineStartPos;
    }