private function buildIndent($base, $indent, $depth)
    {
        $base = \is_int($base) ? str_repeat(' ', $base) : (string) $base;

        return $depth === 0 ? $base : $base . str_repeat(
            \is_int($indent) ? str_repeat(' ', $indent) : (string) $indent,
            $depth
        );
    }