code: func ParsePort(s string) (p Port, err error) {
  	if strings.Contains(s, ":") {
  		return portFromHostContainer(s)
  	}
  
  	var port int
  	port, err = toPort(s)
  	if err != nil {
  		return
  	}
  	p.Host = port
  	p.Container = port
  	return
  }
docs: // ParsePort parses a string into a Port.