package validators import ( "fmt" "strconv" ) func Range(min int, max int) TextInputValidator { return TextInputRange{ min: min, max: max, } } type TextInputRange struct { min int max int } func (d TextInputRange) Notice() string { return fmt.Sprintf("Valid values: (%d - %d)", d.min, d.max) } func (d TextInputRange) ValidationFunc(input string) bool { portNum, err := strconv.Atoi(input) if err != nil { return false } if portNum > 65535 || portNum < 1 { return false } return true }