func ParseRangeNumbers()

in pkg/util/util/util.go [63:107]
40 lines of code
9 McCabe index (conditional complexity)

func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
	rangeStr = strings.TrimSpace(rangeStr)
	numbers = make([]int64, 0)
	// e.g. 1000-2000,2001,2002,3000-4000
	numRanges := strings.Split(rangeStr, ",")
	for _, numRangeStr := range numRanges {
		// 1000-2000 or 2001
		numArray := strings.Split(numRangeStr, "-")
		// length: only 1 or 2 is correct
		rangeType := len(numArray)
		switch rangeType {
		case 1:
			// single number
			singleNum, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
			if errRet != nil {
				err = fmt.Errorf("range number is invalid, %v", errRet)
				return
			}
			numbers = append(numbers, singleNum)
		case 2:
			// range numbers
			min, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
			if errRet != nil {
				err = fmt.Errorf("range number is invalid, %v", errRet)
				return
			}
			max, errRet := strconv.ParseInt(strings.TrimSpace(numArray[1]), 10, 64)
			if errRet != nil {
				err = fmt.Errorf("range number is invalid, %v", errRet)
				return
			}
			if max < min {
				err = fmt.Errorf("range number is invalid")
				return
			}
			for i := min; i <= max; i++ {
				numbers = append(numbers, i)
			}
		default:
			err = fmt.Errorf("range number is invalid")
			return
		}
	}
	return
}