func parsePossibleLengthStringToSet()

in builder.go [289:327]

• 33 lines of code
• 9 McCabe index (conditional complexity)

func parsePossibleLengthStringToSet(possibleLengthString string) map[int32]bool {
	if possibleLengthString == "" {
		panic("Empty possibleLength string found.")
	}
	lengths := strings.Split(possibleLengthString, ",")
	lengthSet := make(map[int32]bool)

	for i := 0; i < len(lengths); i++ {
		lengthSubstring := lengths[i]
		if lengthSubstring == "" {
			panic("Leading, trailing or adjacent commas in possible length string %s, these should only separate numbers or ranges.")
		} else if lengthSubstring[0] == '[' {
			if lengthSubstring[len(lengthSubstring)-1] != ']' {
				panic(fmt.Sprintf("Missing end of range character in possible length string %s.", possibleLengthString))
			}
			// Strip the leading and trailing [], and split on the -.
			minMax := strings.Split(lengthSubstring[1:len(lengthSubstring)-1], "-")
			if len(minMax) != 2 {
				panic(fmt.Sprintf("Ranges must have exactly one - character: missing for %s.", possibleLengthString))
			}
			min, _ := strconv.Atoi(minMax[0])
			max, _ := strconv.Atoi(minMax[1])

			// We don't even accept [6-7] since we prefer the shorter 6,7 variant; for a range to be in
			// use the hyphen needs to replace at least one digit.
			if max-min < 2 {
				panic(fmt.Sprintf("The first number in a range should be two or more digits lower than the second. Culprit possibleLength string: %s", possibleLengthString))
			}

			for j := min; j <= max; j++ {
				lengthSet[int32(j)] = true
			}
		} else {
			length, _ := strconv.Atoi(lengthSubstring)
			lengthSet[int32(length)] = true
		}
	}
	return lengthSet
}