func parseVerParts()

in cvefeed/nvd/smartvercmp.go [63:87]

• 21 lines of code
• 12 McCabe index (conditional complexity)

func parseVerParts(v string) (int, int, int) {
	var num int
	for num = 0; num < len(v); num++ {
		if v[num] < '0' || v[num] > '9' {
			break
		}
	}
	if num == len(v) {
		return num, num, num
	}
	// Any punctuation separates the parts.
	skip := strings.IndexFunc(v, func(b rune) bool {
		// !"#$%&'()*+,-./ are dec 33 to 47, :;<=>?@ are dec 58 to 64, [\]^_` are dec 91 to 96 and {|}~ are dec 123 to 126.
		// So, punctuation is in dec 33-126 range except 48-57, 65-90 and 97-122 gaps.
		// This inverse logic allows for early short-circuting for most of the chars and shaves ~20ns in benchmarks.
		return b >= '!' && b <= '~' &&
			!(b > '/' && b < ':' ||
				b > '@' && b < '[' ||
				b > '`' && b < '{')
	})
	if skip == -1 {
		return num, len(v), len(v)
	}
	return num, skip, skip + 1
}