func parsePrerelease()

in semver/semver.go [244:270]

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

func parsePrerelease(v string) (t, rest string, ok bool) {
	// "A pre-release version MAY be denoted by appending a hyphen and
	// a series of dot separated identifiers immediately following the patch version.
	// Identifiers MUST comprise only ASCII alphanumerics and hyphen [0-9A-Za-z-].
	// Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes."
	if v == "" || v[0] != '-' {
		return
	}
	i := 1
	start := 1
	for i < len(v) && v[i] != '+' {
		if !isIdentChar(v[i]) && v[i] != '.' {
			return
		}
		if v[i] == '.' {
			if start == i || isBadNum(v[start:i]) {
				return
			}
			start = i + 1
		}
		i++
	}
	if start == i || isBadNum(v[start:i]) {
		return
	}
	return v[:i], v[i:], true
}