Function Parse

uuid.go:68–117

Parse decodes s into a UUID or returns an error if it cannot be parsed. Both the standard UUID forms defined in RFC 4122 (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx and urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) are decoded. In addition, Parse accepts non-standard strings such as the raw hex encodin

(s string)

// examined in the latter case.  Parse should not be used to validate strings as
// it parses non-standard encodings as indicated above.
func Parse(s string) (UUID, error) {
	var uuid UUID
	switch len(s) {
	// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	case 36:

	// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	case 36 + 9:
		if !strings.EqualFold(s[:9], "urn:uuid:") {
			return uuid, fmt.Errorf("invalid urn prefix: %q", s[:9])
		}
		s = s[9:]

	// {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
	case 36 + 2:
		s = s[1:]

	// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
	case 32:
		var ok bool
		for i := range uuid {
			uuid[i], ok = xtob(s[i*2], s[i*2+1])
			if !ok {
				return uuid, errors.New("invalid UUID format")
			}
		}
		return uuid, nil
	default:
		return uuid, invalidLengthError{len(s)}
	}
	// s is now at least 36 bytes long
	// it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
		return uuid, errors.New("invalid UUID format")
	}
	for i, x := range [16]int{
		0, 2, 4, 6,
		9, 11,
		14, 16,
		19, 21,
		24, 26, 28, 30, 32, 34,
	} {
		v, ok := xtob(s[x], s[x+1])
		if !ok {
			return uuid, errors.New("invalid UUID format")
		}
		uuid[i] = v
	}
	return uuid, nil
}

// ParseBytes is like Parse, except it parses a byte slice instead of a string.
func ParseBytes(b []byte) (UUID, error) {