func prefixNumberWithCountryCallingCode()

in phonenumbers.go [1745:1775]

• 28 lines of code
• 5 McCabe index (conditional complexity)

func prefixNumberWithCountryCallingCode(
	countryCallingCode int,
	numberFormat PhoneNumberFormat,
	formattedNumber *Builder) {

	// TODO(ttacon): add some sort of BulkWrite builder to Builder
	// also that name isn't too awesome...:)
	newBuf := NewBuilder(nil)
	switch numberFormat {
	case E164:
		newBuf.WriteString(string(PLUS_SIGN))
		newBuf.Write(strconv.AppendInt([]byte{}, int64(countryCallingCode), 10))
		newBuf.Write(formattedNumber.Bytes())
	case INTERNATIONAL:
		newBuf.WriteString(string(PLUS_SIGN))
		newBuf.Write(strconv.AppendInt([]byte{}, int64(countryCallingCode), 10))
		newBuf.WriteString(" ")
		newBuf.Write(formattedNumber.Bytes())
	case RFC3966:
		newBuf.WriteString(RFC3966_PREFIX)
		newBuf.WriteString(string(PLUS_SIGN))
		newBuf.Write(strconv.AppendInt([]byte{}, int64(countryCallingCode), 10))
		newBuf.WriteString("-")
		newBuf.Write(formattedNumber.Bytes())
	case NATIONAL:
		fallthrough
	default:
		newBuf.Write(formattedNumber.Bytes())
	}
	formattedNumber.ResetWith(newBuf.Bytes())
}