func FormatInOriginalFormat()

in phonenumbers.go [1475:1571]
68 lines of code
16 McCabe index (conditional complexity)

func FormatInOriginalFormat(number *PhoneNumber, regionCallingFrom string) string {
	rawInput := number.GetRawInput()
	if len(rawInput) == 0 && !hasFormattingPatternForNumber(number) {
		// We check if we have the formatting pattern because without that, we might format the number
		// as a group without national prefix.
		return rawInput
	}
	if number.GetCountryCodeSource() == 0 {
		return Format(number, NATIONAL)
	}
	var formattedNumber string
	switch number.GetCountryCodeSource() {
	case PhoneNumber_FROM_NUMBER_WITH_PLUS_SIGN:
		formattedNumber = Format(number, INTERNATIONAL)
	case PhoneNumber_FROM_NUMBER_WITH_IDD:
		formattedNumber = FormatOutOfCountryCallingNumber(number, regionCallingFrom)
	case PhoneNumber_FROM_NUMBER_WITHOUT_PLUS_SIGN:
		formattedNumber = Format(number, INTERNATIONAL)[1:]
	case PhoneNumber_FROM_DEFAULT_COUNTRY:
		// Fall-through to default case.
		fallthrough
	default:
		regionCode := GetRegionCodeForCountryCode(int(number.GetCountryCode()))
		// We strip non-digits from the NDD here, and from the raw
		// input later, so that we can compare them easily.
		nationalPrefix := GetNddPrefixForRegion(
			regionCode, true /* strip non-digits */)
		nationalFormat := Format(number, NATIONAL)
		if len(nationalPrefix) == 0 {
			// If the region doesn't have a national prefix at all,
			// we can safely return the national format without worrying
			// about a national prefix being added.
			formattedNumber = nationalFormat
			break
		}
		// Otherwise, we check if the original number was entered with
		// a national prefix.
		if rawInputContainsNationalPrefix(rawInput, nationalPrefix, regionCode) {
			// If so, we can safely return the national format.
			formattedNumber = nationalFormat
			break
		}
		// Metadata cannot be null here because GetNddPrefixForRegion()
		// (above) returns null if there is no metadata for the region.
		metadata := getMetadataForRegion(regionCode)
		nationalNumber := GetNationalSignificantNumber(number)
		formatRule :=
			chooseFormattingPatternForNumber(metadata.GetNumberFormat(), nationalNumber)
		// The format rule could still be null here if the national
		// number was 0 and there was no raw input (this should not
		// be possible for numbers generated by the phonenumber library
		// as they would also not have a country calling code and we
		// would have exited earlier).
		if formatRule == nil {
			formattedNumber = nationalFormat
			break
		}
		// When the format we apply to this number doesn't contain
		// national prefix, we can just return the national format.
		// TODO: Refactor the code below with the code in
		// isNationalPrefixPresentIfRequired.
		candidateNationalPrefixRule := formatRule.GetNationalPrefixFormattingRule()
		// We assume that the first-group symbol will never be _before_
		// the national prefix.
		indexOfFirstGroup := strings.Index(candidateNationalPrefixRule, "$1")
		if indexOfFirstGroup <= 0 {
			formattedNumber = nationalFormat
			break
		}
		candidateNationalPrefixRule =
			candidateNationalPrefixRule[0:indexOfFirstGroup]
		candidateNationalPrefixRule = NormalizeDigitsOnly(candidateNationalPrefixRule)
		if len(candidateNationalPrefixRule) == 0 {
			// National prefix not used when formatting this number.
			formattedNumber = nationalFormat
			break
		}
		// Otherwise, we need to remove the national prefix from our output.
		numFormatCopy := &NumberFormat{}
		proto.Merge(numFormatCopy, formatRule)
		numFormatCopy.NationalPrefixFormattingRule = nil
		var numberFormats = []*NumberFormat{numFormatCopy}
		formattedNumber = FormatByPattern(number, NATIONAL, numberFormats)
	}
	rawInput = number.GetRawInput()
	// If no digit is inserted/removed/modified as a result of our
	// formatting, we return the formatted phone number; otherwise we
	// return the raw input the user entered.
	if len(formattedNumber) != 0 && len(rawInput) > 0 {
		normalizedFormattedNumber := normalizeDiallableCharsOnly(formattedNumber)
		normalizedRawInput := normalizeDiallableCharsOnly(rawInput)
		if normalizedFormattedNumber != normalizedRawInput {
			formattedNumber = rawInput
		}
	}
	return formattedNumber
}