func AllNumberGroupsRemainGrouped()

in matcher.go [122:173]
29 lines of code
8 McCabe index (conditional complexity)

func AllNumberGroupsRemainGrouped(
	number *PhoneNumber,
	normalizedCandidate string,
	formattedNumberGroups []string) bool {

	var fromIndex = 0
	if number.GetCountryCodeSource() != PhoneNumber_FROM_DEFAULT_COUNTRY {
		// First skip the country code if the normalized candidate contained it.
		var cc = strconv.Itoa(int(number.GetCountryCode()))
		fromIndex = strings.Index(normalizedCandidate, cc) + len(cc)
	}
	// Check each group of consecutive digits are not broken into
	// separate groupings in the normalizedCandidate string.
	for i := 0; i < len(formattedNumberGroups); i++ {
		// Fails if the substring of normalizedCandidate starting
		// from fromIndex doesn't contain the consecutive digits
		// in formattedNumberGroups[i].
		fromIndex = strings.Index(
			normalizedCandidate[fromIndex+1:], formattedNumberGroups[i])
		if fromIndex < 0 {
			return false
		}
		// Moves fromIndex forward.
		fromIndex += len(formattedNumberGroups[i])
		if i == 0 && fromIndex < len(normalizedCandidate) {
			// We are at the position right after the NDC. We get
			// the region used for formatting information based on
			// the country code in the phone number, rather than the
			// number itself, as we do not need to distinguish between
			// different countries with the same country calling code
			// and this is faster.
			var region = GetRegionCodeForCountryCode(int(number.GetCountryCode()))
			if GetNddPrefixForRegion(region, true) != "" &&
				unicode.IsDigit(rune(normalizedCandidate[fromIndex])) {
				// This means there is no formatting symbol after the
				// NDC. In this case, we only accept the number if there
				// is no formatting symbol at all in the number, except
				// for extensions. This is only important for countries
				// with national prefixes.
				var nationalSignificantNumber = GetNationalSignificantNumber(number)
				return strings.HasPrefix(
					normalizedCandidate[fromIndex-len(formattedNumberGroups[i]):],
					nationalSignificantNumber)
			}
		}
	}

	// The check here makes sure that we haven't mistakenly already
	// used the extension to match the last group of the subscriber
	// number. Note the extension cannot have formatting in-between digits.
	return strings.Contains(normalizedCandidate[fromIndex:], number.GetExtension())
}