func AllNumberGroupsAreExactlyPresent()

in matcher.go [175:211]
25 lines of code
8 McCabe index (conditional complexity)

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

	var candidateGroups = NON_DIGITS_PATTERN.FindAllString(normalizedCandidate, -1)
	// Set this to the last group, skipping it if the number has an extension.
	var candidateNumberGroupIndex = len(candidateGroups) - 2
	if number.GetExtension() != "" {
		candidateNumberGroupIndex = len(candidateGroups) - 1
	}

	// First we check if the national significant number is formatted
	// as a block. We use contains and not equals, since the national
	// significant number may be present with a prefix such as a national
	// number prefix, or the country code itself.
	if len(candidateGroups) == 1 || strings.Contains(
		candidateGroups[candidateNumberGroupIndex],
		GetNationalSignificantNumber(number)) {
		return true
	}
	// Starting from the end, go through in reverse, excluding the first
	// group, and check the candidate and number groups are the same.
	for formattedNumberGroupIndex := len(formattedNumberGroups) - 1; formattedNumberGroupIndex > 0 && candidateNumberGroupIndex >= 0; formattedNumberGroupIndex-- {
		if candidateGroups[candidateNumberGroupIndex] !=
			formattedNumberGroups[formattedNumberGroupIndex] {
			return false
		}
		candidateNumberGroupIndex--
	}
	// Now check the first group. There may be a national prefix at
	// the start, so we only check that the candidate group ends with
	// the formatted number group.
	return (candidateNumberGroupIndex >= 0 &&
		strings.HasSuffix(candidateGroups[candidateNumberGroupIndex],
			formattedNumberGroups[0]))
}