func BuildCountryCodeToRegionMap()

in builder.go [59:83]

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

func BuildCountryCodeToRegionMap(metadataCollection *PhoneMetadataCollection) map[int][]string {
	countryCodeToRegionCodeMap := make(map[int][]string)
	for _, metadata := range metadataCollection.Metadata {
		regionCode := metadata.GetId()
		countryCode := int(metadata.GetCountryCode())
		_, present := countryCodeToRegionCodeMap[countryCode]
		if present {
			phoneList := countryCodeToRegionCodeMap[countryCode]
			if metadata.GetMainCountryForCode() {
				phoneList = append([]string{regionCode}, phoneList...)
			} else {
				phoneList = append(phoneList, regionCode)
			}
			countryCodeToRegionCodeMap[countryCode] = phoneList
		} else {
			// For most countries, there will be only one region code for the country calling code.
			phoneList := []string{}
			if regionCode != "" { // For alternate formats, there are no region codes at all.
				phoneList = append(phoneList, regionCode)
			}
			countryCodeToRegionCodeMap[countryCode] = phoneList
		}
	}
	return countryCodeToRegionCodeMap
}