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import Metadata from '../metadata.js'
import getNumberType from './getNumberType.js'
export default function getCountryByNationalNumber(nationalPhoneNumber, {
countries,
defaultCountry,
metadata
}) {
// Re-create `metadata` because it will be selecting a `country`.
metadata = new Metadata(metadata)
const matchingCountries = []
for (const country of countries) {
metadata.country(country)
// "Leading digits" patterns are only defined for about 20% of all countries.
// By definition, matching "leading digits" is a sufficient but not a necessary
// condition for a phone number to belong to a country.
// The point of "leading digits" check is that it's the fastest one to get a match.
// https://gitlab.com/catamphetamine/libphonenumber-js/blob/master/METADATA.md#leading_digits
// I'd suppose that "leading digits" patterns are mutually exclusive for different countries
// because of the intended use of that feature.
if (metadata.leadingDigits()) {
if (nationalPhoneNumber &&
nationalPhoneNumber.search(metadata.leadingDigits()) === 0) {
return country
}
}
// Else perform full validation with all of those
// fixed-line/mobile/etc regular expressions.
else if (getNumberType({ phone: nationalPhoneNumber, country }, undefined, metadata.metadata)) {
// If the `defaultCountry` is among the `matchingCountries` then return it.
if (defaultCountry) {
if (country === defaultCountry) {
return country
}
matchingCountries.push(country)
} else {
return country
}
}
}
// Return the first ("main") one of the `matchingCountries`.
if (matchingCountries.length > 0) {
return matchingCountries[0]
}
}
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