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