backend v4 half

SerpentRace_Backend/node_modules/libphonenumber-js/source/helpers/getPossibleCountriesForNumber.js

@@ -0,0 +1,28 @@
+import Metadata from '../metadata.js'
+
+/**
+ * Returns a list of countries that the phone number could potentially belong to.
+ * @param  {string} callingCode — Calling code.
+ * @param  {string} nationalNumber — National (significant) number.
+ * @param  {object} metadata — Metadata.
+ * @return {string[]} A list of possible countries.
+ */
+export default function getPossibleCountriesForNumber(callingCode, nationalNumber, metadata) {
+	const _metadata = new Metadata(metadata)
+	let possibleCountries = _metadata.getCountryCodesForCallingCode(callingCode)
+	if (!possibleCountries) {
+		return []
+	}
+	return possibleCountries.filter((country) => {
+		return couldNationalNumberBelongToCountry(nationalNumber, country, metadata)
+	})
+}
+
+function couldNationalNumberBelongToCountry(nationalNumber, country, metadata) {
+	const _metadata = new Metadata(metadata)
+	_metadata.selectNumberingPlan(country)
+	if (_metadata.numberingPlan.possibleLengths().indexOf(nationalNumber.length) >= 0) {
+		return true
+	}
+	return false
+}