libphonenumber-js/es6/helpers/getPossibleCountriesForNumber.js

A simpler (and smaller) rewrite of Google Android's libphonenumber library in javascript

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) {
  var _metadata = new Metadata(metadata);

  var possibleCountries = _metadata.getCountryCodesForCallingCode(callingCode);

  if (!possibleCountries) {
    return [];
  }

  return possibleCountries.filter(function (country) {
    return couldNationalNumberBelongToCountry(nationalNumber, country, metadata);
  });
}

function couldNationalNumberBelongToCountry(nationalNumber, country, metadata) {
  var _metadata = new Metadata(metadata);

  _metadata.selectNumberingPlan(country);

  if (_metadata.numberingPlan.possibleLengths().indexOf(nationalNumber.length) >= 0) {
    return true;
  }

  return false;
}
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