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Viewing file:     extractNationalNumberFromPossiblyIncompleteNumber.js (5.33 KB)      -rw-r--r--

/**
 * Strips any national prefix (such as 0, 1) present in a
 * (possibly incomplete) number provided.
 * "Carrier codes" are only used  in Colombia and Brazil,
 * and only when dialing within those countries from a mobile phone to a fixed line number.
 * Sometimes it won't actually strip national prefix
 * and will instead prepend some digits to the `number`:
 * for example, when number `2345678` is passed with `VI` country selected,
 * it will return `{ number: "3402345678" }`, because `340` area code is prepended.
 * @param {string} number — National number digits.
 * @param {object} metadata — Metadata with country selected.
 * @return {object} `{ nationalNumber: string, nationalPrefix: string? carrierCode: string? }`.
 */
export default function extractNationalNumberFromPossiblyIncompleteNumber(number, metadata) {
  if (number && metadata.numberingPlan.nationalPrefixForParsing()) {
    // See METADATA.md for the description of
    // `national_prefix_for_parsing` and `national_prefix_transform_rule`.
    // Attempt to parse the first digits as a national prefix.
    var prefixPattern = new RegExp('^(?:' + metadata.numberingPlan.nationalPrefixForParsing() + ')');
    var prefixMatch = prefixPattern.exec(number);

    if (prefixMatch) {
      var nationalNumber;
      var carrierCode; // https://gitlab.com/catamphetamine/libphonenumber-js/-/blob/master/METADATA.md#national_prefix_for_parsing--national_prefix_transform_rule
      // If a `national_prefix_for_parsing` has any "capturing groups"
      // then it means that the national (significant) number is equal to
      // those "capturing groups" transformed via `national_prefix_transform_rule`,
      // and nothing could be said about the actual national prefix:
      // what is it and was it even there.
      // If a `national_prefix_for_parsing` doesn't have any "capturing groups",
      // then everything it matches is a national prefix.
      // To determine whether `national_prefix_for_parsing` matched any
      // "capturing groups", the value of the result of calling `.exec()`
      // is looked at, and if it has non-undefined values where there're
      // "capturing groups" in the regular expression, then it means
      // that "capturing groups" have been matched.
      // It's not possible to tell whether there'll be any "capturing gropus"
      // before the matching process, because a `national_prefix_for_parsing`
      // could exhibit both behaviors.

      var capturedGroupsCount = prefixMatch.length - 1;
      var hasCapturedGroups = capturedGroupsCount > 0 && prefixMatch[capturedGroupsCount];

      if (metadata.nationalPrefixTransformRule() && hasCapturedGroups) {
        nationalNumber = number.replace(prefixPattern, metadata.nationalPrefixTransformRule()); // If there's more than one captured group,
        // then carrier code is the second one.

        if (capturedGroupsCount > 1) {
          carrierCode = prefixMatch[1];
        }
      } // If there're no "capturing groups",
      // or if there're "capturing groups" but no
      // `national_prefix_transform_rule`,
      // then just strip the national prefix from the number,
      // and possibly a carrier code.
      // Seems like there could be more.
      else {
          // `prefixBeforeNationalNumber` is the whole substring matched by
          // the `national_prefix_for_parsing` regular expression.
          // There seem to be no guarantees that it's just a national prefix.
          // For example, if there's a carrier code, it's gonna be a
          // part of `prefixBeforeNationalNumber` too.
          var prefixBeforeNationalNumber = prefixMatch[0];
          nationalNumber = number.slice(prefixBeforeNationalNumber.length); // If there's at least one captured group,
          // then carrier code is the first one.

          if (hasCapturedGroups) {
            carrierCode = prefixMatch[1];
          }
        } // Tries to guess whether a national prefix was present in the input.
      // This is not something copy-pasted from Google's library:
      // they don't seem to have an equivalent for that.
      // So this isn't an "officially approved" way of doing something like that.
      // But since there seems no other existing method, this library uses it.


      var nationalPrefix;

      if (hasCapturedGroups) {
        var possiblePositionOfTheFirstCapturedGroup = number.indexOf(prefixMatch[1]);
        var possibleNationalPrefix = number.slice(0, possiblePositionOfTheFirstCapturedGroup); // Example: an Argentinian (AR) phone number `0111523456789`.
        // `prefixMatch[0]` is `01115`, and `$1` is `11`,
        // and the rest of the phone number is `23456789`.
        // The national number is transformed via `9$1` to `91123456789`.
        // National prefix `0` is detected being present at the start.
        // if (possibleNationalPrefix.indexOf(metadata.numberingPlan.nationalPrefix()) === 0) {

        if (possibleNationalPrefix === metadata.numberingPlan.nationalPrefix()) {
          nationalPrefix = metadata.numberingPlan.nationalPrefix();
        }
      } else {
        nationalPrefix = prefixMatch[0];
      }

      return {
        nationalNumber: nationalNumber,
        nationalPrefix: nationalPrefix,
        carrierCode: carrierCode
      };
    }
  }

  return {
    nationalNumber: number
  };
}
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