libphonenumber-js/es6/helpers/stripIddPrefix.js

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

import Metadata from '../metadata.js';
import { VALID_DIGITS } from '../constants.js';
var CAPTURING_DIGIT_PATTERN = new RegExp('([' + VALID_DIGITS + '])');
export default function stripIddPrefix(number, country, callingCode, metadataJson) {
  if (!country) {
    return;
  }

  // Get the IDD prefix pattern.
  var metadata = new Metadata(metadataJson);
  metadata.selectNumberingPlan(country || callingCode);
  var IDDPrefixPattern = new RegExp(metadata.IDDPrefix());

  // Check if the number is IDD-prefixed.
  if (number.search(IDDPrefixPattern) !== 0) {
    return;
  }

  // Strip IDD prefix.
  number = number.slice(number.match(IDDPrefixPattern)[0].length);

  // If there're any digits after an IDD prefix,
  // then those digits are a country calling code.
  // Since no country code starts with a `0`,
  // the code below validates that the next digit (if present) is not `0`.
  var matchedGroups = number.match(CAPTURING_DIGIT_PATTERN);
  if (matchedGroups && matchedGroups[1] != null && matchedGroups[1].length > 0) {
    if (matchedGroups[1] === '0') {
      return;
    }
  }
  return number;
}
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