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Viewing file:     isISO6346.js (1.45 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isFreightContainerID = void 0;
exports.isISO6346 = isISO6346;
var _assertString = _interopRequireDefault(require("./util/assertString"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
// https://en.wikipedia.org/wiki/ISO_6346
// according to ISO6346 standard, checksum digit is mandatory for freight container but recommended
// for other container types (J and Z)
var isISO6346Str = /^[A-Z]{3}(U[0-9]{7})|([J,Z][0-9]{6,7})$/;
var isDigit = /^[0-9]$/;
function isISO6346(str) {
  (0, _assertString.default)(str);
  str = str.toUpperCase();
  if (!isISO6346Str.test(str)) return false;
  if (str.length === 11) {
    var sum = 0;
    for (var i = 0; i < str.length - 1; i++) {
      if (!isDigit.test(str[i])) {
        var convertedCode = void 0;
        var letterCode = str.charCodeAt(i) - 55;
        if (letterCode < 11) convertedCode = letterCode;else if (letterCode >= 11 && letterCode <= 20) convertedCode = 12 + letterCode % 11;else if (letterCode >= 21 && letterCode <= 30) convertedCode = 23 + letterCode % 21;else convertedCode = 34 + letterCode % 31;
        sum += convertedCode * Math.pow(2, i);
      } else sum += str[i] * Math.pow(2, i);
    }
    var checkSumDigit = sum % 11;
    return Number(str[str.length - 1]) === checkSumDigit;
  }
  return true;
}
var isFreightContainerID = exports.isFreightContainerID = isISO6346;