.

qwen/nodejs/node_modules/validator/lib/isISO6346.js

@@ -0,0 +1,35 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.isFreightContainerID = void 0;
+exports.isISO6346 = isISO6346;
+var _assertString = _interopRequireDefault(require("./util/assertString"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+// 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;
+    if (checkSumDigit === 10) checkSumDigit = 0;
+    return Number(str[str.length - 1]) === checkSumDigit;
+  }
+  return true;
+}
+var isFreightContainerID = exports.isFreightContainerID = isISO6346;