isISBN.js 1.4 KB

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  1. import assertString from './util/assertString';
  2. var possibleIsbn10 = /^(?:[0-9]{9}X|[0-9]{10})$/;
  3. var possibleIsbn13 = /^(?:[0-9]{13})$/;
  4. var factor = [1, 3];
  5. export default function isISBN(isbn, options) {
  6. assertString(isbn); // For backwards compatibility:
  7. // isISBN(str [, version]), i.e. `options` could be used as argument for the legacy `version`
  8. var version = String((options === null || options === void 0 ? void 0 : options.version) || options);
  9. if (!(options !== null && options !== void 0 && options.version || options)) {
  10. return isISBN(isbn, {
  11. version: 10
  12. }) || isISBN(isbn, {
  13. version: 13
  14. });
  15. }
  16. var sanitizedIsbn = isbn.replace(/[\s-]+/g, '');
  17. var checksum = 0;
  18. if (version === '10') {
  19. if (!possibleIsbn10.test(sanitizedIsbn)) {
  20. return false;
  21. }
  22. for (var i = 0; i < version - 1; i++) {
  23. checksum += (i + 1) * sanitizedIsbn.charAt(i);
  24. }
  25. if (sanitizedIsbn.charAt(9) === 'X') {
  26. checksum += 10 * 10;
  27. } else {
  28. checksum += 10 * sanitizedIsbn.charAt(9);
  29. }
  30. if (checksum % 11 === 0) {
  31. return true;
  32. }
  33. } else if (version === '13') {
  34. if (!possibleIsbn13.test(sanitizedIsbn)) {
  35. return false;
  36. }
  37. for (var _i = 0; _i < 12; _i++) {
  38. checksum += factor[_i % 2] * sanitizedIsbn.charAt(_i);
  39. }
  40. if (sanitizedIsbn.charAt(12) - (10 - checksum % 10) % 10 === 0) {
  41. return true;
  42. }
  43. }
  44. return false;
  45. }