65 lines
1.4 KiB
JavaScript
65 lines
1.4 KiB
JavaScript
"use strict";
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
exports.default = isISBN;
|
|
|
|
var _assertString = _interopRequireDefault(require("./util/assertString"));
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
var isbn10Maybe = /^(?:[0-9]{9}X|[0-9]{10})$/;
|
|
var isbn13Maybe = /^(?:[0-9]{13})$/;
|
|
var factor = [1, 3];
|
|
|
|
function isISBN(str) {
|
|
var version = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
|
|
(0, _assertString.default)(str);
|
|
version = String(version);
|
|
|
|
if (!version) {
|
|
return isISBN(str, 10) || isISBN(str, 13);
|
|
}
|
|
|
|
var sanitized = str.replace(/[\s-]+/g, '');
|
|
var checksum = 0;
|
|
var i;
|
|
|
|
if (version === '10') {
|
|
if (!isbn10Maybe.test(sanitized)) {
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < 9; i++) {
|
|
checksum += (i + 1) * sanitized.charAt(i);
|
|
}
|
|
|
|
if (sanitized.charAt(9) === 'X') {
|
|
checksum += 10 * 10;
|
|
} else {
|
|
checksum += 10 * sanitized.charAt(9);
|
|
}
|
|
|
|
if (checksum % 11 === 0) {
|
|
return !!sanitized;
|
|
}
|
|
} else if (version === '13') {
|
|
if (!isbn13Maybe.test(sanitized)) {
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < 12; i++) {
|
|
checksum += factor[i % 2] * sanitized.charAt(i);
|
|
}
|
|
|
|
if (sanitized.charAt(12) - (10 - checksum % 10) % 10 === 0) {
|
|
return !!sanitized;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
module.exports = exports.default;
|
|
module.exports.default = exports.default; |