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59 lines
1.3 KiB
TypeScript
59 lines
1.3 KiB
TypeScript
// Loaded from https://deno.land/x/segno@v1.1.0/lib/validations/isISBN.ts
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// @ts-ignore allowing typedoc to build
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import { assertString } from '../helpers/assertString.ts';
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/**
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* @ignore
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*/
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const isbn10Maybe = /^(?:[0-9]{9}X|[0-9]{10})$/;
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/**
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* @ignore
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*/
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const isbn13Maybe = /^(?:[0-9]{13})$/;
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/**
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* @ignore
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*/
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const factor = [1, 3];
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export const isISBN = (str: string, version?: number): boolean => {
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assertString(str);
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const _version = version ? String(version) : '';
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if (!_version) {
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return isISBN(str, 10) || isISBN(str, 13);
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}
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const sanitized = str.replace(/[\s-]+/g, '');
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let checksum = 0;
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let i;
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if (_version === '10') {
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if (!isbn10Maybe.test(sanitized)) {
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return false;
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}
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for (i = 0; i < 9; i++) {
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checksum += (i + 1) * +sanitized.charAt(i);
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}
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if (sanitized.charAt(9) === 'X') {
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checksum += 10 * 10;
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} else {
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checksum += 10 * +sanitized.charAt(9);
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}
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if (checksum % 11 === 0) {
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return !!sanitized;
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}
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} else if (_version === '13') {
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if (!isbn13Maybe.test(sanitized)) {
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return false;
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}
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for (i = 0; i < 12; i++) {
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checksum += factor[i % 2] * +sanitized.charAt(i);
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}
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if (+sanitized.charAt(12) - ((10 - (checksum % 10)) % 10) === 0) {
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return !!sanitized;
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}
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}
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return false;
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};
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