1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = isISBN;
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7 |
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8 | var _assertString = _interopRequireDefault(require("./util/assertString"));
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9 |
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10 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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11 |
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12 | var isbn10Maybe = /^(?:[0-9]{9}X|[0-9]{10})$/;
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13 | var isbn13Maybe = /^(?:[0-9]{13})$/;
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14 | var factor = [1, 3];
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15 |
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16 | function isISBN(str) {
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17 | var version = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
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18 | (0, _assertString.default)(str);
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19 | version = String(version);
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20 |
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21 | if (!version) {
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22 | return isISBN(str, 10) || isISBN(str, 13);
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23 | }
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24 |
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25 | var sanitized = str.replace(/[\s-]+/g, '');
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26 | var checksum = 0;
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27 | var i;
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28 |
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29 | if (version === '10') {
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30 | if (!isbn10Maybe.test(sanitized)) {
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31 | return false;
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32 | }
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33 |
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34 | for (i = 0; i < 9; i++) {
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35 | checksum += (i + 1) * sanitized.charAt(i);
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36 | }
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37 |
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38 | if (sanitized.charAt(9) === 'X') {
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39 | checksum += 10 * 10;
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40 | } else {
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41 | checksum += 10 * sanitized.charAt(9);
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42 | }
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43 |
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44 | if (checksum % 11 === 0) {
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45 | return !!sanitized;
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46 | }
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47 | } else if (version === '13') {
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48 | if (!isbn13Maybe.test(sanitized)) {
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49 | return false;
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50 | }
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51 |
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52 | for (i = 0; i < 12; i++) {
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53 | checksum += factor[i % 2] * sanitized.charAt(i);
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54 | }
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55 |
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56 | if (sanitized.charAt(12) - (10 - checksum % 10) % 10 === 0) {
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57 | return !!sanitized;
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58 | }
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59 | }
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60 |
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61 | return false;
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62 | }
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63 |
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64 | module.exports = exports.default; |
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