27 lines
1.1 KiB
JavaScript
27 lines
1.1 KiB
JavaScript
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import assertString from './util/assertString';
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// https://en.wikipedia.org/wiki/ISO_6346
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// according to ISO6346 standard, checksum digit is mandatory for freight container but recommended
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// for other container types (J and Z)
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var isISO6346Str = /^[A-Z]{3}(U[0-9]{7})|([J,Z][0-9]{6,7})$/;
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var isDigit = /^[0-9]$/;
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export function isISO6346(str) {
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assertString(str);
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str = str.toUpperCase();
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if (!isISO6346Str.test(str)) return false;
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if (str.length === 11) {
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var sum = 0;
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for (var i = 0; i < str.length - 1; i++) {
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if (!isDigit.test(str[i])) {
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var convertedCode = void 0;
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var letterCode = str.charCodeAt(i) - 55;
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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;
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sum += convertedCode * Math.pow(2, i);
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} else sum += str[i] * Math.pow(2, i);
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}
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var checkSumDigit = sum % 11;
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return Number(str[str.length - 1]) === checkSumDigit;
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}
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return true;
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}
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export var isFreightContainerID = isISO6346;
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