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on this file since 6c1585f was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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1 | import validate from './validate.js';
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2 | /**
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3 | * Convert array of 16 byte values to UUID string format of the form:
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4 | * XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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5 | */
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6 |
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7 | var byteToHex = [];
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8 |
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9 | for (var i = 0; i < 256; ++i) {
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10 | byteToHex.push((i + 0x100).toString(16).substr(1));
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11 | }
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12 |
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13 | function stringify(arr) {
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14 | var offset = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
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15 | // Note: Be careful editing this code! It's been tuned for performance
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16 | // and works in ways you may not expect. See https://github.com/uuidjs/uuid/pull/434
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17 | var uuid = (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + '-' + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + '-' + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + '-' + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + '-' + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase(); // Consistency check for valid UUID. If this throws, it's likely due to one
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18 | // of the following:
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19 | // - One or more input array values don't map to a hex octet (leading to
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20 | // "undefined" in the uuid)
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21 | // - Invalid input values for the RFC `version` or `variant` fields
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22 |
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23 | if (!validate(uuid)) {
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24 | throw TypeError('Stringified UUID is invalid');
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25 | }
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26 |
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27 | return uuid;
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28 | }
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29 |
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30 | export default stringify; |
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