stringify.js 1.4 KB

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