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stringify.js1.4 KB · 33 lines
import validate from './validate.js';/** * Convert array of 16 byte values to UUID string format of the form: * XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX */ const byteToHex = []; for (let i = 0; i < 256; ++i) {  byteToHex.push((i + 0x100).toString(16).slice(1));} export function unsafeStringify(arr, offset = 0) {  // Note: Be careful editing this code!  It's been tuned for performance  // and works in ways you may not expect. See https://github.com/uuidjs/uuid/pull/434  return 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]];} function stringify(arr, offset = 0) {  const uuid = unsafeStringify(arr, offset); // Consistency check for valid UUID.  If this throws, it's likely due to one  // of the following:  // - One or more input array values don't map to a hex octet (leading to  // "undefined" in the uuid)  // - Invalid input values for the RFC `version` or `variant` fields   if (!validate(uuid)) {    throw TypeError('Stringified UUID is invalid');  }   return uuid;} export default stringify;