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uuidjs-uuid
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src/stringify.js
57 строк
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Robert Kieffer
fix: revert "perf: remove superfluous call to toLowerCase (#677)" (#738)
12 окт 2023, 01:48
Не верифицирован
12 окт 2023, 01:48
e267b90
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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 // // Note to future-self: No, you can't remove the `toLowerCase()` call. // REF: https://github.com/uuidjs/uuid/pull/677#issuecomment-1757351351 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]] ).toLowerCase(); } 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;