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std/uuid/v1.ts

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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { bytesToUuid } from "./_common.ts";
const UUID_RE = new RegExp( "^[0-9a-f]{8}-[0-9a-f]{4}-1[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$", "i",);
export function validate(id: string): boolean { return UUID_RE.test(id);}
let _nodeId: number[];let _clockseq: number;
let _lastMSecs = 0;let _lastNSecs = 0;
type V1Options = { node?: number[]; clockseq?: number; msecs?: number; nsecs?: number; random?: number[]; rng?: () => number[];};
export function generate( options?: V1Options | null, buf?: number[], offset?: number,): string | number[] { let i = (buf && offset) || 0; const b = buf || [];
options = options || {}; let node = options.node || _nodeId; let clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq;
if (node == null || clockseq == null) { // eslint-disable-next-line @typescript-eslint/no-explicit-any const seedBytes: any = options.random || options.rng || crypto.getRandomValues(new Uint8Array(16)); if (node == null) { node = _nodeId = [ seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5], ]; } if (clockseq == null) { clockseq = _clockseq = ((seedBytes[6] << 8) | seedBytes[7]) & 0x3fff; } } let msecs = options.msecs !== undefined ? options.msecs : new Date().getTime();
let nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1;
const dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000;
if (dt < 0 && options.clockseq === undefined) { clockseq = (clockseq + 1) & 0x3fff; }
if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) { nsecs = 0; }
if (nsecs >= 10000) { throw new Error("Can't create more than 10M uuids/sec"); }
_lastMSecs = msecs; _lastNSecs = nsecs; _clockseq = clockseq;
msecs += 12219292800000;
const tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000; b[i++] = (tl >>> 24) & 0xff; b[i++] = (tl >>> 16) & 0xff; b[i++] = (tl >>> 8) & 0xff; b[i++] = tl & 0xff;
const tmh = ((msecs / 0x100000000) * 10000) & 0xfffffff; b[i++] = (tmh >>> 8) & 0xff; b[i++] = tmh & 0xff;
b[i++] = ((tmh >>> 24) & 0xf) | 0x10; b[i++] = (tmh >>> 16) & 0xff;
b[i++] = (clockseq >>> 8) | 0x80;
b[i++] = clockseq & 0xff;
for (let n = 0; n < 6; ++n) { b[i + n] = node[n]; }
return buf ? buf : bytesToUuid(b);}