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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);
}
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