[6a3a178] | 1 | "use strict";
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| 2 |
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| 3 | Object.defineProperty(exports, "__esModule", {
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| 4 | value: true
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| 5 | });
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| 6 | exports.default = void 0;
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| 7 |
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| 8 | var _rng = _interopRequireDefault(require("./rng.js"));
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| 9 |
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| 10 | var _stringify = _interopRequireDefault(require("./stringify.js"));
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| 11 |
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| 12 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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| 13 |
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| 14 | // **`v1()` - Generate time-based UUID**
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| 15 | //
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| 16 | // Inspired by https://github.com/LiosK/UUID.js
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| 17 | // and http://docs.python.org/library/uuid.html
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| 18 | let _nodeId;
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| 19 |
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| 20 | let _clockseq; // Previous uuid creation time
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| 21 |
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| 22 |
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| 23 | let _lastMSecs = 0;
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| 24 | let _lastNSecs = 0; // See https://github.com/uuidjs/uuid for API details
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| 25 |
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| 26 | function v1(options, buf, offset) {
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| 27 | let i = buf && offset || 0;
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| 28 | const b = buf || new Array(16);
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| 29 | options = options || {};
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| 30 | let node = options.node || _nodeId;
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| 31 | let clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq; // node and clockseq need to be initialized to random values if they're not
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| 32 | // specified. We do this lazily to minimize issues related to insufficient
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| 33 | // system entropy. See #189
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| 34 |
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| 35 | if (node == null || clockseq == null) {
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| 36 | const seedBytes = options.random || (options.rng || _rng.default)();
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| 37 |
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| 38 | if (node == null) {
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| 39 | // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)
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| 40 | node = _nodeId = [seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5]];
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| 41 | }
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| 42 |
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| 43 | if (clockseq == null) {
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| 44 | // Per 4.2.2, randomize (14 bit) clockseq
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| 45 | clockseq = _clockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff;
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| 46 | }
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| 47 | } // UUID timestamps are 100 nano-second units since the Gregorian epoch,
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| 48 | // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so
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| 49 | // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
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| 50 | // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
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| 51 |
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| 52 |
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| 53 | let msecs = options.msecs !== undefined ? options.msecs : Date.now(); // Per 4.2.1.2, use count of uuid's generated during the current clock
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| 54 | // cycle to simulate higher resolution clock
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| 55 |
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| 56 | let nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1; // Time since last uuid creation (in msecs)
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| 57 |
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| 58 | const dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000; // Per 4.2.1.2, Bump clockseq on clock regression
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| 59 |
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| 60 | if (dt < 0 && options.clockseq === undefined) {
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| 61 | clockseq = clockseq + 1 & 0x3fff;
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| 62 | } // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new
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| 63 | // time interval
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| 64 |
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| 65 |
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| 66 | if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {
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| 67 | nsecs = 0;
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| 68 | } // Per 4.2.1.2 Throw error if too many uuids are requested
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| 69 |
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| 70 |
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| 71 | if (nsecs >= 10000) {
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| 72 | throw new Error("uuid.v1(): Can't create more than 10M uuids/sec");
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| 73 | }
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| 74 |
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| 75 | _lastMSecs = msecs;
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| 76 | _lastNSecs = nsecs;
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| 77 | _clockseq = clockseq; // Per 4.1.4 - Convert from unix epoch to Gregorian epoch
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| 78 |
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| 79 | msecs += 12219292800000; // `time_low`
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| 80 |
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| 81 | const tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
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| 82 | b[i++] = tl >>> 24 & 0xff;
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| 83 | b[i++] = tl >>> 16 & 0xff;
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| 84 | b[i++] = tl >>> 8 & 0xff;
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| 85 | b[i++] = tl & 0xff; // `time_mid`
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| 86 |
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| 87 | const tmh = msecs / 0x100000000 * 10000 & 0xfffffff;
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| 88 | b[i++] = tmh >>> 8 & 0xff;
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| 89 | b[i++] = tmh & 0xff; // `time_high_and_version`
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| 90 |
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| 91 | b[i++] = tmh >>> 24 & 0xf | 0x10; // include version
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| 92 |
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| 93 | b[i++] = tmh >>> 16 & 0xff; // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
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| 94 |
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| 95 | b[i++] = clockseq >>> 8 | 0x80; // `clock_seq_low`
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| 96 |
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| 97 | b[i++] = clockseq & 0xff; // `node`
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| 98 |
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| 99 | for (let n = 0; n < 6; ++n) {
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| 100 | b[i + n] = node[n];
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| 101 | }
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| 102 |
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| 103 | return buf || (0, _stringify.default)(b);
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| 104 | }
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| 105 |
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| 106 | var _default = v1;
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| 107 | exports.default = _default; |
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