source: trip-planner-front/node_modules/uuid/dist/v1.js@ 6a80231

Last change on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 3.5 KB
Line 
1"use strict";
2
3Object.defineProperty(exports, "__esModule", {
4 value: true
5});
6exports.default = void 0;
7
8var _rng = _interopRequireDefault(require("./rng.js"));
9
10var _stringify = _interopRequireDefault(require("./stringify.js"));
11
12function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
13
14// **`v1()` - Generate time-based UUID**
15//
16// Inspired by https://github.com/LiosK/UUID.js
17// and http://docs.python.org/library/uuid.html
18let _nodeId;
19
20let _clockseq; // Previous uuid creation time
21
22
23let _lastMSecs = 0;
24let _lastNSecs = 0; // See https://github.com/uuidjs/uuid for API details
25
26function v1(options, buf, offset) {
27 let i = buf && offset || 0;
28 const b = buf || new Array(16);
29 options = options || {};
30 let node = options.node || _nodeId;
31 let clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq; // node and clockseq need to be initialized to random values if they're not
32 // specified. We do this lazily to minimize issues related to insufficient
33 // system entropy. See #189
34
35 if (node == null || clockseq == null) {
36 const seedBytes = options.random || (options.rng || _rng.default)();
37
38 if (node == null) {
39 // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)
40 node = _nodeId = [seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5]];
41 }
42
43 if (clockseq == null) {
44 // Per 4.2.2, randomize (14 bit) clockseq
45 clockseq = _clockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff;
46 }
47 } // UUID timestamps are 100 nano-second units since the Gregorian epoch,
48 // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so
49 // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
50 // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
51
52
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
54 // cycle to simulate higher resolution clock
55
56 let nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1; // Time since last uuid creation (in msecs)
57
58 const dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000; // Per 4.2.1.2, Bump clockseq on clock regression
59
60 if (dt < 0 && options.clockseq === undefined) {
61 clockseq = clockseq + 1 & 0x3fff;
62 } // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new
63 // time interval
64
65
66 if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {
67 nsecs = 0;
68 } // Per 4.2.1.2 Throw error if too many uuids are requested
69
70
71 if (nsecs >= 10000) {
72 throw new Error("uuid.v1(): Can't create more than 10M uuids/sec");
73 }
74
75 _lastMSecs = msecs;
76 _lastNSecs = nsecs;
77 _clockseq = clockseq; // Per 4.1.4 - Convert from unix epoch to Gregorian epoch
78
79 msecs += 12219292800000; // `time_low`
80
81 const tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
82 b[i++] = tl >>> 24 & 0xff;
83 b[i++] = tl >>> 16 & 0xff;
84 b[i++] = tl >>> 8 & 0xff;
85 b[i++] = tl & 0xff; // `time_mid`
86
87 const tmh = msecs / 0x100000000 * 10000 & 0xfffffff;
88 b[i++] = tmh >>> 8 & 0xff;
89 b[i++] = tmh & 0xff; // `time_high_and_version`
90
91 b[i++] = tmh >>> 24 & 0xf | 0x10; // include version
92
93 b[i++] = tmh >>> 16 & 0xff; // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
94
95 b[i++] = clockseq >>> 8 | 0x80; // `clock_seq_low`
96
97 b[i++] = clockseq & 0xff; // `node`
98
99 for (let n = 0; n < 6; ++n) {
100 b[i + n] = node[n];
101 }
102
103 return buf || (0, _stringify.default)(b);
104}
105
106var _default = v1;
107exports.default = _default;
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