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Diffstat (limited to 'node_modules/uuid/dist/esm-browser/v1.js')
-rw-r--r-- | node_modules/uuid/dist/esm-browser/v1.js | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/node_modules/uuid/dist/esm-browser/v1.js b/node_modules/uuid/dist/esm-browser/v1.js new file mode 100644 index 0000000..1a22591 --- /dev/null +++ b/node_modules/uuid/dist/esm-browser/v1.js @@ -0,0 +1,95 @@ +import rng from './rng.js'; +import stringify from './stringify.js'; // **`v1()` - Generate time-based UUID** +// +// Inspired by https://github.com/LiosK/UUID.js +// and http://docs.python.org/library/uuid.html + +var _nodeId; + +var _clockseq; // Previous uuid creation time + + +var _lastMSecs = 0; +var _lastNSecs = 0; // See https://github.com/uuidjs/uuid for API details + +function v1(options, buf, offset) { + var i = buf && offset || 0; + var b = buf || new Array(16); + options = options || {}; + var node = options.node || _nodeId; + var clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq; // node and clockseq need to be initialized to random values if they're not + // specified. We do this lazily to minimize issues related to insufficient + // system entropy. See #189 + + if (node == null || clockseq == null) { + var seedBytes = options.random || (options.rng || rng)(); + + if (node == null) { + // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1) + node = _nodeId = [seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5]]; + } + + if (clockseq == null) { + // Per 4.2.2, randomize (14 bit) clockseq + clockseq = _clockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff; + } + } // UUID timestamps are 100 nano-second units since the Gregorian epoch, + // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so + // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs' + // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00. + + + var msecs = options.msecs !== undefined ? options.msecs : Date.now(); // Per 4.2.1.2, use count of uuid's generated during the current clock + // cycle to simulate higher resolution clock + + var nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1; // Time since last uuid creation (in msecs) + + var dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000; // Per 4.2.1.2, Bump clockseq on clock regression + + if (dt < 0 && options.clockseq === undefined) { + clockseq = clockseq + 1 & 0x3fff; + } // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new + // time interval + + + if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) { + nsecs = 0; + } // Per 4.2.1.2 Throw error if too many uuids are requested + + + if (nsecs >= 10000) { + throw new Error("uuid.v1(): Can't create more than 10M uuids/sec"); + } + + _lastMSecs = msecs; + _lastNSecs = nsecs; + _clockseq = clockseq; // Per 4.1.4 - Convert from unix epoch to Gregorian epoch + + msecs += 12219292800000; // `time_low` + + var 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; // `time_mid` + + var tmh = msecs / 0x100000000 * 10000 & 0xfffffff; + b[i++] = tmh >>> 8 & 0xff; + b[i++] = tmh & 0xff; // `time_high_and_version` + + b[i++] = tmh >>> 24 & 0xf | 0x10; // include version + + b[i++] = tmh >>> 16 & 0xff; // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant) + + b[i++] = clockseq >>> 8 | 0x80; // `clock_seq_low` + + b[i++] = clockseq & 0xff; // `node` + + for (var n = 0; n < 6; ++n) { + b[i + n] = node[n]; + } + + return buf || stringify(b); +} + +export default v1;
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