github.com/nektos/act@v0.2.63/pkg/runner/testdata/actions/node16/node_modules/uuid/dist/esm-node/v1.js (about)

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