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9.9 KiB
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9.9 KiB
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{"ast":null,"code":"import rng from './rng.js';\nimport { unsafeStringify } from './stringify.js'; // **`v1()` - Generate time-based UUID**\n//\n// Inspired by https://github.com/LiosK/UUID.js\n// and http://docs.python.org/library/uuid.html\n\nlet _nodeId;\nlet _clockseq; // Previous uuid creation time\n\nlet _lastMSecs = 0;\nlet _lastNSecs = 0; // See https://github.com/uuidjs/uuid for API details\n\nfunction v1(options, buf, offset) {\n let i = buf && offset || 0;\n const b = buf || new Array(16);\n options = options || {};\n let node = options.node || _nodeId;\n let clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq; // node and clockseq need to be initialized to random values if they're not\n // specified. We do this lazily to minimize issues related to insufficient\n // system entropy. See #189\n\n if (node == null || clockseq == null) {\n const seedBytes = options.random || (options.rng || rng)();\n if (node == null) {\n // Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)\n node = _nodeId = [seedBytes[0] | 0x01, seedBytes[1], seedBytes[2], seedBytes[3], seedBytes[4], seedBytes[5]];\n }\n if (clockseq == null) {\n // Per 4.2.2, randomize (14 bit) clockseq\n clockseq = _clockseq = (seedBytes[6] << 8 | seedBytes[7]) & 0x3fff;\n }\n } // UUID timestamps are 100 nano-second units since the Gregorian epoch,\n // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so\n // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'\n // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.\n\n let msecs = options.msecs !== undefined ? options.msecs : Date.now(); // Per 4.2.1.2, use count of uuid's generated during the current clock\n // cycle to simulate higher resolution clock\n\n let nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1; // Time since last uuid creation (in msecs)\n\n const dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000; // Per 4.2.1.2, Bump clockseq on clock regression\n\n if (dt < 0 && options.clockseq === undefined) {\n clockseq = clockseq + 1 & 0x3fff;\n } // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new\n // time interval\n\n if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {\n nsecs = 0;\n } // Per 4.2.1.2 Throw error if too many uuids are requested\n\n if (nsecs >= 10000) {\n throw new Error(\"uuid.v1(): Can't create more than 10M uuids/sec\");\n }\n _lastMSecs = msecs;\n _lastNSecs = nsecs;\n _clockseq = clockseq; // Per 4.1.4 - Convert from unix epoch to Gregorian epoch\n\n msecs += 12219292800000; // `time_low`\n\n const tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;\n b[i++] = tl >>> 24 & 0xff;\n b[i++] = tl >>> 16 & 0xff;\n b[i++] = tl >>> 8 & 0xff;\n b[i++] = tl & 0xff; // `time_mid`\n\n const tmh = msecs / 0x100000000 * 10000 & 0xfffffff;\n b[i++] = tmh >>> 8 & 0xff;\n b[i++] = tmh & 0xff; // `time_high_and_version`\n\n b[i++] = tmh >>> 24 & 0xf | 0x10; // include version\n\n b[i++] = tmh >>> 16 & 0xff; // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)\n\n b[i++] = clockseq >>> 8 | 0x80; // `clock_seq_low`\n\n b[i++] = clockseq & 0xff; // `node`\n\n for (let n = 0; n < 6; ++n) {\n b[i + n] = node[n];\n }\n return buf || unsafeStringify(b);\n}\nexport default v1;","map":{"version":3,"names":["rng","unsafeStringify","_nodeId","_clockseq","_lastMSecs","_lastNSecs","v1","options","buf","offset","i","b","Array","node","clockseq","undefined","seedBytes","random","msecs","Date","now","nsecs","dt","Error","tl","tmh","n"],"sources":["D:/20240802/client/node_modules/uuid/dist/esm-browser/v1.js"],"sourcesContent":["import rng from './rng.js';\nimport { unsafeStringify } from './stringify.js'; // **`v1()` - Generate time-based UUID**\n//\n// Inspired by https://github.com/LiosK/UUID.js\n// and http://docs.python.org/library/uuid.html\n\nlet _nodeId;\n\nlet _clockseq; // Previous uuid creation time\n\n\nlet _lastMSecs = 0;\nlet _lastNSecs
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