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backend/node_modules/pure-rand/lib/generator/MersenneTwister.js

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+"use strict";
+var __read = (this && this.__read) || function (o, n) {
+    var m = typeof Symbol === "function" && o[Symbol.iterator];
+    if (!m) return o;
+    var i = m.call(o), r, ar = [], e;
+    try {
+        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
+    }
+    catch (error) { e = { error: error }; }
+    finally {
+        try {
+            if (r && !r.done && (m = i["return"])) m.call(i);
+        }
+        finally { if (e) throw e.error; }
+    }
+    return ar;
+};
+var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
+    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
+        if (ar || !(i in from)) {
+            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
+            ar[i] = from[i];
+        }
+    }
+    return to.concat(ar || Array.prototype.slice.call(from));
+};
+exports.__esModule = true;
+var MersenneTwister = (function () {
+    function MersenneTwister(states, index) {
+        this.states = states;
+        this.index = index;
+    }
+    MersenneTwister.twist = function (prev) {
+        var mt = prev.slice();
+        for (var idx = 0; idx !== MersenneTwister.N - MersenneTwister.M; ++idx) {
+            var y_1 = (mt[idx] & MersenneTwister.MASK_UPPER) + (mt[idx + 1] & MersenneTwister.MASK_LOWER);
+            mt[idx] = mt[idx + MersenneTwister.M] ^ (y_1 >>> 1) ^ (-(y_1 & 1) & MersenneTwister.A);
+        }
+        for (var idx = MersenneTwister.N - MersenneTwister.M; idx !== MersenneTwister.N - 1; ++idx) {
+            var y_2 = (mt[idx] & MersenneTwister.MASK_UPPER) + (mt[idx + 1] & MersenneTwister.MASK_LOWER);
+            mt[idx] = mt[idx + MersenneTwister.M - MersenneTwister.N] ^ (y_2 >>> 1) ^ (-(y_2 & 1) & MersenneTwister.A);
+        }
+        var y = (mt[MersenneTwister.N - 1] & MersenneTwister.MASK_UPPER) + (mt[0] & MersenneTwister.MASK_LOWER);
+        mt[MersenneTwister.N - 1] = mt[MersenneTwister.M - 1] ^ (y >>> 1) ^ (-(y & 1) & MersenneTwister.A);
+        return mt;
+    };
+    MersenneTwister.seeded = function (seed) {
+        var out = Array(MersenneTwister.N);
+        out[0] = seed;
+        for (var idx = 1; idx !== MersenneTwister.N; ++idx) {
+            var xored = out[idx - 1] ^ (out[idx - 1] >>> 30);
+            out[idx] = (Math.imul(MersenneTwister.F, xored) + idx) | 0;
+        }
+        return out;
+    };
+    MersenneTwister.from = function (seed) {
+        return new MersenneTwister(MersenneTwister.twist(MersenneTwister.seeded(seed)), 0);
+    };
+    MersenneTwister.prototype.clone = function () {
+        return new MersenneTwister(this.states, this.index);
+    };
+    MersenneTwister.prototype.next = function () {
+        var nextRng = new MersenneTwister(this.states, this.index);
+        var out = nextRng.unsafeNext();
+        return [out, nextRng];
+    };
+    MersenneTwister.prototype.unsafeNext = function () {
+        var y = this.states[this.index];
+        y ^= this.states[this.index] >>> MersenneTwister.U;
+        y ^= (y << MersenneTwister.S) & MersenneTwister.B;
+        y ^= (y << MersenneTwister.T) & MersenneTwister.C;
+        y ^= y >>> MersenneTwister.L;
+        if (++this.index >= MersenneTwister.N) {
+            this.states = MersenneTwister.twist(this.states);
+            this.index = 0;
+        }
+        return y;
+    };
+    MersenneTwister.prototype.getState = function () {
+        return __spreadArray([this.index], __read(this.states), false);
+    };
+    MersenneTwister.fromState = function (state) {
+        var valid = state.length === MersenneTwister.N + 1 && state[0] >= 0 && state[0] < MersenneTwister.N;
+        if (!valid) {
+            throw new Error('The state must have been produced by a mersenne RandomGenerator');
+        }
+        return new MersenneTwister(state.slice(1), state[0]);
+    };
+    MersenneTwister.N = 624;
+    MersenneTwister.M = 397;
+    MersenneTwister.R = 31;
+    MersenneTwister.A = 0x9908b0df;
+    MersenneTwister.F = 1812433253;
+    MersenneTwister.U = 11;
+    MersenneTwister.S = 7;
+    MersenneTwister.B = 0x9d2c5680;
+    MersenneTwister.T = 15;
+    MersenneTwister.C = 0xefc60000;
+    MersenneTwister.L = 18;
+    MersenneTwister.MASK_LOWER = Math.pow(2, MersenneTwister.R) - 1;
+    MersenneTwister.MASK_UPPER = Math.pow(2, MersenneTwister.R);
+    return MersenneTwister;
+}());
+function fromState(state) {
+    return MersenneTwister.fromState(state);
+}
+exports["default"] = Object.assign(function (seed) {
+    return MersenneTwister.from(seed);
+}, { fromState: fromState });