128 lines
4.4 KiB
JavaScript
128 lines
4.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.randomTag = exports.make = exports.fixed = exports.RandomTypeId = void 0;
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var Chunk = _interopRequireWildcard(require("../Chunk.js"));
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var Context = _interopRequireWildcard(require("../Context.js"));
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var _Function = require("../Function.js");
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var Hash = _interopRequireWildcard(require("../Hash.js"));
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var PCGRandom = _interopRequireWildcard(require("../Utils.js"));
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var core = _interopRequireWildcard(require("./core.js"));
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function _interopRequireWildcard(e, t) { if ("function" == typeof WeakMap) var r = new WeakMap(), n = new WeakMap(); return (_interopRequireWildcard = function (e, t) { if (!t && e && e.__esModule) return e; var o, i, f = { __proto__: null, default: e }; if (null === e || "object" != typeof e && "function" != typeof e) return f; if (o = t ? n : r) { if (o.has(e)) return o.get(e); o.set(e, f); } for (const t in e) "default" !== t && {}.hasOwnProperty.call(e, t) && ((i = (o = Object.defineProperty) && Object.getOwnPropertyDescriptor(e, t)) && (i.get || i.set) ? o(f, t, i) : f[t] = e[t]); return f; })(e, t); }
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/** @internal */
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const RandomSymbolKey = "effect/Random";
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/** @internal */
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const RandomTypeId = exports.RandomTypeId = /*#__PURE__*/Symbol.for(RandomSymbolKey);
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/** @internal */
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const randomTag = exports.randomTag = /*#__PURE__*/Context.GenericTag("effect/Random");
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/** @internal */
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class RandomImpl {
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seed;
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[RandomTypeId] = RandomTypeId;
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PRNG;
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constructor(seed) {
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this.seed = seed;
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this.PRNG = new PCGRandom.PCGRandom(seed);
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}
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get next() {
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return core.sync(() => this.PRNG.number());
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}
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get nextBoolean() {
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return core.map(this.next, n => n > 0.5);
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}
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get nextInt() {
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return core.sync(() => this.PRNG.integer(Number.MAX_SAFE_INTEGER));
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}
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nextRange(min, max) {
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return core.map(this.next, n => (max - min) * n + min);
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}
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nextIntBetween(min, max) {
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return core.sync(() => this.PRNG.integer(max - min) + min);
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}
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shuffle(elements) {
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return shuffleWith(elements, n => this.nextIntBetween(0, n));
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}
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}
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const shuffleWith = (elements, nextIntBounded) => {
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return core.suspend(() => (0, _Function.pipe)(core.sync(() => Array.from(elements)), core.flatMap(buffer => {
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const numbers = [];
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for (let i = buffer.length; i >= 2; i = i - 1) {
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numbers.push(i);
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}
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return (0, _Function.pipe)(numbers, core.forEachSequentialDiscard(n => (0, _Function.pipe)(nextIntBounded(n), core.map(k => swap(buffer, n - 1, k)))), core.as(Chunk.fromIterable(buffer)));
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})));
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};
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const swap = (buffer, index1, index2) => {
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const tmp = buffer[index1];
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buffer[index1] = buffer[index2];
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buffer[index2] = tmp;
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return buffer;
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};
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const make = seed => new RandomImpl(Hash.hash(seed));
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/** @internal */
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exports.make = make;
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class FixedRandomImpl {
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values;
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[RandomTypeId] = RandomTypeId;
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index = 0;
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constructor(values) {
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this.values = values;
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if (values.length === 0) {
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throw new Error("Requires at least one value");
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}
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}
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getNextValue() {
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const value = this.values[this.index];
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this.index = (this.index + 1) % this.values.length;
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return value;
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}
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get next() {
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return core.sync(() => {
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const value = this.getNextValue();
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if (typeof value === "number") {
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return Math.max(0, Math.min(1, value));
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}
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return Hash.hash(value) / 2147483647;
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});
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}
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get nextBoolean() {
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return core.sync(() => {
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const value = this.getNextValue();
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if (typeof value === "boolean") {
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return value;
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}
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return Hash.hash(value) % 2 === 0;
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});
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}
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get nextInt() {
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return core.sync(() => {
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const value = this.getNextValue();
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if (typeof value === "number" && Number.isFinite(value)) {
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return Math.round(value);
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}
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return Math.abs(Hash.hash(value));
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});
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}
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nextRange(min, max) {
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return core.map(this.next, n => (max - min) * n + min);
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}
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nextIntBetween(min, max) {
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return core.sync(() => {
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const value = this.getNextValue();
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if (typeof value === "number" && Number.isFinite(value)) {
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return Math.max(min, Math.min(max - 1, Math.round(value)));
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}
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const hash = Math.abs(Hash.hash(value));
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return min + hash % (max - min);
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});
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}
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shuffle(elements) {
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return shuffleWith(elements, n => this.nextIntBetween(0, n));
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}
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}
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/** @internal */
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const fixed = values => new FixedRandomImpl(values);
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exports.fixed = fixed;
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//# sourceMappingURL=random.js.map
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