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backend/node_modules/effect/dist/esm/internal/random.js

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+import * as Chunk from "../Chunk.js";
+import * as Context from "../Context.js";
+import { pipe } from "../Function.js";
+import * as Hash from "../Hash.js";
+import * as PCGRandom from "../Utils.js";
+import * as core from "./core.js";
+/** @internal */
+const RandomSymbolKey = "effect/Random";
+/** @internal */
+export const RandomTypeId = /*#__PURE__*/Symbol.for(RandomSymbolKey);
+/** @internal */
+export const randomTag = /*#__PURE__*/Context.GenericTag("effect/Random");
+/** @internal */
+class RandomImpl {
+  seed;
+  [RandomTypeId] = RandomTypeId;
+  PRNG;
+  constructor(seed) {
+    this.seed = seed;
+    this.PRNG = new PCGRandom.PCGRandom(seed);
+  }
+  get next() {
+    return core.sync(() => this.PRNG.number());
+  }
+  get nextBoolean() {
+    return core.map(this.next, n => n > 0.5);
+  }
+  get nextInt() {
+    return core.sync(() => this.PRNG.integer(Number.MAX_SAFE_INTEGER));
+  }
+  nextRange(min, max) {
+    return core.map(this.next, n => (max - min) * n + min);
+  }
+  nextIntBetween(min, max) {
+    return core.sync(() => this.PRNG.integer(max - min) + min);
+  }
+  shuffle(elements) {
+    return shuffleWith(elements, n => this.nextIntBetween(0, n));
+  }
+}
+const shuffleWith = (elements, nextIntBounded) => {
+  return core.suspend(() => pipe(core.sync(() => Array.from(elements)), core.flatMap(buffer => {
+    const numbers = [];
+    for (let i = buffer.length; i >= 2; i = i - 1) {
+      numbers.push(i);
+    }
+    return pipe(numbers, core.forEachSequentialDiscard(n => pipe(nextIntBounded(n), core.map(k => swap(buffer, n - 1, k)))), core.as(Chunk.fromIterable(buffer)));
+  })));
+};
+const swap = (buffer, index1, index2) => {
+  const tmp = buffer[index1];
+  buffer[index1] = buffer[index2];
+  buffer[index2] = tmp;
+  return buffer;
+};
+export const make = seed => new RandomImpl(Hash.hash(seed));
+/** @internal */
+class FixedRandomImpl {
+  values;
+  [RandomTypeId] = RandomTypeId;
+  index = 0;
+  constructor(values) {
+    this.values = values;
+    if (values.length === 0) {
+      throw new Error("Requires at least one value");
+    }
+  }
+  getNextValue() {
+    const value = this.values[this.index];
+    this.index = (this.index + 1) % this.values.length;
+    return value;
+  }
+  get next() {
+    return core.sync(() => {
+      const value = this.getNextValue();
+      if (typeof value === "number") {
+        return Math.max(0, Math.min(1, value));
+      }
+      return Hash.hash(value) / 2147483647;
+    });
+  }
+  get nextBoolean() {
+    return core.sync(() => {
+      const value = this.getNextValue();
+      if (typeof value === "boolean") {
+        return value;
+      }
+      return Hash.hash(value) % 2 === 0;
+    });
+  }
+  get nextInt() {
+    return core.sync(() => {
+      const value = this.getNextValue();
+      if (typeof value === "number" && Number.isFinite(value)) {
+        return Math.round(value);
+      }
+      return Math.abs(Hash.hash(value));
+    });
+  }
+  nextRange(min, max) {
+    return core.map(this.next, n => (max - min) * n + min);
+  }
+  nextIntBetween(min, max) {
+    return core.sync(() => {
+      const value = this.getNextValue();
+      if (typeof value === "number" && Number.isFinite(value)) {
+        return Math.max(min, Math.min(max - 1, Math.round(value)));
+      }
+      const hash = Math.abs(Hash.hash(value));
+      return min + hash % (max - min);
+    });
+  }
+  shuffle(elements) {
+    return shuffleWith(elements, n => this.nextIntBetween(0, n));
+  }
+}
+/** @internal */
+export const fixed = values => new FixedRandomImpl(values);
+//# sourceMappingURL=random.js.map