refactor!: reorganize src folder (#909)

1 files changed, 73 insertions, 0 deletions

diff --git a/src/modules/mersenne/index.ts b/src/modules/mersenne/index.ts
new file mode 100644
index 00000000..33e610f8
--- /dev/null
+++ b/src/modules/mersenne/index.ts
@@ -0,0 +1,73 @@
+import { FakerError } from '../../errors/faker-error';
+import Gen from './twister';
+
+/**
+ * Module to generate seed based random numbers.
+ */
+export class Mersenne {
+  private gen = new Gen();
+
+  constructor() {
+    this.gen.initGenrand(new Date().getTime() % 1000000000);
+
+    // Bind `this` so namespaced is working correctly
+    for (const name of Object.getOwnPropertyNames(Mersenne.prototype)) {
+      if (name === 'constructor' || typeof this[name] !== 'function') {
+        continue;
+      }
+      this[name] = this[name].bind(this);
+    }
+  }
+
+  /**
+   * Generates a random number between `[min, max)`.
+   *
+   * @param max The maximum number. Defaults to `0`.
+   * @param min The minimum number. Defaults to `32768`.
+   *
+   * @example
+   * faker.mersenne.rand() // 15515
+   * faker.mersenne.rand(500, 1000) // 578
+   */
+  rand(max = 32768, min = 0): number {
+    if (min > max) {
+      const temp = min;
+      min = max;
+      max = temp;
+    }
+
+    return Math.floor(this.gen.genrandReal2() * (max - min) + min);
+  }
+
+  /**
+   * Sets the seed to use.
+   *
+   * @param S The seed to use.
+   * @throws If the seed is not a `number`.
+   */
+  seed(S: number): void {
+    if (typeof S !== 'number') {
+      throw new FakerError(
+        `seed(S) must take numeric argument; is ${typeof S}`
+      );
+    }
+
+    this.gen.initGenrand(S);
+  }
+
+  /**
+   * Sets the seed to use.
+   *
+   * @param A The seed to use.
+   * @throws If the seed is not a `number[]`.
+   */
+  seed_array(A: number[]): void {
+    if (typeof A !== 'object') {
+      throw new FakerError(
+        `seed_array(A) must take array of numbers; is ${typeof A}`
+      );
+    }
+
+    this.gen.initByArray(A, A.length);
+  }
+}