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import Gen from './vendor/mersenne';
/**
* 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`. Required if `max` is set.
*
* @example
* faker.mersenne.rand() // 15515
* faker.mersenne.rand(500, 1000) // 578
*/
rand(max?: number, min?: number): number {
// TODO @Shinigami92 2022-01-11: This is buggy, cause if min is not passed but only max,
// then min will be undefined and this result in NaN for the whole function
if (max === undefined) {
min = 0;
max = 32768;
}
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 Error('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 Error(
'seed_array(A) must take array of numbers; is ' + typeof A
);
}
this.gen.initByArray(A, A.length);
}
}
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