@haelp/teto/dist/engine/utils/rng/index.mjs

A typescript-based controllable TETR.IO client.

export class RNG {
    static MODULUS = 2147483647;
    static MULTIPLIER = 16807;
    static MAX_FLOAT = 2147483646;
    value;
    index = 0;
    constructor(seed){
        this.value = seed % RNG.MODULUS;
        if (this.value <= 0) {
            this.value += RNG.MAX_FLOAT;
        }
        this.next = this.next.bind(this);
        this.nextFloat = this.nextFloat.bind(this);
        this.shuffleArray = this.shuffleArray.bind(this);
        this.updateFromIndex = this.updateFromIndex.bind(this);
        this.clone = this.clone.bind(this);
    }
    next() {
        this.index++;
        return this.value = RNG.MULTIPLIER * this.value % RNG.MODULUS;
    }
    nextFloat() {
        return (this.next() - 1) / RNG.MAX_FLOAT;
    }
    shuffleArray(array) {
        if (array.length === 0) {
            return array;
        }
        for(let i = array.length - 1; i !== 0; i--){
            const r = Math.floor(this.nextFloat() * (i + 1));
            [array[i], array[r]] = [
                array[r],
                array[i]
            ];
        }
        return array;
    }
    get seed() {
        return this.value;
    }
    set seed(value) {
        this.value = value % RNG.MODULUS;
        if (this.value <= 0) {
            this.value += RNG.MAX_FLOAT;
        }
    }
    updateFromIndex(index) {
        while(this.index < index){
            this.next();
        }
    }
    clone() {
        return new RNG(this.value);
    }
}

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