@dicebear/avatars/lib/utils/prng.js

An avatar library for designers and developers.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.create = void 0;
const MIN = -2147483648;
const MAX = 2147483647;
function xorshift(value) {
    value ^= value << 13;
    value ^= value >> 17;
    value ^= value << 5;
    return value;
}
function hashSeed(seed) {
    let hash = 0;
    for (let i = 0; i < seed.length; i++) {
        hash = ((hash << 5) - hash + seed.charCodeAt(i)) | 0;
        hash = xorshift(hash);
    }
    return hash;
}
function randomSeed() {
    return MIN + Math.floor((MAX - MIN) * Math.random()).toString();
}
function create(seed) {
    seed = seed !== null && seed !== void 0 ? seed : randomSeed();
    let value = hashSeed(seed) || 1;
    const next = () => (value = xorshift(value));
    const integer = (min, max) => {
        return Math.floor(((next() - MIN) / (MAX - MIN)) * (max + 1 - min) + min);
    };
    return {
        seed,
        bool(likelihood = 50) {
            return integer(0, 100) < likelihood;
        },
        integer(min, max) {
            return integer(min, max);
        },
        pick(arr) {
            return arr[integer(0, arr.length - 1)];
        },
    };
}
exports.create = create;