@mhysko/s-uuid/dist/esm/Converter.js

Translate standard UUID to Base68 format and back

import { encodings } from './encodings.js';
class Converter {
    from;
    to;
    constructor(from = encodings.HEX, to = encodings.BASE58) {
        this.from = from;
        this.to = to;
    }
    encode(input) {
        return this.#convert(input, this.from, this.to);
    }
    decode(input) {
        return this.#convert(input, this.to, this.from);
    }
    #convert(input, from, to) {
        if (!this.#validate(input, from)) {
            throw new Error(`Input ${input} contains invalid characters. Expected only ${from}`);
        }
        if (from === to) {
            return input;
        }
        const map = new Map();
        let inLength = input.length;
        let outLength;
        let i = 0;
        for (i = 0; i < inLength; i++) {
            map.set(i, from.indexOf(input[i]));
        }
        const toLength = to.length;
        const fromLength = from.length;
        let divide;
        let result = '';
        do {
            divide = 0;
            outLength = 0;
            for (i = 0; i < inLength; i++) {
                divide = divide * fromLength + (map.get(i) ?? 0);
                if (divide >= toLength) {
                    map.set(outLength++, parseInt((divide / toLength).toString(), 10));
                    divide = divide % toLength;
                }
                else if (outLength > 0) {
                    map.set(outLength++, 0);
                }
            }
            inLength = outLength;
            result = to.slice(divide, divide + 1).concat(result);
        } while (outLength !== 0);
        return result;
    }
    #validate(input, from) {
        for (const char of input) {
            if (!from.includes(char)) {
                return false;
            }
        }
        return true;
    }
}
export default Converter;