class JumpEncoder {
    constructor() {
        this.charBorder = 128;
    }

    Encode(text) {
        let i = 0;
        let result = "";
        let inBrackets = (shift) => i + shift < text.length && shift < this.charBorder;
        let hasThreeRepeats = (startIndex) => text.slice(startIndex, startIndex + 3) == text[startIndex].repeat(3);

        while (i < text.length) {
            let repeatsCount = 1;

            while (inBrackets(repeatsCount)
                && text[i] == text[i + repeatsCount])
                repeatsCount++;

            if (repeatsCount >= 3) {
                result += String.fromCharCode(repeatsCount - 3 + this.charBorder) + text[i];
                i += repeatsCount;
            }

            else {
                let nonRepeatsCount = repeatsCount;
                while (inBrackets(nonRepeatsCount) && !(hasThreeRepeats(i + nonRepeatsCount)))
                    nonRepeatsCount++;

                result += String.fromCharCode(nonRepeatsCount);
                result += text.slice(i, i + nonRepeatsCount)
                i += nonRepeatsCount;
            }
        }

        return result;
    }

    Decode(text) {
        let i = 0;
        let result = "";
        while (i < text.length) {
            let currentcode = text.charCodeAt(i);
            if (currentcode >= this.charBorder) {
                let repeatsCount = currentcode + 3 - this.charBorder;
                result += text[i + 1].repeat(repeatsCount);
                i += 2;
            }
            else {
                result += text.slice(i + 1, i + currentcode + 1)
                i += text.charCodeAt(i) + 1;
            }
        }
        return result
    }
}