var System = java.lang.System;

var readLineEx = (prompt) => {
    var ret = null;
    while ((ret == null) || $STR(ret).trim() == '') {
        ret = readLine(prompt);
    }
    return ret;
};

var readLine = (prompt) => {
    print(prompt);
    return System.console().readLine();
};

var readYNEx = (prompt) => {
    var ret = null;
    while (ret == null) {
        ret = readYN(prompt);
    }
    return ret;
};

var readYN = (prompt) => {
    print(prompt);
    var read = readLine();
    if ($STR(read).toLowerCase() == 'y') {
        return true;
    }
    if ($STR(read).toLowerCase() == 'n') {
        return false;
    }
    return null;
};

var readListToMark = (prompt, mark) => {
    if (!(mark)) { throw 'Mark cannot be null or empty.'; }
    print(prompt);
    var list = [];
    while (true) {
        var ln = System.console().readLine();
        if ($STR(ln) == $STR(mark)) {
            return list;
        }
        list.push(ln);
    }
};

var readListToCustomMark = (prompt) => {
    var mark = readLineEx(prompt);
    return readListToMark('', mark);
};

if (typeof exports == 'object') {
    exports.readYN = readYN;
    exports.readYNEx = readYNEx;
    exports.readLine = readLine;
    exports.readLineEx = readLineEx;
    exports.readListToMark = readListToMark;
    exports.readListToCustomMark = readListToCustomMark;
}