function _ctBaseDigits(value, base) {
        var DIGITS = '0123456789abcdefghijklmnopqrstuvwxyz';
        var s = (value || '').trim().toLowerCase().replace(/^0x/, '').replace(/^0b/, '').replace(/^0o/, '').replace(/[_\s,]/g, '');
        if (!s) return null;
        var negative = false;
        if (s.charAt(0) === '-') { negative = true; s = s.slice(1); }
        if (!s.length) return null;
        var allowed = DIGITS.slice(0, base);
        for (var i = 0; i < s.length; i++) {
            if (allowed.indexOf(s.charAt(i)) < 0) return null;
        }
        return { digits: s, negative: negative };
    }

    function _ctParseInBase(value, base) {
        var parsed = _ctBaseDigits(value, base);
        if (!parsed) return null;
        if (typeof BigInt === 'function') {
            var big = 0n;
            var b = BigInt(base);
            for (var i = 0; i < parsed.digits.length; i++) {
                big = big * b + BigInt(parseInt(parsed.digits.charAt(i), base));
            }
            return { value: big, negative: parsed.negative };
        }
        var num = 0;
        for (var i = 0; i < parsed.digits.length; i++) {
            num = num * base + parseInt(parsed.digits.charAt(i), base);
        }
        return { value: num, negative: parsed.negative };
    }

    function _ctToBase(parsed, base) {
        if (parsed == null) return '';
        if (typeof BigInt === 'function' && typeof parsed.value === 'bigint') {
            if (parsed.value === 0n) return '0';
            var v = parsed.value;
            var b = BigInt(base);
            var DIGITS = '0123456789abcdefghijklmnopqrstuvwxyz';
            var out = '';
            while (v > 0n) {
                out = DIGITS.charAt(Number(v % b)) + out;
                v = v / b;
            }
            return (parsed.negative ? '-' : '') + out;
        }
        if (parsed.value === 0) return '0';
        return (parsed.negative ? '-' : '') + parsed.value.toString(base);
    }

    function convert(input) {
        var fromBaseRaw = parseInt(($('input[name="0"]').val() || '10'), 10);
        if (!isFinite(fromBaseRaw) || fromBaseRaw < 2 || fromBaseRaw > 36) {
            return 'From base must be between 2 and 36.';
        }
        var s = (input || '').trim();
        if (!s) return '';
        var parsed = _ctParseInBase(s, fromBaseRaw);
        if (parsed == null) {
            return 'That is not a valid base-' + fromBaseRaw + ' number.';
        }

        var lines = [];
        var spotlight = [2, 8, 10, 16];
        for (var i = 0; i < spotlight.length; i++) {
            var b = spotlight[i];
            var name = (b === 2 ? 'Binary     ' : b === 8 ? 'Octal      ' : b === 10 ? 'Decimal    ' : 'Hex        ');
            lines.push('Base ' + (b < 10 ? ' ' : '') + b + '  (' + name + '): ' + _ctToBase(parsed, b));
        }
        lines.push('');
        for (var b = 2; b <= 36; b++) {
            if (spotlight.indexOf(b) >= 0) continue;
            lines.push('Base ' + (b < 10 ? ' ' : '') + b + ': ' + _ctToBase(parsed, b));
        }
        return lines.join('\n');
    }

    $(function(){
        $('.extra-input input[name="0"]').on('input change', function(){ $('#box1').trigger('keyup'); });
    });







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}