var queryString = new (function() {
    function parsePartial(name, value, params) {
        var startPos,
            endPos = 0,
            parts = [];

        while (1) {
            startPos = name.indexOf('[', endPos);

            if (0 > startPos)
                break;

            if (!parts.length)
                parts.push( decodeURIComponent( name.substr(0, startPos) ) );

            endPos = name.indexOf(']', ++startPos);

            if (0 > endPos)
                break;

            parts.push( decodeURIComponent( name.slice(startPos, endPos++) ) );
        }

        if (!parts.length)
            parts.push(name);

        var part,
            current = params,
            i = 0,
            len = parts.length;

        while (1) {
            part = parts[i++];

            if (part == '') {
                var numKeys = Object.keys(current).filter(function(a) { return /^\d+$/.test(a); });
                part = numKeys.length ? Math.max.apply(null, numKeys) + 1 : 0;
            }

            if (i == len)
                break;

            if (current[part] === undefined)
                current[part] = {};

            current = current[part];
        }

        current[part] = decodeURIComponent(value);
    }

    this.parse = function(str, sep, eq) {
        eq = eq || '=';
        var parts = str.split(sep || '&'), i = 0, len = parts.length, obj = {};

        while (i < len) {
            var part = parts[i++].split(eq);
            parsePartial(part[0], part[1], obj);
        }

        return obj;
    }

    function composePartial(obj, params, parts) {
        for (var i in obj) {
            if (typeof obj[i] == 'object') {
                parts.push(i);
                composePartial(obj[i], params, parts);
                parts.pop();
                continue;
            }

            var temp = parts.concat(i).map(encodeURIComponent);
            params.push( [ temp[0] + ( temp.length > 1 ? '[' + temp.slice(1).join('][') + ']' : '' ), encodeURIComponent(obj[i]) ] );
        }
    }

    this.stringify = function(obj, sep, eq) {
        sep = sep || '&';
        eq = eq || '=';
        var params = [];
        composePartial(obj, params, []);
        var i = 0, len = params.length, out = '';

        while (1) {
            out += params[i][0] + eq + params[i][1];

            if (++i == len)
                break;

            out += sep;
        }

        return out;
    }
})();