Encode/Decode Unicode

(function (win, undef) {
    var encodeMap = {
        '\0': '0',
        '\b': 'b',
        '\t': 't',
        '\n': 'n',
        '\v': 'v',
        '\f': 'f',
        '\r': 'r',
        '"': '"',
        "'": "'",
        '\\': '\\'
    };

    var decodeMap = {};

    for (var p in encodeMap) {
        decodeMap[encodeMap[p]] = p;
    }

    win.encodeUnicode = function (s) {
        var re = /[^\x20\x21\x23-\x26\x28-\x5b\x5d-\x7e]/g;
        return s.replace(re, function (c) {
            if (c in encodeMap) {
                return '\\' + encodeMap[c];
            }
            c = c.charCodeAt(0);
            if (c < 128) {
                return '\\x' + (c < 16 ? '0' : '') + c.toString(16);
            }
            return '\\u' + ('000' + c.toString(16)).slice(-4);
        });
    };

    win.decodeUnicode = function (s) {
        var re = /\\((?:[1-7][0-7]{0,2}|[0-7]{2,3}))|\\x([\da-f]{2})|\\u([\da-f]{4})|\\(.)/gi;
        return s.replace(re, function (_, o, h, u, c) {
            // console.log(arguments);
            if (o !== undef) return String.fromCharCode(parseInt(o, 8));
            if (h !== undef) return String.fromCharCode(parseInt(h, 16));
            if (u !== undef) return String.fromCharCode(parseInt(u, 16));
            if ('xXuU'.indexOf(c) != -1) throw new Error('bad sequence');
            if (c in decodeMap) return decodeMap[c];
            return c;
        });
    };

    win.testEncoder = function () {
        assert(decodeUnicode('\\0') === '\0');
        assert(decodeUnicode('\\b') === '\b');
        assert(decodeUnicode('\\t') === '\t');
        assert(decodeUnicode('\\n') === '\n');
        assert(decodeUnicode('\\v') === '\v');
        assert(decodeUnicode('\\f') === '\f');
        assert(decodeUnicode('\\r') === '\r');
        assert(decodeUnicode('\\"') === '"');
        assert(decodeUnicode('\\\'') === '\'');
        assert(decodeUnicode('\\\\') === '\\');
        assert(decodeUnicode('\\xff') === '\xff');
        assert(decodeUnicode('\\100') === '\100');
        assert(decodeUnicode('\\u0100') === '\u0100');
        console.log('ok');
    };
})(window);