// Declare internals

var internals = {};

exports.escapeJavaScript = function (input) {

if (!input) {
    return '';
}

var escaped = '';

for (var i = 0, il = input.length; i < il; ++i) {

    var charCode = input.charCodeAt(i);

    if (internals.isSafe(charCode)) {
        escaped += input[i];
    }
    else {
        escaped += internals.escapeJavaScriptChar(charCode);
    }
}

return escaped;

};

exports.escapeHtml = function (input) {

if (!input) {
    return '';
}

var escaped = '';

for (var i = 0, il = input.length; i < il; ++i) {

    var charCode = input.charCodeAt(i);

    if (internals.isSafe(charCode)) {
        escaped += input[i];
    }
    else {
        escaped += internals.escapeHtmlChar(charCode);
    }
}

return escaped;

};

internals.escapeJavaScriptChar = function (charCode) {

if (charCode >= 256) {
    return '\\u' + internals.padLeft('' + charCode, 4);
}

var hexValue = new Buffer(String.fromCharCode(charCode), 'ascii').toString('hex');
return '\\x' + internals.padLeft(hexValue, 2);

};

internals.escapeHtmlChar = function (charCode) {

var namedEscape = internals.namedHtml[charCode];
if (typeof namedEscape !== 'undefined') {
    return namedEscape;
}

if (charCode >= 256) {
    return '&#' + charCode + ';';
}

var hexValue = new Buffer(String.fromCharCode(charCode), 'ascii').toString('hex');
return '&#x' + internals.padLeft(hexValue, 2) + ';';

};

internals.padLeft = function (str, len) {

while (str.length < len) {
    str = '0' + str;
}

return str;

};

internals.isSafe = function (charCode) {

return (typeof internals.safeCharCodes[charCode] !== 'undefined');

};

internals.namedHtml = {

'38': '&amp;',
'60': '&lt;',
'62': '&gt;',
'34': '&quot;',
'160': '&nbsp;',
'162': '&cent;',
'163': '&pound;',
'164': '&curren;',
'169': '&copy;',
'174': '&reg;'

};

internals.safeCharCodes = (function () {

var safe = {};

for (var i = 32; i < 123; ++i) {

    if ((i >= 97) ||                    // a-z
        (i >= 65 && i <= 90) ||         // A-Z
        (i >= 48 && i <= 57) ||         // 0-9
        i === 32 ||                     // space
        i === 46 ||                     // .
        i === 44 ||                     // ,
        i === 45 ||                     // -
        i === 58 ||                     // :
        i === 95) {                     // _

        safe[i] = null;
    }
}

return safe;

}());