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YUI.add('cookie', function (Y, NAME) {

/**
 * Utilities for cookie management
 * @module cookie
 */

//shortcuts
    var L       = Y.Lang,
        O       = Y.Object,
        NULL    = null,

//shortcuts to functions
        isString    = L.isString,
        isObject    = L.isObject,
        isUndefined = L.isUndefined,
        isFunction  = L.isFunction,
        encode      = encodeURIComponent,
        decode      = decodeURIComponent,

//shortcut to document
        doc         = Y.config.doc;

/*
     * Throws an error message.
     */
    function error(message){
        throw new TypeError(message);
    }

/*
     * Checks the validity of a cookie name.
     */
    function validateCookieName(name){
        if (!isString(name) || name === ""){
            error("Cookie name must be a non-empty string.");
        }
    }

/*
     * Checks the validity of a subcookie name.
     */
    function validateSubcookieName(subName){
        if (!isString(subName) || subName === ""){
            error("Subcookie name must be a non-empty string.");
        }
    }

/**
     * Cookie utility.
     * @class Cookie
     * @static
     */
    Y.Cookie = {

//-------------------------------------------------------------------------
        // Private Methods
        //-------------------------------------------------------------------------

/**
         * Creates a cookie string that can be assigned into document.cookie.
         * @param {String} name The name of the cookie.
         * @param {String} value The value of the cookie.
         * @param {Boolean} encodeValue True to encode the value, false to leave as-is.
         * @param {Object} options (Optional) Options for the cookie.
         * @return {String} The formatted cookie string.
         * @method _createCookieString
         * @private
         * @static
         */
        _createCookieString : function (name /*:String*/, value /*:Variant*/, encodeValue /*:Boolean*/, options /*:Object*/) /*:String*/ {

options = options || {};

var text /*:String*/ = encode(name) + "=" + (encodeValue ? encode(value) : value),
                expires = options.expires,
                path    = options.path,
                domain  = options.domain;

if (isObject(options)){
                //expiration date
                if (expires instanceof Date){
                    text += "; expires=" + expires.toUTCString();
                }

//path
                if (isString(path) && path !== ""){
                    text += "; path=" + path;
                }

//domain
                if (isString(domain) && domain !== ""){
                    text += "; domain=" + domain;
                }

//secure
                if (options.secure === true){
                    text += "; secure";
                }
            }

return text;
        },

/**
         * Formats a cookie value for an object containing multiple values.
         * @param {Object} hash An object of key-value pairs to create a string for.
         * @return {String} A string suitable for use as a cookie value.
         * @method _createCookieHashString
         * @private
         * @static
         */
        _createCookieHashString : function (hash /*:Object*/) /*:String*/ {
            if (!isObject(hash)){
                error("Cookie._createCookieHashString(): Argument must be an object.");
            }

var text /*:Array*/ = [];

O.each(hash, function(value, key){
                if (!isFunction(value) && !isUndefined(value)){
                    text.push(encode(key) + "=" + encode(String(value)));
                }
            });

return text.join("&");
        },

/**
         * Parses a cookie hash string into an object.
         * @param {String} text The cookie hash string to parse (format: n1=v1&n2=v2).
         * @return {Object} An object containing entries for each cookie value.
         * @method _parseCookieHash
         * @private
         * @static
         */
        _parseCookieHash : function (text) {

var hashParts   = text.split("&"),
                hashPart    = NULL,
                hash        = {};

if (text.length){
                for (var i=0, len=hashParts.length; i < len; i++){
                    hashPart = hashParts[i].split("=");
                    hash[decode(hashPart[0])] = decode(hashPart[1]);
                }
            }

return hash;
        },

/**
         * Parses a cookie string into an object representing all accessible cookies.
         * @param {String} text The cookie string to parse.
         * @param {Boolean} shouldDecode (Optional) Indicates if the cookie values should be decoded or not. Default is true.
         * @param {Object} options (Optional) Contains settings for loading the cookie.
         * @return {Object} An object containing entries for each accessible cookie.
         * @method _parseCookieString
         * @private
         * @static
         */
        _parseCookieString : function (text /*:String*/, shouldDecode /*:Boolean*/, options /*:Object*/) /*:Object*/ {

var cookies /*:Object*/ = {};

if (isString(text) && text.length > 0) {

var decodeValue = (shouldDecode === false ? function(s){return s;} : decode),
                    cookieParts = text.split(/;\s/g),
                    cookieName  = NULL,
                    cookieValue = NULL,
                    cookieNameValue = NULL;

for (var i=0, len=cookieParts.length; i < len; i++){
                    //check for normally-formatted cookie (name-value)
                    cookieNameValue = cookieParts[i].match(/([^=]+)=/i);
                    if (cookieNameValue instanceof Array){
                        try {
                            cookieName = decode(cookieNameValue[1]);
                            cookieValue = decodeValue(cookieParts[i].substring(cookieNameValue[1].length+1));
                        } catch (ex){
                            //intentionally ignore the cookie - the encoding is wrong
                        }
                    } else {
                        //means the cookie does not have an "=", so treat it as a boolean flag
                        cookieName = decode(cookieParts[i]);
                        cookieValue = "";
                    }
                    // don't overwrite an already loaded cookie if set by option
                    if (!isUndefined(options) && options.reverseCookieLoading) {
                        if (isUndefined(cookies[cookieName])) {
                            cookies[cookieName] = cookieValue;
                        }
                    } else {
                        cookies[cookieName] = cookieValue;
                    }
                }

}

return cookies;
        },

/**
         * Sets the document object that the cookie utility uses for setting
         * cookies. This method is necessary to ensure that the cookie utility
         * unit tests can pass even when run on a domain instead of locally.
         * This method should not be used otherwise; you should use
         * <code>Y.config.doc</code> to change the document that the cookie
         * utility uses for everyday purposes.
         * @param {Object} newDoc The object to use as the document.
         * @method _setDoc
         * @private
         */
        _setDoc: function(newDoc){
            doc = newDoc;
        },

//-------------------------------------------------------------------------
        // Public Methods
        //-------------------------------------------------------------------------

/**
         * Determines if the cookie with the given name exists. This is useful for
         * Boolean cookies (those that do not follow the name=value convention).
         * @param {String} name The name of the cookie to check.
         * @return {Boolean} True if the cookie exists, false if not.
         * @method exists
         * @static
         */
        exists: function(name) {

validateCookieName(name);   //throws error

var cookies = this._parseCookieString(doc.cookie, true);

return cookies.hasOwnProperty(name);
        },

/**
         * Returns the cookie value for the given name.
         * @param {String} name The name of the cookie to retrieve.
         * @param {Function|Object} options (Optional) An object containing one or more
         *      cookie options: raw (true/false), reverseCookieLoading (true/false)
         *      and converter (a function).
         *      The converter function is run on the value before returning it. The
         *      function is not used if the cookie doesn't exist. The function can be
         *      passed instead of the options object for backwards compatibility. When
         *      raw is set to true, the cookie value is not URI decoded.
         * @return {Any} If no converter is specified, returns a string or null if
         *      the cookie doesn't exist. If the converter is specified, returns the value
         *      returned from the converter or null if the cookie doesn't exist.
         * @method get
         * @static
         */
        get : function (name, options) {

validateCookieName(name);   //throws error

var cookies,
                cookie,
                converter;

//if options is a function, then it's the converter
            if (isFunction(options)) {
                converter = options;
                options = {};
            } else if (isObject(options)) {
                converter = options.converter;
            } else {
                options = {};
            }

cookies = this._parseCookieString(doc.cookie, !options.raw, options);
            cookie = cookies[name];

//should return null, not undefined if the cookie doesn't exist
            if (isUndefined(cookie)) {
                return NULL;
            }

if (!isFunction(converter)){
                return cookie;
            } else {
                return converter(cookie);
            }
        },

/**
         * Returns the value of a subcookie.
         * @param {String} name The name of the cookie to retrieve.
         * @param {String} subName The name of the subcookie to retrieve.
         * @param {Function} converter (Optional) A function to run on the value before returning
         *      it. The function is not used if the cookie doesn't exist.
         * @param {Object} options (Optional) Containing one or more settings for cookie parsing.
         * @return {Any} If the cookie doesn't exist, null is returned. If the subcookie
         *      doesn't exist, null if also returned. If no converter is specified and the
         *      subcookie exists, a string is returned. If a converter is specified and the
         *      subcookie exists, the value returned from the converter is returned.
         * @method getSub
         * @static
         */
        getSub : function (name /*:String*/, subName /*:String*/, converter /*:Function*/, options /*:Object*/) /*:Variant*/ {

var hash /*:Variant*/ = this.getSubs(name, options);

if (hash !== NULL) {

validateSubcookieName(subName);   //throws error

if (isUndefined(hash[subName])){
                    return NULL;
                }

if (!isFunction(converter)){
                    return hash[subName];
                } else {
                    return converter(hash[subName]);
                }
            } else {
                return NULL;
            }

/**
         * Returns an object containing name-value pairs stored in the cookie with the given name.
         * @param {String} name The name of the cookie to retrieve.
         * @param {Object} options (Optional) Containing one or more settings for cookie parsing.
         * @return {Object} An object of name-value pairs if the cookie with the given name
         *      exists, null if it does not.
         * @method getSubs
         * @static
         */
        getSubs : function (name /*:String*/, options /*:Object*/) {

validateCookieName(name);   //throws error

var cookies = this._parseCookieString(doc.cookie, false, options);
            if (isString(cookies[name])){
                return this._parseCookieHash(cookies[name]);
            }
            return NULL;
        },

/**
         * Removes a cookie from the machine by setting its expiration date to
         * sometime in the past.
         * @param {String} name The name of the cookie to remove.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string),
         *      and secure (true/false). The expires option will be overwritten
         *      by the method.
         * @return {String} The created cookie string.
         * @method remove
         * @static
         */
        remove : function (name, options) {

validateCookieName(name);   //throws error

//set options
            options = Y.merge(options || {}, {
                expires: new Date(0)
            });

//set cookie
            return this.set(name, "", options);
        },

/**
         * Removes a sub cookie with a given name.
         * @param {String} name The name of the cookie in which the subcookie exists.
         * @param {String} subName The name of the subcookie to remove.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      removeIfEmpty (true/false), and secure (true/false). This must be the same
         *      settings as the original subcookie.
         * @return {String} The created cookie string.
         * @method removeSub
         * @static
         */
        removeSub : function(name, subName, options) {

validateCookieName(name);   //throws error

validateSubcookieName(subName);   //throws error

options = options || {};

//get all subcookies for this cookie
            var subs = this.getSubs(name);

//delete the indicated subcookie
            if (isObject(subs) && subs.hasOwnProperty(subName)){
                delete subs[subName];

if (!options.removeIfEmpty) {
                    //reset the cookie

return this.setSubs(name, subs, options);
                } else {
                    //reset the cookie if there are subcookies left, else remove
                    for (var key in subs){
                        if (subs.hasOwnProperty(key) && !isFunction(subs[key]) && !isUndefined(subs[key])){
                            return this.setSubs(name, subs, options);
                        }
                    }

return this.remove(name, options);
                }
            } else {
                return "";
            }

/**
         * Sets a cookie with a given name and value.
         * @param {String} name The name of the cookie to set.
         * @param {Any} value The value to set for the cookie.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      secure (true/false), and raw (true/false). Setting raw to true indicates
         *      that the cookie should not be URI encoded before being set.
         * @return {String} The created cookie string.
         * @method set
         * @static
         */
        set : function (name, value, options) {

validateCookieName(name);   //throws error

if (isUndefined(value)){
                error("Cookie.set(): Value cannot be undefined.");
            }

options = options || {};

var text = this._createCookieString(name, value, !options.raw, options);
            doc.cookie = text;
            return text;
        },

/**
         * Sets a sub cookie with a given name to a particular value.
         * @param {String} name The name of the cookie to set.
         * @param {String} subName The name of the subcookie to set.
         * @param {Any} value The value to set.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      and secure (true/false).
         * @return {String} The created cookie string.
         * @method setSub
         * @static
         */
        setSub : function (name, subName, value, options) {

validateCookieName(name);   //throws error

validateSubcookieName(subName);   //throws error

if (isUndefined(value)){
                error("Cookie.setSub(): Subcookie value cannot be undefined.");
            }

var hash = this.getSubs(name);

if (!isObject(hash)){
                hash = {};
            }

hash[subName] = value;

return this.setSubs(name, hash, options);

/**
         * Sets a cookie with a given name to contain a hash of name-value pairs.
         * @param {String} name The name of the cookie to set.
         * @param {Object} value An object containing name-value pairs.
         * @param {Object} options (Optional) An object containing one or more
         *      cookie options: path (a string), domain (a string), expires (a Date object),
         *      and secure (true/false).
         * @return {String} The created cookie string.
         * @method setSubs
         * @static
         */
        setSubs : function (name, value, options) {

validateCookieName(name);   //throws error

if (!isObject(value)){
                error("Cookie.setSubs(): Cookie value must be an object.");
            }

var text /*:String*/ = this._createCookieString(name, this._createCookieHashString(value), false, options);
            doc.cookie = text;
            return text;
        }

};

}, '3.18.1', {"requires": ["yui-base"]});

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