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YUI.add('querystring-parse', function (Y, NAME) {

/**

 * The QueryString module adds support for serializing JavaScript objects into

 * query strings and parsing JavaScript objects from query strings format.

 *

 * The QueryString namespace is added to your YUI instance including static methods

 * `Y.QueryString.parse(..)` and `Y.QueryString.stringify(..)`.

 *

 * The `querystring` module is a alias for `querystring-parse` and

 * `querystring-stringify`.

 *

 * As their names suggest, `querystring-parse` adds support for parsing

 * Query String data (`Y.QueryString.parse`) and `querystring-stringify` for serializing

 * JavaScript data into Query Strings (`Y.QueryString.stringify`).  You may choose to

 * include either of the submodules individually if you don't need the

 * complementary functionality, or include the rollup for both.

 *

 * @module querystring

 * @main querystring

*/

/**

 * Provides Y.QueryString.parse method to accept Query Strings and return native

 * JavaScript objects.

 *

 * @module querystring

 * @submodule querystring-parse

*/

/**

 * The QueryString module adds support for serializing JavaScript objects into

 * query strings and parsing JavaScript objects from query strings format.

 * @class QueryString

 * @static

 */

var QueryString = Y.namespace("QueryString"),

// Parse a key=val string.

// These can get pretty hairy

// example flow:

// parse(foo[bar][][bla]=baz)

// return parse(foo[bar][][bla],"baz")

// return parse(foo[bar][], {bla : "baz"})

// return parse(foo[bar], [{bla:"baz"}])

// return parse(foo, {bar:[{bla:"baz"}]})

// return {foo:{bar:[{bla:"baz"}]}}

pieceParser = function (eq) {

    return function parsePiece (key, val) {

        var sliced, numVal, head, tail, ret;

        if (arguments.length !== 2) {

            // key=val, called from the map/reduce

            key = key.split(eq);

            return parsePiece(

                QueryString.unescape(key.shift()),

                QueryString.unescape(key.join(eq))

            );

        }

        key = key.replace(/^\s+|\s+$/g, '');

        if (Y.Lang.isString(val)) {

            val = val.replace(/^\s+|\s+$/g, '');

            // convert numerals to numbers

            if (!isNaN(val)) {

                numVal = +val;

                if (val === numVal.toString(10)) {

                    val = numVal;

                }

            }

        }

        sliced = /(.*)\[([^\]]*)\]$/.exec(key);

        if (!sliced) {

            ret = {};

            if (key) {

                ret[key] = val;

            }

            return ret;

        }

        // ["foo[][bar][][baz]", "foo[][bar][]", "baz"]

        tail = sliced[2];

        head = sliced[1];

        // array: key[]=val

        if (!tail) {

            return parsePiece(head, [val]);

        }

        // obj: key[subkey]=val

        ret = {};

        ret[tail] = val;

        return parsePiece(head, ret);

    };

},

// the reducer function that merges each query piece together into one set of params

mergeParams = function(params, addition) {

    return (

        // if it's uncontested, then just return the addition.

        (!params) ? addition

        // if the existing value is an array, then concat it.

        : (Y.Lang.isArray(params)) ? params.concat(addition)

        // if the existing value is not an array, and either are not objects, arrayify it.

        : (!Y.Lang.isObject(params) || !Y.Lang.isObject(addition)) ? [params].concat(addition)

        // else merge them as objects, which is a little more complex

        : mergeObjects(params, addition)

    );

},

// Merge two *objects* together. If this is called, we've already ruled

// out the simple cases, and need to do the for-in business.

mergeObjects = function(params, addition) {

    for (var i in addition) {

        if (i && addition.hasOwnProperty(i)) {

            params[i] = mergeParams(params[i], addition[i]);

        }

    }

    return params;

};

/**

 * Accept Query Strings and return native JavaScript objects.

 *

 * @method parse

 * @param qs {String} Querystring to be parsed into an object.

 * @param sep {String} (optional) Character that should join param k=v pairs together. Default: "&"

 * @param eq  {String} (optional) Character that should join keys to their values. Default: "="

 * @public

 * @static

 */

QueryString.parse = function (qs, sep, eq) {

    // wouldn't Y.Array(qs.split()).map(pieceParser(eq)).reduce(mergeParams) be prettier?

    return Y.Array.reduce(

        Y.Array.map(

            qs.split(sep || "&"),

            pieceParser(eq || "=")

        ),

        {},

        mergeParams

    );

};

/**

 * Provides Y.QueryString.unescape method to be able to override default decoding

 * method.  This is important in cases where non-standard delimiters are used, if

 * the delimiters would not normally be handled properly by the builtin

 * (en|de)codeURIComponent functions.

 * Default: replace "+" with " ", and then decodeURIComponent behavior.

 *

 * @method unescape

 * @param s {String} String to be decoded.

 * @public

 * @static

 **/

QueryString.unescape = function (s) {

    return decodeURIComponent(s.replace(/\+/g, ' '));

};

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