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 /**
 * Provides Y.QueryString.stringify method for converting objects to Query Strings.
 *
 * @module querystring
 * @submodule querystring-stringify
 */
 
 var QueryString = Y.namespace("QueryString"),
 stack = [],
 L = Y.Lang;
 
 /**
 * Provides Y.QueryString.escape method to be able to override default encoding
 * 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: encodeURIComponent
 *
 * @method escape
 * @for QueryString
 * @static
 **/
 QueryString.escape = encodeURIComponent;
 
 /**
 * <p>Converts an arbitrary value to a Query String representation.</p>
 *
 * <p>Objects with cyclical references will trigger an exception.</p>
 *
 * @method stringify
 * @for QueryString
 * @public
 * @param obj {Any} any arbitrary value to convert to query string
 * @param cfg {Object} (optional) Configuration object. The three
 * supported configurations are:
 * <ul><li>sep: When defined, the value will be used as the key-value
 * separator. The default value is "&".</li>
 * <li>eq: When defined, the value will be used to join the key to
 * the value. The default value is "=".</li>
 * <li>arrayKey: When set to true, the key of an array will have the
 * '[]' notation appended to the key. The default value is false.
 * </li></ul>
 * @param name {String} (optional) Name of the current key, for handling children recursively.
 * @static
 */
 QueryString.stringify = function (obj, c, name) {
 var begin, end, i, l, n, s,
 sep = c && c.sep ? c.sep : "&",
 eq = c && c.eq ? c.eq : "=",
 aK = c && c.arrayKey ? c.arrayKey : false;
 
 if (L.isNull(obj) || L.isUndefined(obj) || L.isFunction(obj)) {
 return name ? QueryString.escape(name) + eq : '';
 }
 
 if (L.isBoolean(obj) || Object.prototype.toString.call(obj) === '[object Boolean]') {
 obj =+ obj;
 }
 
 if (L.isNumber(obj) || L.isString(obj)) {
 // Y.log("Number or string: "+obj);
 return QueryString.escape(name) + eq + QueryString.escape(obj);
 }
 
 if (L.isArray(obj)) {
 s = [];
 name = aK ? name + '[]' : name;
 l = obj.length;
 for (i = 0; i < l; i++) {
 s.push( QueryString.stringify(obj[i], c, name) );
 }
 
 return s.join(sep);
 }
 // now we know it's an object.
 // Y.log(
 // typeof obj + (typeof obj === 'object' ? " ok" : "ONOES!")+
 // Object.prototype.toString.call(obj)
 // );
 
 // Check for cyclical references in nested objects
 for (i = stack.length - 1; i >= 0; --i) {
 if (stack[i] === obj) {
 throw new Error("QueryString.stringify. Cyclical reference");
 }
 }
 
 stack.push(obj);
 s = [];
 begin = name ? name + '[' : '';
 end = name ? ']' : '';
 for (i in obj) {
 if (obj.hasOwnProperty(i)) {
 n = begin + i + end;
 s.push(QueryString.stringify(obj[i], c, n));
 }
 }
 
 stack.pop();
 s = s.join(sep);
 if (!s && name) {
 return name + "=";
 }
 
 return s;
 };