/*
Copyright (c) 2010, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.com/yui/license.html
version: 3.2.0
build: nightly
*/
YUI.add('querystring-parse', function(Y) {

/**
 * <p>The QueryString module adds support for serializing JavaScript objects into
 * query strings and parsing JavaScript objects from query strings format.</p>
 *
 * <p>The QueryString namespace is added to your YUI instance including static methods
 * Y.QueryString.parse(..) and Y.QueryString.stringify(..).</p>
 *
 * <p>The <code>querystring</code> module is a rollup of <code>querystring-parse</code> and
 * <code>querystring-stringify</code>.</p>
 * 
 * <p>As their names suggest, <code>querystring-parse</code> adds support for parsing
 * Query String data (Y.QueryString.parse) and <code>querystring-stringify</code> 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.</p>
 *
 * @module querystring
 * @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;
};

/**
 * Provides Y.QueryString.parse method to accept Query Strings and return native
 * JavaScript objects.
 *
 * @module querystring
 * @submodule querystring-parse
 * @for QueryString
 * @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.
 * @module querystring
 * @submodule querystring-parse
 * @for QueryString
 * @static
 **/
QueryString.unescape = function (s) {
    return decodeURIComponent(s.replace(/\+/g, ' '));
};





}, '3.2.0' ,{requires:['collection']});

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

/**
 * Provides Y.QueryString.stringify method for converting objects to Query Strings.
 *
 * @module querystring
 * @submodule querystring-stringify
 * @for QueryString
 * @static
 */

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
 * @module querystring
 * @submodule querystring-stringify
 * @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
 * @param obj {Variant} any arbitrary value to convert to query string
 * @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: "="
 * @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;
};



}, '3.2.0' );



YUI.add('querystring', function(Y){}, '3.2.0' ,{use:['querystring-parse', 'querystring-stringify']});

