define([

"../core",
"./var/nonce",
"./var/rquery",
"../ajax"

], function( jQuery, nonce, rquery ) {

var oldCallbacks = [],

rjsonp = /(=)\?(?=&|$)|\?\?/;

// Default jsonp settings jQuery.ajaxSetup({

jsonp: "callback",
jsonpCallback: function() {
        var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( nonce++ ) );
        this[ callback ] = true;
        return callback;
}

});

// Detect, normalize options and install callbacks for jsonp requests jQuery.ajaxPrefilter( “json jsonp”, function( s, originalSettings, jqXHR ) {

var callbackName, overwritten, responseContainer,
        jsonProp = s.jsonp !== false && ( rjsonp.test( s.url ) ?
                "url" :
                typeof s.data === "string" && !( s.contentType || "" ).indexOf("application/x-www-form-urlencoded") && rjsonp.test( s.data ) && "data"
        );

// Handle iff the expected data type is "jsonp" or we have a parameter to set
if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) {

        // Get callback name, remembering preexisting value associated with it
        callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ?
                s.jsonpCallback() :
                s.jsonpCallback;

        // Insert callback into url or form data
        if ( jsonProp ) {
                s[ jsonProp ] = s[ jsonProp ].replace( rjsonp, "$1" + callbackName );
        } else if ( s.jsonp !== false ) {
                s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName;
        }

        // Use data converter to retrieve json after script execution
        s.converters["script json"] = function() {
                if ( !responseContainer ) {
                        jQuery.error( callbackName + " was not called" );
                }
                return responseContainer[ 0 ];
        };

        // force json dataType
        s.dataTypes[ 0 ] = "json";

        // Install callback
        overwritten = window[ callbackName ];
        window[ callbackName ] = function() {
                responseContainer = arguments;
        };

        // Clean-up function (fires after converters)
        jqXHR.always(function() {
                // Restore preexisting value
                window[ callbackName ] = overwritten;

                // Save back as free
                if ( s[ callbackName ] ) {
                        // make sure that re-using the options doesn't screw things around
                        s.jsonpCallback = originalSettings.jsonpCallback;

                        // save the callback name for future use
                        oldCallbacks.push( callbackName );
                }

                // Call if it was a function and we have a response
                if ( responseContainer && jQuery.isFunction( overwritten ) ) {
                        overwritten( responseContainer[ 0 ] );
                }

                responseContainer = overwritten = undefined;
        });

        // Delegate to script
        return "script";
}

});

});