scratch – Rev 125

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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";
        }
});

});