]> source.dussan.org Git - jquery.git/commitdiff
Re-organizes ajax.js: prefilters and transports are no longer stored in ajaxSettings...
authorjaubourg <j@ubourg.net>
Sat, 22 Jan 2011 03:45:20 +0000 (04:45 +0100)
committerjaubourg <j@ubourg.net>
Sat, 22 Jan 2011 03:45:20 +0000 (04:45 +0100)
src/ajax.js

index 187236576c439ab4da409eefe7a21e35042ff7aa..74c300525aae4c8ed9f6c9f80a58008d6cdcd335 100644 (file)
@@ -2,6 +2,7 @@
 
 var r20 = /%20/g,
        rbracket = /\[\]$/,
+       rCRLF = /\r?\n/g,
        rhash = /#.*$/,
        rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
        rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
@@ -9,15 +10,31 @@ var r20 = /%20/g,
        rquery = /\?/,
        rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
        rselectTextarea = /^(?:select|textarea)/i,
+       rspacesAjax = /\s+/,
        rts = /([?&])_=[^&]*/,
        rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
-       rCRLF = /\r?\n/g,
 
        // Slice function
        sliceFunc = Array.prototype.slice,
 
        // Keep a copy of the old load method
-       _load = jQuery.fn.load;
+       _load = jQuery.fn.load,
+
+       // Prefilters
+       // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
+       // 2) These are called:
+       //    * BEFORE asking for a transport
+       //    * AFTER param serialization (s.data is a string if s.processData is true)
+       // 3) key is the dataType
+       // 4) the catchall symbol "*" can be used
+       // 5) execution will start with transport dataType and THEN continue down to "*" if needed
+       prefilters = {},
+
+       // Transports bindings
+       // 1) key is the dataType
+       // 2) the catchall symbol "*" can be used
+       // 3) selection will start with transport dataType and THEN go to "*" if needed
+       transports = {};
 
 jQuery.fn.extend({
        load: function( url, params, callback ) {
@@ -204,22 +221,6 @@ jQuery.extend({
                        text: "responseText"
                },
 
-               // Prefilters
-               // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
-               // 2) These are called:
-               //    * BEFORE asking for a transport
-               //    * AFTER param serialization (s.data is a string if s.processData is true)
-               // 3) key is the dataType
-               // 4) the catchall symbol "*" can be used
-               // 5) execution will start with transport dataType and THEN continue down to "*" if needed
-               prefilters: {},
-
-               // Transports bindings
-               // 1) key is the dataType
-               // 2) the catchall symbol "*" can be used
-               // 3) selection will start with transport dataType and THEN go to "*" if needed
-               transports: {},
-
                // List of data converters
                // 1) key format is "source_type destination_type" (a single space in-between)
                // 2) the catchall symbol "*" can be used for source_type
@@ -240,11 +241,11 @@ jQuery.extend({
        },
 
        ajaxPrefilter: function( a , b ) {
-               ajaxPrefilterOrTransport( "prefilters" , a , b );
+               prefiltersOrTransports( prefilters , a , b );
        },
 
        ajaxTransport: function( a , b ) {
-               return ajaxPrefilterOrTransport( "transports" , a , b );
+               return prefiltersOrTransports( transports , a , b );
        },
 
        // Main method
@@ -262,9 +263,6 @@ jQuery.extend({
 
                var // Create the final options object
                        s = jQuery.extend( true , {} , jQuery.ajaxSettings , options ),
-                       // jQuery lists
-                       jQuery_lastModified = jQuery.lastModified,
-                       jQuery_etag = jQuery.etag,
                        // Callbacks contexts
                        // We force the original context if it exists
                        // or take it from jQuery.ajaxSettings otherwise
@@ -314,23 +312,16 @@ jQuery.extend({
 
                                // Builds headers hashtable if needed
                                getResponseHeader: function( key ) {
-
                                        var match;
-
                                        if ( state === 2 ) {
-
                                                if ( !responseHeaders ) {
-
                                                        responseHeaders = {};
-
                                                        while( ( match = rheaders.exec( responseHeadersString ) ) ) {
                                                                responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
                                                        }
                                                }
                                                match = responseHeaders[ key.toLowerCase() ];
-
                                        }
-
                                        return match || null;
                                },
 
@@ -357,109 +348,27 @@ jQuery.extend({
                        // State is "done" now
                        state = 2;
 
+                       // Clear timeout if it exists
+                       if ( timeoutTimer ) {
+                               clearTimeout(timeoutTimer);
+                       }
+
                        // Dereference transport for early garbage collection
                        // (no matter how long the jXHR object will be used)
                        transport = undefined;
 
-                       // Set readyState
-                       jXHR.readyState = status ? 4 : 0;
-
                        // Cache response headers
                        responseHeadersString = headers || "";
 
-                       // Clear timeout if it exists
-                       if ( timeoutTimer ) {
-                               clearTimeout(timeoutTimer);
-                       }
-
-                       var // Reference dataTypes, converters and responseFields
-                               dataTypes = s.dataTypes,
-                               converters = s.converters,
-                               responseFields = s.responseFields,
-                               responseField,
+                       // Set readyState
+                       jXHR.readyState = status ? 4 : 0;
 
-                               // Flag to mark as success
-                               isSuccess,
-                               // Stored success
+                       var isSuccess,
                                success,
-                               // Stored error
-                               error,
-
-                               // To keep track of statusCode based callbacks
-                               oldStatusCode,
-
-                               // Actual response
-                               response;
-
-                       // If we got responses:
-                       // - find the right one
-                       // - update dataTypes accordingly
-                       // - set responseXXX accordingly too
-                       if ( responses ) {
-
-                               var contents = s.contents,
-                                       transportDataType = dataTypes[0],
-                                       ct,
-                                       type,
-                                       finalDataType,
-                                       firstDataType;
-
-                               // Auto (xml, json, script or text determined given headers)
-                               if ( transportDataType === "*" ) {
-
-                                       // Remove all auto types
-                                       while( dataTypes[0] === "*" ) {
-                                               dataTypes.shift();
-                                       }
-                                       transportDataTypes = dataTypes[0];
-
-                                       // Get content type
-                                       ct = jXHR.getResponseHeader( "content-type" );
-
-                                       // Check if it's a known type
-                                       for ( type in contents ) {
-                                               if ( contents[ type ] && contents[ type ].test( ct ) ) {
-                                                       dataTypes.unshift( ( transportDataType = type ) );
-                                                       break;
-                                               }
-                                       }
-                               }
-
-                               // Check to see if we have a response for the expected dataType
-                               if ( transportDataType in responses ) {
-                                       finalDataType = transportDataType;
-                               } else {
-                                       // Try convertible dataTypes
-                                       for ( type in responses ) {
-                                               if ( ! firstDataType ) {
-                                                       firstDataType = type;
-                                               }
-                                               if ( ! transportDataType || converters[ type + " " + transportDataType ] ) {
-                                                       finalDataType = type;
-                                                       break;
-                                               }
-                                       }
-                                       // Or just use first one
-                                       finalDataType = finalDataType || firstDataType;
-                               }
-
-                               // If we found a dataType
-                               // We get the corresponding response
-                               // and add the dataType to the list if needed
-                               if ( finalDataType ) {
-                                       response = responses[ finalDataType ];
-                                       if ( finalDataType !== transportDataType ) {
-                                               dataTypes.unshift( finalDataType );
-                                       }
-                               }
-
-                               // Fill responseXXX fields
-                               for( type in responseFields ) {
-                                       if ( type in responses ) {
-                                               jXHR[ responseFields[ type ] ] = responses[ type ];
-                                       }
-                               }
-                       }
+                               error = ( statusText = statusText || "error" ),
+                               response = responses ? ajaxHandleResponses( s , jXHR , responses ) : undefined,
+                               lastModified,
+                               etag;
 
                        // If successful, handle type chaining
                        if ( status >= 200 && status < 300 || status === 304 ) {
@@ -467,14 +376,11 @@ jQuery.extend({
                                // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
                                if ( s.ifModified ) {
 
-                                       var lastModified = jXHR.getResponseHeader("Last-Modified"),
-                                               etag = jXHR.getResponseHeader("Etag");
-
-                                       if (lastModified) {
-                                               jQuery_lastModified[ s.url ] = lastModified;
+                                       if ( ( lastModified = jXHR.getResponseHeader("Last-Modified") ) ) {
+                                               jQuery.lastModified[ s.url ] = lastModified;
                                        }
-                                       if (etag) {
-                                               jQuery_etag[ s.url ] = etag;
+                                       if ( ( etag = jXHR.getResponseHeader("Etag") ) ) {
+                                               jQuery.etag[ s.url ] = etag;
                                        }
                                }
 
@@ -482,114 +388,21 @@ jQuery.extend({
                                if ( status === 304 ) {
 
                                        statusText = "notmodified";
-                                       isSuccess = 1;
+                                       isSuccess = true;
 
                                // If we have data
                                } else {
 
-                                       statusText = "success";
-
-                                       // Chain data conversions and determine the final value
-                                       // (if an exception is thrown in the process, it'll be notified as an error)
                                        try {
-
-                                               var i,
-                                                       tmp,
-                                                       // Current dataType
-                                                       current,
-                                                       // Previous dataType
-                                                       prev,
-                                                       // Conversion expression
-                                                       conversion,
-                                                       // Conversion function
-                                                       conv,
-                                                       // Conversion functions (when text is used in-between)
-                                                       conv1,
-                                                       conv2;
-
-                                               // For each dataType in the chain
-                                               for( i = 0 ; i < dataTypes.length ; i++ ) {
-
-                                                       current = dataTypes[ i ];
-
-                                                       // If a responseXXX field for this dataType exists
-                                                       // and if it hasn't been set yet
-                                                       responseField = responseFields[ current ];
-                                                       if ( responseField && ! ( responseField in jXHR ) ) {
-                                                               jXHR[ responseField ] = response;
-                                                       }
-
-                                                       // If this is not the first element
-                                                       if ( i ) {
-
-                                                               // Get the dataType to convert from
-                                                               prev = dataTypes[ i - 1 ];
-
-                                                               // If no auto and dataTypes are actually different
-                                                               if ( prev !== "*" && current !== "*" && prev !== current ) {
-
-                                                                       // Get the converter
-                                                                       conversion = prev + " " + current;
-                                                                       conv = converters[ conversion ] || converters[ "* " + current ];
-
-                                                                       // If there is no direct converter, search transitively
-                                                                       if ( ! conv ) {
-                                                                               conv1 = conv2 = undefined;
-
-                                                                               for( conv1 in converters ) {
-                                                                                       tmp = conv1.split( " " );
-                                                                                       if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
-                                                                                               conv2 = converters[ tmp[ 1 ] + " " + current ];
-                                                                                               if ( conv2 ) {
-                                                                                                       conv1 = converters[ conv1 ];
-                                                                                                       if ( conv1 === true ) {
-                                                                                                               conv = conv2;
-                                                                                                       } else if ( conv2 === true ) {
-                                                                                                               conv = conv1;
-                                                                                                       }
-                                                                                                       break;
-                                                                                               }
-                                                                                       }
-                                                                               }
-                                                                       }
-                                                                       // If we found no converter, dispatch an error
-                                                                       if ( ! ( conv || conv1 && conv2 ) ) {
-                                                                               throw conversion;
-                                                                       }
-                                                                       // If found converter is not an equivalence
-                                                                       if ( conv !== true ) {
-                                                                               // Convert with 1 or 2 converters accordingly
-                                                                               response = conv ? conv( response ) : conv2( conv1( response ) );
-                                                                       }
-                                                               }
-                                                       // If it is the first element of the chain
-                                                       // and we have a dataFilter
-                                                       } else if ( s.dataFilter ) {
-                                                               // Apply the dataFilter
-                                                               response = s.dataFilter( response , current );
-                                                               // Get dataTypes again in case the filter changed them
-                                                               dataTypes = s.dataTypes;
-                                                       }
-                                               }
-                                               // End of loop
-
-                                               // We have a real success
-                                               success = response;
-                                               isSuccess = 1;
-
-                                       // If an exception was thrown
+                                               success = ajaxConvert( s , response );
+                                               statusText = "success";
+                                               isSuccess = true;
                                        } catch(e) {
-
                                                // We have a parsererror
                                                statusText = "parsererror";
                                                error = "" + e;
-
                                        }
                                }
-
-                       // if not success, mark it as an error
-                       } else {
-                                       error = statusText = statusText || "error";
                        }
 
                        // Set data for the fake xhr object
@@ -604,9 +417,8 @@ jQuery.extend({
                        }
 
                        // Status-dependent callbacks
-                       oldStatusCode = statusCode;
+                       jXHR.statusCode( statusCode );
                        statusCode = undefined;
-                       jXHR.statusCode( oldStatusCode );
 
                        if ( s.global ) {
                                globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
@@ -635,13 +447,13 @@ jQuery.extend({
                jXHR.statusCode = function( map ) {
                        if ( map ) {
                                var tmp;
-                               if ( statusCode ) {
+                               if ( state < 2 ) {
                                        for( tmp in map ) {
                                                statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
                                        }
                                } else {
                                        tmp = map[ jXHR.status ];
-                                       jXHR.done( tmp ).fail( tmp );
+                                       jXHR.then( tmp , tmp );
                                }
                        }
                        return this;
@@ -652,7 +464,7 @@ jQuery.extend({
                s.url = ( "" + ( url || s.url ) ).replace( rhash , "" );
 
                // Extract dataTypes list
-               s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
+               s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 
                // Determine if a cross-domain request is in order
                if ( ! s.crossDomain ) {
@@ -712,11 +524,11 @@ jQuery.extend({
 
                // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
                if ( s.ifModified ) {
-                       if ( jQuery_lastModified[ s.url ] ) {
-                               requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
+                       if ( jQuery.lastModified[ s.url ] ) {
+                               requestHeaders[ "if-modified-since" ] = jQuery.lastModified[ s.url ];
                        }
-                       if ( jQuery_etag[ s.url ] ) {
-                               requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
+                       if ( jQuery.etag[ s.url ] ) {
+                               requestHeaders[ "if-none-match" ] = jQuery.etag[ s.url ];
                        }
                }
 
@@ -751,9 +563,7 @@ jQuery.extend({
 
                        // If no transport, we auto-abort
                        if ( ! transport ) {
-
                                done( 0 , "notransport" );
-
                        } else {
 
                                // Set state as sending
@@ -771,16 +581,13 @@ jQuery.extend({
                                        }, s.timeout);
                                }
 
-                               // Try to send
                                try {
                                        transport.send(requestHeaders, done);
                                } catch (e) {
                                        // Propagate exception as error if not done
                                        if ( status === 1 ) {
-
                                                done(0, "error", "" + e);
                                                jXHR = false;
-
                                        // Simply rethrow otherwise
                                        } else {
                                                jQuery.error(e);
@@ -879,97 +686,237 @@ jQuery.extend({
 
 });
 
-// Base function for both ajaxPrefilter and ajaxTransport
-function ajaxPrefilterOrTransport( arg0 , arg1 , arg2 ) {
-
-       var type = jQuery.type( arg1 ),
-               structure = jQuery.ajaxSettings[ arg0 ],
-               i,
-               length;
-
-       // We have an options map so we have to inspect the structure
-       if ( type === "object" ) {
+// Base inspection function for prefilters and transports
+function inspectPrefiltersOrTransports( structure , options , originalOptions , dataType , tested ) {
+
+       dataType = dataType || options.dataTypes[0];
+       tested = tested || {};
+
+       if ( ! tested[ dataType ] ) {
+
+               tested[ dataType ] = true;
+
+               var list = structure[ dataType ],
+                       i = 0,
+                       length = list ? list.length : 0,
+                       executeOnly = structure === prefilters,
+                       selected;
+
+               for( ; ( executeOnly || ! selected ) && i < length ; i++ ) {
+                       selected = list[ i ]( options , originalOptions );
+                       // If we got redirected to a different dataType,
+                       // we add it and switch to the corresponding list
+                       if ( typeof( selected ) === "string" && selected !== dataType ) {
+                               options.dataTypes.unshift( selected );
+                               selected = inspectPrefiltersOrTransports(
+                                               structure , options , originalOptions , selected , tested );
+                               // We always break in order not to continue
+                               // to iterate in previous list
+                               break;
+                       }
+               }
+               // If we're only executing or nothing was selected
+               // we try the catchall dataType
+               if ( ! tested[ "*" ] && ( executeOnly || ! selected ) ) {
+                       selected = inspectPrefiltersOrTransports(
+                                       structure , options , originalOptions , "*" , tested );
+               }
+               // This will be ignored by ajaxPrefilter
+               // so it's safe to return no matter what
+               return selected;
+       }
+}
 
-               var options = arg1,
-                       originalOptions = arg2,
-                       // When dealing with prefilters, we execute only
-                       // (no selection so we never stop when a function
-                       // returns a non-falsy, non-string value)
-                       executeOnly = ( arg0 === "prefilters" ),
-                       inspect = function( dataType, tested ) {
-
-                               if ( ! tested[ dataType ] ) {
-
-                                       tested[ dataType ] = true;
-
-                                       var list = structure[ dataType ],
-                                               selected;
-
-                                       for( i = 0, length = list ? list.length : 0 ; ( executeOnly || ! selected ) && i < length ; i++ ) {
-                                               selected = list[ i ]( options , originalOptions );
-                                               // If we got redirected to a different dataType,
-                                               // we add it and switch to the corresponding list
-                                               if ( typeof( selected ) === "string" && selected !== dataType ) {
-                                                       options.dataTypes.unshift( selected );
-                                                       selected = inspect( selected , tested );
-                                                       // We always break in order not to continue
-                                                       // to iterate in previous list
-                                                       break;
-                                               }
-                                       }
-                                       // If we're only executing or nothing was selected
-                                       // we try the catchall dataType
-                                       if ( executeOnly || ! selected ) {
-                                               selected = inspect( "*" , tested );
-                                       }
-                                       // This will be ignored by ajaxPrefilter
-                                       // so it's safe to return no matter what
-                                       return selected;
-                               }
+function addToPrefiltersOrTransports( structure , dataTypeExpression , functor ) {
+
+       var dataTypes = dataTypeExpression.split( rspacesAjax ),
+               i = 0,
+               length = dataTypes.length,
+               dataType,
+               list,
+               placeBefore;
+
+       // For each dataType in the dataTypeExpression
+       for( ; i < length ; i++ ) {
+               dataType = dataTypes[ i ];
+               // We control if we're asked to add before
+               // any existing element
+               placeBefore = /^\+/.test( dataType );
+               if ( placeBefore ) {
+                       dataType = dataType.substr( 1 );
+               }
+               list = structure[ dataType ] = structure[ dataType ] || [];
+               // then we add to the structure accordingly
+               list[ placeBefore ? "unshift" : "push" ]( functor );
+       }
+}
 
-                       };
+// Base function for both ajaxPrefilter and ajaxTransport
+function prefiltersOrTransports( structure , arg1 , arg2 , type /* internal */ ) {
 
-               // Start inspection with current transport dataType
-               return inspect( options.dataTypes[ 0 ] , {} );
+       type = jQuery.type( arg1 );
 
+       if ( type === "object" ) {
+               // We have an options map so we have to inspect the structure
+               return inspectPrefiltersOrTransports( structure , arg1 , arg2 );
        } else {
-
                // We're requested to add to the structure
                // Signature is ( dataTypeExpression , function )
                // with dataTypeExpression being optional and
-               // defaulting to catchAll (*)
-               type = type === "function";
-
+               // defaulting to auto ("*")
+               type = ( type === "function" );
                if ( type ) {
                        arg2 = arg1;
                        arg1 = undefined;
                }
-               arg1 = arg1 || "*";
-
                // We control that the second argument is really a function
                if ( type || jQuery.isFunction( arg2 ) ) {
+                       addToPrefiltersOrTransports( structure , arg1 || "*" , arg2 );
+               }
+       }
+}
+
+// Handles responses to an ajax request:
+// - sets all responseXXX fields accordingly
+// - finds the right dataType (mediating between content-type and expecting dataType)
+// - returns the corresponding response
+function ajaxHandleResponses( s , jXHR , responses ) {
+
+       var contents = s.contents,
+               dataTypes = s.dataTypes,
+               responseFields = s.responseFields,
+               ct,
+               type,
+               finalDataType,
+               firstDataType;
+
+       // Fill responseXXX fields
+       for( type in responseFields ) {
+               if ( type in responses ) {
+                       jXHR[ responseFields[ type ] ] = responses[ type ];
+               }
+       }
+
+       // Remove auto dataType and get content-type in the process
+       while( dataTypes[0] === "*" ) {
+               dataTypes.shift();
+               if ( ct === undefined ) {
+                       ct = jXHR.getResponseHeader( "content-type" );
+               }
+       }
+
+       // Check if we're dealing with a known content-type
+       if ( ct ) {
+               for ( type in contents ) {
+                       if ( contents[ type ] && contents[ type ].test( ct ) ) {
+                               dataTypes.unshift( type );
+                               break;
+                       }
+               }
+       }
+
+       // Check to see if we have a response for the expected dataType
+       if ( dataTypes[0] in responses ) {
+               finalDataType = dataTypes[0];
+       } else {
+               // Try convertible dataTypes
+               for ( type in responses ) {
+                       if ( ! dataTypes[0] || s.converters[ type + " " + dataTypes[0] ] ) {
+                               finalDataType = type;
+                               break;
+                       }
+                       if ( ! firstDataType ) {
+                               firstDataType = type;
+                       }
+               }
+               // Or just use first one
+               finalDataType = finalDataType || firstDataType;
+       }
 
-                       var dataTypes = arg1.split( /\s+/ ),
-                               functor = arg2,
-                               dataType,
-                               list,
-                               placeBefore;
-
-                       // For each dataType in the dataTypeExpression
-                       for( i = 0 , length = dataTypes.length ; i < length ; i++ ) {
-                               dataType = dataTypes[ i ];
-                               // We control if we're asked to add before
-                               // any existing element
-                               placeBefore = /^\+/.test( dataType );
-                               if ( placeBefore ) {
-                                       dataType = dataType.substr( 1 );
+       // If we found a dataType
+       // We add the dataType to the list if needed
+       // and return the corresponding response
+       if ( finalDataType ) {
+               if ( finalDataType !== dataTypes[0] ) {
+                       dataTypes.unshift( finalDataType );
+               }
+               return responses[ finalDataType ];
+       }
+}
+
+// Chain conversions given the request and the original response
+function ajaxConvert( s , response ) {
+
+       // Apply the dataFilter if provided
+       if ( s.dataFilter ) {
+               response = s.dataFilter( response , s.dataType );
+       }
+
+       var dataTypes = s.dataTypes,
+               converters = s.converters,
+               i,
+               length = dataTypes.length,
+               tmp,
+               // Current and previous dataTypes
+               current = dataTypes[0],
+               prev,
+               // Conversion expression
+               conversion,
+               // Conversion function
+               conv,
+               // Conversion functions (when text is used in-between)
+               conv1,
+               conv2;
+
+       // For each dataType in the chain
+       for( i = 1 ; i < length ; i++ ) {
+
+               // Get the dataTypes
+               prev = current;
+               current = dataTypes[ i ];
+
+               // If current is auto dataType, update it to prev
+               if( current === "*" ) {
+                       current = prev;
+               // If no auto and dataTypes are actually different
+               } else if ( prev !== "*" && prev !== current ) {
+
+                       // Get the converter
+                       conversion = prev + " " + current;
+                       conv = converters[ conversion ] || converters[ "* " + current ];
+
+                       // If there is no direct converter, search transitively
+                       if ( ! conv ) {
+                               conv2 = undefined;
+                               for( conv1 in converters ) {
+                                       tmp = conv1.split( " " );
+                                       if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
+                                               conv2 = converters[ tmp[ 1 ] + " " + current ];
+                                               if ( conv2 ) {
+                                                       conv1 = converters[ conv1 ];
+                                                       if ( conv1 === true ) {
+                                                               conv = conv2;
+                                                       } else if ( conv2 === true ) {
+                                                               conv = conv1;
+                                                       }
+                                                       break;
+                                               }
+                                       }
                                }
-                               list = structure[ dataType ] = structure[ dataType ] || [];
-                               // then we add to the structure accordingly
-                               list[ placeBefore ? "unshift" : "push" ]( functor );
+                       }
+                       // If we found no converter, dispatch an error
+                       if ( ! ( conv || conv2 ) ) {
+                               jQuery.error( "No conversion from " + conversion.replace( " " , " to " ) );
+                       }
+                       // If found converter is not an equivalence
+                       if ( conv !== true ) {
+                               // Convert with 1 or 2 converters accordingly
+                               response = conv ? conv( response ) : conv2( conv1( response ) );
                        }
                }
        }
+
+       return response;
 }
 
 })( jQuery );