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Revised internal implementation of ajaxPrefilter() and ajaxTransport(… 
…). Everything is shorter and more efficient now. Also fixes a couple spacing issues that remained.
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@jaubourg
jaubourg committed Jan 23, 2011
1 parent ee22c8b commit 02ca455
Showing 1 changed file with 80 additions and 103 deletions.
183 src/ajax.js
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@@ -38,6 +38,78 @@ var r20 = /%20/g,
*/
transports = {};

// Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
function addToPrefiltersOrTransports( structure ) {

// dataTypeExpression is optional and defaults to "*"
return function( dataTypeExpression, func ) {

if ( typeof dataTypeExpression !== "string" ) {
func = dataTypeExpression;
dataTypeExpression = "*";
}

if ( jQuery.isFunction( func ) ) {
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" ]( func );
}
}
};
}

//Base inspection function for prefilters and transports
function inspectPrefiltersOrTransports( structure, options, originalOptions,
dataType /* internal */, tested /* internal */ ) {

dataType = dataType || options.dataTypes[ 0 ];
tested = tested || {};

tested[ dataType ] = true;

var list = structure[ dataType ],
i = 0,
length = list ? list.length : 0,
executeOnly = structure === prefilters,
selected;

for(; i < length && !( executeOnly ? typeof selected === "string" && !tested[ selected ] : selected ); i++ ) {
selected = list[ i ]( options, originalOptions );
}
// If we got redirected to another dataType
// we try there
if ( typeof selected === "string" && !tested[ selected ] ) {
options.dataTypes.unshift( selected );
selected = inspectPrefiltersOrTransports(
structure, options, originalOptions, selected, tested );

// If we're only executing or nothing was selected
// we try the catchall dataType if not done already
} else if ( ( executeOnly || !selected ) && !tested[ "*" ] ) {
selected = inspectPrefiltersOrTransports(
structure, options, originalOptions, "*" ,tested );
}
// unnecessary when only executing (prefilters)
// but it'll be ignored by the caller in that case
return selected;
}

jQuery.fn.extend({
load: function( url, params, callback ) {
if ( typeof url !== "string" && _load ) {
@@ -242,13 +314,8 @@ jQuery.extend({
}
},

ajaxPrefilter: function( a, b ) {
prefiltersOrTransports( prefilters, a, b );
},

ajaxTransport: function( a, b ) {
return prefiltersOrTransports( transports, a, b );
},
ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
ajaxTransport: addToPrefiltersOrTransports( transports ),

// Main method
ajax: function( url, options ) {
@@ -433,7 +500,7 @@ jQuery.extend({
if ( s.global ) {
globalEventContext.trigger( "ajaxComplete", [ jXHR, s] );
// Handle the global AJAX counter
if ( ! --jQuery.active ) {
if ( !( --jQuery.active ) ) {
jQuery.event.trigger( "ajaxStop" );
}
}
@@ -486,7 +553,7 @@ jQuery.extend({
}

// Apply prefilters
jQuery.ajaxPrefilter( s, options );
inspectPrefiltersOrTransports( prefilters, s, options );

// Uppercase the type
s.type = s.type.toUpperCase();
@@ -554,12 +621,12 @@ jQuery.extend({
} else {

// Install callbacks on deferreds
for ( i in { success:1, error:1, complete:1 } ) {
for ( i in { success: 1, error: 1, complete: 1 } ) {
jXHR[ i ]( s[ i ] );
}

// Get transport
transport = jQuery.ajaxTransport( s, options );
transport = inspectPrefiltersOrTransports( transports, s, options );

// If no transport, we auto-abort
if ( !transport ) {
@@ -682,96 +749,6 @@ jQuery.extend({

});

// 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;
}
}

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 */ ) {

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 auto ("*")
type = ( type === "function" );
if ( type ) {
arg2 = arg1;
arg1 = undefined;
}
// 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 (mediates between content-type and expected dataType)
@@ -883,7 +860,7 @@ function ajaxConvert( s, response ) {
conv = converters[ conversion ] || converters[ "* " + current ];

// If there is no direct converter, search transitively
if ( ! conv ) {
if ( !conv ) {
conv2 = undefined;
for( conv1 in converters ) {
tmp = conv1.split( " " );
@@ -902,7 +879,7 @@ function ajaxConvert( s, response ) {
}
}
// If we found no converter, dispatch an error
if ( ! ( conv || conv2 ) ) {
if ( !( conv || conv2 ) ) {
jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
}
// If found converter is not an equivalence

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