400 lines
11 KiB
JavaScript
400 lines
11 KiB
JavaScript
define( [
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"./core",
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"./var/isFunction",
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"./var/slice",
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"./callbacks"
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], function( jQuery, isFunction, slice ) {
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"use strict";
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function Identity( v ) {
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return v;
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}
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function Thrower( ex ) {
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throw ex;
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}
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function adoptValue( value, resolve, reject, noValue ) {
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var method;
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try {
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// Check for promise aspect first to privilege synchronous behavior
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if ( value && isFunction( ( method = value.promise ) ) ) {
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method.call( value ).done( resolve ).fail( reject );
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// Other thenables
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} else if ( value && isFunction( ( method = value.then ) ) ) {
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method.call( value, resolve, reject );
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// Other non-thenables
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} else {
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// Control `resolve` arguments by letting Array#slice cast boolean `noValue` to integer:
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// * false: [ value ].slice( 0 ) => resolve( value )
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// * true: [ value ].slice( 1 ) => resolve()
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resolve.apply( undefined, [ value ].slice( noValue ) );
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}
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// For Promises/A+, convert exceptions into rejections
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// Since jQuery.when doesn't unwrap thenables, we can skip the extra checks appearing in
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// Deferred#then to conditionally suppress rejection.
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} catch ( value ) {
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// Support: Android 4.0 only
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// Strict mode functions invoked without .call/.apply get global-object context
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reject.apply( undefined, [ value ] );
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}
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}
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jQuery.extend( {
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Deferred: function( func ) {
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var tuples = [
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// action, add listener, callbacks,
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// ... .then handlers, argument index, [final state]
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[ "notify", "progress", jQuery.Callbacks( "memory" ),
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jQuery.Callbacks( "memory" ), 2 ],
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[ "resolve", "done", jQuery.Callbacks( "once memory" ),
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jQuery.Callbacks( "once memory" ), 0, "resolved" ],
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[ "reject", "fail", jQuery.Callbacks( "once memory" ),
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jQuery.Callbacks( "once memory" ), 1, "rejected" ]
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],
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state = "pending",
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promise = {
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state: function() {
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return state;
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},
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always: function() {
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deferred.done( arguments ).fail( arguments );
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return this;
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},
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"catch": function( fn ) {
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return promise.then( null, fn );
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},
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// Keep pipe for back-compat
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pipe: function( /* fnDone, fnFail, fnProgress */ ) {
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var fns = arguments;
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return jQuery.Deferred( function( newDefer ) {
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jQuery.each( tuples, function( _i, tuple ) {
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// Map tuples (progress, done, fail) to arguments (done, fail, progress)
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var fn = isFunction( fns[ tuple[ 4 ] ] ) && fns[ tuple[ 4 ] ];
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// deferred.progress(function() { bind to newDefer or newDefer.notify })
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// deferred.done(function() { bind to newDefer or newDefer.resolve })
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// deferred.fail(function() { bind to newDefer or newDefer.reject })
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deferred[ tuple[ 1 ] ]( function() {
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var returned = fn && fn.apply( this, arguments );
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if ( returned && isFunction( returned.promise ) ) {
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returned.promise()
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.progress( newDefer.notify )
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.done( newDefer.resolve )
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.fail( newDefer.reject );
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} else {
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newDefer[ tuple[ 0 ] + "With" ](
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this,
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fn ? [ returned ] : arguments
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);
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}
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} );
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} );
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fns = null;
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} ).promise();
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},
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then: function( onFulfilled, onRejected, onProgress ) {
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var maxDepth = 0;
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function resolve( depth, deferred, handler, special ) {
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return function() {
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var that = this,
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args = arguments,
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mightThrow = function() {
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var returned, then;
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// Support: Promises/A+ section 2.3.3.3.3
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// https://promisesaplus.com/#point-59
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// Ignore double-resolution attempts
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if ( depth < maxDepth ) {
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return;
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}
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returned = handler.apply( that, args );
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// Support: Promises/A+ section 2.3.1
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// https://promisesaplus.com/#point-48
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if ( returned === deferred.promise() ) {
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throw new TypeError( "Thenable self-resolution" );
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}
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// Support: Promises/A+ sections 2.3.3.1, 3.5
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// https://promisesaplus.com/#point-54
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// https://promisesaplus.com/#point-75
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// Retrieve `then` only once
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then = returned &&
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// Support: Promises/A+ section 2.3.4
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// https://promisesaplus.com/#point-64
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// Only check objects and functions for thenability
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( typeof returned === "object" ||
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typeof returned === "function" ) &&
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returned.then;
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// Handle a returned thenable
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if ( isFunction( then ) ) {
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// Special processors (notify) just wait for resolution
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if ( special ) {
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then.call(
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returned,
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resolve( maxDepth, deferred, Identity, special ),
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resolve( maxDepth, deferred, Thrower, special )
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);
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// Normal processors (resolve) also hook into progress
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} else {
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// ...and disregard older resolution values
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maxDepth++;
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then.call(
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returned,
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resolve( maxDepth, deferred, Identity, special ),
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resolve( maxDepth, deferred, Thrower, special ),
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resolve( maxDepth, deferred, Identity,
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deferred.notifyWith )
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);
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}
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// Handle all other returned values
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} else {
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// Only substitute handlers pass on context
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// and multiple values (non-spec behavior)
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if ( handler !== Identity ) {
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that = undefined;
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args = [ returned ];
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}
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// Process the value(s)
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// Default process is resolve
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( special || deferred.resolveWith )( that, args );
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}
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},
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// Only normal processors (resolve) catch and reject exceptions
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process = special ?
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mightThrow :
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function() {
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try {
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mightThrow();
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} catch ( e ) {
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if ( jQuery.Deferred.exceptionHook ) {
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jQuery.Deferred.exceptionHook( e,
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process.stackTrace );
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}
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// Support: Promises/A+ section 2.3.3.3.4.1
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// https://promisesaplus.com/#point-61
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// Ignore post-resolution exceptions
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if ( depth + 1 >= maxDepth ) {
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// Only substitute handlers pass on context
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// and multiple values (non-spec behavior)
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if ( handler !== Thrower ) {
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that = undefined;
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args = [ e ];
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}
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deferred.rejectWith( that, args );
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}
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}
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};
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// Support: Promises/A+ section 2.3.3.3.1
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// https://promisesaplus.com/#point-57
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// Re-resolve promises immediately to dodge false rejection from
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// subsequent errors
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if ( depth ) {
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process();
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} else {
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// Call an optional hook to record the stack, in case of exception
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// since it's otherwise lost when execution goes async
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if ( jQuery.Deferred.getStackHook ) {
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process.stackTrace = jQuery.Deferred.getStackHook();
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}
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window.setTimeout( process );
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}
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};
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}
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return jQuery.Deferred( function( newDefer ) {
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// progress_handlers.add( ... )
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tuples[ 0 ][ 3 ].add(
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resolve(
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0,
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newDefer,
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isFunction( onProgress ) ?
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onProgress :
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Identity,
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newDefer.notifyWith
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)
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);
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// fulfilled_handlers.add( ... )
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tuples[ 1 ][ 3 ].add(
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resolve(
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0,
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newDefer,
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isFunction( onFulfilled ) ?
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onFulfilled :
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Identity
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)
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);
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// rejected_handlers.add( ... )
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tuples[ 2 ][ 3 ].add(
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resolve(
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0,
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newDefer,
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isFunction( onRejected ) ?
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onRejected :
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Thrower
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)
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);
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} ).promise();
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},
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// Get a promise for this deferred
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// If obj is provided, the promise aspect is added to the object
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promise: function( obj ) {
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return obj != null ? jQuery.extend( obj, promise ) : promise;
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}
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},
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deferred = {};
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// Add list-specific methods
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jQuery.each( tuples, function( i, tuple ) {
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var list = tuple[ 2 ],
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stateString = tuple[ 5 ];
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// promise.progress = list.add
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// promise.done = list.add
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// promise.fail = list.add
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promise[ tuple[ 1 ] ] = list.add;
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// Handle state
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if ( stateString ) {
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list.add(
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function() {
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// state = "resolved" (i.e., fulfilled)
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// state = "rejected"
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state = stateString;
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},
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// rejected_callbacks.disable
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// fulfilled_callbacks.disable
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tuples[ 3 - i ][ 2 ].disable,
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// rejected_handlers.disable
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// fulfilled_handlers.disable
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tuples[ 3 - i ][ 3 ].disable,
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// progress_callbacks.lock
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tuples[ 0 ][ 2 ].lock,
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// progress_handlers.lock
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tuples[ 0 ][ 3 ].lock
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);
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}
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// progress_handlers.fire
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// fulfilled_handlers.fire
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// rejected_handlers.fire
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list.add( tuple[ 3 ].fire );
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// deferred.notify = function() { deferred.notifyWith(...) }
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// deferred.resolve = function() { deferred.resolveWith(...) }
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// deferred.reject = function() { deferred.rejectWith(...) }
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deferred[ tuple[ 0 ] ] = function() {
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deferred[ tuple[ 0 ] + "With" ]( this === deferred ? undefined : this, arguments );
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return this;
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};
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// deferred.notifyWith = list.fireWith
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// deferred.resolveWith = list.fireWith
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// deferred.rejectWith = list.fireWith
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deferred[ tuple[ 0 ] + "With" ] = list.fireWith;
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} );
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// Make the deferred a promise
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promise.promise( deferred );
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// Call given func if any
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if ( func ) {
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func.call( deferred, deferred );
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}
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// All done!
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return deferred;
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},
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// Deferred helper
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when: function( singleValue ) {
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var
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// count of uncompleted subordinates
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remaining = arguments.length,
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// count of unprocessed arguments
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i = remaining,
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// subordinate fulfillment data
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resolveContexts = Array( i ),
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resolveValues = slice.call( arguments ),
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// the primary Deferred
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primary = jQuery.Deferred(),
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// subordinate callback factory
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updateFunc = function( i ) {
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return function( value ) {
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resolveContexts[ i ] = this;
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resolveValues[ i ] = arguments.length > 1 ? slice.call( arguments ) : value;
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if ( !( --remaining ) ) {
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primary.resolveWith( resolveContexts, resolveValues );
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}
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};
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};
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// Single- and empty arguments are adopted like Promise.resolve
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if ( remaining <= 1 ) {
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adoptValue( singleValue, primary.done( updateFunc( i ) ).resolve, primary.reject,
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!remaining );
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// Use .then() to unwrap secondary thenables (cf. gh-3000)
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if ( primary.state() === "pending" ||
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isFunction( resolveValues[ i ] && resolveValues[ i ].then ) ) {
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return primary.then();
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}
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}
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// Multiple arguments are aggregated like Promise.all array elements
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while ( i-- ) {
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adoptValue( resolveValues[ i ], updateFunc( i ), primary.reject );
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}
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return primary.promise();
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}
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} );
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return jQuery;
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} );
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