Callbacks: Reduce size

(cherry picked from commit 18baae2)

Author: gibson042

src/callbacks.js

@@ -3,12 +3,9 @@ define([
 	"./var/rnotwhite"
 ], function( jQuery, rnotwhite ) {
 
-// String to Object options format cache
-var optionsCache = {};
-
-// Convert String-formatted options into Object-formatted ones and store in cache
+// Convert String-formatted options into Object-formatted ones
 function createOptions( options ) {
-	var object = optionsCache[ options ] = {};
+	var object = {};
 	jQuery.each( options.match( rnotwhite ) || [], function( _, flag ) {
 		object[ flag ] = true;
 	});
@@ -42,132 +39,129 @@ jQuery.Callbacks = function( options ) {
 	// Convert options from String-formatted to Object-formatted if needed
 	// (we check in cache first)
 	options = typeof options === "string" ?
-		( optionsCache[ options ] || createOptions( options ) ) :
+		createOptions( options ) :
 		jQuery.extend( {}, options );
 
 	var // Flag to know if list is currently firing
 		firing,
-		// Last fire value (for non-forgettable lists)
+		// Last fire value for non-forgettable lists
 		memory,
 		// Flag to know if list was already fired
 		fired,
-		// Flag to prevent .fire/.fireWith
+		// Flag to prevent firing
 		locked,
-		// End of the loop when firing
-		firingLength,
-		// Index of currently firing callback (modified by remove if needed)
-		firingIndex,
-		// First callback to fire (used internally by add and fireWith)
-		firingStart,
 		// Actual callback list
 		list = [],
-		// Stack of fire calls for repeatable lists
-		stack = !options.once && [],
+		// Queue of execution data for repeatable lists
+		queue = [],
+		// Index of currently firing callback (modified by add/remove as needed)
+		firingIndex = -1,
 		// Fire callbacks
-		fire = function( data ) {
+		fire = function() {
+
+			// Enforce single-firing
 			locked = options.once;
-			memory = options.memory && data;
-			fired = true;
-			firingIndex = firingStart || 0;
-			firingStart = 0;
-			firingLength = list.length;
-			firing = true;
-			for ( ; list && firingIndex < firingLength; firingIndex++ ) {
-				if ( list[ firingIndex ].apply( data[ 0 ], data[ 1 ] ) === false &&
-					options.stopOnFalse ) {
-
-					memory = false; // To prevent further calls using add
-					break;
+
+			// Execute callbacks for all pending executions,
+			// respecting firingIndex overrides and runtime changes
+			fired = firing = true;
+			for ( ; queue.length; firingIndex = -1 ) {
+				memory = queue.shift();
+				while ( ++firingIndex < list.length ) {
+
+					// Run callback and check for early termination
+					if ( list[ firingIndex ].apply( memory[ 0 ], memory[ 1 ] ) === false &&
+						options.stopOnFalse ) {
+
+						// Jump to end and forget the data so .add doesn't re-fire
+						firingIndex = list.length;
+						memory = false;
+					}
 				}
 			}
-			firing = false;
 
-			// If not disabled,
-			if ( list ) {
+			// Forget the data if we're done with it
+			if ( !options.memory ) {
+				memory = false;
+			}
 
-				// If repeatable, check for pending execution
-				if ( stack ) {
-					if ( stack.length ) {
-						fire( stack.shift() );
-					}
+			firing = false;
+
+			// Clean up if we're done firing for good
+			if ( locked ) {
 
-				// If not repeatable but with memory, clear out spent callbacks
-				} else if ( memory ) {
+				// Keep an empty list if we have data for future add calls
+				if ( memory ) {
 					list = [];
 
-				// Else, disable
+				// Otherwise, this object is spent
 				} else {
-					self.disable();
+					list = "";
 				}
 			}
 		},
+
 		// Actual Callbacks object
 		self = {
+
 			// Add a callback or a collection of callbacks to the list
 			add: function() {
 				if ( list ) {
-					// First, we save the current length
-					var start = list.length;
+
+					// If we have memory from a past run, we should fire after adding
+					if ( memory && !firing ) {
+						firingIndex = list.length - 1;
+						queue.push( memory );
+					}
+
 					(function add( args ) {
 						jQuery.each( args, function( _, arg ) {
-							var type = jQuery.type( arg );
-							if ( type === "function" ) {
+							if ( jQuery.isFunction( arg ) ) {
 								if ( !options.unique || !self.has( arg ) ) {
 									list.push( arg );
 								}
-							} else if ( arg && arg.length && type !== "string" ) {
+							} else if ( arg && arg.length && jQuery.type( arg ) !== "string" ) {
 								// Inspect recursively
 								add( arg );
 							}
 						});
 					})( arguments );
-					// Do we need to add the callbacks to the
-					// current firing batch?
-					if ( firing ) {
-						firingLength = list.length;
-					// With memory, if we're not firing then
-					// we should call right away
-					} else if ( memory ) {
-						firingStart = start;
-						fire( memory );
+
+					if ( memory && !firing ) {
+						fire();
 					}
 				}
 				return this;
 			},
 
 			// Remove a callback from the list
 			remove: function() {
-				if ( list ) {
-					jQuery.each( arguments, function( _, arg ) {
-						var index;
-						while ( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
-							list.splice( index, 1 );
-							// Handle firing indexes
-							if ( firing ) {
-								if ( index <= firingLength ) {
-									firingLength--;
-								}
-								if ( index <= firingIndex ) {
-									firingIndex--;
-								}
-							}
+				jQuery.each( arguments, function( _, arg ) {
+					var index;
+					while ( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
+						list.splice( index, 1 );
+
+						// Handle firing indexes
+						if ( index <= firingIndex ) {
+							firingIndex--;
 						}
-					});
-				}
+					}
+				});
 				return this;
 			},
 
 			// Check if a given callback is in the list.
 			// If no argument is given, return whether or not list has callbacks attached.
 			has: function( fn ) {
-				return fn ? jQuery.inArray( fn, list ) > -1 : !!( list && list.length );
+				return fn ?
+					jQuery.inArray( fn, list ) > -1 :
+					list.length > 0;
 			},
 
 			// Remove all callbacks from the list
 			empty: function() {
 				if ( list ) {
 					list = [];
-					firingLength = 0;
 				}
 				return this;
 			},
@@ -176,8 +170,8 @@ jQuery.Callbacks = function( options ) {
 			// Abort any current/pending executions
 			// Clear all callbacks and values
 			disable: function() {
-				list = stack = memory = undefined;
-				locked = true;
+				locked = queue = [];
+				list = memory = "";
 				return this;
 			},
 			disabled: function() {
@@ -188,10 +182,9 @@ jQuery.Callbacks = function( options ) {
 			// Also disable .add unless we have memory (since it would have no effect)
 			// Abort any pending executions
 			lock: function() {
-				stack = undefined;
-				locked = true;
+				locked = queue = [];
 				if ( !memory && !firing ) {
-					self.disable();
+					list = memory = "";
 				}
 				return this;
 			},
@@ -204,10 +197,9 @@ jQuery.Callbacks = function( options ) {
 				if ( !locked ) {
 					args = args || [];
 					args = [ context, args.slice ? args.slice() : args ];
-					if ( firing ) {
-						stack.push( args );
-					} else {
-						fire( args );
+					queue.push( args );
+					if ( !firing ) {
+						fire();
 					}
 				}
 				return this;