X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fcore.js;h=56fd0983e33862cda330974947832bde770bcf3d;hb=58235cc38ea835cde0ae90dd2919b86e47f3dd05;hp=a9e7536955d6f2c66a7e4115f8c93fb5fad2c536;hpb=cb3f842c8889458d96511b0103ebbff5cbac217d;p=jquery.git

diff --git a/src/core.js b/src/core.js
index a9e7536..56fd098 100644
--- a/src/core.js
+++ b/src/core.js
@@ -10,7 +10,9 @@ var
 
 	jQuery = window.jQuery = window.$ = function( selector, context ) {
 		// The jQuery object is actually just the init constructor 'enhanced'
-		return new jQuery.fn.init( selector, context );
+		return selector === undefined ?
+			rootjQuery :
+			new jQuery.fn.init( selector, context );
 	},
 
 	// A simple way to check for HTML strings or ID strings
@@ -21,8 +23,11 @@ var
 
 jQuery.fn = jQuery.prototype = {
 	init: function( selector, context ) {
-		// Make sure that a selection was provided
-		selector = selector || document;
+		// Handle $("") or $(null)
+		if ( !selector ) {
+			this.length = 0;
+			return this;
+		}
 
 		// Handle $(DOMElement)
 		if ( selector.nodeType ) {
@@ -31,6 +36,7 @@ jQuery.fn = jQuery.prototype = {
 			this.context = selector;
 			return this;
 		}
+
 		// Handle HTML strings
 		if ( typeof selector === "string" ) {
 			// Are we dealing with HTML string or an ID?
@@ -40,34 +46,41 @@ jQuery.fn = jQuery.prototype = {
 			if ( match && (match[1] || !context) ) {
 
 				// HANDLE: $(html) -> $(array)
-				if ( match[1] )
+				if ( match[1] ) {
 					selector = jQuery.clean( [ match[1] ], context );
 
 				// HANDLE: $("#id")
-				else {
+				} else {
 					var elem = document.getElementById( match[3] );
 
 					// Handle the case where IE and Opera return items
 					// by name instead of ID
-					if ( elem && elem.id != match[3] )
-						return jQuery().find( selector );
+					if ( elem && elem.id != match[3] ) {
+						return rootjQuery.find( selector );
+					}
 
 					// Otherwise, we inject the element directly into the jQuery object
-					var ret = jQuery( elem || [] );
+					var ret = jQuery( elem || null );
 					ret.context = document;
 					ret.selector = selector;
 					return ret;
 				}
 
-			// HANDLE: $(expr, [context])
+			// HANDLE: $(expr, $(...))
+			} else if ( !context || context.jquery ) {
+				return (context || rootjQuery).find( selector );
+
+			// HANDLE: $(expr, context)
 			// (which is just equivalent to: $(content).find(expr)
-			} else
+			} else {
 				return jQuery( context ).find( selector );
+			}
 
 		// HANDLE: $(function)
 		// Shortcut for document ready
-		} else if ( jQuery.isFunction( selector ) )
-			return jQuery( document ).ready( selector );
+		} else if ( jQuery.isFunction( selector ) ) {
+			return rootjQuery.ready( selector );
+		}
 
 		// Make sure that old selector state is passed along
 		if ( selector.selector && selector.context ) {
@@ -107,7 +120,7 @@ jQuery.fn = jQuery.prototype = {
 	// (returning the new matched element set)
 	pushStack: function( elems, name, selector ) {
 		// Build a new jQuery matched element set
-		var ret = jQuery( elems );
+		var ret = jQuery( elems || null );
 
 		// Add the old object onto the stack (as a reference)
 		ret.prevObject = this;
@@ -263,26 +276,31 @@ jQuery.fn = jQuery.prototype = {
 	},
 
 	end: function() {
-		return this.prevObject || jQuery( [] );
+		return this.prevObject || jQuery(null);
 	},
 
-	// For internal use only.
-	// Behaves like an Array's method, not like a jQuery method.
-	push: [].push,
-	sort: [].sort,
-	splice: [].splice,
-
 	find: function( selector ) {
-		if ( this.length === 1 ) {
-			var ret = this.pushStack( [], "find", selector );
-			ret.length = 0;
-			jQuery.find( selector, this[0], ret );
-			return ret;
-		} else {
-			return this.pushStack( jQuery.unique(jQuery.map(this, function(elem){
-				return jQuery.find( selector, elem );
-			})), "find", selector );
+		var ret = this.pushStack( "", "find", selector ), length = 0,
+			splice = Array.prototype.splice;
+
+		for ( var i = 0, l = this.length; i < l; i++ ) {
+			length = ret.length;
+			jQuery.find( selector, this[i], ret );
+
+			if ( i > 0 ) {
+				// Make sure that the results are unique
+				for ( var n = length; n < ret.length; n++ ) {
+					for ( var r = 0; r < length; r++ ) {
+						if ( ret[r] === ret[n] ) {
+							splice.call(ret, n--, 1);
+							break;
+						}
+					}
+				}
+			}
 		}
+
+		return ret;
 	},
 
 	clone: function( events ) {
@@ -1146,6 +1164,9 @@ jQuery.extend({
 	}
 });
 
+// All jQuery objects should point back to these
+var rootjQuery = jQuery(document);
+
 // Use of jQuery.browser is deprecated.
 // It's included for backwards compatibility and plugins,
 // although they should work to migrate away.