Bring jQuery('#id') and jQuery('body') logic back into core (while leaving it in...

diff --git a/src/core.js b/src/core.js
index f35e33c..6d333c5 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -15,8 +15,9 @@ var jQuery = function( selector, context ) {
        // A central reference to the root jQuery(document)
        rootjQuery,
 
-       // A simple way to check for HTML strings
-       quickExpr = /^[^<]*(<[\w\W]+>)[^>]*$/,
+       // A simple way to check for HTML strings or ID strings
+       // (both of which we optimize for)
+       quickExpr = /^(?:[^<]*(<[\w\W]+>)[^>]*$|#([\w\-]+)$)/,
 
        // Check if a string has a non-whitespace character in it
        rnotwhite = /\S/,
@@ -92,32 +93,70 @@ jQuery.fn = jQuery.prototype = {
                        return this;
                }
 
+               // The body element only exists once, optimize finding it
+               if ( selector === "body" && !context && document.body ) {
+                       this.context = document;
+                       this[0] = document.body;
+                       this.selector = "body";
+                       this.length = 1;
+                       return this;
+               }
+
                // Handle HTML strings
                if ( typeof selector === "string" ) {
-                       // Are we dealing with HTML string
-                       if ( (match = quickExpr.exec( selector )) ) {
-                               context = context instanceof jQuery ? context[0] : context;
-                               doc = (context ? context.ownerDocument || context : document);
+                       // Are we dealing with HTML string or an ID?
+                       match = quickExpr.exec( selector );
+
+                       // Verify a match, and that no context was specified for #id
+                       if ( match && (match[1] || !context) ) {
+
+                               // HANDLE: $(html) -> $(array)
+                               if ( match[1] ) {
+                                       context = context instanceof jQuery ? context[0] : context;
+                                       doc = (context ? context.ownerDocument || context : document);
+
+                                       // If a single string is passed in and it's a single tag
+                                       // just do a createElement and skip the rest
+                                       ret = rsingleTag.exec( selector );
 
-                               // If a single string is passed in and it's a single tag
-                               // just do a createElement and skip the rest
-                               ret = rsingleTag.exec( selector );
+                                       if ( ret ) {
+                                               if ( jQuery.isPlainObject( context ) ) {
+                                                       selector = [ document.createElement( ret[1] ) ];
+                                                       jQuery.fn.attr.call( selector, context, true );
 
-                               if ( ret ) {
-                                       if ( jQuery.isPlainObject( context ) ) {
-                                               selector = [ document.createElement( ret[1] ) ];
-                                               jQuery.fn.attr.call( selector, context, true );
+                                               } else {
+                                                       selector = [ doc.createElement( ret[1] ) ];
+                                               }
 
                                        } else {
-                                               selector = [ doc.createElement( ret[1] ) ];
+                                               ret = jQuery.buildFragment( [ match[1] ], [ doc ] );
+                                               selector = (ret.cacheable ? jQuery(ret.fragment).clone()[0] : ret.fragment).childNodes;
                                        }
 
+                                       return jQuery.merge( this, selector );
+                                       
+                               // HANDLE: $("#id")
                                } else {
-                                       ret = jQuery.buildFragment( [ match[1] ], [ doc ] );
-                                       selector = (ret.cacheable ? jQuery(ret.fragment).clone()[0] : ret.fragment).childNodes;
-                               }
+                                       elem = document.getElementById( match[2] );
+
+                                       // Check parentNode to catch when Blackberry 4.6 returns
+                                       // nodes that are no longer in the document #6963
+                                       if ( elem && elem.parentNode ) {
+                                               // Handle the case where IE and Opera return items
+                                               // by name instead of ID
+                                               if ( elem.id !== match[2] ) {
+                                                       return rootjQuery.find( selector );
+                                               }
 
-                               return jQuery.merge( this, selector );
+                                               // Otherwise, we inject the element directly into the jQuery object
+                                               this.length = 1;
+                                               this[0] = elem;
+                                       }
+
+                                       this.context = document;
+                                       this.selector = selector;
+                                       return this;
+                               }
 
                        // HANDLE: $(expr, $(...))
                        } else if ( !context || context.jquery ) {