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Bring jQuery('#id') and jQuery('body') logic back into core (while le…

…aving it in Sizzle at the same time). Was causing too much of a performance hit to leave it all to Sizzle.
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jeresig committed Jan 20, 2011
1 parent 0f6c783 commit e4d01688932960896419dc52ffd691cc4f9b3029
Showing with 57 additions and 18 deletions.
  1. +57 −18 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 ) {

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