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Bring jQuery('#id') and jQuery('body') logic back into core (while leaving 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 2011-01-20 11:58:44 -05:00
parent 0f6c7830ce
commit e4d0168893
1 changed files with 57 additions and 18 deletions
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77
src/core.js
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@ -15,8 +15,9 @@ var jQuery = function( selector, context ) {
// A central reference to the root jQuery(document) // A central reference to the root jQuery(document)
rootjQuery, rootjQuery,
// A simple way to check for HTML strings // A simple way to check for HTML strings or ID strings
quickExpr = /^[^<]*(<[\w\W]+>)[^>]*$/, // (both of which we optimize for)
quickExpr = /^(?:[^<]*(<[\w\W]+>)[^>]*$|#([\w\-]+)$)/,
// Check if a string has a non-whitespace character in it // Check if a string has a non-whitespace character in it
rnotwhite = /\S/, rnotwhite = /\S/,
@ -92,32 +93,70 @@ jQuery.fn = jQuery.prototype = {
return this; 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 // Handle HTML strings
if ( typeof selector === "string" ) { if ( typeof selector === "string" ) {
// Are we dealing with HTML string // Are we dealing with HTML string or an ID?
if ( (match = quickExpr.exec( selector )) ) { match = quickExpr.exec( selector );
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 // Verify a match, and that no context was specified for #id
// just do a createElement and skip the rest if ( match && (match[1] || !context) ) {
ret = rsingleTag.exec( selector );
if ( ret ) { // HANDLE: $(html) -> $(array)
if ( jQuery.isPlainObject( context ) ) { if ( match[1] ) {
selector = [ document.createElement( ret[1] ) ]; context = context instanceof jQuery ? context[0] : context;
jQuery.fn.attr.call( selector, context, true ); 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 ( ret ) {
if ( jQuery.isPlainObject( context ) ) {
selector = [ document.createElement( ret[1] ) ];
jQuery.fn.attr.call( selector, context, true );
} else {
selector = [ doc.createElement( ret[1] ) ];
}
} else { } else {
selector = [ doc.createElement( ret[1] ) ]; ret = jQuery.buildFragment( [ match[1] ], [ doc ] );
selector = (ret.cacheable ? jQuery(ret.fragment).clone()[0] : ret.fragment).childNodes;
} }
} else { return jQuery.merge( this, selector );
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 {
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 );
}
// 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, $(...)) // HANDLE: $(expr, $(...))
} else if ( !context || context.jquery ) { } else if ( !context || context.jquery ) {