Separate jQuery.fn.init into its own module (for lighter core dependencies across all modules). Restore proper support property for effects.

Conflicts:
	src/attributes/classes.js
	src/core.js
	src/manipulation.js
	src/traversing.js

19 files changed, 319 insertions, 287 deletions

diff --git a/src/ajax.js b/src/ajax.js
index 41faad8af..9d9c36b8c 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -3,6 +3,7 @@ define([
 	"./var/rnotwhite",
 	"./ajax/var/nonce",
 	"./ajax/var/rquery",
+	"./core/init",
 	"./ajax/parseJSON",
 	"./ajax/parseXML",
 	"./deferred"
diff --git a/src/attributes/classes.js b/src/attributes/classes.js
index 6ac81392d..64bc747c5 100644
--- a/src/attributes/classes.js
+++ b/src/attributes/classes.js
@@ -1,7 +1,8 @@
 define([
 	"../core",
 	"../var/rnotwhite",
-	"../var/strundefined"
+	"../var/strundefined",
+	"../core/init"
 ], function( jQuery, rnotwhite, strundefined ) {
 
 var rclass = /[\t\r\n\f]/g;
diff --git a/src/attributes/val.js b/src/attributes/val.js
index e25249fb1..1b5e86e1e 100644
--- a/src/attributes/val.js
+++ b/src/attributes/val.js
@@ -1,6 +1,7 @@
 define([
 	"../core",
-	"./support"
+	"./support",
+	"../core/init"
 ], function( jQuery, support ) {
 
 var rreturn = /\r/g;
diff --git a/src/core.js b/src/core.js
index 01b3d9a92..7e190a480 100644
--- a/src/core.js
+++ b/src/core.js
@@ -10,17 +10,8 @@ var
 	toString = require( "./var/toString" ),
 	hasOwn = require( "./var/hasOwn" ),
 	trim = require( "./var/trim" ),
-	rsingleTag = require( "./var/rsingleTag" ),
 	support = require( "./var/support" ),
 
-	i,
-
-	// A central reference to the root jQuery(document)
-	rootjQuery,
-
-	// Use the correct document accordingly with window argument (sandbox)
-	document = window.document,
-
 	// Map over jQuery in case of overwrite
 	_jQuery = window.jQuery,
 
@@ -32,17 +23,13 @@ var
 	// Define a local copy of jQuery
 	jQuery = function( selector, context ) {
 		// The jQuery object is actually just the init constructor 'enhanced'
-		return new jQuery.fn.init( selector, context, rootjQuery );
+		// Need init if jQuery is called (just allow error to be thrown if not included)
+		return new jQuery.fn.init( selector, context );
 	},
 
 	// Make sure we trim BOM and NBSP (here's looking at you, Safari 5.0 and IE)
 	rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,
 
-	// A simple way to check for HTML strings
-	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
-	// Strict HTML recognition (#11290: must start with <)
-	rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]*))$/,
-
 	// Matches dashed string for camelizing
 	rmsPrefix = /^-ms-/,
 	rdashAlpha = /-([\da-z])/gi,
@@ -58,111 +45,6 @@ jQuery.fn = jQuery.prototype = {
 
 	constructor: jQuery,
 
-	init: function( selector, context, rootjQuery ) {
-		var match, elem;
-
-		// HANDLE: $(""), $(null), $(undefined), $(false)
-		if ( !selector ) {
-			return this;
-		}
-
-		// Handle HTML strings
-		if ( typeof selector === "string" ) {
-			if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {
-				// Assume that strings that start and end with <> are HTML and skip the regex check
-				match = [ null, selector, null ];
-
-			} else {
-				match = rquickExpr.exec( selector );
-			}
-
-			// Match html or make sure no context is specified for #id
-			if ( match && (match[1] || !context) ) {
-
-				// HANDLE: $(html) -> $(array)
-				if ( match[1] ) {
-					context = context instanceof jQuery ? context[0] : context;
-
-					// scripts is true for back-compat
-					// Intentionally let the error be thrown if parseHTML is not present
-					jQuery.merge( this, jQuery.parseHTML(
-						match[1],
-						context && context.nodeType ? context.ownerDocument || context : document,
-						true
-					) );
-
-					// HANDLE: $(html, props)
-					if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
-						for ( match in context ) {
-							// Properties of context are called as methods if possible
-							if ( jQuery.isFunction( this[ match ] ) ) {
-								this[ match ]( context[ match ] );
-
-							// ...and otherwise set as attributes
-							} else {
-								this.attr( match, context[ match ] );
-							}
-						}
-					}
-
-					return this;
-
-				// 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, $(...))
-			} else if ( !context || context.jquery ) {
-				return ( context || rootjQuery ).find( selector );
-
-			// HANDLE: $(expr, context)
-			// (which is just equivalent to: $(context).find(expr)
-			} else {
-				return this.constructor( context ).find( selector );
-			}
-
-		// HANDLE: $(DOMElement)
-		} else if ( selector.nodeType ) {
-			this.context = this[0] = selector;
-			this.length = 1;
-			return this;
-
-		// HANDLE: $(function)
-		// Shortcut for document ready
-		} else if ( jQuery.isFunction( selector ) ) {
-			return typeof rootjQuery.ready !== "undefined" ?
-				rootjQuery.ready( selector ) :
-				// Execute immediately if ready is not present
-				selector( jQuery );
-		}
-
-		if ( selector.selector !== undefined ) {
-			this.selector = selector.selector;
-			this.context = selector.context;
-		}
-
-		return jQuery.makeArray( selector, this );
-	},
-
 	// Start with an empty selector
 	selector: "",
 
@@ -242,9 +124,6 @@ jQuery.fn = jQuery.prototype = {
 	splice: deletedIds.splice
 };
 
-// Give the init function the jQuery prototype for later instantiation
-jQuery.fn.init.prototype = jQuery.fn;
-
 jQuery.extend = jQuery.fn.extend = function() {
 	var src, copyIsArray, copy, name, options, clone,
 		target = arguments[0] || {},
@@ -348,6 +227,51 @@ jQuery.extend({
 		return !isNaN( parseFloat(obj) ) && isFinite( obj );
 	},
 
+	isEmptyObject: function( obj ) {
+		var name;
+		for ( name in obj ) {
+			return false;
+		}
+		return true;
+	},
+
+	isPlainObject: function( obj ) {
+		var key;
+
+		// Must be an Object.
+		// Because of IE, we also have to check the presence of the constructor property.
+		// Make sure that DOM nodes and window objects don't pass through, as well
+		if ( !obj || jQuery.type(obj) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
+			return false;
+		}
+
+		try {
+			// Not own constructor property must be Object
+			if ( obj.constructor &&
+				!hasOwn.call(obj, "constructor") &&
+				!hasOwn.call(obj.constructor.prototype, "isPrototypeOf") ) {
+				return false;
+			}
+		} catch ( e ) {
+			// IE8,9 Will throw exceptions on certain host objects #9897
+			return false;
+		}
+
+		// Support: IE<9
+		// Handle iteration over inherited properties before own properties.
+		if ( support.ownLast ) {
+			for ( key in obj ) {
+				return hasOwn.call( obj, key );
+			}
+		}
+
+		// Own properties are enumerated firstly, so to speed up,
+		// if last one is own, then all properties are own.
+		for ( key in obj ) {}
+
+		return key === undefined || hasOwn.call( obj, key );
+	},
+
 	type: function( obj ) {
 		if ( obj == null ) {
 			return String( obj );
@@ -357,14 +281,6 @@ jQuery.extend({
 			typeof obj;
 	},
 
-	isEmptyObject: function( obj ) {
-		var name;
-		for ( name in obj ) {
-			return false;
-		}
-		return true;
-	},
-
 	error: function( msg ) {
 		throw new Error( msg );
 	},
@@ -615,54 +531,6 @@ jQuery.extend({
 	support: support
 });
 
-
-// Support: IE<9
-// Iteration over object's inherited properties before its own.
-// It would be better to move this test to one of test modules but since
-// tests require the jQuery object to exist as well as some other variables set
-// core initialization is needed first for tests used in core itself.
-for ( i in jQuery( support ) ) {
-	break;
-}
-support.ownLast = i !== "0";
-
-jQuery.isPlainObject = function( obj ) {
-	var key;
-
-	// Must be an Object.
-	// Because of IE, we also have to check the presence of the constructor property.
-	// Make sure that DOM nodes and window objects don't pass through, as well
-	if ( !obj || jQuery.type(obj) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
-		return false;
-	}
-
-	try {
-		// Not own constructor property must be Object
-		if ( obj.constructor &&
-			!hasOwn.call(obj, "constructor") &&
-			!hasOwn.call(obj.constructor.prototype, "isPrototypeOf") ) {
-			return false;
-		}
-	} catch ( e ) {
-		// IE8,9 Will throw exceptions on certain host objects #9897
-		return false;
-	}
-
-	// Support: IE<9
-	// Handle iteration over inherited properties before own properties.
-	if ( support.ownLast ) {
-		for ( key in obj ) {
-			return hasOwn.call( obj, key );
-		}
-	}
-
-	// Own properties are enumerated firstly, so to speed up,
-	// if last one is own, then all properties are own.
-	for ( key in obj ) {}
-
-	return key === undefined || hasOwn.call( obj, key );
-};
-
 // Populate the class2type map
 jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
 	class2type[ "[object " + name + "]" ] = name.toLowerCase();
@@ -685,8 +553,5 @@ function isArraylike( obj ) {
 		typeof length === "number" && length > 0 && ( length - 1 ) in obj );
 }
 
-// All jQuery objects should point back to these
-rootjQuery = jQuery( document );
-
 return jQuery;
 });
diff --git a/src/core/init.js b/src/core/init.js
new file mode 100644
index 000000000..f2db547a9
--- /dev/null
+++ b/src/core/init.js
@@ -0,0 +1,132 @@
+// Initialize a jQuery object
+define([
+	"../core",
+	"./var/rsingleTag",
+	"../traversing/findFilter"
+], function( jQuery, rsingleTag ) {
+
+// A central reference to the root jQuery(document)
+var rootjQuery,
+
+	// Use the correct document accordingly with window argument (sandbox)
+	document = window.document,
+
+	// A simple way to check for HTML strings
+	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
+	// Strict HTML recognition (#11290: must start with <)
+	rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]*))$/,
+
+	init = jQuery.fn.init = function( selector, context ) {
+		var match, elem;
+
+		// HANDLE: $(""), $(null), $(undefined), $(false)
+		if ( !selector ) {
+			return this;
+		}
+
+		// Handle HTML strings
+		if ( typeof selector === "string" ) {
+			if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {
+				// Assume that strings that start and end with <> are HTML and skip the regex check
+				match = [ null, selector, null ];
+
+			} else {
+				match = rquickExpr.exec( selector );
+			}
+
+			// Match html or make sure no context is specified for #id
+			if ( match && (match[1] || !context) ) {
+
+				// HANDLE: $(html) -> $(array)
+				if ( match[1] ) {
+					context = context instanceof jQuery ? context[0] : context;
+
+					// scripts is true for back-compat
+					// Intentionally let the error be thrown if parseHTML is not present
+					jQuery.merge( this, jQuery.parseHTML(
+						match[1],
+						context && context.nodeType ? context.ownerDocument || context : document,
+						true
+					) );
+
+					// HANDLE: $(html, props)
+					if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
+						for ( match in context ) {
+							// Properties of context are called as methods if possible
+							if ( jQuery.isFunction( this[ match ] ) ) {
+								this[ match ]( context[ match ] );
+
+							// ...and otherwise set as attributes
+							} else {
+								this.attr( match, context[ match ] );
+							}
+						}
+					}
+
+					return this;
+
+				// 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, $(...))
+			} else if ( !context || context.jquery ) {
+				return ( context || rootjQuery ).find( selector );
+
+			// HANDLE: $(expr, context)
+			// (which is just equivalent to: $(context).find(expr)
+			} else {
+				return this.constructor( context ).find( selector );
+			}
+
+		// HANDLE: $(DOMElement)
+		} else if ( selector.nodeType ) {
+			this.context = this[0] = selector;
+			this.length = 1;
+			return this;
+
+		// HANDLE: $(function)
+		// Shortcut for document ready
+		} else if ( jQuery.isFunction( selector ) ) {
+			return typeof rootjQuery.ready !== "undefined" ?
+				rootjQuery.ready( selector ) :
+				// Execute immediately if ready is not present
+				selector( jQuery );
+		}
+
+		if ( selector.selector !== undefined ) {
+			this.selector = selector.selector;
+			this.context = selector.context;
+		}
+
+		return jQuery.makeArray( selector, this );
+	};
+
+// Give the init function the jQuery prototype for later instantiation
+init.prototype = jQuery.fn;
+
+// Initialize central reference
+rootjQuery = jQuery( document );
+
+return init;
+
+});
diff --git a/src/core/parseHTML.js b/src/core/parseHTML.js
index 15e3e512f..64cf2a18a 100644
--- a/src/core/parseHTML.js
+++ b/src/core/parseHTML.js
@@ -1,6 +1,6 @@
 define([
 	"../core",
-	"../var/rsingleTag",
+	"./var/rsingleTag",
 	"../manipulation" // buildFragment
 ], function( jQuery, rsingleTag ) {
 
diff --git a/src/core/ready.js b/src/core/ready.js
index 8e01c260d..87be24155 100644
--- a/src/core/ready.js
+++ b/src/core/ready.js
@@ -1,5 +1,6 @@
 define([
 	"../core",
+	"../core/init",
 	"../deferred"
 ], function( jQuery ) {
 
diff --git a/src/var/rsingleTag.js b/src/core/var/rsingleTag.js
index 7e7090b77..7e7090b77 100644
--- a/src/var/rsingleTag.js
+++ b/src/core/var/rsingleTag.js
diff --git a/src/css.js b/src/css.js
index b62f67112..a7c9e1c6f 100644
--- a/src/css.js
+++ b/src/css.js
@@ -33,6 +33,7 @@ var
 	cssPrefixes = [ "Webkit", "O", "Moz", "ms" ];
 
 // Dependencies not needed as vars
+require( "./core/init" );
 require( "./css/swap" );
 require( "./core/ready" );
 require( "./selector" ); // contains
diff --git a/src/effects.js b/src/effects.js
index caed88ea7..d5baaca99 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -6,7 +6,7 @@ var
 	cssExpand = require( "./css/var/cssExpand" ),
 	isHidden = require( "./css/var/isHidden" ),
 	defaultDisplay = require( "./css/defaultDisplay" ),
-	support = require( "./css/support" ),
+	support = require( "./effects/support" ),
 
 	fxNow, timerId,
 	rfxtypes = /^(?:toggle|show|hide)$/,
@@ -65,6 +65,7 @@ var
 	};
 
 // Dependencies not needed as vars
+require( "./core/init" );
 require( "./effects/Tween" );
 require( "./queue" );
 require( "./css" );
diff --git a/src/event.js b/src/event.js
index 7523c1db7..12ad019c2 100644
--- a/src/event.js
+++ b/src/event.js
@@ -14,6 +14,7 @@ var
 	rtypenamespace = /^([^.]*)(?:\.(.+)|)$/;
 
 // Dependencies not needed as vars
+require( "./core/init" );
 require( "./data/accepts" );
 require( "./selector" );
 
diff --git a/src/manipulation.js b/src/manipulation.js
index a52040e45..0094b279a 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -2,12 +2,6 @@
 // Keep in mind that a dependency array cannot be used with CommonJS+AMD syntax
 define(function( require ){
 
-// Dependencies not needed as variables
-require( "./data/accepts" );
-require( "./traversing" );
-require( "./selector" );
-require( "./event" );
-
 function createSafeFragment( document ) {
 	var list = nodeNames.split( "|" ),
 		safeFrag = document.createDocumentFragment();
@@ -71,6 +65,12 @@ wrapMap.optgroup = wrapMap.option;
 wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
 wrapMap.th = wrapMap.td;
 
+// Dependencies not needed as variables
+require( "./core/init" );
+require( "./data/accepts" );
+require( "./traversing" );
+require( "./selector" );
+require( "./event" );
 
 function getAll( context, tag ) {
 	var elems, elem,
diff --git a/src/offset.js b/src/offset.js
index ff7c867cb..cfc260da2 100644
--- a/src/offset.js
+++ b/src/offset.js
@@ -2,6 +2,7 @@ define([
 	"./core",
 	"./var/strundefined",
 	"./core/access",
+	"./core/init",
 	"./css",
 	"./selector" // contains
 ], function( jQuery, strundefined, access ) {
diff --git a/src/serialize.js b/src/serialize.js
index 85798ef62..797d735aa 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -1,6 +1,7 @@
 define([
 	"./core",
 	"./manipulation/var/rcheckableType",
+	"./core/init",
 	"./traversing", // filter
 	"./attributes/prop"
 ], function( jQuery, rcheckableType ) {
diff --git a/src/support.js b/src/support.js
index 832f192d5..e039a7a4f 100644
--- a/src/support.js
+++ b/src/support.js
@@ -2,10 +2,19 @@ define([
 	"./core",
 	"./var/strundefined",
 	"./var/support",
+	"./core/init", // Needed for hasOwn support test
 	// This is listed as a dependency for build order, but it's still optional in builds
 	"./core/ready"
 ], function( jQuery, strundefined, support ) {
 
+// Support: IE<9
+// Iteration over object's inherited properties before its own
+var i;
+for ( i in jQuery( support ) ) {
+	break;
+}
+support.ownLast = i !== "0";
+
 // Note: most support tests are defined in their respective modules.
 
 jQuery(function() {
diff --git a/src/traversing.js b/src/traversing.js
index 4f3bba0fc..02ea249fe 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -1,11 +1,12 @@
 define([
 	"./core",
+	"./traversing/var/rneedsContext",
+	"./core/init",
+	"./traversing/findFilter",
 	"./selector"
-], function( jQuery ) {
+], function( jQuery, rneedsContext ) {
 
-var isSimple = /^.[^:#\[\.,]*$/,
-	rparentsprev = /^(?:parents|prev(?:Until|All))/,
-	rneedsContext = jQuery.expr.match.needsContext,
+var rparentsprev = /^(?:parents|prev(?:Until|All))/,
 	// methods guaranteed to produce a unique set when starting from a unique set
 	guaranteedUnique = {
 		children: true,
@@ -14,51 +15,7 @@ var isSimple = /^.[^:#\[\.,]*$/,
 		prev: true
 	};
 
-// Implement the identical functionality for filter and not
-function winnow( elements, qualifier, not ) {
-	if ( jQuery.isFunction( qualifier ) ) {
-		return jQuery.grep( elements, function( elem, i ) {
-			/* jshint -W018 */
-			return !!qualifier.call( elem, i, elem ) !== not;
-		});
-
-	}
-
-	if ( qualifier.nodeType ) {
-		return jQuery.grep( elements, function( elem ) {
-			return ( elem === qualifier ) !== not;
-		});
-
-	}
-
-	if ( typeof qualifier === "string" ) {
-		if ( isSimple.test( qualifier ) ) {
-			return jQuery.filter( qualifier, elements, not );
-		}
-
-		qualifier = jQuery.filter( qualifier, elements );
-	}
-
-	return jQuery.grep( elements, function( elem ) {
-		return ( jQuery.inArray( elem, qualifier ) >= 0 ) !== not;
-	});
-}
-
 jQuery.extend({
-	filter: function( expr, elems, not ) {
-		var elem = elems[ 0 ];
-
-		if ( not ) {
-			expr = ":not(" + expr + ")";
-		}
-
-		return elems.length === 1 && elem.nodeType === 1 ?
-			jQuery.find.matchesSelector( elem, expr ) ? [ elem ] : [] :
-			jQuery.find.matches( expr, jQuery.grep( elems, function( elem ) {
-				return elem.nodeType === 1;
-			}));
-	},
-
 	dir: function( elem, dir, until ) {
 		var matched = [],
 			cur = elem[ dir ];
@@ -86,32 +43,6 @@ jQuery.extend({
 });
 
 jQuery.fn.extend({
-	find: function( selector ) {
-		var i,
-			ret = [],
-			self = this,
-			len = self.length;
-
-		if ( typeof selector !== "string" ) {
-			return this.pushStack( jQuery( selector ).filter(function() {
-				for ( i = 0; i < len; i++ ) {
-					if ( jQuery.contains( self[ i ], this ) ) {
-						return true;
-					}
-				}
-			}) );
-		}
-
-		for ( i = 0; i < len; i++ ) {
-			jQuery.find( selector, self[ i ], ret );
-		}
-
-		// Needed because $( selector, context ) becomes $( context ).find( selector )
-		ret = this.pushStack( len > 1 ? jQuery.unique( ret ) : ret );
-		ret.selector = this.selector ? this.selector + " " + selector : selector;
-		return ret;
-	},
-
 	has: function( target ) {
 		var i,
 			targets = jQuery( target, this ),
@@ -126,27 +57,6 @@ jQuery.fn.extend({
 		});
 	},
 
-	not: function( selector ) {
-		return this.pushStack( winnow(this, selector || [], true) );
-	},
-
-	filter: function( selector ) {
-		return this.pushStack( winnow(this, selector || [], false) );
-	},
-
-	is: function( selector ) {
-		return !!winnow(
-			this,
-
-			// If this is a positional/relative selector, check membership in the returned set
-			// so $("p:first").is("p:last") won't return true for a doc with two "p".
-			typeof selector === "string" && rneedsContext.test( selector ) ?
-				jQuery( selector ) :
-				selector || [],
-			false
-		).length;
-	},
-
 	closest: function( selectors, context ) {
 		var cur,
 			i = 0,
diff --git a/src/traversing/findFilter.js b/src/traversing/findFilter.js
new file mode 100644
index 000000000..e295045a5
--- /dev/null
+++ b/src/traversing/findFilter.js
@@ -0,0 +1,100 @@
+define([
+	"../core",
+	"../var/indexOf",
+	"./var/rneedsContext",
+	"../selector"
+], function( jQuery, indexOf, rneedsContext ) {
+
+var risSimple = /^.[^:#\[\.,]*$/;
+
+// Implement the identical functionality for filter and not
+function winnow( elements, qualifier, not ) {
+	if ( jQuery.isFunction( qualifier ) ) {
+		return jQuery.grep( elements, function( elem, i ) {
+			/* jshint -W018 */
+			return !!qualifier.call( elem, i, elem ) !== not;
+		});
+
+	}
+
+	if ( qualifier.nodeType ) {
+		return jQuery.grep( elements, function( elem ) {
+			return ( elem === qualifier ) !== not;
+		});
+
+	}
+
+	if ( typeof qualifier === "string" ) {
+		if ( risSimple.test( qualifier ) ) {
+			return jQuery.filter( qualifier, elements, not );
+		}
+
+		qualifier = jQuery.filter( qualifier, elements );
+	}
+
+	return jQuery.grep( elements, function( elem ) {
+		return ( jQuery.inArray( elem, qualifier ) >= 0 ) !== not;
+	});
+}
+
+jQuery.filter = function( expr, elems, not ) {
+	var elem = elems[ 0 ];
+
+	if ( not ) {
+		expr = ":not(" + expr + ")";
+	}
+
+	return elems.length === 1 && elem.nodeType === 1 ?
+		jQuery.find.matchesSelector( elem, expr ) ? [ elem ] : [] :
+		jQuery.find.matches( expr, jQuery.grep( elems, function( elem ) {
+			return elem.nodeType === 1;
+		}));
+};
+
+jQuery.fn.extend({
+	find: function( selector ) {
+		var i,
+			ret = [],
+			self = this,
+			len = self.length;
+
+		if ( typeof selector !== "string" ) {
+			return this.pushStack( jQuery( selector ).filter(function() {
+				for ( i = 0; i < len; i++ ) {
+					if ( jQuery.contains( self[ i ], this ) ) {
+						return true;
+					}
+				}
+			}) );
+		}
+
+		for ( i = 0; i < len; i++ ) {
+			jQuery.find( selector, self[ i ], ret );
+		}
+
+		// Needed because $( selector, context ) becomes $( context ).find( selector )
+		ret = this.pushStack( len > 1 ? jQuery.unique( ret ) : ret );
+		ret.selector = this.selector ? this.selector + " " + selector : selector;
+		return ret;
+	},
+	filter: function( selector ) {
+		return this.pushStack( winnow(this, selector || [], false) );
+	},
+	not: function( selector ) {
+		return this.pushStack( winnow(this, selector || [], true) );
+	},
+	is: function( selector ) {
+		return !!winnow(
+			this,
+
+			// If this is a positional/relative selector, check membership in the returned set
+			// so $("p:first").is("p:last") won't return true for a doc with two "p".
+			typeof selector === "string" && rneedsContext.test( selector ) ?
+				jQuery( selector ) :
+				selector || [],
+			false
+		).length;
+	}
+});
+
+});
diff --git a/src/traversing/var/rneedsContext.js b/src/traversing/var/rneedsContext.js
new file mode 100644
index 000000000..3d6ae4038
--- /dev/null
+++ b/src/traversing/var/rneedsContext.js
@@ -0,0 +1,6 @@
+define([
+	"../../core",
+	"../../selector"
+], function( jQuery ) {
+	return jQuery.expr.match.needsContext;
+});
diff --git a/src/wrap.js b/src/wrap.js
index 1ec2771ce..a3c35d9f2 100644
--- a/src/wrap.js
+++ b/src/wrap.js
@@ -1,5 +1,6 @@
 define([
 	"./core",
+	"./core/init",
 	"./traversing" // parent, contents
 ], function( jQuery ) {