Selector: Use the nodeName util where possible to save size

Saves 33 bytes.

Ref jquerygh-4504

Author: mgol

src/selector.js

@@ -1,5 +1,6 @@
 define( [
 	"./core",
+	"./core/nodeName",
 	"./var/document",
 	"./var/indexOf",
 	"./var/hasOwn",
@@ -11,7 +12,7 @@ define( [
 	// The following utils are attached directly to the jQuery object.
 	"./selector/contains",
 	"./selector/escapeSelector"
-], function( jQuery, document, indexOf, hasOwn, pop, push, sort, support ) {
+], function( jQuery, nodeName, document, indexOf, hasOwn, pop, push, sort, support ) {
 
 "use strict";
 
@@ -156,7 +157,7 @@ var i,
 
 	inDisabledFieldset = addCombinator(
 		function( elem ) {
-			return elem.disabled === true && elem.nodeName.toLowerCase() === "fieldset";
+			return elem.disabled === true && nodeName( elem, "fieldset" );
 		},
 		{ dir: "parentNode", next: "legend" }
 	);
@@ -354,8 +355,7 @@ function assert( fn ) {
  */
 function createInputPseudo( type ) {
 	return function( elem ) {
-		var name = elem.nodeName.toLowerCase();
-		return name === "input" && elem.type === type;
+		return nodeName( elem, "input" ) && elem.type === type;
 	};
 }
 
@@ -365,8 +365,8 @@ function createInputPseudo( type ) {
  */
 function createButtonPseudo( type ) {
 	return function( elem ) {
-		var name = elem.nodeName.toLowerCase();
-		return ( name === "input" || name === "button" ) && elem.type === type;
+		return ( nodeName( elem, "input" ) || nodeName( elem, "button" ) ) &&
+			elem.type === type;
 	};
 }
 
@@ -882,13 +882,13 @@ Expr = jQuery.expr = {
 	filter: {
 
 		TAG: function( nodeNameSelector ) {
-			var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
+			var expectedNodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
 			return nodeNameSelector === "*" ?
 				function() {
  return true;
 } :
 				function( elem ) {
-					return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
+					return nodeName( elem, expectedNodeName );
 				};
 		},
 
@@ -976,7 +976,7 @@ Expr = jQuery.expr = {
 								node = elem;
 								while ( ( node = node[ dir ] ) ) {
 									if ( ofType ?
-										node.nodeName.toLowerCase() === name :
+										nodeName( node, name ) :
 										node.nodeType === 1 ) {
 
 										return false;
@@ -1032,7 +1032,7 @@ Expr = jQuery.expr = {
 									( diff = nodeIndex = 0 ) || start.pop() ) ) {
 
 									if ( ( ofType ?
-										node.nodeName.toLowerCase() === name :
+										nodeName( node, name ) :
 										node.nodeType === 1 ) &&
 										++diff ) {
 
@@ -1198,9 +1198,8 @@ Expr = jQuery.expr = {
 
 			// In CSS3, :checked should return both checked and selected elements
 			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
-			var nodeName = elem.nodeName.toLowerCase();
-			return ( nodeName === "input" && !!elem.checked ) ||
-				( nodeName === "option" && !!elem.selected );
+			return ( nodeName( elem, "input" ) && !!elem.checked ) ||
+				( nodeName( elem, "option" ) && !!elem.selected );
 		},
 
 		selected: function( elem ) {
@@ -1246,13 +1245,12 @@ Expr = jQuery.expr = {
 		},
 
 		button: function( elem ) {
-			var name = elem.nodeName.toLowerCase();
-			return name === "input" && elem.type === "button" || name === "button";
+			return nodeName( elem, "input" ) && elem.type === "button" ||
+				nodeName( elem, "button" );
 		},
 
 		text: function( elem ) {
-			return elem.nodeName.toLowerCase() === "input" &&
-				elem.type === "text";
+			return nodeName( elem, "input" ) && elem.type === "text";
 		},
 
 		// Position-in-collection
@@ -1446,7 +1444,7 @@ function addCombinator( matcher, combinator, base ) {
 					if ( elem.nodeType === 1 || checkNonElements ) {
 						outerCache = elem[ expando ] || ( elem[ expando ] = {} );
 
-						if ( skip && skip === elem.nodeName.toLowerCase() ) {
+						if ( skip && nodeName( elem, skip ) ) {
 							elem = elem[ dir ] || elem;
 						} else if ( ( oldCache = outerCache[ key ] ) &&
 							oldCache[ 0 ] === dirruns && oldCache[ 1 ] === doneName ) {