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src/selector/selector.js

@@ -61,7 +61,7 @@ jQuery.extend({
 			},
 			_prefix: "z=a[m[3]];if(!z||/href|src/.test(m[3]))z=jQuery.attr(a,m[3]);"
 		},
-		"[": "jQuery.find(m[2],a).length"
+		"[": "parseInt(m[2])?jQuery.nth(a.parentNode.firstChild,parseInt(m[2]),'nextSibling',a)==a:jQuery.find(m[2],a).length"
 	},
 
 	// The regular expressions that power the parsing engine

src/selector/selectorTest.js

@@ -85,7 +85,7 @@ test("multiple", function() {
 });
 
 test("child and adjacent", function() {
-	expect(14);
+	expect(22);
 	t( "Child", "p > a", ["simon1","google","groups","mark","yahoo","simon"] );
 	t( "Child", "p> a", ["simon1","google","groups","mark","yahoo","simon"] );
 	t( "Child", "p >a", ["simon1","google","groups","mark","yahoo","simon"] );
@@ -99,7 +99,18 @@ test("child and adjacent", function() {
 	t( "Adjacent", "a+a", ["groups"] );
 	t( "Adjacent", "p + p", ["ap","en","sap"] );
 	t( "Comma, Child, and Adjacent", "a + a, code > a", ["groups","anchor1","anchor2"] );
+
 	t( "First Child", "p:first-child", ["firstp","sndp"] );
+	t( "Nth Child", "p:nth-child(1)", ["firstp","sndp"] );
+	t( "First Child, XPath", "p[1]", ["firstp","sndp"] );
+
+	t( "Last Child", "p:last-child", ["sap"] );
+	t( "Last Child, XPath", "p[3]", ["sap"] );
+
+	t( "Nth-child", "#main form > *:nth-child(2)", ["text2"] );
+	t( "Nth-child, XPath", "#main form > *[2]", ["text2"] );
+	t( "Nth-child", "#main form > :nth-child(2)", ["text2"] );
+	t( "Nth-child, XPath", "#main form > [2]", ["text2"] );
 });
 
 test("attributes", function() {
@@ -132,7 +143,7 @@ test("attributes", function() {
 	t( ":not() Equals quoted attribute", "select:not([@name='select1'])", ["select2", "select3"]);
 });
 
-test("pseudo (:) selctors", function() {
+test("pseudo (:) selectors", function() {
 	expect(30);
 	t( "First Child", "p:first-child", ["firstp","sndp"] );
 	t( "Last Child", "p:last-child", ["sap"] );