adds nth-child category

Author: GGAlanSmithee

src/core/selector-type.js

@@ -26,6 +26,7 @@ export const SelectorType = {
     AdjacentSiblingCombinator : 16,
     GeneralSiblingCombinator : 17,
     Root : 18,                // E:root, :root
+    NthChild : 19
 };
 
 /**
@@ -36,6 +37,7 @@ export const SelectorType = {
 const SelectorCategoryRegex = {
     Type : /^[A-Za-z]+/,
     Attribute : /^(\#|\.)?[A-Za-z]+\[.+?\]$/,
+    NthChild : /^(\#|\.)?([A-Za-z]+)?\:nth-child\(([0-9]+|n[0-9]+\+[0-9]|odd|even)\)/
 };
 
 /**
@@ -60,6 +62,8 @@ const SelectorTypeRegex = {
     AttributeSuffix : /^(\#|\.)?[A-Za-z]+\[[A-Za-z]+\$\=\"[A-Za-z]+\"\]$/,   // E[attr$=value]
     AttributeContains : /^(\#|\.)?[A-Za-z]+\[[A-Za-z]+\*\=\"[A-Za-z]+\"\]$/, // E[attr*=value]
     Root : /^(\#|\.)?[a-zA-Z]*:root/,                                        // E:root, :root
+    // todo add nth-child selectors like in attribute, odd, even, #n+# etc)
+    
 };
 
 /**
@@ -82,6 +86,10 @@ export default function getType(selector) {
         return SelectorType.Root;
     }
 
+    if (SelectorCategoryRegex.NthChild.test(selector)) {
+        return SelectorType.NthChild;
+    }
+    
     if (SelectorCategoryRegex.Attribute.test(selector)) {
         return SelectorTypeRegex.AttributePrefix.test(selector) ? SelectorType.AttributePrefix :
                SelectorTypeRegex.AttributeSuffix.test(selector) ? SelectorType.AttributeSuffix :

test.css

@@ -131,5 +131,9 @@ describe('getType(selector)', function() {
         it('Root selector (.class:root)', () => {
             expect(getType('.myClass:root')).to.equal(SelectorType.Root);
         });
+        
+        it('Nth-child Selector', () => {
+            expect(getType('div:nth-child(2)')).to.equal(SelectorType.NthChild);
+        });
     });
 });