Add grouping selectors

Author: eush77

README.md

@@ -27,9 +27,9 @@ select(ast, 'paragraph emphasis > text')
 - [x] Child selectors: `paragraph > text`
 - [x] Sibling selectors: `paragraph ~ text`
 - [x] Adjacent sibling selectors: `paragraph + text`
+- [x] Group selectors: `paragraph, text`
 - [ ] Attribute selectors: `text[value*="substr"]`
 - [ ] Universal selectors: `*`
-- [ ] Group selectors: `paragraph, text`
 
 ## API
 

lib/select.js

@@ -1,9 +1,17 @@
 'use strict';
 
-
 var select = exports;
 
 
+select.selectors = function (selector, ast) {
+  var result = [];
+  selector.selectors.forEach(function (selector) {
+    append(result, select.ruleSet(selector, ast));
+  });
+  return result;
+};
+
+
 select.ruleSet = function (selector, ast) {
   return select.rule(selector.rule, ast);
 };

test/test.js

@@ -71,3 +71,15 @@ test('siblings', function (t) {
   ]);
   t.end();
 });
+
+
+test('grouping', function (t) {
+  t.deepEqual(select(ast, 'list, heading + heading'), [
+    path(ast, [4]),
+    path(ast, [4, 1, 1]),
+    path(ast, [4, 1, 1, 0, 1]),
+    path(ast, [6]),
+    path(ast, [1])
+  ]);
+  t.end();
+});