prefix-classes.patch

diff --git a/lib/functions/index.js b/lib/functions/index.js
index fb55b71..7211a6c 100644
--- a/lib/functions/index.js
+++ b/lib/functions/index.js
@@ -1106,64 +1106,24 @@ exports.selector = function selector(sel){
   return stack.length ? utils.compileSelectors(stack).join(',') : '&';
 };
 
-function prefixNode(prefix, node) {
-  switch (node.nodeName) {
-    case 'function':
-    case 'ident':
-      return node.name;
-    case 'literal':
-    case 'string':
-      if (prefix && !node.prefixed && !node.val.nodeName) {
-        node.val = node.val.replace(/\./g, '.' + prefix);
-        node.prefixed = true;
-      }
-      return node.val;
-    case 'unit':
-    default:
-      return node.val;
-  }
-}
-
-function prefixClassesForSelector(prefix, selector) {
-  selector.segments.forEach(function (segment) {
-    prefixNode(prefix.string, segment);
-  });
-}
-
-function prefixClassesForBlock(prefix, block) {
-  if (block.nodes && block.nodes.length) {
-    block.nodes = block.nodes.map(function (node) {
-      if (node.nodeName == 'group' && node.nodes.length) {
-        node.nodes.forEach(function (selector) {
-          if (selector.segments) {
-            prefixClassesForSelector(prefix, selector);
-          } else {
-            prefixNode(prefix.string, selector);
-          }
-        });
-      } else if (node.nodeName == 'block') {
-        return prefixClassesForBlock(prefix, node);
-      }
-      return node;
-    });
-  }
-  return block;
-}
-
 /**
  * Prefix css classes in a block
  *
- * @param {String} [prefix]
- * @param {Block} [block]
+ * @param {String} prefix
+ * @param {Block} block
  * @return {Block}
- * @api public
+ * @api private
  */
 
 exports['-prefix-classes'] = function prefixClasses(prefix, block){
   utils.assertString(prefix, 'prefix');
   utils.assertType(block, 'block', 'block');
+  var _prefix = this.prefix;
 
-  return prefixClassesForBlock(prefix, block);
+  this.prefix = prefix.string;
+  block = this.visit(block);
+  this.prefix = _prefix;
+  return block;
 };
 
 /**