Put maybe-action transform in the parser actions, not the Action constructor

Author: jcoglan

src/ast/action.js

@@ -1,12 +1,8 @@
 'use strict';
 
-var util  = require('../util');
-var Maybe = require('./maybe');
+var util = require('../util');
 
 var Action = function(expression, actionName) {
-  if (expression instanceof Maybe)
-    return new Maybe(new Action(expression._expression, actionName));
-
   this._expression = expression;
   this._actionName = actionName;
 };

src/compiler.js

@@ -47,7 +47,12 @@ var actions = {
   },
 
   action: function(text, a, b, elements) {
-    return new Action(elements[0], elements[2].id.text);
+    var actionName = elements[2].id.text;
+
+    if (elements[0] instanceof Maybe)
+      return new Maybe(new Action(elements[0]._expression, actionName));
+    else
+      return new Action(elements[0], actionName);
   },
 
   sequence: function(text, a, b, elements) {