fix(parse): fix context access and double function call

Fix a context duplication and invocation to a previous context when
doing an access modifier function on the result of a function
Currently, when doing `foo().bar()`, `foo` is called twice, the first
time to get the context and the second one for `bar` to get the
underlying object. Then the call to `bar` is called using the second
instance as self
This is equivalent to doing:
```
var instance1 = foo();
var instance2 = foo();
instance2.bar.apply(instance1);
```

Closes #2496

src/ng/parse.js

@@ -424,8 +424,8 @@ function parser(text, json, $filter, csp){
           text.substring(0, token.index) + "] can not be assigned to", token);
       }
       right = logicalOR();
-      return function(self, locals){
-        return left.assign(self, right(self, locals), locals);
+      return function(scope, locals){
+        return left.assign(scope, right(scope, locals), locals);
       };
     } else {
       return left;
@@ -542,12 +542,12 @@ function parser(text, json, $filter, csp){
     var field = expect().text;
     var getter = getterFn(field, csp);
     return extend(
-        function(self, locals) {
-          return getter(object(self, locals), locals);
+        function(scope, locals, self) {
+          return getter(self || object(scope, locals), locals);
         },
         {
-          assign:function(self, value, locals) {
-            return setter(object(self, locals), field, value);
+          assign:function(scope, value, locals) {
+            return setter(object(scope, locals), field, value);
           }
         }
     );
@@ -588,14 +588,14 @@ function parser(text, json, $filter, csp){
       } while (expect(','));
     }
     consume(')');
-    return function(self, locals){
+    return function(scope, locals){
       var args = [],
-          context = contextGetter ? contextGetter(self, locals) : self;
+          context = contextGetter ? contextGetter(scope, locals) : scope;
 
       for ( var i = 0; i < argsFn.length; i++) {
-        args.push(argsFn[i](self, locals));
+        args.push(argsFn[i](scope, locals));
       }
-      var fnPtr = fn(self, locals) || noop;
+      var fnPtr = fn(scope, locals, context) || noop;
       // IE stupidity!
       return fnPtr.apply
           ? fnPtr.apply(context, args)