feat(scope.$eval): Allow passing locals to the expression

Author: vojtajina

Diff for: src/service/scope.js

@@ -503,12 +503,13 @@ function $RootScopeProvider(){
        * @param {(string|function())=} expression An angular expression to be executed.
        *
        *    - `string`: execute using the rules as defined in  {@link guide/dev_guide.expressions expression}.
-       *    - `function(scope)`: execute the function with the current `scope` parameter.
+       *    - `function(scope, locals)`: execute the function with the current `scope` parameter.
+       * @param {Object=} locals Hash object of local variables for the expression.
        *
        * @returns {*} The result of evaluating the expression.
        */
-      $eval: function(expr) {
-        return $parse(expr)(this);
+      $eval: function(expr, locals) {
+        return $parse(expr)(this, locals);
       },
 
       /**

Diff for: test/service/scopeSpec.js

@@ -416,8 +416,19 @@ describe('Scope', function() {
       $rootScope.$eval(function(self) {self.b=2;});
       expect($rootScope.b).toEqual(2);
     }));
+
+
+    it('should allow passing locals to the expression', inject(function($rootScope) {
+      expect($rootScope.$eval('a+1', {a: 2})).toBe(3);
+
+      $rootScope.$eval(function(scope, locals) {
+        scope.c = locals.b + 4;
+      }, {b: 3});
+      expect($rootScope.c).toBe(7);
+    }));
   });
 
+
   describe('$evalAsync', function() {
 
     it('should run callback before $watch', inject(function($rootScope) {