updated parser to handle empty string

Author: Thomas Bell

lexersrc/parser.y

@@ -7,7 +7,12 @@
 %%
 
 parsedargs
-	: arguments EOF
+	: EOF 
+	{
+		$$ = [undefined];
+		return $$
+	}
+	| arguments EOF
 		{ 
 			$$ = $1;
 			return $$; 
@@ -19,19 +24,19 @@ arguments
 			$$ = [$1]; 
 		}
 	| JSON 
-		{{ 
+		{
 			$$ = [$1];
-		}}
+		}
 	| arguments stringarg
 		{ 
 			$1.push($2);
 			$$ = $1;
 		}
 	| arguments JSON
-		{{ 
+		{
 			$1.push($2)
 			$$ = $1;
-		}}
+		}
 	;
 
 stringarg

src/Parser.js

@@ -179,7 +179,7 @@ describe('Service: ngDragDropService', function() {
       var callbackName = "startDrag("+ JSON.stringify(expectedData) +")";
       ngDragDropService.callEventCallback(localScope, callbackName, {}, {});
   });
-  
+
   it('should parse json objects along with non json objects', function(){
       var localScope = rootScope.$new();
       var expectedData = {r1: 1, r2: 2};
@@ -203,4 +203,17 @@ describe('Service: ngDragDropService', function() {
       ngDragDropService.callEventCallback(localScope, callbackName, {}, {});
   });
 
+  it('should parse empty arguments', function(){
+      var localScope = rootScope.$new();
+      var expectedEvent = {"foo": "bar"};
+      var expectedUI = {"bar":"baz"};
+      localScope.startDrag = function(event, ui, data){
+        expect(event).toEqual(expectedEvent);
+        expect(expectedUI).toEqual(expectedUI);
+        expect(data).toBe(undefined);
+      };
+      var callbackName = "startDrag()";
+      ngDragDropService.callEventCallback(localScope, callbackName, expectedEvent, expectedUI);
+  }); 
+
 });