fix(watcher): hash-key convertor issue #119

Author: a8m

src/_provider/watcher.js

@@ -41,7 +41,20 @@ angular.module('a8m.filter-watcher', [])
        * @returns {string}
        */
       function getHashKey(fName, args) {
-        return [fName, angular.toJson(args)]
+        function replacerFactory() {
+          var cache = [];
+          return function(key, val) {
+            if(isObject(val) && !isNull(val)) {
+              if (~cache.indexOf(val)) return '[Circular]';
+              cache.push(val)
+            }
+            if($window == val) return '$WINDOW';
+            if($window.document == val) return '$DOCUMENT';
+            if(isScope(val)) return '$SCOPE';
+            return val;
+          }
+        }
+        return [fName, JSON.stringify(args, replacerFactory())]
           .join('#')
           .replace(/"/g,'');
       }
@@ -130,7 +143,6 @@ angular.module('a8m.filter-watcher', [])
         isMemoized: $$isMemoized,
         memoize: $$memoize
       }
-
     }];
   });