Version 1.1.0-dev.5.1

dart/sdk/lib/_internal/lib/js_rti.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This part contains helpers for supporting runtime type information.
  *
  * The helper use a mixture of Dart and JavaScript objects. To indicate which is
  * used where we adopt the scheme of using explicit type annotation for Dart
  * objects and 'var' or omitted return type for JavaScript objects.
@@ skipping 505 matching lines @@
   return true;
 }
 
 bool areAssignableMaps(var s, var t) {
   if (isNull(t)) return true;
   if (isNull(s)) return false;
 
   assert(isJsObject(s));
   assert(isJsObject(t));
 
-  return JS('bool', r'''
-     function (t, s, isAssignable) {
-       for (var $name in t) {
-         if (!s.hasOwnProperty($name)) {
-           return false;
-         }
-         var tType = t[$name];
-         var sType = s[$name];
-         if (!isAssignable.call$2(sType, tType)) {
-          return false;
-         }
-       }
-       return true;
-     }(#, #, #)
-  ''', t, s, RAW_DART_FUNCTION_REF(isAssignable));
+  List names =
+      JSArray.markFixedList(JS('', 'Object.getOwnPropertyNames(#)', t));
+  for (int i = 0; i < names.length; i++) {
+    var name = names[i];
+    if (JS('bool', '!Object.hasOwnProperty.call(#, #)', s, name)) {
+      return false;
+    }
+    var tType = JS('', '#[#]', t, name);
+    var sType = JS('', '#[#]', s, name);
+    if (!isAssignable(tType, sType)) return false;
+  }
+  return true;
 }
 
 bool isFunctionSubtype(var s, var t) {
   assert(hasField(t, '${JS_FUNCTION_TYPE_TAG()}'));
   if (hasNoField(s, '${JS_FUNCTION_TYPE_TAG()}')) return false;
   if (hasField(s, '${JS_FUNCTION_TYPE_VOID_RETURN_TAG()}')) {
     if (hasNoField(t, '${JS_FUNCTION_TYPE_VOID_RETURN_TAG()}') &&
         hasField(t, '${JS_FUNCTION_TYPE_RETURN_TYPE_TAG()}')) {
       return false;
     }
@@ skipping 145 matching lines @@
  * and [t] are Dart values.
  */
 bool isIdentical(var s, var t) => JS('bool', '# === #', s, t);
 
 /**
  * Returns [:true:] if the JavaScript values [s] and [t] are not identical. We
  * use this helper to avoid generating code under the invalid assumption that
  * [s] and [t] are Dart values.
  */
 bool isNotIdentical(var s, var t) => JS('bool', '# !== #', s, t);