Implement Object.prototype.isPropertyOf

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com

Author: galpeter

jerry-core/ecma/builtin-objects/ecma-builtin-object-prototype.cpp

@@ -189,7 +189,48 @@ static ecma_completion_value_t
 ecma_builtin_object_prototype_object_is_prototype_of (ecma_value_t this_arg, /**< this argument */
                                                       ecma_value_t arg) /**< routine's first argument */
 {
-  ECMA_BUILTIN_CP_UNIMPLEMENTED (this_arg, arg);
+  /* 1. Is the argument an object? */
+  if (!ecma_is_value_object (arg))
+  {
+    return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
+  }
+
+  ecma_completion_value_t return_value = ecma_make_empty_completion_value ();
+
+  /* 2. ToObject(this) */
+  ECMA_TRY_CATCH (obj_value,
+                  ecma_op_to_object (this_arg),
+                  return_value);
+
+  ecma_object_t *obj_p = ecma_get_object_from_value (obj_value);
+
+  /* 3. Compare prototype to object */
+  ECMA_TRY_CATCH (v_obj_value,
+                  ecma_op_to_object (arg),
+                  return_value);
+
+  ecma_object_t *v_obj_p = ecma_get_object_from_value (v_obj_value);
+
+  do
+  {
+    v_obj_p = ecma_get_object_prototype (v_obj_p);
+    if (v_obj_p == NULL)
+    {
+      return_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
+      break;
+    }
+    else if (v_obj_p == obj_p)
+    {
+      return_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
+      break;
+    }
+  } while (true);
+
+  ECMA_FINALIZE (v_obj_value);
+
+  ECMA_FINALIZE (obj_value);
+
+  return return_value;
 } /* ecma_builtin_object_prototype_object_is_prototype_of */
 
 /**

tests/jerry/object_prototype_isprototypeof.js

@@ -0,0 +1,33 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+function Function_A() { }
+function Function_B() { }
+Function_B.prototype = new Function_A();
+
+function Function_C() { }
+Function_C.prototype = new Function_B();
+
+function Function_D() { }
+Function_D.prototype = new Function_C();
+
+var d_instance = new Function_D();
+
+assert (Function_A.prototype.isPrototypeOf (d_instance) === true)
+assert (Function_A.prototype.isPrototypeOf (Array) === false)
+
+
+assert (Function_A.prototype.isPrototypeOf.call(0, 0) === false);
+assert (Function_A.prototype.isPrototypeOf.call(Function_A, 0) === false);