Implement Object.prototype.propertyIsEnumerable().

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

Author: Zsolt Borbély

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

@@ -1,4 +1,5 @@
 /* Copyright 2014-2015 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.
@@ -226,7 +227,44 @@ static ecma_completion_value_t
 ecma_builtin_object_prototype_object_property_is_enumerable (ecma_value_t this_arg, /**< this argument */
                                                              ecma_value_t arg) /**< routine's first argument */
 {
-  ECMA_BUILTIN_CP_UNIMPLEMENTED (this_arg, arg);
+  ecma_completion_value_t return_value = ecma_make_empty_completion_value ();
+
+  /* 1. */
+  ECMA_TRY_CATCH (to_string_val,
+                  ecma_op_to_string (arg),
+                  return_value);
+
+  /* 2. */
+  ECMA_TRY_CATCH (obj_val,
+                  ecma_op_to_object (this_arg),
+                  return_value);
+
+  ecma_string_t *property_name_string_p = ecma_get_string_from_value (to_string_val);
+
+  ecma_object_t *obj_p = ecma_get_object_from_value (obj_val);
+
+  /* 3. */
+  ecma_property_t *property_p = ecma_op_object_get_own_property (obj_p, property_name_string_p);
+
+  /* 4. */
+  if (property_p != NULL)
+  {
+    bool is_enumerable = ecma_is_property_enumerable (property_p);
+
+    return_value = ecma_make_simple_completion_value (is_enumerable
+                                                      ? ECMA_SIMPLE_VALUE_TRUE
+                                                      : ECMA_SIMPLE_VALUE_FALSE);
+  }
+  else
+  {
+    return_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
+  }
+
+  ECMA_FINALIZE (obj_val);
+
+  ECMA_FINALIZE (to_string_val);
+
+  return return_value;
 } /* ecma_builtin_object_prototype_object_property_is_enumerable */
 
 /**

tests/jerry/object_prototype_propertyisenumerable.js

@@ -0,0 +1,98 @@
+// 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.
+
+var obj = {};
+
+// Test if the toString fails.
+try {
+  obj.propertyIsEnumerable({ toString: function() { throw new ReferenceError ("foo"); } });
+
+  assert (false);
+} catch (e) {
+  assert (e.message === "foo");
+  assert (e instanceof ReferenceError);
+}
+
+// Test if the toObject fails.
+var obj1;
+try {
+  obj1.propertyIsEnumerable("fail");
+
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+var array = [];
+obj.prop = "bar";
+array[0] = "bar";
+
+assert (obj.propertyIsEnumerable('prop') === true);
+assert (array.propertyIsEnumerable(0) === true);
+
+assert (obj.propertyIsEnumerable('length') === false);
+assert (array.propertyIsEnumerable('length') === false);
+assert (Math.propertyIsEnumerable('random') === false);
+
+// Creating a new property
+Object.defineProperty(obj, 'prop1', { value: 'foo', enumerable: true });
+Object.defineProperty(obj, 'prop2', { value: 'foo', enumerable: false });
+Object.defineProperty(obj, 'prop3', { value: 'foo' });
+assert (obj.propertyIsEnumerable('prop1') === true);
+assert (obj.propertyIsEnumerable('prop2') === false);
+assert (obj.propertyIsEnumerable('prop3') === false);
+
+Object.defineProperty(array, 'prop1', { value: 'foo', enumerable: true });
+Object.defineProperty(array, 'prop2', { value: 'foo', enumerable: false });
+Object.defineProperty(array, 'prop3', { value: 'foo' });
+assert (array.propertyIsEnumerable('prop1') === true);
+assert (array.propertyIsEnumerable('prop2') === false);
+assert (array.propertyIsEnumerable('prop3') === false);
+
+// Modify an existing one
+Object.defineProperty(obj, 'prop', { value: 'foo', enumerable: false });
+assert (obj.propertyIsEnumerable('prop') === false);
+Object.defineProperty(obj, 'prop', { value: 'foo', enumerable: true });
+assert (obj.propertyIsEnumerable('prop') === true);
+
+Object.defineProperty(array, 0, { value: 'foo', enumerable: false });
+assert (array.propertyIsEnumerable(0) === false);
+Object.defineProperty(array, 0, { value: 'foo', enumerable: true });
+assert (array.propertyIsEnumerable(0) === true);
+
+// Enumerability of inherited properties
+function construct1()
+{
+  this.prop1 = 'foo';
+}
+
+function construct2()
+{
+  this.prop2 = 'foo';
+}
+
+construct2.prototype = new construct1;
+construct2.prototype.constructor = construct2;
+
+var obj2 = new construct2();
+obj2.prop3 = 'foo';
+
+assert (obj2.propertyIsEnumerable('prop3') === true);
+assert (obj2.propertyIsEnumerable('prop2') === true);
+assert (obj2.propertyIsEnumerable('prop1') === false);
+
+obj2.prop1 = 'foo';
+
+assert (obj2.propertyIsEnumerable('prop1') === true);