Implement Proxy object [[Set]] internal method (jerryscript-project#3605

)

The algorithm is based on ECMA-262 v6, 9.5.9

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-proxy-object.c

@@ -530,8 +530,109 @@ ecma_proxy_object_set (ecma_object_t *obj_p, /**< proxy object */
                        ecma_value_t receiver) /**< receiver to invoke setter function */
 {
   JERRY_ASSERT (ECMA_OBJECT_IS_PROXY (obj_p));
-  JERRY_UNUSED_4 (obj_p, prop_name_p, value, receiver);
-  return ecma_raise_type_error (ECMA_ERR_MSG ("UNIMPLEMENTED: Proxy.[[Set]]"));
+
+  ecma_proxy_object_t *proxy_obj_p = (ecma_proxy_object_t *) obj_p;
+
+  /* 2. */
+  ecma_value_t handler = proxy_obj_p->handler;
+
+  /* 3. */
+  if (ecma_is_value_null (handler))
+  {
+    return ecma_raise_type_error (ECMA_ERR_MSG ("Handler can not be null"));
+  }
+
+  /* 4. */
+  JERRY_ASSERT (ecma_is_value_object (handler));
+
+  /* 5. */
+  ecma_value_t target = proxy_obj_p->target;
+
+  /* 6. */
+  ecma_value_t trap = ecma_op_get_method_by_magic_id (handler, LIT_MAGIC_STRING_SET);
+
+  /* 7. */
+  if (ECMA_IS_VALUE_ERROR (trap))
+  {
+    return trap;
+  }
+
+  ecma_object_t *target_obj_p = ecma_get_object_from_value (target);
+
+  /* 8. */
+  if (ecma_is_value_undefined (trap))
+  {
+    return ecma_op_object_put_with_receiver (target_obj_p, prop_name_p, value, receiver, false);
+  }
+
+  ecma_object_t *func_obj_p = ecma_get_object_from_value (trap);
+  ecma_value_t prop_name_value = ecma_make_prop_name_value (prop_name_p);
+  ecma_value_t args[] = { target, prop_name_value, value, receiver };
+
+  /* 9. */
+  ecma_value_t trap_result = ecma_op_function_call (func_obj_p, handler, args, 4);
+
+  ecma_deref_object (func_obj_p);
+
+  /* 10. */
+  if (ECMA_IS_VALUE_ERROR (trap_result))
+  {
+    return trap_result;
+  }
+
+  bool boolean_trap_result = ecma_op_to_boolean (trap_result);
+
+  ecma_free_value (trap_result);
+
+  /* 11. */
+  if (!boolean_trap_result)
+  {
+    return ECMA_VALUE_FALSE;
+  }
+
+  /* 12. */
+  ecma_property_descriptor_t target_desc;
+
+  ecma_value_t status = ecma_op_object_get_own_property_descriptor (target_obj_p, prop_name_p, &target_desc);
+
+  /* 13. */
+  if (ECMA_IS_VALUE_ERROR (status))
+  {
+    return status;
+  }
+
+  /* 14. */
+  if (ecma_is_value_true (status))
+  {
+    ecma_value_t ret_value = ECMA_VALUE_EMPTY;
+
+    if ((target_desc.flags & ECMA_PROP_IS_VALUE_DEFINED)
+        && !(target_desc.flags & ECMA_PROP_IS_CONFIGURABLE)
+        && !(target_desc.flags & ECMA_PROP_IS_WRITABLE)
+        && !ecma_op_same_value (value, target_desc.value))
+    {
+      ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("The property exists in the proxy target as a"
+                                                       " non-configurable and non-writable data property"
+                                                       " with a different value."));
+    }
+    else if (!(target_desc.flags & ECMA_PROP_IS_CONFIGURABLE)
+            && (target_desc.flags & (ECMA_PROP_IS_GET_DEFINED | ECMA_PROP_IS_SET_DEFINED))
+            && target_desc.set_p == NULL)
+    {
+      ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("The property exists in the proxy target as a"
+                                                       " non-configurable accessor property whitout a setter."));
+    }
+
+    ecma_free_property_descriptor (&target_desc);
+
+    if (ECMA_IS_VALUE_ERROR (ret_value))
+    {
+      return ret_value;
+    }
+  }
+
+  /* 15. */
+  return ECMA_VALUE_TRUE;
 } /* ecma_proxy_object_set */
 
 /**

tests/jerry/es2015/proxy_set.js

@@ -12,20 +12,128 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// TODO: Update these tests when the internal routine has been implemented
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// test basic funcionality
+function Monster() {
+  this.eyeCount = 4;
+}
+
+var handler = {
+  set(obj, prop, value) {
+    if (prop == 'eyeCount') {
+      obj[prop] = value;
+    } else {
+      obj[prop] = "foo";
+    }
+  }
+};
+
+var monster = new Monster();
+var proxy = new Proxy(monster, handler);
+
+proxy.eyeCount = 1;
+proxy.foo = "bar";
+
+assert(monster.eyeCount === 1);
+assert(monster.foo === "foo");
+
+var target = { foo: "foo"};
+var handler = {
+  set: function(obj, prop, value) {
+   	obj[prop] = ""; 
+  }
+};
+var proxy = new Proxy(target, handler);
+
+proxy.foo = 12;
+assert(target.foo === "");
+
+var properties = ["bla", "0", 1, Symbol(), {[Symbol.toPrimitive]() {return "a"}}];
 
 var target = {};
-var handler = { set (target) {
-  throw 42;
-}};
+var handler = {};
+var proxy = new Proxy(target, handler);
+
+// test when property does not exist on target
+for (var p of properties) {
+  proxy.p = 42;
+  assert(target.p === 42);
+}
+
+// test when property exists as writable data on target
+for (var p of properties) {
+  Object.defineProperty(target, p, {
+    writable: true,
+    value: 24
+  });
+
+  proxy.p = 42;
+  assert(target.p === 42);
+}
+
+// test when target is a proxy
+var target = {};
+var handler = {
+  set(obj, prop, value) {
+    obj[prop] = value;
+  }
+};
 
 var proxy = new Proxy(target, handler);
+var proxy2 = new Proxy(proxy, handler);
+
+proxy2.prop = "foo";
+
+assert(target.prop === "foo");
+
+// test when handler is null
+var target = {};
+var handler = {
+  set(obj, prop, value) {
+    obj[prop] = value;
+  }
+};
+
+var revocable = Proxy.revocable (target, {});
+var proxy = revocable.proxy;
+revocable.revoke();
 
 try {
-  // vm_op_set_value
-  proxy.a = 5
+  proxy.prop = 42;
   assert(false);
 } catch (e) {
   assert(e instanceof TypeError);
 }
 
+// test when invariants gets violated
+var target = {};
+var handler = { set() {return 42} };
+var proxy = new Proxy(target, handler);
+
+Object.defineProperty(target, "key", {
+  configurable: false,
+  writable: false,
+  value: 0
+});
+
+try {
+  proxy.key = 600;
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+Object.defineProperty(target, "key2", {
+  configurable: false,
+  set: undefined
+});
+
+try {
+  proxy.key2 = 500;
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}