[runtime] [proxy] implement [[Construct]]

test/mjsunit/harmony/proxies-construct.js

Index: test/mjsunit/harmony/proxies-construct.js
diff --git a/test/mjsunit/harmony/proxies-construct.js b/test/mjsunit/harmony/proxies-construct.js
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@@ -0,0 +1,97 @@
+// 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.
+
+// Flags: --harmony-proxies --harmony-reflect
+
+(function testNonConstructable() {
+  var proxy = new Proxy({},{});
+  assertThrows(function(){ new proxy() }, TypeError);
+
+  var proxy2 = new Proxy(proxy, {});
+  assertThrows(function(){ proxy2() }, TypeError);
+})();
+
+(function testFailingConstructRevoked() {
+  var pair = Proxy.revocable(Array, {});
+  var instance = new pair.proxy();
+  pair.revoke();
+  assertThrows(function(){ new pair.proxy() }, TypeError);
+})();
+
+(function testFailingGetTrap() {
+  var handler = {
+    get: function() {
+      throw TypeError();
+    }
+  }
+  var proxy = new Proxy({},{});
+  var proxy2 = new Proxy({}, proxy);
+  assertThrows(function(){ new proxy2() }, TypeError);
+})();
+
+(function testConstructFallback() {
+  var called = false;
+  function Target() {
+    called = true;
+    this.property1 = 'value1';
+  };
+  Target.prototype = {};
+  var proxy = new Proxy(Target, {});
+
+  assertFalse(called);
+  var instance = new proxy();
+  assertTrue(called);
+  assertEquals('value1', instance.property1);
+  assertSame(Target.prototype, Reflect.getPrototypeOf(instance));
+
+  var proxy2 = new Proxy(proxy, {});
+  called = false;
+  var instance2 = new proxy2();
+  assertTrue(called);
+  assertEquals('value1', instance2.property1);
+  assertSame(Target.prototype, Reflect.getPrototypeOf(instance));
+})();
+
+(function testConstructTrapDirectReturn() {
+  function Target(a, b) {
+      this.sum = a + b;
+  };
+  var handler = {
+      construct: function(t, c, args) {
+          return { sum: 42 };
+      }
+  };
+  var proxy = new Proxy(Target, handler);
+  assertEquals(42, (new proxy(1, 2)).sum);
+})();
+
+(function testConstructTrap() {
+  function Target(arg1, arg2) {
+    this.arg1 = arg1;
+    this.arg2 = arg2;
+  }
+  var seend_target, seen_arguments, seen_new_target;

[Toon Verwaest, 2015/12/08 20:27:22]

seend? :)

[Camillo Bruni, 2015/12/09 12:15:44]

see, seen, seend, isn't that obivous?

+  var handler = {
+    construct: function(target, args, new_target) {
+      seen_target = target;
+      seen_arguments = args;
+      seen_new_target = new_target;
+      return Reflect.construct(target, args, new_target);
+    }
+  }
+  var proxy = new Proxy(Target, handler);
+  var instance = new proxy('a', 'b');
+  assertEquals(Target, seen_target);
+  assertEquals(['a','b'], seen_arguments);
+  assertEquals(proxy, seen_new_target);
+  assertEquals('a', instance.arg1);
+  assertEquals('b', instance.arg2);
+
+  var instance2 = Reflect.construct(proxy, ['a1', 'b1'], Array);
+  assertEquals(Target, seen_target);
+  assertEquals(['a1', 'b1'], seen_arguments);
+  assertEquals(Array, seen_new_target);
+  assertEquals('a1', instance2.arg1);
+  assertEquals('b1', instance2.arg2);
+})()