Implement Proxy object [[Construct]] internal method (#3657)

The algorithm is based on ECMA-262 v6, 9.5.14

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

tests/jerry/es2015/proxy_construct.js

@@ -12,7 +12,9 @@
 // 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.
 
 var target = function () {};
 var handler = { construct (target) {
@@ -26,13 +28,138 @@ try {
   new proxy(5)
   assert(false);
 } catch (e) {
-  assert(e instanceof TypeError);
+  assert(e === 42);
 }
 
 try {
   // 22.1.2.3.4.a
   Array.of.call(proxy);
   assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+// test basic functionality
+var proxy = new Proxy({},{});
+
+try {
+  new proxy();
+  assert(false);
 } catch (e) {
   assert(e instanceof TypeError);
 }
+
+var proxy2 = new Proxy(proxy, {});
+
+try {
+  new proxy2();
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var called = false;
+
+function Target() {
+  called = true;
+  this.property1 = 'value1';
+};
+
+Target.prototype = {};
+var proxy = new Proxy(Target, {});
+
+assert(called === false);
+
+var instance = new proxy();
+
+assert(called === true);
+assert('value1' === instance.property1);
+assert(Target.prototype === Object.getPrototypeOf(instance));
+
+var proxy2 = new Proxy(proxy, {});
+called = false;
+var instance2 = new proxy2();
+
+assert(called === true);
+assert('value1' === instance2.property1);
+assert(Target.prototype === Object.getPrototypeOf(instance));
+
+function Target2(a, b) {
+  this.sum = a + b;
+};
+var handler = {
+  construct(t, c, args) {
+      return { sum: 42 };
+  }
+};
+var proxy = new Proxy(Target2, handler);
+assert((new proxy(1, 2)).sum === 42);
+
+function Target3(arg1, arg2) {
+  this.arg1 = arg1;
+  this.arg2 = arg2;
+}
+var seen_target, seen_arguments, seen_new_target;
+var handler = {
+  construct(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(Target3, handler);
+var instance = new proxy('a', 'b');
+
+assert(Target3 === seen_target);
+assert(JSON.stringify(seen_arguments) === '["a","b"]');
+assert(proxy === seen_new_target);
+assert('a' === instance.arg1);
+assert('b' === instance.arg2);
+
+var instance2 = Reflect.construct(proxy, ['a1', 'b1'], Array);
+assert(Target3 === seen_target);
+assert(JSON.stringify(seen_arguments) === '["a1","b1"]');
+assert(Array === seen_new_target);
+assert('a1'=== instance2.arg1);
+assert('b1' === instance2.arg2);
+
+var p = new Proxy(function() {}, {
+  construct: function(target, argumentsList, newTarget) {
+    throw 42;
+  }
+});
+
+try {
+  new p();
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+// test when invariants gets violated
+var p = new Proxy(function() {}, {
+  construct: function(target, argumentsList, newTarget) {
+    return 1;
+  }
+});
+
+try {
+  new p();
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError); 
+}
+
+var p = new Proxy({}, {
+  construct: function(target, argumentsList, newTarget) {
+    return {};
+  }
+});
+
+try {
+  new p();
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError); 
+}

tests/jerry/es2015/proxy_define_own_property.js

@@ -23,10 +23,5 @@ var handler = { defineProperty (target) {
 
 var proxy = new Proxy(target, handler);
 
-try {
-  // 22.1.2.3.8.c
-  Array.of.call(proxy, 5)
-  assert(false);
-} catch (e) {
-  assert(e instanceof TypeError);
-}
+// 22.1.2.3.8.c
+Array.of.call(proxy, 5)