Re-target for ES.Next (#3901)

A list of changes:
- 'es2015-subset' profile is deprecated, and an 'es.next' profile is added.
- The default profile is changed to 'es.next'
- Renamed the JERRY_ES2015 guard to JERRY_ESNEXT
- Renamed JERRY_ES2015_BUILTIN_* guards to JERRY_BUILTIN_*
- Moved es2015 specific tests to a new 'es.next' subdirectory
- Updated docs, targets, and test runners to reflect these changes

Resolves #3737.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/jerry/es.next/proxy_delete.js

@@ -0,0 +1,164 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// 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.
+
+// 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 = {};
+var handler = { deleteProperty (target) {
+  throw 42;
+}, get (object, propName) {
+  if (propName == "length") {
+    return 5;
+  }
+}};
+
+var proxy = new Proxy(target, handler);
+
+var a = 5;
+
+// ecma_op_delete_binding
+with (proxy) {
+  delete a
+}
+
+try {
+  // 22.1.3.16.6.e
+  Array.prototype.pop.call(proxy);
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+// test basic functionality
+var target = {foo: "bar"};
+var handler = {
+  deleteProperty(obj, prop) {
+    delete obj[prop];
+  }
+}
+
+var proxy = new Proxy(target, handler);
+
+assert(target.foo === "bar")
+assert(proxy.foo === "bar");
+
+assert(delete proxy.foo === false);
+
+assert(target.foo === undefined);
+assert(proxy.foo === undefined);
+
+assert(target.bar === undefined);
+assert(delete proxy.bar == false);
+assert(target.bar === undefined);
+
+var handler2 = {
+  deleteProperty(obj, prop) {
+    delete obj[prop];
+    return true;
+  }
+}
+
+var proxy = new Proxy(target, handler2);
+
+assert(target.bar === undefined);
+assert(delete proxy.bar == true);
+assert(target.bar === undefined);
+
+// test with no trap
+var target = {1: 42};
+var handler = {};
+var proxy = new Proxy(target, handler);
+
+assert(target[1] === 42)
+assert(delete proxy[1] === true)
+assert(target[1] === undefined);
+
+// test with undefined trap
+var target = {2: 52};
+var handler = { deleteProperty: null};
+var proxy = new Proxy(target, handler);
+
+assert(target[2] === 52)
+assert(delete proxy[2] === true)
+assert(target[2] === undefined);
+
+// test when trap is invalid
+var target = {};
+var handler = { deleteProperty: true };
+var proxy = new Proxy(target, handler);
+
+try {
+  delete proxy[0];
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// test when handler is null
+var revocable = Proxy.revocable ({}, {});
+var proxy = revocable.proxy;
+revocable.revoke();
+
+try {
+  delete proxy.foo;
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// test when target is proxy
+var target = {prop: "foo"};
+var handler = {
+  deleteProperty(obj, prop) {
+    delete obj[prop];
+  }
+};
+
+var proxy1 = new Proxy(target, handler);
+var proxy2 = new Proxy(proxy1, handler);
+
+assert(target.prop === "foo");
+assert(proxy1.prop === "foo");
+assert(proxy2.prop === "foo");
+
+delete proxy2.prop;
+
+assert(target.prop === undefined);
+assert(proxy1.prop === undefined);
+assert(proxy2.prop === undefined);
+
+// tests when invariants gets violated
+var target = {};
+var handler = {
+  deleteProperty(obj, prop) {
+    delete obj[prop];
+    return true;
+  }
+};
+
+Object.defineProperty(target, "foo", {
+  configurable: false,
+  value: "foo"
+});
+
+var proxy = new Proxy (target, handler);
+
+try {
+  delete proxy.foo;
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}