Implement Proxy object [[Set]] internal method (#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

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.
 
-var target = {};
-var handler = { set (target) {
-  throw 42;
-}};
+// 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 = {};
+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);
+}