Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Flags: --harmony-proxies |
| 6 | |
| 7 | var target = { |
| 8 | target: 1 |
| 9 | }; |
| 10 | target.__proto__ = { |
| 11 | target_proto: 2 |
| 12 | }; |
| 13 | |
| 14 | var handler = { |
| 15 | ownKeys: function(target) { |
| 16 | return ["foo", "bar", Symbol("baz"), "non-enum", "not-found"]; |
| 17 | }, |
| 18 | getOwnPropertyDescriptor: function(target, name) { |
| 19 | if (name == "non-enum") return {configurable: true}; |
| 20 | if (name == "not-found") return undefined; |
| 21 | return {enumerable: true, configurable: true}; |
| 22 | } |
| 23 | } |
| 24 | |
| 25 | var proxy = new Proxy(target, handler); |
| 26 | |
| 27 | // Object.keys() ignores symbols and non-enumerable keys. |
| 28 | assertEquals(["foo", "bar"], Object.keys(proxy)); |
| 29 | |
| 30 | // Edge case: no properties left after filtering. |
| 31 | handler.getOwnPropertyDescriptor = undefined; |
| 32 | assertEquals([], Object.keys(proxy)); |
| 33 | |
| 34 | // Throwing shouldn't crash. |
| 35 | handler.getOwnPropertyDescriptor = function() { throw new Number(1); }; |
| 36 | assertThrows("Object.keys(proxy)", Number); |
| 37 | |
| 38 | // Fall through to target if there is no trap. |
| 39 | handler.ownKeys = undefined; |
| 40 | assertEquals(["target"], Object.keys(proxy)); |
| 41 | assertEquals(["target"], Object.keys(target)); |