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| 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_one": 1 |
| 9 }; |
| 10 target.__proto__ = { |
| 11 "target_two": 2 |
| 12 }; |
| 13 var handler = { |
| 14 enumerate: function(target) { |
| 15 function* keys() { |
| 16 yield "foo"; |
| 17 yield "bar"; |
| 18 } |
| 19 return keys(); |
| 20 } |
| 21 } |
| 22 |
| 23 var proxy = new Proxy(target, handler); |
| 24 |
| 25 function TestForIn(receiver, expected) { |
| 26 var result = []; |
| 27 for (var k in receiver) { |
| 28 result.push(k); |
| 29 } |
| 30 assertEquals(expected, result); |
| 31 } |
| 32 |
| 33 TestForIn(proxy, ["foo", "bar"]); |
| 34 |
| 35 // Properly call traps on proxies on the prototype chain. |
| 36 var receiver = { |
| 37 "receiver_one": 1 |
| 38 }; |
| 39 receiver.__proto__ = proxy; |
| 40 // TODO(jkummerow): Needs proper 'has' trap; implement that and enable this! |
| 41 // TestForIn(receiver, ["receiver_one", "foo", "bar"]); |
| 42 |
| 43 // Fall through to default behavior when trap is undefined. |
| 44 handler.enumerate = undefined; |
| 45 TestForIn(proxy, ["target_one", "target_two"]); |
| 46 delete handler.enumerate; |
| 47 TestForIn(proxy, ["target_one", "target_two"]); |
| 48 |
| 49 // Non-string keys must be filtered. |
| 50 function TestNonStringKey(key) { |
| 51 handler.enumerate = function(target) { |
| 52 function* keys() { yield key; } |
| 53 return keys(); |
| 54 } |
| 55 assertThrows("for (var k in proxy) {}", TypeError); |
| 56 } |
| 57 |
| 58 TestNonStringKey(1); |
| 59 TestNonStringKey(3.14); |
| 60 TestNonStringKey(Symbol("foo")); |
| 61 TestNonStringKey({bad: "value"}); |
| 62 TestNonStringKey(null); |
| 63 TestNonStringKey(undefined); |
| 64 TestNonStringKey(true); |
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