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| 1 // Copyright 2014 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-unscopables |
| 6 // Flags: --harmony-proxies |
| 7 |
| 8 |
| 9 // TODO(arv): Once proxies can intercept symbols, add more tests. |
| 10 |
| 11 |
| 12 (function TestBasics() { |
| 13 var log = []; |
| 14 |
| 15 var proxy = Proxy.create({ |
| 16 getPropertyDescriptor: function(key) { |
| 17 log.push(key); |
| 18 print(key); |
| 19 if (key === 'x') { |
| 20 return { |
| 21 value: 1, |
| 22 configurable: true |
| 23 }; |
| 24 } |
| 25 return undefined; |
| 26 } |
| 27 }); |
| 28 |
| 29 var x = 'local'; |
| 30 |
| 31 with (proxy) { |
| 32 assertEquals(1, x); |
| 33 } |
| 34 |
| 35 // One 'x' for HasBinding and two for GetBindingValue |
| 36 assertEquals(['assertEquals', 'x', 'x', 'x'], log); |
| 37 })(); |
| 38 |
| 39 |
| 40 (function TestInconsistent() { |
| 41 var log = []; |
| 42 var calls = 0; |
| 43 |
| 44 var proxy = Proxy.create({ |
| 45 getPropertyDescriptor: function(key) { |
| 46 log.push(key); |
| 47 if (key === 'x' && calls < 2) { |
| 48 calls++; |
| 49 return { |
| 50 value: 1, |
| 51 configurable: true |
| 52 }; |
| 53 } |
| 54 return undefined; |
| 55 } |
| 56 }); |
| 57 |
| 58 var x = 'local'; |
| 59 |
| 60 with (proxy) { |
| 61 assertEquals(void 0, x); |
| 62 } |
| 63 |
| 64 // One 'x' for HasBinding and two for GetBindingValue |
| 65 assertEquals(['assertEquals', 'x', 'x', 'x'], log); |
| 66 })(); |
| 67 |
| 68 |
| 69 (function TestInconsistent2() { |
| 70 var log = []; |
| 71 var calls = 0; |
| 72 |
| 73 var proxy = Proxy.create({ |
| 74 getPropertyDescriptor: function(key) { |
| 75 log.push(key); |
| 76 if (key === 'x' && calls < 1) { |
| 77 calls++; |
| 78 return { |
| 79 value: 1, |
| 80 configurable: true |
| 81 }; |
| 82 } |
| 83 return undefined; |
| 84 } |
| 85 }); |
| 86 |
| 87 var x = 'local'; |
| 88 |
| 89 with (proxy) { |
| 90 assertEquals(void 0, x); |
| 91 } |
| 92 |
| 93 // One 'x' for HasBinding and one for GetBindingValue, the second one from |
| 94 // previous test is not called since the proxy reported that there is no 'x' |
| 95 // property when we did GetBindingValue. |
| 96 assertEquals(['assertEquals', 'x', 'x'], log); |
| 97 })(); |
| 98 |
| 99 |
| 100 (function TestUseProxyAsUnscopables() { |
| 101 var x = 1; |
| 102 var object = { |
| 103 x: 2 |
| 104 }; |
| 105 var calls = 0; |
| 106 var proxy = Proxy.create({ |
| 107 has: function(key) { |
| 108 calls++; |
| 109 assertEquals('x', key); |
| 110 return calls === 3; |
| 111 }, |
| 112 getPropertyDescriptor: function(key) { |
| 113 assertUnreachable(); |
| 114 return undefined; |
| 115 } |
| 116 }); |
| 117 |
| 118 object[Symbol.unscopables] = proxy; |
| 119 |
| 120 with (object) { |
| 121 assertEquals(2, x); |
| 122 assertEquals(1, x); |
| 123 } |
| 124 |
| 125 // HasBinding, GetBindingValue, HasBinding |
| 126 assertEquals(3, calls); |
| 127 })(); |
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