OLD | NEW |
(Empty) | |
| 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 if (key === 'x') { |
| 19 return { |
| 20 value: 1, |
| 21 configurable: true |
| 22 }; |
| 23 } |
| 24 return undefined; |
| 25 } |
| 26 }); |
| 27 |
| 28 var x = 'local'; |
| 29 |
| 30 with (proxy) { |
| 31 assertEquals(1, x); |
| 32 } |
| 33 |
| 34 // One 'x' for HasBinding and one for GetBindingValue |
| 35 assertEquals(['assertEquals', 'x', 'x'], log); |
| 36 } |
| 37 TestBasics(); |
| 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 < 1) { |
| 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 one for GetBindingValue |
| 65 assertEquals(['assertEquals', 'x', 'x'], log); |
| 66 } |
| 67 TestInconsistent(); |
| 68 |
| 69 |
| 70 function TestUseProxyAsUnscopables() { |
| 71 var x = 1; |
| 72 var object = { |
| 73 x: 2 |
| 74 }; |
| 75 var calls = 0; |
| 76 var proxy = Proxy.create({ |
| 77 has: function(key) { |
| 78 calls++; |
| 79 assertEquals('x', key); |
| 80 return calls === 2; |
| 81 }, |
| 82 getPropertyDescriptor: function(key) { |
| 83 assertUnreachable(); |
| 84 } |
| 85 }); |
| 86 |
| 87 object[Symbol.unscopables] = proxy; |
| 88 |
| 89 with (object) { |
| 90 assertEquals(2, x); |
| 91 assertEquals(1, x); |
| 92 } |
| 93 |
| 94 // HasBinding, HasBinding |
| 95 assertEquals(2, calls); |
| 96 } |
| 97 TestUseProxyAsUnscopables(); |
| 98 |
| 99 |
| 100 function TestThrowInHasUnscopables() { |
| 101 var x = 1; |
| 102 var object = { |
| 103 x: 2 |
| 104 }; |
| 105 |
| 106 function CustomError() {} |
| 107 |
| 108 var calls = 0; |
| 109 var proxy = Proxy.create({ |
| 110 has: function(key) { |
| 111 if (calls++ === 0) { |
| 112 throw new CustomError(); |
| 113 } |
| 114 assertUnreachable(); |
| 115 }, |
| 116 getPropertyDescriptor: function(key) { |
| 117 assertUnreachable(); |
| 118 } |
| 119 }); |
| 120 |
| 121 object[Symbol.unscopables] = proxy; |
| 122 |
| 123 assertThrows(function() { |
| 124 with (object) { |
| 125 x; |
| 126 } |
| 127 }, CustomError); |
| 128 } |
| 129 TestThrowInHasUnscopables(); |
| 130 |
| 131 |
| 132 var global = this; |
| 133 function TestGlobalShouldIgnoreUnscopables() { |
| 134 global.x = 1; |
| 135 var proxy = Proxy.create({ |
| 136 getPropertyDescriptor: function() { |
| 137 assertUnreachable(); |
| 138 } |
| 139 }); |
| 140 global[Symbol.unscopables] = proxy; |
| 141 |
| 142 assertEquals(1, global.x); |
| 143 assertEquals(1, x); |
| 144 |
| 145 global.x = 2; |
| 146 assertEquals(2, global.x); |
| 147 assertEquals(2, x); |
| 148 |
| 149 x = 3; |
| 150 assertEquals(3, global.x); |
| 151 assertEquals(3, x); |
| 152 } |
| 153 TestGlobalShouldIgnoreUnscopables(); |
OLD | NEW |