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 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | |
| 6 | var properties = |
| 7 | ["bla", "0", 1, Symbol(), {[Symbol.toPrimitive]() {return "a"}}]; |
| 8 | |
| 9 | |
| 10 | function TestForwarding(handler, myDelete, shouldThrow) { |
| 11 | var target = {}; |
| 12 | var proxy = new Proxy(target, handler); |
| 13 | |
| 14 | assertFalse(target.hasOwnProperty("doesnotexist")); |
| 15 | assertTrue(myDelete(proxy, "doesnotexist")); |
| 16 | |
| 17 | for (p of properties) { |
| 18 | target[p] = 42; |
| 19 | assertTrue(myDelete(proxy, p)); |
| 20 | assertFalse(target.hasOwnProperty(p)); |
| 21 | } |
| 22 | |
| 23 | for (p of properties) { |
| 24 | Object.defineProperty(target, p, {value: 42, configurable: false}); |
| 25 | if (shouldThrow) { |
| 26 | assertThrows(() => myDelete(proxy, p), TypeError); |
| 27 | } else { |
| 28 | assertFalse(myDelete(proxy, p)); |
| 29 | } |
| 30 | assertTrue(target.hasOwnProperty(p)); |
| 31 | } |
| 32 | }; |
| 33 | |
| 34 | |
| 35 | (function () { |
| 36 | // No trap. |
| 37 | |
| 38 | var handler = {}; |
| 39 | |
| 40 | TestForwarding(handler, |
| 41 | (o, p) => delete o[p], false); |
| 42 | TestForwarding(handler, |
| 43 | (o, p) => Reflect.deleteProperty(o, p), false); |
| 44 | TestForwarding(handler, |
| 45 | (o, p) => {"use strict"; return delete o[p]}, true); |
| 46 | TestForwarding(handler, |
| 47 | (o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}, false); |
| 48 | })(); |
| 49 | |
| 50 | |
| 51 | (function () { |
| 52 | // "Undefined" trap. |
| 53 | |
| 54 | var handler = { deleteProperty: null }; |
| 55 | |
| 56 | TestForwarding(handler, |
| 57 | (o, p) => delete o[p], false); |
| 58 | TestForwarding(handler, |
| 59 | (o, p) => Reflect.deleteProperty(o, p), false); |
| 60 | TestForwarding(handler, |
| 61 | (o, p) => {"use strict"; return delete o[p]}, true); |
| 62 | TestForwarding(handler, |
| 63 | (o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}, false); |
| 64 | })(); |
| 65 | |
| 66 | |
| 67 | (function () { |
| 68 | // Invalid trap. |
| 69 | |
| 70 | var target = {}; |
| 71 | var handler = { deleteProperty: true }; |
| 72 | var proxy = new Proxy(target, handler); |
| 73 | |
| 74 | assertThrows(() => delete proxy[0], TypeError); |
| 75 | assertThrows(() => Reflect.deleteProperty(proxy, 0), TypeError); |
| 76 | })(); |
| 77 | |
| 78 | |
| 79 | function TestTrappingTrueish(myDelete) { |
| 80 | var handler = { deleteProperty() {return 42} }; |
| 81 | var target = {}; |
| 82 | var proxy = new Proxy(target, handler); |
| 83 | |
| 84 | // Trap returns trueish and target doesn't own property. |
| 85 | for (p of properties) { |
| 86 | assertTrue(myDelete(proxy, p)); |
| 87 | } |
| 88 | |
| 89 | // Trap returns trueish and target property is configurable. |
| 90 | for (p of properties) { |
| 91 | target[p] = 42; |
| 92 | assertTrue(myDelete(proxy, p)); |
| 93 | } |
| 94 | |
| 95 | // Trap returns trueish but target property is not configurable. |
| 96 | for (p of properties) { |
| 97 | Object.defineProperty(target, p, {value: 42, configurable: false}); |
| 98 | assertThrows(() => myDelete(proxy, p), TypeError); |
| 99 | } |
| 100 | }; |
| 101 | |
| 102 | |
| 103 | TestTrappingTrueish( |
| 104 | (o, p) => delete o[p]); |
| 105 | TestTrappingTrueish( |
| 106 | (o, p) => Reflect.deleteProperty(o, p)); |
| 107 | TestTrappingTrueish( |
| 108 | (o, p) => {"use strict"; return delete o[p]}); |
| 109 | TestTrappingTrueish( |
| 110 | (o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}); |
| 111 | |
| 112 | |
| 113 | function TestTrappingTrueish2(myDelete) { |
| 114 | var handler = { |
| 115 | deleteProperty(target, p) { |
| 116 | Object.defineProperty(target, p, {configurable: false}); |
| 117 | return 42 |
| 118 | } |
| 119 | }; |
| 120 | var target = {}; |
| 121 | var proxy = new Proxy(target, handler); |
| 122 | |
| 123 | // Trap returns trueish but target property is not configurable. In contrast |
| 124 | // to above, here the target property was configurable before the trap call. |
| 125 | for (p of properties) { |
| 126 | target[p] = 42; |
| 127 | assertThrows(() => myDelete(proxy, p), TypeError); |
| 128 | } |
| 129 | }; |
| 130 | |
| 131 | |
| 132 | TestTrappingTrueish2( |
| 133 | (o, p) => delete o[p]); |
| 134 | TestTrappingTrueish2( |
| 135 | (o, p) => Reflect.deleteProperty(o, p)); |
| 136 | TestTrappingTrueish2( |
| 137 | (o, p) => {"use strict"; return delete o[p]}); |
| 138 | TestTrappingTrueish2( |
| 139 | (o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}); |
| 140 | |
| 141 | |
| 142 | function TestTrappingFalsish(myDelete, shouldThrow) { |
| 143 | var handler = { deleteProperty() {return ""} }; |
| 144 | var target = {}; |
| 145 | var proxy = new Proxy(target, handler); |
| 146 | |
| 147 | var properties = |
| 148 | ["bla", "0", 1, Symbol(), {[Symbol.toPrimitive]() {return "a"}}]; |
| 149 | |
| 150 | // Trap returns falsish and target doesn't own property. |
| 151 | for (p of properties) { |
| 152 | if (shouldThrow) { |
| 153 | assertThrows(() => myDelete(proxy, p), TypeError); |
| 154 | } else { |
| 155 | assertFalse(myDelete(proxy, p)); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | // Trap returns falsish and target property is configurable. |
| 160 | for (p of properties) { |
| 161 | target[p] = 42; |
| 162 | if (shouldThrow) { |
| 163 | assertThrows(() => myDelete(proxy, p), TypeError); |
| 164 | } else { |
| 165 | assertFalse(myDelete(proxy, p)); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | // Trap returns falsish and target property is not configurable. |
| 170 | for (p of properties) { |
| 171 | Object.defineProperty(target, p, {value: 42, configurable: false}); |
| 172 | if (shouldThrow) { |
| 173 | assertThrows(() => myDelete(proxy, p), TypeError); |
| 174 | } else { |
| 175 | assertFalse(myDelete(proxy, p)); |
| 176 | } |
| 177 | } |
| 178 | }; |
| 179 | |
| 180 | |
| 181 | TestTrappingFalsish( |
| 182 | (o, p) => delete o[p], false); |
| 183 | TestTrappingFalsish( |
| 184 | (o, p) => Reflect.deleteProperty(o, p), false); |
| 185 | TestTrappingFalsish( |
| 186 | (o, p) => {"use strict"; return delete o[p]}, true); |
| 187 | TestTrappingFalsish( |
| 188 | (o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}, false); |