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 | function sloppyDefaultSet(o, p, v) { return o[p] = v } |
| 7 | function sloppyReflectSet(o, p, v) { return Reflect.set(o, p, v) } |
| 8 | function strictDefaultSet(o, p, v) { "use strict"; return o[p] = v } |
| 9 | function strictReflectSet(o, p, v) { "use strict"; return Reflect.set(o, p, v) } |
| 10 | |
| 11 | sloppyDefaultSet.shouldThrow = false; |
| 12 | sloppyReflectSet.shouldThrow = false; |
| 13 | strictDefaultSet.shouldThrow = true; |
| 14 | strictReflectSet.shouldThrow = false; |
| 15 | |
| 16 | sloppyDefaultSet.returnsBool = false; |
| 17 | sloppyReflectSet.returnsBool = true; |
| 18 | strictDefaultSet.returnsBool = false; |
| 19 | strictReflectSet.returnsBool = true; |
| 20 | |
| 21 | |
| 22 | function assertTrueIf(flag, x) { if (flag) assertTrue(x) } |
| 23 | function assertFalseIf(flag, x) { if (flag) assertFalse(x) } |
| 24 | function assertSetFails(mySet, o, p, v) { |
| 25 | if (mySet.shouldThrow) { |
| 26 | assertThrows(() => mySet(o, p, v), TypeError); |
| 27 | } else { |
| 28 | assertFalseIf(mySet.returnsBool, mySet(o, p, v)); |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | |
| 33 | function dataDescriptor(x) { |
| 34 | return {value: x, writable: true, enumerable: true, configurable: true}; |
| 35 | } |
| 36 | |
| 37 | |
| 38 | function toKey(x) { |
| 39 | if (typeof x === "symbol") return x; |
| 40 | return String(x); |
| 41 | } |
| 42 | |
| 43 | |
| 44 | var properties = |
| 45 | ["bla", "0", 1, Symbol(), {[Symbol.toPrimitive]() {return "a"}}]; |
| 46 | |
| 47 | |
| 48 | function TestForwarding(handler, mySet) { |
| 49 | assertTrue(undefined == handler.set); |
| 50 | assertTrue(undefined == handler.getOwnPropertyDescriptor); |
| 51 | assertTrue(undefined == handler.defineProperty); |
| 52 | |
| 53 | var target = {}; |
| 54 | var proxy = new Proxy(target, handler); |
| 55 | |
| 56 | // Property does not exist on target. |
| 57 | for (var p of properties) { |
| 58 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 42)); |
| 59 | assertSame(42, target[p]); |
| 60 | } |
| 61 | |
| 62 | // Property exists as writable data on target. |
| 63 | for (var p of properties) { |
| 64 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); |
| 65 | assertSame(0, target[p]); |
| 66 | } |
| 67 | |
| 68 | // Property exists as non-writable data on target. |
| 69 | for (var p of properties) { |
| 70 | Object.defineProperty(target, p, |
| 71 | {value: 42, configurable: true, writable: false}); |
| 72 | assertSetFails(mySet, proxy, p, 42); |
| 73 | assertSetFails(mySet, proxy, p, 0); |
| 74 | assertEquals(42, target[p]); |
| 75 | } |
| 76 | }; |
| 77 | |
| 78 | (function () { |
| 79 | // No trap. |
| 80 | var handler = {}; |
| 81 | TestForwarding(handler, sloppyDefaultSet); |
| 82 | TestForwarding(handler, sloppyReflectSet); |
| 83 | TestForwarding(handler, strictDefaultSet); |
| 84 | TestForwarding(handler, strictReflectSet); |
| 85 | })(); |
| 86 | |
| 87 | (function () { |
| 88 | // "Undefined" trap. |
| 89 | var handler = { set: null }; |
| 90 | TestForwarding(handler, sloppyDefaultSet); |
| 91 | TestForwarding(handler, sloppyReflectSet); |
| 92 | TestForwarding(handler, strictDefaultSet); |
| 93 | TestForwarding(handler, strictReflectSet); |
| 94 | })(); |
| 95 | |
| 96 | |
| 97 | function TestForwarding2(mySet) { |
| 98 | // Check that setting on a proxy without "set" trap correctly triggers its |
| 99 | // "getOwnProperty" trap and its "defineProperty" trap. |
| 100 | |
| 101 | var target = {}; |
| 102 | var handler = {}; |
| 103 | var observations = []; |
| 104 | var proxy = new Proxy(target, handler); |
| 105 | |
| 106 | handler.getOwnPropertyDescriptor = function() { |
| 107 | observations.push(arguments); |
| 108 | return Reflect.getOwnPropertyDescriptor(...arguments); |
| 109 | } |
| 110 | |
| 111 | handler.defineProperty = function() { |
| 112 | observations.push(arguments); |
| 113 | return Reflect.defineProperty(...arguments); |
| 114 | } |
| 115 | |
| 116 | for (var p of properties) { |
| 117 | mySet(proxy, p, 42); |
| 118 | assertEquals(2, observations.length) |
| 119 | assertArrayEquals([target, toKey(p)], observations[0]); |
| 120 | assertSame(target, observations[0][0]); |
| 121 | assertArrayEquals([target, toKey(p), dataDescriptor(42)], observations[1]); |
| 122 | assertSame(target, observations[1][0]); |
| 123 | observations = []; |
| 124 | |
| 125 | mySet(proxy, p, 42); |
| 126 | assertEquals(2, observations.length) |
| 127 | assertArrayEquals([target, toKey(p)], observations[0]); |
| 128 | assertSame(target, observations[0][0]); |
| 129 | assertArrayEquals([target, toKey(p), {value: 42}], observations[1]); |
| 130 | assertSame(target, observations[1][0]); |
| 131 | observations = []; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | TestForwarding2(sloppyDefaultSet); |
| 136 | TestForwarding2(sloppyReflectSet); |
| 137 | TestForwarding2(strictDefaultSet); |
| 138 | TestForwarding2(strictReflectSet); |
| 139 | |
| 140 | |
| 141 | function TestInvalidTrap(proxy, mySet) { |
| 142 | for (var p of properties) { |
| 143 | assertThrows(() => mySet(proxy, p, 42), TypeError); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | (function () { |
| 148 | var target = {}; |
| 149 | var handler = { set: true }; |
| 150 | var proxy = new Proxy(target, handler); |
| 151 | |
| 152 | TestInvalidTrap(proxy, sloppyDefaultSet); |
| 153 | TestInvalidTrap(proxy, sloppyReflectSet); |
| 154 | TestInvalidTrap(proxy, strictDefaultSet); |
| 155 | TestInvalidTrap(proxy, strictReflectSet); |
| 156 | })(); |
| 157 | |
| 158 | |
| 159 | function TestTrappingFalsish(mySet) { |
| 160 | var target = {}; |
| 161 | var handler = { set() {return ""} }; |
| 162 | var proxy = new Proxy(target, handler); |
| 163 | |
| 164 | for (var p of properties) { |
| 165 | assertSetFails(mySet, proxy, p, 42); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | TestTrappingFalsish(sloppyDefaultSet); |
| 170 | TestTrappingFalsish(sloppyReflectSet); |
| 171 | TestTrappingFalsish(strictDefaultSet); |
| 172 | TestTrappingFalsish(strictReflectSet); |
| 173 | |
| 174 | |
| 175 | function TestTrappingTrueish(mySet) { |
| 176 | var target = {}; |
| 177 | var handler = { set() {return 42} }; |
| 178 | var proxy = new Proxy(target, handler); |
| 179 | |
| 180 | // Trap returns trueish and property does not exist in target. |
| 181 | for (var p of properties) { |
| 182 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); |
| 183 | } |
| 184 | |
| 185 | // Trap returns trueish and target property is configurable or writable data. |
| 186 | for (var p of properties) { |
| 187 | Object.defineProperty(target, p, {configurable: true, writable: true}); |
| 188 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); |
| 189 | Object.defineProperty(target, p, {configurable: true, writable: false}); |
| 190 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); |
| 191 | Object.defineProperty(target, p, {configurable: false, writable: true}); |
| 192 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | TestTrappingTrueish(sloppyDefaultSet); |
| 197 | TestTrappingTrueish(sloppyReflectSet); |
| 198 | TestTrappingTrueish(strictDefaultSet); |
| 199 | TestTrappingTrueish(strictReflectSet); |
| 200 | |
| 201 | |
| 202 | function TestTrappingTrueish2(mySet) { |
| 203 | var target = {}; |
| 204 | var handler = { set() {return 42} }; |
| 205 | var proxy = new Proxy(target, handler); |
| 206 | |
| 207 | // Trap returns trueish but target property is frozen data. |
| 208 | for (var p of properties) { |
| 209 | Object.defineProperty(target, p, { |
| 210 | configurable: false, writable: false, value: 0 |
| 211 | }); |
| 212 | assertThrows(() => mySet(proxy, p, 666), TypeError); // New value. |
| 213 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); // Old value. |
| 214 | } |
| 215 | }; |
| 216 | |
| 217 | TestTrappingTrueish2(sloppyDefaultSet); |
| 218 | TestTrappingTrueish2(sloppyReflectSet); |
| 219 | TestTrappingTrueish2(strictDefaultSet); |
| 220 | TestTrappingTrueish2(strictReflectSet); |
| 221 | |
| 222 | |
| 223 | function TestTrappingTrueish3(mySet) { |
| 224 | var target = {}; |
| 225 | var handler = { set() {return 42} }; |
| 226 | var proxy = new Proxy(target, handler); |
| 227 | |
| 228 | // Trap returns trueish and target property is configurable accessor. |
| 229 | for (var p of properties) { |
| 230 | Object.defineProperty(target, p, { configurable: true, set: undefined }); |
| 231 | assertTrueIf(mySet.returnsBool, mySet(proxy, p, 0)); |
| 232 | } |
| 233 | |
| 234 | // Trap returns trueish and target property is non-configurable accessor. |
| 235 | for (var p of properties) { |
| 236 | Object.defineProperty(target, p, { configurable: false, set: undefined }); |
| 237 | assertThrows(() => mySet(proxy, p, 0)); |
| 238 | } |
| 239 | }; |
| 240 | |
| 241 | TestTrappingTrueish3(sloppyDefaultSet); |
| 242 | TestTrappingTrueish3(sloppyReflectSet); |
| 243 | TestTrappingTrueish3(strictDefaultSet); |
| 244 | TestTrappingTrueish3(strictReflectSet); |
| 245 | |
| 246 | |
| 247 | function TestTrapReceiverArgument(mySet) { |
| 248 | var target = {}; |
| 249 | var handler = {}; |
| 250 | var observations = []; |
| 251 | var proxy = new Proxy(target, handler); |
| 252 | var object = Object.create(proxy); |
| 253 | |
| 254 | handler.set = function() { |
| 255 | observations.push(arguments); |
| 256 | return Reflect.set(...arguments); |
| 257 | } |
| 258 | |
| 259 | for (var p of properties) { |
| 260 | mySet(object, p, 42); |
| 261 | assertEquals(1, observations.length) |
| 262 | assertArrayEquals([target, toKey(p), 42, object], observations[0]); |
| 263 | assertSame(target, observations[0][0]); |
| 264 | assertSame(object, observations[0][3]); |
| 265 | observations = []; |
| 266 | } |
| 267 | }; |
| 268 | |
| 269 | TestTrapReceiverArgument(sloppyDefaultSet); |
| 270 | TestTrapReceiverArgument(sloppyReflectSet); |
| 271 | TestTrapReceiverArgument(strictDefaultSet); |
| 272 | TestTrapReceiverArgument(strictReflectSet); |
| 273 | |
| 274 | |
| 275 | (function TestTrapReceiverArgument2() { |
| 276 | // Check that non-object receiver is passed through as well. |
| 277 | |
| 278 | var target = {}; |
| 279 | var handler = {}; |
| 280 | var observations = []; |
| 281 | var proxy = new Proxy(target, handler); |
| 282 | |
| 283 | handler.set = function() { |
| 284 | observations.push(arguments); |
| 285 | return Reflect.set(...arguments); |
| 286 | } |
| 287 | |
| 288 | for (var p of properties) { |
| 289 | for (var receiver of [null, undefined, 1]) { |
| 290 | Reflect.set(proxy, p, 42, receiver); |
| 291 | assertEquals(1, observations.length) |
| 292 | assertArrayEquals([target, toKey(p), 42, receiver], observations[0]); |
| 293 | assertSame(target, observations[0][0]); |
| 294 | assertSame(receiver, observations[0][3]); |
| 295 | observations = []; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | var object = Object.create(proxy); |
| 300 | for (var p of properties) { |
| 301 | for (var receiver of [null, undefined, 1]) { |
| 302 | Reflect.set(object, p, 42, receiver); |
| 303 | assertEquals(1, observations.length); |
| 304 | assertArrayEquals([target, toKey(p), 42, receiver], observations[0]); |
| 305 | assertSame(target, observations[0][0]); |
| 306 | assertSame(receiver, observations[0][3]); |
| 307 | observations = []; |
| 308 | } |
| 309 | } |
| 310 | })(); |