Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 28 | |
| 29 | |
| 30 | /////////////////////////////////////////////////////////////////////////////// |
| 31 | // JSON.stringify |
| 32 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 33 | |
| 34 | function testStringify(expected, object) { |
| 35 | // Test fast case that bails out to slow case. |
| 36 | assertEquals(expected, JSON.stringify(object)); |
| 37 | // Test slow case. |
| 38 | assertEquals(expected, JSON.stringify(object, undefined, 0)); |
| 39 | } |
| 40 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 41 | |
| 42 | // Test serializing a proxy, a function proxy, and objects that contain them. |
| 43 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 44 | var handler1 = { |
| 45 | get: function(target, name) { |
| 46 | return name.toUpperCase(); |
| 47 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 48 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 49 | return ['a', 'b', 'c']; |
| 50 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 51 | getOwnPropertyDescriptor: function() { |
| 52 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 53 | } |
| 54 | } |
| 55 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 56 | var proxy1 = new Proxy({}, handler1); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 57 | testStringify('{"a":"A","b":"B","c":"C"}', proxy1); |
| 58 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 59 | var proxy_fun = new Proxy(() => {}, handler1); |
| 60 | assertTrue(typeof(proxy_fun) === 'function'); |
| 61 | testStringify(undefined, proxy_fun); |
| 62 | testStringify('[1,null]', [1, proxy_fun]); |
| 63 | |
| 64 | handler1.apply = function() { return 666; }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 65 | testStringify(undefined, proxy_fun); |
| 66 | testStringify('[1,null]', [1, proxy_fun]); |
| 67 | |
| 68 | var parent1a = { b: proxy1 }; |
| 69 | testStringify('{"b":{"a":"A","b":"B","c":"C"}}', parent1a); |
| 70 | |
| 71 | var parent1b = { a: 123, b: proxy1, c: true }; |
| 72 | testStringify('{"a":123,"b":{"a":"A","b":"B","c":"C"},"c":true}', parent1b); |
| 73 | |
| 74 | var parent1c = [123, proxy1, true]; |
| 75 | testStringify('[123,{"a":"A","b":"B","c":"C"},true]', parent1c); |
| 76 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 77 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 78 | // Proxy with side effect. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 79 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 80 | var handler2 = { |
| 81 | get: function(target, name) { |
| 82 | delete parent2.c; |
| 83 | return name.toUpperCase(); |
| 84 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 85 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 86 | return ['a', 'b', 'c']; |
| 87 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 88 | getOwnPropertyDescriptor: function() { |
| 89 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 90 | } |
| 91 | } |
| 92 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 93 | var proxy2 = new Proxy({}, handler2); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 94 | var parent2 = { a: "delete", b: proxy2, c: "remove" }; |
| 95 | var expected2 = '{"a":"delete","b":{"a":"A","b":"B","c":"C"}}'; |
| 96 | assertEquals(expected2, JSON.stringify(parent2)); |
| 97 | parent2.c = "remove"; // Revert side effect. |
| 98 | assertEquals(expected2, JSON.stringify(parent2, undefined, 0)); |
| 99 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 100 | |
| 101 | // Proxy with a get function that uses the receiver argument. |
| 102 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 103 | var handler3 = { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 104 | get: function(target, name, receiver) { |
| 105 | if (name == 'valueOf' || name === Symbol.toPrimitive) { |
| 106 | return function() { return "proxy" }; |
| 107 | }; |
| 108 | if (typeof name !== 'symbol') return name + "(" + receiver + ")"; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 109 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 110 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 111 | return ['a', 'b', 'c']; |
| 112 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 113 | getOwnPropertyDescriptor: function() { |
| 114 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 115 | } |
| 116 | } |
| 117 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 118 | var proxy3 = new Proxy({}, handler3); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 119 | var parent3 = { x: 123, y: proxy3 } |
| 120 | testStringify('{"x":123,"y":{"a":"a(proxy)","b":"b(proxy)","c":"c(proxy)"}}', |
| 121 | parent3); |
| 122 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 123 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 124 | // Empty proxy. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 125 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 126 | var handler4 = { |
| 127 | get: function(target, name) { |
| 128 | return 0; |
| 129 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 130 | has: function() { |
| 131 | return true; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 132 | }, |
| 133 | getOwnPropertyDescriptor: function(target, name) { |
| 134 | return { enumerable: false }; |
| 135 | } |
| 136 | } |
| 137 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 138 | var proxy4 = new Proxy({}, handler4); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 139 | testStringify('{}', proxy4); |
| 140 | testStringify('{"a":{}}', { a: proxy4 }); |
| 141 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 142 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 143 | // Proxy that provides a toJSON function that uses this. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 144 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 145 | var handler5 = { |
| 146 | get: function(target, name) { |
| 147 | if (name == 'z') return 97000; |
| 148 | return function(key) { return key.charCodeAt(0) + this.z; }; |
| 149 | }, |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 150 | ownKeys: function(target) { |
| 151 | return ['toJSON', 'z']; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 152 | }, |
| 153 | has: function() { |
| 154 | return true; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 155 | }, |
| 156 | getOwnPropertyDescriptor: function(target, name) { |
| 157 | return { enumerable: true }; |
| 158 | } |
| 159 | } |
| 160 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 161 | var proxy5 = new Proxy({}, handler5); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 162 | testStringify('{"a":97097}', { a: proxy5 }); |
| 163 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 164 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 165 | // Proxy that provides a toJSON function that returns undefined. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 166 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 167 | var handler6 = { |
| 168 | get: function(target, name) { |
| 169 | return function(key) { return undefined; }; |
| 170 | }, |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 171 | ownKeys: function(target) { |
| 172 | return ['toJSON']; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 173 | }, |
| 174 | has: function() { |
| 175 | return true; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 176 | }, |
| 177 | getOwnPropertyDescriptor: function(target, name) { |
| 178 | return { enumerable: true }; |
| 179 | } |
| 180 | } |
| 181 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 182 | var proxy6 = new Proxy({}, handler6); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 183 | testStringify('[1,null,true]', [1, proxy6, true]); |
| 184 | testStringify('{"a":1,"c":true}', {a: 1, b: proxy6, c: true}); |
| 185 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 186 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 187 | // Object containing a proxy that changes the parent's properties. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 188 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 189 | var handler7 = { |
| 190 | get: function(target, name) { |
| 191 | delete parent7.a; |
| 192 | delete parent7.c; |
| 193 | parent7.e = "5"; |
| 194 | return name.toUpperCase(); |
| 195 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 196 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 197 | return ['a', 'b', 'c']; |
| 198 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 199 | getOwnPropertyDescriptor: function() { |
| 200 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 201 | } |
| 202 | } |
| 203 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 204 | var proxy7 = new Proxy({}, handler7); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 205 | var parent7 = { a: "1", b: proxy7, c: "3", d: "4" }; |
| 206 | assertEquals('{"a":"1","b":{"a":"A","b":"B","c":"C"},"d":"4"}', |
| 207 | JSON.stringify(parent7)); |
| 208 | assertEquals('{"b":{"a":"A","b":"B","c":"C"},"d":"4","e":"5"}', |
| 209 | JSON.stringify(parent7)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 210 | |
| 211 | |
| 212 | // (Proxy handler to log trap calls) |
| 213 | |
| 214 | var log = []; |
| 215 | var logger = {}; |
| 216 | var handler = new Proxy({}, logger); |
| 217 | |
| 218 | logger.get = function(t, trap, r) { |
| 219 | return function() { |
| 220 | log.push([trap, ...arguments]); |
| 221 | return Reflect[trap](...arguments); |
| 222 | } |
| 223 | }; |
| 224 | |
| 225 | |
| 226 | // Object is a callable proxy |
| 227 | |
| 228 | log.length = 0; |
| 229 | var target = () => 42; |
| 230 | var proxy = new Proxy(target, handler); |
| 231 | assertTrue(typeof proxy === 'function'); |
| 232 | |
| 233 | assertEquals(undefined, JSON.stringify(proxy)); |
| 234 | assertEquals(1, log.length) |
| 235 | for (var i in log) assertSame(target, log[i][1]); |
| 236 | |
| 237 | assertEquals(["get", target, "toJSON", proxy], log[0]); |
| 238 | |
| 239 | |
| 240 | // Object is a non-callable non-arraylike proxy |
| 241 | |
| 242 | log.length = 0; |
| 243 | var target = {foo: 42} |
| 244 | var proxy = new Proxy(target, handler); |
| 245 | assertFalse(Array.isArray(proxy)); |
| 246 | |
| 247 | assertEquals('{"foo":42}', JSON.stringify(proxy)); |
| 248 | assertEquals(4, log.length) |
| 249 | for (var i in log) assertSame(target, log[i][1]); |
| 250 | |
| 251 | assertEquals( |
| 252 | ["get", target, "toJSON", proxy], log[0]); |
| 253 | assertEquals( |
| 254 | ["ownKeys", target], log[1]); // EnumerableOwnNames |
| 255 | assertEquals( |
| 256 | ["getOwnPropertyDescriptor", target, "foo"], log[2]); // EnumerableOwnNames |
| 257 | assertEquals( |
| 258 | ["get", target, "foo", proxy], log[3]); |
| 259 | |
| 260 | |
| 261 | // Object is an arraylike proxy |
| 262 | |
| 263 | log.length = 0; |
| 264 | var target = [42]; |
| 265 | var proxy = new Proxy(target, handler); |
| 266 | assertTrue(Array.isArray(proxy)); |
| 267 | |
| 268 | assertEquals('[42]', JSON.stringify(proxy)); |
| 269 | assertEquals(3, log.length) |
| 270 | for (var i in log) assertSame(target, log[i][1]); |
| 271 | |
| 272 | assertEquals(["get", target, "toJSON", proxy], log[0]); |
| 273 | assertEquals(["get", target, "length", proxy], log[1]); |
| 274 | assertEquals(["get", target, "0", proxy], log[2]); |
| 275 | |
| 276 | |
| 277 | // Replacer is a callable proxy |
| 278 | |
| 279 | log.length = 0; |
| 280 | var object = {0: "foo", 1: 666}; |
| 281 | var target = (key, val) => key == "1" ? val + 42 : val; |
| 282 | var proxy = new Proxy(target, handler); |
| 283 | assertTrue(typeof proxy === 'function'); |
| 284 | |
| 285 | assertEquals('{"0":"foo","1":708}', JSON.stringify(object, proxy)); |
| 286 | assertEquals(3, log.length) |
| 287 | for (var i in log) assertSame(target, log[i][1]); |
| 288 | |
| 289 | assertEquals(4, log[0].length) |
| 290 | assertEquals("apply", log[0][0]); |
| 291 | assertEquals("", log[0][3][0]); |
| 292 | assertEquals({0: "foo", 1: 666}, log[0][3][1]); |
| 293 | assertEquals(4, log[1].length) |
| 294 | assertEquals("apply", log[1][0]); |
| 295 | assertEquals(["0", "foo"], log[1][3]); |
| 296 | assertEquals(4, log[2].length) |
| 297 | assertEquals("apply", log[2][0]); |
| 298 | assertEquals(["1", 666], log[2][3]); |
| 299 | |
| 300 | |
| 301 | // Replacer is an arraylike proxy |
| 302 | |
| 303 | log.length = 0; |
| 304 | var object = {0: "foo", 1: 666}; |
| 305 | var target = [0]; |
| 306 | var proxy = new Proxy(target, handler); |
| 307 | assertTrue(Array.isArray(proxy)); |
| 308 | |
| 309 | assertEquals('{"0":"foo"}', JSON.stringify(object, proxy)); |
| 310 | assertEquals(2, log.length) |
| 311 | for (var i in log) assertSame(target, log[i][1]); |
| 312 | |
| 313 | assertEquals(["get", target, "length", proxy], log[0]); |
| 314 | assertEquals(["get", target, "0", proxy], log[1]); |
| 315 | |
| 316 | |
| 317 | // Replacer is an arraylike proxy and object is an array |
| 318 | |
| 319 | log.length = 0; |
| 320 | var object = ["foo", 42]; |
| 321 | var target = [0]; |
| 322 | var proxy = new Proxy(target, handler); |
| 323 | assertTrue(Array.isArray(proxy)); |
| 324 | |
| 325 | assertEquals('["foo",42]', JSON.stringify(object, proxy)); |
| 326 | assertEquals(2, log.length); |
| 327 | for (var i in log) assertSame(target, log[i][1]); |
| 328 | |
| 329 | assertEquals(["get", target, "length", proxy], log[0]); |
| 330 | assertEquals(["get", target, "0", proxy], log[1]); |
| 331 | |
| 332 | |
| 333 | // Replacer is an arraylike proxy with a non-trivial length |
| 334 | |
| 335 | var getTrap = function(t, key) { |
| 336 | if (key === "length") return {[Symbol.toPrimitive]() {return 42}}; |
| 337 | if (key === "41") return "foo"; |
| 338 | if (key === "42") return "bar"; |
| 339 | }; |
| 340 | var target = []; |
| 341 | var proxy = new Proxy(target, {get: getTrap}); |
| 342 | assertTrue(Array.isArray(proxy)); |
| 343 | var object = {foo: true, bar: 666}; |
| 344 | assertEquals('{"foo":true}', JSON.stringify(object, proxy)); |
| 345 | |
| 346 | |
| 347 | // Replacer is an arraylike proxy with a bogus length |
| 348 | |
| 349 | var getTrap = function(t, key) { |
| 350 | if (key === "length") return Symbol(); |
| 351 | if (key === "41") return "foo"; |
| 352 | if (key === "42") return "bar"; |
| 353 | }; |
| 354 | var target = []; |
| 355 | var proxy = new Proxy(target, {get: getTrap}); |
| 356 | assertTrue(Array.isArray(proxy)); |
| 357 | var object = {foo: true, bar: 666}; |
| 358 | assertThrows(() => JSON.stringify(object, proxy), TypeError); |
| 359 | |
| 360 | |
| 361 | // Replacer returns a non-callable non-arraylike proxy |
| 362 | |
| 363 | log.length = 0; |
| 364 | var object = ["foo", 42]; |
| 365 | var target = {baz: 5}; |
| 366 | var proxy = new Proxy(target, handler); |
| 367 | var replacer = (key, val) => key === "1" ? proxy : val; |
| 368 | |
| 369 | assertEquals('["foo",{"baz":5}]', JSON.stringify(object, replacer)); |
| 370 | assertEquals(3, log.length); |
| 371 | for (var i in log) assertSame(target, log[i][1]); |
| 372 | |
| 373 | assertEquals(["ownKeys", target], log[0]); |
| 374 | assertEquals(["getOwnPropertyDescriptor", target, "baz"], log[1]); |
| 375 | |
| 376 | |
| 377 | // Replacer returns an arraylike proxy |
| 378 | |
| 379 | log.length = 0; |
| 380 | var object = ["foo", 42]; |
| 381 | var target = ["bar"]; |
| 382 | var proxy = new Proxy(target, handler); |
| 383 | var replacer = (key, val) => key === "1" ? proxy : val; |
| 384 | |
| 385 | assertEquals('["foo",["bar"]]', JSON.stringify(object, replacer)); |
| 386 | assertEquals(2, log.length); |
| 387 | for (var i in log) assertSame(target, log[i][1]); |
| 388 | |
| 389 | assertEquals(["get", target, "length", proxy], log[0]); |
| 390 | assertEquals(["get", target, "0", proxy], log[1]); |
| 391 | |
| 392 | |
| 393 | // Replacer returns an arraylike proxy with a non-trivial length |
| 394 | |
| 395 | var getTrap = function(t, key) { |
| 396 | if (key === "length") return {[Symbol.toPrimitive]() {return 3}}; |
| 397 | if (key === "2") return "baz"; |
| 398 | if (key === "3") return "bar"; |
| 399 | }; |
| 400 | var target = []; |
| 401 | var proxy = new Proxy(target, {get: getTrap}); |
| 402 | var replacer = (key, val) => key === "goo" ? proxy : val; |
| 403 | var object = {foo: true, goo: false}; |
| 404 | assertEquals('{"foo":true,"goo":[null,null,"baz"]}', |
| 405 | JSON.stringify(object, replacer)); |
| 406 | |
| 407 | |
| 408 | // Replacer returns an arraylike proxy with a bogus length |
| 409 | |
| 410 | var getTrap = function(t, key) { |
| 411 | if (key === "length") return Symbol(); |
| 412 | if (key === "2") return "baz"; |
| 413 | if (key === "3") return "bar"; |
| 414 | }; |
| 415 | var target = []; |
| 416 | var proxy = new Proxy(target, {get: getTrap}); |
| 417 | var replacer = (key, val) => key === "goo" ? proxy : val; |
| 418 | var object = {foo: true, goo: false}; |
| 419 | assertThrows(() => JSON.stringify(object, replacer), TypeError); |
| 420 | |
| 421 | |
| 422 | // Replacer returns a callable proxy |
| 423 | |
| 424 | log.length = 0; |
| 425 | var target = () => 666; |
| 426 | var proxy = new Proxy(target, handler); |
| 427 | var replacer = (key, val) => key === "1" ? proxy : val; |
| 428 | |
| 429 | assertEquals('["foo",null]', JSON.stringify(["foo", 42], replacer)); |
| 430 | assertEquals(0, log.length); |
| 431 | |
| 432 | assertEquals('{"0":"foo"}', JSON.stringify({0: "foo", 1: 42}, replacer)); |
| 433 | assertEquals(0, log.length); |
| 434 | |
| 435 | |
| 436 | |
| 437 | /////////////////////////////////////////////////////////////////////////////// |
| 438 | // JSON.parse |
| 439 | |
| 440 | |
| 441 | // Reviver is a callable proxy |
| 442 | |
| 443 | log.length = 0; |
| 444 | var target = () => 42; |
| 445 | var proxy = new Proxy(target, handler); |
| 446 | assertTrue(typeof proxy === "function"); |
| 447 | |
| 448 | assertEquals(42, JSON.parse("[true, false]", proxy)); |
| 449 | assertEquals(3, log.length); |
| 450 | for (var i in log) assertSame(target, log[i][1]); |
| 451 | |
| 452 | assertEquals(4, log[0].length); |
| 453 | assertEquals("apply", log[0][0]); |
| 454 | assertEquals(["0", true], log[0][3]); |
| 455 | assertEquals(4, log[1].length); |
| 456 | assertEquals("apply", log[1][0]); |
| 457 | assertEquals(["1", false], log[1][3]); |
| 458 | assertEquals(4, log[2].length); |
| 459 | assertEquals("apply", log[2][0]); |
| 460 | assertEquals(["", [42, 42]], log[2][3]); |
| 461 | |
| 462 | |
| 463 | // Reviver plants a non-arraylike proxy into a yet-to-be-visited property |
| 464 | |
| 465 | log.length = 0; |
| 466 | var target = {baz: 42}; |
| 467 | var proxy = new Proxy(target, handler); |
| 468 | var reviver = function(p, v) { |
| 469 | if (p === "baz") return 5; |
| 470 | if (p === "foo") this.bar = proxy; |
| 471 | return v; |
| 472 | } |
| 473 | |
| 474 | assertEquals({foo: 0, bar: proxy}, JSON.parse('{"foo":0,"bar":1}', reviver)); |
| 475 | assertEquals(4, log.length); |
| 476 | for (var i in log) assertSame(target, log[i][1]); |
| 477 | |
| 478 | assertEquals(["ownKeys", target], log[0]); |
| 479 | assertEquals(["getOwnPropertyDescriptor", target, "baz"], log[1]); |
| 480 | assertEquals(["get", target, "baz", proxy], log[2]); |
| 481 | assertEquals(["defineProperty", target, "baz", |
| 482 | {value: 5, configurable: true, writable: true, enumerable: true}], log[3]); |
| 483 | |
| 484 | |
| 485 | // Reviver plants an arraylike proxy into a yet-to-be-visited property |
| 486 | |
| 487 | log.length = 0; |
| 488 | var target = [42]; |
| 489 | var proxy = new Proxy(target, handler); |
| 490 | assertTrue(Array.isArray(proxy)); |
| 491 | var reviver = function(p, v) { |
| 492 | if (p === "0") return undefined; |
| 493 | if (p === "foo") this.bar = proxy; |
| 494 | return v; |
| 495 | } |
| 496 | |
| 497 | var result = JSON.parse('{"foo":0,"bar":1}', reviver); |
| 498 | assertEquals({foo: 0, bar: proxy}, result); |
| 499 | assertSame(result.bar, proxy); |
| 500 | assertEquals(3, log.length); |
| 501 | for (var i in log) assertSame(target, log[i][1]); |
| 502 | |
| 503 | assertEquals(["get", target, "length", proxy], log[0]); |
| 504 | assertEquals(["get", target, "0", proxy], log[1]); |
| 505 | assertEquals(["deleteProperty", target, "0"], log[2]); |