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* Copyright (c) 2017-present, Facebook, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the BSD-style license found in the\n * LICENSE file in the root directory of this source tree. An additional grant\n * of patent rights can be found in the PATENTS file in the same directory.\n */\n\n/* @flow */\n\nimport { Realm } from \"../realm.js\";\nimport {\n Value,\n AbstractObjectValue,\n SymbolValue,\n NullValue,\n ObjectValue,\n UndefinedValue,\n StringValue,\n} from \"./index.js\";\nimport type { Descriptor, PropertyKeyValue } from \"../types.js\";\nimport invariant from \"../invariant.js\";\nimport { SameValuePartial, SamePropertyKey } from \"../methods/abstract.js\";\nimport { GetMethod } from \"../methods/get.js\";\nimport { IsExtensible, IsPropertyKey, IsDataDescriptor, IsAccessorDescriptor } from \"../methods/is.js\";\nimport { Create, Properties, To } from \"../singletons.js\";\nimport { Call } from \"../methods/call.js\";\n\nfunction FindPropertyKey(realm: Realm, keys: Array<PropertyKeyValue>, key: PropertyKeyValue): number {\n for (let i = 0; i < keys.length; ++i) {\n if (SamePropertyKey(realm, key, keys[i])) {\n return i;\n }\n }\n return -1;\n}\n\nexport default class ProxyValue extends ObjectValue {\n $ProxyTarget: NullValue | ObjectValue;\n $ProxyHandler: NullValue | ObjectValue;\n\n constructor(realm: Realm) {\n super(realm);\n }\n\n static trackedPropertyNames = ObjectValue.trackedPropertyNames.concat([\"$ProxyTarget\", \"$ProxyHandler\"]);\n\n getTrackedPropertyNames(): Array<string> {\n return ProxyValue.trackedPropertyNames;\n }\n\n isSimpleObject(): boolean {\n return false;\n }\n\n usesOrdinaryObjectInternalPrototypeMethods(): boolean {\n return false;\n }\n\n // ECMA262 9.5.1\n $GetPrototypeOf(): NullValue | AbstractObjectValue | ObjectValue {\n let realm = this.$Realm;\n\n // 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 2. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 3. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected an object\");\n\n // 4. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 5. Let trap be ? GetMethod(handler, \"getPrototypeOf\").\n let trap = GetMethod(realm, handler, \"getPrototypeOf\");\n\n // 6. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[GetPrototypeOf]]().\n return target.$GetPrototypeOf();\n }\n\n // 7. Let handlerProto be ? Call(trap, handler, « target »).\n let handlerProto = Call(realm, trap, handler, [target]);\n\n // 8. If Type(handlerProto) is neither Object nor Null, throw a TypeError exception.\n if (!(handlerProto instanceof ObjectValue) && !(handlerProto instanceof NullValue)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 9. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // 10. If extensibleTarget is true, return handlerProto.\n if (extensibleTarget) return handlerProto;\n\n // 11. Let targetProto be ? target.[[GetPrototypeOf]]().\n let targetProto = target.$GetPrototypeOf();\n\n // 12. If SameValue(handlerProto, targetProto) is false, throw a TypeError exception.\n if (!SameValuePartial(realm, handlerProto, targetProto)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 13. Return handlerProto.\n return handlerProto;\n }\n\n // ECMA262 9.5.2\n $SetPrototypeOf(V: ObjectValue | NullValue): boolean {\n let realm = this.$Realm;\n\n // 1. Assert: Either Type(V) is Object or Type(V) is Null.\n invariant(V instanceof ObjectValue || V instanceof NullValue, \"expected object or null\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 6. Let trap be ? GetMethod(handler, \"setPrototypeOf\").\n let trap = GetMethod(realm, handler, \"setPrototypeOf\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[SetPrototypeOf]](V).\n return target.$SetPrototypeOf(V);\n }\n\n // 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target, V »)).\n let booleanTrapResult = To.ToBooleanPartial(realm, Call(realm, trap, handler, [target, V]));\n\n // 9. If booleanTrapResult is false, return false.\n if (!booleanTrapResult) return false;\n\n // 10. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // 11. If extensibleTarget is true, return true.\n if (extensibleTarget) return true;\n\n // 12. Let targetProto be ? target.[[GetPrototypeOf]]().\n let targetProto = target.$GetPrototypeOf();\n\n // 13. If SameValue(V, targetProto) is false, throw a TypeError exception.\n if (!SameValuePartial(realm, V, targetProto)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 14. Return true.\n return true;\n }\n\n // ECMA262 9.5.3\n $IsExtensible(): boolean {\n let realm = this.$Realm;\n\n // 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 2. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 3. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 4. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n\n // 5. Let trap be ? GetMethod(handler, \"isExtensible\").\n let trap = GetMethod(realm, handler, \"isExtensible\");\n\n // 6. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[IsExtensible]]().\n invariant(target instanceof ObjectValue);\n return target.$IsExtensible();\n }\n\n // 7. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target »)).\n let booleanTrapResult = To.ToBooleanPartial(realm, Call(realm, trap, handler, [target]));\n\n // 8. Let targetResult be ? target.[[IsExtensible]]().\n invariant(target instanceof ObjectValue);\n let targetResult = target.$IsExtensible();\n\n // 9. If SameValue(booleanTrapResult, targetResult) is false, throw a TypeError exception.\n if (booleanTrapResult !== targetResult) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 10. Return booleanTrapResult.\n return booleanTrapResult;\n }\n\n // ECMA262 9.5.4\n $PreventExtensions(): boolean {\n let realm = this.$Realm;\n\n // 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 2. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 3. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 4. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n\n // 5. Let trap be ? GetMethod(handler, \"preventExtensions\").\n let trap = GetMethod(realm, handler, \"preventExtensions\");\n\n // 6. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[PreventExtensions]]().\n invariant(target instanceof ObjectValue);\n return target.$PreventExtensions();\n }\n\n // 7. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target »)).\n let booleanTrapResult = To.ToBooleanPartial(realm, Call(realm, trap, handler, [target]));\n\n // 8. If booleanTrapResult is true, then\n if (booleanTrapResult) {\n // a. Let targetIsExtensible be ? target.[[IsExtensible]]().\n invariant(target instanceof ObjectValue);\n let targetIsExtensible = target.$IsExtensible();\n\n // b. If targetIsExtensible is true, throw a TypeError exception.\n if (targetIsExtensible) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n\n // 9. Return booleanTrapResult.\n return booleanTrapResult;\n }\n\n // ECMA262 9.5.5\n $GetOwnProperty(P: PropertyKeyValue): Descriptor | void {\n let realm = this.$Realm;\n\n // 1. Assert: IsPropertyKey(P) is true.\n invariant(IsPropertyKey(realm, P), \"expected property key\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 6. Let trap be ? GetMethod(handler, \"getOwnPropertyDescriptor\").\n let trap = GetMethod(realm, handler, \"getOwnPropertyDescriptor\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[GetOwnProperty]](P).\n return target.$GetOwnProperty(P);\n }\n\n // 8. Let trapResultObj be ? Call(trap, handler, « target, P »).\n let trapResultObj = Call(realm, trap, handler, [target, typeof P === \"string\" ? new StringValue(realm, P) : P]);\n\n // 9. If Type(trapResultObj) is neither Object nor Undefined, throw a TypeError exception.\n if (!(trapResultObj instanceof ObjectValue) && !(trapResultObj instanceof UndefinedValue)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 10. Let targetDesc be ? target.[[GetOwnProperty]](P).\n let targetDesc = target.$GetOwnProperty(P);\n\n // 11. If trapResultObj is undefined, then\n if (trapResultObj instanceof UndefinedValue) {\n // a. If targetDesc is undefined, return undefined.\n if (!targetDesc) return undefined;\n Properties.ThrowIfMightHaveBeenDeleted(targetDesc.value);\n\n // b. If targetDesc.[[Configurable]] is false, throw a TypeError exception.\n if (!targetDesc.configurable) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // c. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // d. Assert: Type(extensibleTarget) is Boolean.\n invariant(typeof extensibleTarget === \"boolean\", \"expected boolean\");\n\n // e. If extensibleTarget is false, throw a TypeError exception.\n if (!extensibleTarget) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // f. Return undefined.\n return undefined;\n }\n\n // 12. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // 13. Let resultDesc be ? ToPropertyDescriptor(trapResultObj).\n let resultDesc = To.ToPropertyDescriptor(realm, trapResultObj);\n\n // 14. Call CompletePropertyDescriptor(resultDesc).\n Properties.CompletePropertyDescriptor(realm, resultDesc);\n\n // 15. Let valid be IsCompatiblePropertyDescriptor(extensibleTarget, resultDesc, targetDesc).\n let valid = Properties.IsCompatiblePropertyDescriptor(realm, extensibleTarget, resultDesc, targetDesc);\n\n // 16. If valid is false, throw a TypeError exception.\n if (!valid) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 17. If resultDesc.[[Configurable]] is false, then\n if (!resultDesc.configurable) {\n // a. If targetDesc is undefined or targetDesc.[[Configurable]] is true, then\n if (!targetDesc || targetDesc.configurable) {\n // i. Throw a TypeError exception.\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n\n // 18. Return resultDesc.\n return resultDesc;\n }\n\n // ECMA262 9.5.6\n $DefineOwnProperty(P: PropertyKeyValue, Desc: Descriptor): boolean {\n let realm = this.$Realm;\n\n // 1. Assert: IsPropertyKey(P) is true.\n invariant(IsPropertyKey(realm, P), \"expected property key\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 6. Let trap be ? GetMethod(handler, \"defineProperty\").\n let trap = GetMethod(realm, handler, \"defineProperty\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[DefineOwnProperty]](P, Desc).\n return target.$DefineOwnProperty(P, Desc);\n }\n\n // 8. Let descObj be FromPropertyDescriptor(Desc).\n let descObj = Properties.FromPropertyDescriptor(realm, Desc);\n\n // 9. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target, P, descObj »)).\n let booleanTrapResult = To.ToBooleanPartial(\n realm,\n Call(realm, trap, handler, [target, typeof P === \"string\" ? new StringValue(realm, P) : P, descObj])\n );\n\n // 10. If booleanTrapResult is false, return false.\n if (!booleanTrapResult) return false;\n\n // 11. Let targetDesc be ? target.[[GetOwnProperty]](P).\n let targetDesc = target.$GetOwnProperty(P);\n\n // 12. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // 13. If Desc has a [[Configurable]] field and if Desc.[[Configurable]] is false, then\n let settingConfigFalse;\n if (\"configurable\" in Desc && !Desc.configurable) {\n // a. Let settingConfigFalse be true.\n settingConfigFalse = true;\n } else {\n // 14. Else let settingConfigFalse be false.\n settingConfigFalse = false;\n }\n\n // 15. If targetDesc is undefined, then\n if (!targetDesc) {\n // a. If extensibleTarget is false, throw a TypeError exception.\n if (!extensibleTarget) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // b. If settingConfigFalse is true, throw a TypeError exception.\n if (settingConfigFalse) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n } else {\n // 16. Else targetDesc is not undefined,\n Properties.ThrowIfMightHaveBeenDeleted(targetDesc.value);\n\n // a. If IsCompatiblePropertyDescriptor(extensibleTarget, Desc, targetDesc) is false, throw a TypeError exception.\n if (!Properties.IsCompatiblePropertyDescriptor(realm, extensibleTarget, Desc, targetDesc)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // b. If settingConfigFalse is true and targetDesc.[[Configurable]] is true, throw a TypeError exception.\n if (settingConfigFalse && targetDesc.configurable) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n\n // 17. Return true.\n return true;\n }\n\n // ECMA262 9.5.7\n $HasProperty(P: PropertyKeyValue): boolean {\n let realm = this.$Realm;\n\n // 1. Assert: IsPropertyKey(P) is true.\n invariant(IsPropertyKey(realm, P), \"expected property key\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 6. Let trap be ? GetMethod(handler, \"has\").\n let trap = GetMethod(realm, handler, \"has\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[HasProperty]](P).\n return target.$HasProperty(P);\n }\n\n // 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target, P »)).\n let booleanTrapResult = To.ToBooleanPartial(\n realm,\n Call(realm, trap, handler, [target, typeof P === \"string\" ? new StringValue(realm, P) : P])\n );\n\n // 9. If booleanTrapResult is false, then\n if (!booleanTrapResult) {\n // a. Let targetDesc be ? target.[[GetOwnProperty]](P).\n let targetDesc = target.$GetOwnProperty(P);\n\n // b. If targetDesc is not undefined, then\n if (targetDesc) {\n Properties.ThrowIfMightHaveBeenDeleted(targetDesc.value);\n\n // i. If targetDesc.[[Configurable]] is false, throw a TypeError exception.\n if (!targetDesc.configurable) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // ii. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // iii. If extensibleTarget is false, throw a TypeError exception.\n if (!extensibleTarget) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n }\n\n // 10. Return booleanTrapResult.\n return booleanTrapResult;\n }\n\n // ECMA262 9.5.8\n $Get(P: PropertyKeyValue, Receiver: Value): Value {\n let realm = this.$Realm;\n\n // 1. Assert: IsPropertyKey(P) is true.\n invariant(IsPropertyKey(realm, P), \"expected property key\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 6. Let trap be ? GetMethod(handler, \"get\").\n let trap = GetMethod(realm, handler, \"get\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[Get]](P, Receiver).\n return target.$Get(P, Receiver);\n }\n\n // 8. Let trapResult be ? Call(trap, handler, « target, P, Receiver »).\n let trapResult = Call(realm, trap, handler, [\n target,\n typeof P === \"string\" ? new StringValue(realm, P) : P,\n Receiver,\n ]);\n\n // 9. Let targetDesc be ? target.[[GetOwnProperty]](P).\n let targetDesc = target.$GetOwnProperty(P);\n\n // 10. If targetDesc is not undefined, then\n if (targetDesc) {\n Properties.ThrowIfMightHaveBeenDeleted(targetDesc.value);\n\n // a. If IsDataDescriptor(targetDesc) is true and targetDesc.[[Configurable]] is false and targetDesc.[[Writable]] is false, then\n if (IsDataDescriptor(realm, targetDesc) && targetDesc.configurable === false && targetDesc.writable === false) {\n // i. If SameValue(trapResult, targetDesc.[[Value]]) is false, throw a TypeError exception.\n let targetValue = targetDesc.value || realm.intrinsics.undefined;\n invariant(targetValue instanceof Value);\n if (!SameValuePartial(realm, trapResult, targetValue)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n\n // b. If IsAccessorDescriptor(targetDesc) is true and targetDesc.[[Configurable]] is false and targetDesc.[[Get]] is undefined, then\n if (\n IsAccessorDescriptor(realm, targetDesc) &&\n targetDesc.configurable === false &&\n (!targetDesc.get || targetDesc.get instanceof UndefinedValue)\n ) {\n // i. If trapResult is not undefined, throw a TypeError exception.\n if (!(trapResult instanceof UndefinedValue)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n }\n\n // 11. Return trapResult.\n return trapResult;\n }\n\n // ECMA262 9.5.9\n $Set(P: PropertyKeyValue, V: Value, Receiver: Value): boolean {\n let realm = this.$Realm;\n\n // 1. Assert: IsPropertyKey(P) is true.\n invariant(IsPropertyKey(realm, P), \"expected property key\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n\n // 6. Let trap be ? GetMethod(handler, \"set\").\n let trap = GetMethod(realm, handler, \"set\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[Set]](P, V, Receiver).\n invariant(target instanceof ObjectValue);\n return target.$Set(P, V, Receiver);\n }\n\n // 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target, P, V, Receiver »)).\n let booleanTrapResult = To.ToBooleanPartial(\n realm,\n Call(realm, trap, handler, [target, typeof P === \"string\" ? new StringValue(realm, P) : P, V, Receiver])\n );\n\n // 9. If booleanTrapResult is false, return false.\n if (!booleanTrapResult) return false;\n\n // 10. Let targetDesc be ? target.[[GetOwnProperty]](P).\n invariant(target instanceof ObjectValue);\n let targetDesc = target.$GetOwnProperty(P);\n\n // 11. If targetDesc is not undefined, then\n if (targetDesc) {\n Properties.ThrowIfMightHaveBeenDeleted(targetDesc.value);\n\n // a. If IsDataDescriptor(targetDesc) is true and targetDesc.[[Configurable]] is false and targetDesc.[[Writable]] is false, then\n if (IsDataDescriptor(realm, targetDesc) && !targetDesc.configurable && !targetDesc.writable) {\n // i. If SameValue(V, targetDesc.[[Value]]) is false, throw a TypeError exception.\n let targetValue = targetDesc.value || realm.intrinsics.undefined;\n invariant(targetValue instanceof Value);\n if (!SameValuePartial(realm, V, targetValue)) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n\n // b. If IsAccessorDescriptor(targetDesc) is true and targetDesc.[[Configurable]] is false, then\n if (IsAccessorDescriptor(realm, targetDesc) && !targetDesc.configurable) {\n // i. If targetDesc.[[Set]] is undefined, throw a TypeError exception.\n if (!targetDesc.set || targetDesc.set instanceof UndefinedValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n }\n }\n\n // 12. Return true.\n return true;\n }\n\n // ECMA262 9.5.10\n $Delete(P: PropertyKeyValue): boolean {\n let realm = this.$Realm;\n\n // 1. Assert: IsPropertyKey(P) is true.\n invariant(IsPropertyKey(realm, P), \"expected property key\");\n\n // 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 3. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 4. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 5. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n\n // 6. Let trap be ? GetMethod(handler, \"deleteProperty\").\n let trap = GetMethod(realm, handler, \"deleteProperty\");\n\n // 7. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[Delete]](P).\n invariant(target instanceof ObjectValue);\n return target.$Delete(P);\n }\n\n // 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target, P »)).\n let booleanTrapResult = To.ToBooleanPartial(\n realm,\n Call(realm, trap, handler, [target, typeof P === \"string\" ? new StringValue(realm, P) : P])\n );\n\n // 9. If booleanTrapResult is false, return false.\n if (!booleanTrapResult) return false;\n\n // 10. Let targetDesc be ? target.[[GetOwnProperty]](P).\n invariant(target instanceof ObjectValue);\n let targetDesc = target.$GetOwnProperty(P);\n\n // 11. If targetDesc is undefined, return true.\n if (!targetDesc) return true;\n Properties.ThrowIfMightHaveBeenDeleted(targetDesc.value);\n\n // 12. If targetDesc.[[Configurable]] is false, throw a TypeError exception.\n if (!targetDesc.configurable) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 13. Return true.\n return true;\n }\n\n // ECMA262 9.5.11\n $OwnPropertyKeys(): Array<PropertyKeyValue> {\n let realm = this.$Realm;\n\n // 1. Let handler be the value of the [[ProxyHandler]] internal slot of O.\n let handler = this.$ProxyHandler;\n\n // 2. If handler is null, throw a TypeError exception.\n if (handler instanceof NullValue) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 3. Assert: Type(handler) is Object.\n invariant(handler instanceof ObjectValue, \"expected object\");\n\n // 4. Let target be the value of the [[ProxyTarget]] internal slot of O.\n let target = this.$ProxyTarget;\n invariant(target instanceof ObjectValue);\n\n // 5. Let trap be ? GetMethod(handler, \"ownKeys\").\n let trap = GetMethod(realm, handler, \"ownKeys\");\n\n // 6. If trap is undefined, then\n if (trap instanceof UndefinedValue) {\n // a. Return ? target.[[OwnPropertyKeys]]().\n return target.$OwnPropertyKeys();\n }\n\n // 7. Let trapResultArray be ? Call(trap, handler, « target »).\n let trapResultArray = Call(realm, trap, handler, [target]);\n\n // 8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).\n let trapResult: Array<PropertyKeyValue> = ((Create.CreateListFromArrayLike(realm, trapResultArray, [\n \"String\",\n \"Symbol\",\n ]): any): Array<PropertyKeyValue>);\n\n // 9. Let extensibleTarget be ? IsExtensible(target).\n let extensibleTarget = IsExtensible(realm, target);\n\n // 10. Let targetKeys be ? target.[[OwnPropertyKeys]]().\n let targetKeys = target.$OwnPropertyKeys();\n\n // 11. Assert: targetKeys is a List containing only String and Symbol values.\n for (let key of targetKeys) {\n invariant(key instanceof SymbolValue || key instanceof StringValue, \"expected string or symbol\");\n }\n\n // 12. Let targetConfigurableKeys be a new empty List.\n let targetConfigurableKeys = [];\n\n // 13. Let targetNonconfigurableKeys be a new empty List.\n let targetNonconfigurableKeys = [];\n\n // 14. Repeat, for each element key of targetKeys,\n for (let key of targetKeys) {\n // a. Let desc be ? target.[[GetOwnProperty]](key).\n let desc = target.$GetOwnProperty(key);\n if (desc) Properties.ThrowIfMightHaveBeenDeleted(desc.value);\n\n // b. If desc is not undefined and desc.[[Configurable]] is false, then\n if (desc && desc.configurable === false) {\n // i. Append key as an element of targetNonconfigurableKeys.\n targetNonconfigurableKeys.push(key);\n } else {\n // c. Else,\n // i. Append key as an element of targetConfigurableKeys.\n targetConfigurableKeys.push(key);\n }\n }\n\n // 15. If extensibleTarget is true and targetNonconfigurableKeys is empty, then\n if (extensibleTarget && !targetNonconfigurableKeys.length) {\n // a. Return trapResult.\n return trapResult;\n }\n\n // 16. Let uncheckedResultKeys be a new List which is a copy of trapResult.\n let uncheckedResultKeys = trapResult.slice();\n\n // 17. Repeat, for each key that is an element of targetNonconfigurableKeys,\n for (let key of targetNonconfigurableKeys) {\n // a. If key is not an element of uncheckedResultKeys, throw a TypeError exception.\n let index = FindPropertyKey(realm, uncheckedResultKeys, key);\n if (index < 0) {\n throw realm.createErrorThrowCompletion(\n realm.intrinsics.TypeError,\n \"key is not an element of uncheckedResultKeys\"\n );\n }\n\n // b. Remove key from uncheckedResultKeys.\n uncheckedResultKeys.splice(index, 1);\n }\n\n // 18. If extensibleTarget is true, return trapResult.\n if (extensibleTarget) return trapResult;\n\n // 19. Repeat, for each key that is an element of targetConfigurableKeys,\n for (let key of targetConfigurableKeys) {\n // a. If key is not an element of uncheckedResultKeys, throw a TypeError exception.\n let index = FindPropertyKey(realm, uncheckedResultKeys, key);\n if (index < 0) {\n throw realm.createErrorThrowCompletion(\n realm.intrinsics.TypeError,\n \"key is not an element of uncheckedResultKeys\"\n );\n }\n\n // b. Remove key from uncheckedResultKeys.\n uncheckedResultKeys.splice(index, 1);\n }\n\n // 20. If uncheckedResultKeys is not empty, throw a TypeError exception.\n if (uncheckedResultKeys.length) {\n throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);\n }\n\n // 21. Return trapResult.\n return trapResult;\n }\n}\n"],"file":"ProxyValue.js"} |