1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-object-initializer-runtime-semantics-propertydefinitionevaluation
description: >
Proxy's "get" trap is not invoked for non-enumerable keys.
info: |
PropertyDefinition : ... AssignmentExpression
[...]
3. Let excludedNames be a new empty List.
4. Return ? CopyDataProperties(object, fromValue, excludedNames).
CopyDataProperties ( target, source, excludedItems )
[...]
5. Let keys be ? from.[[OwnPropertyKeys]]().
6. For each element nextKey of keys in List order, do
[...]
c. If excluded is false, then
i. Let desc be ? from.[[GetOwnProperty]](nextKey).
ii. If desc is not undefined and desc.[[Enumerable]] is true, then
1. Let propValue be ? Get(from, nextKey).
2. Perform ! CreateDataPropertyOrThrow(target, nextKey, propValue).
[[OwnPropertyKeys]] ( )
[...]
7. Let trapResultArray be ? Call(trap, handler, « target »).
8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
[...]
23. Return trapResult.
features: [object-spread, Proxy, Symbol]
includes: [compareArray.js, propertyHelper.js]
---*/
var VALUE_LITERAL = "VALUE_LITERAL";
var VALUE_GOPD = "VALUE_GOPD";
var VALUE_GET = "VALUE_GET";
var dontEnumSymbol = Symbol("dont_enum_symbol");
var enumerableSymbol = Symbol("enumerable_symbol");
var dontEnumKeys = [dontEnumSymbol, "dontEnumString", "0"];
var enumerableKeys = [enumerableSymbol, "enumerableString", "1"];
var ownKeysResult = [...dontEnumKeys, ...enumerableKeys];
var getOwnKeys = [];
var getKeys = [];
var proxy = new Proxy({}, {
getOwnPropertyDescriptor: function(_target, key) {
getOwnKeys.push(key);
var isEnumerable = enumerableKeys.indexOf(key) !== -1;
return {value: VALUE_GOPD, writable: false, enumerable: isEnumerable, configurable: true};
},
get: function(_target, key) {
getKeys.push(key);
return VALUE_GET;
},
ownKeys: function() {
return ownKeysResult;
},
});
var result = {[enumerableSymbol]: VALUE_LITERAL, enumerableString: VALUE_LITERAL, [1]: VALUE_LITERAL, ...proxy};
assert.compareArray(getOwnKeys, ownKeysResult);
assert.compareArray(getKeys, enumerableKeys);
verifyProperty(result, enumerableSymbol, {value: VALUE_GET, writable: true, enumerable: true, configurable: true});
verifyProperty(result, "enumerableString", {value: VALUE_GET, writable: true, enumerable: true, configurable: true});
verifyProperty(result, "1", {value: VALUE_GET, writable: true, enumerable: true, configurable: true});
reportCompare(0, 0);
|
