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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// ES6 draft rev36 2015-03-17 19.1.2.1
function ObjectStaticAssign(target, firstSource) {
// Steps 1-2.
var to = ToObject(target);
// Step 3.
if (arguments.length < 2)
return to;
// Steps 4-5.
for (var i = 1; i < arguments.length; i++) {
// Step 5.a.
var nextSource = arguments[i];
if (nextSource === null || nextSource === undefined)
continue;
// Steps 5.b.i-ii.
var from = ToObject(nextSource);
// Steps 5.b.iii-iv.
var keys = OwnPropertyKeys(from, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS);
// Step 5.c.
for (var nextIndex = 0, len = keys.length; nextIndex < len; nextIndex++) {
var nextKey = keys[nextIndex];
// Steps 5.c.i-iii. We abbreviate this by calling propertyIsEnumerable
// which is faster and returns false for not defined properties.
if (callFunction(std_Object_propertyIsEnumerable, from, nextKey)) {
// Steps 5.c.iii.1-4.
to[nextKey] = from[nextKey];
}
}
}
// Step 6.
return to;
}
// ES stage 4 proposal
function ObjectGetOwnPropertyDescriptors(O) {
// Step 1.
var obj = ToObject(O);
// Step 2.
var keys = OwnPropertyKeys(obj, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS);
// Step 3.
var descriptors = {};
// Step 4.
for (var index = 0, len = keys.length; index < len; index++) {
var key = keys[index];
// Steps 4.a-b.
var desc = std_Object_getOwnPropertyDescriptor(obj, key);
// Step 4.c.
if (typeof desc !== "undefined")
_DefineDataProperty(descriptors, key, desc);
}
// Step 5.
return descriptors;
}
/* ES6 draft rev 32 (2015 Feb 2) 19.1.2.9. */
function ObjectGetPrototypeOf(obj) {
return std_Reflect_getPrototypeOf(ToObject(obj));
}
/* ES6 draft rev 32 (2015 Feb 2) 19.1.2.11. */
function ObjectIsExtensible(obj) {
return IsObject(obj) && std_Reflect_isExtensible(obj);
}
/* ES2015 19.1.3.5 Object.prototype.toLocaleString */
function Object_toLocaleString() {
// Step 1.
var O = this;
// Step 2.
return callContentFunction(O.toString, O);
}
// ES 2017 draft bb96899bb0d9ef9be08164a26efae2ee5f25e875 19.1.3.7
function Object_valueOf() {
// Step 1.
return ToObject(this);
}
// ES7 draft (2016 March 8) B.2.2.3
function ObjectDefineSetter(name, setter) {
// Step 1.
var object = ToObject(this);
// Step 2.
if (!IsCallable(setter))
ThrowTypeError(JSMSG_BAD_GETTER_OR_SETTER, "setter");
// Step 3.
var desc = {
__proto__: null,
enumerable: true,
configurable: true,
set: setter
};
// Step 4.
var key = ToPropertyKey(name);
// Step 5.
std_Object_defineProperty(object, key, desc);
// Step 6. (implicit)
}
// ES7 draft (2016 March 8) B.2.2.2
function ObjectDefineGetter(name, getter) {
// Step 1.
var object = ToObject(this);
// Step 2.
if (!IsCallable(getter))
ThrowTypeError(JSMSG_BAD_GETTER_OR_SETTER, "getter");
// Step 3.
var desc = {
__proto__: null,
enumerable: true,
configurable: true,
get: getter
};
// Step 4.
var key = ToPropertyKey(name);
// Step 5.
std_Object_defineProperty(object, key, desc);
// Step 6. (implicit)
}
// ES7 draft (2016 March 8) B.2.2.5
function ObjectLookupSetter(name) {
// Step 1.
var object = ToObject(this);
// Step 2.
var key = ToPropertyKey(name)
do {
// Step 3.a.
var desc = std_Object_getOwnPropertyDescriptor(object, key);
// Step 3.b.
if (desc) {
// Step.b.i.
if (callFunction(std_Object_hasOwnProperty, desc, "set"))
return desc.set;
// Step.b.ii.
return undefined;
}
// Step 3.c.
object = std_Reflect_getPrototypeOf(object);
} while (object !== null);
// Step 3.d. (implicit)
}
// ES7 draft (2016 March 8) B.2.2.4
function ObjectLookupGetter(name) {
// Step 1.
var object = ToObject(this);
// Step 2.
var key = ToPropertyKey(name)
do {
// Step 3.a.
var desc = std_Object_getOwnPropertyDescriptor(object, key);
// Step 3.b.
if (desc) {
// Step.b.i.
if (callFunction(std_Object_hasOwnProperty, desc, "get"))
return desc.get;
// Step.b.ii.
return undefined;
}
// Step 3.c.
object = std_Reflect_getPrototypeOf(object);
} while (object !== null);
// Step 3.d. (implicit)
}
// Stage 4 draft 2020-09-06 https://tc39.github.io/proposal-object-from-entries/
// Object.fromEntries (iterable)
function ObjectFromEntries(iter) {
// We omit the usual step number comments here because they don't help.
// This implementation inlines AddEntriesFromIterator and
// CreateDataPropertyOnObject, so it looks more like the polyfill
// than the step-by-step spec algorithm.
const obj = {};
for (const pair of allowContentIter(iter)) {
if (!IsObject(pair))
ThrowTypeError(JSMSG_INVALID_MAP_ITERABLE, "Object.fromEntries");
_DefineDataProperty(obj, pair[0], pair[1]);
}
return obj;
}
|
