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1 // Copyright 2014 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 // | |
5 | |
6 (function(global, utils) { | |
7 | |
8 "use strict"; | |
9 | |
10 %CheckIsBootstrapping(); | |
11 | |
12 // ------------------------------------------------------------------- | |
13 // Imports | |
14 | |
15 var GlobalObject = global.Object; | |
16 var OwnPropertyKeys; | |
17 | |
18 utils.Import(function(from) { | |
19 OwnPropertyKeys = from.OwnPropertyKeys; | |
20 }); | |
21 | |
22 // ------------------------------------------------------------------- | |
23 | |
24 // ES6, draft 04-03-15, section 19.1.2.1 | |
25 function ObjectAssign(target, sources) { | |
26 var to = TO_OBJECT(target); | |
27 var argsLen = %_ArgumentsLength(); | |
28 if (argsLen < 2) return to; | |
29 | |
30 for (var i = 1; i < argsLen; ++i) { | |
31 var nextSource = %_Arguments(i); | |
32 if (IS_NULL_OR_UNDEFINED(nextSource)) { | |
33 continue; | |
34 } | |
35 | |
36 var from = TO_OBJECT(nextSource); | |
37 var keys = OwnPropertyKeys(from); | |
38 var len = keys.length; | |
39 | |
40 for (var j = 0; j < len; ++j) { | |
41 var key = keys[j]; | |
42 if (%IsPropertyEnumerable(from, key)) { | |
43 var propValue = from[key]; | |
44 to[key] = propValue; | |
45 } | |
46 } | |
47 } | |
48 return to; | |
49 } | |
50 | |
51 // Set up non-enumerable functions on the Object object. | |
52 utils.InstallFunctions(GlobalObject, DONT_ENUM, [ | |
53 "assign", ObjectAssign | |
54 ]); | |
55 | |
56 }) | |
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