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
|
// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"use strict";
// This file relies on the fact that the following declaration has been made
// in runtime.js:
// var $Array = global.Array;
var $Symbol = global.Symbol;
// -------------------------------------------------------------------
function SymbolConstructor(x) {
if (%_IsConstructCall()) {
throw MakeTypeError('not_constructor', ["Symbol"]);
}
// NOTE: Passing in a Symbol value will throw on ToString().
return %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x));
}
function SymbolToString() {
if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
throw MakeTypeError(
'incompatible_method_receiver', ["Symbol.prototype.toString", this]);
}
var description = %SymbolDescription(%_ValueOf(this));
return "Symbol(" + (IS_UNDEFINED(description) ? "" : description) + ")";
}
function SymbolValueOf() {
if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
throw MakeTypeError(
'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]);
}
return %_ValueOf(this);
}
function InternalSymbol(key) {
var internal_registry = %SymbolRegistry().for_intern;
if (IS_UNDEFINED(internal_registry[key])) {
internal_registry[key] = %CreateSymbol(key);
}
return internal_registry[key];
}
function SymbolFor(key) {
key = TO_STRING_INLINE(key);
var registry = %SymbolRegistry();
if (IS_UNDEFINED(registry.for[key])) {
var symbol = %CreateSymbol(key);
registry.for[key] = symbol;
registry.keyFor[symbol] = key;
}
return registry.for[key];
}
function SymbolKeyFor(symbol) {
if (!IS_SYMBOL(symbol)) throw MakeTypeError("not_a_symbol", [symbol]);
return %SymbolRegistry().keyFor[symbol];
}
// ES6 19.1.2.8
function ObjectGetOwnPropertySymbols(obj) {
if (!IS_SPEC_OBJECT(obj)) {
throw MakeTypeError("called_on_non_object",
["Object.getOwnPropertySymbols"]);
}
// TODO(arv): Proxies use a shared trap for String and Symbol keys.
return ObjectGetOwnPropertyKeys(obj, true);
}
//-------------------------------------------------------------------
var symbolCreate = InternalSymbol("Symbol.create");
var symbolHasInstance = InternalSymbol("Symbol.hasInstance");
var symbolIsConcatSpreadable = InternalSymbol("Symbol.isConcatSpreadable");
var symbolIsRegExp = InternalSymbol("Symbol.isRegExp");
var symbolIterator = InternalSymbol("Symbol.iterator");
var symbolToStringTag = InternalSymbol("Symbol.toStringTag");
var symbolUnscopables = InternalSymbol("Symbol.unscopables");
//-------------------------------------------------------------------
function SetUpSymbol() {
%CheckIsBootstrapping();
%SetCode($Symbol, SymbolConstructor);
%FunctionSetPrototype($Symbol, new $Object());
InstallConstants($Symbol, $Array(
"create", symbolCreate,
"hasInstance", symbolHasInstance,
"isConcatSpreadable", symbolIsConcatSpreadable,
"isRegExp", symbolIsRegExp,
"iterator", symbolIterator,
"toStringTag", symbolToStringTag,
"unscopables", symbolUnscopables
));
InstallFunctions($Symbol, DONT_ENUM, $Array(
"for", SymbolFor,
"keyFor", SymbolKeyFor
));
%SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM);
InstallFunctions($Symbol.prototype, DONT_ENUM, $Array(
"toString", SymbolToString,
"valueOf", SymbolValueOf
));
}
SetUpSymbol();
function ExtendObject() {
%CheckIsBootstrapping();
InstallFunctions($Object, DONT_ENUM, $Array(
"getOwnPropertySymbols", ObjectGetOwnPropertySymbols
));
}
ExtendObject();
|
