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
|
/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/SymbolConstructor.h>
namespace JS {
SymbolConstructor::SymbolConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.Symbol, *global_object.function_prototype())
{
}
void SymbolConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 20.4.2.9 Symbol.prototype, https://tc39.es/ecma262/#sec-symbol.prototype
define_property(vm.names.prototype, global_object.symbol_prototype(), 0);
define_property(vm.names.length, Value(0), Attribute::Configurable);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.for_, for_, 1, attr);
define_native_function(vm.names.keyFor, key_for, 1, attr);
#define __JS_ENUMERATE(SymbolName, snake_name) \
define_property(vm.names.SymbolName, vm.well_known_symbol_##snake_name(), 0);
JS_ENUMERATE_WELL_KNOWN_SYMBOLS
#undef __JS_ENUMERATE
}
SymbolConstructor::~SymbolConstructor()
{
}
// 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
Value SymbolConstructor::call()
{
if (vm().argument(0).is_undefined())
return js_symbol(heap(), {}, false);
return js_symbol(heap(), vm().argument(0).to_string(global_object()), false);
}
// 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
Value SymbolConstructor::construct(Function&)
{
vm().throw_exception<TypeError>(global_object(), ErrorType::NotAConstructor, "Symbol");
return {};
}
// 20.4.2.2 Symbol.for ( key ), https://tc39.es/ecma262/#sec-symbol.for
JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::for_)
{
String description = vm.argument(0).to_string(global_object);
return global_object.vm().get_global_symbol(description);
}
// 20.4.2.6 Symbol.keyFor ( sym ), https://tc39.es/ecma262/#sec-symbol.keyfor
JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::key_for)
{
auto argument = vm.argument(0);
if (!argument.is_symbol()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotASymbol, argument.to_string_without_side_effects());
return {};
}
auto& symbol = argument.as_symbol();
if (symbol.is_global())
return js_string(vm, symbol.description());
return js_undefined();
}
}
|
