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
|
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Function.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/ArrayConstructor.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorOperations.h>
#include <LibJS/Runtime/Shape.h>
namespace JS {
ArrayConstructor::ArrayConstructor(Realm& realm)
: NativeFunction(realm.vm().names.Array.as_string(), *realm.intrinsics().function_prototype())
{
}
void ArrayConstructor::initialize(Realm& realm)
{
auto& vm = this->vm();
NativeFunction::initialize(realm);
// 23.1.2.4 Array.prototype, https://tc39.es/ecma262/#sec-array.prototype
define_direct_property(vm.names.prototype, realm.intrinsics().array_prototype(), 0);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(realm, vm.names.from, from, 1, attr);
define_native_function(realm, vm.names.isArray, is_array, 1, attr);
define_native_function(realm, vm.names.of, of, 0, attr);
// 23.1.2.5 get Array [ @@species ], https://tc39.es/ecma262/#sec-get-array-@@species
define_native_accessor(realm, *vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
}
// 23.1.1.1 Array ( ...values ), https://tc39.es/ecma262/#sec-array
ThrowCompletionOr<Value> ArrayConstructor::call()
{
return TRY(construct(*this));
}
// 23.1.1.1 Array ( ...values ), https://tc39.es/ecma262/#sec-array
ThrowCompletionOr<Object*> ArrayConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
auto& realm = *vm.current_realm();
auto* proto = TRY(get_prototype_from_constructor(vm, new_target, &Intrinsics::array_prototype));
if (vm.argument_count() == 0)
return MUST(Array::create(realm, 0, proto)).ptr();
if (vm.argument_count() == 1) {
auto length = vm.argument(0);
auto array = MUST(Array::create(realm, 0, proto));
size_t int_length;
if (!length.is_number()) {
MUST(array->create_data_property_or_throw(0, length));
int_length = 1;
} else {
int_length = MUST(length.to_u32(vm));
if (int_length != length.as_double())
return vm.throw_completion<RangeError>(ErrorType::InvalidLength, "array");
}
TRY(array->set(vm.names.length, Value(int_length), Object::ShouldThrowExceptions::Yes));
return array.ptr();
}
auto array = TRY(Array::create(realm, vm.argument_count(), proto));
for (size_t k = 0; k < vm.argument_count(); ++k)
MUST(array->create_data_property_or_throw(k, vm.argument(k)));
return array.ptr();
}
// 23.1.2.1 Array.from ( items [ , mapfn [ , thisArg ] ] ), https://tc39.es/ecma262/#sec-array.from
JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::from)
{
auto& realm = *vm.current_realm();
auto constructor = vm.this_value();
FunctionObject* map_fn = nullptr;
if (!vm.argument(1).is_undefined()) {
auto callback = vm.argument(1);
if (!callback.is_function())
return vm.throw_completion<TypeError>(ErrorType::NotAFunction, callback.to_string_without_side_effects());
map_fn = &callback.as_function();
}
auto this_arg = vm.argument(2);
auto items = vm.argument(0);
auto using_iterator = TRY(items.get_method(vm, *vm.well_known_symbol_iterator()));
if (using_iterator) {
Object* array;
if (constructor.is_constructor())
array = TRY(JS::construct(vm, constructor.as_function(), {}));
else
array = MUST(Array::create(realm, 0));
auto iterator = TRY(get_iterator(vm, items, IteratorHint::Sync, using_iterator));
size_t k = 0;
while (true) {
if (k >= MAX_ARRAY_LIKE_INDEX) {
auto error = vm.throw_completion<TypeError>(ErrorType::ArrayMaxSize);
return TRY(iterator_close(vm, iterator, move(error)));
}
auto* next = TRY(iterator_step(vm, iterator));
if (!next) {
TRY(array->set(vm.names.length, Value(k), Object::ShouldThrowExceptions::Yes));
return array;
}
auto next_value = TRY(iterator_value(vm, *next));
Value mapped_value;
if (map_fn) {
auto mapped_value_or_error = JS::call(vm, *map_fn, this_arg, next_value, Value(k));
if (mapped_value_or_error.is_error())
return TRY(iterator_close(vm, iterator, mapped_value_or_error.release_error()));
mapped_value = mapped_value_or_error.release_value();
} else {
mapped_value = next_value;
}
auto result_or_error = array->create_data_property_or_throw(k, mapped_value);
if (result_or_error.is_error())
return TRY(iterator_close(vm, iterator, result_or_error.release_error()));
++k;
}
}
auto* array_like = MUST(items.to_object(vm));
auto length = TRY(length_of_array_like(vm, *array_like));
Object* array;
if (constructor.is_constructor())
array = TRY(JS::construct(vm, constructor.as_function(), Value(length)));
else
array = TRY(Array::create(realm, length));
for (size_t k = 0; k < length; ++k) {
auto k_value = TRY(array_like->get(k));
Value mapped_value;
if (map_fn)
mapped_value = TRY(JS::call(vm, *map_fn, this_arg, k_value, Value(k)));
else
mapped_value = k_value;
TRY(array->create_data_property_or_throw(k, mapped_value));
}
TRY(array->set(vm.names.length, Value(length), Object::ShouldThrowExceptions::Yes));
return array;
}
// 23.1.2.2 Array.isArray ( arg ), https://tc39.es/ecma262/#sec-array.isarray
JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::is_array)
{
auto value = vm.argument(0);
return Value(TRY(value.is_array(vm)));
}
// 23.1.2.3 Array.of ( ...items ), https://tc39.es/ecma262/#sec-array.of
JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::of)
{
auto& realm = *vm.current_realm();
auto this_value = vm.this_value();
Object* array;
if (this_value.is_constructor())
array = TRY(JS::construct(vm, this_value.as_function(), Value(vm.argument_count())));
else
array = TRY(Array::create(realm, vm.argument_count()));
for (size_t k = 0; k < vm.argument_count(); ++k)
TRY(array->create_data_property_or_throw(k, vm.argument(k)));
TRY(array->set(vm.names.length, Value(vm.argument_count()), Object::ShouldThrowExceptions::Yes));
return array;
}
// 23.1.2.5 get Array [ @@species ], https://tc39.es/ecma262/#sec-get-array-@@species
JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::symbol_species_getter)
{
return vm.this_value();
}
}
|
