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/*
* 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));
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;
}
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;
}
// 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();
}
}
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