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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, 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(GlobalObject& global_object)
: NativeFunction(vm().names.Array.as_string(), *global_object.function_prototype())
{
}
ArrayConstructor::~ArrayConstructor()
{
}
void ArrayConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 23.1.2.4 Array.prototype, https://tc39.es/ecma262/#sec-array.prototype
define_direct_property(vm.names.prototype, global_object.array_prototype(), 0);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.from, from, 1, attr);
define_native_function(vm.names.isArray, is_array, 1, attr);
define_native_function(vm.names.of, of, 0, attr);
// 23.1.2.5 get Array [ @@species ], https://tc39.es/ecma262/#sec-get-array-@@species
define_native_accessor(*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
Value ArrayConstructor::call()
{
return construct(*this);
}
// 23.1.1.1 Array ( ...values ), https://tc39.es/ecma262/#sec-array
Value ArrayConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
auto* proto = TRY_OR_DISCARD(get_prototype_from_constructor(global_object(), new_target, &GlobalObject::array_prototype));
if (vm.argument_count() == 0)
return Array::create(global_object(), 0, proto);
if (vm.argument_count() == 1) {
auto length = vm.argument(0);
auto* array = Array::create(global_object(), 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(global_object()));
if (int_length != length.as_double()) {
vm.throw_exception<RangeError>(global_object(), ErrorType::InvalidLength, "array");
return {};
}
}
TRY_OR_DISCARD(array->set(vm.names.length, Value(int_length), Object::ShouldThrowExceptions::Yes));
return array;
}
auto* array = Array::create(global_object(), vm.argument_count(), proto);
if (vm.exception())
return {};
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 constructor = vm.this_value(global_object);
FunctionObject* map_fn = nullptr;
if (!vm.argument(1).is_undefined()) {
auto callback = vm.argument(1);
if (!callback.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAFunction, callback.to_string_without_side_effects());
return {};
}
map_fn = &callback.as_function();
}
auto this_arg = vm.argument(2);
auto items = vm.argument(0);
auto using_iterator = TRY_OR_DISCARD(items.get_method(global_object, *vm.well_known_symbol_iterator()));
if (using_iterator) {
Value array;
if (constructor.is_constructor()) {
array = vm.construct(constructor.as_function(), constructor.as_function(), {});
if (vm.exception())
return {};
} else {
array = Array::create(global_object, 0);
}
auto iterator = get_iterator(global_object, items, IteratorHint::Sync, using_iterator);
if (vm.exception())
return {};
auto& array_object = array.as_object();
size_t k = 0;
while (true) {
if (k >= MAX_ARRAY_LIKE_INDEX) {
vm.throw_exception<TypeError>(global_object, ErrorType::ArrayMaxSize);
iterator_close(*iterator);
return {};
}
auto next = iterator_step(global_object, *iterator);
if (vm.exception())
return {};
if (!next) {
TRY_OR_DISCARD(array_object.set(vm.names.length, Value(k), Object::ShouldThrowExceptions::Yes));
return array;
}
auto next_value = iterator_value(global_object, *next);
if (vm.exception())
return {};
Value mapped_value;
if (map_fn) {
auto mapped_value_or_error = vm.call(*map_fn, this_arg, next_value, Value(k));
if (mapped_value_or_error.is_error()) {
iterator_close(*iterator);
return {};
}
mapped_value = mapped_value_or_error.release_value();
} else {
mapped_value = next_value;
}
auto result_or_error = array_object.create_data_property_or_throw(k, mapped_value);
if (result_or_error.is_error()) {
iterator_close(*iterator);
return {};
}
++k;
}
}
auto* array_like = MUST(items.to_object(global_object));
auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *array_like));
Value array;
if (constructor.is_constructor()) {
MarkedValueList arguments(vm.heap());
arguments.empend(length);
array = vm.construct(constructor.as_function(), constructor.as_function(), move(arguments));
if (vm.exception())
return {};
} else {
array = Array::create(global_object, length);
if (vm.exception())
return {};
}
auto& array_object = array.as_object();
for (size_t k = 0; k < length; ++k) {
auto k_value = TRY_OR_DISCARD(array_like->get(k));
Value mapped_value;
if (map_fn)
mapped_value = TRY_OR_DISCARD(vm.call(*map_fn, this_arg, k_value, Value(k)));
else
mapped_value = k_value;
TRY_OR_DISCARD(array_object.create_data_property_or_throw(k, mapped_value));
}
TRY_OR_DISCARD(array_object.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_OR_DISCARD(value.is_array(global_object)));
}
// 23.1.2.3 Array.of ( ...items ), https://tc39.es/ecma262/#sec-array.of
JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::of)
{
auto this_value = vm.this_value(global_object);
Value array;
if (this_value.is_constructor()) {
MarkedValueList arguments(vm.heap());
arguments.empend(vm.argument_count());
array = vm.construct(this_value.as_function(), this_value.as_function(), move(arguments));
if (vm.exception())
return {};
} else {
array = Array::create(global_object, vm.argument_count());
if (vm.exception())
return {};
}
auto& array_object = array.as_object();
for (size_t k = 0; k < vm.argument_count(); ++k)
TRY_OR_DISCARD(array_object.create_data_property_or_throw(k, vm.argument(k)));
TRY_OR_DISCARD(array_object.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(global_object);
}
}
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