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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/Heap/Heap.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, *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_property(vm.names.prototype, global_object.array_prototype(), 0);
define_property(vm.names.length, Value(1), Attribute::Configurable);
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);
}
// 23.1.1.1 Array ( ...values ), https://tc39.es/ecma262/#sec-array
Value ArrayConstructor::call()
{
if (vm().argument_count() <= 0)
return Array::create(global_object());
if (vm().argument_count() == 1 && vm().argument(0).is_number()) {
auto array_length_value = vm().argument(0);
if (!array_length_value.is_integral_number() || array_length_value.as_i32() < 0) {
vm().throw_exception<RangeError>(global_object(), ErrorType::InvalidLength, "array");
return {};
}
auto* array = Array::create(global_object());
array->indexed_properties().set_array_like_size(array_length_value.as_i32());
return array;
}
auto* array = Array::create(global_object());
for (size_t i = 0; i < vm().argument_count(); ++i)
array->indexed_properties().append(vm().argument(i));
return array;
}
// 23.1.1.1 Array ( ...values ), https://tc39.es/ecma262/#sec-array
Value ArrayConstructor::construct(Function&)
{
return call();
}
// 23.1.2.1 Array.from ( items [ , mapfn [ , thisArg ] ] ), https://tc39.es/ecma262/#sec-array.from
JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::from)
{
auto value = vm.argument(0);
auto object = value.to_object(global_object);
if (!object)
return {};
auto* array = Array::create(global_object);
Function* 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);
// Array.from() lets you create Arrays from:
if (auto size = object->indexed_properties().array_like_size()) {
// * array-like objects (objects with a length property and indexed elements)
MarkedValueList elements(vm.heap());
elements.ensure_capacity(size);
for (size_t i = 0; i < size; ++i) {
if (map_fn) {
auto element = object->get(i);
if (vm.exception())
return {};
auto map_fn_result = vm.call(*map_fn, this_arg, element, Value((i32)i));
if (vm.exception())
return {};
elements.append(map_fn_result);
} else {
elements.append(object->get(i));
if (vm.exception())
return {};
}
}
array->set_indexed_property_elements(move(elements));
} else {
// * iterable objects
i32 i = 0;
get_iterator_values(global_object, value, [&](Value element) {
if (vm.exception())
return IterationDecision::Break;
if (map_fn) {
auto map_fn_result = vm.call(*map_fn, this_arg, element, Value(i));
i++;
if (vm.exception())
return IterationDecision::Break;
array->indexed_properties().append(map_fn_result);
} else {
array->indexed_properties().append(element);
}
return IterationDecision::Continue;
});
if (vm.exception())
return {};
}
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(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* array = Array::create(global_object);
for (size_t i = 0; i < vm.argument_count(); ++i)
array->indexed_properties().append(vm.argument(i));
return array;
}
// 23.1.2.5 get Array [ @@species ], https://tc39.es/ecma262/#sec-get-array-@@species
JS_DEFINE_NATIVE_GETTER(ArrayConstructor::symbol_species_getter)
{
return vm.this_value(global_object);
}
}
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