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/*
* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Function.h>
#include <AK/Result.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/BoundFunction.h>
#include <LibJS/Runtime/ErrorTypes.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PropertyName.h>
namespace JS {
// Used in various abstract operations to make it obvious when a non-optional return value must be discarded.
static constexpr double INVALID { 0 };
// 7.2.1 RequireObjectCoercible ( argument ), https://tc39.es/ecma262/#sec-requireobjectcoercible
Value require_object_coercible(GlobalObject& global_object, Value value)
{
auto& vm = global_object.vm();
if (value.is_nullish()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotObjectCoercible, value.to_string_without_side_effects());
return {};
}
return value;
}
// 7.3.10 GetMethod ( V, P ), https://tc39.es/ecma262/#sec-getmethod
Function* get_method(GlobalObject& global_object, Value value, PropertyName const& property_name)
{
auto& vm = global_object.vm();
auto* object = value.to_object(global_object);
if (vm.exception())
return nullptr;
auto property_value = object->get(property_name);
if (vm.exception())
return nullptr;
if (property_value.is_empty() || property_value.is_nullish())
return nullptr;
if (!property_value.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAFunction, property_value.to_string_without_side_effects());
return nullptr;
}
return &property_value.as_function();
}
// 7.3.18 LengthOfArrayLike ( obj ), https://tc39.es/ecma262/#sec-lengthofarraylike
size_t length_of_array_like(GlobalObject& global_object, Object const& object)
{
auto& vm = global_object.vm();
auto result = object.get(vm.names.length).value_or(js_undefined());
if (vm.exception())
return INVALID;
return result.to_length(global_object);
}
// 7.3.19 CreateListFromArrayLike ( obj [ , elementTypes ] ), https://tc39.es/ecma262/#sec-createlistfromarraylike
MarkedValueList create_list_from_array_like(GlobalObject& global_object, Value value, AK::Function<Result<void, ErrorType>(Value)> check_value)
{
auto& vm = global_object.vm();
auto& heap = global_object.heap();
if (!value.is_object()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObject, value.to_string_without_side_effects());
return MarkedValueList { heap };
}
auto& array_like = value.as_object();
auto length = length_of_array_like(global_object, array_like);
if (vm.exception())
return MarkedValueList { heap };
auto list = MarkedValueList { heap };
for (size_t i = 0; i < length; ++i) {
auto index_name = String::number(i);
auto next = array_like.get(index_name).value_or(js_undefined());
if (vm.exception())
return MarkedValueList { heap };
if (check_value) {
auto result = check_value(next);
if (result.is_error()) {
vm.throw_exception<TypeError>(global_object, result.release_error());
return MarkedValueList { heap };
}
}
list.append(next);
}
return list;
}
// 7.3.22 SpeciesConstructor ( O, defaultConstructor ), https://tc39.es/ecma262/#sec-speciesconstructor
Function* species_constructor(GlobalObject& global_object, Object const& object, Function& default_constructor)
{
auto& vm = global_object.vm();
auto constructor = object.get(vm.names.constructor).value_or(js_undefined());
if (vm.exception())
return nullptr;
if (constructor.is_undefined())
return &default_constructor;
if (!constructor.is_object()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAConstructor, constructor.to_string_without_side_effects());
return nullptr;
}
auto species = constructor.as_object().get(vm.well_known_symbol_species()).value_or(js_undefined());
if (species.is_nullish())
return &default_constructor;
if (species.is_constructor())
return &species.as_function();
vm.throw_exception<TypeError>(global_object, ErrorType::NotAConstructor, species.to_string_without_side_effects());
return nullptr;
}
}
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