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LibJS: Add the Map built-in object

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Idan Horowitz 2021-06-12 23:54:40 +03:00 • committed by Linus Groh
parent f9d58ec0b4
commit a96ac8bd56
11 changed files with 335 additions and 0 deletions
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85
Userland/Libraries/LibJS/Runtime/MapConstructor.cpp Normal file
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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorOperations.h>
#include <LibJS/Runtime/Map.h>
#include <LibJS/Runtime/MapConstructor.h>
namespace JS {
MapConstructor::MapConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.Map, *global_object.function_prototype())
{
}
void MapConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
define_property(vm.names.prototype, global_object.map_prototype(), 0);
define_property(vm.names.length, Value(0), Attribute::Configurable);
define_native_accessor(vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
}
MapConstructor::~MapConstructor()
{
}
Value MapConstructor::call()
{
auto& vm = this->vm();
vm.throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.Map);
return {};
}
// 24.1.1.1 Map ( [ iterable ] ), https://tc39.es/ecma262/#sec-map-iterable
Value MapConstructor::construct(Function&)
{
auto& vm = this->vm();
// FIXME: Use OrdinaryCreateFromConstructor(newTarget, "%Map.prototype%")
auto* map = Map::create(global_object());
if (vm.argument(0).is_nullish())
return map;
auto adder = map->get(vm.names.set);
if (vm.exception())
return {};
if (!adder.is_function()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::NotAFunction, "'set' property of Map");
return {};
}
get_iterator_values(global_object(), vm.argument(0), [&](Value iterator_value) {
if (vm.exception())
return IterationDecision::Break;
if (!iterator_value.is_object()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::NotAnObject, String::formatted("Iterator value {}", iterator_value.to_string_without_side_effects()));
return IterationDecision::Break;
}
auto key = iterator_value.as_object().get(0).value_or(js_undefined());
if (vm.exception())
return IterationDecision::Break;
auto value = iterator_value.as_object().get(1).value_or(js_undefined());
if (vm.exception())
return IterationDecision::Break;
(void)vm.call(adder.as_function(), Value(map), key, value);
return vm.exception() ? IterationDecision::Break : IterationDecision::Continue;
});
if (vm.exception())
return {};
return map;
}
// 24.1.2.2 get Map [ @@species ], https://tc39.es/ecma262/#sec-get-map-@@species
JS_DEFINE_NATIVE_GETTER(MapConstructor::symbol_species_getter)
{
return vm.this_value(global_object);
}
}