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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/AST.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/ObjectEnvironment.h>
namespace JS {
ObjectEnvironment::ObjectEnvironment(Object& binding_object, IsWithEnvironment is_with_environment, Environment* outer_environment)
: Environment(outer_environment)
, m_binding_object(binding_object)
, m_with_environment(is_with_environment == IsWithEnvironment::Yes)
{
}
void ObjectEnvironment::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(&m_binding_object);
}
Optional<Variable> ObjectEnvironment::get_from_environment(FlyString const& name) const
{
if (!m_binding_object.storage_has(name))
return {};
auto value = m_binding_object.get(name);
return Variable { value, DeclarationKind::Var };
}
bool ObjectEnvironment::put_into_environment(FlyString const& name, Variable variable)
{
return m_binding_object.set(name, variable.value, Object::ShouldThrowExceptions::No);
}
bool ObjectEnvironment::delete_from_environment(FlyString const& name)
{
return m_binding_object.internal_delete(name);
}
// 9.1.1.2.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-object-environment-records-hasbinding-n
bool ObjectEnvironment::has_binding(FlyString const& name) const
{
auto& vm = this->vm();
bool found_binding = m_binding_object.has_property(name);
if (vm.exception())
return {};
if (!found_binding)
return false;
if (!m_with_environment)
return true;
auto unscopables = m_binding_object.get(*vm.well_known_symbol_unscopables());
if (vm.exception())
return {};
if (unscopables.is_object()) {
auto blocked = unscopables.as_object().get(name);
if (vm.exception())
return {};
if (blocked.to_boolean())
return false;
}
return true;
}
// 9.1.1.2.2 CreateMutableBinding ( N, D ), https://tc39.es/ecma262/#sec-object-environment-records-createmutablebinding-n-d
void ObjectEnvironment::create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted)
{
// 1. Let bindingObject be envRec.[[BindingObject]].
// 2. Return ? DefinePropertyOrThrow(bindingObject, N, PropertyDescriptor { [[Value]]: undefined, [[Writable]]: true, [[Enumerable]]: true, [[Configurable]]: D }).
m_binding_object.define_property_or_throw(name, { .value = js_undefined(), .writable = true, .enumerable = true, .configurable = can_be_deleted });
}
// 9.1.1.2.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-object-environment-records-createimmutablebinding-n-s
void ObjectEnvironment::create_immutable_binding(GlobalObject&, FlyString const&, bool)
{
// "The CreateImmutableBinding concrete method of an object Environment Record is never used within this specification."
VERIFY_NOT_REACHED();
}
// 9.1.1.2.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-object-environment-records-initializebinding-n-v
void ObjectEnvironment::initialize_binding(GlobalObject& global_object, FlyString const& name, Value value)
{
set_mutable_binding(global_object, name, value, false);
}
// 9.1.1.2.5 SetMutableBinding ( N, V, S ), https://tc39.es/ecma262/#sec-object-environment-records-setmutablebinding-n-v-s
void ObjectEnvironment::set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value, bool strict)
{
auto& vm = this->vm();
bool still_exists = m_binding_object.has_property(name);
if (vm.exception())
return;
if (!still_exists && strict) {
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
return;
}
m_binding_object.set(name, value, strict ? Object::ShouldThrowExceptions::Yes : Object::ShouldThrowExceptions::No);
}
// 9.1.1.2.6 GetBindingValue ( N, S ), https://tc39.es/ecma262/#sec-object-environment-records-getbindingvalue-n-s
Value ObjectEnvironment::get_binding_value(GlobalObject& global_object, FlyString const& name, bool strict)
{
auto& vm = this->vm();
auto value = m_binding_object.has_property(name);
if (vm.exception())
return {};
if (!value) {
if (!strict)
return js_undefined();
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
return {};
}
return m_binding_object.get(name);
}
// 9.1.1.2.7 DeleteBinding ( N ), https://tc39.es/ecma262/#sec-object-environment-records-deletebinding-n
bool ObjectEnvironment::delete_binding(GlobalObject&, FlyString const& name)
{
return m_binding_object.internal_delete(name);
}
}
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