80170887db
This code is non-conforming and will eventually get cleaned out once we implement proper variable bindings. However, this will aid us in improving other parts of the code right now.
116 lines
4.1 KiB
C++
116 lines
4.1 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/AST.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/ObjectEnvironment.h>
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namespace JS {
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ObjectEnvironment::ObjectEnvironment(Object& binding_object, IsWithEnvironment is_with_environment, Environment* outer_environment)
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: Environment(outer_environment)
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, m_binding_object(binding_object)
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, m_with_environment(is_with_environment == IsWithEnvironment::Yes)
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{
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}
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void ObjectEnvironment::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(&m_binding_object);
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}
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Optional<Variable> ObjectEnvironment::get_from_environment(FlyString const& name) const
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{
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auto value = m_binding_object.get(name);
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if (value.is_empty())
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return {};
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return Variable { value, DeclarationKind::Var };
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}
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bool ObjectEnvironment::put_into_environment(FlyString const& name, Variable variable)
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{
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return m_binding_object.put(name, variable.value);
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}
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bool ObjectEnvironment::delete_from_environment(FlyString const& name)
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{
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return m_binding_object.delete_property(name);
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}
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// 9.1.1.2.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-object-environment-records-hasbinding-n
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bool ObjectEnvironment::has_binding(FlyString const& name) const
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{
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bool found_binding = m_binding_object.has_property(name);
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if (!found_binding)
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return false;
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// FIXME: Implement the rest of this operation.
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return true;
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}
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// 9.1.1.2.2 CreateMutableBinding ( N, D ), https://tc39.es/ecma262/#sec-object-environment-records-createmutablebinding-n-d
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void ObjectEnvironment::create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted)
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{
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PropertyAttributes attributes;
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attributes.set_enumerable();
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attributes.set_has_enumerable();
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attributes.set_writable();
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attributes.set_has_writable();
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attributes.set_has_configurable();
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if (can_be_deleted)
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attributes.set_configurable();
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m_binding_object.define_property(name, js_undefined(), attributes, true);
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}
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// 9.1.1.2.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-object-environment-records-createimmutablebinding-n-s
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void ObjectEnvironment::create_immutable_binding(GlobalObject&, FlyString const&, bool)
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{
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// "The CreateImmutableBinding concrete method of an object Environment Record is never used within this specification."
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VERIFY_NOT_REACHED();
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}
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// 9.1.1.2.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-object-environment-records-initializebinding-n-v
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void ObjectEnvironment::initialize_binding(GlobalObject& global_object, FlyString const& name, Value value)
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{
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set_mutable_binding(global_object, name, value, false);
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}
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// 9.1.1.2.5 SetMutableBinding ( N, V, S ), https://tc39.es/ecma262/#sec-object-environment-records-setmutablebinding-n-v-s
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void ObjectEnvironment::set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value, bool strict)
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{
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bool still_exists = m_binding_object.has_property(name);
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if (!still_exists && strict) {
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global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
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return;
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}
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// FIXME: This should use the Set abstract operation.
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// FIXME: Set returns a bool, so this may need to return a bool as well.
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m_binding_object.put(name, value);
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}
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// 9.1.1.2.6 GetBindingValue ( N, S ), https://tc39.es/ecma262/#sec-object-environment-records-getbindingvalue-n-s
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Value ObjectEnvironment::get_binding_value(GlobalObject& global_object, FlyString const& name, bool strict)
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{
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if (!m_binding_object.has_property(name)) {
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if (!strict)
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return js_undefined();
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global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
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return {};
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}
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// FIXME: This should use the Get abstract operation.
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return m_binding_object.get(name);
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}
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// 9.1.1.2.7 DeleteBinding ( N ), https://tc39.es/ecma262/#sec-object-environment-records-deletebinding-n
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bool ObjectEnvironment::delete_binding(GlobalObject&, FlyString const& name)
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{
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return m_binding_object.delete_property(name);
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}
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}
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