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9d49a5478a
This patch adds the concept of variable bindings to the various environment record classes. The bindings are not yet hooked up to anything, this is just fleshing out all the operations. Most of this is following the spec exactly, but in a few cases we are missing the requisite abstract operations to do the exact right thing. I've added FIXME's in those cases where I noticed it.
108 lines
3.2 KiB
C++
108 lines
3.2 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/ObjectEnvironmentRecord.h>
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namespace JS {
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ObjectEnvironmentRecord::ObjectEnvironmentRecord(Object& object, EnvironmentRecord* parent_scope)
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: EnvironmentRecord(parent_scope)
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, m_object(object)
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{
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}
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void ObjectEnvironmentRecord::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(&m_object);
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}
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Optional<Variable> ObjectEnvironmentRecord::get_from_environment_record(FlyString const& name) const
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{
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auto value = m_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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void ObjectEnvironmentRecord::put_into_environment_record(FlyString const& name, Variable variable)
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{
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m_object.put(name, variable.value);
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}
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bool ObjectEnvironmentRecord::delete_from_environment_record(FlyString const& name)
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{
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return m_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 ObjectEnvironmentRecord::has_binding(FlyString const& name) const
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{
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bool found_binding = m_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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void ObjectEnvironmentRecord::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_object.define_property(name, js_undefined(), attributes, true);
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}
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void ObjectEnvironmentRecord::create_immutable_binding(GlobalObject&, FlyString const&, bool)
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{
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VERIFY_NOT_REACHED();
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}
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void ObjectEnvironmentRecord::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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void ObjectEnvironmentRecord::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_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_object.put(name, value);
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}
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Value ObjectEnvironmentRecord::get_binding_value(GlobalObject& global_object, FlyString const& name, bool strict)
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{
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if (!m_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_object.get(name);
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}
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bool ObjectEnvironmentRecord::delete_binding(GlobalObject&, FlyString const& name)
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{
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return m_object.delete_property(name);
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}
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}
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