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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
DeclarativeEnvironment::DeclarativeEnvironment()
: Environment(nullptr)
{
}
DeclarativeEnvironment::DeclarativeEnvironment(Environment* parent_scope)
: Environment(parent_scope)
{
}
DeclarativeEnvironment::DeclarativeEnvironment(HashMap<FlyString, Variable> variables, Environment* parent_scope)
: Environment(parent_scope)
, m_variables(move(variables))
{
}
DeclarativeEnvironment::~DeclarativeEnvironment()
{
}
void DeclarativeEnvironment::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
for (auto& it : m_variables)
visitor.visit(it.value.value);
for (auto& it : m_bindings)
visitor.visit(it.value.value);
}
Optional<Variable> DeclarativeEnvironment::get_from_environment(FlyString const& name) const
{
return m_variables.get(name);
}
bool DeclarativeEnvironment::put_into_environment(FlyString const& name, Variable variable)
{
m_variables.set(name, variable);
return true;
}
bool DeclarativeEnvironment::delete_from_environment(FlyString const& name)
{
return m_variables.remove(name);
}
// 9.1.1.1.1 HasBinding ( N ), https://tc39.es/ecma262/#sec-declarative-environment-records-hasbinding-n
bool DeclarativeEnvironment::has_binding(FlyString const& name) const
{
return m_bindings.contains(name);
}
// 9.1.1.1.2 CreateMutableBinding ( N, D ), https://tc39.es/ecma262/#sec-declarative-environment-records-createmutablebinding-n-d
void DeclarativeEnvironment::create_mutable_binding(GlobalObject&, FlyString const& name, bool can_be_deleted)
{
auto result = m_bindings.set(name,
Binding {
.value = {},
.strict = false,
.mutable_ = true,
.can_be_deleted = can_be_deleted,
.initialized = false,
});
VERIFY(result == AK::HashSetResult::InsertedNewEntry);
}
// 9.1.1.1.3 CreateImmutableBinding ( N, S ), https://tc39.es/ecma262/#sec-declarative-environment-records-createimmutablebinding-n-s
void DeclarativeEnvironment::create_immutable_binding(GlobalObject&, FlyString const& name, bool strict)
{
auto result = m_bindings.set(name,
Binding {
.value = {},
.strict = strict,
.mutable_ = false,
.can_be_deleted = false,
.initialized = false,
});
VERIFY(result == AK::HashSetResult::InsertedNewEntry);
}
// 9.1.1.1.4 InitializeBinding ( N, V ), https://tc39.es/ecma262/#sec-declarative-environment-records-initializebinding-n-v
void DeclarativeEnvironment::initialize_binding(GlobalObject&, FlyString const& name, Value value)
{
auto it = m_bindings.find(name);
VERIFY(it != m_bindings.end());
VERIFY(it->value.initialized == false);
it->value.value = value;
it->value.initialized = true;
}
// 9.1.1.1.5 SetMutableBinding ( N, V, S ), https://tc39.es/ecma262/#sec-declarative-environment-records-setmutablebinding-n-v-s
void DeclarativeEnvironment::set_mutable_binding(GlobalObject& global_object, FlyString const& name, Value value, bool strict)
{
auto it = m_bindings.find(name);
if (it == m_bindings.end()) {
if (strict) {
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, name);
return;
}
create_mutable_binding(global_object, name, true);
initialize_binding(global_object, name, value);
return;
}
if (it->value.strict)
strict = true;
if (!it->value.initialized) {
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::BindingNotInitialized, name);
return;
}
if (it->value.mutable_) {
it->value.value = value;
} else {
if (strict) {
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::InvalidAssignToConst);
}
}
}
// 9.1.1.1.6 GetBindingValue ( N, S ), https://tc39.es/ecma262/#sec-declarative-environment-records-getbindingvalue-n-s
Value DeclarativeEnvironment::get_binding_value(GlobalObject& global_object, FlyString const& name, bool)
{
auto it = m_bindings.find(name);
VERIFY(it != m_bindings.end());
if (!it->value.initialized) {
global_object.vm().throw_exception<ReferenceError>(global_object, ErrorType::BindingNotInitialized, name);
return {};
}
return it->value.value;
}
// 9.1.1.1.7 DeleteBinding ( N ), https://tc39.es/ecma262/#sec-declarative-environment-records-deletebinding-n
bool DeclarativeEnvironment::delete_binding(GlobalObject&, FlyString const& name)
{
auto it = m_bindings.find(name);
VERIFY(it != m_bindings.end());
if (!it->value.can_be_deleted)
return false;
m_bindings.remove(it);
return true;
}
}
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