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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <LibJS/Runtime/Environment.h>
#include <LibJS/Runtime/EnvironmentCoordinate.h>
#include <LibJS/Runtime/ExecutionContext.h>
#include <LibJS/Runtime/PropertyName.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
class Reference {
public:
enum class BaseType : u8 {
Unresolvable,
Value,
Environment,
};
Reference() { }
Reference(BaseType type, PropertyName name, bool strict)
: m_base_type(type)
, m_name(move(name))
, m_strict(strict)
{
}
Reference(Value base, PropertyName name, Value this_value, bool strict = false)
: m_base_type(BaseType::Value)
, m_base_value(base)
, m_name(move(name))
, m_this_value(this_value)
, m_strict(strict)
{
if (base.is_nullish()) {
m_base_type = BaseType::Unresolvable;
m_base_value = {};
m_this_value = {};
m_name = {};
}
}
Reference(Environment& base, FlyString referenced_name, bool strict = false, Optional<EnvironmentCoordinate> environment_coordinate = {})
: m_base_type(BaseType::Environment)
, m_base_environment(&base)
, m_name(move(referenced_name))
, m_strict(strict)
, m_environment_coordinate(move(environment_coordinate))
{
}
Value base() const
{
VERIFY(m_base_type == BaseType::Value);
return m_base_value;
}
Environment& base_environment() const
{
VERIFY(m_base_type == BaseType::Environment);
return *m_base_environment;
}
PropertyName const& name() const { return m_name; }
bool is_strict() const { return m_strict; }
// 6.2.4.2 IsUnresolvableReference ( V ), https://tc39.es/ecma262/#sec-isunresolvablereference
bool is_unresolvable() const { return m_base_type == BaseType::Unresolvable; }
// 6.2.4.1 IsPropertyReference ( V ), https://tc39.es/ecma262/#sec-ispropertyreference
bool is_property_reference() const
{
if (is_unresolvable())
return false;
if (m_base_type == BaseType::Environment)
return false;
if (m_base_value.is_boolean() || m_base_value.is_string() || m_base_value.is_symbol() || m_base_value.is_bigint() || m_base_value.is_number() || m_base_value.is_object())
return true;
return false;
}
// 6.2.4.7 GetThisValue ( V ), https://tc39.es/ecma262/#sec-getthisvalue
Value get_this_value() const
{
VERIFY(is_property_reference());
if (is_super_reference())
return m_this_value;
return m_base_value;
}
// 6.2.4.3 IsSuperReference ( V ), https://tc39.es/ecma262/#sec-issuperreference
bool is_super_reference() const
{
return !m_this_value.is_empty();
}
// Note: Non-standard helper.
bool is_environment_reference() const
{
return m_base_type == BaseType::Environment;
}
void initialize_referenced_binding(GlobalObject& global_object, Value value) const
{
VERIFY(!is_unresolvable());
VERIFY(m_base_type == BaseType::Environment);
m_base_environment->initialize_binding(global_object, m_name.as_string(), value);
}
void put_value(GlobalObject&, Value);
Value get_value(GlobalObject&) const;
bool delete_(GlobalObject&);
String to_string() const;
bool is_valid_reference() const { return m_name.is_valid(); }
Optional<EnvironmentCoordinate> environment_coordinate() const { return m_environment_coordinate; }
private:
void throw_reference_error(GlobalObject&) const;
BaseType m_base_type { BaseType::Unresolvable };
union {
Value m_base_value {};
mutable Environment* m_base_environment;
};
PropertyName m_name;
Value m_this_value;
bool m_strict { false };
Optional<EnvironmentCoordinate> m_environment_coordinate;
};
}
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