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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/DeclarativeEnvironment.h>
namespace JS {
class FunctionEnvironment final : public DeclarativeEnvironment {
JS_ENVIRONMENT(FunctionEnvironment, DeclarativeEnvironment);
public:
enum class ThisBindingStatus : u8 {
Lexical,
Initialized,
Uninitialized,
};
FunctionEnvironment(Environment* parent_scope, HashMap<FlyString, Variable> variables);
virtual ~FunctionEnvironment() override;
// [[ThisValue]]
Value this_value() const { return m_this_value; }
void set_this_value(Value value) { m_this_value = value; }
// Not a standard operation.
void replace_this_binding(Value this_value) { m_this_value = this_value; }
// [[ThisBindingStatus]]
ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
void set_this_binding_status(ThisBindingStatus status) { m_this_binding_status = status; }
// [[FunctionObject]]
FunctionObject& function_object() { return *m_function_object; }
FunctionObject const& function_object() const { return *m_function_object; }
void set_function_object(FunctionObject& function) { m_function_object = &function; }
// [[NewTarget]]
Value new_target() const { return m_new_target; }
void set_new_target(Value new_target) { m_new_target = new_target; }
// Abstract operations
Value get_super_base() const;
bool has_super_binding() const;
virtual bool has_this_binding() const override;
virtual Value get_this_binding(GlobalObject&) const override;
Value bind_this_value(GlobalObject&, Value);
private:
virtual bool is_function_environment() const override { return true; }
virtual void visit_edges(Visitor&) override;
Value m_this_value;
ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized };
FunctionObject* m_function_object { nullptr };
Value m_new_target;
};
template<>
inline bool Environment::fast_is<FunctionEnvironment>() const { return is_function_environment(); }
}
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