1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibJS/Runtime/Object.h>
namespace JS {
struct Variable {
Value value;
DeclarationKind declaration_kind;
};
#define JS_ENVIRONMENT(class_, base_class) \
public: \
using Base = base_class; \
virtual char const* class_name() const override { return #class_; }
class Environment : public Cell {
public:
GlobalObject& global_object() { return *m_global_object; }
GlobalObject const& global_object() const { return *m_global_object; }
virtual void initialize(GlobalObject&) override;
virtual Optional<Variable> get_from_environment(FlyString const&) const = 0;
virtual bool put_into_environment(FlyString const&, Variable) = 0;
virtual bool delete_from_environment(FlyString const&) = 0;
virtual bool has_this_binding() const { return false; }
virtual Value get_this_binding(GlobalObject&) const { return {}; }
virtual Object* with_base_object() const { return nullptr; }
virtual bool has_binding([[maybe_unused]] FlyString const& name) const { return false; }
virtual void create_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool can_be_deleted) { }
virtual void create_immutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { }
virtual void initialize_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value) { }
virtual void set_mutable_binding(GlobalObject&, [[maybe_unused]] FlyString const& name, Value, [[maybe_unused]] bool strict) { }
virtual Value get_binding_value(GlobalObject&, [[maybe_unused]] FlyString const& name, [[maybe_unused]] bool strict) { return {}; }
virtual bool delete_binding(GlobalObject&, [[maybe_unused]] FlyString const& name) { return false; }
// [[OuterEnv]]
Environment* outer_environment() { return m_outer_environment; }
Environment const* outer_environment() const { return m_outer_environment; }
virtual bool is_global_environment() const { return false; }
virtual bool is_declarative_environment() const { return false; }
virtual bool is_function_environment() const { return false; }
template<typename T>
bool fast_is() const = delete;
virtual char const* class_name() const override { return "Environment"; }
protected:
explicit Environment(Environment* parent);
virtual void visit_edges(Visitor&) override;
private:
virtual bool is_environment() const final { return true; }
GlobalObject* m_global_object { nullptr };
Environment* m_outer_environment { nullptr };
};
}
|
