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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
* 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);
(void)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;
};
}
|
