-
Notifications
You must be signed in to change notification settings - Fork 6
Expand file tree
/
Copy pathPyMemberDescriptor.cpp
More file actions
116 lines (96 loc) · 3.45 KB
/
Copy pathPyMemberDescriptor.cpp
File metadata and controls
116 lines (96 loc) · 3.45 KB
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
#include "PyMemberDescriptor.hpp"
#include "MemoryError.hpp"
#include "PyString.hpp"
#include "PyType.hpp"
#include "TypeError.hpp"
#include "interpreter/Interpreter.hpp"
#include "types/api.hpp"
#include "types/builtin.hpp"
#include "vm/VM.hpp"
namespace py {
template<> PyMemberDescriptor *as(PyObject *obj)
{
if (obj->type() == types::member_descriptor()) {
return static_cast<PyMemberDescriptor *>(obj);
}
return nullptr;
}
template<> const PyMemberDescriptor *as(const PyObject *obj)
{
if (obj->type() == types::member_descriptor()) {
return static_cast<const PyMemberDescriptor *>(obj);
}
return nullptr;
}
PyMemberDescriptor::PyMemberDescriptor(PyType *type) : PyBaseObject(type) {}
PyMemberDescriptor::PyMemberDescriptor(PyString *name,
PyType *underlying_type,
std::function<PyResult<PyObject *>(PyObject *)> member,
std::function<PyResult<std::monostate>(PyObject *, PyObject *)> setter)
: PyBaseObject(types::BuiltinTypes::the().member_descriptor()), m_name(std::move(name)),
m_underlying_type(underlying_type), m_member_accessor(std::move(member)),
m_member_setter(std::move(setter))
{}
PyResult<PyMemberDescriptor *> PyMemberDescriptor::create(PyString *name,
PyType *underlying_type,
std::function<PyResult<PyObject *>(PyObject *)> member,
std::function<PyResult<std::monostate>(PyObject *, PyObject *)> setter)
{
auto *obj = VirtualMachine::the().heap().allocate<PyMemberDescriptor>(
name, underlying_type, member, setter);
if (!obj) { return Err(memory_error(sizeof(PyMemberDescriptor))); }
return Ok(obj);
}
void PyMemberDescriptor::visit_graph(Visitor &visitor)
{
PyObject::visit_graph(visitor);
visitor.visit(*m_name);
visitor.visit(*m_underlying_type);
}
std::string PyMemberDescriptor::to_string() const
{
return fmt::format(
"<member '{}' of '{}' objects>", m_name->to_string(), m_underlying_type->name());
}
PyResult<PyObject *> PyMemberDescriptor::__repr__() const { return PyString::create(to_string()); }
PyResult<PyObject *> PyMemberDescriptor::__get__(PyObject *instance, PyObject * /*owner*/) const
{
if (!instance) { return Ok(const_cast<PyMemberDescriptor *>(this)); }
if ((instance->type() != m_underlying_type)
&& !instance->type()->issubclass(m_underlying_type)) {
return Err(
type_error("descriptor '{}' for '{}' objects "
"doesn't apply to a '{}' object",
m_name->value(),
m_underlying_type->underlying_type().__name__,
instance->type()->underlying_type().__name__));
}
return m_member_accessor(instance);
}
PyResult<std::monostate> PyMemberDescriptor::__set__(PyObject *obj, PyObject *value)
{
if (obj->type() != m_underlying_type && !obj->type()->issubclass(m_underlying_type)) {
return Err(type_error("descriptor '{}' for '{}' objects doesn't apply to a '{}' object",
m_name->value(),
m_underlying_type->underlying_type().__name__,
obj->type()->underlying_type().__name__));
}
return m_member_setter(obj, value);
}
PyType *PyMemberDescriptor::static_type() const { return types::member_descriptor(); }
namespace {
std::once_flag method_wrapper_flag;
std::unique_ptr<TypePrototype> register_member_descriptor()
{
return std::move(klass<PyMemberDescriptor>("member_descriptor").type);
}
}// namespace
std::function<std::unique_ptr<TypePrototype>()> PyMemberDescriptor::type_factory()
{
return [] {
static std::unique_ptr<TypePrototype> type = nullptr;
std::call_once(method_wrapper_flag, []() { type = register_member_descriptor(); });
return std::move(type);
};
}
}// namespace py