|
1
|
|
|
"""Descriptor Inspector. |
|
2
|
|
|
|
|
3
|
|
|
Wrapper around objects, helps expose descriptor protocol. |
|
4
|
|
|
|
|
5
|
|
|
""" |
|
6
|
|
|
|
|
7
|
6 |
|
from .flags import ENABLE_SET_NAME |
|
8
|
6 |
|
from .inspector import _Inspector |
|
9
|
|
|
|
|
10
|
|
|
|
|
11
|
6 |
|
class DescriptorInspector(_Inspector): |
|
12
|
|
|
|
|
13
|
|
|
"""Wrapper around objects. Provides access to descriptor protocol.""" |
|
14
|
|
|
|
|
15
|
6 |
|
__slots__ = () |
|
16
|
|
|
|
|
17
|
6 |
|
def __new__(cls, obj): |
|
18
|
6 |
|
return super().__new__(cls, obj, mro=type(obj).__mro__) |
|
19
|
|
|
|
|
20
|
6 |
|
@property |
|
21
|
|
|
def has_get(self): |
|
22
|
|
|
"""Return whether self.object's mro provides __get__.""" |
|
23
|
6 |
|
return '__get__' in self.dict |
|
24
|
|
|
|
|
25
|
6 |
|
@property |
|
26
|
|
|
def has_set(self): |
|
27
|
|
|
"""Return whether self.object's mro provides __set__.""" |
|
28
|
6 |
|
return '__set__' in self.dict |
|
29
|
|
|
|
|
30
|
6 |
|
@property |
|
31
|
|
|
def has_delete(self): |
|
32
|
|
|
"""Return whether self.object's mro provides __delete__.""" |
|
33
|
6 |
|
return '__delete__' in self.dict |
|
34
|
|
|
|
|
35
|
6 |
|
if ENABLE_SET_NAME: |
|
36
|
2 |
|
@property |
|
37
|
|
|
def has_set_name(self): |
|
38
|
|
|
"""Return whether self.object's mro provides __set_name__.""" |
|
39
|
2 |
|
return '__set_name__' in self.dict |
|
40
|
|
|
|
|
41
|
2 |
|
def set_name(self, owner, name): |
|
42
|
|
|
"""Call __set_name__, bypassing descriptor protocol.""" |
|
43
|
2 |
|
self.get_as_attribute('__set_name__')(self.object, owner, name) |
|
44
|
|
|
|
|
45
|
2 |
|
@property |
|
46
|
|
|
def has_non_data(self): |
|
47
|
|
|
"""Return whether self.object's mro provides non-data methods.""" |
|
48
|
2 |
|
return self.has_get or self.has_set_name |
|
49
|
|
|
else: |
|
50
|
4 |
|
has_non_data = has_get |
|
51
|
|
|
|
|
52
|
6 |
|
@property |
|
53
|
|
|
def is_data(self): |
|
54
|
|
|
"""Return whether self.object is a data descriptor.""" |
|
55
|
6 |
|
return self.has_set or self.has_delete |
|
56
|
|
|
|
|
57
|
|
|
# I guess I don't actually have a use for this property? |
|
58
|
6 |
|
@property |
|
59
|
|
|
def is_non_data(self): |
|
60
|
|
|
"""Return whether self.object is a non-data descriptor.""" |
|
61
|
|
|
return self.has_non_data and not self.is_data |
|
62
|
|
|
|
|
63
|
6 |
|
@property |
|
64
|
|
|
def is_descriptor(self): |
|
65
|
|
|
"""Return whether self.object is a descriptor.""" |
|
66
|
6 |
|
return self.has_non_data or self.is_data |
|
67
|
|
|
|
|
68
|
6 |
|
def get(self, instance, owner): |
|
69
|
|
|
"""Return the result of __get__, bypassing descriptor protocol.""" |
|
70
|
6 |
|
return self.get_as_attribute('__get__')(self.object, instance, owner) |
|
71
|
|
|
|
|
72
|
6 |
|
def set(self, instance, value): |
|
73
|
|
|
"""Call __set__, bypassing descriptor protocol.""" |
|
74
|
6 |
|
self.get_as_attribute('__set__')(self.object, instance, value) |
|
75
|
|
|
|
|
76
|
6 |
|
def delete(self, instance): |
|
77
|
|
|
"""Call __delete__, bypassing descriptor protocol.""" |
|
78
|
|
|
self.get_as_attribute('__delete__')(self.object, instance) |
|
79
|
|
|
|
mwchase /
class-namespaces
