|
1
|
|
|
import functools |
|
2
|
|
|
import typing |
|
3
|
|
|
|
|
4
|
|
|
from ... import _class_placeholder |
|
5
|
|
|
from .. import destructure |
|
6
|
|
|
|
|
7
|
|
|
|
|
8
|
|
|
def _check_structure(structure): |
|
9
|
|
|
destructure.names(structure) # Raise ValueError if there are duplicates |
|
10
|
|
|
|
|
11
|
|
|
|
|
12
|
|
|
def decorate(matchers, structure): |
|
13
|
|
|
if not _class_placeholder.is_placeholder(structure): |
|
14
|
|
|
_check_structure(structure) |
|
15
|
|
|
|
|
16
|
|
|
def decorator(func): |
|
17
|
|
|
matchers.append((structure, func)) |
|
18
|
|
|
return func |
|
19
|
|
|
|
|
20
|
|
|
return decorator |
|
21
|
|
|
|
|
22
|
|
|
|
|
23
|
|
|
class Descriptor: |
|
24
|
|
|
"""Base class for decorator classes.""" |
|
25
|
|
|
|
|
26
|
|
|
__wrapped__ = None |
|
27
|
|
|
|
|
28
|
|
|
def __new__(cls, func, *args, **kwargs): |
|
29
|
|
|
new = super().__new__(cls, *args, **kwargs) |
|
30
|
|
|
new.__doc__ = None |
|
31
|
|
|
if func is None: |
|
32
|
|
|
return new |
|
33
|
|
|
return functools.wraps(func)(new) |
|
34
|
|
|
|
|
35
|
|
|
def _matchers(self) -> typing.Iterator[typing.List[typing.Tuple[typing.Any, typing.Callable]]]: |
|
36
|
|
|
raise NotImplementedError |
|
37
|
|
|
|
|
38
|
|
|
def for_class(self, cls: type) -> None: |
|
39
|
|
|
for matchers in self._matchers(): |
|
40
|
|
|
for index, (structure_, func) in enumerate(matchers[:]): |
|
41
|
|
|
if _class_placeholder.is_placeholder(structure_): |
|
42
|
|
|
structure = structure_(cls) |
|
43
|
|
|
matchers[index] = (structure, func) |
|
44
|
|
|
|
|
45
|
|
|
|
|
46
|
|
|
def for_class(cls: type) -> None: |
|
47
|
|
|
for attr in vars(cls).values(): |
|
48
|
|
|
if isinstance(attr, Descriptor): |
|
49
|
|
|
attr.for_class(cls) |
|
50
|
|
|
|
mwchase /
python-structured-data
