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
|
import numpy as np
from struct import pack, unpack_from
class Bit:
def __init__(self, value):
if isinstance(value, str):
self._value = self.from_text(value)._value
else:
# TODO change in 0.4.0
# TODO raise if dtype not bool or uint8
# if isinstance(value, np.ndarray) and value.dtype == np.uint8:
# value = np.unpackbits(value)
# else:
# value = np.asarray(value, dtype=bool)
value = np.asarray(value, dtype=bool)
if value.ndim != 1:
raise ValueError('expected ndim to be 1')
self._value = value
def __repr__(self):
return f'Bit({self.to_text()})'
def to_list(self):
return self._value.tolist()
def to_numpy(self):
return self._value
def to_text(self):
return ''.join(self._value.astype(np.uint8).astype(str))
def to_binary(self):
return pack('>i', len(self._value)) + np.packbits(self._value).tobytes()
@classmethod
def from_text(cls, value):
return cls(np.asarray([v != '0' for v in value], dtype=bool))
@classmethod
def from_binary(cls, value):
count = unpack_from('>i', value)[0]
buf = np.frombuffer(value, dtype=np.uint8, offset=4)
return cls(np.unpackbits(buf, count=count).astype(bool))
@classmethod
def _to_db(cls, value):
if not isinstance(value, cls):
raise ValueError('expected bit')
return value.to_text()
@classmethod
def _to_db_binary(cls, value):
if not isinstance(value, cls):
raise ValueError('expected bit')
return value.to_binary()
|
