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
|
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import abc
import inspect
import sys
DeprecatedIn06 = DeprecationWarning
def register_interface(iface):
def register_decorator(klass):
verify_interface(iface, klass)
iface.register(klass)
return klass
return register_decorator
def read_only_property(name):
return property(lambda self: getattr(self, name))
class InterfaceNotImplemented(Exception):
pass
def verify_interface(iface, klass):
for method in iface.__abstractmethods__:
if not hasattr(klass, method):
raise InterfaceNotImplemented(
"{0} is missing a {1!r} method".format(klass, method)
)
if isinstance(getattr(iface, method), abc.abstractproperty):
# Can't properly verify these yet.
continue
spec = inspect.getargspec(getattr(iface, method))
actual = inspect.getargspec(getattr(klass, method))
if spec != actual:
raise InterfaceNotImplemented(
"{0}.{1}'s signature differs from the expected. Expected: "
"{2!r}. Received: {3!r}".format(
klass, method, spec, actual
)
)
if sys.version_info >= (2, 7):
def bit_length(x):
return x.bit_length()
else:
def bit_length(x):
return len(bin(x)) - (2 + (x <= 0))
|
