127 lines
3.4 KiB
Python
127 lines
3.4 KiB
Python
# 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 binascii
|
|
import inspect
|
|
import struct
|
|
import sys
|
|
import warnings
|
|
|
|
|
|
DeprecatedIn09 = DeprecationWarning
|
|
DeprecatedIn10 = PendingDeprecationWarning
|
|
|
|
|
|
def read_only_property(name):
|
|
return property(lambda self: getattr(self, name))
|
|
|
|
|
|
def register_interface(iface):
|
|
def register_decorator(klass):
|
|
verify_interface(iface, klass)
|
|
iface.register(klass)
|
|
return klass
|
|
return register_decorator
|
|
|
|
|
|
if hasattr(int, "from_bytes"):
|
|
int_from_bytes = int.from_bytes
|
|
else:
|
|
def int_from_bytes(data, byteorder, signed=False):
|
|
assert byteorder == 'big'
|
|
assert not signed
|
|
|
|
if len(data) % 4 != 0:
|
|
data = (b'\x00' * (4 - (len(data) % 4))) + data
|
|
|
|
result = 0
|
|
|
|
while len(data) > 0:
|
|
digit, = struct.unpack('>I', data[:4])
|
|
result = (result << 32) + digit
|
|
data = data[4:]
|
|
|
|
return result
|
|
|
|
|
|
def int_to_bytes(integer, length=None):
|
|
hex_string = '%x' % integer
|
|
if length is None:
|
|
n = len(hex_string)
|
|
else:
|
|
n = length * 2
|
|
return binascii.unhexlify(hex_string.zfill(n + (n & 1)))
|
|
|
|
|
|
class InterfaceNotImplemented(Exception):
|
|
pass
|
|
|
|
|
|
if hasattr(inspect, "signature"):
|
|
signature = inspect.signature
|
|
else:
|
|
signature = inspect.getargspec
|
|
|
|
|
|
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
|
|
sig = signature(getattr(iface, method))
|
|
actual = signature(getattr(klass, method))
|
|
if sig != actual:
|
|
raise InterfaceNotImplemented(
|
|
"{0}.{1}'s signature differs from the expected. Expected: "
|
|
"{2!r}. Received: {3!r}".format(
|
|
klass, method, sig, 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))
|
|
|
|
|
|
class _DeprecatedValue(object):
|
|
def __init__(self, value, message, warning_class):
|
|
self.value = value
|
|
self.message = message
|
|
self.warning_class = warning_class
|
|
|
|
|
|
class _ModuleWithDeprecations(object):
|
|
def __init__(self, module):
|
|
self.__dict__["_module"] = module
|
|
|
|
def __getattr__(self, attr):
|
|
obj = getattr(self._module, attr)
|
|
if isinstance(obj, _DeprecatedValue):
|
|
warnings.warn(obj.message, obj.warning_class, stacklevel=2)
|
|
obj = obj.value
|
|
return obj
|
|
|
|
def __setattr__(self, attr, value):
|
|
setattr(self._module, attr, value)
|
|
|
|
def __dir__(self):
|
|
return ["_module"] + dir(self._module)
|
|
|
|
|
|
def deprecated(value, module_name, message, warning_class):
|
|
module = sys.modules[module_name]
|
|
if not isinstance(module, _ModuleWithDeprecations):
|
|
sys.modules[module_name] = module = _ModuleWithDeprecations(module)
|
|
return _DeprecatedValue(value, message, warning_class)
|