/usr/lib/python3/dist-packages/doublex/proxy.py is in python3-doublex 1.8.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# doublex
#
# Copyright © 2012,2013 David Villa Alises
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import inspect
try:
from inspect import getcallargs
except ImportError:
from .py27_backports import getcallargs
from .internal import ANY_ARG
def create_proxy(collaborator):
if collaborator is None:
return DummyProxy()
return CollaboratorProxy(collaborator)
class Proxy(object):
def assure_signature_matches(self, invocation):
pass
def collaborator_classname(self):
return None
def get_signature(self, method_name):
if self.is_property(method_name):
return PropertySignature(self, method_name)
if not self.is_method_or_func(method_name):
return BuiltinSignature(self, method_name)
return MethodSignature(self, method_name)
def is_property(self, attr_name):
attr = getattr(self.collaborator_class, attr_name)
return isinstance(attr, property)
def is_method_or_func(self, method_name):
func = getattr(self.collaborator, method_name)
if inspect.ismethod(func):
func = func.__func__
return inspect.isfunction(func)
class DummyProxy(Proxy):
def get_attr_typename(self, key):
return 'instancemethod'
def same_method(self, name1, name2):
return name1 == name2
def get_signature(self, method_name):
return DummySignature()
def get_class(something):
if inspect.isclass(something):
return something
else:
return something.__class__
class CollaboratorProxy(Proxy):
'''Represent the collaborator object'''
def __init__(self, collaborator):
self.collaborator = collaborator
self.collaborator_class = get_class(collaborator)
def isclass(self):
return inspect.isclass(self.collaborator)
def get_class_attr(self, key):
return getattr(self.collaborator_class, key)
def get_attr(self, key):
return getattr(self.collaborator, key)
def collaborator_classname(self):
return self.collaborator_class.__name__
def assure_signature_matches(self, invocation):
signature = self.get_signature(invocation.name)
signature.assure_matches(invocation.context)
def get_attr_typename(self, key):
def raise_no_attribute():
reason = "'%s' object has no attribute '%s'" % \
(self.collaborator_classname(), key)
raise AttributeError(reason)
try:
attr = getattr(self.collaborator_class, key)
return type(attr).__name__
except AttributeError:
if self.collaborator is self.collaborator_class:
raise_no_attribute()
try:
attr = getattr(self.collaborator, key)
return type(attr).__name__
except AttributeError:
raise_no_attribute()
def same_method(self, name1, name2):
return getattr(self.collaborator, name1) == \
getattr(self.collaborator, name2)
def perform_invocation(self, invocation):
method = getattr(self.collaborator, invocation.name)
return invocation.context.apply_on(method)
class Signature(object):
def __init__(self, proxy, name):
self.proxy = proxy
self.name = name
self.method = getattr(proxy.collaborator, name)
def get_arg_spec(self):
pass
def get_call_args(self, context):
retval = context.kargs.copy()
for n, i in enumerate(context.args):
retval['_positional_%s' % n] = i
return retval
def __eq__(self, other):
return (self.proxy, self.name, self.method) == \
(other.proxy, other.name, other.method)
class DummySignature(Signature):
def __init__(self):
pass
class BuiltinSignature(Signature):
"builtin collaborator method signature"
def assure_matches(self, context):
doc = self.method.__doc__
if not ')' in doc:
return
rpar = doc.find(')')
params = doc[:rpar]
nkargs = params.count('=')
nargs = params.count(',') + 1 - nkargs
if len(context.args) != nargs:
raise TypeError('%s.%s() takes exactly %s argument (%s given)' % (
self.proxy.collaborator_classname(), self.name,
nargs, len(context.args)))
class MethodSignature(Signature):
"colaborator method signature"
def __init__(self, proxy, name):
super(MethodSignature, self).__init__(proxy, name)
self.argspec = inspect.getargspec(self.method)
def get_arg_spec(self):
retval = inspect.getargspec(self.method)
del retval.args[0]
return retval
def get_call_args(self, context):
args = context.args
if self.proxy.isclass():
args = (None,) + args # self
retval = getcallargs(self.method, *args, **context.kargs)
del retval['self']
return retval
def assure_matches(self, context):
if ANY_ARG in context.args:
return
try:
self.get_call_args(context)
except TypeError as e:
raise TypeError("%s.%s" % (self.proxy.collaborator_classname(), e))
def __repr__(self):
return "%s.%s%s" % (self.proxy.collaborator_classname(),
self.name,
inspect.formatargspec(*self.argspec))
class PropertySignature(Signature):
def __init__(self, proxy, name):
pass
def assure_matches(self, context):
pass
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