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# copyright 2003-2015 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of astroid.
#
# astroid is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 2.1 of the License, or (at your
# option) any later version.
#
# astroid 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 Lesser General Public License
# for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with astroid. If not, see <http://www.gnu.org/licenses/>.
#
# The code in this file was originally part of logilab-common, licensed under
# the same license.
import sys
import warnings
import lazy_object_proxy
import six
def reraise(exception):
'''Reraises an exception with the traceback from the current exception
block.'''
six.reraise(type(exception), exception, sys.exc_info()[2])
@object.__new__
class Uninferable(object):
"""Special inference object, which is returned when inference fails."""
def __repr__(self):
return 'Uninferable'
def __getattribute__(self, name):
if name == 'next':
raise AttributeError('next method should not be called')
if name.startswith('__') and name.endswith('__'):
return object.__getattribute__(self, name)
return self
def __call__(self, *args, **kwargs):
return self
class BadOperationMessage(object):
"""Object which describes a TypeError occurred somewhere in the inference chain
This is not an exception, but a container object which holds the types and
the error which occurred.
"""
class BadUnaryOperationMessage(BadOperationMessage):
"""Object which describes operational failures on UnaryOps."""
def __init__(self, operand, op, error):
self.operand = operand
self.op = op
self.error = error
def __str__(self):
operand_type = self.operand.name
msg = "bad operand type for unary {}: {}"
return msg.format(self.op, operand_type)
class BadBinaryOperationMessage(BadOperationMessage):
"""Object which describes type errors for BinOps."""
def __init__(self, left_type, op, right_type):
self.left_type = left_type
self.right_type = right_type
self.op = op
def __str__(self):
msg = "unsupported operand type(s) for {}: {!r} and {!r}"
return msg.format(self.op, self.left_type.name, self.right_type.name)
def _instancecheck(cls, other):
wrapped = cls.__wrapped__
other_cls = other.__class__
is_instance_of = wrapped is other_cls or issubclass(other_cls, wrapped)
warnings.warn("%r is deprecated and slated for removal in astroid "
"2.0, use %r instead" % (cls.__class__.__name__,
wrapped.__name__),
PendingDeprecationWarning, stacklevel=2)
return is_instance_of
def proxy_alias(alias_name, node_type):
"""Get a Proxy from the given name to the given node type."""
proxy = type(alias_name, (lazy_object_proxy.Proxy,),
{'__class__': object.__dict__['__class__'],
'__instancecheck__': _instancecheck})
return proxy(lambda: node_type)
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