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# copyright 2003-2013 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/>.
"""this module contains exceptions used in the astroid library
"""
from astroid import util
class AstroidError(Exception):
"""base exception class for all astroid related exceptions
AstroidError and its subclasses are structured, intended to hold
objects representing state when the exception is thrown. Field
values are passed to the constructor as keyword-only arguments.
Each subclass has its own set of standard fields, but use your
best judgment to decide whether a specific exception instance
needs more or fewer fields for debugging. Field values may be
used to lazily generate the error message: self.message.format()
will be called with the field names and values supplied as keyword
arguments.
"""
def __init__(self, message='', **kws):
self.message = message
for key, value in kws.items():
setattr(self, key, value)
def __str__(self):
return self.message.format(**vars(self))
class AstroidBuildingException(AstroidError):
"""exception class when we are unable to build an astroid representation
Standard attributes:
modname: Name of the module that AST construction failed for.
error: Exception raised during construction.
"""
def __init__(self, message='Failed to import module {modname}.', **kws):
super(AstroidBuildingException, self).__init__(message, **kws)
class NoDefault(AstroidError):
"""raised by function's `default_value` method when an argument has
no default value
Standard attributes:
func: Function node.
name: Name of argument without a default.
"""
func = None
name = None
def __init__(self, message='{func!r} has no default for {name!r}.', **kws):
super(NoDefault, self).__init__(message, **kws)
class DefaultStop(AstroidError):
'''This is a special error that's only meant to be raised in
generators wrapped with raise_if_nothing_inferred and
yes_if_nothing_inferred. It does nothing other than carry a set
of attributes to be used in raising in InferenceError.
'''
# def __init__(self, message='{func!r} has no default for {name!r}.', **kws):
# super(NoDefault, self).__init__(message, **kws)
class ResolveError(AstroidError):
"""Base class of astroid resolution/inference error.
ResolveError is not intended to be raised.
Standard attributes:
context: InferenceContext object.
"""
context = None
class MroError(ResolveError):
"""Error raised when there is a problem with method resolution of a class.
Standard attributes:
mros: A sequence of sequences containing ClassDef nodes.
cls: ClassDef node whose MRO resolution failed.
context: InferenceContext object.
"""
mros = ()
cls = None
def __str__(self):
mro_names = ", ".join("({})".format(", ".join(b.name for b in m))
for m in self.mros)
return self.message.format(mros=mro_names, cls=self.cls)
class DuplicateBasesError(MroError):
"""Error raised when there are duplicate bases in the same class bases."""
class InconsistentMroError(MroError):
"""Error raised when a class's MRO is inconsistent."""
class SuperError(ResolveError):
"""Error raised when there is a problem with a super call.
Standard attributes:
super_: The Super instance that raised the exception.
context: InferenceContext object.
"""
super_ = None
def __str__(self):
return self.message.format(**vars(self.super_))
class InferenceError(ResolveError):
"""raised when we are unable to infer a node
Standard attributes:
node: The node inference was called on.
context: InferenceContext object.
"""
node = None
context= None
def __init__(self, message='Inference failed for {node!r}.', **kws):
super(InferenceError, self).__init__(message, **kws)
# Why does this inherit from InferenceError rather than ResolveError?
# Changing it causes some inference tests to fail.
class NameInferenceError(InferenceError):
"""Raised when a name lookup fails, corresponds to NameError.
Standard attributes:
name: The name for which lookup failed, as a string.
scope: The node representing the scope in which the lookup occurred.
context: InferenceContext object.
"""
name = None
scope = None
def __init__(self, message='{name!r} not found in {scope!r}.', **kws):
super(NameInferenceError, self).__init__(message, **kws)
class AttributeInferenceError(ResolveError):
"""Raised when an attribute lookup fails, corresponds to AttributeError.
Standard attributes:
target: The node for which lookup failed.
attribute: The attribute for which lookup failed, as a string.
context: InferenceContext object.
"""
target = None
attribute = None
def __init__(self, message='{attribute!r} not found on {target!r}.', **kws):
super(AttributeInferenceError, self).__init__(message, **kws)
class UseInferenceDefault(Exception):
"""exception to be raised in custom inference function to indicate that it
should go back to the default behaviour
"""
# Backwards-compatibility aliases
OperationError = util.BadOperationMessage
UnaryOperationError = util.BadUnaryOperationMessage
BinaryOperationError = util.BadBinaryOperationMessage
SuperArgumentTypeError = SuperError
UnresolvableName = NameInferenceError
NotFoundError = AttributeInferenceError
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