117 lines
3.5 KiB
Python
117 lines
3.5 KiB
Python
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# Copyright (c) 2015-2016 Cara Vinson <ceridwenv@gmail.com>
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# Copyright (c) 2015-2016 Claudiu Popa <pcmanticore@gmail.com>
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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
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# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER
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import sys
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import warnings
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import importlib
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import lazy_object_proxy
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import six
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def lazy_descriptor(obj):
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class DescriptorProxy(lazy_object_proxy.Proxy):
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def __get__(self, instance, owner=None):
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return self.__class__.__get__(self, instance)
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return DescriptorProxy(obj)
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def lazy_import(module_name):
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return lazy_object_proxy.Proxy(
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lambda: importlib.import_module('.' + module_name, 'astroid'))
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def reraise(exception):
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'''Reraises an exception with the traceback from the current exception
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block.'''
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six.reraise(type(exception), exception, sys.exc_info()[2])
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@object.__new__
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class Uninferable(object):
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"""Special inference object, which is returned when inference fails."""
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def __repr__(self):
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return 'Uninferable'
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__str__ = __repr__
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def __getattribute__(self, name):
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if name == 'next':
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raise AttributeError('next method should not be called')
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if name.startswith('__') and name.endswith('__'):
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return object.__getattribute__(self, name)
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if name == 'accept':
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return object.__getattribute__(self, name)
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return self
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def __call__(self, *args, **kwargs):
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return self
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def __bool__(self):
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return False
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__nonzero__ = __bool__
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def accept(self, visitor):
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func = getattr(visitor, "visit_uninferable")
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return func(self)
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class BadOperationMessage(object):
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"""Object which describes a TypeError occurred somewhere in the inference chain
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This is not an exception, but a container object which holds the types and
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the error which occurred.
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"""
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class BadUnaryOperationMessage(BadOperationMessage):
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"""Object which describes operational failures on UnaryOps."""
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def __init__(self, operand, op, error):
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self.operand = operand
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self.op = op
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self.error = error
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def __str__(self):
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operand_type = self.operand.name
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msg = "bad operand type for unary {}: {}"
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return msg.format(self.op, operand_type)
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class BadBinaryOperationMessage(BadOperationMessage):
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"""Object which describes type errors for BinOps."""
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def __init__(self, left_type, op, right_type):
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self.left_type = left_type
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self.right_type = right_type
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self.op = op
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def __str__(self):
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msg = "unsupported operand type(s) for {}: {!r} and {!r}"
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return msg.format(self.op, self.left_type.name, self.right_type.name)
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def _instancecheck(cls, other):
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wrapped = cls.__wrapped__
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other_cls = other.__class__
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is_instance_of = wrapped is other_cls or issubclass(other_cls, wrapped)
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warnings.warn("%r is deprecated and slated for removal in astroid "
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"2.0, use %r instead" % (cls.__class__.__name__,
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wrapped.__name__),
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PendingDeprecationWarning, stacklevel=2)
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return is_instance_of
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def proxy_alias(alias_name, node_type):
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"""Get a Proxy from the given name to the given node type."""
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proxy = type(alias_name, (lazy_object_proxy.Proxy,),
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{'__class__': object.__dict__['__class__'],
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'__instancecheck__': _instancecheck})
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return proxy(lambda: node_type)
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# Backwards-compatibility aliases
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YES = Uninferable
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