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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/>.
"""Various context related utilities, including inference and call contexts."""
import contextlib
class InferenceContext(object):
__slots__ = ('path', 'lookupname', 'callcontext', 'boundnode', 'inferred')
def __init__(self, path=None, inferred=None):
self.path = path or set()
self.lookupname = None
self.callcontext = None
self.boundnode = None
self.inferred = inferred or {}
def push(self, node):
name = self.lookupname
if (node, name) in self.path:
raise StopIteration()
self.path.add((node, name))
def clone(self):
# XXX copy lookupname/callcontext ?
clone = InferenceContext(self.path, inferred=self.inferred)
clone.callcontext = self.callcontext
clone.boundnode = self.boundnode
return clone
def cache_generator(self, key, generator):
results = []
for result in generator:
results.append(result)
yield result
self.inferred[key] = tuple(results)
return
@contextlib.contextmanager
def restore_path(self):
path = set(self.path)
yield
self.path = path
class CallContext(object):
"""Holds information for a call site."""
__slots__ = ('args', 'keywords')
def __init__(self, args, keywords=None):
self.args = args
if keywords:
keywords = [(arg.arg, arg.value) for arg in keywords]
else:
keywords = []
self.keywords = keywords
def copy_context(context):
if context is not None:
return context.clone()
else:
return InferenceContext()