79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
# 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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"""Various context related utilities, including inference and call contexts."""
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import contextlib
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import pprint
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class InferenceContext(object):
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__slots__ = ('path', 'lookupname', 'callcontext', 'boundnode', 'inferred')
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def __init__(self, path=None, inferred=None):
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self.path = path or set()
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self.lookupname = None
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self.callcontext = None
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self.boundnode = None
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self.inferred = inferred or {}
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def push(self, node):
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name = self.lookupname
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if (node, name) in self.path:
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return True
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self.path.add((node, name))
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return False
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def clone(self):
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# XXX copy lookupname/callcontext ?
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clone = InferenceContext(self.path, inferred=self.inferred)
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clone.callcontext = self.callcontext
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clone.boundnode = self.boundnode
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return clone
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def cache_generator(self, key, generator):
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results = []
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for result in generator:
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results.append(result)
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yield result
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self.inferred[key] = tuple(results)
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return
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@contextlib.contextmanager
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def restore_path(self):
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path = set(self.path)
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yield
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self.path = path
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def __str__(self):
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state = ('%s=%s' % (field, pprint.pformat(getattr(self, field),
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width=80 - len(field)))
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for field in self.__slots__)
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return '%s(%s)' % (type(self).__name__, ',\n '.join(state))
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class CallContext(object):
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"""Holds information for a call site."""
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__slots__ = ('args', 'keywords')
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def __init__(self, args, keywords=None):
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self.args = args
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if keywords:
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keywords = [(arg.arg, arg.value) for arg in keywords]
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else:
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keywords = []
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self.keywords = keywords
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def copy_context(context):
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if context is not None:
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return context.clone()
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return InferenceContext()
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