134 lines
3.0 KiB
Python
134 lines
3.0 KiB
Python
import itertools
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import abc
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try:
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from collections.abc import Mapping, Sequence
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except ImportError:
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from collections import Mapping, Sequence
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from copy import deepcopy
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from . import utils
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from . import pycompat
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def needs_parentheses(source):
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def code(s):
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return compile(s, '<variable>', 'eval').co_code
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return code('{}.x'.format(source)) != code('({}).x'.format(source))
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class BaseVariable(pycompat.ABC):
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def __init__(self, source, exclude=()):
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self.source = source
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self.exclude = utils.ensure_tuple(exclude)
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self.code = compile(source, '<variable>', 'eval')
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if needs_parentheses(source):
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self.unambiguous_source = '({})'.format(source)
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else:
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self.unambiguous_source = source
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def items(self, frame, normalize=False):
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try:
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main_value = eval(self.code, frame.f_globals or {}, frame.f_locals)
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except Exception:
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return ()
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return self._items(main_value, normalize)
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@abc.abstractmethod
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def _items(self, key, normalize=False):
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raise NotImplementedError
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@property
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def _fingerprint(self):
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return (type(self), self.source, self.exclude)
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def __hash__(self):
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return hash(self._fingerprint)
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def __eq__(self, other):
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return (isinstance(other, BaseVariable) and
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self._fingerprint == other._fingerprint)
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class CommonVariable(BaseVariable):
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def _items(self, main_value, normalize=False):
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result = [(self.source, utils.get_shortish_repr(main_value, normalize=normalize))]
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for key in self._safe_keys(main_value):
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try:
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if key in self.exclude:
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continue
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value = self._get_value(main_value, key)
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except Exception:
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continue
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result.append((
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'{}{}'.format(self.unambiguous_source, self._format_key(key)),
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utils.get_shortish_repr(value)
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))
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return result
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def _safe_keys(self, main_value):
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try:
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for key in self._keys(main_value):
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yield key
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except Exception:
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pass
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def _keys(self, main_value):
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return ()
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def _format_key(self, key):
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raise NotImplementedError
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def _get_value(self, main_value, key):
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raise NotImplementedError
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class Attrs(CommonVariable):
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def _keys(self, main_value):
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return itertools.chain(
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getattr(main_value, '__dict__', ()),
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getattr(main_value, '__slots__', ())
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)
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def _format_key(self, key):
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return '.' + key
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def _get_value(self, main_value, key):
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return getattr(main_value, key)
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class Keys(CommonVariable):
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def _keys(self, main_value):
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return main_value.keys()
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def _format_key(self, key):
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return '[{}]'.format(utils.get_shortish_repr(key))
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def _get_value(self, main_value, key):
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return main_value[key]
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class Indices(Keys):
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_slice = slice(None)
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def _keys(self, main_value):
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return range(len(main_value))[self._slice]
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def __getitem__(self, item):
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assert isinstance(item, slice)
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result = deepcopy(self)
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result._slice = item
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return result
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class Exploding(BaseVariable):
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def _items(self, main_value, normalize=False):
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if isinstance(main_value, Mapping):
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cls = Keys
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elif isinstance(main_value, Sequence):
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cls = Indices
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else:
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cls = Attrs
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return cls(self.source, self.exclude)._items(main_value, normalize)
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