import os
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import types
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from collections.abc import MutableSequence
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from functools import total_ordering
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__version__ = "1.8.0"
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__all__ = ("FrozenList", "PyFrozenList") # type: Tuple[str, ...]
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NO_EXTENSIONS = bool(os.environ.get("FROZENLIST_NO_EXTENSIONS")) # type: bool
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@total_ordering
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class FrozenList(MutableSequence):
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__slots__ = ("_frozen", "_items")
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__class_getitem__ = classmethod(types.GenericAlias)
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def __init__(self, items=None):
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self._frozen = False
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if items is not None:
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items = list(items)
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else:
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items = []
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self._items = items
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@property
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def frozen(self):
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return self._frozen
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def freeze(self):
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self._frozen = True
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def __getitem__(self, index):
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return self._items[index]
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def __setitem__(self, index, value):
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if self._frozen:
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raise RuntimeError("Cannot modify frozen list.")
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self._items[index] = value
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def __delitem__(self, index):
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if self._frozen:
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raise RuntimeError("Cannot modify frozen list.")
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del self._items[index]
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def __len__(self):
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return self._items.__len__()
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def __iter__(self):
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return self._items.__iter__()
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def __reversed__(self):
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return self._items.__reversed__()
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def __eq__(self, other):
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return list(self) == other
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def __le__(self, other):
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return list(self) <= other
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def insert(self, pos, item):
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if self._frozen:
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raise RuntimeError("Cannot modify frozen list.")
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self._items.insert(pos, item)
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def __repr__(self):
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return f"<FrozenList(frozen={self._frozen}, {self._items!r})>"
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def __hash__(self):
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if self._frozen:
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return hash(tuple(self))
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else:
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raise RuntimeError("Cannot hash unfrozen list.")
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PyFrozenList = FrozenList
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if not NO_EXTENSIONS:
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try:
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from ._frozenlist import FrozenList as CFrozenList # type: ignore
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except ImportError: # pragma: no cover
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pass
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else:
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FrozenList = CFrozenList # type: ignore
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