Initial commit

venv/Lib/site-packages/frozenlist/__init__.py

@@ -0,0 +1,98 @@
+import os
+import sys
+import types
+from collections.abc import MutableSequence
+from functools import total_ordering
+from typing import Any, Type
+
+__version__ = "1.5.0"
+
+__all__ = ("FrozenList", "PyFrozenList")  # type: Tuple[str, ...]
+
+
+NO_EXTENSIONS = bool(os.environ.get("FROZENLIST_NO_EXTENSIONS"))  # type: bool
+
+
+@total_ordering
+class FrozenList(MutableSequence):
+    __slots__ = ("_frozen", "_items")
+
+    if sys.version_info >= (3, 9):
+        __class_getitem__ = classmethod(types.GenericAlias)
+    else:
+
+        @classmethod
+        def __class_getitem__(
+            cls: Type["FrozenList"],
+            cls_item: Any,
+        ) -> Type["FrozenList"]:
+            return cls
+
+    def __init__(self, items=None):
+        self._frozen = False
+        if items is not None:
+            items = list(items)
+        else:
+            items = []
+        self._items = items
+
+    @property
+    def frozen(self):
+        return self._frozen
+
+    def freeze(self):
+        self._frozen = True
+
+    def __getitem__(self, index):
+        return self._items[index]
+
+    def __setitem__(self, index, value):
+        if self._frozen:
+            raise RuntimeError("Cannot modify frozen list.")
+        self._items[index] = value
+
+    def __delitem__(self, index):
+        if self._frozen:
+            raise RuntimeError("Cannot modify frozen list.")
+        del self._items[index]
+
+    def __len__(self):
+        return self._items.__len__()
+
+    def __iter__(self):
+        return self._items.__iter__()
+
+    def __reversed__(self):
+        return self._items.__reversed__()
+
+    def __eq__(self, other):
+        return list(self) == other
+
+    def __le__(self, other):
+        return list(self) <= other
+
+    def insert(self, pos, item):
+        if self._frozen:
+            raise RuntimeError("Cannot modify frozen list.")
+        self._items.insert(pos, item)
+
+    def __repr__(self):
+        return f"<FrozenList(frozen={self._frozen}, {self._items!r})>"
+
+    def __hash__(self):
+        if self._frozen:
+            return hash(tuple(self))
+        else:
+            raise RuntimeError("Cannot hash unfrozen list.")
+
+
+PyFrozenList = FrozenList
+
+
+if not NO_EXTENSIONS:
+    try:
+        from ._frozenlist import FrozenList as CFrozenList  # type: ignore
+    except ImportError:  # pragma: no cover
+        pass
+    else:
+        FrozenList = CFrozenList  # type: ignore