Restore 0.1.5 version from stash

wolai-backend/.venv312/Lib/site-packages/pgvector/utils/bit.py

@@ -0,0 +1,61 @@
+import numpy as np
+from struct import pack, unpack_from
+
+
+class Bit:
+    def __init__(self, value):
+        if isinstance(value, str):
+            self._value = self.from_text(value)._value
+        else:
+            # TODO change in 0.4.0
+            # TODO raise if dtype not bool or uint8
+            # if isinstance(value, np.ndarray) and value.dtype == np.uint8:
+            #     value = np.unpackbits(value)
+            # else:
+            #     value = np.asarray(value, dtype=bool)
+
+            value = np.asarray(value, dtype=bool)
+
+            if value.ndim != 1:
+                raise ValueError('expected ndim to be 1')
+
+            self._value = value
+
+    def __repr__(self):
+        return f'Bit({self.to_text()})'
+
+    def to_list(self):
+        return self._value.tolist()
+
+    def to_numpy(self):
+        return self._value
+
+    def to_text(self):
+        return ''.join(self._value.astype(np.uint8).astype(str))
+
+    def to_binary(self):
+        return pack('>i', len(self._value)) + np.packbits(self._value).tobytes()
+
+    @classmethod
+    def from_text(cls, value):
+        return cls(np.asarray([v != '0' for v in value], dtype=bool))
+
+    @classmethod
+    def from_binary(cls, value):
+        count = unpack_from('>i', value)[0]
+        buf = np.frombuffer(value, dtype=np.uint8, offset=4)
+        return cls(np.unpackbits(buf, count=count).astype(bool))
+
+    @classmethod
+    def _to_db(cls, value):
+        if not isinstance(value, cls):
+            raise ValueError('expected bit')
+
+        return value.to_text()
+
+    @classmethod
+    def _to_db_binary(cls, value):
+        if not isinstance(value, cls):
+            raise ValueError('expected bit')
+
+        return value.to_binary()