2026-1-6

venv/Lib/site-packages/whoosh/legacy.py

@@ -0,0 +1,77 @@
+# Copyright 2012 Matt Chaput. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#    1. Redistributions of source code must retain the above copyright notice,
+#       this list of conditions and the following disclaimer.
+#
+#    2. Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY MATT CHAPUT ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+# EVENT SHALL MATT CHAPUT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+# OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# The views and conclusions contained in the software and documentation are
+# those of the authors and should not be interpreted as representing official
+# policies, either expressed or implied, of Matt Chaput.
+
+"""
+This module contains code for maintaining backwards compatibility with old
+index formats.
+"""
+
+from whoosh.util.loading import RenamingUnpickler
+
+
+def load_110_toc(stream, gen, schema, version):
+    # Between version -110 and version -111, I reorganized the modules and
+    # changed the implementation of the NUMERIC field, so we have to change the
+    # classes the unpickler tries to load if we need to read an old schema
+
+    # Read the length of the pickled schema
+    picklen = stream.read_varint()
+    if schema:
+        # If the user passed us a schema, use it and skip the one on disk
+        stream.seek(picklen, 1)
+    else:
+        # Remap the old classes and functions to their moved versions as we
+        # unpickle the schema
+        scuts = {"wf": "whoosh.fields",
+                 "wsn": "whoosh.support.numeric",
+                 "wcw2": "whoosh.codec.whoosh2"}
+        objmap = {"%(wf)s.NUMERIC": "%(wcw2)s.OLD_NUMERIC",
+                  "%(wf)s.DATETIME": "%(wcw2)s.OLD_DATETIME",
+                  "%(wsn)s.int_to_text": "%(wcw2)s.int_to_text",
+                  "%(wsn)s.text_to_int": "%(wcw2)s.text_to_int",
+                  "%(wsn)s.long_to_text": "%(wcw2)s.long_to_text",
+                  "%(wsn)s.text_to_long": "%(wcw2)s.text_to_long",
+                  "%(wsn)s.float_to_text": "%(wcw2)s.float_to_text",
+                  "%(wsn)s.text_to_float": "%(wcw2)s.text_to_float", }
+        ru = RenamingUnpickler(stream, objmap, shortcuts=scuts)
+        schema = ru.load()
+    # Read the generation number
+    index_gen = stream.read_int()
+    assert gen == index_gen
+    # Unused number
+    _ = stream.read_int()
+    # Unpickle the list of segment objects
+    segments = stream.read_pickle()
+    return schema, segments
+
+
+# Map TOC version numbers to functions to load that version
+toc_loaders = {-110: load_110_toc}
+
+
+# Map segment class names to functions to load the segment
+segment_loaders = {}