Re-implement glob directly, adding compatibility for older Pythons an…

…d avoids platform-specific concerns.

zipp/__init__.py

@@ -4,6 +4,8 @@
 import itertools
 import contextlib
 import pathlib
+import re
+import fnmatch
 
 from .py310compat import text_encoding
 
@@ -327,36 +329,25 @@ def match(self, path_pattern):
     def is_symlink(self):
         return False  # See #82102
 
-    @contextlib.contextmanager
-    def _scandir(self):  # Needed for glob
-        yield self.iterdir()
-
-    def _make_child_relpath(self, relpath):  # Needed for glob
-        return self / relpath
+    def _descendants(self):
+        for child in self.iterdir():
+            yield child
+            if child.is_dir():
+                yield from child._descendants()
 
     def glob(self, pattern):
         if not pattern:
             raise ValueError("Unacceptable pattern: {!r}".format(pattern))
-        path = pathlib.Path(self.at)
-        drv, root, pattern_parts = path._flavour.parse_parts((pattern,))
-        if drv or root:
-            raise NotImplementedError("Non-relative patterns are unsupported")
-        if pattern[-1] in (path._flavour.sep, path._flavour.altsep):
-            pattern_parts.append('')
-        selector = pathlib._make_selector(tuple(pattern_parts), path._flavour)
-        for p in selector.select_from(self):
-            yield p
+
+        matches = re.compile(fnmatch.translate(pattern)).fullmatch
+        return (
+            child
+            for child in self._descendants()
+            if matches(str(child.relative_to(self)))
+        )
 
     def rglob(self, pattern):
-        path = pathlib.Path(self.at)
-        drv, root, pattern_parts = path._flavour.parse_parts((pattern,))
-        if drv or root:
-            raise NotImplementedError("Non-relative patterns are unsupported")
-        if pattern and pattern[-1] in (path._flavour.sep, path._flavour.altsep):
-            pattern_parts.append('')
-        selector = pathlib._make_selector(("**",) + tuple(pattern_parts), path._flavour)
-        for p in selector.select_from(self):
-            yield p
+        return self.glob(f'**/{pattern}')
 
     def relative_to(self, *other, **kwargs):
         other = (pathlib.Path(each.at) for each in other)