[3.10] bpo-47004: Sync with importlib_metadata 4.11.3. (GH-31854). (GH-31857)

(cherry picked from commit b1e286860742e7ba6fadc75e3ddb6c2899a56919)

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

4 files changed, 44 insertions, 3 deletions

diff --git a/Doc/library/importlib.metadata.rst b/Doc/library/importlib.metadata.rst
index 50fc904..a6caa99 100644
--- a/Doc/library/importlib.metadata.rst
+++ b/Doc/library/importlib.metadata.rst
@@ -264,6 +264,7 @@ Python packages or modules::
 
 .. versionadded:: 3.10
 
+.. _distributions:
 
 Distributions
 =============
diff --git a/Lib/importlib/metadata/__init__.py b/Lib/importlib/metadata/__init__.py
index c7462f3..b3063cd 100644
--- a/Lib/importlib/metadata/__init__.py
+++ b/Lib/importlib/metadata/__init__.py
@@ -128,6 +128,15 @@ class EntryPoint(
     See `the packaging docs on entry points
     <https://packaging.python.org/specifications/entry-points/>`_
     for more information.
+
+    >>> ep = EntryPoint(
+    ...     name=None, group=None, value='package.module:attr [extra1, extra2]')
+    >>> ep.module
+    'package.module'
+    >>> ep.attr
+    'attr'
+    >>> ep.extras
+    ['extra1', 'extra2']
     """
 
     pattern = re.compile(
@@ -176,7 +185,7 @@ class EntryPoint(
     @property
     def extras(self):
         match = self.pattern.match(self.value)
-        return list(re.finditer(r'\w+', match.group('extras') or ''))
+        return re.findall(r'\w+', match.group('extras') or '')
 
     def _for(self, dist):
         self.dist = dist
@@ -200,6 +209,25 @@ class EntryPoint(
         )
 
     def matches(self, **params):
+        """
+        EntryPoint matches the given parameters.
+
+        >>> ep = EntryPoint(group='foo', name='bar', value='bing:bong [extra1, extra2]')
+        >>> ep.matches(group='foo')
+        True
+        >>> ep.matches(name='bar', value='bing:bong [extra1, extra2]')
+        True
+        >>> ep.matches(group='foo', name='other')
+        False
+        >>> ep.matches()
+        True
+        >>> ep.matches(extras=['extra1', 'extra2'])
+        True
+        >>> ep.matches(module='bing')
+        True
+        >>> ep.matches(attr='bong')
+        True
+        """
         attrs = (getattr(self, param) for param in params)
         return all(map(operator.eq, params.values(), attrs))
 
@@ -650,7 +678,7 @@ class Distribution:
 
     def _read_egg_info_reqs(self):
         source = self.read_text('requires.txt')
-        return source and self._deps_from_requires_text(source)
+        return None if source is None else self._deps_from_requires_text(source)
 
     @classmethod
     def _deps_from_requires_text(cls, source):
@@ -752,7 +780,6 @@ class FastPath:
 
     def __init__(self, root):
         self.root = root
-        self.base = os.path.basename(self.root).lower()
 
     def joinpath(self, child):
         return pathlib.Path(self.root, child)
diff --git a/Lib/test/test_importlib/test_metadata_api.py b/Lib/test/test_importlib/test_metadata_api.py
index 0890d6c..799f007 100644
--- a/Lib/test/test_importlib/test_metadata_api.py
+++ b/Lib/test/test_importlib/test_metadata_api.py
@@ -222,6 +222,16 @@ class APITests(
         assert len(deps) == 2
         assert any(dep == 'wheel >= 1.0; python_version >= "2.7"' for dep in deps)
 
+    def test_requires_egg_info_empty(self):
+        fixtures.build_files(
+            {
+                'requires.txt': '',
+            },
+            self.site_dir.joinpath('egginfo_pkg.egg-info'),
+        )
+        deps = requires('egginfo-pkg')
+        assert deps == []
+
     def test_requires_dist_info(self):
         deps = requires('distinfo-pkg')
         assert len(deps) == 2
diff --git a/Misc/NEWS.d/next/Library/2022-03-13-15-04-05.bpo-47004.SyYpxd.rst b/Misc/NEWS.d/next/Library/2022-03-13-15-04-05.bpo-47004.SyYpxd.rst
new file mode 100644
index 0000000..3cb3b21
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-03-13-15-04-05.bpo-47004.SyYpxd.rst
@@ -0,0 +1,3 @@
+Apply bugfixes from importlib_metadata 4.11.3, including bugfix for
+EntryPoint.extras, which was returning match objects and not the extras
+strings.