Close #2820: autoclass directive supports nested class

CHANGES

@@ -162,6 +162,7 @@ Features added
   if :confval:`latex_engine` is ``'xelatex'`` or ``'lualatex'``.
 * #4976: ``SphinxLoggerAdapter.info()`` now supports ``location`` parameter
 * #5122: setuptools: support nitpicky option
+* #2820: autoclass directive supports nested class
 
 Bugs fixed
 ----------

sphinx/ext/autodoc/importer.py

@@ -167,8 +167,21 @@ def import_object(modname, objpath, objtype='', attrgetter=safe_getattr, warning
         logger.debug('[autodoc] import %s', modname)
 
     try:
-        module = import_module(modname, warningiserror=warningiserror)
+        module = None
-        logger.debug('[autodoc] => %r', module)
+        objpath = list(objpath)
+        while module is None:
+            try:
+                module = import_module(modname, warningiserror=warningiserror)
+                logger.debug('[autodoc] import %s => %r', modname, module)
+            except ImportError:
+                logger.debug('[autodoc] import %s => failed', modname)
+                if '.' in modname:
+                    # retry with parent module
+                    modname, name = modname.rsplit('.', 1)
+                    objpath.insert(0, name)
+                else:
+                    raise
+
         obj = module
         parent = None
         object_name = None

tests/test_autodoc.py

@@ -771,6 +771,9 @@ def test_generate():
                       ('class', 'target.Outer.Inner'),
                       ('method', 'target.Outer.Inner.meth')],
                      'class', 'Outer', all_members=True)
+    assert_processes([('class', 'target.Outer.Inner'),
+                      ('method', 'target.Outer.Inner.meth')],
+                     'class', 'target.Outer.Inner', all_members=True)
 
     # test descriptor docstrings
     assert_result_contains('   Descriptor instance docstring.',