Fix #7551: autosummary: a nested class is indexed as non-nested class

CHANGES

@@ -85,6 +85,7 @@ Bugs fixed
 * #6857: autodoc: failed to detect a classmethod on Enum class
 * #7562: autodoc: a typehint contains spaces is wrongly rendered under
   autodoc_typehints='description' mode
+* #7551: autosummary: a nested class is indexed as non-nested class
 * #7535: sphinx-autogen: crashes when custom template uses inheritance
 * #7536: sphinx-autogen: crashes when template uses i18n feature
 * #2785: html: Bad alignment of equation links

sphinx/ext/autosummary/generate.py

@@ -45,6 +45,7 @@ from sphinx.locale import __
 from sphinx.registry import SphinxComponentRegistry
 from sphinx.util import logging
 from sphinx.util import rst
+from sphinx.util import split_full_qualified_name
 from sphinx.util.inspect import safe_getattr
 from sphinx.util.osutil import ensuredir
 from sphinx.util.template import SphinxTemplateLoader
@@ -248,19 +249,19 @@ def generate_autosummary_content(name: str, obj: Any, parent: Any,
         ns['attributes'], ns['all_attributes'] = \
             get_members(obj, {'attribute', 'property'})
 
-    parts = name.split('.')
+    modname, qualname = split_full_qualified_name(name)
     if doc.objtype in ('method', 'attribute', 'property'):
-        mod_name = '.'.join(parts[:-2])
-        cls_name = parts[-2]
-        obj_name = '.'.join(parts[-2:])
-        ns['class'] = cls_name
+        ns['class'] = qualname.rsplit(".", 1)[0]
+
+    if doc.objtype in ('class',):
+        shortname = qualname
     else:
-        mod_name, obj_name = '.'.join(parts[:-1]), parts[-1]
+        shortname = qualname.rsplit(".", 1)[-1]
 
     ns['fullname'] = name
-    ns['module'] = mod_name
-    ns['objname'] = obj_name
-    ns['name'] = parts[-1]
+    ns['module'] = modname
+    ns['objname'] = qualname
+    ns['name'] = shortname
 
     ns['objtype'] = doc.objtype
     ns['underline'] = len(name) * '='

sphinx/util/__init__.py

@@ -570,6 +570,31 @@ def import_object(objname: str, source: str = None) -> Any:
             raise ExtensionError('Could not import %s' % objname, exc)
 
 
+def split_full_qualified_name(name: str) -> Tuple[str, str]:
+    """Split full qualified name to a pair of modname and qualname.
+
+    A qualname is an abbreviation for "Qualified name" introduced at PEP-3155
+    (https://www.python.org/dev/peps/pep-3155/).  It is a dotted path name
+    from the module top-level.
+
+    A "full" qualified name means a string containing both module name and
+    qualified name.
+
+    .. note:: This function imports module actually to check the exisitence.
+              Therefore you need to mock 3rd party modules if needed before
+              calling this function.
+    """
+    parts = name.split('.')
+    for i, part in enumerate(parts, 1):
+        try:
+            modname = ".".join(parts[:i])
+            import_module(modname)
+        except ImportError:
+            return ".".join(parts[:i - 1]), ".".join(parts[i - 1:])
+
+    return name, ""
+
+
 def encode_uri(uri: str) -> str:
     split = list(urlsplit(uri))
     split[1] = split[1].encode('idna').decode('ascii')

tests/roots/test-ext-autosummary/autosummary_dummy_module.py

@@ -3,6 +3,9 @@ from typing import Union
 
 
 class Foo:
+    class Bar:
+        pass
+
     def __init__(self):
         pass
 

tests/roots/test-ext-autosummary/index.rst

@@ -9,5 +9,6 @@
 
    autosummary_dummy_module
    autosummary_dummy_module.Foo
+   autosummary_dummy_module.Foo.Bar
    autosummary_dummy_module.bar
    autosummary_importfail

tests/test_ext_autosummary.py

@@ -203,6 +203,7 @@ def test_autosummary_generate(app, status, warning):
                 [autosummary_table, nodes.table, nodes.tgroup, (nodes.colspec,
                                                                 nodes.colspec,
                                                                 [nodes.tbody, (nodes.row,
+                                                                               nodes.row,
                                                                                nodes.row,
                                                                                nodes.row,
                                                                                nodes.row)])])
@@ -210,8 +211,9 @@ def test_autosummary_generate(app, status, warning):
 
     assert doctree[3][0][0][2][0].astext() == 'autosummary_dummy_module\n\n'
     assert doctree[3][0][0][2][1].astext() == 'autosummary_dummy_module.Foo()\n\n'
-    assert doctree[3][0][0][2][2].astext() == 'autosummary_dummy_module.bar(x[, y])\n\n'
-    assert doctree[3][0][0][2][3].astext() == 'autosummary_importfail\n\n'
+    assert doctree[3][0][0][2][2].astext() == 'autosummary_dummy_module.Foo.Bar\n\n'
+    assert doctree[3][0][0][2][3].astext() == 'autosummary_dummy_module.bar(x[, y])\n\n'
+    assert doctree[3][0][0][2][4].astext() == 'autosummary_importfail\n\n'
 
     module = (app.srcdir / 'generated' / 'autosummary_dummy_module.rst').read_text()
     assert ('   .. autosummary::\n'
@@ -231,6 +233,11 @@ def test_autosummary_generate(app, status, warning):
             '      ~Foo.baz\n'
             '   \n' in Foo)
 
+    FooBar = (app.srcdir / 'generated' / 'autosummary_dummy_module.Foo.Bar.rst').read_text()
+    assert ('.. currentmodule:: autosummary_dummy_module\n'
+            '\n'
+            '.. autoclass:: Foo.Bar\n' in FooBar)
+
 
 @pytest.mark.sphinx('dummy', testroot='ext-autosummary',
                     confoverrides={'autosummary_generate_overwrite': False})