Autodoc: Support typing_extensions.overload

CHANGES.rst

@@ -19,6 +19,9 @@ Features added
 * #13439: linkcheck: Permit warning on every redirect with
   ``linkcheck_allowed_redirects = {}``.
   Patch by Adam Turner.
+* #13704: Autodoc: Detect :py:func:`typing_extensions.overload <typing.overload>`
+  and :py:func:`~typing.final` decorators.
+  Patch by Spencer Brown.
 
 Bugs fixed
 ----------

sphinx/pycode/parser.py

@@ -247,9 +247,9 @@ def __init__(self, buffers: list[str], encoding: str) -> None:
         self.deforders: dict[str, int] = {}
         self.finals: list[str] = []
         self.overloads: dict[str, list[Signature]] = {}
-        self.typing: str | None = None
-        self.typing_final: str | None = None
-        self.typing_overload: str | None = None
+        self.typing_mods: set[str] = set()
+        self.typing_final_names: set[str] = set()
+        self.typing_overload_names: set[str] = set()
         super().__init__()
 
     def get_qualname_for(self, name: str) -> list[str] | None:
@@ -295,12 +295,9 @@ def add_variable_annotation(self, name: str, annotation: ast.AST) -> None:
             self.annotations[basename, name] = ast_unparse(annotation)
 
     def is_final(self, decorators: list[ast.expr]) -> bool:
-        final = []
-        if self.typing:
-            final.append('%s.final' % self.typing)
-        if self.typing_final:
-            final.append(self.typing_final)
-
+        final = self.typing_final_names | {
+            f'{modname}.final' for modname in self.typing_mods
+        }
         for decorator in decorators:
             try:
                 if ast_unparse(decorator) in final:
@@ -311,11 +308,9 @@ def is_final(self, decorators: list[ast.expr]) -> bool:
         return False
 
     def is_overload(self, decorators: list[ast.expr]) -> bool:
-        overload = []
-        if self.typing:
-            overload.append('%s.overload' % self.typing)
-        if self.typing_overload:
-            overload.append(self.typing_overload)
+        overload = self.typing_overload_names | {
+            f'{modname}.overload' for modname in self.typing_mods
+        }
 
         for decorator in decorators:
             try:
@@ -348,22 +343,24 @@ def visit_Import(self, node: ast.Import) -> None:
         for name in node.names:
             self.add_entry(name.asname or name.name)
 
-            if name.name == 'typing':
-                self.typing = name.asname or name.name
-            elif name.name == 'typing.final':
-                self.typing_final = name.asname or name.name
-            elif name.name == 'typing.overload':
-                self.typing_overload = name.asname or name.name
+            if name.name in {'typing', 'typing_extensions'}:
+                self.typing_mods.add(name.asname or name.name)
+            elif name.name in {'typing.final', 'typing_extensions.final'}:
+                self.typing_final_names.add(name.asname or name.name)
+            elif name.name in {'typing.overload', 'typing_extensions.overload'}:
+                self.typing_overload_names.add(name.asname or name.name)
 
     def visit_ImportFrom(self, node: ast.ImportFrom) -> None:
         """Handles Import node and record the order of definitions."""
         for name in node.names:
             self.add_entry(name.asname or name.name)
 
-            if node.module == 'typing' and name.name == 'final':
-                self.typing_final = name.asname or name.name
-            elif node.module == 'typing' and name.name == 'overload':
-                self.typing_overload = name.asname or name.name
+            if node.module not in {'typing', 'typing_extensions'}:
+                continue
+            if name.name == 'final':
+                self.typing_final_names.add(name.asname or name.name)
+            elif name.name == 'overload':
+                self.typing_overload_names.add(name.asname or name.name)
 
     def visit_Assign(self, node: ast.Assign) -> None:
         """Handles Assign node and pick up a variable comment."""

tests/roots/test-ext-autodoc/target/final.py

@@ -3,6 +3,9 @@
 import typing
 from typing import final
 
+import typing_extensions
+from typing_extensions import final as final_ext  # noqa: UP035
+
 
 @typing.final
 class Class:
@@ -14,3 +17,11 @@ def meth1(self):
 
     def meth2(self):
         """docstring"""
+
+    @final_ext
+    def meth3(self):
+        """docstring"""
+
+    @typing_extensions.final
+    def meth4(self):
+        """docstring"""

tests/roots/test-ext-autodoc/target/overload3.py

@@ -0,0 +1,18 @@
+import typing
+from typing import TYPE_CHECKING, overload
+
+import typing_extensions
+from typing_extensions import overload as over_ext  # noqa: UP035
+
+
+@overload
+def test(x: int) -> int: ...
+@typing.overload
+def test(x: list[int]) -> list[int]: ...
+@over_ext
+def test(x: str) -> str: ...
+@typing_extensions.overload
+def test(x: float) -> float: ...
+def test(x):
+    """Documentation."""
+    return x

tests/test_extensions/test_ext_autodoc.py

@@ -2819,6 +2819,20 @@ def test_final(app):
         '',
         '      docstring',
         '',
+        '',
+        '   .. py:method:: Class.meth3()',
+        '      :module: target.final',
+        '      :final:',
+        '',
+        '      docstring',
+        '',
+        '',
+        '   .. py:method:: Class.meth4()',
+        '      :module: target.final',
+        '      :final:',
+        '',
+        '      docstring',
+        '',
     ]
 
 
@@ -2892,6 +2906,26 @@ def test_overload2(app):
     ]
 
 
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_overload3(app):
+    options = {'members': None}
+    actual = do_autodoc(app, 'module', 'target.overload3', options)
+    assert list(actual) == [
+        '',
+        '.. py:module:: target.overload3',
+        '',
+        '',
+        '.. py:function:: test(x: int) -> int',
+        '                 test(x: list[int]) -> list[int]',
+        '                 test(x: str) -> str',
+        '                 test(x: float) -> float',
+        '   :module: target.overload3',
+        '',
+        '   Documentation.',
+        '',
+    ]
+
+
 @pytest.mark.sphinx('html', testroot='ext-autodoc')
 def test_pymodule_for_ModuleLevelDocumenter(app):
     app.env.ref_context['py:module'] = 'target.classes'