Constructor checking for AST validator

.github/workflows/test.yml

@@ -49,6 +49,7 @@ jobs:
       - name: Run test suite
         run: |
           pytest -v --pyargs numpydoc
+          pytest -v --pyargs numpydoc/tests/hooks
 
       - name: Test coverage
         run: |
@@ -95,12 +96,13 @@ jobs:
 
       - name: Install
         run: |
-          python -m pip install . --group test --group doc
+          python -m pip install . --pre --group test --group doc
           pip list
 
       - name: Run test suite
         run: |
-          pytest -v --pyargs .
+          pytest -v --pyargs numpydoc
+          pytest -v --pyargs numpydoc/tests/hooks
 
       - name: Test coverage
         run: |

numpydoc/tests/hooks/example_module.py

@@ -28,4 +28,35 @@ def create(self):
 
 
 class NewClass:
-    pass
+    class GoodConstructor:
+        """
+        A nested class to test constructors via AST hook.
+
+        Implements constructor via class docstring.
+
+        Parameters
+        ----------
+        name : str
+            The name of the new class.
+        """
+
+        def __init__(self, name):
+            self.name = name
+
+    class BadConstructor:
+        """
+        A nested class to test constructors via AST hook.
+
+        Implements a bad constructor docstring despite having a good class docstring.
+
+        Parameters
+        ----------
+        name : str
+            The name of the new class.
+        """
+
+        def __init__(self, name):
+            """
+            A failing constructor implementation without parameters.
+            """
+            self.name = name

numpydoc/tests/hooks/test_utils.py

@@ -23,7 +23,9 @@ def test_find_project_root(tmp_path, request, reason_file, files, expected_reaso
         (tmp_path / reason_file).touch()
 
     if files:
-        expected_dir = Path("/") if expected_reason == "file system root" else tmp_path
+        expected_dir = (
+            Path(tmp_path.anchor) if expected_reason == "file system root" else tmp_path
+        )
         for file in files:
             (tmp_path / file).touch()
     else:

numpydoc/tests/hooks/test_validate_hook.py

@@ -1,6 +1,7 @@
 """Test the numpydoc validate pre-commit hook."""
 
 import inspect
+import os
 from pathlib import Path
 
 import pytest
@@ -61,8 +62,24 @@ def test_validate_hook(example_module, config, capsys):
         numpydoc/tests/hooks/example_module.py:26: EX01 No examples section found
 
         numpydoc/tests/hooks/example_module.py:30: GL08 The object does not have a docstring
+
+        numpydoc/tests/hooks/example_module.py:31: SA01 See Also section not found
+
+        numpydoc/tests/hooks/example_module.py:31: EX01 No examples section found
+
+        numpydoc/tests/hooks/example_module.py:46: SA01 See Also section not found
+
+        numpydoc/tests/hooks/example_module.py:46: EX01 No examples section found
+
+        numpydoc/tests/hooks/example_module.py:58: ES01 No extended summary found
+
+        numpydoc/tests/hooks/example_module.py:58: PR01 Parameters {'name'} not documented
+
+        numpydoc/tests/hooks/example_module.py:58: SA01 See Also section not found
+
+        numpydoc/tests/hooks/example_module.py:58: EX01 No examples section found
         """
-    )
+    ).replace("/", os.sep)
 
     return_code = run_hook([example_module], config=config)
     assert return_code == 1
@@ -88,8 +105,10 @@ def test_validate_hook_with_ignore(example_module, capsys):
         numpydoc/tests/hooks/example_module.py:26: SS05 Summary must start with infinitive verb, not third person (e.g. use "Generate" instead of "Generates")
 
         numpydoc/tests/hooks/example_module.py:30: GL08 The object does not have a docstring
+
+        numpydoc/tests/hooks/example_module.py:58: PR01 Parameters {'name'} not documented
         """
-    )
+    ).replace("/", os.sep)
 
     return_code = run_hook([example_module], ignore=["ES01", "SA01", "EX01"])
 
@@ -132,7 +151,7 @@ def test_validate_hook_with_toml_config(example_module, tmp_path, capsys):
 
         numpydoc/tests/hooks/example_module.py:30: GL08 The object does not have a docstring
         """
-    )
+    ).replace("/", os.sep)
 
     return_code = run_hook([example_module], config=tmp_path)
     assert return_code == 1
@@ -167,7 +186,7 @@ def test_validate_hook_with_setup_cfg(example_module, tmp_path, capsys):
 
         numpydoc/tests/hooks/example_module.py:30: GL08 The object does not have a docstring
         """
-    )
+    ).replace("/", os.sep)
 
     return_code = run_hook([example_module], config=tmp_path)
     assert return_code == 1
@@ -208,7 +227,7 @@ def test_validate_hook_exclude_option_pyproject(example_module, tmp_path, capsys
 
         numpydoc/tests/hooks/example_module.py:30: GL08 The object does not have a docstring
         """
-    )
+    ).replace("/", os.sep)
 
     return_code = run_hook([example_module], config=tmp_path)
     assert return_code == 1
@@ -241,8 +260,11 @@ def test_validate_hook_exclude_option_setup_cfg(example_module, tmp_path, capsys
 
         numpydoc/tests/hooks/example_module.py:17: PR07 Parameter "*args" has no description
         """
-    )
+    ).replace("/", os.sep)
 
     return_code = run_hook([example_module], config=tmp_path)
     assert return_code == 1
     assert capsys.readouterr().err.strip() == expected
+
+
+# def test_validate_hook_

numpydoc/tests/test_validate.py

@@ -1305,6 +1305,69 @@ def __init__(self, param1: int):
         pass
 
 
+class ConstructorDocumentedinEmbeddedClass:  # ignore Gl08, ES01
+    """
+    Class to test the initialisation behaviour of a embedded class.
+    """
+
+    class EmbeddedClass1:  # ignore GL08, ES01
+        """
+        An additional level for embedded class documentation checking.
+        """
+
+        class EmbeddedClass2:
+            """
+            This is an embedded class.
+
+            Extended summary.
+
+            Parameters
+            ----------
+            param1 : int
+                Description of param1.
+
+            See Also
+            --------
+            otherclass : A class that does something else.
+
+            Examples
+            --------
+            This is an example of how to use EmbeddedClass.
+            """
+
+            def __init__(self, param1: int) -> None:
+                pass
+
+
+class IncompleteConstructorDocumentedinEmbeddedClass:
+    """
+    Class to test the initialisation behaviour of a embedded class.
+    """
+
+    class EmbeddedClass1:
+        """
+        An additional level for embedded class documentation checking.
+        """
+
+        class EmbeddedClass2:
+            """
+            This is an embedded class.
+
+            Extended summary.
+
+            See Also
+            --------
+            otherclass : A class that does something else.
+
+            Examples
+            --------
+            This is an example of how to use EmbeddedClass.
+            """
+
+            def __init__(self, param1: int) -> None:
+                pass
+
+
 class TestValidator:
     def _import_path(self, klass=None, func=None):
         """
@@ -1660,6 +1723,18 @@ def test_bad_docstrings(self, capsys, klass, func, msgs):
                 tuple(),
                 ("PR01"),  # Parameter not documented in class constructor
             ),
+            (
+                "ConstructorDocumentedinEmbeddedClass.EmbeddedClass1.EmbeddedClass2",
+                tuple(),
+                ("GL08",),
+                tuple(),
+            ),
+            (
+                "IncompleteConstructorDocumentedinEmbeddedClass.EmbeddedClass1.EmbeddedClass2",
+                ("GL08",),
+                tuple(),
+                ("PR01",),
+            ),
         ],
     )
     def test_constructor_docstrings(
@@ -1677,6 +1752,11 @@ def test_constructor_docstrings(
         for code in exc_init_codes:
             assert code not in " ".join(err[0] for err in result["errors"])
 
+        if klass == "ConstructorDocumentedinEmbeddedClass":
+            raise NotImplementedError(
+                "Test for embedded class constructor docstring not implemented yet."
+            )
+
 
 def decorator(x):
     """Test decorator."""

numpydoc/validate.py

@@ -572,6 +572,14 @@ def _check_desc(desc, code_no_desc, code_no_upper, code_no_period, **kwargs):
     return errs
 
 
+def _find_class_node(module_node: ast.AST, cls_name) -> ast.ClassDef:
+    #  Find the class node within a module, when checking constructor docstrings.
+    for node in ast.walk(module_node):
+        if isinstance(node, ast.ClassDef) and node.name == cls_name:
+            return node
+    raise ValueError(f"Could not find class node {cls_name}")
+
+
 def validate(obj_name, validator_cls=None, **validator_kwargs):
     """
     Validate the docstring.
@@ -639,20 +647,47 @@ def validate(obj_name, validator_cls=None, **validator_kwargs):
         report_GL08: bool = True
         # Check if the object is a class and has a docstring in the constructor
         # Also check if code_obj is defined, as undefined for the AstValidator in validate_docstrings.py.
-        if (
-            doc.name.endswith(".__init__")
-            and doc.is_function_or_method
-            and hasattr(doc, "code_obj")
-        ):
-            cls_name = doc.code_obj.__qualname__.split(".")[0]
-            cls = Validator._load_obj(f"{doc.code_obj.__module__}.{cls_name}")
-            # cls = Validator._load_obj(f"{doc.name[:-9]}.{cls_name}") ## Alternative
-            cls_doc = Validator(get_doc_object(cls))
+        if doc.name.endswith(".__init__") and doc.is_function_or_method:
+            from numpydoc.hooks.validate_docstrings import (
+                AstValidator,  # Support abstract syntax tree hook.
+            )
+
+            if hasattr(doc, "code_obj"):
+                cls_name = ".".join(
+                    doc.code_obj.__qualname__.split(".")[:-1]
+                )  # Collect all class depths before the constructor.
+                cls = Validator._load_obj(f"{doc.code_obj.__module__}.{cls_name}")
+                # cls = Validator._load_obj(f"{doc.name[:-9]}.{cls_name}") ## Alternative
+                cls_doc = Validator(get_doc_object(cls))
+            elif isinstance(doc, AstValidator):  # Supports class traversal for ASTs.
+                ancestry = doc.ancestry
+                if len(ancestry) > 2:  # e.g. module.class.__init__
+                    parent = doc.ancestry[-1]  # Get the parent
+                    cls_name = ".".join(
+                        [
+                            getattr(node, "name", node.__module__)
+                            for node in doc.ancestry
+                        ]
+                    )
+                    cls_doc = AstValidator(
+                        ast_node=parent,
+                        filename=doc.source_file_name,
+                        obj_name=cls_name,
+                        ancestry=doc.ancestry[:-1],
+                    )
+                else:
+                    # Ignore edge case: __init__ functions that don't belong to a class.
+                    cls_doc = None
+            else:
+                raise TypeError(
+                    f"Cannot load {doc.name} as a usable Validator object (Validator does not have `doc_obj` attr or type `AstValidator`)."
+                )
 
             # Parameter_mismatches, PR01, PR02, PR03 are checked for the class docstring.
             # If cls_doc has PR01, PR02, PR03 errors, i.e. invalid class docstring,
             # then we also report missing constructor docstring, GL08.
-            report_GL08 = len(cls_doc.parameter_mismatches) > 0
+            if cls_doc:
+                report_GL08 = len(cls_doc.parameter_mismatches) > 0
 
         # Check if GL08 is to be ignored:
         if "GL08" in ignore_validation_comments: