Add Support For Attributes In Docstrings

This allows class attributes to be defined in docstrings without causing
an exception while linking the source code.

Due to the non-static nature of attributes, it's not trivial to link
their actual definition, so the chosen lines will actually be all the
lines of the parent class.

Signed-off-by: Hassan Abouelela <hassan@hassanamr.com>

Author: HassanAbouelela

docs/utils.py

@@ -5,9 +5,11 @@
 import inspect
 import os
 import subprocess
+import types
 import typing
 from pathlib import Path
 
+import docstring_parser
 import docutils.nodes
 import docutils.parsers.rst.states
 import git
@@ -25,6 +27,18 @@ def get_build_root() -> Path:
     return root
 
 
+def is_attribute(module: types.ModuleType, parameter: str) -> bool:
+    """Returns true if `parameter` is an attribute of `module`."""
+    docs = docstring_parser.parse(inspect.getdoc(module), docstring_parser.DocstringStyle.GOOGLE)
+    for param in docs.params:
+        # The docstring_parser library can mis-parse arguments like `arg (:obj:`str`)` as `arg (`
+        # which would create a false-negative below, so we just strip away the extra parenthesis.
+        if param.args[0] == "attribute" and param.arg_name.rstrip(" (") == parameter:
+            return True
+
+    return False
+
+
 def linkcode_resolve(repo_link: str, domain: str, info: dict[str, str]) -> typing.Optional[str]:
     """
     Function called by linkcode to get the URL for a given resource.
@@ -59,7 +73,15 @@ def linkcode_resolve(repo_link: str, domain: str, info: dict[str, str]) -> typin
 
     symbol = [module]
     for name in symbol_name.split("."):
-        symbol.append(getattr(symbol[-1], name))
+        try:
+            symbol.append(getattr(symbol[-1], name))
+        except AttributeError as e:
+            # This could be caused by trying to link a class attribute
+            if is_attribute(symbol[-1], name):
+                break
+            else:
+                raise e
+
         symbol_name = name
 
     try: