Utilities/Sphinx: Refactor Sphinx reference recording

Rewrite how we record objects in our Sphinx extensions to more closely
conform to how other domains do likewise, and to store more information
than was previously being stored.

This is a first step toward being able to record and reference
signatures.

Utilities/Sphinx/cmake.py

@@ -4,6 +4,9 @@
 import os
 import re
 
+from dataclasses import dataclass
+from typing import Any, cast
+
 # Override much of pygments' CMakeLexer.
 # We need to parse CMake syntax definitions, not CMake code.
 
@@ -69,9 +72,11 @@ from sphinx.directives import ObjectDescription, nl_escape_re
 from sphinx.domains import Domain, ObjType
 from sphinx.roles import XRefRole
 from sphinx.util.nodes import make_refnode
-from sphinx.util import ws_re
+from sphinx.util import logging, ws_re
 from sphinx import addnodes
 
+logger = logging.getLogger(__name__)
+
 sphinx_before_1_4 = False
 sphinx_before_1_7_2 = False
 try:
@@ -104,6 +109,14 @@ if sphinx_before_1_7_2:
     return new_items
   QtHelpBuilder.build_keywords = new_build_keywords
 
+@dataclass
+class ObjectEntry:
+    docname: str
+    objtype: str
+    node_id: str
+    name: str
+
+
 class CMakeModule(Directive):
     required_arguments = 1
     optional_arguments = 0
@@ -205,14 +218,6 @@ _cmake_index_objs = {
     'variable':   _cmake_index_entry('variable'),
     }
 
-def _cmake_object_inventory(env, document, line, objtype, targetid):
-    inv = env.domaindata['cmake']['objects']
-    if targetid in inv:
-        document.reporter.warning(
-            'CMake object "%s" also described in "%s".' %
-            (targetid, env.doc2path(inv[targetid][0])), line=line)
-    inv[targetid] = (env.docname, objtype)
-
 class CMakeTransform(Transform):
 
     # Run this transform early since we insert nodes we want
@@ -275,8 +280,10 @@ class CMakeTransform(Transform):
             indexnode = addnodes.index()
             indexnode['entries'] = [make_index_entry(title, targetid)]
             self.document.insert(0, indexnode)
+
             # Add to cmake domain object inventory
-            _cmake_object_inventory(env, self.document, 1, objtype, targetid)
+            domain = cast(CMakeDomain, env.get_domain('cmake'))
+            domain.note_object(objtype, targetname, targetid, targetid)
 
 class CMakeObject(ObjectDescription):
 
@@ -300,8 +307,10 @@ class CMakeObject(ObjectDescription):
             signode['ids'].append(targetid)
             signode['first'] = (not self.names)
             self.state.document.note_explicit_target(signode)
-            _cmake_object_inventory(self.env, self.state.document,
-                                    self.lineno, self.objtype, targetid)
+
+            domain = cast(CMakeDomain, self.env.get_domain('cmake'))
+            domain.note_object(self.objtype, targetname, targetid, targetid,
+                               location=signode)
 
         make_index_entry = _cmake_index_objs.get(self.objtype)
         if make_index_entry:
@@ -518,25 +527,37 @@ class CMakeDomain(Domain):
 
     def clear_doc(self, docname):
         to_clear = set()
-        for fullname, (fn, _) in self.data['objects'].items():
-            if fn == docname:
+        for fullname, obj in self.data['objects'].items():
+            if obj.docname == docname:
                 to_clear.add(fullname)
         for fullname in to_clear:
             del self.data['objects'][fullname]
 
     def resolve_xref(self, env, fromdocname, builder,
                      typ, target, node, contnode):
-        targetid = '%s:%s' % (typ, target)
+        targetid = f'{typ}:{target}'
         obj = self.data['objects'].get(targetid)
         if obj is None:
             # TODO: warn somehow?
             return None
-        return make_refnode(builder, fromdocname, obj[0], targetid,
+
+        return make_refnode(builder, fromdocname, obj.docname, obj.node_id,
                             contnode, target)
 
+    def note_object(self, objtype: str, name: str, target_id: str,
+                    node_id: str, location: Any = None):
+        if target_id in self.data['objects']:
+            other = self.data['objects'][target_id].docname
+            logger.warning(
+                f'CMake object {target_id!r} also described in {other!r}',
+                location=location)
+
+        self.data['objects'][target_id] = ObjectEntry(
+            self.env.docname, objtype, node_id, name)
+
     def get_objects(self):
-        for refname, (docname, type) in self.data['objects'].items():
-            yield (refname, refname, type, docname, refname, 1)
+        for refname, obj in self.data['objects'].items():
+            yield (refname, obj.name, obj.objtype, obj.docname, obj.node_id, 1)
 
 def setup(app):
     app.add_directive('cmake-module', CMakeModule)