[RFC PATCH v2 20/35] docs/qapi-domain: add qapi:event directive

[John Snow]

Adds the .. qapi:event:: directive, object, and :qapi:event:`name`
cross-referencing role.

Adds the :memb type name: field list syntax for documenting event data
members. As this syntax and phrasing will be shared with Structs and
Unions as well, add the field list definition to a shared abstract
class.

As per usual, QAPI cross-referencing for types in the member field list
will be added in a forthcoming commit.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/sphinx/qapi-domain.py | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/docs/sphinx/qapi-domain.py b/docs/sphinx/qapi-domain.py
index e0c31b2ee4d..e042421016f 100644
--- a/docs/sphinx/qapi-domain.py
+++ b/docs/sphinx/qapi-domain.py
@@ -321,6 +321,29 @@ class QAPIAlternate(QAPIObject):
     )
 
 
+class QAPIObjectWithMembers(QAPIObject):
+    """Base class for Events/Structs/Unions"""
+
+    doc_field_types = QAPIObject.doc_field_types.copy()
+    doc_field_types.extend(
+        [
+            # :member type name: descr
+            TypedField(
+                "member",
+                label=_("Members"),
+                names=("memb",),
+                can_collapse=False,
+            ),
+        ]
+    )
+
+
+class QAPIEvent(QAPIObjectWithMembers):
+    """Description of a QAPI Event."""
+
+    pass
+
+
 class QAPIModule(SphinxDirective):
     """
     Directive to mark description of a new module.
@@ -481,6 +504,7 @@ class QAPIDomain(Domain):
     object_types: Dict[str, ObjType] = {
         "module": ObjType(_("module"), "mod", "obj"),
         "command": ObjType(_("command"), "cmd", "obj"),
+        "event": ObjType(_("event"), "event", "obj"),
         "enum": ObjType(_("enum"), "enum", "obj", "type"),
         "alternate": ObjType(_("alternate"), "alt", "obj", "type"),
     }
@@ -490,6 +514,7 @@ class QAPIDomain(Domain):
     directives = {
         "module": QAPIModule,
         "command": QAPICommand,
+        "event": QAPIEvent,
         "enum": QAPIEnum,
         "alternate": QAPIAlternate,
     }
@@ -500,6 +525,7 @@ class QAPIDomain(Domain):
     roles = {
         "mod": QAPIXRefRole(),
         "cmd": QAPIXRefRole(),
+        "event": QAPIXRefRole(),
         "enum": QAPIXRefRole(),
         "alt": QAPIXRefRole(),
         # reference any data type (excludes modules, commands, events)
-- 
2.47.0