qapi/events.py: add type hint annotations

Annotations do not change runtime behavior.
This commit *only* adds annotations.

Note: __init__ does not need its return type annotated, as it is special.
https://mypy.readthedocs.io/en/stable/class_basics.html#annotating-init-methods

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Message-Id: <20201009161558.107041-20-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 35 insertions, 11 deletions

diff --git a/scripts/qapi/events.py b/scripts/qapi/events.py
index f840a62ed9..57e0939e96 100644
--- a/scripts/qapi/events.py
+++ b/scripts/qapi/events.py
@@ -12,19 +12,31 @@ This work is licensed under the terms of the GNU GPL, version 2.
 See the COPYING file in the top-level directory.
 """
 
+from typing import List
+
 from .common import c_enum_const, c_name, mcgen
 from .gen import QAPISchemaModularCVisitor, build_params, ifcontext
-from .schema import QAPISchemaEnumMember
+from .schema import (
+    QAPISchema,
+    QAPISchemaEnumMember,
+    QAPISchemaFeature,
+    QAPISchemaObjectType,
+)
+from .source import QAPISourceInfo
 from .types import gen_enum, gen_enum_lookup
 
 
-def build_event_send_proto(name, arg_type, boxed):
+def build_event_send_proto(name: str,
+                           arg_type: QAPISchemaObjectType,
+                           boxed: bool) -> str:
     return 'void qapi_event_send_%(c_name)s(%(param)s)' % {
         'c_name': c_name(name.lower()),
         'param': build_params(arg_type, boxed)}
 
 
-def gen_event_send_decl(name, arg_type, boxed):
+def gen_event_send_decl(name: str,
+                        arg_type: QAPISchemaObjectType,
+                        boxed: bool) -> str:
     return mcgen('''
 
 %(proto)s;
@@ -33,7 +45,7 @@ def gen_event_send_decl(name, arg_type, boxed):
 
 
 # Declare and initialize an object 'qapi' using parameters from build_params()
-def gen_param_var(typ):
+def gen_param_var(typ: QAPISchemaObjectType) -> str:
     assert not typ.variants
     ret = mcgen('''
     %(c_name)s param = {
@@ -61,7 +73,11 @@ def gen_param_var(typ):
     return ret
 
 
-def gen_event_send(name, arg_type, boxed, event_enum_name, event_emit):
+def gen_event_send(name: str,
+                   arg_type: QAPISchemaObjectType,
+                   boxed: bool,
+                   event_enum_name: str,
+                   event_emit: str) -> str:
     # FIXME: Our declaration of local variables (and of 'errp' in the
     # parameter list) can collide with exploded members of the event's
     # data type passed in as parameters.  If this collision ever hits in
@@ -137,15 +153,15 @@ def gen_event_send(name, arg_type, boxed, event_enum_name, event_emit):
 
 class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
 
-    def __init__(self, prefix):
+    def __init__(self, prefix: str):
         super().__init__(
             prefix, 'qapi-events',
             ' * Schema-defined QAPI/QMP events', None, __doc__)
         self._event_enum_name = c_name(prefix + 'QAPIEvent', protect=False)
-        self._event_enum_members = []
+        self._event_enum_members: List[QAPISchemaEnumMember] = []
         self._event_emit_name = c_name(prefix + 'qapi_event_emit')
 
-    def _begin_user_module(self, name):
+    def _begin_user_module(self, name: str) -> None:
         events = self._module_basename('qapi-events', name)
         types = self._module_basename('qapi-types', name)
         visit = self._module_basename('qapi-visit', name)
@@ -168,7 +184,7 @@ class QAPISchemaGenEventVisitor(QAPISchemaModularCVisitor):
 ''',
                              types=types))
 
-    def visit_end(self):
+    def visit_end(self) -> None:
         self._add_system_module('emit', ' * QAPI Events emission')
         self._genc.preamble_add(mcgen('''
 #include "qemu/osdep.h"
@@ -189,7 +205,13 @@ void %(event_emit)s(%(event_enum)s event, QDict *qdict);
                              event_emit=self._event_emit_name,
                              event_enum=self._event_enum_name))
 
-    def visit_event(self, name, info, ifcond, features, arg_type, boxed):
+    def visit_event(self,
+                    name: str,
+                    info: QAPISourceInfo,
+                    ifcond: List[str],
+                    features: List[QAPISchemaFeature],
+                    arg_type: QAPISchemaObjectType,
+                    boxed: bool) -> None:
         with ifcontext(ifcond, self._genh, self._genc):
             self._genh.add(gen_event_send_decl(name, arg_type, boxed))
             self._genc.add(gen_event_send(name, arg_type, boxed,
@@ -200,7 +222,9 @@ void %(event_emit)s(%(event_enum)s event, QDict *qdict);
         self._event_enum_members.append(QAPISchemaEnumMember(name, None))
 
 
-def gen_events(schema, output_dir, prefix):
+def gen_events(schema: QAPISchema,
+               output_dir: str,
+               prefix: str) -> None:
     vis = QAPISchemaGenEventVisitor(prefix)
     schema.visit(vis)
     vis.write(output_dir)