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qapi/schema: adjust type narrowing for mypy's benefit 

We already take care to perform some type narrowing for arg_type and
ret_type, but not in a way where mypy can utilize the result once we add
type hints, e.g.:

qapi/schema.py:833: error: Incompatible types in assignment (expression
has type "QAPISchemaType", variable has type
"Optional[QAPISchemaObjectType]") [assignment]

qapi/schema.py:893: error: Incompatible types in assignment (expression
has type "QAPISchemaType", variable has type
"Optional[QAPISchemaObjectType]") [assignment]

A simple change to use a temporary variable helps the medicine go down.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240315152301.3621858-10-armbru@redhat.com>
This commit is contained in:
John Snow 2024-03-15 16:22:45 +01:00 committed by Markus Armbruster
parent d150be3d54
commit 9bda6c7d11
1 changed files with 9 additions and 7 deletions
scripts/qapi
schema.py

16
scripts/qapi/schema.py
View File

@ -843,13 +843,14 @@ class QAPISchemaCommand(QAPISchemaDefinition):
def check(self, schema):
super().check(schema)
if self._arg_type_name:
self.arg_type = schema.resolve_type(
arg_type = schema.resolve_type(
self._arg_type_name, self.info, "command's 'data'")
if not isinstance(self.arg_type, QAPISchemaObjectType):
if not isinstance(arg_type, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"command's 'data' cannot take %s"
% self.arg_type.describe())
% arg_type.describe())
self.arg_type = arg_type
if self.arg_type.variants and not self.boxed:
raise QAPISemError(
self.info,
@ -866,8 +867,8 @@ class QAPISchemaCommand(QAPISchemaDefinition):
if self.name not in self.info.pragma.command_returns_exceptions:
typ = self.ret_type
if isinstance(typ, QAPISchemaArrayType):
typ = self.ret_type.element_type
assert typ
typ = typ.element_type
if not isinstance(typ, QAPISchemaObjectType):
raise QAPISemError(
self.info,
@ -903,13 +904,14 @@ class QAPISchemaEvent(QAPISchemaDefinition):
def check(self, schema):
super().check(schema)
if self._arg_type_name:
self.arg_type = schema.resolve_type(
typ = schema.resolve_type(
self._arg_type_name, self.info, "event's 'data'")
if not isinstance(self.arg_type, QAPISchemaObjectType):
if not isinstance(typ, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"event's 'data' cannot take %s"
% self.arg_type.describe())
% typ.describe())
self.arg_type = typ
if self.arg_type.variants and not self.boxed:
raise QAPISemError(
self.info,