qapi: Use predicate callback to determine visit filtering
Previously, qapi-types and qapi-visit filtered out implicit
objects during visit_object_type() by using 'info' (works since
implicit objects do not [yet] have associated info); meanwhile
qapi-introspect filtered out all schema types on the first pass
by returning a python type from visit_begin(), which was then
used at a distance in QAPISchema.visit() to do the filtering.
Rather than keeping these ad hoc approaches, add a new visitor
callback visit_needed() which returns False to skip a given
entity, and which defaults to True unless overridden. Use the
new mechanism to simplify all three filtering visitors.
No change to the generated code.
Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1444710158-8723-2-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 26cff3f..543b378 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -811,6 +811,10 @@
def visit_end(self):
pass
+ def visit_needed(self, entity):
+ # Default to visiting everything
+ return True
+
def visit_builtin_type(self, name, info, json_type):
pass
@@ -1304,10 +1308,10 @@
ent.check(self)
def visit(self, visitor):
- ignore = visitor.visit_begin(self)
- for name in sorted(self._entity_dict.keys()):
- if not ignore or not isinstance(self._entity_dict[name], ignore):
- self._entity_dict[name].visit(visitor)
+ visitor.visit_begin(self)
+ for (name, entity) in sorted(self._entity_dict.items()):
+ if visitor.visit_needed(entity):
+ entity.visit(visitor)
visitor.visit_end()