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qapi: Use predicate callback to determine visit filtering

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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>
This commit is contained in:
Eric Blake 2015-10-12 22:22:21 -06:00 • committed by Markus Armbruster
parent d08ac81a45
commit 25a0d9c977
4 changed files with 33 additions and 20 deletions
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5
scripts/qapi-introspect.py
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@ -54,7 +54,6 @@ class QAPISchemaGenIntrospectVisitor(QAPISchemaVisitor):
self._jsons = []
self._used_types = []
self._name_map = {}
return QAPISchemaType # don't visit types for now
def visit_end(self):
# visit the types that are actually used
@ -82,6 +81,10 @@ const char %(c_name)s[] = %(c_string)s;
self._used_types = None
self._name_map = None
def visit_needed(self, entity):
# Ignore types on first pass; visit_end() will pick up used types
return not isinstance(entity, QAPISchemaType)
def _name(self, name):
if self._unmask:
return name