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qapi: Track enum values by QAPISchemaMember, not string

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Rather than using just an array of strings, make enum.values be
an array of the new QAPISchemaMember type, and add a helper
member_names() method to get back at the original list of names.
Likewise, creating an enum requires wrapping strings, via a new
QAPISchema._make_enum_members() method.  The benefit of wrapping
enum members in a QAPISchemaMember Python object is that we now
share the existing code for C name clash detection (although the
code is not yet active until a later commit removes the earlier
ad hoc parser checks).

In a related change, the QAPISchemaMember._pretty_owner() method
needs to learn about one more implicit type name: the generated
enum associated with a simple union.

In the interest of keeping the changes of this patch local to one
file, the visitor interface still passes just a list of names
rather than the full list of QAPISchemaMember instances.  We may
want to revisit this in the future, if the consistency with
visit_object_type() is worth it.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1449033659-25497-12-git-send-email-eblake@redhat.com>
[Eric's simplifying followup squashed in]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-12-01 22:20:55 -07:00 committed by Markus Armbruster
parent d44f9ac80c
commit 93bda4dd46
1 changed files with 26 additions and 11 deletions
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37
scripts/qapi.py
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@ -901,13 +901,16 @@ class QAPISchemaEnumType(QAPISchemaType):
def __init__(self, name, info, values, prefix):
QAPISchemaType.__init__(self, name, info)
for v in values:
assert isinstance(v, str)
assert isinstance(v, QAPISchemaMember)
v.set_owner(name)
assert prefix is None or isinstance(prefix, str)
self.values = values
self.prefix = prefix
def check(self, schema):
assert len(set(self.values)) == len(self.values)
seen = {}
for v in self.values:
v.check_clash(self.info, seen)
def is_implicit(self):
# See QAPISchema._make_implicit_enum_type()
@ -916,8 +919,11 @@ class QAPISchemaEnumType(QAPISchemaType):
def c_type(self, is_param=False):
return c_name(self.name)
def member_names(self):
return [v.name for v in self.values]
def c_null(self):
return c_enum_const(self.name, (self.values + ['_MAX'])[0],
return c_enum_const(self.name, (self.member_names() + ['_MAX'])[0],
self.prefix)
def json_type(self):
@ -925,7 +931,7 @@ class QAPISchemaEnumType(QAPISchemaType):
def visit(self, visitor):
visitor.visit_enum_type(self.name, self.info,
self.values, self.prefix)
self.member_names(), self.prefix)
class QAPISchemaArrayType(QAPISchemaType):
@ -1050,6 +1056,9 @@ class QAPISchemaMember(object):
assert owner.endswith('-wrapper')
# Unreachable and not implemented
assert False
if owner.endswith('Kind'):
# See QAPISchema._make_implicit_enum_type()
return '(branch of %s)' % owner[:-4]
return '(%s of %s)' % (self.role, owner)
def describe(self):
@ -1100,7 +1109,7 @@ class QAPISchemaObjectTypeVariants(object):
# Union names must match enum values; alternate names are
# checked separately. Use 'seen' to tell the two apart.
if seen:
assert v.name in self.tag_member.type.values
assert v.name in self.tag_member.type.member_names()
assert isinstance(v.type, QAPISchemaObjectType)
v.type.check(schema)
@ -1258,15 +1267,20 @@ class QAPISchema(object):
self.the_empty_object_type = QAPISchemaObjectType(':empty', None, None,
[], None)
self._def_entity(self.the_empty_object_type)
self._def_entity(QAPISchemaEnumType('QType', None,
['none', 'qnull', 'qint',
'qstring', 'qdict', 'qlist',
'qfloat', 'qbool'],
qtype_values = self._make_enum_members(['none', 'qnull', 'qint',
'qstring', 'qdict', 'qlist',
'qfloat', 'qbool'])
self._def_entity(QAPISchemaEnumType('QType', None, qtype_values,
'QTYPE'))
def _make_enum_members(self, values):
return [QAPISchemaMember(v) for v in values]
def _make_implicit_enum_type(self, name, info, values):
# See also QAPISchemaObjectTypeMember._pretty_owner()
name = name + 'Kind' # Use namespace reserved by add_name()
self._def_entity(QAPISchemaEnumType(name, info, values, None))
self._def_entity(QAPISchemaEnumType(
name, info, self._make_enum_members(values), None))
return name
def _make_array_type(self, element_type, info):
@ -1289,7 +1303,8 @@ class QAPISchema(object):
name = expr['enum']
data = expr['data']
prefix = expr.get('prefix')
self._def_entity(QAPISchemaEnumType(name, info, data, prefix))
self._def_entity(QAPISchemaEnumType(
name, info, self._make_enum_members(data), prefix))
def _make_member(self, name, typ, info):
optional = False