def _combine_protocols(p1: Instance, p2: Instance) -> Instance:
def base_repr(base):
if 'pfun.Intersection' in base.type.fullname:
return ', '.join([repr(b) for b in base.type.bases])
return repr(base)
def get_bases(base):
if 'pfun.Intersection' in base.type.fullname:
bases = set()
for b in base.type.bases:
bases |= get_bases(b)
return bases
return set([base])
names = p1.type.names.copy()
names.update(p2.type.names)
keywords = p1.type.defn.keywords.copy()
keywords.update(p2.type.defn.keywords)
bases = get_bases(p1) | get_bases(p2)
bases_repr = ', '.join(sorted([repr(base) for base in bases]))
name = f'Intersection[{bases_repr}]'
defn = ClassDef(name, Block([]),
p1.type.defn.type_vars + p2.type.defn.type_vars,
[NameExpr(p1.type.fullname),
NameExpr(p2.type.fullname)], None, list(keywords.items()))
defn.fullname = f'pfun.{name}'
info = TypeInfo(names, defn, '')
info.is_protocol = True
info.is_abstract = True
info.bases = [p1, p2]
info.abstract_attributes = (p1.type.abstract_attributes +
p2.type.abstract_attributes)
calculate_mro(info)
return Instance(info, p1.args + p2.args)
def _create_intersection(args, context, api):
defn = ClassDef('Intersection', Block([]))
defn.fullname = 'pfun.Intersection'
info = TypeInfo({}, defn, 'pfun')
info.is_protocol = True
calculate_mro(info)
i = Instance(info, args, line=context.line, column=context.column)
intersection_translator = TranslateIntersection(api, i)
return i.accept(intersection_translator)
def visit_instance(self, t: Instance) -> Type:
if 'pfun.Intersection' == t.type.fullname:
args = [get_proper_type(arg) for arg in t.args]
if any(isinstance(arg, AnyType) for arg in args):
return AnyType(TypeOfAny.special_form)
if all(
hasattr(arg, 'type')
and arg.type.fullname == 'builtins.object'
for arg in args):
return args[0]
is_typevar = lambda arg: isinstance(arg, TypeVarType)
has_type_attr = lambda arg: hasattr(arg, 'type')
is_protocol = lambda arg: arg.type.is_protocol
is_object = lambda arg: arg.type.fullname == 'builtins.object'
if not all(
is_typevar(arg) or has_type_attr(arg) and
(is_protocol(arg) or is_object(arg)) for arg in args):
s = str(t)
if self.inferred:
msg = (f'All arguments to "Intersection" '
f'must be protocols but inferred "{s}"')
else:
msg = (f'All arguments to "Intersection" '
f'must be protocols, but got "{s}"')
self.api.msg.fail(msg, self.context)
return AnyType(TypeOfAny.special_form)
if not has_no_typevars(t):
return t
bases = []
for arg in args:
if arg in bases:
continue
bases.extend(self.get_bases(arg, []))
if len(bases) == 1:
return bases[0]
bases_repr = ', '.join([repr(base) for base in bases])
name = f'Intersection[{bases_repr}]'
defn = ClassDef(name, Block([]), [], [
NameExpr(arg.name) if isinstance(arg, TypeVarType) else
NameExpr(arg.type.fullname) for arg in args
], None, [])
defn.fullname = f'pfun.{name}'
info = TypeInfo({}, defn, '')
info.is_protocol = True
info.is_abstract = True
info.bases = bases
attrs = []
for base in bases:
if isinstance(base, TypeVarType):
continue
attrs.extend(base.type.abstract_attributes)
info.abstract_attributes = attrs
try:
calculate_mro(info)
except MroError:
self.api.msg.fail(
'Cannot determine consistent method resolution '
'order (MRO) for "%s"' % defn.fullname, self.context)
return AnyType(TypeOfAny.special_form)
return Instance(info, [])
return super().visit_instance(t)
