def visit_AttrDelete(self, node):
if node.attr not in self.objrels.Fs:
return
lookup = L.Attribute(node.obj, node.attr)
pair = L.Tuple([node.obj, lookup])
var = next(self.fresh_vars)
return (L.Assign(var, pair),
L.RelUpdate(N.F(node.attr), L.SetRemove(), var))
def get_code(self, cl, bindenv, body):
vars = self.lhs_vars(cl)
assert_unique(vars)
mask = L.mask_from_bounds(vars, bindenv)
if L.mask_is_allbound(mask):
comparison = L.Compare(L.Name(cl.value), L.Eq(),
L.Attribute(L.Name(cl.obj), cl.attr))
code = (L.If(comparison, body, ()), )
needs_typecheck = True
elif mask == L.mask('bu'):
code = (L.Assign(cl.value, L.Attribute(L.Name(cl.obj), cl.attr)), )
code += body
needs_typecheck = True
else:
code = super().get_code(cl, bindenv, body)
needs_typecheck = False
if needs_typecheck and self.use_typecheck:
code = (L.If(L.HasField(L.Name(cl.obj), cl.attr), code, ()), )
return code