def encode(self, module: abc.MutableMapping) -> str:
"""Extends the parent function, by adding a restriction.
For PDS, if there are any GROUP elements, there must be at
least one OBJECT element in the label. Behavior here
depends on the value of this encoder's convert_group_to_object
property.
"""
(obj_count, grp_count) = self.count_aggs(module)
if grp_count > 0 and obj_count < 1:
if self.convert_group_to_object:
for k, v in module.items():
# First try to convert any GROUPs that would not
# be valid PDS GROUPs.
if isinstance(v, self.grpcls) and not self.is_PDSgroup(v):
module[k] = self.objcls(v)
break
else:
# Then just convert the first GROUP
for k, v in module.items():
if isinstance(v, self.grpcls):
module[k] = self.objcls(v)
break
else:
raise ValueError("Couldn't convert any of the GROUPs "
"to OBJECTs.")
else:
raise ValueError("This module has a GROUP element, but no "
"OBJECT elements, which is not allowed by "
"the PDS. You could set "
"*convert_group_to_object* to *True* on the "
"encoder to try and convert a GROUP "
"to an OBJECT.")
s = super().encode(module)
if self.tab_replace > 0:
return s.replace("\t", (" " * self.tab_replace))
else:
return s
def items(self):
"""Explicit use of MutableMapping attributes."""
return MutableMapping.items(self)