def strip_sources(obj):
if isinstance(obj, HasSource):
return obj.without_source()
elif type(obj) is str:
return obj
elif isiterable(obj):
return list(strip_sources(o) for o in obj)
else:
return obj
def reduce_to_text(obj):
if hasattr(obj, 'reduced_to_text'):
return obj.reduced_to_text
elif hasattr(obj, 'text'):
return obj.text
elif type(obj) is str:
return obj
elif isinstance(obj, Multiple):
return Multiple(*(reduce_to_text(o) for o in obj))
elif isiterable(obj):
return list(reduce_to_text(o) for o in obj)
else:
return obj
def force_source_from(obj):
try:
return obj.source
except AttributeError:
if type(obj) is str:
return None
elif isiterable(obj):
try:
return force_source_from(obj[0])
except IndexError:
return None
else:
return None