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from ._adt_constructor import ADTConstructor
from ._match_failure import MatchFailure
from ._patterns import AsPattern
from ._unpack import unpack
class Processor:
def __init__(self, target):
self.target = target
def __call__(self, value):
raise NotImplementedError
type = None
class AsPatternProcessor(Processor):
if self.target is value:
return reversed(self.target)
return (value, value)
type = AsPattern
class ADTProcessor(Processor):
if value.__class__ is not self.target.__class__:
raise MatchFailure
return reversed(unpack(value))
type = ADTConstructor
class TupleProcessor(Processor):
if isinstance(value, self.target.__class__) and len(self.target) == len(value):
return reversed(value)
type = tuple
class ProcessorList:
def __init__(self, processors=()):
self.processors = tuple(processors)
def get_processor(self, item):
for processor in self.processors:
if isinstance(item, processor.type):
return processor(item)
return None
PROCESSORS = ProcessorList((
AsPatternProcessor,
ADTProcessor,
TupleProcessor,
))
mwchase /
python-structured-data
