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from ._enum_constructor import EnumConstructor
from ._match_failure import MatchFailure
from ._patterns import AsPattern
from ._unpack import unpack
def as_pattern_processor(target):
def processor(value):
if target is value:
yield target.match
yield target.matcher
else:
yield value
return processor
def enum_processor(target):
if value.__class__ is not target.__class__:
raise MatchFailure
yield from reversed(unpack(value))
def tuple_processor(target):
if isinstance(value, target.__class__) and len(target) == len(value):
yield from reversed(value)
class ProcessorList:
def __init__(self, processors=()):
self.processors = list(processors)
def get_processor(self, item):
for typ, meta_processor in self.processors:
if isinstance(item, typ):
return meta_processor(item)
return None
PROCESSORS = ProcessorList((
(AsPattern, as_pattern_processor),
(EnumConstructor, enum_processor),
(tuple, tuple_processor),
))
mwchase /
python-structured-data
