for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
from .._match_failure import MatchFailure
from .basic_patterns import DISCARD
from .compound_match import CompoundMatch
class Guard(CompoundMatch, tuple):
__slots__ = ()
def __new__(cls, guard, structure=DISCARD):
if structure is not DISCARD:
return AsGuard(guard, structure)
return super().__new__(cls, (guard,))
def __getitem__(self, key):
return Guard(self.guard, key)
@property
def guard(self):
return tuple.__getitem__(self, 0)
def destructure(self, value):
if value is self or self.guard(value):
return ()
raise MatchFailure
class AsGuard(CompoundMatch, tuple):
def __new__(cls, guard, structure):
return super().__new__(cls, (guard, structure))
return self[0]
def structure(self):
return self[1]
if value is self:
return (self.structure,)
if self.guard(value):
return (value,)
mwchase /
python-structured-data
