def __init__(self):
self.empty = empty
self.lit = memoize(_lit)
self.mkalt = memoize(self._alt)
self.mkseq = memoize(self._seq)
self.mkmany = memoize(self._many)
def __init__(self):
self.empty = empty
self.lit = memoize(_lit)
self.mkalt = memoize(self._alt)
self.mkseq = memoize(self._seq)
self.mkmany = memoize(self._many)
def mark(nullable, deriv, tag, args):
deriv.nullable = nullable
deriv.tag = tag
deriv.args = args
deriv.deriv = memoize(deriv)
return deriv
def mark(nullable, deriv, tag, args):
deriv.nullable = nullable
deriv.tag = tag
deriv.args = args
deriv.deriv = memoize(deriv)
return deriv