Copyright	(C) 2012 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	portable
Safe Haskell	Safe-Inferred
Language	Haskell2010

Data.Machine.Mealy

Description

http://en.wikipedia.org/wiki/Mealy_machine

Synopsis

newtype Mealy a b = Mealy {
- runMealy :: a -> (b, Mealy a b)
}
unfoldMealy :: (s -> a -> (b, s)) -> s -> Mealy a b
logMealy :: Semigroup a => Mealy a a

Documentation

newtype Mealy a b Source #

Mealy machines

Examples

We can enumerate inputs:

>>> let countingMealy = unfoldMealy (\i x -> ((i, x), i + 1)) 0
>>> run (auto countingMealy <~ source "word")
[(0,'w'),(1,'o'),(2,'r'),(3,'d')]

Constructors

Mealy
Fields runMealy :: a -> (b, Mealy a b)

Instances

Instances details

Arrow Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods arr :: (b -> c) -> Mealy b c # first :: Mealy b c -> Mealy (b, d) (c, d) # second :: Mealy b c -> Mealy (d, b) (d, c) # (***) :: Mealy b c -> Mealy b' c' -> Mealy (b, b') (c, c') # (&&&) :: Mealy b c -> Mealy b c' -> Mealy b (c, c') #
ArrowChoice Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods left :: Mealy b c -> Mealy (Either b d) (Either c d) # right :: Mealy b c -> Mealy (Either d b) (Either d c) # (+++) :: Mealy b c -> Mealy b' c' -> Mealy (Either b b') (Either c c') # (\|\|\|) :: Mealy b d -> Mealy c d -> Mealy (Either b c) d #
ArrowApply Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods app :: Mealy (Mealy b c, b) c #
Profunctor Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods dimap :: (a -> b) -> (c -> d) -> Mealy b c -> Mealy a d # lmap :: (a -> b) -> Mealy b c -> Mealy a c # rmap :: (b -> c) -> Mealy a b -> Mealy a c # (#.) :: forall a b c q. Coercible c b => q b c -> Mealy a b -> Mealy a c # (.#) :: forall a b c q. Coercible b a => Mealy b c -> q a b -> Mealy a c #
Corepresentable Mealy Source #
Instance details Defined in Data.Machine.Mealy Associated Types type Corep Mealy :: Type -> Type # Methods cotabulate :: (Corep Mealy d -> c) -> Mealy d c #
Choice Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods left' :: Mealy a b -> Mealy (Either a c) (Either b c) # right' :: Mealy a b -> Mealy (Either c a) (Either c b) #
Closed Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods closed :: Mealy a b -> Mealy (x -> a) (x -> b) #
Strong Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods first' :: Mealy a b -> Mealy (a, c) (b, c) # second' :: Mealy a b -> Mealy (c, a) (c, b) #
Costrong Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods unfirst :: Mealy (a, d) (b, d) -> Mealy a b # unsecond :: Mealy (d, a) (d, b) -> Mealy a b #
Automaton Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods auto :: Mealy a b -> Process a b Source #
Cosieve Mealy NonEmpty Source #
Instance details Defined in Data.Machine.Mealy Methods cosieve :: Mealy a b -> NonEmpty a -> b #
Functor (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy Methods fmap :: (a0 -> b) -> Mealy a a0 -> Mealy a b # (<$) :: a0 -> Mealy a b -> Mealy a a0 #
Applicative (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy Methods pure :: a0 -> Mealy a a0 # (<>) :: Mealy a (a0 -> b) -> Mealy a a0 -> Mealy a b # liftA2 :: (a0 -> b -> c) -> Mealy a a0 -> Mealy a b -> Mealy a c # (>) :: Mealy a a0 -> Mealy a b -> Mealy a b # (<*) :: Mealy a a0 -> Mealy a b -> Mealy a a0 #
Distributive (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy Methods distribute :: Functor f => f (Mealy a a0) -> Mealy a (f a0) # collect :: Functor f => (a0 -> Mealy a b) -> f a0 -> Mealy a (f b) # distributeM :: Monad m => m (Mealy a a0) -> Mealy a (m a0) # collectM :: Monad m => (a0 -> Mealy a b) -> m a0 -> Mealy a (m b) #
Representable (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy Associated Types type Rep (Mealy a) # Methods tabulate :: (Rep (Mealy a) -> a0) -> Mealy a a0 # index :: Mealy a a0 -> Rep (Mealy a) -> a0 #
Pointed (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy Methods point :: a0 -> Mealy a a0 #
Extend (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy Methods duplicated :: Mealy a a0 -> Mealy a (Mealy a a0) # extended :: (Mealy a a0 -> b) -> Mealy a a0 -> Mealy a b #
Category Mealy Source #
Instance details Defined in Data.Machine.Mealy Methods id :: forall (a :: k). Mealy a a # (.) :: forall (b :: k) (c :: k) (a :: k). Mealy b c -> Mealy a b -> Mealy a c #
Semigroup b => Semigroup (Mealy a b) Source #
Instance details Defined in Data.Machine.Mealy Methods (<>) :: Mealy a b -> Mealy a b -> Mealy a b # sconcat :: NonEmpty (Mealy a b) -> Mealy a b # stimes :: Integral b0 => b0 -> Mealy a b -> Mealy a b #
Monoid b => Monoid (Mealy a b) Source #
Instance details Defined in Data.Machine.Mealy Methods mempty :: Mealy a b # mappend :: Mealy a b -> Mealy a b -> Mealy a b # mconcat :: [Mealy a b] -> Mealy a b #
type Corep Mealy Source #
Instance details Defined in Data.Machine.Mealy type Corep Mealy = NonEmpty
type Rep (Mealy a) Source #
Instance details Defined in Data.Machine.Mealy type Rep (Mealy a) = NonEmpty a

unfoldMealy :: (s -> a -> (b, s)) -> s -> Mealy a b Source #

A Mealy machine modeled with explicit state.

logMealy :: Semigroup a => Mealy a a Source #

Accumulate history.

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