Data.Machine.Type

Machines

newtype MachineT m k o

A MachineT reads from a number of inputs and may yield results before stopping with monadic side-effects.

Constructors

MachineT

Fields

runMachineT :: m (Step k o (MachineT m k o))

Instances

Monad m => Functor (MachineT m k)

(Functor (MachineT m k), Monad m, Appliance k) => Applicative (MachineT m k)

~ (* -> *) m Identity => Foldable (MachineT m k)

This permits toList to be used on a Machine.

Monad m => Pointed (MachineT m k)

data Step k o r

This is the base functor for a Machine or MachineT.

Note: A Machine is usually constructed from Plan, so it does not need to be CPS'd.

Constructors

Stop

Yield o r

forall t . Await (t -> r) (k t) r

Instances

Functor (Step k o)

type Machine k o = forall m. Monad m => MachineT m k o

A Machine reads from a number of inputs and may yield results before stopping.

A Machine can be used as a MachineT m for any Monad m.

runT_ :: Monad m => MachineT m k b -> m ()

Stop feeding input into model, taking only the effects.

runT :: Monad m => MachineT m k b -> m [b]

Stop feeding input into model and extract an answer

run :: MachineT Identity k b -> [b]

Run a pure machine and extract an answer.

runMachine :: MachineT Identity k o -> Step k o (MachineT Identity k o)

runMachine = runIdentity . runMachineT

encased :: Monad m => Step k o (MachineT m k o) -> MachineT m k o

Pack a Step of a Machine into a Machine.

Building machines from plans

construct :: Monad m => PlanT k o m a -> MachineT m k o

Compile a machine to a model.

repeatedly :: Monad m => PlanT k o m a -> MachineT m k o

Generates a model that runs a machine until it stops, then start it up again.

repeatedly m = construct (forever m)

before :: Monad m => MachineT m k o -> PlanT k o m a -> MachineT m k o

Evaluate a machine until it stops, and then yield answers according to the supplied model.

Reshaping machines

fit :: Monad m => (forall a. k a -> k' a) -> MachineT m k o -> MachineT m k' o

Connect different kinds of machines.

fit id = id

pass :: k o -> Machine k o

Given a handle, ignore all other inputs and just stream input from that handle.

 pass id :: Process a a
 pass L  :: Tee a b a
 pass R  :: Tee a b b
 pass X  :: Wye a b a
 pass Y  :: Wye a b b
 pass Z  :: Wye a b (Either a b)

stopped :: Machine k b

This is a stopped Machine

Applicative Machines

class Appliance k where

An input type that supports merging requests from multiple machines.

Methods

applied :: Monad m => MachineT m k (a -> b) -> MachineT m k a -> MachineT m k b