FRP.Yampa.Utilities

Derived utility definitions.

ToDo:

• Possibly add impulse :: VectorSpace a k => a -> Event a But to do that, we need access to Event, which we currently do not have.
• The general arrow utilities should be moved to a module FRP.Yampa.Utilities.
• I'm not sure structuring the Yampa "core" according to what is core functionality and what's not is all that useful. There are many cases where we want to implement combinators that fairly easily could be implemented in terms of others as primitives simply because we expect that that implementation is going to be much more efficient, and that the combinators are used sufficiently often to warrant doing this. E.g. switch should be a primitive, even though it could be derived from pSwitch.
• Reconsider recur. If an event source has an immediate occurrence, we'll get into a loop. For example: recur now. Maybe suppress initial occurrences? Initial occurrences are rather pointless in this case anyway.

Documentation

(^>>) :: Arrow a => (b -> c) -> a c d -> a b d infixr 1

Precomposition with a pure function.

(>>^) :: Arrow a => a b c -> (c -> d) -> a b d infixr 1

Postcomposition with a pure function.

(^<<) :: Arrow a => (c -> d) -> a b c -> a b d infixr 1

Postcomposition with a pure function (right-to-left variant).

(<<^) :: Arrow a => a c d -> (b -> c) -> a b d infixr 1

Precomposition with a pure function (right-to-left variant).

arr2 :: Arrow a => (b -> c -> d) -> a (b, c) d

arr3 :: Arrow a => (b -> c -> d -> e) -> a (b, c, d) e

arr4 :: Arrow a => (b -> c -> d -> e -> f) -> a (b, c, d, e) f

arr5 :: Arrow a => (b -> c -> d -> e -> f -> g) -> a (b, c, d, e, f) g

lift0 :: Arrow a => c -> a b c

lift1 :: Arrow a => (c -> d) -> a b c -> a b d

lift2 :: Arrow a => (c -> d -> e) -> a b c -> a b d -> a b e

lift3 :: Arrow a => (c -> d -> e -> f) -> a b c -> a b d -> a b e -> a b f

lift4 :: Arrow a => (c -> d -> e -> f -> g) -> a b c -> a b d -> a b e -> a b f -> a b g

lift5 :: Arrow a => (c -> d -> e -> f -> g -> h) -> a b c -> a b d -> a b e -> a b f -> a b g -> a b h

snap :: SF a (Event a)

snapAfter :: Time -> SF a (Event a)

sample :: Time -> SF a (Event a)

recur :: SF a (Event b) -> SF a (Event b)

andThen :: SF a (Event b) -> SF a (Event b) -> SF a (Event b) infixr 5

sampleWindow :: Int -> Time -> SF a (Event [a])

parZ :: [SF a b] -> SF [a] [b]

pSwitchZ :: [SF a b] -> SF ([a], [b]) (Event c) -> ([SF a b] -> c -> SF [a] [b]) -> SF [a] [b]

dpSwitchZ :: [SF a b] -> SF ([a], [b]) (Event c) -> ([SF a b] -> c -> SF [a] [b]) -> SF [a] [b]

rpSwitchZ :: [SF a b] -> SF ([a], Event ([SF a b] -> [SF a b])) [b]

drpSwitchZ :: [SF a b] -> SF ([a], Event ([SF a b] -> [SF a b])) [b]

provided :: (a -> Bool) -> SF a b -> SF a b -> SF a b

old_dHold :: a -> SF (Event a) a

dTrackAndHold :: a -> SF (Maybe a) a

old_accumHold :: a -> SF (Event (a -> a)) a

old_dAccumHold :: a -> SF (Event (a -> a)) a

old_accumHoldBy :: (b -> a -> b) -> b -> SF (Event a) b

old_dAccumHoldBy :: (b -> a -> b) -> b -> SF (Event a) b

count :: Integral b => SF (Event a) (Event b)

fby :: b -> SF a b -> SF a b infixr 0

impulseIntegral :: VectorSpace a k => SF (a, Event a) a

old_impulseIntegral :: VectorSpace a k => SF (a, Event a) a