| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Agda.Utils.Lens
Description
A cut-down implementation of lenses, with names taken from Edward Kmett's lens package.
Synopsis
- type LensMap i o = (i -> i) -> o -> o
- type LensSet i o = i -> o -> o
- type LensGet i o = o -> i
- type Lens' i o = forall f. Functor f => (i -> f i) -> o -> f o
- lFst :: Lens' a (a, b)
- lSnd :: Lens' b (a, b)
- (^.) :: o -> Lens' i o -> i
- set :: Lens' i o -> LensSet i o
- over :: Lens' i o -> LensMap i o
- focus :: Monad m => Lens' i o -> StateT i m a -> StateT o m a
- use :: MonadState o m => Lens' i o -> m i
- (.=) :: MonadState o m => Lens' i o -> i -> m ()
- (%=) :: MonadState o m => Lens' i o -> (i -> i) -> m ()
- (%==) :: MonadState o m => Lens' i o -> (i -> m i) -> m ()
- (%%=) :: MonadState o m => Lens' i o -> (i -> m (i, r)) -> m r
- locallyState :: MonadState o m => Lens' i o -> (i -> i) -> m r -> m r
- view :: MonadReader o m => Lens' i o -> m i
- locally :: MonadReader o m => Lens' i o -> (i -> i) -> m a -> m a
- locally' :: ((o -> o) -> m a -> m a) -> Lens' i o -> (i -> i) -> m a -> m a
- key :: Ord k => k -> Lens' (Maybe v) (Map k v)
- (<&>) :: Functor m => m a -> (a -> b) -> m b
Documentation
type Lens' i o = forall f. Functor f => (i -> f i) -> o -> f o Source #
Van Laarhoven style homogeneous lenses. Mnemoic: "Lens inner outer".
(^.) :: o -> Lens' i o -> i infixl 8 Source #
Get inner part i of structure o as designated by Lens' i o.
over :: Lens' i o -> LensMap i o Source #
Modify inner part i of structure o using a function i -> i.
focus :: Monad m => Lens' i o -> StateT i m a -> StateT o m a Source #
Focus on a part of the state for a stateful computation.
use :: MonadState o m => Lens' i o -> m i Source #
Read a part of the state.
(.=) :: MonadState o m => Lens' i o -> i -> m () infix 4 Source #
Write a part of the state.
(%=) :: MonadState o m => Lens' i o -> (i -> i) -> m () infix 4 Source #
Modify a part of the state.
(%==) :: MonadState o m => Lens' i o -> (i -> m i) -> m () infix 4 Source #
Modify a part of the state monadically.
(%%=) :: MonadState o m => Lens' i o -> (i -> m (i, r)) -> m r infix 4 Source #
Modify a part of the state monadically, and return some result.
locallyState :: MonadState o m => Lens' i o -> (i -> i) -> m r -> m r Source #
Modify a part of the state locally.
view :: MonadReader o m => Lens' i o -> m i Source #
Ask for part of read-only state.
locally :: MonadReader o m => Lens' i o -> (i -> i) -> m a -> m a Source #
Modify a part of the state in a subcomputation.