46 lines
1.3 KiB
Haskell
46 lines
1.3 KiB
Haskell
module Handler.Utils.Form.MassInput.Liveliness
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( BoxDimension(..)
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, IsBoxCoord(..)
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, boxDimension
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, Liveliness(..)
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) where
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import ClassyPrelude
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import Web.PathPieces (PathPiece)
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import Data.Aeson (ToJSON, FromJSON, ToJSONKey, FromJSONKey)
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import Numeric.Natural
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import Utils.Lens
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import Algebra.Lattice
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import qualified Data.Set as Set
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import Data.List (genericLength, genericIndex)
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data BoxDimension x = forall n. (Enum n, Eq n) => BoxDimension (Lens' x n)
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class (ToJSON x, FromJSON x, ToJSONKey x, FromJSONKey x, PathPiece x, Eq x, Ord x) => IsBoxCoord x where
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boxDimensions :: [BoxDimension x]
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boxOrigin :: x
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boxDimension :: IsBoxCoord x => Natural -> BoxDimension x
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boxDimension n
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| n < genericLength dims = genericIndex dims n
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| otherwise = error "boxDimension: insufficient dimensions"
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where
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dims = boxDimensions
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-- zeroDimension :: IsBoxCoord x => Natural -> x -> x
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-- zeroDimension (boxDimension -> BoxDimension dim) = set dim $ boxOrigin ^. dim
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class (IsBoxCoord (BoxCoord a), Lattice a, BoundedJoinSemiLattice a) => Liveliness a where
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type BoxCoord a :: *
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liveCoords :: Prism' (Set (BoxCoord a)) a
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liveCoord :: BoxCoord a -> Prism' Bool a
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liveCoord bC = prism' (\l -> bC `Set.member` review liveCoords l) (bool (Just bottom) (preview liveCoords $ Set.singleton bC))
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