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Define our own State type.

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This commit is contained in:
Rob Rix 2017-03-09 14:21:59 -05:00
parent 69a1199268
commit b81959ac72
1 changed files with 7 additions and 3 deletions
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10
src/SES/Myers.hs
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@ -4,13 +4,17 @@ module SES.Myers where
import Control.Monad.Free.Freer
import Data.These
import qualified Data.Vector as Vector
import Prologue hiding (for)
import Prologue hiding (for, State)
data MyersF a where
SES :: [a] -> [a] -> MyersF [These a a]
MiddleSnake :: Vector.Vector a -> Vector.Vector a -> MyersF (Snake, EditDistance)
FindDPath :: Direction -> EditDistance -> Diagonal -> MyersF Endpoint
data State s a where
Get :: State s s
Put :: s -> State s ()
data For a where
For :: [a] -> For a
Continue :: For a
@ -98,5 +102,5 @@ inInterval k (lower, upper) = k >= lower && k <= upper
-- Instances
instance MonadState MyersState Myers where
get = S get `Then` return
put a = S (put a) `Then` return
get = S Get `Then` return
put a = S (Put a) `Then` return