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Model the state in Myers’ algorithm.

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Rob Rix 2017-03-09 10:30:42 -05:00
parent 384e016262
commit a400c8f2af
1 changed files with 7 additions and 1 deletions
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src/SES/Myers.hs
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@ -11,7 +11,13 @@ data MyersF a where
MiddleSnake :: Vector.Vector a -> Vector.Vector a -> MyersF (Snake, EditDistance)
FindDPath :: Direction -> EditDistance -> Diagonal -> MyersF Endpoint
type Myers = Freer MyersF
data StepF a where
M :: MyersF a -> StepF a
S :: State (MyersState a) a -> StepF a
data MyersState a = MyersState { forward :: !(Vector.Vector a), backward :: !(Vector.Vector a) }
type Myers = Freer StepF
data Snake = Snake { xy :: Endpoint, uv :: Endpoint }