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Add an operation for getting the endpoint along diagonal k.

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This commit is contained in:
Rob Rix 2017-03-14 13:54:32 -04:00
parent 85a1dc0106
commit 69ee63b692
1 changed files with 19 additions and 5 deletions
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24
src/SES/Myers.hs
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@ -19,6 +19,8 @@ data MyersF element result where
SearchAlongK :: EditGraph a -> Distance -> Direction -> Diagonal -> MyersF a (Maybe (Snake, Distance))
FindDPath :: EditGraph a -> Distance -> Direction -> Diagonal -> MyersF a Endpoint
GetK :: EditGraph a -> Direction -> Diagonal -> MyersF a Int
data State s a where
Get :: State s s
Put :: s -> State s ()
@ -127,11 +129,11 @@ decompose myers = let ?callStack = popCallStack callStack in case myers of
else
continue
FindDPath _ (Distance d) direction (Diagonal k) -> do
FindDPath graph (Distance d) direction (Diagonal k) -> do
v <- gets (stateFor direction)
eq <- getEq
let prev = v ! offsetFor direction + pred k
let next = v ! offsetFor direction + succ k
prev <- getK graph direction (Diagonal (pred k))
next <- getK graph direction (Diagonal (succ k))
let x = if k == negate d || k /= d && prev < next
then next
else succ prev
@ -139,6 +141,10 @@ decompose myers = let ?callStack = popCallStack callStack in case myers of
setStateFor direction (v Vector.// [(offsetFor direction + k, x')])
return (Endpoint x' y')
GetK _ direction (Diagonal k) -> do
v <- gets (stateFor direction)
return (v ! offsetFor direction + k)
where (!) = (Vector.!)
EditGraph as bs = editGraph myers
n = length as
@ -214,6 +220,9 @@ searchAlongK graph d direction k = M (SearchAlongK graph d direction k) `Then` r
findDPath :: HasCallStack => EditGraph a -> Distance -> Direction -> Diagonal -> Myers a Endpoint
findDPath graph d direction k = M (FindDPath graph d direction k) `Then` return
getK :: HasCallStack => EditGraph a -> Direction -> Diagonal -> Myers a Int
getK graph direction diagonal = M (GetK graph direction diagonal) `Then` return
getEq :: HasCallStack => Myers a (a -> a -> Bool)
getEq = GetEq `Then` return
@ -267,6 +276,7 @@ editGraph myers = case myers of
SearchUpToD g _ -> g
SearchAlongK g _ _ _ -> g
FindDPath g _ _ _ -> g
GetK g _ _ -> g
liftShowsVector :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Vector.Vector a -> ShowS
@ -301,8 +311,12 @@ instance Show2 MyersF where
MiddleSnake graph -> showsUnaryWith (liftShowsPrec sp1 sl1) "MiddleSnake" d graph
SearchUpToD graph distance -> showsBinaryWith (liftShowsPrec sp1 sl1) showsPrec "SearchUpToD" d graph distance
SearchAlongK graph distance direction diagonal -> showsQuaternaryWith (liftShowsPrec sp1 sl1) showsPrec showsPrec showsPrec "SearchAlongK" d graph direction distance diagonal
FindDPath graph distance direction diagonal -> showsQuaternaryWith (liftShowsPrec sp1 sl1) showsPrec showsPrec showsPrec "FindDPath" d graph direction distance diagonal
where showsQuaternaryWith :: (Int -> a -> ShowS) -> (Int -> b -> ShowS) -> (Int -> c -> ShowS) -> (Int -> d -> ShowS) -> String -> Int -> a -> b -> c -> d -> ShowS
FindDPath graph distance direction diagonal -> showsQuaternaryWith (liftShowsPrec sp1 sl1) showsPrec showsPrec showsPrec "FindDPath" d graph distance direction diagonal
GetK graph direction diagonal -> showsTernaryWith (liftShowsPrec sp1 sl1) showsPrec showsPrec "GetK" d graph direction diagonal
where showsTernaryWith :: (Int -> a -> ShowS) -> (Int -> b -> ShowS) -> (Int -> c -> ShowS) -> String -> Int -> a -> b -> c -> ShowS
showsTernaryWith sp1 sp2 sp3 name d x y z = showParen (d > 10) $
showString name . showChar ' ' . sp1 11 x . showChar ' ' . sp2 11 y . showChar ' ' . sp3 11 z
showsQuaternaryWith :: (Int -> a -> ShowS) -> (Int -> b -> ShowS) -> (Int -> c -> ShowS) -> (Int -> d -> ShowS) -> String -> Int -> a -> b -> c -> d -> ShowS
showsQuaternaryWith sp1 sp2 sp3 sp4 name d x y z w = showParen (d > 10) $
showString name . showChar ' ' . sp1 11 x . showChar ' ' . sp2 11 y . showChar ' ' . sp3 11 z . showChar ' ' . sp4 11 w