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ScrambleParser.hs
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ScrambleParser.hs
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module ScrambleParser where
import Text.Parsec
import Rubik
direction :: Parsec String st Direction
direction = readDir <$> oneOf (concatMap show directions)
-- TODO: add number of rotations to the tuple
turn :: Parsec String st (Permutation, Direction, Rotation)
turn = do
dir <- direction
rotation <- option Clockwise (char '\'' >> return CounterClockwise)
n <- option 1 (char '2' >> return 2)
return (mconcat $ replicate n $ Permutation $ turnCube dir rotation, dir, rotation)
-- TODO: add number of rotations to the tuple
permutationList :: Parsec String st [(Permutation, Direction, Rotation)]
permutationList = turn `sepBy` space
parseTurn :: String -> (Permutation, Direction, Rotation)
parseTurn s = case parse turn "" s of
Right t -> t
Left _ -> error "could not parse turn"
parsePermutations :: String -> Permutation
parsePermutations s = case parse permutationList "" s of
Right ps -> case unzip3 ps of
(ps, _, _) -> mconcat ps
Left _ -> error "could not parse permutations"