module BishBosh.Notation.Coordinate(
Coordinate(
getMove
),
origin,
regexSyntax,
showsCoordinates,
mkCoordinate,
mkCoordinate'
) where
import Control.Arrow((&&&))
import qualified BishBosh.Attribute.Rank as Attribute.Rank
import qualified BishBosh.Cartesian.Abscissa as Cartesian.Abscissa
import qualified BishBosh.Cartesian.Coordinates as Cartesian.Coordinates
import qualified BishBosh.Cartesian.Ordinate as Cartesian.Ordinate
import qualified BishBosh.Component.Move as Component.Move
import qualified BishBosh.Data.Exception as Data.Exception
import qualified Control.Arrow
import qualified Control.Exception
import qualified Data.Char
import qualified Data.List.Extra
import qualified Data.Maybe
xOrigin :: Int
xOrigin = Data.Char.ord 'a'
yOrigin :: Int
yOrigin = Data.Char.ord '1'
origin :: (Int, Int)
origin = (xOrigin, yOrigin)
regexSyntax :: String
regexSyntax = showString "([a-h][1-8]){2}[" $ showString (
concatMap show Attribute.Rank.promotionProspects
) "]?"
data Coordinate x y = MkCoordinate {
getMove :: Component.Move.Move x y,
getMaybePromotionRank :: Maybe Attribute.Rank.Rank
} deriving Eq
mkCoordinate :: Component.Move.Move x y -> Maybe Attribute.Rank.Rank -> Coordinate x y
mkCoordinate move maybePromotionRank
| Just rank <- maybePromotionRank
, rank `notElem` Attribute.Rank.promotionProspects = Control.Exception.throw . Data.Exception.mkInvalidDatum . showString "BishBosh.Notation.Coordinate.Coordinate:\tcan't promote to a " $ shows rank "."
| otherwise = MkCoordinate {
getMove = move,
getMaybePromotionRank = maybePromotionRank
}
mkCoordinate' :: Attribute.Rank.Promotable promotable => Component.Move.Move x y -> promotable -> Coordinate x y
mkCoordinate' move = mkCoordinate move . Attribute.Rank.getMaybePromotionRank
encode :: (Enum x, Enum y) => Cartesian.Coordinates.Coordinates x y -> (ShowS, ShowS)
encode = showChar . Data.Char.chr . (+ (xOrigin - Cartesian.Abscissa.xOrigin)) . fromEnum . Cartesian.Coordinates.getX &&& showChar . Data.Char.chr . (+ (yOrigin - Cartesian.Ordinate.yOrigin)) . fromEnum . Cartesian.Coordinates.getY
showsCoordinates :: (Enum x, Enum y) => Cartesian.Coordinates.Coordinates x y -> ShowS
showsCoordinates = uncurry (.) . encode
instance (Enum x, Enum y) => Show (Coordinate x y) where
showsPrec _ MkCoordinate {
getMove = move,
getMaybePromotionRank = maybePromotionRank
} = showsCoordinates (
Component.Move.getSource move
) . showsCoordinates (
Component.Move.getDestination move
) . Data.Maybe.maybe id shows maybePromotionRank
instance (
Enum x,
Enum y,
Ord x,
Ord y
) => Read (Coordinate x y) where
readsPrec _ s = case Data.List.Extra.trimStart s of
x : y : x' : y' : remainder -> let
translate x'' y'' = Cartesian.Coordinates.mkMaybeCoordinates (
toEnum $ Data.Char.ord x'' + (Cartesian.Abscissa.xOrigin - xOrigin)
) (
toEnum $ Data.Char.ord y'' + (Cartesian.Ordinate.yOrigin - yOrigin)
)
in [
Control.Arrow.first (
mkCoordinate $ Component.Move.mkMove source destination
) (
case reads $ take 1 remainder of
[(rank, "")] -> if rank `elem` Attribute.Rank.promotionProspects
then (Just rank, tail remainder)
else (Nothing, remainder)
_ -> (Nothing, remainder)
) |
source <- Data.Maybe.maybeToList $ translate x y,
destination <- Data.Maybe.maybeToList $ translate x' y',
source /= destination
]
_ -> []
instance Attribute.Rank.Promotable (Coordinate x y) where
getMaybePromotionRank = getMaybePromotionRank