58 lines
1.7 KiB
Haskell
58 lines
1.7 KiB
Haskell
{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE DeriveAnyClass #-}
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{-# LANGUAGE DeriveGeneric #-}
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--------------------------------------------------------------------------------
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module Keyboard where
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--------------------------------------------------------------------------------
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import Utils
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import Data.Coerce
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import Data.Hashable (Hashable)
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import GHC.Generics (Generic)
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import qualified Data.List as List
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import qualified Data.HashMap.Strict as HM
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--------------------------------------------------------------------------------
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newtype Keyboard = Keyboard [[Char]]
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deriving (Eq)
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instance Show Keyboard where
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show (Keyboard xxs) =
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xxs |> fmap printRow |> List.intercalate "\n"
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where
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printRow :: [Char] -> String
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printRow xs =
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xs |> fmap (\x -> '[':x:']':"") |> List.intercalate ""
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data Coord = Coord
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{ row :: Int
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, col :: Int
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} deriving (Eq, Show, Generic)
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instance Hashable Coord
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-- | List of characters to their QWERTY coordinatees.
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coords :: [(Char, Coord)]
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coords =
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qwerty
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|> coerce
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|> fmap (zip [0..])
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|> zip [0..]
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|> fmap (\(row, xs) -> xs |> fmap (\(col, char) -> (char, Coord row col)))
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|> mconcat
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-- | Mapping of characters to their coordinates on a QWERTY keyboard with the
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-- top-left corner as 0,0.
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charToCoord :: HM.HashMap Char Coord
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charToCoord = HM.fromList coords
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coordToChar :: Keyboard -> Coord -> Maybe Char
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coordToChar (Keyboard xxs) Coord{..} =
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Just $ xxs !! row !! col
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qwerty :: Keyboard
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qwerty = Keyboard [ ['1','2','3','4','5','6','7','8','9','0']
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, ['Q','W','E','R','T','Y','U','I','O','P']
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, ['A','S','D','F','G','H','J','K','L',';']
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, ['Z','X','C','V','B','N','M',',','.','/']
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]
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