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module Main where
import Data.Char
import Data.Foldable
import Numeric
header :: String
header = "Code C P S U L A D"
predicates :: [Char -> Bool]
predicates = [
isControl,
isPrint,
isSpace,
isUpper,
isLower,
isAlpha,
isDigit]
showBool :: Bool -> String
showBool True = " T"
showBool False = " F"
-- [NOTE] The original justification for this value is unknown
-- (commit 98f34fe900bc9fe1b86e2c01345c00bf579fd0eb from 2005).
-- It is probably a typo and is meant to be “65533” (0xfffd).
maxChar :: Char
maxChar = '\6553'
padding :: Int
padding = length (show (ord maxChar))
showCode :: Char -> String
showCode c = take padding (shows (ord c) (repeat ' '))
charEntry :: Char -> String
charEntry c = showCode c <> foldMap (showBool . ($ c)) predicates
main :: IO ()
main = do
putStrLn header
traverse_ (putStrLn . charEntry) [ minBound .. maxChar ]
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