Files
advent-of-code-2023/day02/Commons.hs

41 lines
1.7 KiB
Haskell

module Commons where
import Data.String.Utils
import System.IO
import Text.Read
data Round = Round { red :: Int, green :: Int, blue :: Int }
data Game = Game { gid :: Int, rounds :: [Round] }
parseCubes :: [String] -> Round -> Round
parseCubes [] round = round
parseCubes ([h, ' ', 'r', 'e', 'd']: t) round = parseCubes t round {red = read [h]}
parseCubes ([h1, h2, ' ', 'r', 'e', 'd']: t) round = parseCubes t round {red = read [h1, h2]}
parseCubes ([h, ' ', 'g', 'r', 'e', 'e', 'n']: t) round = parseCubes t round {green = read [h]}
parseCubes ([h1, h2, ' ', 'g', 'r', 'e', 'e', 'n']: t) round = parseCubes t round {green = read [h1, h2]}
parseCubes ([h, ' ', 'b', 'l', 'u', 'e']: t) round = parseCubes t round {blue = read [h]}
parseCubes ([h1, h2, ' ', 'b', 'l', 'u', 'e']: t) round = parseCubes t round {blue = read [h1, h2]}
parseRound :: String -> Round
parseRound roundRaw = parseCubes (split ", " roundRaw) Round {red = 0, green = 0, blue = 0}
parseRounds :: String -> [Round]
parseRounds roundsRaw = map parseRound (split "; " roundsRaw)
parseGame :: String -> Game
parseGame ('G': 'a': 'm': 'e': ' ': h: ':': ' ': t) = Game {gid = read [h], rounds = parseRounds t}
parseGame ('G': 'a': 'm': 'e': ' ': h1: h2: ':': ' ': t) = Game {gid = read [h1, h2], rounds = parseRounds t}
parseGame ('G': 'a': 'm': 'e': ' ': h1: h2: h3: ':': ' ': t) = Game {gid = read [h1, h2, h3], rounds = parseRounds t}
parseGame (_: t) = parseGame t
parse :: IO [Game]
parse = do done <- isEOF
if done
then return []
else do line <- getLine
let game = parseGame line
otherGames <- parse
return (game: otherGames)