34 lines
824 B
Haskell
34 lines
824 B
Haskell
{-# LANGUAGE NamedFieldPuns #-}
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module Medicine (
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Medicine(..)
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, MedicineName
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, Pharmacy
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, pharmacy
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) where
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import CSV (Row(..))
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import Data.Map (Map)
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import qualified Data.Map as Map (empty, insert, lookup)
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import Text.ParserCombinators.Parsec.Error (Message(..))
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type MedicineName = String
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data Medicine = Medicine {
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name :: MedicineName
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, content :: Float
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, minStock :: Float
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} deriving (Show)
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instance Row Medicine where
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fromRow assoc = Medicine <$>
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get "name"
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<*> (read <$> get "content")
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<*> (read <$> get "minStock")
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where
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get key = maybe (Left $ Expect key) Right $ Map.lookup key assoc
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type Pharmacy = Map MedicineName Medicine
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pharmacy :: [Medicine] -> Pharmacy
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pharmacy = foldr (\medicine -> Map.insert (name medicine) medicine) Map.empty
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