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Monthly Downloads: 18
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags:
Data
Latest version: v0.3.0.4
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README
polyvariadic
Creation and application of polyvariadic functions
For example, the classic printf:
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FlexibleContexts #-}
import Data.Function.Polyvariadic
import Data.Accumulator
magicChar = '%'
notMagicChar = (/= magicChar)
data PrintfAccum = PrintfAccum { done :: String, todo :: String }
instance Show x => Accumulator PrintfAccum x where
accumulate x (PrintfAccum done (_:todo)) = PrintfAccum
(done ++ show x ++ takeWhile notMagicChar todo)
(dropWhile notMagicChar todo)
accumulate _ acc = acc
printf' str = polyvariadic
(PrintfAccum (takeWhile notMagicChar str) (dropWhile notMagicChar str))
done
>>> printf' "aaa%bbb%ccc%ddd" "TEST" 123 True
"aaa\"TEST\"bbb123cccTrueddd"