Mercurial > hg > Members > atton > delta_monad

annotate delta.hs @ 45:0c2d758406b1 PairDelta

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Mini refactor
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Sun, 09 Nov 2014 12:04:20 +0900
parents 6e270dfe2bb9
children cb5c190aa45d
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279ebcf670c4 Define Similar as Applicative
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1 import Control.Applicative
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2 import Data.Numbers.Primes -- $ cabal install primes
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4 data Delta a = Delta [String] a [String] a
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6 instance (Show a) => Show (Delta a) where
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7 show (Delta lx x ly y) = values ++ logs
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8 where
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9 values = "Delta {" ++ (show x) ++ "|" ++ (show y) ++ "}\n"
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0c2d758406b1 Mini refactor
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10 logs = concat . reverse $ zipWith formatter lx ly
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11 formatter x y = " {" ++ x ++ (separator x y) ++ y ++ "}\n"
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12 separator x y = if (max (length x) (length y)) > 50 then "|\n " else "|"
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279ebcf670c4 Define Similar as Applicative
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90b171e3a73e Rename to Delta from Similar
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14 value :: (Delta a) -> a
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15 value (Delta _ x _ _) = x
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af8754322ed4 Define Similar sample
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17 similar :: (Delta a) -> a
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18 similar (Delta _ _ _ y) = y
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116131b196bb Define fmap and mu
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20 instance (Eq a) => Eq (Delta a) where
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003b6e58d815 Define Similar as Monad by mu
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21 s == ss = (value s) == (value ss)
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23 instance Functor Delta where
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24 fmap f (Delta xs x ys y) = Delta xs (f x) ys (f y)
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26 instance Applicative Delta where
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27 pure f = Delta [] f [] f
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28 (Delta lf f lg g) <*> (Delta lx x ly y) = Delta (lf ++ lx) (f x) (lg ++ ly) (g y)
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d4aa70d94352 Define Similar as Applicative
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30 mu :: Delta (Delta a) -> Delta a
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31 mu (Delta lx (Delta llx x _ _) ly (Delta _ _ lly y)) = Delta (lx ++ llx) x (ly ++ lly) y
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33 instance Monad Delta where
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34 return x = Delta [] x [] x
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35 s >>= f = mu $ fmap f s
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38 returnS :: (Show s) => s -> Delta s
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39 returnS x = Delta [(show x)] x [(show x)] x
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7a82a5e50499 Initial commit. define to Functor for Similer
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41 returnSS :: (Show s) => s -> s -> Delta s
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42 returnSS x y = Delta [(show x)] x [(show y)] y
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b4d3960af901 Define similar constructor for different element
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44 -- samples
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3c5fbce357af Define >>= for Similer
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46 generator :: Int -> Delta [Int]
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47 generator x = let intList = [1..x] in
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48 returnS intList
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50 primeFilter :: [Int] -> Delta [Int]
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51 primeFilter xs = let primeList = filter isPrime xs
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52 refactorList = filter even xs in
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53 returnSS primeList refactorList
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e8a5df54480e Define sample for Monad style
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55 count :: [Int] -> Delta Int
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56 count xs = let primeCount = length xs in
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57 returnS primeCount
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c599d2236d19 Similar as Monad
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59 primeCount :: Int -> Delta Int
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60 primeCount x = generator x >>= primeFilter >>= count