Mercurial > hg > Members > atton > delta_monad
annotate delta.hs @ 46:cb5c190aa45d
Define bubble sort
author | Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp> |
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date | Tue, 11 Nov 2014 13:28:55 +0900 |
parents | 0c2d758406b1 |
children | 1aefea69f71b |
rev | line source |
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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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3 |
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Define pretty-print for Delta
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4 data Delta a = Delta [String] a [String] a |
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5 |
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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" |
45 | 10 logs = concat . reverse $ zipWith formatter lx ly |
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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14 value :: (Delta a) -> a |
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15 value (Delta _ x _ _) = x |
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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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Define fmap and mu
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19 |
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20 instance (Eq a) => Eq (Delta a) where |
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Define Similar as Monad by mu
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21 s == ss = (value s) == (value ss) |
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22 |
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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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25 |
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26 -- not proof |
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27 fmapS :: (Show a) => (a -> b) -> Delta a -> Delta b |
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28 fmapS f (Delta lx x ly y) = Delta (lx ++ [(show x)]) (f x) (ly ++ [(show y)]) (f y) |
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29 |
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30 instance Applicative Delta where |
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31 pure f = Delta [] f [] f |
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32 (Delta lf f lg g) <*> (Delta lx x ly y) = Delta (lf ++ lx) (f x) (lg ++ ly) (g y) |
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33 |
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34 mu :: Delta (Delta a) -> Delta a |
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35 mu (Delta lx (Delta llx x _ _) ly (Delta _ _ lly y)) = Delta (lx ++ llx) x (ly ++ lly) y |
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36 |
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37 instance Monad Delta where |
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38 return x = Delta [] x [] x |
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39 s >>= f = mu $ fmap f s |
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40 |
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41 |
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42 returnS :: (Show s) => s -> Delta s |
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43 returnS x = Delta [(show x)] x [(show x)] x |
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Initial commit. define to Functor for Similer
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45 returnSS :: (Show s) => s -> s -> Delta s |
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46 returnSS x y = Delta [(show x)] x [(show y)] y |
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47 |
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48 -- samples |
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Define >>= for Similer
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49 |
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50 generator :: Int -> Delta [Int] |
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51 generator x = let intList = [1..x] in |
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52 returnS intList |
6 | 53 |
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54 primeFilter :: [Int] -> Delta [Int] |
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55 primeFilter xs = let primeList = filter isPrime xs |
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56 refactorList = filter even xs in |
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57 returnSS primeList refactorList |
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58 |
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59 count :: [Int] -> Delta Int |
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60 count xs = let primeCount = length xs in |
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61 returnS primeCount |
15 | 62 |
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63 primeCount :: Int -> Delta Int |
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64 primeCount x = generator x >>= primeFilter >>= count |
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65 |
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66 bubbleSort :: [Int] -> Delta [Int] |
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67 bubbleSort [] = returnS [] |
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68 bubbleSort xs = fmapS (\x -> (replicate maxNumCount maxNum) ++ x) (bubbleSort remainList) |
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69 where |
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70 maxNum = maximum xs |
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71 remainList = filter (/= maxNum) xs |
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72 maxNumCount = (length xs) - (length remainList) |
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73 |