1st commit on 015_haskell

2 files changed, 45 insertions, 0 deletions

diff --git a/challenge-015/stuart-little/haskell/ch-1.hs b/challenge-015/stuart-little/haskell/ch-1.hs
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+++ b/challenge-015/stuart-little/haskell/ch-1.hs
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+#!/usr/bin/env runghc
+
+-- run <script>
+
+import Data.Numbers.Primes (primes,)
+import Data.List (transpose,)
+
+sprimes = map (\(x:y:z:_) -> y) $ filter (\(x:y:z:_)-> x+z < 2*y) $ transpose $ take 3 $ iterate tail primes
+
+wprimes = map (\(x:y:z:_) -> y) $ filter (\(x:y:z:_)-> x+z > 2*y) $ transpose $ take 3 $ iterate tail primes
+
+main = do
+  let n = 10
+  putStrLn ("Strong primes: " ++ (unwords $ map show $ take n sprimes))
+  putStrLn ("Weak primes: " ++ (unwords $ map show $ take n wprimes))
diff --git a/challenge-015/stuart-little/haskell/ch-2.hs b/challenge-015/stuart-little/haskell/ch-2.hs
new file mode 100755
index 0000000000..ecafca94c8
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+++ b/challenge-015/stuart-little/haskell/ch-2.hs
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+#!/usr/bin/env runghc
+
+-- run <script> <'-e' or '-d' flag tencode or decode respectively> <keyword> <quoted text>
+
+{-# LANGUAGE PackageImports #-}
+
+import Data.Char (toUpper,ord,chr,)
+import System.Environment (getArgs,)
+import "ghc" Util (nTimes,)
+
+alph :: String
+alph = ['A'..'Z']
+
+baseOffset :: Int
+baseOffset = ord 'A'
+
+norm :: String -> String
+norm = (filter (flip elem alph)) . (map toUpper)
+
+vigEncode :: String -> String -> String
+vigEncode key input = map (\(o,c) -> chr $ baseOffset + (mod (ord c -baseOffset +o) (length alph))) $ zip offsets $ norm input where
+  offsets = map ((flip (-) baseOffset) . ord) $ cycle $ norm key
+
+vigDecode :: String -> String -> String
+vigDecode key = nTimes (length alph -1) (vigEncode key)
+
+main = do
+  (flag:key:txt:_) <- getArgs
+  let process = if flag == "-d" then vigDecode else vigEncode
+  putStrLn $ process key txt