Initial data commit

Task/Non-decimal-radices-Convert/Haskell/non-decimal-radices-convert-1.hs

@@ -0,0 +1,4 @@
+Prelude> Numeric.showIntAtBase 16 Char.intToDigit 42 ""
+"2a"
+Prelude> fst $ head $ Numeric.readInt 16 Char.isHexDigit Char.digitToInt "2a"
+42

Task/Non-decimal-radices-Convert/Haskell/non-decimal-radices-convert-2.hs

@@ -0,0 +1,21 @@
+import Data.List
+import Data.Char
+
+toBase :: Int -> Int -> [Int]
+toBase b v = toBase' [] v where
+  toBase' a 0 = a
+  toBase' a v = toBase' (r:a) q where (q,r) = v `divMod` b
+
+fromBase :: Int -> [Int] -> Int
+fromBase b ds = foldl' (\n k -> n * b + k) 0 ds
+
+toAlphaDigits :: [Int] -> String
+toAlphaDigits = map convert where
+  convert n | n < 10    = chr (n + ord '0')
+            | otherwise = chr (n + ord 'a' - 10)
+
+fromAlphaDigits :: String -> [Int]
+fromAlphaDigits = map convert where
+ convert c | isDigit c = ord c - ord '0'
+           | isUpper c = ord c - ord 'A' + 10
+           | isLower c = ord c - ord 'a' + 10

Task/Non-decimal-radices-Convert/Haskell/non-decimal-radices-convert-3.hs

@@ -0,0 +1,4 @@
+*Main> toAlphaDigits $ toBase 16 $ 42
+"2a"
+*Main> fromBase 16 $ fromAlphaDigits $ "2a"
+42

Task/Non-decimal-radices-Convert/Haskell/non-decimal-radices-convert-4.hs

@@ -0,0 +1,54 @@
+import Data.Bifunctor (first)
+import Data.List (unfoldr)
+import Data.Tuple (swap)
+import Data.Bool (bool)
+
+
+inBaseDigits :: String -> Int -> String
+inBaseDigits ds n =
+  let base = length ds
+  in reverse $
+     unfoldr
+       ((<*>)
+          (bool Nothing . Just . first (ds !!) . swap . flip quotRem base)
+          (0 <))
+       n
+
+
+inLowerHex :: Int -> String
+inLowerHex = inBaseDigits "0123456789abcdef"
+
+inUpperHex :: Int -> String
+inUpperHex = inBaseDigits "0123456789ABCDEF"
+
+inBinary :: Int -> String
+inBinary = inBaseDigits "01"
+
+inOctal :: Int -> String
+inOctal = inBaseDigits "01234567"
+
+inDevanagariDecimal :: Int -> String
+inDevanagariDecimal = inBaseDigits "०१२३४५६७८९"
+
+inHinduArabicDecimal :: Int -> String
+inHinduArabicDecimal = inBaseDigits "٠١٢٣٤٥٦٧٨٩"
+
+toBase :: Int -> Int -> String
+toBase intBase n
+  | (intBase < 36) && (intBase > 0) =
+    inBaseDigits (take intBase (['0' .. '9'] ++ ['a' .. 'z'])) n
+  | otherwise = []
+
+main :: IO ()
+main =
+  mapM_ putStrLn $
+  [ inLowerHex
+  , inUpperHex
+  , inBinary
+  , inOctal
+  , toBase 16
+  , toBase 2
+  , inDevanagariDecimal
+  , inHinduArabicDecimal
+  ] <*>
+  [254]