ghc-exactprint-0.2: tests/examples/Utilities.hs

module Utilities (toBinary, fl) where

import Stream
import Data.Ratio

-- Convert from an Integer to its signed-digit representation
toBinary :: Integer -> Stream
toBinary 0 = [0]
toBinary x = toBinary t ++ [x `mod` 2]
             where t = x `div` 2



fl :: Stream -> Stream
fl (x:xs) = (f x):xs
          where f 0 = 1
                f 1 = 0