/usr/lib/hugs/packages/base/Numeric.hs is in libhugs-base-bundled 98.200609.21-5.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-----------------------------------------------------------------------------
-- |
-- Module : Numeric
-- Copyright : (c) The University of Glasgow 2002
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : portable
--
-- Odds and ends, mostly functions for reading and showing
-- 'RealFloat'-like kind of values.
--
-----------------------------------------------------------------------------
module Numeric (
-- * Showing
showSigned, -- :: (Real a) => (a -> ShowS) -> Int -> a -> ShowS
showIntAtBase, -- :: Integral a => a -> (a -> Char) -> a -> ShowS
showInt, -- :: Integral a => a -> ShowS
showHex, -- :: Integral a => a -> ShowS
showOct, -- :: Integral a => a -> ShowS
showEFloat, -- :: (RealFloat a) => Maybe Int -> a -> ShowS
showFFloat, -- :: (RealFloat a) => Maybe Int -> a -> ShowS
showGFloat, -- :: (RealFloat a) => Maybe Int -> a -> ShowS
showFloat, -- :: (RealFloat a) => a -> ShowS
floatToDigits, -- :: (RealFloat a) => Integer -> a -> ([Int], Int)
-- * Reading
-- | /NB:/ 'readInt' is the \'dual\' of 'showIntAtBase',
-- and 'readDec' is the \`dual\' of 'showInt'.
-- The inconsistent naming is a historical accident.
readSigned, -- :: (Real a) => ReadS a -> ReadS a
readInt, -- :: (Integral a) => a -> (Char -> Bool)
-- -> (Char -> Int) -> ReadS a
readDec, -- :: (Integral a) => ReadS a
readOct, -- :: (Integral a) => ReadS a
readHex, -- :: (Integral a) => ReadS a
readFloat, -- :: (RealFloat a) => ReadS a
lexDigits, -- :: ReadS String
-- * Miscellaneous
fromRat, -- :: (RealFloat a) => Rational -> a
) where
import Data.Char
import Hugs.Prelude
import Hugs.Numeric
-- ---------------------------------------------------------------------------
-- Integer printing functions
-- | Shows a /non-negative/ 'Integral' number using the base specified by the
-- first argument, and the character representation specified by the second.
showIntAtBase :: Integral a => a -> (Int -> Char) -> a -> ShowS
showIntAtBase base toChr n r
| base <= 1 = error ("Numeric.showIntAtBase: applied to unsupported base " ++ show base)
| n < 0 = error ("Numeric.showIntAtBase: applied to negative number " ++ show n)
| otherwise = showIt (quotRem n base) r
where
showIt (n,d) r = seq c $ -- stricter than necessary
case n of
0 -> r'
_ -> showIt (quotRem n base) r'
where
c = toChr (fromIntegral d)
r' = c : r
-- | Show /non-negative/ 'Integral' numbers in base 16.
showHex :: Integral a => a -> ShowS
showHex = showIntAtBase 16 intToDigit
-- | Show /non-negative/ 'Integral' numbers in base 8.
showOct :: Integral a => a -> ShowS
showOct = showIntAtBase 8 intToDigit
|