[project @ 2004-03-27 14:15:24 by panne]

[ghc-base.git] / Numeric.hs

diff --git a/Numeric.hs b/Numeric.hs
index 5603ae6..bde290d 100644 (file)
--- a/Numeric.hs
+++ b/Numeric.hs
@@ -30,7 +30,6 @@ module Numeric (
         showIntAtBase,    -- :: Integral a => a -> (a -> Char) -> a -> ShowS
         showHex,          -- :: Integral a => a -> ShowS
         showOct,          -- :: Integral a => a -> ShowS
-        showBin,          -- :: Integral a => a -> ShowS
 
        showEFloat,       -- :: (RealFloat a) => Maybe Int -> a -> ShowS
        showFFloat,       -- :: (RealFloat a) => Maybe Int -> a -> ShowS
@@ -142,36 +141,20 @@ showGFloat d x =  showString (formatRealFloat FFGeneric d x)
 -- ---------------------------------------------------------------------------
 -- Integer printing functions
 
-showIntAtBase :: Integral a => a -> (a -> Char) -> a -> ShowS
+showIntAtBase :: Integral a => a -> (Int -> Char) -> a -> ShowS
 showIntAtBase base toChr n r
-  | n < 0  = error ("Numeric.showIntAtBase: applied to negative number " ++ show n)
-  | otherwise = 
-    case quotRem n base of { (n', d) ->
-    let c = toChr d in
-    seq c $ -- stricter than necessary
-    let
-       r' = c : r
-    in
-    if n' == 0 then r' else showIntAtBase base toChr n' r'
-    }
-
-showHex :: Integral a => a -> ShowS
-showHex n r = 
- showString "0x" $
- showIntAtBase 16 (toChrHex) n r
- where  
-  toChrHex d
-    | d < 10    = chr (ord '0' + fromIntegral d)
-    | otherwise = chr (ord 'a' + fromIntegral (d - 10))
-
-showOct :: Integral a => a -> ShowS
-showOct n r = 
- showString "0o" $
- showIntAtBase 8 (toChrOct) n r
- where toChrOct d = chr (ord '0' + fromIntegral d)
-
-showBin :: Integral a => a -> ShowS
-showBin n r = 
- showString "0b" $
- showIntAtBase 2 (toChrOct) n r
- where toChrOct d = chr (ord '0' + fromIntegral d)
+  | 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
+
+showHex, showOct :: Integral a => a -> ShowS
+showHex = showIntAtBase 16 intToDigit
+showOct = showIntAtBase 8  intToDigit