[project @ 2005-02-01 00:52:20 by ross]

[ghc-base.git] / Data / PackedString.hs

diff --git a/Data/PackedString.hs b/Data/PackedString.hs
index 0db102a..46fb4ba 100644 (file)
--- a/Data/PackedString.hs
+++ b/Data/PackedString.hs
@@ -83,6 +83,11 @@ import System.IO
 -- efficient operations.  A 'PackedString' contains full Unicode 'Char's.
 newtype PackedString = PS (UArray Int Char)
 
+-- ToDo: we could support "slices", i.e. include offset and length fields into
+-- the string, so that operations like take/drop could be O(1).  Perhaps making
+-- a slice should be conditional on the ratio of the slice/string size to
+-- limit memory leaks.
+
 instance Eq PackedString where
    (PS x) == (PS y)  =  x == y
 
@@ -261,7 +266,7 @@ joinPS filler pss = concatPS (splice pss)
   * joinPS (packString [x]) (splitPS x ls) = ls
 -}
 
--- | The 'splitPS' function splits the input string on each occurance of the given 'Char'.
+-- | The 'splitPS' function splits the input string on each occurrence of the given 'Char'.
 splitPS :: Char -> PackedString -> [PackedString]
 splitPS c = splitWithPS (== c)
 
@@ -309,7 +314,7 @@ substrPS (PS ps) begin end = packString [ ps ! i | i <- [begin..end] ]
 -- | Outputs a 'PackedString' to the specified 'Handle'.
 --
 -- NOTE: the representation of the 'PackedString' in the file is assumed to
--- be in the ISO-8859-1 encoding.  In other words, only the least signficant
+-- be in the ISO-8859-1 encoding.  In other words, only the least significant
 -- byte is taken from each character in the 'PackedString'.
 hPutPS :: Handle -> PackedString -> IO ()
 hPutPS h (PS ps) = do