Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/PackedString/TakeWhile.hs

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Distributed under the MIT License.
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module NHC.PackedString where

import Prelude hiding(takeWhile,length,Ix(..),substr)
import DPackedString
import Length
import Index
import Substr

takeWhile :: (Char -> Bool) -> PackedString -> PackedString
takeWhile f p = tw 0 (length p)
	where tw :: Int -> Int -> PackedString
	      tw n l =
		if n < l then
		    if f (index p n) then tw (n+1) l else substr p 0 n
		else
		    p

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