blob: c90224a810d229870448c35c9e5687b777a16640 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
----------------------------------------------------------------------
-- |
-- Module : Comments
-- Maintainer : (Maintainer)
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/02/18 19:21:13 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.4 $
--
-- comment removal
-----------------------------------------------------------------------------
module Comments ( remComments
) where
-- | comment removal : line tails prefixed by -- as well as chunks in @{- ... -}@
remComments :: String -> String
remComments s =
case s of
'"':s2 -> '"':pass remComments s2 -- comment marks in quotes not removed!
'{':'-':cs -> readNested cs
'-':'-':cs -> readTail cs
c:cs -> c : remComments cs
[] -> []
where
readNested t =
case t of
'"':s2 -> '"':pass readNested s2
'-':'}':cs -> remComments cs
_:cs -> readNested cs
[] -> []
readTail t =
case t of
'\n':cs -> '\n':remComments cs
_:cs -> readTail cs
[] -> []
pass f t =
case t of
'"':s2 -> '"': f s2
c:s2 -> c:pass f s2
_ -> t
|
