1 -----------------------------------------------------------------------------
2 -- $Id: DriverUtil.hs,v 1.37 2003/03/04 11:12:11 simonmar Exp $
4 -- Utils for the driver
6 -- (c) The University of Glasgow 2000
8 -----------------------------------------------------------------------------
10 module DriverUtil where
12 #include "../includes/config.h"
13 #include "HsVersions.h"
17 import Config ( cLeadingUnderscore )
19 import EXCEPTION ( Exception(..), finally, throwDyn, catchDyn, throw )
20 import qualified EXCEPTION as Exception
22 import DATA_IOREF ( IORef, readIORef, writeIORef )
24 import Directory ( getDirectoryContents, doesDirectoryExist )
30 -----------------------------------------------------------------------------
31 -- Reading OPTIONS pragmas
34 :: String -- input file
35 -> IO [String] -- options, if any
36 getOptionsFromSource file
37 = do h <- openFile file ReadMode
38 catchJust ioErrors (look h `finally` hClose h)
39 (\e -> if isEOFError e then return [] else ioError e)
43 let l = remove_spaces l'
46 | prefixMatch "#" l -> look h
47 | prefixMatch "{-# LINE" l -> look h -- -}
48 | Just opts <- matchOptions l
50 return (words opts ++ rest)
51 | otherwise -> return []
54 | Just s1 <- my_prefix_match "{-#" s, -- -}
55 Just s2 <- my_prefix_match "OPTIONS" (remove_spaces s1),
56 Just s3 <- my_prefix_match "}-#" (reverse s2)
61 -----------------------------------------------------------------------------
62 -- A version of getDirectoryContents that is non-fatal if the
63 -- directory doesn't exist.
65 softGetDirectoryContents d
66 = IO.catch (getDirectoryContents d)
67 (\_ -> do hPutStrLn stderr
68 ("WARNING: error while reading directory " ++ d)
72 -----------------------------------------------------------------------------
73 -- Verify that the 'dirname' portion of a FilePath exists.
75 doesDirNameExist :: FilePath -> IO Bool
76 doesDirNameExist fpath = doesDirectoryExist (directoryOf fpath)
78 -----------------------------------------------------------------------------
79 -- Prefixing underscore to linker-level names
80 prefixUnderscore :: String -> String
82 | cLeadingUnderscore == "YES" = ('_':)
85 -----------------------------------------------------------------------------
88 unknownFlagErr :: String -> a
89 unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
91 unknownFlagsErr :: [String] -> a
92 unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))
94 my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
95 my_partition _ [] = ([],[])
97 = let (bs,cs) = my_partition p as in
100 Just b -> ((a,b):bs,cs)
102 my_prefix_match :: String -> String -> Maybe String
103 my_prefix_match [] rest = Just rest
104 my_prefix_match (_:_) [] = Nothing
105 my_prefix_match (p:pat) (r:rest)
106 | p == r = my_prefix_match pat rest
107 | otherwise = Nothing
111 handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
112 handleDyn = flip catchDyn
114 handle :: (Exception -> IO a) -> IO a -> IO a
115 #if __GLASGOW_HASKELL__ < 501
116 handle = flip Exception.catchAllIO
118 handle h f = f `Exception.catch` \e -> case e of
119 ExitException _ -> throw e
123 split :: Char -> String -> [String]
124 split c s = case rest of
126 _:rest -> chunk : split c rest
127 where (chunk, rest) = break (==c) s
129 add :: IORef [a] -> a -> IO ()
132 writeIORef var (x:xs)
134 addNoDups :: Eq a => IORef [a] -> a -> IO ()
137 unless (x `elem` xs) $ writeIORef var (x:xs)
139 ------------------------------------------------------
140 -- Filename manipulation
141 ------------------------------------------------------
145 splitFilename :: String -> (String,Suffix)
146 splitFilename f = split_longest_prefix f (=='.')
148 getFileSuffix :: String -> Suffix
149 getFileSuffix f = drop_longest_prefix f (=='.')
151 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy.ext")
152 splitFilenameDir :: String -> (String,String)
154 = let (dir, rest) = split_longest_prefix str isPathSeparator
155 real_dir | null dir = "."
159 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
160 splitFilename3 :: String -> (String,String,Suffix)
162 = let (dir, rest) = split_longest_prefix str isPathSeparator
163 (name, ext) = splitFilename rest
164 real_dir | null dir = "."
166 in (real_dir, name, ext)
168 remove_suffix :: Char -> String -> Suffix
170 | null pre = reverse suf
171 | otherwise = reverse pre
172 where (suf,pre) = break (==c) (reverse s)
174 drop_longest_prefix :: String -> (Char -> Bool) -> String
175 drop_longest_prefix s pred = reverse suf
176 where (suf,_pre) = break pred (reverse s)
178 take_longest_prefix :: String -> (Char -> Bool) -> String
179 take_longest_prefix s pred = reverse pre
180 where (_suf,pre) = break pred (reverse s)
182 -- split a string at the last character where 'pred' is True,
183 -- returning a pair of strings. The first component holds the string
184 -- up (but not including) the last character for which 'pred' returned
185 -- True, the second whatever comes after (but also not including the
188 -- If 'pred' returns False for all characters in the string, the original
189 -- string is returned in the second component (and the first one is just
191 split_longest_prefix :: String -> (Char -> Bool) -> (String,String)
192 split_longest_prefix s pred
194 [] -> ([], reverse suf)
195 (_:pre) -> (reverse pre, reverse suf)
196 where (suf,pre) = break pred (reverse s)
198 replaceFilenameSuffix :: FilePath -> Suffix -> FilePath
199 replaceFilenameSuffix s suf = remove_suffix '.' s ++ suf
201 -- directoryOf strips the filename off the input string, returning
203 directoryOf :: FilePath -> String
204 directoryOf = fst . splitFilenameDir
206 replaceFilenameDirectory :: FilePath -> String -> FilePath
207 replaceFilenameDirectory s dir
208 = dir ++ '/':drop_longest_prefix s isPathSeparator
210 remove_spaces :: String -> String
211 remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
213 escapeSpaces :: String -> String
214 escapeSpaces = foldr (\c s -> if isSpace c then '\\':c:s else c:s) ""
216 isPathSeparator :: Char -> Bool
218 #ifdef mingw32_TARGET_OS
219 ch == '/' || ch == '\\'