1 -----------------------------------------------------------------------------
2 -- $Id: DriverUtil.hs,v 1.35 2002/10/17 14:26:18 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 as Exception
21 import DATA_IOREF ( IORef, readIORef, writeIORef )
23 import Directory ( getDirectoryContents, doesDirectoryExist )
29 -----------------------------------------------------------------------------
30 -- Reading OPTIONS pragmas
33 :: String -- input file
34 -> IO [String] -- options, if any
35 getOptionsFromSource file
36 = do h <- openFile file ReadMode
37 catchJust ioErrors (look h `finally` hClose h)
38 (\e -> if isEOFError e then return [] else ioError e)
42 let l = remove_spaces l'
45 | prefixMatch "#" l -> look h
46 | prefixMatch "{-# LINE" l -> look h -- -}
47 | Just opts <- matchOptions l
49 return (words opts ++ rest)
50 | otherwise -> return []
53 | Just s1 <- my_prefix_match "{-#" s, -- -}
54 Just s2 <- my_prefix_match "OPTIONS" (remove_spaces s1),
55 Just s3 <- my_prefix_match "}-#" (reverse s2)
60 -----------------------------------------------------------------------------
61 -- A version of getDirectoryContents that is non-fatal if the
62 -- directory doesn't exist.
64 softGetDirectoryContents d
65 = IO.catch (getDirectoryContents d)
66 (\_ -> do hPutStrLn stderr
67 ("WARNING: error while reading directory " ++ d)
71 -----------------------------------------------------------------------------
72 -- Verify that the 'dirname' portion of a FilePath exists.
74 doesDirNameExist :: FilePath -> IO Bool
75 doesDirNameExist fpath = doesDirectoryExist (directoryOf fpath)
77 -----------------------------------------------------------------------------
78 -- Prefixing underscore to linker-level names
79 prefixUnderscore :: String -> String
81 | cLeadingUnderscore == "YES" = ('_':)
84 -----------------------------------------------------------------------------
87 unknownFlagErr :: String -> a
88 unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
90 unknownFlagsErr :: [String] -> a
91 unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))
93 my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
94 my_partition _ [] = ([],[])
96 = let (bs,cs) = my_partition p as in
99 Just b -> ((a,b):bs,cs)
101 my_prefix_match :: String -> String -> Maybe String
102 my_prefix_match [] rest = Just rest
103 my_prefix_match (_:_) [] = Nothing
104 my_prefix_match (p:pat) (r:rest)
105 | p == r = my_prefix_match pat rest
106 | otherwise = Nothing
110 handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
111 handleDyn = flip catchDyn
113 handle :: (Exception -> IO a) -> IO a -> IO a
114 #if __GLASGOW_HASKELL__ < 501
115 handle = flip Exception.catchAllIO
117 handle h f = f `Exception.catch` \e -> case e of
118 ExitException _ -> throw e
122 split :: Char -> String -> [String]
123 split c s = case rest of
125 _:rest -> chunk : split c rest
126 where (chunk, rest) = break (==c) s
128 add :: IORef [a] -> a -> IO ()
131 writeIORef var (x:xs)
133 addNoDups :: Eq a => IORef [a] -> a -> IO ()
136 unless (x `elem` xs) $ writeIORef var (x:xs)
138 ------------------------------------------------------
139 -- Filename manipulation
140 ------------------------------------------------------
144 splitFilename :: String -> (String,Suffix)
145 splitFilename f = split_longest_prefix f (=='.')
147 getFileSuffix :: String -> Suffix
148 getFileSuffix f = drop_longest_prefix f (=='.')
150 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy.ext")
151 splitFilenameDir :: String -> (String,String)
153 = let (dir, rest) = split_longest_prefix str isPathSeparator
154 real_dir | null dir = "."
158 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
159 splitFilename3 :: String -> (String,String,Suffix)
161 = let (dir, rest) = split_longest_prefix str isPathSeparator
162 (name, ext) = splitFilename rest
163 real_dir | null dir = "."
165 in (real_dir, name, ext)
167 remove_suffix :: Char -> String -> Suffix
169 | null pre = reverse suf
170 | otherwise = reverse pre
171 where (suf,pre) = break (==c) (reverse s)
173 drop_longest_prefix :: String -> (Char -> Bool) -> String
174 drop_longest_prefix s pred = reverse suf
175 where (suf,_pre) = break pred (reverse s)
177 take_longest_prefix :: String -> (Char -> Bool) -> String
178 take_longest_prefix s pred = reverse pre
179 where (_suf,pre) = break pred (reverse s)
181 -- split a string at the last character where 'pred' is True,
182 -- returning a pair of strings. The first component holds the string
183 -- up (but not including) the last character for which 'pred' returned
184 -- True, the second whatever comes after (but also not including the
187 -- If 'pred' returns False for all characters in the string, the original
188 -- string is returned in the second component (and the first one is just
190 split_longest_prefix :: String -> (Char -> Bool) -> (String,String)
191 split_longest_prefix s pred
193 [] -> ([], reverse suf)
194 (_:pre) -> (reverse pre, reverse suf)
195 where (suf,pre) = break pred (reverse s)
197 replaceFilenameSuffix :: FilePath -> Suffix -> FilePath
198 replaceFilenameSuffix s suf = remove_suffix '.' s ++ suf
200 -- directoryOf strips the filename off the input string, returning
202 directoryOf :: FilePath -> String
203 directoryOf = fst . splitFilenameDir
205 replaceFilenameDirectory :: FilePath -> String -> FilePath
206 replaceFilenameDirectory s dir
207 = dir ++ '/':drop_longest_prefix s isPathSeparator
209 remove_spaces :: String -> String
210 remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
212 escapeSpaces :: String -> String
213 escapeSpaces = foldr (\c s -> if isSpace c then '\\':c:s else c:s) ""
215 isPathSeparator :: Char -> Bool
217 #ifdef mingw32_TARGET_OS
218 ch == '/' || ch == '\\'