-- general list processing
zipEqual, zipWithEqual, zipWith3Equal, zipWith4Equal,
zipLazy, stretchZipWith,
+ mapFst, mapSnd,
mapAndUnzip, mapAndUnzip3,
nOfThem, filterOut,
lengthExceeds, lengthIs, lengthAtLeast, listLengthCmp, atLength,
- isSingleton, only,
+ isSingleton, only, singleton,
notNull, snocView,
isIn, isn'tIn,
nTimes,
-- sorting
- sortLe,
+ sortLe, sortWith,
-- transitive closures
transitiveClosure,
mapAccumL, mapAccumR, mapAccumB,
foldl2, count,
- takeList, dropList, splitAtList,
+ takeList, dropList, splitAtList, split,
-- comparisons
isEqual, eqListBy, equalLength, compareLength,
thenCmp, cmpList, prefixMatch, suffixMatch, maybePrefixMatch,
+ removeSpaces,
-- strictness
foldl', seqList,
-- pairs
unzipWith,
- global,
+ global, consIORef,
-- module names
looksLikeModuleName,
-- Floating point stuff
readRational,
+
+ -- IO-ish utilities
+ createDirectoryHierarchy,
+ doesDirNameExist,
+ modificationTimeIfExists,
+
+ later, handleDyn, handle,
+
+ -- Filename utils
+ Suffix,
+ splitFilename, suffixOf, basenameOf, joinFileExt,
+ splitFilenameDir, joinFileName,
+ splitFilename3,
+ splitLongestPrefix,
+ replaceFilenameSuffix, directoryOf, filenameOf,
+ replaceFilenameDirectory,
+ escapeSpaces, isPathSeparator,
+ parseSearchPath,
+ normalisePath, platformPath, pgmPath,
) where
-#include "../includes/ghcconfig.h"
#include "HsVersions.h"
import Panic ( panic, trace )
import FastTypes
-#if __GLASGOW_HASKELL__ <= 408
-import EXCEPTION ( catchIO, justIoErrors, raiseInThread )
-#endif
+import EXCEPTION ( Exception(..), finally, throwDyn, catchDyn, throw )
+import qualified EXCEPTION as Exception
+import DYNAMIC ( Typeable )
import DATA_IOREF ( IORef, newIORef )
import UNSAFE_IO ( unsafePerformIO )
+import DATA_IOREF ( readIORef, writeIORef )
import qualified List ( elem, notElem )
import List ( zipWith4 )
#endif
+import Monad ( when )
+import IO ( catch, isDoesNotExistError )
+import Directory ( doesDirectoryExist, createDirectory )
import Char ( isUpper, isAlphaNum, isSpace, ord, isDigit )
import Ratio ( (%) )
+import Time ( ClockTime )
+import Directory ( getModificationTime )
infixr 9 `thenCmp`
\end{code}
\begin{code}
+mapFst :: (a->c) -> [(a,b)] -> [(c,b)]
+mapSnd :: (b->c) -> [(a,b)] -> [(a,c)]
+
+mapFst f xys = [(f x, y) | (x,y) <- xys]
+mapSnd f xys = [(x, f y) | (x,y) <- xys]
+
mapAndUnzip :: (a -> (b, c)) -> [a] -> ([b], [c])
mapAndUnzip f [] = ([],[])
atLen [] = EQ
atLen _ = GT
+singleton :: a -> [a]
+singleton x = [x]
+
isSingleton :: [a] -> Bool
isSingleton [x] = True
isSingleton _ = False
sortLe :: (a->a->Bool) -> [a] -> [a]
sortLe le = generalNaturalMergeSort le
+
+sortWith :: Ord b => (a->b) -> [a] -> [a]
+sortWith get_key xs = sortLe le xs
+ where
+ x `le` y = get_key x < get_key y
\end{code}
%************************************************************************
where
(ys', ys'') = splitAtList xs ys
+split :: Char -> String -> [String]
+split c s = case rest of
+ [] -> [chunk]
+ _:rest -> chunk : split c rest
+ where (chunk, rest) = break (==c) s
\end{code}
suffixMatch :: Eq a => [a] -> [a] -> Bool
suffixMatch pat str = prefixMatch (reverse pat) (reverse str)
+
+removeSpaces :: String -> String
+removeSpaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
\end{code}
%************************************************************************
global a = unsafePerformIO (newIORef a)
\end{code}
+\begin{code}
+consIORef :: IORef [a] -> a -> IO ()
+consIORef var x = do
+ xs <- readIORef var
+ writeIORef var (x:xs)
+\end{code}
+
Module names:
\begin{code}
[x] -> x
[] -> error ("readRational: no parse:" ++ top_s)
_ -> error ("readRational: ambiguous parse:" ++ top_s)
+
+
+-----------------------------------------------------------------------------
+-- Create a hierarchy of directories
+
+createDirectoryHierarchy :: FilePath -> IO ()
+createDirectoryHierarchy dir = do
+ b <- doesDirectoryExist dir
+ when (not b) $ do
+ createDirectoryHierarchy (directoryOf dir)
+ createDirectory dir
+
+-----------------------------------------------------------------------------
+-- Verify that the 'dirname' portion of a FilePath exists.
+--
+doesDirNameExist :: FilePath -> IO Bool
+doesDirNameExist fpath = doesDirectoryExist (directoryOf fpath)
+
+-- -----------------------------------------------------------------------------
+-- Exception utils
+
+later = flip finally
+
+handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
+handleDyn = flip catchDyn
+
+handle :: (Exception -> IO a) -> IO a -> IO a
+#if __GLASGOW_HASKELL__ < 501
+handle = flip Exception.catchAllIO
+#else
+handle h f = f `Exception.catch` \e -> case e of
+ ExitException _ -> throw e
+ _ -> h e
+#endif
+
+-- --------------------------------------------------------------
+-- check existence & modification time at the same time
+
+modificationTimeIfExists :: FilePath -> IO (Maybe ClockTime)
+modificationTimeIfExists f = do
+ (do t <- getModificationTime f; return (Just t))
+ `IO.catch` \e -> if isDoesNotExistError e
+ then return Nothing
+ else ioError e
+
+-- --------------------------------------------------------------
+-- Filename manipulation
+
+-- Filenames are kept "normalised" inside GHC, using '/' as the path
+-- separator. On Windows these functions will also recognise '\\' as
+-- the path separator, but will generally construct paths using '/'.
+
+type Suffix = String
+
+splitFilename :: String -> (String,Suffix)
+splitFilename f = splitLongestPrefix f (=='.')
+
+basenameOf :: FilePath -> String
+basenameOf = fst . splitFilename
+
+suffixOf :: FilePath -> Suffix
+suffixOf = snd . splitFilename
+
+joinFileExt :: String -> String -> FilePath
+joinFileExt path "" = path
+joinFileExt path ext = path ++ '.':ext
+
+-- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy.ext")
+splitFilenameDir :: String -> (String,String)
+splitFilenameDir str
+ = let (dir, rest) = splitLongestPrefix str isPathSeparator
+ (dir', rest') | null rest = (".", dir)
+ | otherwise = (dir, rest)
+ in (dir', rest')
+
+-- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
+splitFilename3 :: String -> (String,String,Suffix)
+splitFilename3 str
+ = let (dir, rest) = splitFilenameDir str
+ (name, ext) = splitFilename rest
+ in (dir, name, ext)
+
+joinFileName :: String -> String -> FilePath
+joinFileName "" fname = fname
+joinFileName "." fname = fname
+joinFileName dir "" = dir
+joinFileName dir fname = dir ++ '/':fname
+
+-- split a string at the last character where 'pred' is True,
+-- returning a pair of strings. The first component holds the string
+-- up (but not including) the last character for which 'pred' returned
+-- True, the second whatever comes after (but also not including the
+-- last character).
+--
+-- If 'pred' returns False for all characters in the string, the original
+-- string is returned in the first component (and the second one is just
+-- empty).
+splitLongestPrefix :: String -> (Char -> Bool) -> (String,String)
+splitLongestPrefix str pred
+ | null r_pre = (str, [])
+ | otherwise = (reverse (tail r_pre), reverse r_suf)
+ -- 'tail' drops the char satisfying 'pred'
+ where
+ (r_suf, r_pre) = break pred (reverse str)
+
+replaceFilenameSuffix :: FilePath -> Suffix -> FilePath
+replaceFilenameSuffix file suf = basenameOf file `joinFileExt` suf
+
+-- directoryOf strips the filename off the input string, returning
+-- the directory.
+directoryOf :: FilePath -> String
+directoryOf = fst . splitFilenameDir
+
+-- filenameOf strips the directory off the input string, returning
+-- the filename.
+filenameOf :: FilePath -> String
+filenameOf = snd . splitFilenameDir
+
+replaceFilenameDirectory :: FilePath -> String -> FilePath
+replaceFilenameDirectory path dir = dir `joinFileName` filenameOf path
+
+escapeSpaces :: String -> String
+escapeSpaces = foldr (\c s -> if isSpace c then '\\':c:s else c:s) ""
+
+isPathSeparator :: Char -> Bool
+isPathSeparator ch =
+#ifdef mingw32_TARGET_OS
+ ch == '/' || ch == '\\'
+#else
+ ch == '/'
+#endif
+
+--------------------------------------------------------------
+-- * Search path
+--------------------------------------------------------------
+
+-- | The function splits the given string to substrings
+-- using the 'searchPathSeparator'.
+parseSearchPath :: String -> [FilePath]
+parseSearchPath path = split path
+ where
+ split :: String -> [String]
+ split s =
+ case rest' of
+ [] -> [chunk]
+ _:rest -> chunk : split rest
+ where
+ chunk =
+ case chunk' of
+#ifdef mingw32_HOST_OS
+ ('\"':xs@(_:_)) | last xs == '\"' -> init xs
+#endif
+ _ -> chunk'
+
+ (chunk', rest') = break (==searchPathSeparator) s
+
+-- | A platform-specific character used to separate search path strings in
+-- environment variables. The separator is a colon (\":\") on Unix and Macintosh,
+-- and a semicolon (\";\") on the Windows operating system.
+searchPathSeparator :: Char
+#if mingw32_HOST_OS || mingw32_TARGET_OS
+searchPathSeparator = ';'
+#else
+searchPathSeparator = ':'
+#endif
+
+-----------------------------------------------------------------------------
+-- Convert filepath into platform / MSDOS form.
+
+-- We maintain path names in Unix form ('/'-separated) right until
+-- the last moment. On Windows we dos-ify them just before passing them
+-- to the Windows command.
+--
+-- The alternative, of using '/' consistently on Unix and '\' on Windows,
+-- proved quite awkward. There were a lot more calls to platformPath,
+-- and even on Windows we might invoke a unix-like utility (eg 'sh'), which
+-- interpreted a command line 'foo\baz' as 'foobaz'.
+
+normalisePath :: String -> String
+-- Just changes '\' to '/'
+
+pgmPath :: String -- Directory string in Unix format
+ -> String -- Program name with no directory separators
+ -- (e.g. copy /y)
+ -> String -- Program invocation string in native format
+
+#if defined(mingw32_HOST_OS)
+--------------------- Windows version ------------------
+normalisePath xs = subst '\\' '/' xs
+pgmPath dir pgm = platformPath dir ++ '\\' : pgm
+platformPath p = subst '/' '\\' p
+
+subst a b ls = map (\ x -> if x == a then b else x) ls
+#else
+--------------------- Non-Windows version --------------
+normalisePath xs = xs
+pgmPath dir pgm = dir ++ '/' : pgm
+platformPath stuff = stuff
+--------------------------------------------------------
+#endif
\end{code}
projects / ghc-hetmet.git / blobdiff