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filepath
by Ian Lynagh 27 Jan '08

27 Jan '08

Hi Neil, I'm having some problems using filepath in GHC. I think some of these we might have discussed before, but if so I've forgotten what the conclusion was, if any, and I can't see the answers in the docs. The first is this: Prelude System.FilePath> "." </> "foo" "./foo" which means we get things like [2 of 2] Compiling GHC.Foo ( ./GHC/Foo.hs, ./GHC/Foo.o ) rather than [2 of 2] Compiling GHC.Foo ( GHC/Foo.hs, GHC/Foo.o ) Is there a reason the result shouldn't be "foo"? Possibly relatedly, the current directory seems to be "" rather than ".". This turns up in at least a couple of areas: Prelude System.FilePath> normalise "." "" Prelude System.FilePath> splitFileName "foo" ("","foo") I expected "." and "./" respectively, rather than the ""s. This causes problems when giving arguments to library functions or programs, which generally want "." or "./" rather than "", and if you are displaying a directory to the user then you again probably don't want to print "". As an example, I had a problem where GHC was running "gcc -I foo" rather than "gcc -I. foo". This looks like a straightforward bug to me: Prelude System.FilePath> normalise "./" "/" I'm not convinced by Prelude System.FilePath> isValid "" True I don't think I could "create a file like it". Finally, could splitSearchPath please take an extra argument, a list of FilePaths, to be appended to the result if it ends with a : or ; (as appropriate)? Thanks Ian

13 34

Quick Hackage question
by Adrian Hey 26 Jan '08

26 Jan '08

Hello, Could someone explain why some packages in Hackage have links to the haddock for exposed modules and others don't? Also some seem to have links to a "buildlog", but others don't. What's going on? Thanks -- Adrian Hey

5 12

Re: Network.CGI changes
by Björn Bringert 25 Jan '08

25 Jan '08

Hi Frederik, (I'm CC:ing the libraries list, so that anyone who wants to have Network.CGI.Compat back in the cgi package can shout.) That exact module actually used to exist in the cgi package as well (it implemented the complete API of the old Network.CGI), but after a few releases I removed it since it didn't seem to have any users. That was quite a long time ago, and you are the first person to complain. The purpose of cgi-compat is actually not to provide Network.CGI.Compat, but rather to be installable on older GHC versions, hence the main module name Network.NewCGI. I'm not sure if there is sufficient demand for adding Network.CGI.Compat back into the cgi package. The old Network.CGI seemed to have very few users, due to to it's restrictions. You can always get Network.CGI.Compat from here, and include it in your program: http://www.cs.chalmers.se/~bringert/darcs/cgi-compat/Network/CGI/Compat.hs /Björn Frederik Eaton wrote: > Dear Johannes, > > Thanks, that works for me. > > Bjorn, perhaps it would be easier to put these five lines in a module > (Network.CGI.Compat?) in the new package, rather than having people > maintain and download a separate cgi-compat package? Perhaps the two > other functions in the old CGI interface can be implemented in terms > of the new API as well? > > Best wishes, > > Frederik > > On Mon, Jan 21, 2008 at 09:50:46AM +0100, Johannes Waldmann wrote: >> If you need the old "wrapper" function, then use something like this: >> >> wrapper :: ([(String,String)] -> IO Html) -> IO () >> wrapper f = runCGI $ do >> >> e <- getInputs >> a <- lift $ f $ e >> output $ renderHtml a >> >> best regards, Johannes Waldmann. >> >

3 3

Re: Readline read_history and write_history addition
by Alexander Dunlap 22 Jan '08

22 Jan '08

On Jan 21, 2008 9:15 PM, Alexander Dunlap <alexander.dunlap(a)gmail.com> wrote: > > On Jan 21, 2008 9:00 PM, Sterling Clover <s.clover(a)gmail.com> wrote: > > It seems to me that the proper solution would be to throw the proper > > exception for the errno, warning of such an exception clearly in the > > documentation. If the user of the library wants to swallow the > > exception themselves and continue with a catch or bracket statement, > > they should have that option, but they should also have the > > flexibility to handle exceptions in a particular way, should they > > need that functionality. There's no reason a library binding should > > conceal any potentially useful functionality of the underlying > > library. If the errors that were returned were unique, Either String > > Bool might be an option, but as we've got a built-in standard for > > handling precisely the sorts of IO errors that are returned, it seems > > silly not to use it. > > > > --S > > > > On Jan 21, 2008, at 11:34 PM, Alexander Dunlap wrote: > > > > > On Jan 21, 2008 10:27 AM, Judah Jacobson <judah.jacobson(a)gmail.com> > > > wrote: > > >> > > > > >> One more suggestion, from Robert Dockins (author of the Shellac and > > >> Shellac-readline packages): > > >> > > >>> The only concern I have is that this patch doesn't seem to > > >>> be handling errors properly. read_history and write_history > > >>> should return > > >>> errno, but this binding has them returning (). These functions > > >>> do file > > >>> operations and therefore can fail; we want (be able) to know when > > >>> that > > >>> happens. > > >> > > >> I think we should just throw an error if those functions return a > > >> nonzero value; for example, we already do that in the functions > > >> readInitFile and parseAndBind. > > >> > > >> Thanks, > > >> -Judah > > >> > > > > > > I'm reluctant to use the throw an error solution because these > > > functions failing does not have to be the end of the world (or even > > > necessarily handled by the application). If the history file can't be > > > found, the user just doesn't get their history restored (in fact, this > > > may not even be a problem: if the user hasn't used the application > > > before, readHistory will fail silently on the first run and then work > > > fine after the history has been saved at the end of the first > > > session). Similarly, writing or appending to the history file is > > > generally not an essential task and can fail without terminating the > > > program. (I know there's catch, but I don't think the programmer even > > > has to worry about it that much.) I think that just returning a value > > > for success and a value for failure would be appropriate. > > > > > > However, I'm not sure how we would implement it without using error. > > > The usual Haskell solution would be to use Maybe, but what would we > > > have Just of, since the functions don't return real values? Is Just () > > > an accepted idiom? (I've never seen it, but I haven't seen all the > > > Haskell there is to see, either.) > > > > > > Thanks. > > > Alex > > > _______________________________________________ > > > Libraries mailing list > > > Libraries(a)haskell.org > > > http://www.haskell.org/mailman/listinfo/libraries > > > > _______________________________________________ > > Libraries mailing list > > Libraries(a)haskell.org > > http://www.haskell.org/mailman/listinfo/libraries > > > > Okay, I was unaware that that was the accepted way to handle errors > for IO operations. If that's the standard, I guess we ought to follow > it. Attached is a revised patch, including the requested > historyMaxEntries function and a couple others for completeness. > > Alex Sorry. I forgot to attach the patch. Here it is. Alex

1 0

Proposal: Add split and splitWith (trac #2048)
by Twan van Laarhoven 21 Jan '08

21 Jan '08

Hello Haskellers, An often requested function is 'split', to split a list into parts delimited by some separator. ByteString has the functions split and splitWith for this purpose. I propose we add equivalents to Data.List: > split :: Eq a => a -> [a] -> [[a]] > split x = splitWith (x==) > > splitWith :: (a -> Bool) -> [a] -> [[a]] > splitWith p xs = ys : case zs of > [] -> [] > _:ws -> splitWith p ws > where (ys,zs) = break p xs trac: http://hackage.haskell.org/trac/ghc/ticket/2048 deadline: two weeks from now, January 30 Twan

11 22

GHC options in Cabal
by Adrian Hey 19 Jan '08

19 Jan '08

Hello, Looking at the latest Cabal docs, I see that in addition to ghc-options, there are also ghc-prof-options and ghc-shared-options. What isn't clear to me though from the docs is that are the latter two in addition to the first, or are they a substitute for the first (for profiling/shared). IOW, if I already have.. ghc-options: -O2 will the O2 also be applied to profiling build (say)? Or do I need an extra explicit.. ghc-prof-options: -O2 Thanks -- Adrian Hey

3 7

darcs patch: make Alex only occupy {alex,Alex,ALEX}* names (still assuming Prelude)
by Isaac Dupree 18 Jan '08

18 Jan '08

Happy and Alex add imports to the file they contain: Char (ord), Array (if given `-a` flag, for example -- it's not reliable), etc. Adding an import can cause errors; for example, importing unboxed arithmetic from GHC.Exts caused an error when I imported a differently-defined set of functions named the same way; I so far locally added a 'hiding' clause to work around that, to work around those errors: in ghc/compiler/parser/Lexer.x import FastTypes hiding ((+#),(>=#),(==#)) Removing an import can cause errors: for example, one .x (or was it .y?) module in GHC's code used Array without importing it, and another used ord without importing it (these were fixed in GHC head and 6.8 branch). Therefore I propose that, though it may break code in the short term, Happy and Alex should only import things qualified as AlexSomething. It didn't make things too ugly; they still rely on sufficient basic Prelude stuff being imported without qualification by the module that uses Happy/Alex, but that seems the best arrangement to me anyway. (for example, if a module wants to redefine (&&) in a compatible way -- this has been done with type-classes, Alex will at least try to use that instead of importing (&&) unqualified from the Prelude and getting an ambiguity error) This patch does that for Alex, and I've been using it to compile GHC; a similar patch would be a similar amount of work to make for Happy. Thoughts? Does this seem like a good idea? Thu Dec 27 13:57:22 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * make Alex only occupy {alex,Alex,ALEX}* names (still assuming Prelude) New patches: [make Alex only occupy {alex,Alex,ALEX}* names (still assuming Prelude) Isaac Dupree <id(a)isaac.cedarswampstudios.org>**20071227185722] { hunk ./src/Info.hs 63 --- = str "Array.array " . shows (bounds arr) . space +-- = str "AlexArray.array " . shows (bounds arr) . space hunk ./src/Main.hs 179 - "import Data.Array\n" ++ - "import Data.Char (ord)\n" ++ - "import Data.Array.Base (unsafeAt)\n" ++ + "import qualified Data.Array as AlexArray\n" ++ + "import qualified Data.Char as AlexChar (ord)\n" ++ + "import qualified Data.Array.Base as AlexArrayBase (unsafeAt)\n" ++ hunk ./src/Main.hs 183 - "import Array\n" ++ - "import Char (ord)\n" ++ + "import qualified Array as AlexArray\n" ++ + "import qualified Char as AlexChar (ord)\n" ++ hunk ./src/Main.hs 189 - "import GHC.Exts\n" ++ + "import qualified GHC.Exts as AlexGHCExts\n" ++ hunk ./src/Main.hs 191 - "import GlaExts\n" ++ + "import qualified GlaExts as AlexGHCExts\n" ++ hunk ./src/Main.hs 195 -import_debug = "#if __GLASGOW_HASKELL__ >= 503\n" ++ - "import System.IO\n" ++ - "import System.IO.Unsafe\n" ++ - "import Debug.Trace\n" ++ +import_debug = "#ifdef ALEX_DEBUG\n" ++ +--"IOExts" is dead: assume arbitrary compilers use the hierarchical names + "#if !defined(__GLASGOW_HASKELL__) || __GLASGOW_HASKELL__ >= 503\n" ++ + "import qualified System.IO as AlexDebug\n" ++ + "import qualified System.IO.Unsafe as AlexDebug\n" ++ + "import qualified Debug.Trace as AlexDebug\n" ++ hunk ./src/Main.hs 202 - "import IO\n" ++ - "import IOExts\n" ++ + "import qualified IO as AlexDebug\n" ++ + "import qualified IOExts as AlexDebug\n" ++ + "#endif\n" ++ hunk ./src/Output.hs 60 - str nm . str " :: Array Int Int\n" - . str nm . str " = listArray (0," . shows upper_bound + str nm . str " :: AlexArray.Array Int Int\n" + . str nm . str " = AlexArray.listArray (0," . shows upper_bound hunk ./src/Output.hs 67 - -- str accept_nm . str " :: Array Int (Accept Code)\n" - str accept_nm . str " = listArray (0::Int," . shows n_states + -- str accept_nm . str " :: AlexArray.Array Int (Accept Code)\n" + str accept_nm . str " = AlexArray.listArray (0::Int," . shows n_states hunk ./src/Output.hs 111 - = str "array " . shows (bounds arr) . space + = str "AlexArray.array " . shows (bounds arr) . space hunk ./src/Scan.hs 1 -{-# OPTIONS -fglasgow-exts -cpp #-} -{-# LINE 13 "src/Scan.x" #-} -module Scan(lexer, AlexPosn(..), Token(..), Tkn(..), tokPosn) where - -import Data.Char -import ParseMonad ---import Debug.Trace - -#if __GLASGOW_HASKELL__ >= 603 -#include "ghcconfig.h" -#else -#include "config.h" -#endif -#if __GLASGOW_HASKELL__ >= 503 -import Data.Array -import Data.Char (ord) -import Data.Array.Base (unsafeAt) -#else -import Array -import Char (ord) -#endif -#if __GLASGOW_HASKELL__ >= 503 -import GHC.Exts -#else -import GlaExts -#endif -alex_base :: AlexAddr -alex_base = AlexA# 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- -alex_table :: AlexAddr -alex_table = AlexA# 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- -alex_check :: AlexAddr -alex_check = AlexA# 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- -alex_deflt :: AlexAddr -alex_deflt = AlexA# "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x06\x00\x06\x00\xff\xff\xff\xff\xff\xff\x0b\x00\x0b\x00\xff\xff\x15\x00\xff\xff\x15\x00\xff\xff\xff\xff\xff\xff\xff\xff\x15\x00\x15\x00\xff\xff\xff\xff\x19\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x3e\x00\xff\xff\x3e\x00\x3e\x00\xff\xff\xff\xff\x44\x00\xff\xff\x44\x00\x44\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x4c\x00"# - -alex_accept = listArray (0::Int,77) [[],[(AlexAcc (alex_action_21))],[],[],[(AlexAcc (alex_action_0))],[(AlexAcc (alex_action_0))],[(AlexAcc (alex_action_0))],[],[(AlexAcc (alex_action_4))],[(AlexAcc (alex_action_1))],[(AlexAcc (alex_action_10))],[],[(AlexAcc (alex_action_2))],[(AlexAcc (alex_action_2))],[],[],[(AlexAcc (alex_action_10))],[(AlexAcc (alex_action_10))],[],[],[],[],[],[(AlexAccPred (alex_action_3) (alexRightContext 24)),(AlexAcc (alex_action_4))],[],[(AlexAccSkip)],[(AlexAcc (alex_action_4))],[(AlexAcc (alex_action_4))],[(AlexAcc (alex_action_5))],[],[],[],[],[],[],[],[(AlexAcc (alex_action_6))],[(AlexAcc (alex_action_6))],[(AlexAcc (alex_action_10))],[(AlexAcc (alex_action_7))],[(AlexAcc (alex_action_9))],[(AlexAcc (alex_action_8))],[(AlexAcc (alex_action_9))],[(AlexAcc (alex_action_9))],[(AlexAcc (alex_action_10))],[(AlexAcc (alex_action_10))],[(AlexAcc (alex_action_11))],[(AlexAcc (alex_action_11))],[(AlexAcc (alex_action_11))],[],[],[],[(AlexAcc (alex_action_12))],[(AlexAcc (alex_action_12))],[(AlexAcc (alex_action_12))],[],[],[],[(AlexAcc (alex_action_13))],[(AlexAcc (alex_action_13))],[],[],[],[],[(AlexAcc (alex_action_14))],[(AlexAcc (alex_action_14))],[],[],[],[],[(AlexAcc (alex_action_15))],[(AlexAcc (alex_action_16))],[(AlexAcc (alex_action_17))],[(AlexAcc (alex_action_17))],[(AlexAcc (alex_action_18))],[(AlexAcc (alex_action_19))],[(AlexAcc (alex_action_20))],[]] -{-# LINE 73 "src/Scan.x" #-} - --- ----------------------------------------------------------------------------- --- Token type - -data Token = T AlexPosn Tkn - deriving Show - -tokPosn (T p _) = p - -data Tkn - = SpecialT Char - | CodeT String - | ZeroT - | IdT String - | StringT String - | BindT String - | CharT Char - | SMacT String - | RMacT String - | SMacDefT String - | RMacDefT String - | NumT Int - | WrapperT - | EOFT - deriving Show - --- ----------------------------------------------------------------------------- --- Token functions - -special (p,_,str) ln = return $ T p (SpecialT (head str)) -zero (p,_,str) ln = return $ T p ZeroT -string (p,_,str) ln = return $ T p (StringT (extract ln str)) -bind (p,_,str) ln = return $ T p (BindT (takeWhile isIdChar str)) -escape (p,_,str) ln = return $ T p (CharT (esc str)) -decch (p,_,str) ln = return $ T p (CharT (do_ech 10 ln (take (ln-1) (tail str)))) -hexch (p,_,str) ln = return $ T p (CharT (do_ech 16 ln (take (ln-2) (drop 2 str)))) -octch (p,_,str) ln = return $ T p (CharT (do_ech 8 ln (take (ln-2) (drop 2 str)))) -char (p,_,str) ln = return $ T p (CharT (head str)) -smac (p,_,str) ln = return $ T p (SMacT (mac ln str)) -rmac (p,_,str) ln = return $ T p (RMacT (mac ln str)) -smacdef (p,_,str) ln = return $ T p (SMacDefT (macdef ln str)) -rmacdef (p,_,str) ln = return $ T p (RMacDefT (macdef ln str)) -startcode (p,_,str) ln = return $ T p (IdT (take ln str)) -wrapper (p,_,str) ln = return $ T p WrapperT - -isIdChar c = isAlphaNum c || c `elem` "_'" - -extract ln str = take (ln-2) (tail str) - -do_ech radix ln str = chr (parseInt radix str) - -mac ln (_ : str) = take (ln-1) str - -macdef ln (_ : str) = takeWhile (not.isSpace) str - -esc (_ : x : _) = - case x of - 'a' -> '\a' - 'b' -> '\b' - 'f' -> '\f' - 'n' -> '\n' - 'r' -> '\r' - 't' -> '\t' - 'v' -> '\v' - c -> c - -parseInt :: Int -> String -> Int -parseInt radix ds = foldl1 (\n d -> n * radix + d) (map digitToInt ds) - --- In brace-delimited code, we have to be careful to match braces --- within the code, but ignore braces inside strings and character --- literals. We do an approximate job (doing it properly requires --- implementing a large chunk of the Haskell lexical syntax). - -code (p,_,inp) len = do - inp <- getInput - go inp 1 "" - where - go inp 0 cs = do - setInput inp - return (T p (CodeT (reverse (tail cs)))) - go inp n cs = do - case alexGetChar inp of - Nothing -> err inp - Just (c,inp) -> - case c of - '{' -> go inp (n+1) (c:cs) - '}' -> go inp (n-1) (c:cs) - '\'' -> go_char inp n (c:cs) - '\"' -> go_str inp n (c:cs) '\"' - c -> go inp n (c:cs) - - -- try to catch occurrences of ' within an identifier - go_char inp n (c1:c2:cs) | isAlphaNum c2 = go inp n (c1:c2:cs) - go_char inp n cs = go_str inp n cs '\'' - - go_str inp n cs end = do - case alexGetChar inp of - Nothing -> err inp - Just (c,inp) - | c == end -> go inp n (c:cs) - | otherwise -> - case c of - '\\' -> case alexGetChar inp of - Nothing -> err inp - Just (d,inp) -> go_str inp n (d:c:cs) end - c -> go_str inp n (c:cs) end - - err inp = do setInput inp; lexError "lexical error in code fragment" - - - -lexError s = do - (p,_,input) <- getInput - failP (s ++ (if (not (null input)) - then " at " ++ show (head input) - else " at end of file")) - -lexer :: (Token -> P a) -> P a -lexer cont = lexToken >>= cont - -lexToken :: P Token -lexToken = do - inp@(p,_,_) <- getInput - sc <- getStartCode - case alexScan inp sc of - AlexEOF -> return (T p EOFT) - AlexError _ -> lexError "lexical error" - AlexSkip inp1 len -> do - setInput inp1 - lexToken - AlexToken inp1 len t -> do - setInput inp1 - t inp len - -type Action = AlexInput -> Int -> P Token - -skip :: Action -skip _ _ = lexToken - -andBegin :: Action -> StartCode -> Action -andBegin act sc inp len = setStartCode sc >> act inp len - - -afterstartcodes,startcodes :: Int -afterstartcodes = 1 -startcodes = 2 -alex_action_0 = skip -alex_action_1 = string -alex_action_2 = bind -alex_action_3 = code -alex_action_4 = special -alex_action_5 = wrapper -alex_action_6 = decch -alex_action_7 = hexch -alex_action_8 = octch -alex_action_9 = escape -alex_action_10 = char -alex_action_11 = smac -alex_action_12 = rmac -alex_action_13 = smacdef -alex_action_14 = rmacdef -alex_action_15 = special `andBegin` startcodes -alex_action_16 = zero -alex_action_17 = startcode -alex_action_18 = special -alex_action_19 = special `andBegin` afterstartcodes -alex_action_20 = special `andBegin` 0 -alex_action_21 = skip `andBegin` 0 -{-# LINE 1 "GenericTemplate.hs" #-} -{-# LINE 1 "<built-in>" #-} -{-# LINE 1 "<command line>" #-} -{-# LINE 1 "GenericTemplate.hs" #-} --- ----------------------------------------------------------------------------- --- ALEX TEMPLATE --- --- This code is in the PUBLIC DOMAIN; you may copy it freely and use --- it for any purpose whatsoever. - --- ----------------------------------------------------------------------------- --- INTERNALS and main scanner engine - -{-# LINE 35 "GenericTemplate.hs" #-} - -{-# LINE 45 "GenericTemplate.hs" #-} - - -data AlexAddr = AlexA# Addr# - -#if __GLASGOW_HASKELL__ < 503 -uncheckedShiftL# = shiftL# -#endif - -{-# INLINE alexIndexInt16OffAddr #-} -alexIndexInt16OffAddr (AlexA# arr) off = -#ifdef WORDS_BIGENDIAN - narrow16Int# i - where - i = word2Int# ((high `uncheckedShiftL#` 8#) `or#` low) - high = int2Word# (ord# (indexCharOffAddr# arr (off' +# 1#))) - low = int2Word# (ord# (indexCharOffAddr# arr off')) - off' = off *# 2# -#else - indexInt16OffAddr# arr off -#endif - - - - - -{-# INLINE alexIndexInt32OffAddr #-} -alexIndexInt32OffAddr (AlexA# arr) off = -#ifdef WORDS_BIGENDIAN - narrow32Int# i - where - i = word2Int# ((b3 `uncheckedShiftL#` 24#) `or#` - (b2 `uncheckedShiftL#` 16#) `or#` - (b1 `uncheckedShiftL#` 8#) `or#` b0) - b3 = int2Word# (ord# (indexCharOffAddr# arr (off' +# 3#))) - b2 = int2Word# (ord# (indexCharOffAddr# arr (off' +# 2#))) - b1 = int2Word# (ord# (indexCharOffAddr# arr (off' +# 1#))) - b0 = int2Word# (ord# (indexCharOffAddr# arr off')) - off' = off *# 4# -#else - indexInt32OffAddr# arr off -#endif - - - - - -#if __GLASGOW_HASKELL__ < 503 -quickIndex arr i = arr ! i -#else --- GHC >= 503, unsafeAt is available from Data.Array.Base. -quickIndex = unsafeAt -#endif - - - - --- ----------------------------------------------------------------------------- --- Main lexing routines - -data AlexReturn a - = AlexEOF - | AlexError !AlexInput - | AlexSkip !AlexInput !Int - | AlexToken !AlexInput !Int a - --- alexScan :: AlexInput -> StartCode -> AlexReturn a -alexScan input (I# (sc)) - = alexScanUser undefined input (I# (sc)) - -alexScanUser user input (I# (sc)) - = case alex_scan_tkn user input 0# input sc AlexNone of - (AlexNone, input') -> - case alexGetChar input of - Nothing -> - - - - AlexEOF - Just _ -> - - - - AlexError input' - - (AlexLastSkip input len, _) -> - - - - AlexSkip input len - - (AlexLastAcc k input len, _) -> - - - - AlexToken input len k - - --- Push the input through the DFA, remembering the most recent accepting --- state it encountered. - -alex_scan_tkn user orig_input len input s last_acc = - input `seq` -- strict in the input - let - new_acc = check_accs (alex_accept `quickIndex` (I# (s))) - in - new_acc `seq` - case alexGetChar input of - Nothing -> (new_acc, input) - Just (c, new_input) -> - - - - let - base = alexIndexInt32OffAddr alex_base s - (I# (ord_c)) = ord c - offset = (base +# ord_c) - check = alexIndexInt16OffAddr alex_check offset - - new_s = if (offset >=# 0#) && (check ==# ord_c) - then alexIndexInt16OffAddr alex_table offset - else alexIndexInt16OffAddr alex_deflt s - in - case new_s of - -1# -> (new_acc, input) - -- on an error, we want to keep the input *before* the - -- character that failed, not after. - _ -> alex_scan_tkn user orig_input (len +# 1#) - new_input new_s new_acc - - where - check_accs [] = last_acc - check_accs (AlexAcc a : _) = AlexLastAcc a input (I# (len)) - check_accs (AlexAccSkip : _) = AlexLastSkip input (I# (len)) - check_accs (AlexAccPred a pred : rest) - | pred user orig_input (I# (len)) input - = AlexLastAcc a input (I# (len)) - check_accs (AlexAccSkipPred pred : rest) - | pred user orig_input (I# (len)) input - = AlexLastSkip input (I# (len)) - check_accs (_ : rest) = check_accs rest - -data AlexLastAcc a - = AlexNone - | AlexLastAcc a !AlexInput !Int - | AlexLastSkip !AlexInput !Int - -data AlexAcc a user - = AlexAcc a - | AlexAccSkip - | AlexAccPred a (AlexAccPred user) - | AlexAccSkipPred (AlexAccPred user) - -type AlexAccPred user = user -> AlexInput -> Int -> AlexInput -> Bool - --- ----------------------------------------------------------------------------- --- Predicates on a rule - -alexAndPred p1 p2 user in1 len in2 - = p1 user in1 len in2 && p2 user in1 len in2 - ---alexPrevCharIsPred :: Char -> AlexAccPred _ -alexPrevCharIs c _ input _ _ = c == alexInputPrevChar input - ---alexPrevCharIsOneOfPred :: Array Char Bool -> AlexAccPred _ -alexPrevCharIsOneOf arr _ input _ _ = arr ! alexInputPrevChar input - ---alexRightContext :: Int -> AlexAccPred _ -alexRightContext (I# (sc)) user _ _ input = - case alex_scan_tkn user input 0# input sc AlexNone of - (AlexNone, _) -> False - _ -> True - -- TODO: there's no need to find the longest - -- match when checking the right context, just - -- the first match will do. - --- used by wrappers -iUnbox (I# (i)) = i rmfile ./src/Scan.hs hunk ./templates/GenericTemplate.hs 12 -#define IBOX(n) (I# (n)) -#define FAST_INT Int# -#define LT(n,m) (n <# m) -#define GTE(n,m) (n >=# m) -#define EQ(n,m) (n ==# m) -#define PLUS(n,m) (n +# m) -#define MINUS(n,m) (n -# m) -#define TIMES(n,m) (n *# m) -#define NEGATE(n) (negateInt# (n)) +#define IBOX(n) (AlexGHCExts.I# (n)) +#define IUNBOX(n) (case (n) of AlexGHCExts.I# alexX -> alexX) +#define FAST_INT AlexGHCExts.Int# +#define LT(n,m) (n AlexGHCExts.<# m) +#define GTE(n,m) (n AlexGHCExts.>=# m) +#define EQ(n,m) (n AlexGHCExts.==# m) +#define PLUS(n,m) (n AlexGHCExts.+# m) +#define MINUS(n,m) (n AlexGHCExts.-# m) +#define TIMES(n,m) (n AlexGHCExts.*# m) +#define NEGATE(n) (AlexGHCExts.negateInt# (n)) hunk ./templates/GenericTemplate.hs 47 +alexSafeIndex arr i = arr AlexArray.! i hunk ./templates/GenericTemplate.hs 49 -data AlexAddr = AlexA# Addr# +ALEX_IF_GHC_LT_503 +alexQuickIndex arr i = arr `alexSafeIndex` i +ALEX_ELSE +-- GHC >= 503, unsafeAt is available from Data.Array.Base. +alexQuickIndex = AlexArrayBase.unsafeAt +ALEX_ENDIF +#else +alexQuickIndex arr i = arr `alexSafeIndex` i +#endif + +#ifdef ALEX_GHC +data AlexAddr = AlexA# AlexGHCExts.Addr# hunk ./templates/GenericTemplate.hs 63 -uncheckedShiftL# = shiftL# +alexUncheckedShiftL = AlexGHCExts.shiftL +ALEX_ELSE +alexUncheckedShiftL = AlexGHCExts.uncheckedShiftL# hunk ./templates/GenericTemplate.hs 71 - narrow16Int# i + AlexGHCExts.narrow16Int# i hunk ./templates/GenericTemplate.hs 73 - i = word2Int# ((high `uncheckedShiftL#` 8#) `or#` low) - high = int2Word# (ord# (indexCharOffAddr# arr (off' +# 1#))) - low = int2Word# (ord# (indexCharOffAddr# arr off')) - off' = off *# 2# + i = AlexGHCExts.word2Int# ((high `alexUncheckedShiftL` 8#) `AlexGHCExts.or#` low) + high = AlexGHCExts.int2Word# (AlexGHCExts.ord# (AlexGHCExts.indexCharOffAddr# arr (off' AlexGHCExts.+# 1#))) + low = AlexGHCExts.int2Word# (AlexGHCExts.ord# (AlexGHCExts.indexCharOffAddr# arr off')) + off' = off AlexGHCExts.*# 2# hunk ./templates/GenericTemplate.hs 78 - indexInt16OffAddr# arr off + AlexGHCExts.indexInt16OffAddr# arr off hunk ./templates/GenericTemplate.hs 81 -alexIndexInt16OffAddr arr off = arr ! off +alexIndexInt16OffAddr arr off = arr `alexQuickIndex` off hunk ./templates/GenericTemplate.hs 88 - narrow32Int# i + AlexGHCExts.narrow32Int# i hunk ./templates/GenericTemplate.hs 90 - i = word2Int# ((b3 `uncheckedShiftL#` 24#) `or#` - (b2 `uncheckedShiftL#` 16#) `or#` - (b1 `uncheckedShiftL#` 8#) `or#` b0) - b3 = int2Word# (ord# (indexCharOffAddr# arr (off' +# 3#))) - b2 = int2Word# (ord# (indexCharOffAddr# arr (off' +# 2#))) - b1 = int2Word# (ord# (indexCharOffAddr# arr (off' +# 1#))) - b0 = int2Word# (ord# (indexCharOffAddr# arr off')) - off' = off *# 4# + i = AlexGHCExts.word2Int# ((b3 `alexUncheckedShiftL` 24#) `AlexGHCExts.or#` + (b2 `alexUncheckedShiftL` 16#) `AlexGHCExts.or#` + (b1 `alexUncheckedShiftL` 8#) `AlexGHCExts.or#` b0) + b3 = AlexGHCExts.int2Word# (AlexGHCExts.ord# (AlexGHCExts.indexCharOffAddr# arr (off' AlexGHCExts.+# 3#))) + b2 = AlexGHCExts.int2Word# (AlexGHCExts.ord# (AlexGHCExts.indexCharOffAddr# arr (off' AlexGHCExts.+# 2#))) + b1 = AlexGHCExts.int2Word# (AlexGHCExts.ord# (AlexGHCExts.indexCharOffAddr# arr (off' AlexGHCExts.+# 1#))) + b0 = AlexGHCExts.int2Word# (AlexGHCExts.ord# (AlexGHCExts.indexCharOffAddr# arr off')) + off' = off AlexGHCExts.*# 4# hunk ./templates/GenericTemplate.hs 99 - indexInt32OffAddr# arr off -ALEX_ENDIF -#else -alexIndexInt32OffAddr arr off = arr ! off -#endif - -#ifdef ALEX_GHC -ALEX_IF_GHC_LT_503 -quickIndex arr i = arr ! i -ALEX_ELSE --- GHC >= 503, unsafeAt is available from Data.Array.Base. -quickIndex = unsafeAt + AlexGHCExts.indexInt32OffAddr# arr off hunk ./templates/GenericTemplate.hs 102 -quickIndex arr i = arr ! i +alexIndexInt32OffAddr arr off = arr `alexQuickIndex` off hunk ./templates/GenericTemplate.hs 124 - trace ("End of input.") $ + AlexDebug.trace ("End of input.") $ hunk ./templates/GenericTemplate.hs 129 - trace ("Error.") $ + AlexDebug.trace ("Error.") $ hunk ./templates/GenericTemplate.hs 135 - trace ("Skipping.") $ + AlexDebug.trace ("Skipping.") $ hunk ./templates/GenericTemplate.hs 141 - trace ("Accept.") $ + AlexDebug.trace ("Accept.") $ hunk ./templates/GenericTemplate.hs 152 - new_acc = check_accs (alex_accept `quickIndex` IBOX(s)) + new_acc = check_accs (alex_accept `alexQuickIndex` IBOX(s)) hunk ./templates/GenericTemplate.hs 159 - trace ("State: " ++ show IBOX(s) ++ ", char: " ++ show c) $ + AlexDebug.trace ("State: " ++ show IBOX(s) ++ ", char: " ++ show c) $ hunk ./templates/GenericTemplate.hs 163 - IBOX(ord_c) = ord c + IBOX(ord_c) = AlexChar.ord c hunk ./templates/GenericTemplate.hs 213 -alexPrevCharIsOneOf arr _ input _ _ = arr ! alexInputPrevChar input +alexPrevCharIsOneOf arr _ input _ _ = arr `alexSafeIndex` alexInputPrevChar input hunk ./templates/GenericTemplate.hs 224 --- used by wrappers -iUnbox IBOX(i) = i } Context: [Use configurations to allow to build with old ghc, but requires new cabal Duncan Coutts <duncan(a)haskell.org>**20070906183845 Also update Setup.lhs, again requires new cabal, but much simplified. ] [Install LICENSE in the correct place sven.panne(a)aedion.de**20070902120038] [Guess what? Fixed Cabal-induced breakage (in a totally wrong way) sven.panne(a)aedion.de**20070902114446 Tired of trying to find out how to do this correctly and backwards compatible, I've hardwired things to GHC and the Cabal-of-the-day. ] [We depend on array, containers and directory nowadays sven.panne(a)aedion.de**20070902114409] [Add category: Development to .cabal file Duncan Coutts <duncan(a)haskell.org>**20070831112158 Otherwise it appears on the hackage website in the "Unclassified" category. ] [Handle Cabal API changes regarding hooks sven.panne(a)aedion.de**20070623180848] [Manpage should call file location DATADIR rather than LIBDIR Ian Lynagh <igloo(a)earth.li>**20070622000203] [don't gobble up the first character of a code fragment Simon Marlow <simonmar(a)microsoft.com>**20070619095806] [Patch the Setup.lhs to work with the latest version of Cabal - things have changed to returning IO (), not IO ExitCode Neil Mitchell**20070613072344] [Typo spotted by Helmut Grohne: appriate -> appropriate Ian Lynagh <igloo(a)earth.li>**20070417122330] [fix for using generated code with !GHC Simon Marlow <simonmar(a)microsoft.com>**20070417075855] [Add new ByteString wrappers Duncan Coutts <duncan.coutts(a)worc.ox.ac.uk>**20070112120814 Wrappers for basic-bytestring, posn-bytestring and monad-bytestring Just like the ordinary ones but taking a lazy ByteString rather than a String as input. Required one change in the order in the generated code (in Main.hs), this is because the ByteString wrappers need to use an extra import which of course has to come at the top of the generated module, so we have to output the wrapper earlier than we did before. ] [add script for building the Windows dist Simon Marlow <simonmar(a)microsoft.com>**20070109134817] [move release notes into docs Simon Marlow <simonmar(a)microsoft.com>**20070108155312] [announce for 2.1.0 Simon Marlow <simonmar(a)microsoft.com>**20070108152640] [TAG 2.1.0 RC Simon Marlow <simonmar(a)microsoft.com>**20061024124241] Patch bundle hash: 188c4e2ccd02443cdd071510dee856ad6da8ad83

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Announcing: HsDNS Version 1.1 Available For Download
by Peter Simons 17 Jan '08

17 Jan '08

Hi, HsDNS provides an asynchronous DNS resolver on top of the GNU ADNS library. Not all options are supported, but A, MX, and PTR lookups work nicely. Courtesy of Lutz Donnerhacke <lutz(a)iks-jena.de>, the new 1.1 release adds support for retrieving generic RR types, CNAMEs, and for NSEC zone walking. The library's homepage is at <http://cryp.to/hsdns/>. Using "darcs get", the source code can be downloaded from the very same location. A Cabal release archive is also available at: http://cryp.to/hsdns/hsdns-1.1.tar.gz The software is released under the terms of the GNU Lesser General Public License. Best regards, Peter

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Re: Integrating editline with ghc
by Thorkil Naur 17 Jan '08

17 Jan '08

Hello, On Wednesday 16 January 2008 22:05, Judah Jacobson wrote: > Hi all, > > I have managed to build ghc using the initial release of the editline package: > > Hackage link: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/editline-0.1 > Haddock: http://code.haskell.org/editline/dist/doc/html/editline/ > > As I've mentioned before, there are two independent modules: > - System.Console.Editline is a very basic (and experimental) interface > to the native editline APIs. > - System.Console.Editline.Readline contains the readline APIs provided > by the editline library (mostly a cut/paste of > System.Console.Readline). Excellent! > > Currently I'm using just the latter as a drop-in replacement for > System.Console.Readline in ghci. I have added a --with-editline flag > to ghc's configure script, which has no effect if it's not specified, > and otherwise does the following: > > - Throw an error (at configure time) if editline isn't present (as > $hardtop/libraries/editline) That's the way. > - Use the editline package instead of readline when building ghc stage 2 > - Use CPP to make InteractiveUI.hs (the main ghci loop) import > System.Console.Editline.Readline instead of System.Console.Readline. > > Does that sound like the right way to handle this? If so, I'll send a > darcs patch. An alternative that would make the GHC configure script more symmetric with respect to command line editor would be to have --with-line-editor=editline, --with-line-editor=readline and also, perhaps, --with-line-editor=none (or even --with-line-editor=). All of these with, hopefully, obvious meanings. On top of this, one could have --with-edit-line=automatic with some automatic selection taking place. And the default? I'm sure that my favorite --with-line-editor=none will not be considered practical, so I will leave this most difficult choice to others. > > Also, should editline be made a boot-package or an extra-package (or neither)? > > Thanks, > -Judah > ... Thanks a lot again. Best regards Thorkil

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darcs patch: bugfix: allow multi-word token-type usin... (and 2 more)
by Isaac Dupree 16 Jan '08

16 Jan '08

Proposal: put Happy and Alex discussion/patches/etc under the libraries(a)haskell.org domain, even though they're not technically libraries. (their purpose is very similar to Parsec's, for example, which is a library; and GHC depends on them, though from the end-user's point of view it's not quite as strong a dependency as the boot-libs) This patch is bugfixes for Happy that I discovered when trying to make GHC's code more portable (so I was testing using happy without -agc for the first time) (I sent this first to cvs-ghc(a)haskell.org but I figured I should really ask the community anyway). (I have a more controversial topic/patch to propose for Alex and Happy later...) ~Isaac Thu Dec 27 07:57:38 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * bugfix: allow multi-word token-type using parentheses everywhere needed Thu Dec 27 11:54:46 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * refactor HappyReduction-generating code (no semantic change) Thu Dec 27 12:04:54 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * self-expand HappyReduction for more Haskell98 compliance It's not too bad at all since it's only duplicated in two places. Happy without -agc is most likely to be used by the compilers other than GHC anyway. Should I really put those comments into the output file, or is it better just to remove the references to the old type-synonym? To: cvs-ghc(a)haskell.org From: Isaac Dupree <id(a)isaac.cedarswampstudios.org> Subject: darcs patch: bugfix: allow multi-word token-type usin... (and 2 more) X-Mail-Originator: Darcs Version Control System X-Darcs-Version: 1.0.9 (release) DarcsURL: http://darcs.haskell.org/happy MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=_" --=_ Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Thu Dec 27 07:57:38 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * bugfix: allow multi-word token-type using parentheses everywhere needed Thu Dec 27 11:54:46 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * refactor HappyReduction-generating code (no semantic change) Thu Dec 27 12:04:54 EST 2007 Isaac Dupree <id(a)isaac.cedarswampstudios.org> * self-expand HappyReduction for more Haskell98 compliance It's not too bad at all since it's only duplicated in two places. Happy without -agc is most likely to be used by the compilers other than GHC anyway. Should I really put those comments into the output file, or is it better just to remove the references to the old type-synonym? --=_ Content-Type: text/x-darcs-patch; name="bugfix_-allow-multi_word-token_type-using-parentheses-everywhere-needed.dpatch" Content-Transfer-Encoding: quoted-printable Content-Description: A darcs patch for your repository! New patches: [bugfix: allow multi-word token-type using parentheses everywhere needed Isaac Dupree <id(a)isaac.cedarswampstudios.org>**20071227125738] { hunk ./src/ProduceCode.lhs 85 +> token =3D brack token_type hunk ./src/ProduceCode.lhs 148 -> . str "happyInTok :: " . str token_type . str " -> " . bhappy_item +> . str "happyInTok :: " . token . str " -> " . bhappy_item hunk ./src/ProduceCode.lhs 151 -> . str "happyOutTok :: " . bhappy_item . str " -> " . str token_type +> . str "happyOutTok :: " . bhappy_item . str " -> " . token hunk ./src/ProduceCode.lhs 177 -> . str "\n\t=3D HappyTerminal " . str token_type +> . str "\n\t=3D HappyTerminal " . token hunk ./src/ProduceCode.lhs 232 -> token =3D brack token_type hunk ./src/ProduceCode.lhs 707 -> . str token_type +> . token hunk ./src/ProduceCode.lhs 720 -> . str token_type . str " -> " = +> . token . str " -> " = } [refactor HappyReduction-generating code (no semantic change) Isaac Dupree <id(a)isaac.cedarswampstudios.org>**20071227165446] { hunk ./src/ProduceCode.lhs 201 -> str "type HappyReduction m =3D \n\t" -> . str " " -> . intMaybeHash -> . str " \n\t-> " . token -> . str "\n\t-> HappyState " -> . token -> . str " (HappyStk HappyAbsSyn -> " . tokens . result -> . str ")\n\t" -> . str "-> [HappyState " -> . token -> . str " (HappyStk HappyAbsSyn -> " . tokens . result -> . str ")] \n\t-> HappyStk HappyAbsSyn \n\t-> " -> . tokens -> . result -> . str "\n\n" +> happyReductionDefinition . str "\n\n" hunk ./src/ProduceCode.lhs 206 -> . intMaybeHash -> . str " -> HappyReduction (" . str monad_tycon . str ")\n\n" +> . intMaybeHash . str " -> " . happyReductionValue . str "\n\n" hunk ./src/ProduceCode.lhs 211 -> . str " :: " . str monad_context . str " =3D> HappyReduction (" . st= r monad_tycon . str ")\n\n" = +> . str " :: " . str monad_context . str " =3D> " +> . happyReductionValue . str "\n\n" hunk ./src/ProduceCode.lhs 222 -> result =3D (str "m HappyAbsSyn") +> happyReductionDefinition =3D +> str "type HappyReduction m =3D " +> . happyReduction (str "m") +> happyReductionValue =3D +> str "HappyReduction " +> . brack monad_tycon +> happyReduction m =3D +> str "\n\t " +> . intMaybeHash +> . str " \n\t-> " . token +> . str "\n\t-> HappyState " +> . token +> . str " (HappyStk HappyAbsSyn -> " . tokens . result +> . str ")\n\t" +> . str "-> [HappyState " +> . token +> . str " (HappyStk HappyAbsSyn -> " . tokens . result +> . str ")] \n\t-> HappyStk HappyAbsSyn \n\t-> " +> . tokens +> . result +> where result =3D m . str " HappyAbsSyn" } [self-expand HappyReduction for more Haskell98 compliance Isaac Dupree <id(a)isaac.cedarswampstudios.org>**20071227170454 It's not too bad at all since it's only duplicated in two places. Happy without -agc is most likely to be used by the compilers other than GHC anyway. Should I really put those comments into the output file, or is it better just to remove the references to the old type-synonym? ] { hunk ./src/ProduceCode.lhs 223 -> str "type HappyReduction m =3D " +> str "{- to allow type-synonyms as our monads (likely\n" +> . str " - with explicitly-specified bind and return)\n" +> . str " - in Haskell98, it seems that with\n" +> . str " - /type M a =3D .../, then /(HappyReduction M)/\n" +> . str " - is not allowed. But Happy is a\n" +> . str " - code-generator that can just substitute it.\n" +> . str "type HappyReduction m =3D " hunk ./src/ProduceCode.lhs 231 +> . str "\n-}" hunk ./src/ProduceCode.lhs 233 -> str "HappyReduction " +> str "({-" +> . str "HappyReduction " hunk ./src/ProduceCode.lhs 236 +> . str " =3D -}" +> . happyReduction (brack monad_tycon) +> . str ")" } Context: [update following recent Cabal changes Simon Marlow <simonmar(a)microsoft.com>**20071026150947] = [TAG 1.17 RELEASE Simon Marlow <simonmar(a)microsoft.com>**20071023145501] = Patch bundle hash: 7b85a9d0b16a315f2996831afcf214299b4bd4cb --=_-- .

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