November 2007 - Libraries

Data.IntSet bug
by Ian Lynagh 11 Nov '07

11 Nov '07

Hi all, Can someone familiar with Data.IntSet please look into http://hackage.haskell.org/trac/ghc/ticket/1762 wrong result of isProperSubsetOf IntSet.isProperSubsetOf (IntSet.fromList [2,3]) (IntSet.fromList [1,2,3]) is evaluated to False, but should be True. Thanks Ian

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Bug/infelicity with System.Locale.iso8601DateFormat
by Jon Fairbairn 09 Nov '07

09 Nov '07

According to <http://www.w3.org/TR/NOTE-datetime> (and other random sources), the iso format for date+time in one field is YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00), ie no spaces around the "T" but iso8601DateFormat outputs a space after the day if the timeFmt is not Nothing, so formatTime System.Locale.defaultTimeLocale (System.Locale.iso8601DateFormat (Just "T%H:%M:%SZ")) (UTCTime (fromGregorian 2007 10 20) 26540) yeilds "2007-10-20 T07:22:20Z". I reckon this is a bug, but at the very least it's not a good design. Please can we change Just fmt -> ' ' : fmt to Just fmt -> fmt ? if someone wants a space, they can put it in the string, but it's a pain to take it out when you want the one field format with a T there. -- Jón Fairbairn Jon.Fairbairn(a)cl.cam.ac.uk

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Space handling with Parsec
by Anakreon Mendis 08 Nov '07

08 Nov '07

I hope this is the correct mailing list do address parsec related questions. There is a question about parsec which I hope you could help. According to the documentation space parser recognizes '\n' as a space character. I am implementing a Basic parser where newline is important. For example, now the parser accepts the expression: a = 1 + 2 as equivalent to "a= 1 + 2" when it shouldn't. If this was the only problem, it wouldn't be a big deal. However, in basic, a function call is not required to enclose the arguments with parenthesis. Thus, the expressions: myFunc anOtherFunc arg1, arg2 are valid. Since the newline is skipped, when the parser tries to match the optional arguments of myFunc, it will search them in the line below. The parser will consume characters and will fail. What I tried to do is: imported the Parsec module, hiding the `space`. Reimplemented the space parser as space = oneOf [' ', '\t'] The parser behaved the same. Afterwords, I implemented the whiteSpace parser as whiteSpace = skipMany space This didn't work either.

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[Fwd: Re: readline]
by Simon Marlow 05 Nov '07

05 Nov '07

Forwarding on behalf of alpheccar <alpheccar(a)gmail.com>

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System.FilePath.joinDrive problem
by Twan van Laarhoven 04 Nov '07

04 Nov '07

Hello all, The joinDrive function currently produces paths such as "C:File" when calling "C:" </> "File". This is apparently handled in a special case: > | otherwise = case a of > [a1,':'] | isLetter a1 -> a ++ b > _ -> a ++ [pathSeparator] ++ b This seems wrong, as far as I know "C:File" is not a valid path. What is the reason for this special case? In particular this problem results in cabal wanting to install packages to "E:Haskell" on my computer (unless I pass a --prefix flag). Twan

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base split in GHC 6.8.1
by Ross Paterson 04 Nov '07

04 Nov '07

The following library packages on HackageDB fail with missing modules under GHC 6.8.1, usually due to the base split: bencode gd IFS pqc bktrees harpy Imlib Ranged-sets bzlib haskelldb lazysmallcheck regex-base classify HaXml libxml safecopy clevercss HCL ListLike Shellac dataenc HDBC LRU sparsecheck derive hgal metaplug StrategyLib dsp hinotify mime-string strict encoding hmarkup MonadRandom suffixtree Etherbunny hsemail numeric-quest syb-with-class fastcgi HsOpenSSL pandoc template FileManip hsql parsedate uniplate funcmp hsSqlite3 pcap vty functorm hxt plugins zlib

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bug in System.FilePath.isRelative ?
by Bulat Ziganshin 04 Nov '07

04 Nov '07

Hello libraries, system - win32. *FilePath> isRelative "c:file" False this path should be considered as relative, afaik -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com

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