- Haskell - Haskell.org

Announce: APP: The Haskell Array Preprocessor
by Hal Daume III 13 Aug '02

13 Aug '02

Hi all...I'd read through the results of the survey and there seemed to be a sentiment that people tend to build their own "in-house" utilities and don't share them. I have a small one, but if anyone wants to use it, they're of course welcome. I have made it available at: http://www.isi.edu/~hdaume/APP/ With some documentation. The basic idea is to alleviate the pain of dealing with stateful arrays (IOArrays and STArrays, for the most part, but really anything that is an instance of MArray). APP basically builds some syntactic sugar on to Haskell for dealing with these and now allows constructions like: Read: z <- array[|x|][|y|] Assign: array[|x|][|y|] <- expr Update: array[|x|][|y|] <-$ expr Use: array[|x|][|y|] >>= print It's not perfect and makes some errors (but rarely), but it's very fast and the translations are very simple (and, imo, obvious). The exact translations can be found on the web page or in the source code which is distributed thereon. Happy Haskelling! - Hal

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RE: difference between (evaluate . runST) and stToIO
by Simon Marlow 13 Aug '02

13 Aug '02

> I can't seem to figure out what the difference is between using > > evaluate (runST action) > > and > > stToIO action > > when in the IO monad and running something in ST...they seem to behave > identically...are they? > > If they are, why do they have different type signatures (one is ST > RealWorld a -> IO a, while the other is (forall s. ST s a) -> IO a)? With stToIO, you can do this: do r <- stToIO newSTRef stToIO $ writeSTRef r 42 ... the types prevent you doing that with runST, but runST is safe to use in pure code whereas stToIO must be used in the IO monad. Cheers, Simon

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RE: Yet more text pedantry
by Simon Marlow 13 Aug '02

13 Aug '02

> tis 2002-08-13 klockan 11.57 skrev Simon Marlow: > > > Can't we make a mailing list for these issues? > > > > > > haskell-i18n(a)haskell.org is my proposal, who can create > such a list? > > > > I'll set up the list. Anyone wish to volunteer to moderate it? > > Does it have to be moderated? This will make things progress more > slowly. Not necessarily fully moderated, but there needs to be a list admin (haskell-i18n-admin(a)haskell.org) who is responsible for dealing with the messages that Mailman flags for auto-moderation, and user queries, etc. I'm already the admin for way too many lists on haskell.org, otherwise I'd volunteer myself :-) Cheers, Simon

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RE: Yet more text pedantry
by Martin Norbäck 13 Aug '02

13 Aug '02

tis 2002-08-13 klockan 11.57 skrev Simon Marlow: > > Can't we make a mailing list for these issues? > > > > haskell-i18n(a)haskell.org is my proposal, who can create such a list? > > I'll set up the list. Anyone wish to volunteer to moderate it? Does it have to be moderated? This will make things progress more slowly. Regards, Martin -- Martin Norbäck d95mback(a)dtek.chalmers.se Kapplandsgatan 40 +46 (0)708 26 33 60 S-414 78 GÖTEBORG http://www.dtek.chalmers.se/~d95mback/ SWEDEN OpenPGP ID: 3FA8580B

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InternetSeer Free Activation Confirmation
by Mike Dever 13 Aug '02

13 Aug '02

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RE: Yet more text pedantry
by Simon Marlow 13 Aug '02

13 Aug '02

> Can't we make a mailing list for these issues? > > haskell-i18n(a)haskell.org is my proposal, who can create such a list? I'll set up the list. Anyone wish to volunteer to moderate it? Simon

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Broken link on cvs.haskell.org
by Kathy Phillips 13 Aug '02

13 Aug '02

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ANNOUNCE: HaXml-1.06
by Malcolm Wallace 12 Aug '02

12 Aug '02

HaXml-1.06 ---------- http://www.haskell.org/HaXml/ We are pleased to announce a fresh release of HaXml, the collection of libraries and tools for using XML from Haskell. HaXml includes * a parser for XML; * a separate error-correcting parser for HTML; * an XML validator; * pretty-printers for XML and HTML; * a combinator library for generic XML document transformation, editing, and generation; * class Haskell2Xml which allows you to read and write ordinary Haskell data as XML; * DtdToHaskell, a tool for translating an XML DTD into equivalent Haskell types; * Xtract, a grep-like tool for XML documents. Release 1.06 is a major re-packaging of these facilities. Highlights include: * HaXml now uses the new hierarchical namespace for modules, specifically under the tree Text.Xml.HaXml. * The HaXml libraries now install as a separate `package' in both ghc and nhc98. Use -package HaXml to access them. * The library APIs are now documented using Haddock. * Due to popular request, we have added a new validator for checking generic document content against a DTD. This is available both as a library function, and as a command-line tool. * DrIFT is now distributed separately by John Meacham, with much better configuration and build support. You still only need it if you want to derive the Haskell2Xml class. * Bugfix: the lexer and parser now accept NOTATION declarations in the DTD. * Bugfix: a PublicId in a NOTATION decl is now correctly recognised by the keyword PUBLIC, not PUBLICID. * Bugfix: the HTML parser now correctly accepts stand-alone tags like IMG. * Bugfix: instances of XmlContent now accept an empty string where #PCDATA is expected. Likewise, comments, processing instructions, and character/entity references are now permitted to be scattered thoughout some #PCDATA text. * Bugfix: the OneOfN types used in code generated by DtdToHaskell are now supplied by default up to size 20, and a utility for automatically generating larger sizes is included. Regards, Malcolm

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Yet more text pedantry
by George Russell 12 Aug '02

12 Aug '02

Ketil wrote (quoting Ken) [snip] > > On most machines, Char will be a wrapper around Word8. (This > > contradicts the present language standard.) > > Can you point out any machine where this is not the case? One with a > Haskell implementation, or likely to have one in the future [snip] That's easy enough. On Sun/Solaris (which I use and which came out as being very popular on the Haskell survey) characters are SIGNED, so the values run from -128 to 127 and the wrapper would be not Word8 but Int8. I think this demonstrates the perils of saying "It's safe to assume everytning is 8 bit because everything is now". Although it is the case now that the overwhelming majority of computers use data sizes based on powers of 2, it is nothing other than speculation to say that this will always be the case.

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ANNOUNCE: hmake-3.06
by Malcolm Wallace 12 Aug '02

12 Aug '02

hmake-3.06 ---------- We are pleased to announce a fresh, bugfix, release of hmake, the Haskell compilation manager. The usual hmake highlights -------------------------- * hmake knows about interface (.hi) files. * hmake is compiler-independent, and allows multiple compiler versions. * hmake is aware of many pre-processors. * hmake can generate object files in a separate directory from your sources. * hmake understands the library package system. * hmake understands hierarchical module namespaces. * hmake understands the Hat tracer. What's new in 3.06 ------------------ * Better handling of package libraries. Previously, the package import directories were detected at installation time, so the addition of a new package required hmake-config to be invoked to update the config database. Also, because all of the package dirs were searched on every invocation, hmake could not warn of a missing -package flag. Now, package dirs are detected at runtime, and only for the requested packages - this fixes both problems. * Added the cmdline option list to hmake-config to display the set of Haskell compilers known to hmake. * Bugfix for the -hat option. Ensure that if a file goes through cpp before hat-trans, the resulting .hx file is moved from the temporary dir back to the build dir. * Bugfix, to ensure that hmake isn't confused by the escaped character \\ in a literal string. More info, and downloads ------------------------ http://www.cs.york.ac.uk/fp/hmake/ Regards, Malcolm Wallace

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