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Newbie Design Question
by Tanton Gibbs 05 Aug '03

05 Aug '03

Haskellers, I'm currently working on my first Haskell program. I really like the language so far, though it has been hard to break the OO frame of mind. Normally, I'm a C++/Perl programmer, but I have really enjoyed the type-safety of Haskell over Perl as well as the Hugs interpreter over a make cycle. Since execution time is not important, I haven't found any issues with using Hugs. Now, on to my problem. Our company uses XML to describe our processes. I'm writing a DSL in Haskell that will print that XML out. I've done most of it, but now I'm describing the I/O in the XML. Basically, we have files come in in various formats from various file contributors and we use a mapping program to map the fields to the right spots in the XML. So, for example, one contributor could have the following layout: Field Name Start Pos Length First Name, 1, 10 Last Name, 11, 10 and another contributor could have them in exactly the opposite order. Furthermore, some contributors may have fields that others don't (for example: DOB). I'm now trying to come up with a way to map this information into Haskell dynamically. It would be trivial to create a module for each Contributor and then import all the modules. However, we have hundreds of contributors and it would be a pain to have to change and re-release the program every time we added a new contributor. Therefore, I need someway to take this information and map it into my Haskell structures. I have come up with two options. One would be to let Haskell dynamically import a contributor module (but I don't think that is currently possible); the other would be to use a configuration file and have the user specify the information through it. Is there a standard Config file module? Is there any other way to do this that I missed? Thanks in advance, Tanton Gibbs, Ph.D. Technical Architect Abilitec Knowledge Base Acxiom Corporation Conway, AR 72034

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Persistent storage
by Nick Name 05 Aug '03

05 Aug '03

Is there someone who has implemented some limited form of persistency in haskell? I don't mean the longly-debated persistence of functional values, but something rough, like a persistent MVar with a thread saving modified values every n seconds or so. Vincenzo

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Parsec allocating a lot of memory
by Nick Name 04 Aug '03

04 Aug '03

Hi all, I am using "parsec" to parse the output from "xmame -listinfo" wich is a list of records of the form game ( attr1 value1 ... attrN valueN ) and for approx. 3500 records I got ~250 mb of RSS memory during parsing, wich takes 20 seconds on my athlon 1400. I think that I must have done something wrong (this is the first time I use parsec), here is my parser: --- Begin games = many game game = do openGame x <- manyTill attribute closeGame return (mkGameInfo x) attribute = do whitespaces x <- identifier whitespaces y <- tillEOL return (x,y) openGame = do string "game (" newline closeGame = do string ")" newline newline whitespace = "\v\f\t\r " whitespaces = skipMany (oneOf whitespace) tillEOL = manyTill anyChar newline identifier = many alphaNum --- End Thanks for any advice Vincenzo

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PROMOTION
by SANDER SMITH 04 Aug '03

04 Aug '03

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by webmaster 02 Aug '03

02 Aug '03

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by webmaster 02 Aug '03

02 Aug '03

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(no subject)
by Marcus D. Gabriel 01 Aug '03

01 Aug '03

-- Marcus D. Gabriel, Ph.D. Email: mdg(a)wanadoo.fr 213 ter, rue de Mulhouse F68300 Saint Louis FRANCE

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Re: a breaking monad (to haskell cafe)
by Iavor Diatchki 01 Aug '03

01 Aug '03

hi, Derek Elkins wrote: > Anyways, most of my uses of the Cont monad have been for my own personal > entertainment, and usually I break the abstraction (using > Control.Monad.Cont) to do the things I want. I don't know if I've ever > written something that's used callCC that I kept. except for entertainment purposes i feel pretty much the same way :-) i think that in probably 95% of the cases that arise there is a simpler monad that does the job (i.e. exceptions, backtracking, etc). of course it could be that we are simply not used to program using the callcc. bye iavor -- ================================================== | Iavor S. Diatchki, Ph.D. student | | Department of Computer Science and Engineering | | School of OGI at OHSU | | http://www.cse.ogi.edu/~diatchki | ==================================================

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FTP, XMLRPC libraries?
by Bryn Keller 01 Aug '03

01 Aug '03

Hi folks, I'm looking for FTP (client) and XMLRPC (client) libraries for Haskell. Does anyone know of any, or do I need to roll my own? Thanks, Bryn

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Exporting GHC functions.
by Thomas L. Bevan 31 Jul '03

31 Jul '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Here is a copy of all the files I am using to try to export a Haskell function. This compiles but produces a executable that simply hangs. Tom -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/KUHbYha8TWXIQwoRAs8RAKCIFcnH9uuqfMpDYXA0gfFjBtMfEwCgjZeD 5dkfLbz/lz4btmsR9G4kL2A= =pCBN -----END PGP SIGNATURE-----

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