May 2002 - Haskell - Haskell.org

tricky instance declarations
by Warrick Gray 03 May '02

03 May '02

Hi all, I'm not very current on the latest wonders of haskell typing, but I feel that something like the following should be possible: data ConnError = ... -- error propagating monad: instance Monad (Either ConnError) where (Left e) >>= _ = Left e (Right v) >>= f = f v return = Right -- combined IO & error propagating monads instance Monad (IO (Either ConnError a)) where -- (>>=) :: IO (Either ConnError a) -- -> (a -> IO (Either ConnError b)) -- -> IO (Either ConnError b) m >>= f = m >>= \e -> e >>= f return = return . return I know the first declaration works with GHC compiler flag "-fglasgow-exts", but something about the line "Monad (IO (Either ConnError a))" makes me (and the compiler) very nervous. How should I be expressing this? Yours expectantly, Warrick. _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx

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SAS'02 -- DEADLINE EXTENSION -- MAY 10
by SAS2002 03 May '02

03 May '02

(Apologies for multiple postings) Due to numerous requests, the submission deadline for SAS'02 has been extended to: **Friday MAY 10** ---------------------------------------------------------------------- CALL FOR PAPERS (SAS'02) The 9th International Static Analysis Symposium September 17 - 20 2002, Madrid, Spain http://clip.dia.fi.upm.es/SAS02 New submission deadline: May 10, 2002 ---------------------------------------------------------------------- Static Analysis is increasingly recognized as a fundamental tool for high performance implementations and verification systems of high-level programming languages. The series of Static Analysis Symposia has served as the primary venue for presentation of theoretical, practical, and application advances in the area. The Ninth International Static Analysis Symposium (SAS'02) will be held at the Technical University of Madrid, co-located with Logic-based Program Development and Transformation (LOPSTR'02) and the APPIA-GULP-PRODE Joint Conference on Declarative Programming (AGP'02). Previous symposia were held in Paris, Santa Barbara, Venice, Pisa, Paris, Aachen, Glasgow and Namur. The technical program for SAS'02 will consist of invited lectures, tutorials, panels, presentations of refereed papers, and software demonstrations. Contributions are welcome on all aspects of Static Analysis, including, but not limited to: * abstract interpretation, * data flow analysis, * verification systems, * program specialization, * abstract domains, * optimizing compilers, * theoretical frameworks, * type inference, * abstract model checking, * complexity analysis, * abstract testing, * security analysis. Submissions can address any programming paradigm, including concurrent, constraint, functional, imperative, logic and object-oriented programming. Survey papers that present some aspect of the above topics with a new coherence are also welcome. Papers must describe original work, be written and presented in English, and must not substantially overlap with papers that have been published or that are simultaneously submitted to a journal or a conference with refereed proceedings. Submission Instructions ----------------------- All submissions must be performed electronically at http://clip.dia.fi.upm.es/SAS02/submission.html. Submitted papers should be at most 15 pages excluding bibliography and well-marked appendices. Program committee members are not required to read the appendices, and thus papers should be intelligible without them. The proceedings will be published by Springer-Verlag in the Lecture Notes in Computer Science series (see http://www.springer.de/comp/lncs/authors.html for the LNCS author instructions). Thus, adhering to that style already in the submission is strongly encouraged. Papers should be submitted either in PostScript or PDF format and they should be interpretable by Ghostscript or Acrobat Reader. Papers must be printable on either A4 paper or US letter, and preferably on both. Important Dates --------------- May 10, 2002 Extended submission deadline (hard) June 10, 2002 Notification June 30, 2002 Final version Sept 17-20, 2002 SAS'02 Program Committee ----------------- Manuel Hermenegildo (Chair) Technical University of Madrid, Spain German Puebla (Co-chair) Technical University of Madrid, Spain Radhia Cousot Ecole Polytechnique, France Saumya Debray The University of Arizona, USA Manuel Fahndrich Microsoft Research, USA Roberto Giacobazzi Univerity of Verona, Italy Chris Hankin Imperial College, UK Giorgio Levi Univerity of Pisa, Italy Kim Marriott Monash University, Australia Alan Mycroft Cambridge University, United Kingdom Ganesan Ramalingam IBM T.J. Watson Research Center, USA Martin Rinard Massachusetts Institute of Technology, USA Shmuel Sagiv Tel-Aviv Univerisity, Israel Reinhard Wilhelm Universitat des Saarlandes, Germany Contact Info ------------ Email: sas02(a)clip.dia.fi.upm.es Fax: + 34 91 352 4819 Phone: + 34 91 336 7448 Post: Manuel Hermenegildo (Ref.: SAS'02) Facultad de Informatica Universidad Politecnica de Madrid 28660 Boadilla del Monte Madrid, Spain ----------------------------------------------------------------------

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(no subject)
by laurent mpeti kabila 02 May '02

02 May '02

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02 May '02

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RE: Haddock
by Simon Marlow 02 May '02

02 May '02

> I just tried haddock-0.1. Good thing! Two quibbles, though: > * the parser chokes on CVS headers like -- $Id ...$ > ( but -- -- $Id ..$ is OK) Yes, because '-- $' has a special meaning in Haddock (it's a named documentation comment). > * is there support for hierarchical namespaces? > ( with module Foo.Bar in file Foo/Bar.hs, and so on ) Yes, hierarchical modules are supported. You must pass the full filenames of each of the modules to be processed to Haddock, though. Cheers, Simon

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Haddock
by Johannes Waldmann 02 May '02

02 May '02

I just tried haddock-0.1. Good thing! Two quibbles, though: * the parser chokes on CVS headers like -- $Id ...$ ( but -- -- $Id ..$ is OK) * is there support for hierarchical namespaces? ( with module Foo.Bar in file Foo/Bar.hs, and so on ) Best regards, -- -- Johannes Waldmann ---- http://www.informatik.uni-leipzig.de/~joe/ -- -- joe(a)informatik.uni-leipzig.de -- phone/fax (+49) 341 9732 204/252 --

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e = exp 1
by Serge D. Mechveliani 02 May '02

02 May '02

I wrote about e :: Double for the Library. It can be obtained as exp 1, but I wonder whether it is good for the library to add the `e' denotation. ----------------- Serge Mechveliani mechvel(a)botik.ru

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e :: Double
by Serge D. Mechveliani 02 May '02

02 May '02

Please, has Haskell e :: Double ( ~= limit (1 + 1/n)^n ) in its standard library? ----------------- Serge Mechveliani mechvel(a)botik.ru

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finding sublist
by Serge D. Mechveliani 02 May '02

02 May '02

Thanks to people who helped me with the task >> Import two space separated columns of integers from file. Claus Reinke <claus.reinke(a)talk21.com> recommends to exploit `lines'. Indeed, it bocomes shorter now: main = readFile "data" >>= (putStr . show . twoIntLists) where twoIntLists str = case span (not . null) $ dropWhile null $ lines str of (lns, lns') -> (readInts lns, readInts lns') readInts = map (\ str -> read str :: Integer) . dropWhile null Another question: has the Haskell Standard library a function for such a usable task as finding of occurence of a segment in a list? Say findSegmentBy (...) [2,2,3] [0,0,2,2,1,2,2,3,1,2,3] --> ([0,0,2,2,1], [2,2,3,1,2,3]) I have heard, an efficient algorithm (for large lists) for this is not so simple. ----------------- Serge Mechveliani mechvel(a)botik.ru

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ANNOUNCE: Haddock version 0.1, a Haskell documentation tool
by Simon Marlow 01 May '02

01 May '02

I'm pleased to announce version 0.1 of Haddock, a documentation generation tool for Haskell source code. It's available from http://www.haskell.org/haddock/ Here's the README: Haddock, a Haskell Documentation Tool ===================================== This is Haddock, a tool for automatically generating documentation from annotated Haskell source code. It is primary intended for documenting libraries, but it should be useful for any kind of Haskell code. Like other systems ([1],[2]), Haddock lets you write documentation annotations next to the definitions of functions and types in the source code, in a syntax that is easy on the eye when writing the source code (no heavyweight mark-up). The documentation generated by Haddock is fully hyperlinked - click on a type name in a type signature to go straight to the definition, and documentation, for that type. Haddock understands Haskell's module system, so you can structure your code however you like without worrying that internal structure will be exposed in the generated documentation. For example, it is common to implement a library in several modules, but define the external API by having a single module which re-exports parts of these implementation modules. Using Haddock, you can still write documentation annotations next to the actual definitions of the functions and types in the library, but the documentation annotations from the implementation will be propagated to the external API when the documentation is generated. Abstract types and classes are handled correctly. In fact, even without any documentation annotations, Haddock can generate useful documentation from your source code. Haddock can generate documentation in multiple formats; currently HTML is implemented, and there is partial support for generating DocBook. The generated HTML uses stylesheets, so you need a fairly up-to-date browser to view it properly (Mozilla, Konqueror, Opera, and IE 6 should all be ok). Full documentation can be found in the doc/ subdirectory, in DocBook format. Please send questions and suggestions to me: Simon Marlow <simonmar(a)microsoft.com> [1] IDoc - A No Frills Haskell Interface Documentation System http://www.cse.unsw.edu.au/~chak/haskell/idoc/ [2] HDoc http://www.fmi.uni-passau.de/~groessli/hdoc/

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