Poly/ML

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698 discussions

Apparent bug in String.tokenize
by byron.hale＠einfo.com 10 Sep '03

10 Sep '03

Hi all, Please forgive the previous posting without data. I've been doing some get-out-the-vote work in California's famous democratic election, still scheduled for October 7th. As part of this work I have been using PolyML to tokenize voter record strings. I thought that we could not only surpass Florida, but even Canada's overnight hand counted vote. However, I am beginning to have my doubts. To my shock, some tokenizations from repeated token separators dropped fields which I believe should have resulted in empty strings. Are my expectations reasonable, or have I subtly misinterpreted the use of String.tokenize? Note that the field that would convey whether Miss Maxwell's male counterpart was a Sr, Jr, II, III, XIV, etc, has been dropped, making the results unsuitable for reading into an RDBMS, for example. Also, at the end, following the token "General," is the token "\n," when I believe there should be several empty strings inbetween. Thanks, Byron Hale Sample input/output follows, with data altered to protect the voter. (This time with data.:) val voter = "Miss\tMaxwell\tMaria\tElaine\t\t2323 Fremont St \tSanta Clara\tCA\t95050\t2323 Fremont St \tSanta Clara CA 95050\t(408)555-3323\tGeneral\t\t\t\t\t\t\n"; String.tokens(fn ch => (#"\t" = ch)) voter; val it = ["Miss", "Maxwell", "Maria", "Elaine", "2323 Fremont St ", "Santa Clara", "CA", "95050", "2323 Fremont St ", "Santa Clara CA 95050", "(408)555-3323", "General", "\n"] : String.string list

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Apparent bug in String.tokenize
by byron.hale＠einfo.com 10 Sep '03

10 Sep '03

Hi all, I've been doing some get-out-the-vote work in California's famous democratic election, still scheduled for October 7th. As part of this work I have been using using PolyML to tokenize voter record strings. I thought that we could not only surpass Florida, but even Canada's overnight hand counted vote. However, I am beginning to have my doubts. To my shock, some tokenizations from repeated token separators dropped fields which I believe should have resulted in empty strings. Are my expectations reasonable, or have I subtly misinterpreted the use of String.tokenize? Thanks, Byron Hale Sample input/output follows, with data altered to protect the voter.

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Disabling "Warning - Increasing stack" message
by David.Aspinall＠ed.ac.uk 03 Sep '03

03 Sep '03

I'm communicating with a PolyML program over stdin/stdout, and the "Increasing stack" messages were gettiong in the way. They are currently sent on stdout, but I believe they should be sent to stderr (or there should be the possibility of switching off warning messages altogether). Thanks to PolyML being open source, it was easy to make a small patch to processes.c in the driver to achieve output on stderr. David Matthews suggested I post it here in case it is of interest to others. I hope the patch may be integrated (or improved upon) in a later release. - David Aspinall. [da@montague driver]$ diff -c processes.c~ processes.c *** processes.c~ 2001-11-05 11:16:33.000000000 +0000 --- processes.c 2003-09-01 23:33:44.000000000 +0100 *************** *** 503,511 **** if (new_len >= (1 << 16)) { ! proper_printf("Warning - Increasing stack from %d to %d bytes\n", old_len * sizeof(word), new_len * sizeof(word)); ! proper_fflush(stdout); } /* Must make a new frame and copy the data over. */ --- 503,511 ---- if (new_len >= (1 << 16)) { ! proper_fprintf(stderr,"Warning - Increasing stack from %d to %d bytes\n", old_len * sizeof(word), new_len * sizeof(word)); ! proper_fflush(stderr); } /* Must make a new frame and copy the data over. */ -- David Aspinall <David.Aspinall(a)ed.ac.uk> School of Informatics, University of Edinburgh

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quick help -- load binaries
by neuper＠ist.tugraz.at 26 Aug '03

26 Aug '03

Just having switched from sml-nj to polyml we would need the Poly/ML equivalents of SMLofNJ.exportML"myBinary"; sml @SMLload=myBinary Anyone with a quick help ? We find http://www.polyml.org/docs/poly/intro.html very helpful (but we couldn't find the answer to our question ??), and we are not yet familiar enough with the basis library. Thanks, Walther -- ------------------------------------------------------------------------ Walther Neuper Mailto: neuper(a)ist.tugraz.at Institute for Software Technology Tel: +43-(0)316/873-5728 TUG University of Technology, Fax: +43-(0)316/873-5706 and HTL Ortweinschule, Graz, Austria Home: www.ist.tugraz.at/neuper ------------------------------------------------------------------------ -- ------------------------------------------------------------------------ Walther Neuper Mailto: neuper(a)ist.tugraz.at Institute for Software Technology Tel: +43-(0)316/873-5728 TUG University of Technology, Fax: +43-(0)316/873-5706 and HTL Ortweinschule, Graz, Austria Home: www.ist.tugraz.at/neuper ------------------------------------------------------------------------

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Joint IFL/TFP 2003 Call For Papers, Edinburgh, September 2003
by stg＠inf.ed.ac.uk 23 May '03

23 May '03

[Apologies for multiple copies of this message.] Joint IFL/TFP 2003 Call For Papers Between 8th and 12th September 2003 the - 15th Int. Workshop on the Implementation of Functional Languages http://www.macs.hw.ac.uk/~ifl03 - 4th Int. Symposium on Trends in Functional Programming http://homepages.inf.ed.ac.uk/stg/workshops/TFP/ will be co-located in Edinburgh Both calls for papers are appended below. ============================================================= IFL 2003 15th International Workshop on the IMPLEMENTATION OF FUNCTIONAL LANGUAGES Edinburgh Scotland September 8th - 10th, 2003 http://www.macs.hw.ac.uk/~ifl03 ============================================================= Important dates --------------- Registration deadline: August 1st, 2003 Submission deadline : August 22nd, 2003 Workshop : September 8-10th, 2003 ============================================================= Scope of IFL 2003 ----------------- The aim of the workshop is to bring together researchers and users actively engaged in the implementation and application of functional programming languages to discuss results and new directions of research. The workshop is intended to provide an open forum for researchers who wish to present and discuss new ideas and concepts, work in progress, preliminary results etc. related primarily but not exclusively to the implementation of functional or function-based languages. A not necessarily exhaustive list of topics includes language concepts type checking compilation techniques (abstract) interpretation automatic program generation (abstract) machine architectures array processing concurrent/parallel programming and program execution heap management runtime profiling and performance measurements debugging and tracing verification of functional programs tools and programming techniques Contributions on applications of functional programming, e.g., in teaching, or on theoretical work in any of the above areas are also welcome. This year's workshop is co-located with the 4th International Symposium on Trends in Functional Programming (TFP'03) <http://homepages.inf.ed.ac.uk/stg/workshops/ISTFP/>. Contributions ------------- All attendees are encouraged to submit papers to be published in the draft proceedings and to give presentations at the workshop. Submitted papers must be written in English, conform to the LNCS format (available at: http://www.springer.de/comp/authors/index.html) and not exceed 16 pages. Papers should be submitted by August 22nd as postscript or pdf files using the submission page of the workshop accessible through http://www.macs.hw.ac.uk/~ifl03 After the workshop, a high-quality subset of contributions will be published in the Springer LNCS series. All speakers attending the workshop are invited to submit a paper. Papers for the LNCS proceedings will be refereed according to normal conference standards. Greg Michaelson and Phil Trinder (Organizing Committee Chairs) School of Mathematical and Computer Sciences Heriot-Watt University Edinburgh, EH14 4AS E-mail: {greg,trinder}(a)macs.hw.ac.uk Teleph: +44 (0)131 451 3435 Depart: +44 (0)131 451 3328 Fasmly: +44 (0)131 451 3327 Intrnt: http://www.macs.hw.ac.uk/~greg http://www.macs.hw.ac.uk/~trinder ============================================================ TFP 2003 Fourth International symposium on Trends in Functional Programming Edinburgh, Scotland September 11th - 12th, 2003 http://homepages.inf.ed.ac.uk/stg/workshops/TFP/ The international symposium on Trends in Functional Programming continues the Scottish Functional Programming Workshop series. These workshops bring together researchers with interests in all aspects of functional programming languages. Papers on all aspects of functional programming are welcomed, be they implementation-oriented, theoretical, or experience papers. This year's workshop is co-located with the 15th International Workshop on the Implementation of Functional Languages (IFL '03) <http://www.macs.hw.ac.uk/~ifl03>. Workshop Topics Papers on any aspect of functional programming are welcome. Papers on the following subject areas are particularly welcome. * rich type systems, including type systems for expressing resource bounds or other safety properties; * linear type systems, soft type systems, typeful programming; * reasoning about functional programs, semantics of functional languages; * inductive or co-inductive techniques, proof nets; * mobile-code functional programming languages; * parallel programming with functional languages, cost models for functional programs; * compilation of functional languages for the Java Virtual Machine; * functional aspects of imperative programming, functional bytecode; * interoperability with imperative programming languages, calling imperative from functional or vice versa; * type inference algorithms, type error repair, deep types; * strongly-typed imperative languages with inference (e.g. Cyclone); * performance measurements, optimisation techniques, implementation techniques; * experience papers: applications of functional programming or functional programming in education. The above list is not exhaustive. Papers on other topics are also welcome. Contributions All attendees are encouraged to submit papers to be published in the draft proceedings and to give presentations at the workshop. Submitted papers must be written in English and not exceed 16 pages. Papers should be submitted as postscript (or pdf) by email to the workshop chair, Stephen Gilmore <stg(a)inf.ed.ac.uk>. Proceedings We intend to publish a high-quality subset of contributions in a highly-regarded series. All speakers attending the workshop are invited to submit a paper. Papers for the proceedings will be refereed according to normal conference standards. This implies (among other things) that: * the paper should be written in English * the paper is well written * topic of the paper should be stated clearly * the approach to solve the problem should be outlined clearly * a detailed discussion of the solution has to be given * the solution is compared with relevant related work * there is an abstract, introduction and conclusion. * the conclusion should summarise the problem, the solution, and how this solves the problem. * the paper should not exceed 16 pages. * the paper should be submitted as postscript (or pdf) by email to the workshop chair, Stephen Gilmore <stg(a)inf.ed.ac.uk>. Dates Aug 2nd 2003 : Submission for draft proceedings Sept 11th - Sept 12th 2003 : Workshop Oct 31st 2003 : Submission for referees process Dec 12th 2003 : Notification of acceptance/rejection Jan 23rd 2004 : Camera-ready papers Event Site The workshop will take place at The Pollock Halls in the city center of Edinburgh <http://www.accom.ed.ac.uk/maps/pollock.htm>. Previous workshops The TFP workshop continues the Scottish Functional Programming Workshop series. The previous SFPW meetings were Stirling (2001), St. Andrews (2000), Stirling (1999). Program Committee (provisional) Sharon Curtis <http://wwwcms.brookes.ac.uk/~p0073860/> Oxford Brookes University Stephen Gilmore (Chair) <http://homepages.inf.ed.ac.uk/stg/> The University of Edinburgh Kevin Hammond <http://www.dcs.st-and.ac.uk/~kh/> University of St Andrews Hans-Wolfgang Loidl <http://www.tcs.informatik.uni-muenchen.de/~hwloidl/> Ludwig-Maximilians-Universitat, Munchen Bruce McAdam <http://www.scms.rgu.ac.uk/staff/bjm/> Robert Gordon University Greg Michaelson <http://www.cee.hw.ac.uk/~greg/> Heriot-Watt University John O'Donnell <http://www.dcs.gla.ac.uk/~jtod/> University of Glasgow Phil Trinder <http://www.cee.hw.ac.uk/~trinder/> Heriot-Watt University -- Stephen Gilmore Laboratory for Foundations of Computer Science The University of Edinburgh Edinburgh EH9 3JZ Scotland

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Closing Motif Shell Windows
by rda＠lemma-one.com 11 Feb '03

11 Feb '03

Dear All, I have a Poly/ML Motif-based tool that is intended to be run from inside an interactive Poly/ML session. If you just take the defaults, when you use the window manager to close the shell window for the tool, the default value of XmDELETE for the deleteResponse resource on the shell widget means that the process gets killed, and the process in question is the Poly/ML session and that's not what I want. What I want to do is to tidy up without killing the interactive session so that the tool can be restarted in the same session if the user wants to. I have a quit callback which does this tidy up when you press a quit pushbutton in the tool. The C code to do this looks like this: XtVaSetValues(shell, XmNdeleteResponse, XmDO_NOTHING, NULL); WM_DELETE_WINDOW = XmInternAtom(XtDisplay(shell), "WM_DELETE_WINDOW", False); XmAddWMProtocolCallback(shell, WM_DELETE_WINDOW, quit, shell); Unfortunately, XmAddWMProtocolCallback and XmInternAtom aren't supported in the Poly/ML Motif structure. The Xlib interfaces you need to set up the WM protocols and handle client message events from the window manager are also not all provided. I'm currently using the following work-around. I set the deleteResponse resource on the shell widget to XmUNMAP then arrange for the function that starts the tool to attempt to map it again. If this fails, then the tool was killed by the quit pushbutton and I rebuild the widget hierarchy. Luckily, this gives the functionality I want, but it does mean that the window manager close differs from the quit pushbutton in not freeing the client and server memory and other resources occupied by the tool. Also, my quit callback is only able to destroy the widget hierarchy, since the interface hides application contexts behind the scenes. Does XtDestroyWidget cause the application context to be destroyed if you destroy the shell widget? I couldn't see any calls to XtDestroyApplicationContext in the driver code - so presumably I have a small memory leak with things as they are. Is there a better way with the existing Motif and X support? If not, is there a simple recipe for adding in extra Motif and X library functions? Regards, Rob.

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Comparison bug in LargeWord
by richards＠CS.Princeton.EDU 23 Jan '03

23 Jan '03

LargeWord's <, >, <=, and >= operators seem to be doing signed comparisons, contrary to their intended behavior (and the behavior of LargeWord.compare). A transcript follows -- note the last line: Poly/ML RTS version I386-4.1.3 (13:57:33 Sep 30 2002) Copyright (c) 2002 CUTS and contributors. Running with heap parameters (h=10240K,ib=2048K,ip=100%,mb=6144K,mp=20%) Mapping /u/richards/local/i386/lib/poly/ML_dbase Poly/ML 4.1.3 Release > LargeWord.compare(0w1, 0wx7FFFFFFF); val it = LESS : General.order > LargeWord.<=(0w1,0wx7FFFFFFF); val it = true : bool > LargeWord.compare(0w1, 0wx80000000); val it = LESS : General.order > LargeWord.<=(0w1,0wx80000000); val it = false : bool -- Chris

4 4

Handling Interrupts
by Frank Pfenning 31 Dec '02

31 Dec '02

Along similar lines: I have a Twelf top-level function in server that should interrupt the current computation and return to the Twelf top-level, not to an ML debugger or the ML top-level. I saw the documentation on signals, but I don't see how to achieve the desired effect because the handler will be run in a different thread. Any advice or help would be appreciated. - Frank

3 5

Poly/ML -- Exporting stand-alone applications
by Frank Pfenning 20 Dec '02

20 Dec '02

I have ported the Twelf logical framework implementation from SML/NJ to Poly/ML. The changes were significant, because Twelf was not SML'97 standards compliant as far as its uses of module features are concerned. The only other change had to do with the absence of a Word32 structure in Poly/ML. Now I would like to export a standalone Twelf server. Usually, this is run as an inferior process to Emacs and should not carry the ML compiler, for example. The FAQ gives a method to achieve this (sort of) using PolyML.onEntry. Has there been any progress on making it possible to export stand-along executables? Thanks, - Frank ---------------------------------------------------------------------- Frank Pfenning Phone: +1 412 268-6343 Department of Computer Science Fax: +1 412 268-3608 Carnegie Mellon University Email: fp(a)cs.cmu.edu Pittsburgh, PA 15213-3891, U.S.A. URL: http://www.cs.cmu.edu/~fp/ ----------------------------------------------------------------------

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Re: basis/Net* and basis/*Sock* modules (polyml digest, Vol 1 #26)
by jeremy＠discus.anu.edu.au 26 Nov '02

26 Nov '02

Another question: are the basis/Net* and basis/*Sock* modules documented anywhere? I have a version of the Basis document dated August 5, 1997 by Jonh Reppy. Has it been amended since? If yes, where can I get the current version? http://sml.sourceforge.net/Basis/ Jeremy

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