Pike-devel September 2003

pike-devel@lists.lysator.liu.se

13 participants
60 discussions

generate pike code from uml?
by Martin Baehr 07 Sep '03

07 Sep '03

hi, a group of students here is working on a project that involves sTeam. they are using uml and they would like to generate pike code from it, has anything like this been attemted yet? greetings, martin.

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Language comparisions
by Martin Nilsson (ja till euro, nej till cent) ＠ Pike (-) developers forum 05 Sep '03

05 Sep '03

I have spent the day adding a Pike column to some more language comparisions on the net, and thought it wise to save some info on where Pike failed: Python and Perl has a three way (</=/>) comparision function "cmp". Should Pike have one, and where? Pliant has a four way (</=/>/not comparable) comparision function "compare". Should Pike that instead or at all? Should we make an eval function like most other languages. mixed eval(string x) { return compile_string("mixed foo(){ "+x+";}")()->foo(); } Should we have an identity function for the fun of it (Haskell has id and Smalltalk has yourself)? Should upper_case and lower_case be able to operate on integers (chars)? Should we add Array.shift and Array.pop to remove elements in either end of the Array? Should we add Array.zip and Array.unzip to merge and split arrays. Should we add Array.partition that splits an array into two (like filter with two outputs)? Should we add Array.exists/any to determine if at least one element satisfies a criterion and Array.every/all to determine if the all are? Should we add the possibility to define default values for types, e.g. typedef int myint = 7; Do we need a Math.divmod? Questions, questions...

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foreach problem
by Martin Stjernholm, Roxen IS ＠ Pike developers forum 05 Sep '03

05 Sep '03

I was bit yesterday by a bug/misfeature in foreach regarding iterators. After getting the index and/or value from the iterator, it increments it before executing the loop code. I.e. the following will throw an error: String.Iterator iter = String.Iterator ("foo"); foreach (iter; int idx;) if (idx != iter->index()) error ("wtf?\n"); I consider it a bug and intend to change foreach so that the iterator is incremented after the loop instead. Unfortunately that change can have nasty effects in code that expects foreach to behave like this. I can either change it in 7.5 only and fix some #pike 7.4 compatibility goo, or I can "ignore" the compat issue and fix it in both 7.4 and 7.5. I'm actually inclined to do the latter, under the assumption that there still is very little code that use iterators this way (Grubbas new compiler is the only example I know). If it stays as it is in 7.4 it can be cumbersome to update code to 7.5. Not sure though if we can get away with pulling a stunt like that this long after the 7.4 release. Does anyone know of more code that depends on this foreach quirk?

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Re: arrays in Java
by Mirar ＠ Pike developers forum 05 Sep '03

05 Sep '03

...while being too lazy to...

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arrays in Java
by Bill Welliver 05 Sep '03

05 Sep '03

I've been fiddling with the Java support lately, and it appears that while the Java bridge has no real documentation, it's pretty full featured. That said, I'm trying to get a feel for the limitations, and ran into one that just doesn't seem right: if I create a new java array of any type other than string, I can't assign values to it: example using string: import Java; object t=machine->find_class("java/lang/String"); object o=pkg["java/lang/reflect/Array"]->newInstance(t, 5); o[0]="foo"; o[1]="bar"; works just fine, but this example using integers doesnt: import Java; object t=machine->find_class("java/lang/Integer"); object o=pkg["java/lang/reflect/Array"]->newInstance(t, 5); o[0]=12; o[1]=5; incompatible types passed to method. jvm.c:3550: jvm.c:3550()->`[]=(0,1) /usr/local/pike/7.4.20/lib/modules/Java.pmod:301: Java.jarray()->`[]=(0,1) test.pike:7: test()->main() Any ideas? I had been using java the manual way by manually connecting methods, and it worked fine using Array.set() (admittedly a different technique). Thanks! Bill

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Java under FreeBSD
by Xavier Beaudouin 04 Sep '03

04 Sep '03

Hello, I am trying to make Java support under FreeBSD (mostly for some .jsp and some caudiumish things). When I trying to search for java, the autoconf file does that : ################################################### ## Configuring module: Java ## Installation dir: checking for C compiler default output... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for executable suffix... checking for object suffix... (cached) o checking whether we are using the GNU C compiler... (cached) yes checking whether /home/kiwi/xenoclient/pike-7.5/kiwi.isdnet.net/buildtmp/Pike7.5- 20030904-122007/build/freebsd-4.8-release-p3-i386/smartlink gcc accepts -g... (cached) yes checking if we are using TCC... (cached) no checking how to run the C preprocessor... gcc -E checking which operating system we are using... freebsd checking which architecture we are using... i386 checking what kind of threads to use... native_threads checking for working ls... /bin/ls checking for JAVA_HOME... /usr/local/jdk1.3.1/jre checking for Java libraries... /usr/local/jdk1.3.1/jre/lib/i386/classic /usr/local/jdk1.3.1/jre/lib/i386 Adding /usr/local/jdk1.3.1/jre/lib/i386/classic /usr/local/jdk1.3.1/jre/lib/i386 to the library search path. checking for the Java include directory... /usr/local/jdk1.3.1/jre/../include Adding /usr/local/jdk1.3.1/jre/../include to the include search path. Adding /usr/local/jdk1.3.1/jre/../include/freebsd to the include search path. checking for JavaVM (MacOS X)... no checking for jni.h... yes checking for winbase.h... (cached) no checking for setjmp.h... (cached) yes checking for sysOpen in -lhpi... no checking for JNI_CreateJavaVM in -ljvm... no checking for known machine language... x86 checking whether make sets ${MAKE}... (cached) yes checking for the Pike base directory... /home/kiwi/xenoclient/pike-7.5/kiwi.isdnet.net/buildtmp/Pike7.5- 20030904-122007/src updating cache ../.././config.cache configure: creating ./config.status config.status: creating make_variables config.status: creating Makefile config.status: creating module.pmod.in config.status: creating config.h configure: configuring in MIME configure: running /usr/local/bin/bash '/home/kiwi/xenoclient/pike-7.5/kiwi.isdnet.net/buildtmp/Pike7.5- 20030904-122007/src/modules/MIME/configure' --cache-file=../.././config.cache --srcdir=/home/kiwi/xenoclient/pike-7.5/kiwi.isdnet.net/buildtmp/ Pike7.5-20030904-122007/src/modules/MIME configure: loading cache ../.././config.cache But ... checking for JNI_CreateJavaVM in -ljvm... no Is the most interresting part, config.log says : configure:2450: checking for JNI_CreateJavaVM in -ljvm configure:2471: /home/kiwi/xenoclient/pike-7.5/kiwi.isdnet.net/buildtmp/Pike7.5- 20030904-122007/build/freebsd-4.8-release-p3-i386/smartlink gcc -o conftest -g -I/usr/local/include/pth -I/usr/local/jdk1.3.1/jre/../include/freebsd -I/usr/loc al/jdk1.3.1/jre/../include -I/usr/local/include -I/usr/X11R6/include -L/usr/loc al/jdk1.3.1/jre/lib/i386 -R/usr/local/jdk1.3.1/jre/lib/i386 -L/usr/local/jdk1.3. 1/jre/lib/i386/classic -R/usr/local/jdk1.3.1/jre/lib/i386/classic -g -O2 -pipe - I/usr/local/include/pth -L/usr/local/lib/pth conftest.c -ljvm -lm -lpthread -lc rypt >&5 /usr/local/jdk1.3.1/jre/lib/i386/classic/libjvm.so: undefined reference to `setFPMode' configure:2474: $? = 1 configure: failed program was: #line 2459 "configure" #include "confdefs.h" #include <jni.h> int main () { JNI_CreateJavaVM((JavaVM**)0,(void**)0,(void*)0); ; return 0; } configure:2500: result: no Now what it "sefFTPMode" and where does this thing comming from ? /Xavier

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Pike Conference 2003 - 2nd Announcement
by Martin Baehr 04 Sep '03

04 Sep '03

could a news item be added to the pike site with the announcement below? (the first paragraph with the new links could be used as the summary for the front page) Call for Participation and Contributions Pike Conference 2003 - Sep 25-27 Pike In Distributed Knowledge Environments http://pike.ida.liu.se/conferences/2003/ The Pike conference is only a few weeks away and it is time to register, you can do that now on the conference website: http://www.open-steam.org/conferences/pike2003/ http://www.open-steam.org/conferences/pike2003/registration Conference Information: ----------------------- The conference is being held on the 25th to the 27th of september. There is an extension to the 29th for Caudium specific topics. The conference is held at Paderborn University in Germany and with attendees coming from as far as Australia and New Zealand it is set to be a good one! After you have registered, you will be able update your registration details right up until the day of the event. If you have any further questions you may post them on the board inside the conference area after logging in. There will also be a FAQ available on the website in the next few days. Submissions: ------------ Please note that the date for submissions of talks, presentations or workshops has been changed and is now around the 18th of september. Pike: ----- This years conference is titled "Pike in Distributed Knowledge Environments" and we invite Pike programmers all over the world to meet in Paderborn, to discuss and present how Pike is used, what development has been done and what direction that development should take in the future. Caudium: -------- The Caudium extension is the first worldwide meeting of Caudium developers and users, and we invite all of you who wish to be involved in a brief catch-up with what has happened so far in the project, and help choose direction for the future of the project. Any participants of the Pike conference are welcome to join. Cost: ----- This years conference is being kindly sponsored by Paderborn University, however there is a cost to organising these events and a small, as yet undecided fee will be charged to all entrants. Rest assured that we will endeavour to keep it as low as possible. Thanks for your time and see you in Paderborn! for the conference team (www.open-steam.org), martin.

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Re: Language comparisions
by Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) ＠ Pike (-) developers forum 03 Sep '03

03 Sep '03

This is how you implement zip using zipWith in Haskell: Prelude> zipWith (\a b -> (a,b)) [1,3,5,7] [2,4,6,8] [(1,2),(3,4),(5,6),(7,8)] Prelude> (Actually, zip is defined as zip = zipWith (\a b -> (a,b)) which works due to curryficiation.)

1 0

[Conference] Accomodation
by Bertrand LUPART 02 Sep '03

02 Sep '03

Hey all, We didn't had all the answers we expected from Paderborn or german people about the youth hotel yet, but we think it's time for booking now. We are looking forward sleeping at the "Heiersburg" youth hotel located in Paderborn (http://www.jugendherberge.de/jh/paderborn/) - it's about 30 minutes walk from the conference place - it's cheap (17.5 EUR / night) - it could be nice to be many at the same place - it looks nice - it's not easy for non-native german people to look for accomodations in Paderborn :) So, here are the booking i'll do tonight at 23h00 (GMT+2), please correct me if wrong, and contact me if you want to get a room there too: * The hardcore Pike and Caudium conferencers, from the 25 to the 29 september (4 nights - arrival at Paderborn the 25 in the morning): - bill (Bill WELLIVER) - vida (David GOURDELIER) * The Caudium-only conferencers (ie the unlucky ones), from the 26 to the 29 september (3 nights - arrival at Paderborn the 26 late in the evening): - bertrand (Bertrand LUPART) - daffy (Olivier WARIN) - grendel (Marek HABERSACK) - kiwi (Xavier BEAUDOUIN) Not sure to come, yet: - barbiche (Frédéric RENAULT) - benoit (Benoit PLESSIS) -- Bertrand LUPART Linkeo.com - R&D | http://www.linkeo.com/ +33 1 72 71 71 82 | 17, rue de la Banque - F75002 Paris Systèmes de gestion d'email entrant | Email management systems

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Gentoo Linux ebuilds for pike-7.4.20 available
by Rainer Groesslinger 01 Sep '03

01 Sep '03

Hello guys, first, I am new to the list, just subscribed some hours ago. Well, I am also new to pike, I heard of pike for the first time yesterday but I have to admit that it looks really promising and I'll have a closer look at it ;) I have committed an ebuild for pike-7.4.20 to gentoo's portage tree. Gentoo users can install it just like every other ebuild, too. For reference, you can also take a look at it using our viewcvs: http://www.gentoo.org/cgi-bin/viewcvs.cgi/dev-lang/pike/ This is the initial commit of a pike ebuild so I'd be warmly interested in every sucess and failure story regarding the ebuild ;-) With your feedback I hope to steadily improve the pike ebuilds and get it into the stable tree quite soon. -- Rainer Groesslinger http://dev.gentoo.org/~scandium/

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Pike-devel September 2003