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From: Ken A. <kan...@bb...> - 2003-03-04 22:23:41
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I don't believe anyone has yet, though it has been suggested. If you know how to do Eclipse plugin's maybe we can wipe up something together. I have not tried Eclipse yet. k At 01:27 PM 3/4/2003 -0800, Boris Tschirschwitz wrote: >Hello and sorry for polluting your inbox. > >Do you know if anyone has written an eclipse plugin for jscheme, yet. >Sorry, I ask b/c I'd like to use one, not write one. > >Thanks, >Boris. |
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From: Timothy H. <tim...@ma...> - 2003-03-04 22:42:53
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On Tuesday, March 4, 2003, at 05:23 PM, Ken Anderson wrote: > I don't believe anyone has yet, though it has been suggested. > If you know how to do Eclipse plugin's maybe we can wipe up something > together. I have not tried Eclipse yet. I've forwarded this to someone in my group that works with Eclipse. He might have a plug-in for Eclipse already... I let you know what he says. ---Tim--- > > k > At 01:27 PM 3/4/2003 -0800, Boris Tschirschwitz wrote: >> Hello and sorry for polluting your inbox. >> >> Do you know if anyone has written an eclipse plugin for jscheme, yet. >> Sorry, I ask b/c I'd like to use one, not write one. >> >> Thanks, >> Boris. > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Etnus, makers of TotalView, The > debugger > for complex code. Debugging C/C++ programs can leave you feeling lost > and > disoriented. TotalView can help you find your way. Available on major > UNIX > and Linux platforms. Try it free. www.etnus.com > _______________________________________________ > Jscheme-user mailing list > Jsc...@li... > https://lists.sourceforge.net/lists/listinfo/jscheme-user > |
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From: Boris T. <bo...@ma...> - 2003-03-09 05:55:46
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Hi. Assuming that my ignorance mostly stems from not having studied jscheme long enough, I checked the list archives for answers, but I couldn't find anything and the sf system seems to be really terrible. I am wondering about the following: If I want to program using classes and objects, do I have to make all my structures Java classes, objects, ...? I wonder if this might restrict me in manipulating these objects in the scheme way. Yes, this sounds very vague, b/c I am not absolutely sure what I am asking and hope that someone on the list might understand it better than I do. Would it be beneficial to use something like Meroon? Boris. |
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From: Timothy H. <tim...@ma...> - 2003-03-09 22:48:19
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Hi Boris,
On Sunday, March 9, 2003, at 12:55 AM, Boris Tschirschwitz wrote:
> Hi.
>
> Assuming that my ignorance mostly stems from not having studied jscheme
> long enough, I checked the list archives for answers,
Thanks for checking first!
> but I couldn't find
> anything and the sf system seems to be really terrible.
What made it so horrible? Response time, organization,...?
>
> I am wondering about the following: If I want to program using classes
> and
> objects, do I have to make all my structures Java classes, objects, ...?
> I wonder if this might restrict me in manipulating these objects in the
> scheme way. Yes, this sounds very vague, b/c I am not absolutely sure
> what
> I am asking and hope that someone on the list might understand it better
> than I do.
You should look at the webpage:
http://jscheme.sourceforge.net/jscheme/src/dclass/dclass.html
which describes several approaches for working with Java classes from
Jscheme.
In summary, the main approaches we've tried are:
* don't define any new classes (i.e. use Java as a library language),
e.g. see the jlib/Swing.scm library
* when this doesn't work, define a wrapper class that allows you to
dynamically
assign functionality to a Java class from Jscheme (e.g. see the
jlib/SchemeCanvas.java class)
* for an interface you can use the Proxy class to implement that
interface at runtime in Jscheme
* for a non-interface, you can use the dclass package to define Java
classes in Scheme
and compile them to Java, e.g. the weblink above gives an example of
defining a class
"Compare" in a package "frog". This example is in dclass/test.scm,
reproduced below:
>
> (define-class
> (package frog)
> (import java.util.Comparator)
> (public class Compare implements Comparator)
> ;; Design issue, fields must be public for Jscheme code to access.
>
> (public Procedure predicate)
>
> (public Compare (Procedure predicate)
> (.predicate$ this predicate))
>
> (public boolean predicate (Object a Object b)
> ((.predicate$ this) a b))
>
> (public int compare (Object a Object b)
> (cond ((.predicate this a b) -1)
> ((.predicate this b a) 1)
> (else 0)))
>
> (public boolean equals (Object that)
> (and (eq? (.getClass this) (.getClass that))
> (eq? (.predicate$ this) (.predicate$ that))))
>
> (public int hashCode () 0))
>
>
The following script shows how to run that example:
> % java -cp lib/jscheme.jar:src jscheme.REPL
Note: we have to add a folder "src" to the classpath as dclass will
compile all new classes into
this folder..
>
>
> Jscheme 6.1.0 3/7/2003 http://jscheme.sourceforge.net
>
>
> > (load "elf/basic.scm")
> #t
> > (load "dclass/dclass.scm")
> #t
At this point we have loaded in the dclass compiler...
we are now ready to compile a new class, we could do this interactively
by making a call to > (define-class (package-frog) ....)
But that can be error-prone...., so we load it in from a file....
> > (load "dclass/test.scm")
; the compiler echoes the generated code to the console as well as to
the file
> Writing Java code for frog.Compare to
> /Users/tim/Research/Software/jscheme/src/frog/Compare.java
> // Generated by Jscheme by tim on Sun Mar 09 04:16:20 EST 2003
> package frog;
> import java.util.Comparator;
> import jsint.Procedure;
> import jscheme.JS;
> public class Compare implements Comparator { public Procedure predicate;
> public Compare(Procedure predicate) { JS.call(DCLASS_C_Compare0, this,
> predicate);
> }
> private static final Procedure DCLASS_C_Compare0 =(Procedure)
> JS.eval("(lambda (this predicate) (.predicate$ this predicate))");
> public boolean predicate(Object a, Object b) { return
> JS.booleanValue(JS.call(DCLASS_M_I_predicate1, this, a, b));
> }
> private static final Procedure DCLASS_M_I_predicate1 =(Procedure)
> JS.eval("(lambda (this a b) ((.predicate$ this) a b))");
> public int compare(Object a, Object b) { return
> JS.intValue(JS.call(DCLASS_M_I_compare2, this, a, b));
> }
> private static final Procedure DCLASS_M_I_compare2 =(Procedure)
> JS.eval("(lambda (this a b) (cond ((.predicate this a b) -1)
> ((.predicate this b a) 1) (else 0)))");
> public boolean equals(Object that) { return
> JS.booleanValue(JS.call(DCLASS_M_I_equals3, this, that));
> }
> private static final Procedure DCLASS_M_I_equals3 =(Procedure)
> JS.eval("(lambda (this that) (and (eq? (.getClass this) (.getClass
> that)) (eq? (.predicate$ this) (.predicate$ that))))");
> public int hashCode() { return
> JS.intValue(JS.call(DCLASS_M_I_hashCode4, this));
> }
> private static final Procedure DCLASS_M_I_hashCode4 =(Procedure)
> JS.eval("(lambda (this) 0)");
> }
> Compiling Java code for frog.Compare
and it compiles the new code to src/from/Compare.class where it is
immediately available to us
> #t
>
Next we use it to sort two arrays.... using two different comparators c1
and c2
> > (define c (frog.Compare. <))
> frog.Compare@0
> > (define arr #(1 4 2 5 6 79 3 4 8 5 3))
> #(1 4 2 5 6 79 3 4 8 5 3)
> > (Arrays.sort arr c)
> #null
> > arr
> #(1 2 3 3 4 4 5 5 6 8 79)
>
> > (define c2 (frog.Compare. (lambda(x y) (or (< (first x) (first y)) (>
> (second x) (second y))))))
.... this is a wierd sorting predicate, you can have A<B and B<A for
certain lists A,B, e.g. (1 5) and (4 6)
> frog.Compare@0
> > (define arr2 #((1 5) (4 3) (4 6) (5 3) (1 3) (1 6) (5 3) (5 4)))
> #((1 5) (4 3) (4 6) (5 3) (1 3) (1 6) (5 3) (5 4))
> > (Arrays.sort arr2 c2)
> #null
> > arr2
> #((1 6) (1 5) (4 6) (1 3) (4 3) (5 4) (5 3) (5 3))
>
> > (exit)
> #t
> %
>
I hope this starts to answer your question...
> Would it be beneficial to use something like Meroon?
Perhaps, but then you may have to worry about interacting with two object
systems, Java's and Meroon's. I haven't tried to get Meroon working in
Jscheme and it might be interesting!
Best,
---Tim---
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From: Boris T. <bo...@ma...> - 2003-03-10 07:52:15
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> > I checked the list archives for answers, > Thanks for checking first! > > > but I couldn't find > > anything and the sf system seems to be really terrible. > What made it so horrible? Response time, organization,...? I was hoping for a search option--enter 'object' and get all emails containing that word--but didn't find it. The monthly view didn't seem to show the expected results either and the daily check was a pain, so I just went through the titles by the hundeds--fortunately there are not so many, yet. Well, lots of 'cvs update'. Anyway, thanks a lot for the detailed answer, I'll study it next weekend--after all, there's a thesis to write... Boris. |
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From: Timothy H. <tim...@ma...> - 2003-03-10 20:35:44
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On Monday, March 10, 2003, at 02:51 AM, Boris Tschirschwitz wrote: >>> I checked the list archives for answers, >> Thanks for checking first! >> >>> but I couldn't find >>> anything and the sf system seems to be really terrible. >> What made it so horrible? Response time, organization,...? > > I was hoping for a search option--enter 'object' and get all emails > containing that word--but didn't find it. The monthly view didn't seem > to > show the expected results either and the daily check was a pain, so I > just > went through the titles by the hundeds--fortunately there are not so > many, yet. Well, lots of 'cvs update'. Thanks for the report. There actually is a "search" feature, but its over in the sourceforge.net panel on the left side and has a "search This Mailing List" option. I don't know why they put it over there, it is way too easy to miss. Actually running a search with the word "classes" brings up about a dozen entries (including some using JavaAssist which I had forgotten about..., yet another way to create dynamic Java classes). > > Anyway, thanks a lot for the detailed answer, I'll study it next > weekend--after all, there's a thesis to write... First things first! Good luck, ---Tim--- > > Boris. > |
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From: Ken A. <kan...@bb...> - 2003-03-09 19:04:35
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We have not developed an object system for JScheme, however you can define Java classes in JScheme, see http://jscheme.sourceforge.net/jscheme/src/dclass/dclass.html for several ways. There is also http://jscheme.sourceforge.net/jscheme/src/dclass/record.scm for defining simple record structures more easily than using define-class directly. You can also define common lisp like methods. see http://jscheme.sourceforge.net/jscheme/src/elf/iterate.scm I do have a simple prototype based system that i use. I may check it is as an example. One of the main issues of an Object System for JScheme is how it would interact with Java classes. At 09:55 PM 3/8/2003 -0800, Boris Tschirschwitz wrote: >Hi. > >Assuming that my ignorance mostly stems from not having studied jscheme >long enough, I checked the list archives for answers, but I couldn't find >anything and the sf system seems to be really terrible. > >I am wondering about the following: If I want to program using classes and >objects, do I have to make all my structures Java classes, objects, ...? >I wonder if this might restrict me in manipulating these objects in the >scheme way. Yes, this sounds very vague, b/c I am not absolutely sure what >I am asking and hope that someone on the list might understand it better >than I do. >Would it be beneficial to use something like Meroon? > >Boris. > > > > > >------------------------------------------------------- >This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger >for complex code. Debugging C/C++ programs can leave you feeling lost and >disoriented. TotalView can help you find your way. Available on major UNIX >and Linux platforms. Try it free. www.etnus.com >_______________________________________________ >Jscheme-user mailing list >Jsc...@li... >https://lists.sourceforge.net/lists/listinfo/jscheme-user |
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