jscheme-user — list for general users

[Jscheme-user] Re: trimming listener output

[Timothy J H. <tjh...@br...>]

Hi Robert,

On Mar 10, 2005, at 12:58 PM, Robert MacIntyre wrote:
---snip---
> I'm after a slightly different target.  I have lots of ways to adjust
> the output of a program I write, but I want to fix the top-level
> interactive interpreter itself.  Coming from a background of using
> Allegro CL, I want the scheme interpreter to be more convenient for
> interactive development.  In Allegro, if I type something that returns
> a 10000-element list, it (by default) prints the first 10 elements
> plus ellipsis, rather than crashing emacs.  And if an error occurs, I
> get a short message and some options, rather than a stack dump.  I
> realize jscheme can't do all this right away, but it can do better.
>
> The tricky part is fixing it without breaking other things, since it
> looks like the read-eval-print loop is used for lots of things other
> than direct user interaction.
True ...
>  I can think of a few approaches: (1)
> break the non-interactive case (bad, but all I have so far), (2) write
> my own REPL in scheme and invoke it at startup, (3) write a similar
> function in java, or (4) add conditionals to the main one to somehow
> distiguish between interactive and non-interactive use.  I prefer #4
> for the sake of other future jscheme users, but it's probably the
> hardest to get right.  Perhaps it would be safer to start with some
> variation of #3?

I think 4 is a reasonable approach.
The easiest thing to do as a first step is to create a public static int
variable to that gives the global print depth (zero for infinite depth?
zero by default?) The REPL could set it to a reasonable value for
interactive sessions. We could specify an interactive session on
the command line:

   % java -cp jscheme.jar jscheme.REPL -interactive

One could also change the depth at runtime:

   > (set! jsint.Scheme.printDepth$ 10)

We could also add a global variable for controlling the type of 
debugging
output generated displayed when an exception is thrown ...

How does that sound???


---Tim---

[Jscheme-user] Scheme UK Meeting: 6 April 2005: Functional Languages for Scientific Computing

[Noel W. <noe...@ya...>]

              Scheme UK Meeting: 6 April 2005

The next meeting of the Scheme UK user's group will be held
on 6 April 2005 from 7pm till we leave for the
pub.  The meeting will take place at the offices of LShift
(see http://www.lshift.net/contact.html for directions).
This meeting will be held in conjuction with UK Lispers.

Jon Harrop: Functional Languages for Scientific Computing

Flying Frog Consultancy (http://www.ffconsultancy.com)
are a Cambridge UK based consultancy specialising in
scientific software.  Work to date includes real-time 3-D
visualisation, development of a JIT compiler for
Mathematica, and vector graphics.
Flying Frog Consultancy does a large portion of their
work in the functional language O'Caml.  They have just
published a book entitled Objective CAML for Scientists
Jon Harrop from Flying Frog will present some of their
work, and discuss the applicability and advantages of
functional languages.  Copies of Objective CAML for
Scientists will be available at a discounted price.


=========================================================

Scheme UK is a UK based group of people interested in the
Scheme programming language in particular, and advanced
programming languages in general.  We are interested in
both practical and theoretic aspects.  We meet on the
first Wednesday of each month.  Newcomers are welcome.

For more details see:

  http://schematics.sourceforge.net/scheme-uk/


Email: noelwelsh <at> yahoo <dot> com
AIM: noelhwelsh


		
__________________________________ 
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Yahoo! Small Business - Try our new resources site!
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[Jscheme-user] CALL FOR PAPERS: ACM SIGPLAN 2005 Workshop on Scheme and Functional Programming

[Michael S. <sp...@in...>]

----------------------------------------------------------------------

                          CALL FOR PAPERS

    ACM SIGPLAN 2005 Workshop on Scheme and Functional Programming
                http://www.deinprogramm.de/scheme-2005/

	  	          Tallinn, Estonia
                         24 September 2005

        The workshop will be held in conjunction with ICFP 2005.
                  http://www.brics.dk/~danvy/icfp05/

----------------------------------------------------------------------
Important dates

Submission Deadline: June 13, 2005, 0:00 UTC
Author notfication:  July 29, 2005
Final paper due:     August 22, 2005, 0:00 UTC

----------------------------------------------------------------------
Purpose

The 2005 Scheme Workshop provides a forum for discussing experience
with and future development of the Scheme programming language. The
scope of the workshop includes all aspects of the design,
implementation, theory, and application of Scheme. Past workshops have
been held in Snowbird (2004), Boston (2003), Pittsburgh (2002), Florence
(2001), and Montr=E9al (2000). We encourage everyone interested in
Scheme to participate.

----------------------------------------------------------------------
Scope

We invite submissions in the following categories:

Technical papers

  Papers on all technical aspects of the Scheme programming language,=20
  including language design, implementation, theory, and tools.

Practice and experience

  Papers about using Scheme for practical applications and large
  systems.

Proposals for language changes, extensions and libraries

  Papers containing proposals for changes in the language, language
  extensions, and libraries, including SRFIs past, present and future.
  Where applicable, the content of such a paper should be submitted as
  a SRFI draft, if that isn't already the case.

Scheme pearls

  Papers about elegant, instructive or surprising Scheme programs.

Education

  Papers about uses of Scheme in all aspects of education.

System demonstrations

  Proposals for demonstrations of Scheme systems or applications
  written in Scheme.

----------------------------------------------------------------------
Submission guidelines

Authors should submit

- a 100-200 word abstract
- some indication on the desired length of the presentation at the worksh=
op
- a full paper

electronically to Mike Sperber <sperber at deinprogramm.de>, or via some
other means to the organizers by the beginning of Monday, June 13,
Universal Coordinated Time. (The beginning of the day UTC corresponds
to 8:00 PM EDT on Sunday, June 12, 6:00 PM MDT, and 5:00 PM PDT.)

Papers must be submitted in either PDF format or as PostScript
documents that are interpretable by Ghostscript. Papers must be
printable on US Letter sized paper.

Submissions should be typeset in 10 point font on 12 point baseline in
two columns 20pc (3.33in) wide and 54pc (9in) tall with a column
gutter of 2pc (0.33in). Submissions should be no more than 15 pages
including text, figures, and bibliography.  Authors wishing to supply
additional material to the reviewers beyond the 15 page limit may do
so in clearly marked appendices, on the understanding that reviewers
are not required to read the appendices.  Authors using LaTeX should
use the new SIGPLAN LaTeX class file, available from the Scheme 2005
workshop site.

Submitted papers must have content that has not previously been
published in other conferences or refereed venues. Simultaneous
submission to other conferences or refereed venues is
unacceptable.

-------------------------------------------------------------------------=
------
Organizers

  Program committee

  J. Michael Ashley (co-chair) (Beckman Coulter, Inc.)
  Martin Gasbichler            (University of T=FCbingen)
  Jonathan Rees                (Millennium Pharmaceuticals)
  Dorai Sitaram                (Verizon)
  Jonathan Sobel               (Indiana University)
  Michael Sperber (co-chair)   (DeinProgramm)

 =20

Re: [Jscheme-user] Problems loading contributed scheme code+install stuff

[Geoffrey K. <ge...@kn...>]

I confirm the following works on Mac OS X 10.3.8 and Fedora Core 2:

$ bin/make.sh
$ java -cp lib/jscheme.jar jscheme.REPL

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

On Feb 26, 2005, at 19:35, Timothy J Hickey wrote (to Joseph Toman):

> It would be great if you (and others) could check out the latest 
> version of JScheme
> from CVS and see if it builds correctly on your platform.
>
> >  bin/make.sh
>
> will build the system and
>
> > jscheme -cp lib/jscheme.jar jscheme.REPL
>
> will run the system.

Fwd: [Jscheme-user] Problems loading contributed scheme code+install stuff

[Timothy J H. <tjh...@br...>]

Hi Joseph,

I've created a make script for linux/macOSX systems in 
jscheme/bin/make.sh
and fixed a bug in the jscheme/src/build/make.scm file which prevented 
it from
working correctly on linux/macOSX systems. The change has now propogated
into the anonymous CVS (it takes about a day).

It would be great if you (and others) could check out the latest 
version of JScheme
from CVS and see if it builds correctly on your platform.

 >  bin/make.sh

will build the system and

 > jscheme -cp lib/jscheme.jar jscheme.REPL

will run the system. I've tested it with jdk1.5 on a SUSE linux and it 
works well.
Ken had fixed the
     (.append sb "abc")
problem a few months ago, but we haven't made a release since the fix.
If this current version builds everywhere, then I'll make another 
release (JScheme 7.2).

Best,
---Tim---



> On Feb 25, 2005, at 11:47 AM, Joseph Toman wrote:
>
>> Tim,
>>
>> So between Object and StringBuffer in the inheritance hierarchy 
>> there's a private class? That seems wrong somehow. I mean, wrong that 
>> the javadoc doesn't indicate that.
>> Yes, once I write a build.xml I'll send it your way. Is there anything
>> non-obvious in the make.scm system that I should notice? Any critical 
>> definitions, e.g. version numbers, that aren't in the code proper?
>> I should be asking this on the dev list, shouldn't I?
>>
>> 						J. Toman
>

Re: [Jscheme-user] Problems loading contributed scheme code+install stuff

[Timothy J. H. <tim...@ma...>]

On Feb 23, 2005, at 2:30 PM, Joseph Toman wrote:

> Timothy J Hickey wrote:
>> Hi Joseph,
>>   I'm away from work for a week (with a Mac but no Linux, and hence 
>> no jdk1.5...)
>> I'll look into it when I return, but I think the problem is in the 
>> implementation of
>> quasistrings. Tatu Tarvainen diagnosed the problem in an 
>> jscheme-devel email
>> last October 22 (2004):
>>> Some Java-calls don't seem to work under JDK 1.5.0.
>>> Using quasi-strings fails, because the StringBuffer append method 
>>> fails.
>>>
>>> This happens with the latest jscheme jar and the CVS version.
>>> I think the reflective access to the append method fails because in 
>>> Java
>>> 5 the java.lang.StringBuffer class inherits from a new
>>> java.lang.AbstractStringBuilder class which is not public and also
>>> provides the append method.
>
> ??? Not as far as I can see, looking at the 1.5 JDK javadoc. The only
> change I see is the addition of a StringBuilder class which is a drop 
> in replacement for StringBuffer, and which they recommend using if the 
> original StringBuffer is only used in a single thread.
You wouldn't see the private class in the javadoc.

If you can get jscheme to work (without elf), you can find the private 
class using ...
     (define sb (StringBuffer.))
     (.getClass sb)
and it should return java.lang.AbstactStringBuilder

If this throws an exception, you might need to use the # to indicate
javadot that accesses private methods ...
     (.getClass# sb)

Does this return the AbstractStringBuilder class?
(I'll check it myself when I return from vacation on Monday....)

>
>>>
>> Since I work mainly on the Mac I haven't been using jdk1.5. I'll 
>> install it on my
>> Linux box when I return and see how it works. The fix is probably to 
>> modify
>> the code implementing quasistrings by replacing all  (.append sb ...) 
>> calls with
>> (.StringBuffer.append sb ....)
>
> Is there a difference between .StringBuffer.append and .append ?
Yes,
    (.StringBuffer.append sb "abc")
looks up the append instance method of the StringBuffer class which has 
one String argument.
It then applies it to the sb object with the string argument "abc"

    (.append sb "abc")
calls a reflection method to get the class of the sb object and then 
uses that class
to find an append instance method with one string argument. It may have 
to pass to the
ancestor classes to find the appropriate method.

The main difference is that the javadot which includes the classname
    (.StringBuffer.append sb "abc")
does not have to dynamically find the class of the sb object. It could 
be that
sb is a private class which extends the StringBuffer class.
This notation is especially useful when writing applets where there are 
many
restrictions on reflection.

Note that you can also include the full classname
   (.java.lang.StringBuffer.append sb "abc")
The initial dot indicates that it is an instance method.


>
>
>> On Feb 22, 2005, at 6:20 PM, Joseph Toman wrote:
>>> A) These are in reverse order, but the transcript below is so long I 
>>> thought this might get lost. After B) I tried getting the current 
>>> codebase from CVS and building it. I'm sure this marks me as not 
>>> being a true-believer, but wouldn't a Makefile or a build.xml be 
>>> perhaps less exciting, but ultimately more useful ? Suffice to say I 
>>> couldn't get it
>>> to build, though I got very close once I abandoned the default 
>>> method and built an Eclipse project for it. build.CompilingLoadlet 
>>> uses internal sun.* classes which apparently didn't make it to JDK 
>>> 1.5,
>> Ahhh. I'll have to look into this also.
>> The pure JScheme approach is nice because it works on all platforms 
>> (except of course when a new version of Java requires
>> breaks it temporarily....) and you don't need to download any 
>> additional tools (cygwin, ant, ...)
>> I'll track down those sun.* dependencies.
>
>
> Well, once you've installed a JDK, javax.servlet.jar and bsf.jar, one 
> little ant.jar isn't that much. I think I'll write a build.xml and
> post it somewhere once I'm done with my current project.
That would be great. If you'ld care to denote it to the JScheme 
project, we can include it in the CVS codebase.

> For production
> systems it's useful to have a vanilla build that integrates with other 
> environments and ant is fairly ubiquitous.
I agree. For those that are using Ant regularly, it would be nice to 
have an ant-friendly build file....

Best wishes,
---Tim Hickey---


>
>
> 						Thanks,
> 							J. Toman
>
>
> -------------------------------------------------------
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Re: [Jscheme-user] Problems loading contributed scheme code+install stuff

[Joseph T. <jj...@ed...>]

Timothy J Hickey wrote:
> Hi Joseph,
>   I'm away from work for a week (with a Mac but no Linux, and hence no 
> jdk1.5...)
> I'll look into it when I return, but I think the problem is in the 
> implementation of
> quasistrings. Tatu Tarvainen diagnosed the problem in an jscheme-devel 
> email
> last October 22 (2004):
> 
>> Some Java-calls don't seem to work under JDK 1.5.0.
>> Using quasi-strings fails, because the StringBuffer append method fails.
>>
>> This happens with the latest jscheme jar and the CVS version.
>> I think the reflective access to the append method fails because in Java
>> 5 the java.lang.StringBuffer class inherits from a new
>> java.lang.AbstractStringBuilder class which is not public and also
>> provides the append method.

??? Not as far as I can see, looking at the 1.5 JDK javadoc. The only
change I see is the addition of a StringBuilder class which is a drop in 
replacement for StringBuffer, and which they recommend using if the 
original StringBuffer is only used in a single thread.

>>
> 
> Since I work mainly on the Mac I haven't been using jdk1.5. I'll install 
> it on my
> Linux box when I return and see how it works. The fix is probably to modify
> the code implementing quasistrings by replacing all  (.append sb ...) 
> calls with
> (.StringBuffer.append sb ....)

Is there a difference between .StringBuffer.append and .append ?


> On Feb 22, 2005, at 6:20 PM, Joseph Toman wrote:
>> A) These are in reverse order, but the transcript below is so long I 
>> thought this might get lost. After B) I tried getting the current 
>> codebase from CVS and building it. I'm sure this marks me as not being 
>> a true-believer, but wouldn't a Makefile or a build.xml be perhaps 
>> less exciting, but ultimately more useful ? Suffice to say I couldn't 
>> get it
>> to build, though I got very close once I abandoned the default method 
>> and built an Eclipse project for it. build.CompilingLoadlet uses 
>> internal sun.* classes which apparently didn't make it to JDK 1.5,
> 
> Ahhh. I'll have to look into this also.
> The pure JScheme approach is nice because it works on all platforms 
> (except of course when a new version of Java requires
> breaks it temporarily....) and you don't need to download any additional 
> tools (cygwin, ant, ...)
> I'll track down those sun.* dependencies.


Well, once you've installed a JDK, javax.servlet.jar and bsf.jar, one 
little ant.jar isn't that much. I think I'll write a build.xml and
post it somewhere once I'm done with my current project. For production
systems it's useful to have a vanilla build that integrates with other 
environments and ant is fairly ubiquitous.


						Thanks,
							J. Toman

Re: [Jscheme-user] Problems loading contributed scheme code+install stuff

[Timothy J H. <tjh...@br...>]

Hi Joseph,
   I'm away from work for a week (with a Mac but no Linux, and hence no 
jdk1.5...)
I'll look into it when I return, but I think the problem is in the 
implementation of
quasistrings. Tatu Tarvainen diagnosed the problem in an jscheme-devel 
email
last October 22 (2004):

> Some Java-calls don't seem to work under JDK 1.5.0.
> Using quasi-strings fails, because the StringBuffer append method 
> fails.
>
> This happens with the latest jscheme jar and the CVS version.
> I think the reflective access to the append method fails because in 
> Java
> 5 the java.lang.StringBuffer class inherits from a new
> java.lang.AbstractStringBuilder class which is not public and also
> provides the append method.
>

Since I work mainly on the Mac I haven't been using jdk1.5. I'll 
install it on my
Linux box when I return and see how it works. The fix is probably to 
modify
the code implementing quasistrings by replacing all  (.append sb ...) 
calls with
(.StringBuffer.append sb ....)

In jscheme/src/jsint/primproc.scm modify the following procedure

(define (!{} . args)
   ;; KRA 21JUN04: This is like (apply string-append (flaten args)).
   (let loop
       ((args args)
        (sb (StringBuffer.)))
     (cond ((null? args) (.toString sb))
           ((pair? (car args))
            (loop (cons (car (car args))
                        (cons (cdr (car args)) (cdr args))) sb))
           ((null? (car args)) (loop (cdr args) sb))
           (else (.append sb (U.stringify (car args) #f))
                 (loop (cdr args) sb)))))

by replacing the .append with .StringBuffer.append

That's my best guess for fixing the problem....
I'll try it when I return on Monday, but you could try it earlier if you
want.





On Feb 22, 2005, at 6:20 PM, Joseph Toman wrote:

>
>
>
>
> A) These are in reverse order, but the transcript below is so long I 
> thought this might get lost. After B) I tried getting the current 
> codebase from CVS and building it. I'm sure this marks me as not being 
> a true-believer, but wouldn't a Makefile or a build.xml be perhaps 
> less exciting, but ultimately more useful ? Suffice to say I couldn't 
> get it
> to build, though I got very close once I abandoned the default method 
> and built an Eclipse project for it. build.CompilingLoadlet uses 
> internal sun.* classes which apparently didn't make it to JDK 1.5,
Ahhh. I'll have to look into this also.
The pure JScheme approach is nice because it works on all platforms 
(except of course when a new version of Java requires
breaks it temporarily....) and you don't need to download any 
additional tools (cygwin, ant, ...)
I'll track down those sun.* dependencies.

Thanks for the bug report and diagnosis!

Best,
---Tim---

> which is of course why you're not supposed to use them. There are also 
> a lot of static method calls being made as if they weren't static, 
> which is odd.
>
> B) When I try to load many of the files in the elf directory,
> I get the typical result below. Ideas?
>
> JScheme 7.1 (8/5/04 12:39 PM) http://jscheme.sourceforge.net
> >(load "elf/basic.scm")
>  ** WARNING: Error during load (lineno 23): jsint.BacktraceException[
>
> (.append sb (U.stringify (car args )#f ))
>   args = ("\nExample of using import and define-method.  \n(describe 
> x) uses JDK 1.2 AccessibleObject to desc...
>   sb =
>   loop = (lambda !{}~1 (args sb)...)
>   args= = ("\nExample of using import and define-method.  \n(describe 
> x) uses JDK 1.2 AccessibleObject to desc...
>   sb= =
>   args = ("\nExample of using import and define-method.  \n(describe 
> x) uses JDK 1.2 AccessibleObject to desc...
>
> ---snip---

[Jscheme-user] Problems loading contributed scheme code+install stuff

[Joseph T. <jj...@ed...>]

A) These are in reverse order, but the transcript below is so long I 
thought this might get lost. After B) I tried getting the current 
codebase from CVS and building it. I'm sure this marks me as not being a 
true-believer, but wouldn't a Makefile or a build.xml be perhaps less 
exciting, but ultimately more useful ? Suffice to say I couldn't get it
to build, though I got very close once I abandoned the default method 
and built an Eclipse project for it. build.CompilingLoadlet uses 
internal sun.* classes which apparently didn't make it to JDK 1.5,
which is of course why you're not supposed to use them. There are also a 
lot of static method calls being made as if they weren't static, which 
is odd.

B) When I try to load many of the files in the elf directory,
I get the typical result below. Ideas?

JScheme 7.1 (8/5/04 12:39 PM) http://jscheme.sourceforge.net
 >(load "elf/basic.scm")
  ** WARNING: Error during load (lineno 23): jsint.BacktraceException[

(.append sb (U.stringify (car args )#f ))
   args = ("\nExample of using import and define-method.  \n(describe x) 
uses JDK 1.2 AccessibleObject to desc...
   sb =
   loop = (lambda !{}~1 (args sb)...)
   args= = ("\nExample of using import and define-method.  \n(describe 
x) uses JDK 1.2 AccessibleObject to desc...
   sb= =
   args = ("\nExample of using import and define-method.  \n(describe x) 
uses JDK 1.2 AccessibleObject to desc...

   ====================================
SchemeException: Bad method application from a private class: , 
"(java.lang.IllegalAccessException: Class jsint.Invoke can not access a 
member of class java.lang.AbstractStringBuilder with modifiers 
\"public\" public java.lang.AbstractStringBuilder 
java.lang.AbstractStringBuilder.append(java.lang.String) #(\nExample of 
using import and define-method.  \n(describe x) uses JDK 1.2 
AccessibleObject to describe private\nfields of object x. 
\n\nExample:\n> (describe '(1 2 3))\nan insta...

(.append sb (U.stringify (car args )#f ))
   args = ("\nExample of using import and define-method.  \n(describe x) 
uses JDK 1.2 AccessibleObject to desc...
   sb =
   loop = (lambda !{}~1 (args sb)...)
   args= = ("\nExample of using import and define-method.  \n(describe 
x) uses JDK 1.2 AccessibleObject to desc...
   sb= =
   args = ("\nExample of using import and define-method.  \n(describe x) 
uses JDK 1.2 AccessibleObject to desc...

   ====================================
SchemeException: Bad method application from a private class: , 
"(java.lang.IllegalAccessException: Class jsint.Invoke can not access a 
member of class java.lang.AbstractStringBuilder with modifiers 
\"public\" public java.lang.AbstractStringBuilder 
java.lang.AbstractStringBuilder.append(java.lang.String) #(\nExample of 
using import and define-method.  \n(describe x) uses JDK 1.2 
AccessibleObject to describe private\nfields of object x. 
\n\nExample:\n> (describe '(1 2 3))\nan instance of jsint.Pair\n  first: 
1\n  rest: (2 3)\n()\n\n(describe) calls the generic function 
(describe-object) which returns\na string.\n\nDescribing a class will 
show it constructors, fields, and methods.\nDescribing a procedure or 
generic function will display its definition.\n\n(whoCalls symbol) 
returns a list of the names of the procedures\nthat call the procedure 
named symbol.\nExample:\n> (whoCalls 
'short-toString)\n(describe-object)\n))"
** WARNING: Error during load (lineno 46): jsint.BacktraceException[

(.append sb (U.stringify (car args )#f ))
   args = ("\n\nThese utilities let you play with data in a somewhat 
relational way.\nHere's a translation fro...
   sb =
   loop = (lambda !{}~1 (args sb)...)
   args= = ("\n\nThese utilities let you play with data in a somewhat 
relational way.\nHere's a translation fro...
   sb= =
   args = ("\n\nThese utilities let you play with data in a somewhat 
relational way.\nHere's a translation fro...

   ====================================
SchemeException: Bad method application from a private class: , 
"(java.lang.IllegalAccessException: Class jsint.Invoke can not access a 
member of class java.lang.AbstractStringBuilder with modifiers 
\"public\" public java.lang.AbstractStringBuilder 
java.lang.AbstractStringBuilder.append(java.lang.String) #(\n\nThese 
utilities let you play with data in a somewhat relational way.\nHere's a 
translation from scheme to the SQL equivalent.\n\nAssume data is a table 
(in SQL) or a collecti...

(.append sb (U.stringify (car args )#f ))
   args = ("\n\nThese utilities let you play with data in a somewhat 
relational way.\nHere's a translation fro...
   sb =
   loop = (lambda !{}~1 (args sb)...)
   args= = ("\n\nThese utilities let you play with data in a somewhat 
relational way.\nHere's a translation fro...
   sb= =
   args = ("\n\nThese utilities let you play with data in a somewhat 
relational way.\nHere's a translation fro...

   ====================================
SchemeException: Bad method application from a private class: , 
"(java.lang.IllegalAccessException: Class jsint.Invoke can not access a 
member of class java.lang.AbstractStringBuilder with modifiers 
\"public\" public java.lang.AbstractStringBuilder 
java.lang.AbstractStringBuilder.append(java.lang.String) #(\n\nThese 
utilities let you play with data in a somewhat relational way.\nHere's a 
translation from scheme to the SQL equivalent.\n\nAssume data is a table 
(in SQL) or a collection in JScheme.\n\n(filter p data) 
select * from data where p\n\n(map* (project x y z) data)    select x, 
y, z from data\n\n(sort data (comparator < x))   select * from data 
order by x\n\n(map* (project (unique car) (count cadr))\n      (group-by 
(project x y) data)\n                               select unique(x), 
count(y) from data\n\t\t\t       group by x, y\n\nGroup-by example - 
print the names of methods that are defined in both\nJButton and JFrame 
classes:\n\n  (for-each\n   print\n   (map (unique .getName)\n\t(filter 
(lambda (x) (> (length x) 1))\n\t\...
** WARNING: Error during load (lineno 167): jsint.BacktraceException[

(.append sb (U.stringify (car args )#f ))
   args = ("\nThis is a very nice merge sort from Dybvig's The Scheme 
language\nsecond edition: http://www.sch...
   sb =
   loop = (lambda !{}~1 (args sb)...)
   args= = ("\nThis is a very nice merge sort from Dybvig's The Scheme 
language\nsecond edition: http://www.sch...
   sb= =
   args = ("\nThis is a very nice merge sort from Dybvig's The Scheme 
language\nsecond edition: http://www.sch...

   ====================================
SchemeException: Bad method application from a private class: , 
"(java.lang.IllegalAccessException: Class jsint.Invoke can not access a 
member of class java.lang.AbstractStringBuilder with modifiers 
\"public\" public java.lang.AbstractStringBuilder 
java.lang.AbstractStringBuilder.append(java.lang.String) #(\nThis is a 
very nice merge sort from Dybvig's The Scheme language\nsecond edition: 
http://www.scheme.com/tspl2d/examples.html#g2335\nThe input list is 
copied once.\n\nThe merge ...

(.append sb (U.stringify (car args )#f ))
   args = ("\nThis is a very nice merge sort from Dybvig's The Scheme 
language\nsecond edition: http://www.sch...
   sb =
   loop = (lambda !{}~1 (args sb)...)
   args= = ("\nThis is a very nice merge sort from Dybvig's The Scheme 
language\nsecond edition: http://www.sch...
   sb= =
   args = ("\nThis is a very nice merge sort from Dybvig's The Scheme 
language\nsecond edition: http://www.sch...

   ====================================
SchemeException: Bad method application from a private class: , 
"(java.lang.IllegalAccessException: Class jsint.Invoke can not access a 
member of class java.lang.AbstractStringBuilder with modifiers 
\"public\" public java.lang.AbstractStringBuilder 
java.lang.AbstractStringBuilder.append(java.lang.String) #(\nThis is a 
very nice merge sort from Dybvig's The Scheme language\nsecond edition: 
http://www.scheme.com/tspl2d/examples.html#g2335\nThe input list is 
copied once.\n\nThe merge sorting algorithm works quite simply. The 
input list is\nsplit into two approximately equal sublists. These 
sublists are sorted\nrecursively, yielding two sorted lists. The sorted 
lists are then\nmerged to form a single sorted list. The base cases for 
the recursion\nare lists of one and two elements, which can be sorted 
trivially.\n))"
#t
 >


						J. Toman

[Jscheme-user] taglibs; tomcat

[Geoffrey K. <ge...@kn...>]

2 questions.  Can JScheme servlets be used with tag libraries?  Can 
Tomcat be used instead of Jetty?  I have no problem with Jetty, but 
integration with Tomcat would help JScheme acceptance among my peers.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

Re: [Jscheme-user] Question

[Timothy J. H. <ti...@cs...>]

On Feb 14, 2005, at 2:40 PM, Allegrini Christophe Bird Technology wrote:

> =A0
>  Timothy and JScheme users,
> =A0
> Hello,
> =A0
> Follow my previous email, I am ready to spend time to contribute to=20
> the evolution of JScheme.
Great...


> I think this project must live and evolve.
JScheme will definitely continue.
I will soon be adding one of my graduate students as another Developer
and we'll work on writing up a description of the JScheme internals to=20=

make it easier
for people to understand the source code.

> I have two little questions :
>  =A0=A0=A0 Does there exist a roadmap for JScheme?
The current game plan for JScheme is
  * fix bugs as they arise
  * improve performance where possible (e.g. we are working on an=20
optimizing  Scheme->Java compiler)
  * extend javadot so that it runs nicely under Java 1.5 on all =
platforms
  * remain backward compatible
  * make it easier for people to use JScheme
     - more documentation
     - more sample code
I would like JScheme to remain relatively small. One of the nice things=20=

about Scheme is that it
is a concise language. JScheme adheres to the philosophy of "small and=20=

simple is good" by adding
relatively few features (javadot, Threads, Exceptions, modules).

I would be very interested in hearing what other JScheme users would=20
like to see in future
versions of the language.

We could be "BOLD" and create radically new versions of JScheme that=20
would not be backward compatible,
but this would require us to maintain bug fixes on multiple branches of=20=

the development tree. I'm not
completely opposed to that, but I would prefer to keep JScheme simple=20
and just polish it so that it is
a very nice, clean, powerful tool.



>  =A0=A0=A0 Are there documents describing internal architecture?
Not yet, but this is part of the "more documentation" part of the game=20=

plan.



Cheers,
---Tim---

> =A0
> Best Regards,
> =A0
> Christophe Allegrini
> =A0
> www.birdtechnology.net

[Jscheme-user] Question

[Allegrini C. B. T. <chr...@bi...>]

=20
Timothy and JScheme users,

Hello,

Follow my previous email, I am ready to spend time to contribute to the =
evolution of JScheme.
I think this project must live and evolve.
I have two little questions :=20
    Does there exist a roadmap for JScheme?=20
    Are there documents describing internal architecture?

Best Regards,

Christophe Allegrini

www.birdtechnology.net

Re: [Jscheme-user] Questions

[Timothy J H. <tjh...@br...>]

Hi Joseph,


On Feb 10, 2005, at 4:34 PM, Joseph Toman wrote:

> Hi,
>
> I don't know if this is a JScheme question or just a scheme question,  
> but I was wondering why (if (apply and '(#t #f)) #t #f) returns #t ?
Its partly a Scheme question and partly JScheme.
We have implemented "and" as a macro and hence it cannot appear as an  
argument to apply
(as it is primarily syntax not a real operator).

When you evaluate (apply and '(#t #f)) it expands the macro and returns  
an expression indeed

 > (apply and '(A B))
(if A (and B) #f)
 >

It probably should throw an error as that would make your example less  
confusing...

Anyway, when you evaluate (if (apply and '(#t #f)) #t #f)
the condition in the evaluates to a non-false quantity which is treated  
by Scheme as true
and hence it returns #t.


>
> Why doesn't the command line interpreter recognize many of the special  
> forms as being bound ?
The special forms are part of the syntax of Scheme expressions but they  
are not bound to procedures.



>
> This is more of a "just curious how other people do it" sort of  
> question:
> How do people use JScheme?

I'd like to know the answer to this one too!

I can tell you how I use it and I'd like to hear about others  
approaches to the language.

> Is it Scheme with a nice set of libraries?
I use it to teach Scheme to beginners (but it doesn't have full call/cc  
so its not good for teaching
the full Scheme language).

>  A looser java-ish scripting language?
This is how I use it.  I've used it to build Scheme servlets for  
writing dynamic websites
(e.g. http://www.4collegewomen.org is all written in JScheme)

and I use it to teach non-science students how to webprogram
(e.g. http://popper.cs-i.brandeis.edu:8080/cs2a04 links to a Intro to  
Computers course based in Scheme
also  
http://popper.cs-i.brandeis.edu:8080/classes/spr05/cs33b/blog2/ 
source.html points to a blogsite written
in Scheme for another non-science major class on Internet and Society)

I've used it in to build groupware in an NSF sponsored project
(http://www.cs.brandeis.edu/~tim/GMCP  where we've build a  
collaborative editor
that allows many people to simultaneously edit a single document with  
no locks ....
I use the GrewpEdit tool (written in JScheme) almost every day in  
another Intro
class I'm teaching  
http://popper.cs-i.brandeis.edu:8080/classes/spr05/typcs )

Two summers ago I used it to teach a course in 3D graphics in which we  
used the gl4j OpenGL bindings
to write OpenGL programs.

Most recently, I've been using it for some exploratory Neuroscience  
research where we are using
dimension stacking to study high dimensional computational models of  
neurons.
(see http://www.cs.brandeis.edu/~tim/neuron for some pretty pictures)

In all of these cases (and others) I use JScheme because it gives me  
access to all of the
Java libraries that I want to use and yet it allows me to use the  
Scheme conceptual world
to think about and implement the programs I need to write.  Since its  
written in Java it
runs anywhere and interoperates with all sorts of great applications,  
and it can be used
to write Java servlets, Java applets, and Java Web Start applications.





>  Somewhere in between? How do people choose where the Scheme ends and  
> the Java begins?
I usually write directly in Javadot when I first start using a Java API  
and then later build a Scheme
library to hide the Java API details and allow me to program in a more  
declarative style.


>  Is that time dependent, i.e. does code migrate from Scheme to Java or  
> visa versa?
I have had a need to convert Scheme code to Java (e.g. a student wants  
to extend a Scheme
program I wrote but would much rather write in Java, so they convert my  
Scheme to Java
and it usually turns out to be very nice looking Java code!)  I don't  
think I've ever tried
converting Java to Scheme, I would usually just stick it in a Jar and  
call it from Scheme....


>
> At my company we write CAD software for the wireless industry, placing
> transmitter sites, assigning channels, etc..
> We use JScheme to allow our legacy C++ code base to control a JVM that  
> currently runs some secondary utilities, but will become more  
> important as we try to port the C++ to Java.

Nice application...


>  The combination of Scheme and JavaDot provides a nice regular syntax  
> that doesn't frighten C++ programmers too much,
Thats nice to hear!

>  and of particular importance to me is that I didn't have to hack  
> together a scripting language!
JScheme is not much more than the combination of the javadot interface  
with most of the R4RS language.

Thanks for your feedback and questions,
If anyone else wants to give their perspective, I for one would love to  
hear it.

Best,
---Tim---

>
> 					J. Toman
> 				     EDX Wireless LLC
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real  
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[Jscheme-user] Questions

[Joseph T. <jj...@ed...>]

Hi,

I don't know if this is a JScheme question or just a scheme question, 
but I was wondering why (if (apply and '(#t #f)) #t #f) returns #t ?

Why doesn't the command line interpreter recognize many of the special 
forms as being bound ?

This is more of a "just curious how other people do it" sort of question:
How do people use JScheme? Is it Scheme with a nice set of libraries? A 
looser java-ish scripting language? Somewhere in between? How do people 
choose where the Scheme ends and the Java begins? Is that time 
dependent, i.e. does code migrate from Scheme to Java or visa versa?

At my company we write CAD software for the wireless industry, placing
transmitter sites, assigning channels, etc..
We use JScheme to allow our legacy C++ code base to control a JVM that 
currently runs some secondary utilities, but will become more important 
as we try to port the C++ to Java. The combination of Scheme and JavaDot 
provides a nice regular syntax that doesn't frighten C++ programmers too 
much, and of particular importance to me is that I didn't have to hack 
together a scripting language!

					J. Toman
				     EDX Wireless LLC

[Jscheme-user] Human Spam Filter

[Timothy J H. <tjh...@br...>]

Dear JScheme users,

I've changed the jscheme-user list preferences so that every post will 
have to be approved by me
before it gets posted to the list. This will end the spam at the cost 
of a slight delay in
posting times. Thanks for your patience...

Best wishes,
---Tim---

[Jscheme-user] Jscheme integration in a new middleware

[Allegrini C. B. T. <chr...@bi...>]

Hello,

After having created a commercial middleware solution based on a owner =
LISP language,=20
I decided to integrate JScheme.=20

The middleware Bird Of Java, a Rich Internet Applications oriented, is =
written at the same time as Java and with a specific owner LISP.

But it missed the possibility of sending towards the customer nice GUI. =
This is why I decided to integrate JScheme, which through Java dot =
Notation, offers a particularly interesting single capacity.=20

I think, this shows the capacity of JScheme and the great work that it =
represents.


I am really sad by the death of Ken Anderson. Very sad news.


Best regards,=20

Christophe Allegrini

www.birdtechnology.net

[Jscheme-user] Sad News about Ken Anderson

[Timothy J H. <tjh...@br...>]

Dear JScheme  community,

I'm sorry to bring you the very sad news that Ken Anderson,
one of the co-developers of JScheme, died last night at the Spam 
conference
in Cambridge.  He was in great spirits, talking about JScheme, when
he collapsed mid-sentence.

Ken was one of the three main developers of JScheme.
JScheme had two parent languages -- Peter Norvig's SILK
and Tim Hickey's Jscheme applet.  Ken came onto the project
in the beginning (1997) and built the Scheme-Java interface that became
the javadot notation. He was responsible for the beautifully designed
cache techniques that make javadot so efficient. He also
was a tireless developer, chasing down bugs, dreaming up and
seriously analyzing proposed new optimizations. He was a
talented software engineer who loved building an elegant
and simultaneously practical language. He was also a really
nice guy. Kind, generous, thoughtful.  The world is a poorer
place for his passing.

Ken touched many lives and brought many communities together.
I worked with him on JScheme for 2-3 years (publishing two papers)
before I met him in person (or even knew what he looked like!)
We've met regularly since to plot the future of JScheme and to
share our war stories of JScheme in the world.  He has played
a major role in the Lightweight Language conferences and was
also an active player in the anti-Spam effort. I will miss him,
as I'm sure many other will as well.

JScheme will remain an active project and is very much part
of what Ken has given to the world. I am honored to have been
his friend and codeveloper.

Sincerely,
---Tim Hickey---

[Jscheme-user] spam conference friday

[Ken A. <kan...@bb...>]

Paul Graham's spam conference is Friday.
http://spamconference.org/
I'll be there!

k

[Jscheme-user] Fwd: [Beanshell-users] Poll Update: What is Your Scripting Language for Java of the Year 2004?

[Ken A. <kan...@bb...>]

I complained that several Scheme implementations were not in the poll, so he suggested i vote for kawa.
- at least it would give a sense of the number of people using Scheme in Java if we voted. 

>From: Gerald Bauer <lux...@ya...>
>To: bea...@li...
>Old-X-Spam-Score: -4.9 (----)
>Subject: [Beanshell-users] Poll Update: What is Your Scripting Language for Java of the Year 2004?
>Sender: bea...@li...
>X-BeenThere: bea...@li...
>X-Mailman-Version: 2.0.9-sf.net
>List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/beanshell-users>,
>        <mailto:bea...@li...?subject=unsubscribe>
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>List-Post: <mailto:bea...@li...>
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>        <mailto:bea...@li...?subject=subscribe>
>List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum=beanshell-users>
>X-Original-Date: Tue, 21 Dec 2004 23:44:22 -0500 (EST)
>Date: Tue, 21 Dec 2004 23:44:22 -0500 (EST)
>Old-X-Spam-Status: NO
>Old-X-Scanned-By: MIMEDefang 2.28 (www . roaringpenguin . com / mimedefang)
>Old-X-Scanned-By: MIMEDefang 2.35
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>X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on zima.bbn.com
>X-Spam-Level: 
>X-Spam-Status: No, hits=-4.9 required=5.0 tests=BAYES_00 autolearn=ham 
>        version=2.63
>
>Hello,
>
>  Just to let you know that the Java Republic poll
>asking "What is Your Scripting Language for Java of
>the Year 2004?" will run for another week.
>
>  If you haven't yet cast your vote, I urge you to
>rush to the pollstation now before it's too late. 
>
>  Here's the standing as of December, 21st:
>
>  o Jython (Python for Java)    471 votes (63%)
>  o Groovy                      112 votes (15%)
>  o BeanShell (Dynamic Java)     55 votes ( 7%)
>  o Rhino (JavaScript)           42 votes ( 6%)
>  o JRuby (Ruby for Java)        28 votes ( 4%)
>  o and so on
>
>  You can find the pollstation online
>http://jroller.com/page/viva/20041211#poll_what_is_your_scripting
>
>   - Gerald
>
>--------------------
>Gerald Bauer
>Web Start F.A.Q. | http://webstartfaq.com
>Web Start Forum  | http://webstartforum.com
>
>
>______________________________________________________________________ 
>Post your free ad now! http://personals.yahoo.ca
>
>
>-------------------------------------------------------
>SF email is sponsored by - The IT Product Guide
>Read honest & candid reviews on hundreds of IT Products from real users.
>Discover which products truly live up to the hype. Start reading now. 
>http://productguide.itmanagersjournal.com/
>_______________________________________________
>Beanshell-users mailing list
>Bea...@li...
>https://lists.sourceforge.net/lists/listinfo/beanshell-users

Re: [Jscheme-user] JScheme in business

[Ken A. <kan...@bb...>]

This is a great example!  Keep it up!

We should definitely develop such a library!

At 05:13 AM 12/21/2004, Geoffrey Knauth wrote:
>Maybe, with the right libraries, JScheme has a potential audience among management types with some technical ability.

Re: [Jscheme-user] JScheme in business

[Geoffrey K. <ge...@kn...>]

On Dec 21, 2004, at 05:13, Geoffrey Knauth wrote:
> Just letting you both know [...]

Oops.  I originally wrote the previous message to Ken and Tim, then 
realized maybe the list would be interested in the business use for 
JScheme I discovered.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

[Jscheme-user] JScheme in business

[Geoffrey K. <ge...@kn...>]

Just letting you both know, last week at (customer-site) we were 
reviewing screens.  There was one screen that was particularly ugly.  
On the spot I used JScheme to create an entirely new screen that 
conveyed the same information but looked much better.  It took about 
five minutes, short enough to be done in the background while people 
were talking, long enough for me to incorporate what they were saying 
into the new screen.  Anyway, they really liked what JScheme did so 
quickly.

The (local-business-manager) made a remark about "those screens 
Geoffrey creates so quickly," and the next morning he showed up with a 
few screens of his own he threw together with PowerPoint.  Obviously he 
got the point that showing new screens quickly to the customer is a 
strong selling point.  One of these days I'll have to show him a few 
JScheme tricks so that he can do better navigation and more dynamic 
content than is possible with PowerPoint.

Maybe, with the right libraries, JScheme has a potential audience among 
management types with some technical ability.

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

Re: [Jscheme-user] can't registerDriver...

[Geoffrey K. <gk...@ma...>]

Thank you Sir, that worked!

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

On Dec 16, 2004, at 06:17, Michael R Head wrote:

> How about this?
>
> (DriverManager.registerDriver (jstels.jdbc.csv.CsvDriver.))

Re: [Jscheme-user] can't registerDriver...

[Michael R H. <bu...@su...>]

On Thu, 2004-12-16 at 05:59 -0500, Geoffrey Knauth wrote:
> Maybe I'm dense.  I tried this:
>=20
> (load "elf/jdbc.scm")
> (load "elf/classpath.scm")
> (addClasspathUrl "csvdriver.jar")
> (DriverManager.registerDriver jstels.jdbc.csv.CsvDriver.)

How about this?

(DriverManager.registerDriver (jstels.jdbc.csv.CsvDriver.))

>=20
> Geoffrey

mike

> --
> Geoffrey S. Knauth | http://knauth.org/gsk

--=20
Michael R Head <bu...@su...>
GPG: http://www.suppressingfire.org/~burner/gpg.key.txt (ID 23A02B1F)

[Jscheme-user] can't registerDriver...

[Geoffrey K. <gk...@ma...>]

Maybe I'm dense.  I tried this:

(load "elf/jdbc.scm")
(load "elf/classpath.scm")
(addClasspathUrl "csvdriver.jar")
(DriverManager.registerDriver jstels.jdbc.csv.CsvDriver.)

and got this exception:

(DriverManager.registerDriver
   jstels.jdbc.csv.CsvDriver.)
   ====================================
SchemeException: java.lang.IllegalArgumentException: argument type 
mismatch
ARGUMENT MISMATCH for method

   public static synchronized void 
java.sql.DriverManager.registerDriver(java.sql.Driver) throws 
java.sql.SQLException
  called with ({jsint.JavaConstructor jstels.jdbc.csv.CsvDriver[0]})

What am I doing wrong?

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk