jscheme-devel — Developer's list

Re: [Jscheme-devel] Re: JScheme SchemeApplet - UC WISE Citris Project

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

I have more information.  (1) I added "jlib/" between "src/" and "demo/"
and then your Demorunner.html URL was found (no more Error-404).  (2)
When the applet came up, I had this in the Java Console:

java.io.FileNotFoundException:
http://www.cs.brandeis.edu/~tim/jscheme/src/applet.jar
	at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:689)
	at
sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:369)
	at
sun.net.www.protocol.http.HttpURLConnection.getHeaderFields(HttpURLConnection.java:1133)
	at
sun.plugin.net.protocol.http.HttpURLConnection.checkCookieHeader(HttpURLConnection.java:330)
	at
sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:367)
	at
sun.plugin.net.protocol.http.HttpUtils.followRedirects(HttpUtils.java:39)
	at sun.plugin.cache.CachedJarLoader.download(CachedJarLoader.java:311)
	at sun.plugin.cache.CachedJarLoader.load(CachedJarLoader.java:131)
	at sun.plugin.cache.JarCache.get(JarCache.java:177)
	at
sun.plugin.net.protocol.jar.CachedJarURLConnection.connect(CachedJarURLConnection.java:71)
	at
sun.plugin.net.protocol.jar.CachedJarURLConnection.getJarFile(CachedJarURLConnection.java:56)
	at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:498)
	at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:459)
	at sun.misc.URLClassPath$2.run(URLClassPath.java:255)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.misc.URLClassPath.getLoader(URLClassPath.java:244)
	at sun.misc.URLClassPath.getLoader(URLClassPath.java:221)
	at sun.misc.URLClassPath.getResource(URLClassPath.java:134)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
	at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:132)
	at
sun.plugin.security.PluginClassLoader.findClass(PluginClassLoader.java:189)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
	at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:473)
	at sun.applet.AppletPanel.createApplet(AppletPanel.java:548)
	at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1621)
	at sun.applet.AppletPanel.runLoader(AppletPanel.java:477)
	at sun.applet.AppletPanel.run(AppletPanel.java:290)
	at java.lang.Thread.run(Thread.java:536)


On Sun, 2002-05-26 at 16:19, Timothy Hickey wrote:
> 
> On Sunday, May 26, 2002, at 02:17 PM, Geoffrey S. Knauth wrote:
> 
> > I tried your applet with JDK1.4 plugin and Mozilla and Netscape 4.79 on
> > RedHat 7.3.  The applet comes up OK, but if I press Detach nothing
> > happens, and no matter what I type (even garbage) in the stop text area,
> > when I press Eval nothing happens.
> 
> hmmmm. Does jscheme run on your system??
> I've tested the applet successfully on
>    Mac OSX with IE and Netscape
>    Mac OS9.1 with IE
>    Windows 98 with IE
> But I don't currently have a RH7.3 box. I'll try to get one soon
> and try it out....
> Do any jscheme applets run (you can try for example
> 
>      http://www.cs.brandeis.edu/~tim/jscheme/src/demo/Demorunner.html
> 
> Thanks for the bug report!
> 
> ---Tim---
> >
> > Geoffrey
> >
> > On Sun, 2002-05-26 at 08:55, Timothy Hickey wrote:
> >> Hi Darrel,
> >>
> >> How has your Scheme interpreter applet project  for WISE been
> >> progressing lately?
> >>
> >> I recently checked in a new Scheme Interpereter applet
> >> that you might be interested in. It should run in all browsers
> >>
> >>     
> >> http://www.cs.brandeis.edu/~tim/jscheme/src/jlib/demo/SchemeEval.html
> >>
> >> and it does "paren matching" and auto-indenting.
> >>
> >> Since "flashing" parens is fairly difficult to implement in Java 1.1,
> >> this applet has an extra textarea showing the most recently
> >> matched complete expression. It is implemented entirely in
> >> Scheme with no additional Java classes needed.
> >>
> >> Please feel free to "steal" anything you want from the code,
> >> it is open-source with zlib/png licensing (the most open of
> >> the open-source licenses).
> >>
> >> We hope to add a "reformat" button, that will auto-indent every
> >> line of the file. Also, improved error reporting would be
> >> helpful especially for pedagogical purposes. For Java 1.2+
> >> applets (or Java Web Start), we can use Swing highlighting
> >> for paren matching....
> >>
> >> ----Tim---
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Saturday, March 30, 2002, at 12:33 AM, Dazhi Liu wrote:
> >>
> >>> Hi,
> >>>
> >>> I've downloaded the latest JScheme and finally had the applet compiled
> >>> under JDK 1.3.1_03 and run under both IE and Netscape 4.x. The problem
> >>> seemed to be that JDK 1.4 compiled a version that's imcompatible with
> >>> previous versions of JVM.
> >>>
> >>> Thank you for all your help.
> >>>
> >>> Best regards,
> >>> Darrel
> >>>
> >>>
> >>
> >>
> >> _______________________________________________________________
> >>
> >> Don't miss the 2002 Sprint PCS Application Developer's Conference
> >> August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm
> >>
> >> _______________________________________________
> >> Jscheme-devel mailing list
> >> Jsc...@li...
> >> https://lists.sourceforge.net/lists/listinfo/jscheme-devel
> >>
> > --
> > Geoffrey S. Knauth				http://knauth.org/gsk
> >
> >
> 
> 
> _______________________________________________________________
> 
> Don't miss the 2002 Sprint PCS Application Developer's Conference
> August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm
> 
> _______________________________________________
> Jscheme-devel mailing list
> Jsc...@li...
> https://lists.sourceforge.net/lists/listinfo/jscheme-devel
> 
-- 
Geoffrey S. Knauth				http://knauth.org/gsk

Re: [Jscheme-devel] Re: JScheme SchemeApplet - UC WISE Citris Project

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

On Sunday, May 26, 2002, at 02:17 PM, Geoffrey S. Knauth wrote:

> I tried your applet with JDK1.4 plugin and Mozilla and Netscape 4.79 on
> RedHat 7.3.  The applet comes up OK, but if I press Detach nothing
> happens, and no matter what I type (even garbage) in the stop text area,
> when I press Eval nothing happens.

hmmmm. Does jscheme run on your system??
I've tested the applet successfully on
   Mac OSX with IE and Netscape
   Mac OS9.1 with IE
   Windows 98 with IE
But I don't currently have a RH7.3 box. I'll try to get one soon
and try it out....
Do any jscheme applets run (you can try for example

     http://www.cs.brandeis.edu/~tim/jscheme/src/demo/Demorunner.html

Thanks for the bug report!

---Tim---
>
> Geoffrey
>
> On Sun, 2002-05-26 at 08:55, Timothy Hickey wrote:
>> Hi Darrel,
>>
>> How has your Scheme interpreter applet project  for WISE been
>> progressing lately?
>>
>> I recently checked in a new Scheme Interpereter applet
>> that you might be interested in. It should run in all browsers
>>
>>     
>> http://www.cs.brandeis.edu/~tim/jscheme/src/jlib/demo/SchemeEval.html
>>
>> and it does "paren matching" and auto-indenting.
>>
>> Since "flashing" parens is fairly difficult to implement in Java 1.1,
>> this applet has an extra textarea showing the most recently
>> matched complete expression. It is implemented entirely in
>> Scheme with no additional Java classes needed.
>>
>> Please feel free to "steal" anything you want from the code,
>> it is open-source with zlib/png licensing (the most open of
>> the open-source licenses).
>>
>> We hope to add a "reformat" button, that will auto-indent every
>> line of the file. Also, improved error reporting would be
>> helpful especially for pedagogical purposes. For Java 1.2+
>> applets (or Java Web Start), we can use Swing highlighting
>> for paren matching....
>>
>> ----Tim---
>>
>>
>>
>>
>>
>>
>> On Saturday, March 30, 2002, at 12:33 AM, Dazhi Liu wrote:
>>
>>> Hi,
>>>
>>> I've downloaded the latest JScheme and finally had the applet compiled
>>> under JDK 1.3.1_03 and run under both IE and Netscape 4.x. The problem
>>> seemed to be that JDK 1.4 compiled a version that's imcompatible with
>>> previous versions of JVM.
>>>
>>> Thank you for all your help.
>>>
>>> Best regards,
>>> Darrel
>>>
>>>
>>
>>
>> _______________________________________________________________
>>
>> Don't miss the 2002 Sprint PCS Application Developer's Conference
>> August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm
>>
>> _______________________________________________
>> Jscheme-devel mailing list
>> Jsc...@li...
>> https://lists.sourceforge.net/lists/listinfo/jscheme-devel
>>
> --
> Geoffrey S. Knauth				http://knauth.org/gsk
>
>

Re: [Jscheme-devel] Re: JScheme SchemeApplet - UC WISE Citris Project

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

On Sunday, May 26, 2002, at 02:15 PM, Dazhi Liu wrote:
> BTW, a quick question: After user program in JScheme for a while, is
> there an easy way to erase all user defined bindings, that is, to return
> to the initial state of JScheme?
>



Its not too hard. At the end of this note is a procedure that creates a 
SymbolTable
restorer. You use it as

 > (define z (make-state-restorer))
....
 > (z)
and it will restore your state to the initial one.



;; This is a System restorer
;;  It makes a copy of the Symbol table state which it stores in its 
returned value
;;     > (define z (make-state-restorer))
;; When you later invoke the thunk
;;     > (z)
;;  it resets the Symbol table to its
;; original values (but it doesn't reset the javadot primitives as this 
would just
;; waste time).

(define (make-state-restorer)
   (let
       ((ST0
         (java.util.Hashtable.))
        (isJavadot (lambda (x)
            (or (> (.indexOf x ".") -1) (> (.indexOf x "$") -1))))
        (enum->list
         (lambda(E)
           (let loop ((L ()))
             (if (.hasMoreElements E)
                 (loop (cons (.nextElement E) L))
                 L)))))
     (for-each
      (lambda(x)
        (if (not (isJavadot x))  ;; don't remember javadots!
          (.put ST0 x
               (tryCatch
                (list (.getGlobalValue (string->symbol x)))
                (lambda(e)
                  ())))))
      (enum->list (.keys jsint.Symbol.symbolTable$)))

     (display (length (enum->list (.keys ST0))))(newline)

     (lambda()
       (let ((ST jsint.Symbol.symbolTable$))
         (for-each
          (lambda(x)
            (let ((v (.get ST0 x)))
              (if (equal? #null v)
                (if (not (isJavadot x))
                    (begin (display x)(newline) (.remove ST x)))
                (let ((s (string->symbol x)))
                   (.put ST x s)
                   (if (not (null? v))
                    (.setGlobalValue s (first v)))))))
          (enum->list (.keys ST)))))))

[Jscheme-devel] Re: JScheme SchemeApplet - UC WISE Citris Project

[Dazhi L. <da...@uc...>]

Hi Timothy,

Thank you for asking! Actually it went pretty well.

We rewrote part of that EditArea component so it does basic paren
matching and indenting, enough for a listener. Since our project
requires a more sophisticated Scheme editor, which should be able to do
syntax highlighting, custmizable indenting and find/replace etc, we did
this with Swing. So a jseditor module is added to the project, which can
communicate with instances of listeners through a static hashtable
(AppletStore).

Our latest working version and source can be found at:
http://wiser.cs.berkeley.edu/citris/darrel/jscheme/

BTW, a quick question: After user program in JScheme for a while, is
there an easy way to erase all user defined bindings, that is, to return
to the initial state of JScheme?

I'll take a look at your link. But since I'm graduating and sort of
finishing up my work on this project, I may not have time to switch to a
different implementation.

Darrel


Timothy Hickey wrote:

> Hi Darrel,
>
> How has your Scheme interpreter applet project for WISE been
> progressing lately?
>
> I recently checked in a new Scheme Interpereter applet
> that you might be interested in. It should run in all browsers
>
> http://www.cs.brandeis.edu/~tim/jscheme/src/jlib/demo/SchemeEval.html
>
> and it does "paren matching" and auto-indenting.
>
> Since "flashing" parens is fairly difficult to implement in Java 1.1,
> this applet has an extra textarea showing the most recently
> matched complete expression. It is implemented entirely in
> Scheme with no additional Java classes needed.
>
> Please feel free to "steal" anything you want from the code,
> it is open-source with zlib/png licensing (the most open of
> the open-source licenses).
>
> We hope to add a "reformat" button, that will auto-indent every
> line of the file. Also, improved error reporting would be
> helpful especially for pedagogical purposes. For Java 1.2+
> applets (or Java Web Start), we can use Swing highlighting
> for paren matching....
>
> ----Tim---

[Jscheme-devel] Re: JScheme SchemeApplet - UC WISE Citris Project

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

Hi Darrel,

How has your Scheme interpreter applet project  for WISE been
progressing lately?

I recently checked in a new Scheme Interpereter applet
that you might be interested in. It should run in all browsers

    http://www.cs.brandeis.edu/~tim/jscheme/src/jlib/demo/SchemeEval.html

and it does "paren matching" and auto-indenting.

Since "flashing" parens is fairly difficult to implement in Java 1.1,
this applet has an extra textarea showing the most recently
matched complete expression. It is implemented entirely in
Scheme with no additional Java classes needed.

Please feel free to "steal" anything you want from the code,
it is open-source with zlib/png licensing (the most open of
the open-source licenses).

We hope to add a "reformat" button, that will auto-indent every
line of the file. Also, improved error reporting would be
helpful especially for pedagogical purposes. For Java 1.2+
applets (or Java Web Start), we can use Swing highlighting
for paren matching....

----Tim---






On Saturday, March 30, 2002, at 12:33 AM, Dazhi Liu wrote:

> Hi,
>
> I've downloaded the latest JScheme and finally had the applet compiled
> under JDK 1.3.1_03 and run under both IE and Netscape 4.x. The problem
> seemed to be that JDK 1.4 compiled a version that's imcompatible with
> previous versions of JVM.
>
> Thank you for all your help.
>
> Best regards,
> Darrel
>
>

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jlib/demo
In directory usw-pr-cvs1:/tmp/cvs-serv24541

Modified Files:
	SchemeEval.scm 
Log Message:
dumbed down menuitem so it runs as Java 1.1 applet

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jlib/demo
In directory usw-pr-cvs1:/tmp/cvs-serv13916

Added Files:
	SchemeEval.html SchemeEval.scm 
Log Message:
new version of Scheme interpreter with paren matching/indenting and stop button

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/dclass
In directory usw-pr-cvs1:/tmp/cvs-serv11968

Modified Files:
	dclass.scm 
Log Message:
Fix a { problem.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/webapp/jscheme/WEB-INF/lib
In directory usw-pr-cvs1:/tmp/cvs-serv24318/src/webapp/jscheme/WEB-INF/lib

Removed Files:
	jschemewebapp.jar 
Log Message:
modified quasi-strings to flatten embedded scheme terms before appending to string, bumped version number to 5.1

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/webapp/jscheme/lib
In directory usw-pr-cvs1:/tmp/cvs-serv24318/src/webapp/jscheme/lib

Removed Files:
	applet.jar snlp.jar 
Log Message:
modified quasi-strings to flatten embedded scheme terms before appending to string, bumped version number to 5.1

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jsint
In directory usw-pr-cvs1:/tmp/cvs-serv24318/src/jsint

Modified Files:
	InputPort.java Primitive.java Scheme.java primproc.scm 
Log Message:
modified quasi-strings to flatten embedded scheme terms before appending to string, bumped version number to 5.1

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/doc
In directory usw-pr-cvs1:/tmp/cvs-serv24318/doc

Modified Files:
	whatsnew.html 
Log Message:
modified quasi-strings to flatten embedded scheme terms before appending to string, bumped version number to 5.1

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme
In directory usw-pr-cvs1:/tmp/cvs-serv5229

Modified Files:
	mainwebpage.html 
Log Message:
fixed broken link to licence

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme
In directory usw-pr-cvs1:/tmp/cvs-serv23351

Modified Files:
	mainwebpage.html 
Log Message:
fixed broken links

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/doc
In directory usw-pr-cvs1:/tmp/cvs-serv23351/doc

Modified Files:
	webapp.html 
Log Message:
fixed broken links

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jlib/demo
In directory usw-pr-cvs1:/tmp/cvs-serv766/src/jlib/demo

Modified Files:
	jschemeint.scm 
Log Message:
Leave comment for Tim.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme
In directory usw-pr-cvs1:/tmp/cvs-serv485

Modified Files:
	mainwebpage.html 
Log Message:
Trim down the front page even more.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/lib
In directory usw-pr-cvs1:/tmp/cvs-serv10251

Modified Files:
	servlet.jar 
Log Message:
Recheckin servlet.jar

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jsint
In directory usw-pr-cvs1:/tmp/cvs-serv19790

Removed Files:
	Listener.java Listener11.java Listener11swing.java 
Log Message:
Remove Listener*.java.  They get built automatically.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jsint
In directory usw-pr-cvs1:/tmp/cvs-serv7587/src/jsint

Modified Files:
	Listener.java Listener11.java Listener11swing.java 
	listener.scm 
Log Message:
Be more careful about building Listeners.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/build
In directory usw-pr-cvs1:/tmp/cvs-serv7587/src/build

Modified Files:
	jscheme-bootstrap.scm 
Log Message:
Be more careful about building Listeners.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jscheme
In directory usw-pr-cvs1:/tmp/cvs-serv7587/src/jscheme

Modified Files:
	REPL.java 
Log Message:
Be more careful about building Listeners.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/elf
In directory usw-pr-cvs1:/tmp/cvs-serv30330

Modified Files:
	classpath.scm 
Log Message:
Remove a silk reference.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/src/jsint
In directory usw-pr-cvs1:/tmp/cvs-serv28765

Modified Files:
	Invoke.java 
Log Message:
Remove confusing backtraces.

[Jscheme-devel] CVS-update

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

Update of /cvsroot/jscheme/jscheme/doc
In directory usw-pr-cvs1:/tmp/cvs-serv29096/doc

Modified Files:
	userman.html 
Log Message:
revised webpage/documentation