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Posted to bsf-user@jakarta.apache.org by Neil Benn <ne...@ziath.com> on 2006/06/06 21:48:22 UTC
Usage of Eval
Hello,
I am working with BSF and Jython (I'll move onto other
languages later - it's just the Jython/Python is the scriptng language I
am most used to). I'm trying to implement a simple script to run a
method and get the result such as:
---
def test():
return 1
test()
---
I was hoping that when I eval that using:
---
public void testRawJythonScript(){
String strScript = "def test():\n";
strScript += "\treturn 1\n";
strScript += "test()\n";
BSFManager objBM = new BSFManager();
try{
Object objResult = objBM.eval("Jython", null, 0,
0, strScript);
System.out.println(objResult);
}catch (BSFException eBSF){
eBSF.printStackTrace();
fail(eBSF.getMessage());
}
}
---
I would get the number 1 back (well in a PyObject but still 1).
However I get an exception:
---
junit.framework.AssertionFailedError: exception from Jython: Traceback
(innermost last):
(no code object) at line 0
File "<string>", line 1
def test():
^
SyntaxError: invalid syntax
at junit.framework.Assert.fail(Assert.java:47)
at
uk.co.ziath.datapaq.server.scripting.test.BSFScriptProcessorTest.testRaw
JythonScript(BSFScriptProcessorTest.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown
Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at
junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe
stRunner.java:478)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRun
ner.java:344)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu
nner.java:196)
---
In addition my System.out repeats the top message a few
times, I've tried playing around with a few things but I can't
understand why BSF/Jython thinks this is bad code. I would be eternally
grateful if someone could point me in the right direction! If this is
better asked on the Jython Users board then please let me know - ta.
Thanks in advance.
Cheers,
Neil
Re: Usage of Eval
Posted by "Rony G. Flatscher" <Ro...@wu-wien.ac.at>.
Hi Mario,
> If you want to try...
> http://www.xmoon.org
>
> <task>
> <code language="javascript | ruby | judoscript | beanshell | *jython*">
> Script code here
> </code>
> </task>
would eval() work? Ie. invoking a jython script and have it return a
(function) value with which you could go on working? (Executing a jython
script works.)
BTW, BSF was created *exactly* for the purpose you mention on your page,
so why not join forces?
In the meantime BSF supports at least the following languages:
javascript = org.apache.bsf.engines.javascript.JavaScriptEngine, js
jacl = org.apache.bsf.engines.jacl.JaclEngine, jacl
netrexx = org.apache.bsf.engines.netrexx.NetRexxEngine, nrx
java = org.apache.bsf.engines.java.JavaEngine, java
javaclass = org.apache.bsf.engines.javaclass.JavaClassEngine, class
bml = org.apache.bml.ext.BMLEngine, bml
vbscript = org.apache.bsf.engines.activescript.ActiveScriptEngine, vbs
jscript = org.apache.bsf.engines.activescript.ActiveScriptEngine, jss
perlscript = org.apache.bsf.engines.activescript.ActiveScriptEngine, pls
perl = org.apache.bsf.engines.perl.PerlEngine, pl
jpython = org.apache.bsf.engines.jpython.JPythonEngine, py
jython = org.apache.bsf.engines.jython.JythonEngine, py
lotusscript = org.apache.bsf.engines.lotusscript.LsEngine, lss
xslt = org.apache.bsf.engines.xslt.XSLTEngine, xslt
pnuts = pnuts.ext.PnutsBSFEngine, pnut
beanbasic = org.apache.bsf.engines.beanbasic.BeanBasicEngine, bb
beanshell = bsh.util.BeanShellBSFEngine, bsh
ruby = org.jruby.javasupport.bsf.JRubyEngine, rb
judoscript = com.judoscript.BSFJudoEngine, judo|jud
groovy = org.codehaus.groovy.bsf.GroovyEngine, groovy|gy
objectscript = oscript.bsf.ObjectScriptEngine, os
prolog = ubc.cs.JLog.Extras.BSF.JLogBSFEngine, plog|prolog
rexx = org.rexxla.bsf.engines.rexx.RexxEngine, rex | rexx | cls | rxj | rxs
In addition work has been done for a JSR-223 version of BSF, which will
go in beta once this version of BSF goes Golden.
Regards,
---rony
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Re: Usage of Eval
Posted by Mario Neè <ma...@xmoon.org>.
If you want to try...
http://www.xmoon.org
<task>
<code language="javascript | ruby | judoscript | beanshell | *jython*">
Script code here
</code>
</task>
Neil Benn ha scritto:
> Hello,
>
> I am working with BSF and Jython (I'll move onto other
> languages later - it's just the Jython/Python is the scriptng language I
> am most used to). I'm trying to implement a simple script to run a
> method and get the result such as:
>
> ---
> def test():
> return 1
> test()
>
> ---
>
> I was hoping that when I eval that using:
>
> ---
>
> public void testRawJythonScript(){
> String strScript = "def test():\n";
> strScript += "\treturn 1\n";
> strScript += "test()\n";
> BSFManager objBM = new BSFManager();
> try{
> Object objResult = objBM.eval("Jython", null, 0,
> 0, strScript);
> System.out.println(objResult);
> }catch (BSFException eBSF){
> eBSF.printStackTrace();
> fail(eBSF.getMessage());
> }
> }
>
> ---
>
> I would get the number 1 back (well in a PyObject but still 1).
> However I get an exception:
>
> ---
>
> junit.framework.AssertionFailedError: exception from Jython: Traceback
> (innermost last):
> (no code object) at line 0
> File "<string>", line 1
> def test():
> ^
> SyntaxError: invalid syntax
>
> at junit.framework.Assert.fail(Assert.java:47)
> at
> uk.co.ziath.datapaq.server.scripting.test.BSFScriptProcessorTest.testRaw
> JythonScript(BSFScriptProcessorTest.java:67)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown
> Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
> Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at junit.framework.TestCase.runTest(TestCase.java:154)
> at junit.framework.TestCase.runBare(TestCase.java:127)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at
> junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:118)
> at junit.framework.TestSuite.runTest(TestSuite.java:208)
> at junit.framework.TestSuite.run(TestSuite.java:203)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe
> stRunner.java:478)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRun
> ner.java:344)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu
> nner.java:196)
>
> ---
>
> In addition my System.out repeats the top message a few
> times, I've tried playing around with a few things but I can't
> understand why BSF/Jython thinks this is bad code. I would be eternally
> grateful if someone could point me in the right direction! If this is
> better asked on the Jython Users board then please let me know - ta.
>
> Thanks in advance.
>
> Cheers,
>
> Neil
>
>
--
Mario Nee'
Web Developer
------------------------------
Neex
Via Vanzeghetto, 47
25031 Capriolo (BS) Italia
www.neex.it
------------------------------
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RE: Usage of Eval
Posted by Neil Benn <ne...@ziath.com>.
-----Original Message-----
From: Rony G. Flatscher [mailto:Rony.Flatscher@wu-wien.ac.at]
Sent: 06 June 2006 23:09
To: Bean Scripting Framework users
Subject: Re: Usage of Eval
Hi Neil,
just noticed that using exec() and compile() works, so it is the eval()
(and probably apply()) which poses the problem.
<snip>
Hello,
Sorry for my extended silence - the same error occurs with raw
Jython so it seems that it is a Jython problem rather than a BSF
problem.
Cheers,
Neil
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Re: Usage of Eval
Posted by "Rony G. Flatscher" <Ro...@wu-wien.ac.at>.
Hi Neil,
just noticed that using exec() and compile() works, so it is the eval()
(and probably apply()) which poses the problem.
The following works:
java org.apache.bsf.Main -in test.py -lang jython -mode exec
java org.apache.bsf.Main -in test.py -lang jython -mode compile
Not sure about eval(). Could it be that it expects a compiled jython
program instead (ie. doing a compile and using its result for eval)?
Regards,
---rony
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Re: Usage of Eval
Posted by "Rony G. Flatscher" <Ro...@wu-wien.ac.at>.
Hi Neil,
as you know there are two Python engines available, "jython" and
"jpython" (not that it makes a difference for your problem, but it might
be interesting to know).
Your test program runs nicely standalone, when invoked via the command
line using BSF it bombs as you reported. It seems that the error comes
from jython.
Here's the content of a file named "test.py" containing almost what you
wrote:
------------ cut here ----------
def test ():
return 1
print test()
------------ cut here ----------
It runs flawlessly with Python.
Here are the results of running it via BSF under different versions of Java from the command line (using org.apache.bsf.Main):
using the "jython" engine with Java 3:
------------ cut here ----------
E:\rony\dev\bsf\src\samples\bsf_samples\bsh>java org.apache.bsf.Main -in test.py -lang jython
[ERROR] BSFManager - Exception: <java.security.PrivilegedActionException <<org.apache.bsf.BSFException: exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test ():'))
>>>java.security.PrivilegedActionException: org.apache.bsf.BSFException: exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test ():'))
at org.apache.bsf.engines.jython.JythonEngine.eval(JythonEngine.java:168)
at org.apache.bsf.BSFManager$5.run(BSFManager.java:470)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.bsf.BSFManager.eval(BSFManager.java:467)
at org.apache.bsf.Main.main(Main.java:154)
exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test ():'))
: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
------------ cut here ----------
using the "jpython" engine with Java 3:
------------ cut here ----------
E:\rony\dev\bsf\src\samples\bsf_samples\bsh>java org.apache.bsf.Main -in test.py -lang jpython
Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
[ERROR] BSFManager - Exception: <java.security.PrivilegedActionException <<org.apache.bsf.BSFException: exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
>>>java.security.PrivilegedActionException: org.apache.bsf.BSFException: exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
at org.apache.bsf.engines.jpython.JPythonEngine.eval(JPythonEngine.java:120)
at org.apache.bsf.BSFManager$5.run(BSFManager.java:470)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.bsf.BSFManager.eval(BSFManager.java:467)
at org.apache.bsf.Main.main(Main.java:154)
exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
------------ cut here ----------
using the "jython" engine with Java 4:
------------ cut here ----------
E:\temp\bsf>java org.apache.bsf.Main -in test.py -lang jython
exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test():'))
: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test():
^
SyntaxError: invalid syntax
------------ cut here ----------
using the "jpython" engine with Java 4:
------------ cut here ----------
E:\temp\bsf>java org.apache.bsf.Main -in test.py -lang jpython
Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test():
^
SyntaxError: invalid syntax
exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test():
^
SyntaxError: invalid syntax
: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test():
^
SyntaxError: invalid syntax
------------ cut here ----------
using the "jython" engine with Java 5:
------------ cut here ----------
E:\rony\dev\bsf\src\samples\bsf_samples\bsh>java org.apache.bsf.Main -in test.py -lang jython
Jun 6, 2006 10:27:32 PM org.apache.bsf.BSFManager eval
SEVERE: Exception:
java.security.PrivilegedActionException: org.apache.bsf.BSFException: exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test ():'))
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.bsf.BSFManager.eval(BSFManager.java:467)
at org.apache.bsf.Main.main(Main.java:154)
Caused by: org.apache.bsf.BSFException: exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test ():'))
at org.apache.bsf.engines.jython.JythonEngine.eval(JythonEngine.java:168)
at org.apache.bsf.BSFManager$5.run(BSFManager.java:470)
... 3 more
exception from Jython:
Traceback (innermost last):
(no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test ():'))
: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
------------ cut here ----------
using the "jpython" engine with Java 5:
------------ cut here ----------
E:\rony\dev\bsf\src\samples\bsf_samples\bsh>java org.apache.bsf.Main -in test.py -lang jpython
Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
Jun 6, 2006 10:29:23 PM org.apache.bsf.BSFManager eval
SEVERE: Exception:
java.security.PrivilegedActionException: org.apache.bsf.BSFException: exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.bsf.BSFManager.eval(BSFManager.java:467)
at org.apache.bsf.Main.main(Main.java:154)
Caused by: org.apache.bsf.BSFException: exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
at org.apache.bsf.engines.jpython.JPythonEngine.eval(JPythonEngine.java:120)
at org.apache.bsf.BSFManager$5.run(BSFManager.java:470)
... 3 more
exception from JPython: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
: Traceback (innermost last):
(no code object) at line 0
File "<string>", line 1
def test ():
^
SyntaxError: invalid syntax
------------ cut here ----------
Not sure where the error comes from...
---rony
P.S.: Also tried it with Jython 2.2alpha on Java 4 with the same results...
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Re: Usage of Eval
Posted by "Rony G. Flatscher" <Ro...@wu-wien.ac.at>.
Hi Neil,
maybe you want to look at the source code of the jython and jpython BSF
engines, located at "org.apache.bsf.engines.jython.JythonEngine.java" or
"org.apache.bsf.engines.jpython.JPythonEngine.java". With a little luck
something hits your eye?
Unless the original jython BSF engine implementors look at this list,
you might want to address the www.jython.org developers?
Regards,
---rony
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RE: Usage of Eval
Posted by Neil Benn <ne...@ziath.com>.
Hello,
Sorry the capital J in Jython is a typo from my email client!
<snip>
Object objResult = objBM.eval("Jython", null, 0, 0, strScript);
<snip>
It should be (and is) - 'jython'.
Cheers,
Neil
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