Re: [Jython-users] Use of eval

[Neil B. <nei...@zi...>]

Hello,
 
            Whoops, no I didn't have it working - ran the wrong test
(bit tired that day).  The issue is that I can't use
objInterp.exec(strScript) as exec doesn't return an object - it just
returns void.  The current way I have to do register a return value,
tell the user to set the result to that value, get it out and then
deregister that value inside my script.  That works but it is very
different for the user as they have to do thing differently when coding
Jython extensions to the system than a ruby extension (haven't tried
groovy yet).
 
            From what I can see - I'm stuck here, can anyone point me to
a potential solution (I'm fairly experienced in CPython as I use it in
my day job and code Java in the evening - contrary to most people ;) )?
 
            Thanks, in advance for your help.
 
Cheers,
 
Neil
---
Neil Benn
CEO Ziath Ltd
http://www.ziath.com
 
-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...] On Behalf Of
Sidharth Kuruvila
Sent: 04 December 2006 22:53
To: jyt...@li...
Subject: Re: [Jython-users] Use of eval
 
Hi Ben,
 
eval is meant for expressions. What you want to use is exec
 
Object objResult = objInterp.exec(strScript);
 
 
On 05-Dec-06, at 2:48 AM, Neil Benn wrote:



Hello,
 
            I am trying to evaluate a script which runs as follows
(using both BSF and JYthonInterp does the same thing):
 
---
 
String strScript = "def test():\n";
strScript += "\treturn 1\n";
strScript += "test()";
 
Object objResult = objInterp.eval(strScript);
 
---
 
However I get the following traceback (this is when run from
JythonInterp), I've snipped the bottom bit off because it is in the unit
test code
 
            Traceback (innermost last):
  (no code object) at line 0
SyntaxError: ('invalid syntax', ('<string>', 1, 1, 'def test():'))
 
            at org.python.core.parser.fixParseError(parser.java)
            at org.python.core.parser.parse(parser.java)
            at org.python.core.Py.compile_flags(Py.java)
            at org.python.core.Py.compile_flags(Py.java)
            at org.python.core.__builtin__.eval(__builtin__.java)
            at org.python.core.__builtin__.eval(__builtin__.java)

            at
org.python.util.PythonInterpreter.eval(PythonInterpreter.java)
            at
uk.co.ziath.datapaq.server.scripting.JythonScriptProcessor.evaluateScrip
t(JythonScriptProcessor.java:76)
            at
uk.co.ziath.datapaq.server.scripting.test.JythonScriptProcessorTest.test
MethodJythonScript(JythonScriptProcessorTest.java:75)
<snip>
 
---
 
            When I attempt to run a simple script such as 3* 4 and
evaluate it, I get back 12 as I would expect.  However it seems that any
multi-line script fails on me.  Is it true that I cannot use a
multi-line script in an evaluate statement (I know I can do it in an
execute statement)?
 
            Thanks for your help.
 
Cheers,
 
Neil
 
 
---
Neil Benn
CEO Ziath Ltd
http://www.ziath.com
 
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