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From "Peter Reilly" <>
Subject Re: <scriptcondition> is broken with Jython in the recent trunk builds
Date Tue, 31 Jul 2007 15:34:33 GMT
For BSF there are two methods to run a script:
  eval and exec,

In ant 1.6.* the only method supported was exec. Hence all
the <script*> types called methods on self to set the return

For ant 1.7.0, I modified the scripting code to allow access to
eval and exec, but did not modify any calling types to use
eval rather than exec. (In fact I did not test the eval on anything)
I placed it here to allow expression handling from property callbacks
- something like <if test='${groovy: abc == "abc"}"> ..., but did
not follow up.

I assume that jython does not like a new line in its expression.

one can in python do
a = 1
if a > 0:
   b = 2
however, one cannot do
if #
  a > 0:

So I think that this is a clear case of BC problem.
It would be nearly impossible to use <scriptcondition> with
jythton in it's current state.

(I cannot test at the moment due to (bsf/log4j/commons
logging/jython.jar issues)


On 7/31/07, Dominique Devienne <> wrote:
> On 7/31/07, Matt Benson <> wrote:
> > <scriptcondition> originally behaved such that a
> > default value can be declared on the task as an
> > attribute, and the embedded script can set the
> > condition value.  I preserved this behavior, but added
> > a preference for a return value, if any, from the
> > script:  again, on the basis that this seemed a (more)
> > natural behavior to me.  DD, you said "not returning a
> > value is fine by you"... and that's what
> > <scriptcondition> always did, and _should_ still
> > allow... am _I_ missing anything (other than whatever
> > I've apparently done to break python compatibility)?
> Ah, sorry, I meant that "not returning a value is meaningless to me".
> Sure, if a default value for the condition is set as an attribute, why
> not (although I don't see why that's necessary or useful), but a
> scriptcondition is supposed to be a script fragment which returns a
> boolean value, and I don't see the point of not returning a value.
> --DD
> PS: The error message could be nicer though ;-)
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