[rules-users] MVEL parsing / keyword conflict

[Edson Tirelli]

   Simon,

   Can you show us what syntax are you trying?

   []s
   Edson

2009/8/5 Simon Thum <simon.thum at gmx.de>

> Hi all,
>
> I've stumbled on some mvel integration issues in 5.0.1. I'm using drools
> to do, among others, spatial reasoning. At insertion time I maintain a
> specialized index, which can be queried later using [collect] from. This
> works fine in general.
>
> However, as soon as I use the mvel 2 projections a.k.a. 'in' keyword,
> hell breaks loose. 'in' is described here:
> http://mvel.codehaus.org/MVEL+2.0+Projections+and+Folds
>
> But I only seem to get syntax errors. If it is possible, to somehow
> escape keywords or explicitly pipe through the mvel part, please let me
> know!
>
> Needless to say, this feature would be great to have since my object
> model is mainly fixed and 'is' allows me to compensate that. Worse, I'd
> need to assert objects I don't want to assert to work around.
>
> I tried parenthesizing, only to discover that
> ... from valid_stmt
>
> is fine, but
>
> ... from (valid_stmt)
>
> won't work either. Error 101, reason unknown, but it doesn't even make
> it through the parser.
>
> I'd really appreciate to be given an idea why what I did went wrong.
> Googling around didn't get me too far.
>
> Cheers,
>
> Simon
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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