I tried a few permutations with 5.1.x

Nested infix appears to have a few problems, as you describe (although your last example is incomplete); e.g.:-

rule "Unknown error while parsing. This is a bug. Please contact the Development team."
when
(or 
  (
  or Fact( ) Fact( )
  )
  Fact() 
)
then
  //Something
end 

Non-nested infix looked OK:-

rule "compiles OK - 1"
when
(or Fact( ) Fact( ) Fact()) 
then
  //Something
end 

Post-fix appears OK:-

rule "compiles OK - 2"
when
(
    Fact() or 
    Fact()
) or 
Fact() 
then
  //Something
end

Based on my limited test it appears to be a bug and my advice would be to raise a JIRA.

As a work around you can change your rules in post-fix notation.

With kind regards,

Mike

 
On 26 October 2010 11:09, Swindells, Thomas <TSwindells@nds.com> wrote:
What are you actually trying to achieve?
It would probably be a lot cleaner and better just to write these as separate rules - one for each case you want to consider.

Thomas

> -----Original Message-----
> From: rules-users-bounces@lists.jboss.org [mailto:rules-users-
> bounces@lists.jboss.org] On Behalf Of chrbonte
> Sent: 26 October 2010 10:52
> To: rules-users@lists.jboss.org
> Subject: [rules-users] no viable alternative at input 'or'
>
>
> Hi
>
> I'm struggling with the rule syntax. I took over this drools project of a
> collegue who left the company and am struggling with a bug in our
> application.
>
> The following works:
>
> rule "cbo2"
> when
> (or
> Patient(sex == "F")
> Patient(sex == "")
> )
> then
> ...
> end
>
> What doesn't work is the following:
>
> rule "cbo"
> when
> (or
>       (or
>               Patient(sex == "F")
>               Patient(age > 2)
>       )
>       Patient(sex == "")
> )
> then
> ...
> end
>
> AND
>
> rule "cbo"
> when
> (or
>       (or
>               Patient(sex == "F")
>               Patient(age > 2)
>       )
> )
> then
> ...
> end
>
> -------------------
>
> Can someone please point me in the right direction or explain to me why I
> get "no viable alternative at input 'or' with the last 2 examples?
>
> Regards
> Christophe
> --
> View this message in context: http://drools-java-rules-
> engine.46999.n3.nabble.com/no-viable-alternative-at-input-or-
> tp1772702p1772702.html
> Sent from the Drools - User mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users


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