[rules-users] no viable alternative at input 'or'

[Swindells, Thomas]

Why not just have the following?

 rule "cboFemale"
 when
    Patient(sex == "F")
then
...
end.

rule "cboNotBaby"
 when
    Patient(age > 2)
then
...
end.

rule "cboNoSex"
 when
    Patient(sex == "F")
then
...
end.

This has the advantage that rule auditing will identify which condition matches and means that you can use the binding in the rule.
Alternatively you should be able to do

rule "cbo"
 when
    Patient(sex == "F" or sex == "" or age > 2)
then
...
end.




From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Michael Anstis
Sent: 26 October 2010 11:56
To: Rules Users List
Subject: Re: [rules-users] no viable alternative at input 'or'

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 at nds.com<mailto:TSwindells at 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 at lists.jboss.org<mailto:rules-users-bounces at lists.jboss.org> [mailto:rules-users-<mailto:rules-users->
> bounces at lists.jboss.org<mailto:bounces at lists.jboss.org>] On Behalf Of chrbonte
> Sent: 26 October 2010 10:52
> To: rules-users at lists.jboss.org<mailto:rules-users at 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-<http://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 at lists.jboss.org<mailto:rules-users at lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users

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