Re: [rules-users] Error in OR rule
This is due to a designed or accidental glitch in the LHS syntax.
An "and" CE may not contain an "or" CE as one of its operands; it
may only contain a *parenthesized *"or" (but all other CEs without
the additional decoration). This means that you must write
(or (and MyFact(id==1)
MyFact(id==2))
( # !
(or MyFact(id==3) MyFact(id==4))
) # !
)
The simplified version from Piotr's post is, of course, preferred.
Sadly, there is more than one discrepancy between the DRL syntax as
presented in
the non-normative syntax diagrams shown in the Drools Expert manual and the
actual syntax as implemented in the DRL.g file.
-W
2010/5/24 Giovanni Motta <mottagio(a)gmail.com>
Hello, i had similar problems with or constructs, and decided to
avoid
them.
Drools expert manual says that or constructs are internally rewritten, i
suppose this mechanism is not fine-tuned.
My 2 cents...
2010/5/24 Piotr Jedrychowski <pjedrychowski(a)proximetry.pl>
Hello.
>
> I have a problem with such a condition after 'when':
> (or (and MyFact(id==1) MyFact(id==2)) (or MyFact(id==3) MyFact(id==4)))
>
> For this condition I got this error:
> errors; [7,41]: [ERR 101] Line 7:41 no viable alternative at input 'or'
> in rule "Sensor-1-ON"[7,64]: [ERR 102] Line 7:64 mismatched input
> 'MyFact' expecting ')' in rule "Sensor-1-ON"[7,84]: [ERR
102] Line 7:84
> mismatched input ')' expecting 'then' in rule
"Sensor-1-ON"
>
> When I changed my condition to this:
> (or (and MyFact(id==1) MyFact(id==2)) MyFact(id==3) MyFact(id==4))
> everything is correct. Both conditions from logic point of view, are the
> same, but the first one can't be compiled. Why?
>
> Maybe someone had similar problem and could help me?
>
> I'm using:
> * JBoss 4.2.3.GA
> * Drools 5.0
>
> Regards,
> Piotr
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