[rules-users] Adding constraints to facts in DSL

[Edson Tirelli]

   All,

   This is a limitation of the current DSL engine implementation. The
problem is not really the "or", but the "-" implementation. The LHS and RHS
of a DSL rule are processed line by line, so, to allow the behavior you are
requesting, we will need to implement some look ahead mechanism with smart
interpolation that does not exist today.
   I'm not sure if someone already opened a ticket for that, but in case
not, may I ask you please to open? We will look into supporting that in the
future.

   []s
   Edson


2007/9/12, Andy Mei <andy.d.mei at gmail.com>:
>
> I am having the same problem as Stephane does.
>
> It's pretty bad if I need to hard code the 'or' constraint within a single
> DSL constraint.  I guess I could split a complex OR constraint to multiple
> rules with the same consequences, it just an ugly hack.  Also, how does this
> work if we need a Or constraint within another group constraint?
>
> I just don't understand why the following doesn't work.
>
> [condition][]There is a Cheese with=Cheese()
> [condition][]- age is less than {low} =age < {low}
> [condition][]Or=or
> [condition][]- age is more than {high}=age > {high}
>
> On 9/11/07, stephane.remillieux at agysoft.fr <
> stephane.remillieux at agysoft.fr> wrote:
>
> > Hi Vincent,
> >
> > Thanks for your answer but I would really like to use my synthax.
> >
> > I need to write "or" between 2 constraints and not in a single complex
> > constraint.
> >
> > If someone else could help me ...
> >
> > DELBART Vincent <delbart.v at mipih.fr> a écrit :
> >
> >
> > > Hello Stephane,
> > >
> > > I think it's difficult to do that. Could you try this :
> > > There is a Cheese with
> > >        - age is less than 42 or age is more than 60
> > >        - type is 'stilton'
> > > with in your DSL
> > > [condition][]There is a Cheese with=Cheese()
> > > [condition][]- age is less than {low} or age is more than {high}=age
> > > < {low} || age > {high}
> > > [condition][]- type is '{type}'=type == "{type}"
> > >
> > > I don't see other solution...
> > >
> > > vdelbart
> > >
> > >
> > >
> > > ________________________________
> > >
> > > De : rules-users-bounces at lists.jboss.org
> > > [mailto:rules-users-bounces at lists.jboss.org] De la part de
> > > stephane.remillieux at agysoft.fr
> > > Envoyé : mardi 11 septembre 2007 10:16
> > > À : rules-users at lists.jboss.org
> > > Objet : [rules-users] Adding constraints to facts in DSL
> > >
> > >
> > >
> > > Hello,
> > >
> > > I'm using JBossDrools in my company and I have some problems with DSL.
> > >
> > > Actually, I would like to write something like this :
> > >
> > > There is a Cheese with
> > >        ( - age is less
> > > than 42
> > >                 or
> > >         -  age is more than 60 )
> > >        - type is
> > > 'stilton'
> > >
> > > Unfortunately, It's the drools parser which manage "-" char.
> > >
> > > Also this previous synthax don't work in the LHS.
> > >
> > > Anyone could help me to do an equivalent condition in my DSL ? If
> > > possible with "-" sugar char.
> > >
> > > Stephane.
> > >
> > > PS : Sorry, for my very bad english.
> > >
> > >
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> > >
> > >
> >
> >
> >
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> >
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> >
> >
>
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-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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