[rules-dev] [Bug]: 5.5.0: binding makes parser accept non-boolean constraint

[Wolfgang Laun]

I guess I've always spoken my mind in favour of a clean syntax, even
if it means a little extra typing. I dislike expressions with internal
bindings; the traditional binding at the start of an expression is
sufficient.

Cheers
Wolfgang

On 18/02/2013, Edson Tirelli <ed.tirelli at gmail.com> wrote:
>    Wolfgang,
>
>    Thank you for reporting. Mario is fixing it.
>
>    On a related note, for Drools 5, for backward compatibility, we still
> allowed bindings in the middle of expressions. We were discussing if this
> should be disallowed from Drools 6 forward? Things like:
>
> Person( $name : name == "Bob" || $alive : isAlive && ($age : age > 40 ) )
>
>    Things get quite complicated and a bit hard to read as expressions get
> more complex. It also clashes with the ternary operator ?:.
>
>    Any thoughts on retaining support for this kind of syntax or removing
> it?
>
>    Edson
>
> On Mon, Feb 18, 2013 at 7:45 AM, Wolfgang Laun
> <wolfgang.laun at gmail.com>wrote:
>
>> Below is a self-contained DRL which should not compile because the sum
>> isn't a boolean expression. (Note that omitting "$x:" results in the
>> correct diagnostic "predicate ... must be a boolean".)
>>
>> declare Foo
>>   a: double
>>   b: double
>> end
>>
>> rule what
>> when
>>     $c: Foo( $x: a + b )
>> then
>>     System.out.println( "foo: " + $c );
>> end
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>
>
>
> --
>   Edson Tirelli
>   JBoss Drools Core Development
>   JBoss by Red Hat @ www.jboss.com
>