something like (assert (expression A OR [ B AND C ]))
should work.
Of course, your rules should look like :
(defrule test
?exp <- (expression ?x ?op1 [ ?y ?op2 ?z ])
=>
action
The point is that [ are not a part of the Jess language. ( and ) are.
Emmanuel L�charny, IKTEK
06 08 33 32 61, www.iktek.com <http://www.iktek.com>
-----Message d'origine-----
De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]De
la part de Daniel Carrier
Envoy� : lundi 30 avril 2001 18:19
� : [EMAIL PROTECTED]
Objet : JESS: Parenthesis support in rules
Hi, I'm currently working with Jess to implement a boolean expression
reduction application. All is going well but now I am stuck with those
parenthesis. The thing is, i've built my rules like so :
(defrule some-rule
?some-rule <- (expression ?x ?op ?z)
=>
action)
Which are supposed to work ( and they do! ) with facts entered like this
(assert ( expression A AND B)).
Problem is, if i want to incorporate rules to simulate say distributivity,
then, if i keep the same structure i have now, i would get:
(assert (expression A OR (A AND B)))
(defrule some-rule
?some-rule <- (expression ?x ?op1 (?y ?op2 ?z))
=>
action)
but (?y ?op2 ?z) would not match with anything and is even interpreted as
being a function call. I am considering integrating another token in the
assert and rule to change it to
(assert (expression A OR (sub-exp A AND B)))
(defrule some-rule
?some-rule <- (expression ?x ?op1 (sub-exp ?y ?op2 ?z))
=>
action)
so it can be interpreted as being a fact and not a function call. What i am
wondering is if it couldn't be done in another way? I find this "sub-exp"
addition to be quite annoying ( in my application's context ) and will
require me to add some processing time which i would like to bypass.
Anyone can help me?
Daniel Carrier
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