On Feb 20, 2008, at 9:15 AM, Henrique Lopes Cardoso wrote:
There is a small bug in the 'actually-remove-things-from-c' rule:
(remove ?c ?b?) should be (remove ?c ?x)
Thanks, yes.
Anyway, is 'do-something-when-something-gets-removed-from-c'
guaranteed
to fire? If 'actually-remove-things-from-c' fires before, then
'do-something-when-something-gets-removed-from-c' will not fire, since
?c was already modified!
Indeed. Probably should be more like
(defrule do-something-when-something-gets-removed-from-c
"This is the rule you were asking about how to write"
?c <- (C)
(remove ?c ?x)
=>
(do whatever you want to do here))
Henrique
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:owner-jess-
[EMAIL PROTECTED]
On Behalf Of Ernest Friedman-Hill
Sent: woensdag 20 februari 2008 13:31
To: jess-users
Subject: Re: JESS: Rules for detecting changes of a multislot
Lars,
...
(defrule remove-something-from-c
?c <- (C (m ?a ?b ?c))
=>
(modify ?c (m ?a ?c)))
You'd say something like
(defrule want-to-remove-something-from-c
?c <- (C (m ?a ?b ?c))
=>
;; Instead of modifying ?c, issue a command to do so
(assert (remove ?c ?b)))
(defrule actually-remove-things-from-c
"Process commands to remove items from multislot m of C facts"
(declare (no-loop TRUE))
?c <- (C (m $?first ?x $?rest))
(remove ?c ?b)
=>
(modify ?c (m $?first $?rest)))
(defrule do-something-when-something-gets-removed-from-c
"This is the rule you were asking about how to write"
?c <- (C (m $?first ?x $?last))
(remove ?c ?x)
=>
(do whatever you want to do here))
(defrule clean-up-remove-commands
"A low salience rule to clean up remove commands when you're
done
with them."
(declare (salience -1))
?r <- (remove ? ?)
=>
(retract ?r))
...
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Ernest Friedman-Hill
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Sandia National Labs FAX: (925) 294-2234
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