If you rely heavily on enums, you might consider using a userfunction that binds enum constants to Jess variables - so you don't need the parentheses.
http://www.jessrules.com/jesswiki/view?BindEnumUserFunction -W On 12/03/2012, Friedman-Hill, Ernest <ejfr...@sandia.gov> wrote: > The Jess language is not Java, it's Lisp by design, and parentheses just > work differently. All functions calls look like (fooFunction a b c), and if > there's no arguments, it's just (fooFunction). There are never parentheses > just surrounding the arguments. > > For using enums, look here: > http://www.jessrules.com/jesswiki/view?EnumeratedTypes . The upshot is that > "import" will defined some functions for you which return the enum's values; > to get the value, you have to call the function. So there's one more set of > parentheses: > > ((UnitType$UnitTypes.Terran_Supply_Depot) ordinal) > > > > From: Hunter McMillen <mcmil...@gmail.com<mailto:mcmil...@gmail.com>> > Reply-To: <jess-users@sandia.gov<mailto:jess-users@sandia.gov>> > Date: Mon, 12 Mar 2012 15:59:45 -0400 > To: <jess-users@sandia.gov<mailto:jess-users@sandia.gov>> > Subject: Re: JESS: [EXTERNAL] Jess exception: ' ' is a list, not a string > > That was exactly the problem, thanks. What is the general rule for function > calling in Jess, always without parentheses? I never would have caught that > error because when I see something like get-next-build-tile() the > parentheses tell me it is a function. Seeing it without the parens makes me > think it is a variable, even without the ? sign is front. > > Also, as a corollary question; I am using an enumerated type in my rule: > > (import eisbot.proxy.types.UnitType$UnitTypes) > > (defrule build-supply-depot > (minerals (value ?x&:(> ?x 100))) > => > (try > (foreach ?u (?*bwapi* getMyUnits) > (if (= (?u getTypeID) ?*SCV_ID*) then > (bind ?p (call get-next-build-tile())) > (call ?*bwapi* drawCircle ?p.x ?p.y 100 111 FALSE FALSE) > (call ?*bwapi* build (?u getID) ?p.x ?p.y > (UnitType$UnitTypes.Terran_Supply_Depot ordinal)) > (break))) > catch > (printout t (call ?ERROR toString) crlf) > ) > ) > > But after importing when my rule tries to execute the bolded line above, I > get a class not found exception: > > Message: Class not found. > at jess.dx.call(Unknown Source) > at jess.ac.a(Unknown Source) > at jess.Funcall.execute(Unknown Source) > at jess.FuncallValue.resolveValue(Unknown Source) > at jess.dx.call(Unknown Source) > at jess.ac.a(Unknown Source) > at jess.Funcall.execute(Unknown Source) > at jess.FuncallValue.resolveValue(Unknown Source) > at jess.f4.call(Unknown Source) > at jess.ac.a(Unknown Source) > at jess.Funcall.execute(Unknown Source) > at jess.FuncallValue.resolveValue(Unknown Source) > at jess.cu.a(Unknown Source) > at jess.cu.call(Unknown Source) > at jess.ac.a(Unknown Source) > at jess.Funcall.execute(Unknown Source) > at jess.Defrule.a(Unknown Source) > at jess.Activation.a(Unknown Source) > at jess.en.a(Unknown Source) > at jess.en.a(Unknown Source) > at jess.Rete.if(Unknown Source) > at jess.Rete.run(Unknown Source) > at hunterai.HunterAIClient.gameUpdate(HunterAIClient.java:156) > at eisbot.proxy.JNIBWAPI.gameUpdate(JNIBWAPI.java:795) > at eisbot.proxy.JNIBWAPI.startClient(Native Method) > at eisbot.proxy.JNIBWAPI.start(JNIBWAPI.java:597) > at hunterai.HunterAIClient.start(HunterAIClient.java:102) > at hunterai.HunterAIClient.main(HunterAIClient.java:42) > Caused by: java.lang.ClassNotFoundException: new > at java.net.URLClassLoader$1.run(Unknown Source) > at java.net.URLClassLoader$1.run(Unknown Source) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(Unknown Source) > at java.lang.ClassLoader.loadClass(Unknown Source) > at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) > at java.lang.ClassLoader.loadClass(Unknown Source) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Unknown Source) > at jess.dc.for(Unknown Source) > at jess.dc.if(Unknown Source) > at jess.Rete.findClass(Unknown Source) > ... 28 more > > any ideas? > > Hunter > > > > > On Mon, Mar 12, 2012 at 1:48 PM, Friedman-Hill, Ernest > <ejfr...@sandia.gov<mailto:ejfr...@sandia.gov>> wrote: > OK, I looked in the magic decoder file and I see a "call" being invoked > inside a "bind", so that fits only the line of code below. And lo and > behold, look at it: the second argument to "call", which should be the name > of the function to call, is a pair of empty parentheses — i.e., a list. This > line is asking Jess to to call the static method named "()" on the class > named "get-next-build-tile" -- surely not what you intended. If you're just > calling a deffunction by this name, then you just want > > (bind ?p (get-next-build-tile)) > > From: Hunter McMillen <mcmil...@gmail.com<mailto:mcmil...@gmail.com>> > Reply-To: <jess-users@sandia.gov<mailto:jess-users@sandia.gov>> > Date: Mon, 12 Mar 2012 12:16:29 -0400 > To: <jess-users@sandia.gov<mailto:jess-users@sandia.gov>> > Subject: Re: JESS: [EXTERNAL] Jess exception: ' ' is a list, not a string > > (bind ?p (call get-next-build-tile())) > > > -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users y...@address.com' in the BODY of a message to majord...@sandia.gov, NOT to the list (use your own address!) List problems? Notify owner-jess-us...@sandia.gov. --------------------------------------------------------------------
