Hi Kathy -
Jess doesn't have a data type that corresponds to 'char', doesn't
recognize "'" as special characters, and doesn't understand escape
sequences except in strings as a way of expressing the escaped
character - i.e., \" . So '\b' is parsed by Jess as a four-character
symbol, quote slash b quote.
So, how do you match a JavaBean property of type 'char'? Well, you can
always use a Jess integer; so
(defrule checkBlank
(tRec (code 6))
6 being the ASCII for \b (bell), right?
If the character is printable, you can use either a symbol or a
String, whichever is more appropriate, for example
(defrule checkBlank
(tRec (code a))
(defrule checkBlank
(tRec (code "\"")) // The double-quote character
All of these will work.
I think Kathy Lee Simunich wrote:
>
> How would one pattern match a blank character? Would you use the
> c-syntax
> for blank and other white space as shown below? Compiling the code
> below
> returns TRUE, but I can only test it by asserting tRec (code '\b') which
> of
> course matches, but is that how it is received from Java?
> The java object for tRec (using defclass instead of the
> deftemplate below), has code defined as a char, where
> it is initialized to ' '. Should the rule below match correctly?
>
> (deftemplate tRec
> (slot code))
> (defrule checkBlank
> (tRec (code '\b')) <===does this work?
> =>
> (printout t "code is blank" crlf))
>
> Thanks,
> Kathy Lee Simunich
> Argonne National Lab
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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