Re: Evaluate complex conditions

_______________________
Booth Martin
Booth@MartinVT.com
http://www.MartinVT.com
_______________________




Terry Grider <tgrider@arkansas.net>
Sent by: owner-midrange-l@midrange.com
10/23/2000 04:37 PM
Please respond to MIDRANGE-L

 
        To:     MIDRANGE-L@midrange.com
        cc: 
        Subject:        Re: Evaluate complex conditions

You're on the right track Booth except I'm not brave enough to allow TOTAL
english syntax.  I was just hoping to be able to provide simple = , not=, 
<, >,
not>, not<  type compares between field names and literal values, which I 
have
coded for and have working at this point, but only with simple single 
level
conditions connected by a series of either 'ANDs' or 'ORs'.  Naturally, 
first
time a user wanted to try out my little query tool, they needed support 
for
complex, multi-level conditions.  Isn't that always the way it goes!

booth@martinvt.com wrote:

> Oh man, I think it just dawned on me what he's asking for:
>
> You want to give users a long field to type into, and have them type a
> question which you will then parse and assemble into a useable RPGIV
> calculation?   For example, something like
>
> "List everyone that lives in Springfield, owes us money, and hasn't 
bought
> anything for 94 days.   By the way, they have to live in Missouri,
> Illinois, or Canada.  Include their address and phone number on the 
list.
> List last name first, in order by area code and exchange."
>
> That sort of thing?
>
> _______________________
> Booth Martin
> Booth@MartinVT.com
> http://www.MartinVT.com
> _______________________
>
> D.BALE@handleman.com
> Sent by: owner-midrange-l@midrange.com
> 10/23/2000 01:50 PM
> Please respond to MIDRANGE-L
>
>
>         To:     MIDRANGE-L@midrange.com
>         cc:
>         Subject:        Re: Evaluate complex conditions
>
> You mean like:
>
>      c                   Eval      Truth = a = b and (c = d or c = e or 
c
> = f)
>
> Ya, sure, RPG-IV!
>
> Dan Bale
> IT - AS/400
> Handleman Company
> 248-362-4400  Ext. 4952
>
> -------------------------- Original Message --------------------------
> Sorry guys,  I didn't do a very good job of explaining what I was 
looking
> for.
> I don't mean I want code that is an example of testing for complex
> conditions,
>  I
> mean I'm looking for code that will evaluate statements like the one in 
my
> original example and determine the truth of the statement.  You see, I'm
>  writing
> a query tool and I want the user to be able to provide selection 
criteria
> in
>  an
> english style IF format similar to cobol or other query tools I've seen. 
I
>  can
> currently handle simple criteria with "and/or" connectors, but I can't
> seem to
> come up with a good method for handling multiple levels of parenthesis.
>
> Terry Grider wrote:
>
> > Has anyone ever written or seen an example of program code designed to
> > evaluate complex conditions?  For example, if you wanted to evaluate a 
=
> > b and (c = d or c = e or c = f).  I'm looking for something that can 
do
> > multiple levels of parenthesis and all "and/or" combinations.
> >
> > --
> > Terry Grider
> > tgrider@arkansas.net
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--
Terry Grider
tgrider@arkansas.net


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