Re: Evaluate complex conditions

[Terry Grider <tgrider@xxxxxxxxxxxx>]

That's a good question.  My particular situation is complicated further by the
fact that the variables in question are not specifically known to the program by
their field names.  My query tool reads the source copy books (in this case
cobol) and dynamically resolves the data location, length and format of all the
fields and determines what file they come from. A table is built that contains
the selection criteria consisting of the field's name, location and format.  The
program must get the data using the information from the table and resolve the
selection criteria using work fields.  Some may question the approach, but it 
has
it's advantages.  I don't have anything in the program specifically related to
the data in the files, so I don't have to maintain the program when revisions 
are
made to the data.  Also, it allows the users to enter selection criteria based 
on
anything the files have in them and not just the fields I decided to program 
for.

D.BALE@handleman.com wrote:

> Assuming that the user is entering the "rest" on an entry line, how does one
> go about doing that in REXX?  How about a simple shell where a CL program is
> called, prompts the user, the user enters the:
>
>       a = b and (c = d or c = e or c = f)
>
> How do you get that input into "rest"?  And, assuming this is to be used for
> record selection, how do you do that in REXX?  What are the performance
> implications?  Would the "stack machine" discussed previously be faster?
>
> All very interesting stuff.
>
> Dan Bale
> IT - AS/400
> Handleman Company
> 248-362-4400  Ext. 4952
>
> -------------------------- Original Message --------------------------
> Consider using REXX for this.
>
>      Signal on Syntax        /* Catch not valid expressions */
>      Interpret 'I = ' rest   /* Evaluate the expression */
>      Return i
>
> Regards,
>
> Jim Langston
>
> Date: Mon, 23 Oct 2000 09:18:08 -0500
> From: Terry Grider <tgrider@arkansas.net>
> Subject: Evaluate complex conditions
>
> 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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