Help improve program for parsing simple rules

[John Machin]

On Apr 18, 1:26 am, Paul McGuire <pt... at austin.rr.com> wrote:
> On Apr 16, 10:57 am, prueba... at latinmail.com wrote:
>
> > Another interesting task for those that are looking for some
> > interesting problem:
> > I inherited some rule system that checks for programmers program
> > outputs that to be ported: given some simple rules and the values it
> > has to determine if the program is still working correctly and give
> > the details of what the values are. If you have a better idea of how
> > to do this kind of parsing please chime in. I am using tokenize but
> > that might be more complex than it needs to be. This is what I have
> > come up so far:
>
> I've been meaning to expand on pyparsing's simpleArith.py example for
> a while, to include the evaluation of the parsed tokens.  Here is the
> online version,http://pyparsing.wikispaces.com/file/view/eval_arith.py,
> it will be included in version 1.5.2 (coming shortly).  I took the
> liberty of including your rule set as a list of embedded test cases.

Hi Paul,

I don't see how it can handle the chained relop in the last two
testcases e. g. '0.00 LE A LE 4.00' -- unless relops are chained by
default in your parser.

Cheers,
John