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Re: using re 'eval' for varibable math

by tall_man (Parson)
on Apr 19, 2005 at 20:53 UTC ( #449426=note: print w/replies, xml ) Need Help??

in reply to using re 'eval' for varibable math

The Math::Pari module can evaluate mathematical expressions with a more restricted syntax than perl's -- but watch out for "system()". Here's an example.
use strict; use Math::Pari qw(PARI); my $question="67.35 >= 50 && 67.35 < 80"; # Pari doesn't like white space in expressions. $question =~ s/\s+//g; my $out = PARI $question; print $out,"\n";

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[haukex]: But I was just using it as an author test anyway
[Corion]: haukex: Aaah - I thought you were still running these tests on every machine, but you only run these as author or Devel::Cover tests
[Corion]: haukex: Yeah, I think back then I used Test::Inline, which used a pod parser that was going through some changes and I didn't want to cater for all the various versions and thus stopped testing the Pod completely
[choroba]: I usually do this with presentations
[Corion]: But now I think statically (re)generating the Pod tests is a saner approach, and likely I'll regenerate the tests either in Makefile.PL or from xt/ but have them live below t/
[choroba]: I keep the snippets in files of their own, and use a Makefile to syntax highlight them and insert them into slides, while also running them and inserting the output if required
[Corion]: choroba: Ooooh - I didn't think of that! I write my presentations as POD and if it "roughly" looks like Perl code, I should also syntax-check that...
[haukex]: Yes sorry I don't run them all the time, my POD tests are only run as author tests (and are excluded when I'm using Devel::Cover)
[Corion]: choroba: Hmm - no, I keep the snippets inline, but as my framework also has support for capturing output etc., maybe I should do the same...
[Corion]: haukex: Yes, that approach is sane, and it heals the fragility of Pod parsers in a nice way while still syntax-checking stuff

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