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Re^3: Perl Cannot Be Parsed: A Formal Proof (meh)by adamk (Chaplain) |
on Jan 22, 2008 at 00:14 UTC ( [id://663485]=note: print w/replies, xml ) | Need Help?? |
I suspect he also knew the business about rand(). But with his many hours of real life experience trying to statically parse Perl, he focused on the stronger proof -- the one that would give him the most information about what he was up against in creating PPI. You pretty much nailed it exactly. From a practical perspective there's about 5-10 things that, in various combinations, make Perl impossible to parse. However, there's a big difference between what we believe and what we can prove. And so from the perspective of knowing absolutely that Perl 5 can't be parsed, the Halting Problem approach was by far the most straight forward way to do it (at least to a layman like me). This realization let me finally put the possibility of a complete parser out of my mind, and once I wasn't distracted by completeness any more, I had the chance to evaluate and actually define what "good enough" would mean for a "Perl 5 parser". And that perspective on the problem was the one that took the code in the direction of the working solution.
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