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Re: use Elisp to improve your Elisp - some code issues


From: Pascal J. Bourguignon
Subject: Re: use Elisp to improve your Elisp - some code issues
Date: Sat, 01 Aug 2015 17:59:37 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Emanuel Berg <address@hidden> writes:

> "Pascal J. Bourguignon" <address@hidden>
> writes:
>
>> Perhaps you have notied some discrepancy here.
>> Check:
>> https://en.wikipedia.org/wiki/Chomsky_hierarchy
>
> It would be more illustrative if you provide
> a counterexample of the same construct which cannot be
> caught by that or another regexp. It will be
> interesting to see if that example is anything I would
> put in my code, ever.

It's easy.  Try to simplify (- x x) for any sexp x, (assuming x doesn't
side effect.  Just something like (+ 2 y) or (+ (* a x x) (* b x) c).



-- 
__Pascal Bourguignon__                 http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
dog. The man will be there to feed the dog. The dog will be there to
keep the man from touching the equipment.” -- Carl Bass CEO Autodesk


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