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From: rockbrentwood@gmail.com
Newsgroups: comp.compilers
Subject: Can vi emulate the power of yacc?
Date: Fri, 13 Mar 2020 00:56:01 -0700 (PDT)
Organization: Compilers Central
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There are 3 ingredients in vi which, when combined, via the Chomsky-Schuetzenberger Theorem, may give it the power to fully emulate simple syntax direct translations and push down transducers ... and possibly even syntax directed translations.

(1) "%" to match brackets; with the important condition that this works on at least 2 different kinds of brackets
(2) the regular expression facility; particularly its ability to name and use parameters
(3) the search & replace function.

So, here's a simple challenge of sorts to test the idea: write a vi script that converts between infix and postfix order with at least two levels of operator precedence. I don't know if it can actually be done.