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| Can vi emulate the power of yacc? rockbrentwood@gmail.com (2020-03-13) |
| From: | rockbrentwood@gmail.com |
| Newsgroups: | comp.compilers |
| Date: | Fri, 13 Mar 2020 00:56:01 -0700 (PDT) |
| Organization: | Compilers Central |
| Injection-Info: | gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="55127"; mail-complaints-to="abuse@iecc.com" |
| Keywords: | syntax, question |
| Posted-Date: | 13 Mar 2020 08:26:35 EDT |
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.
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