The Awk State Machine Parser Pattern (2018)

• awk-libs

  1 241 10.0 Awk

  GNU awk libraries

• md2html.awk

  1 8 0.0 Awk

I used a similar technique for my awk markdown parser: https://github.com/yiyus/md2html.awk

An awk state machine is a quite straightforward way to deal with data like this log file. It is not so clear that this is the best way to write a relatively large piece of software, like a markdown parser (when I wrote md2html.awk in 2009, the standard md parser was the original one by John Gruber, written in Perl, so it actually was an improvement in code clarity, performance, and portability (we had no perl in Plan 9!), but nowadays it is easy to find much better solutions).

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• tbl2bed

  1 1 0.0 Perl

  Convert a feature table into a bed file

Glad I’m not the only one crazy enough to write long AWK parsers. Here’s my tool to convert “feature tables” into “bed” files, both files that describe genomes, but for some reason, NCBI uses the former, even though it’s totally useless. https://github.com/ryandward/tbl2bed/blob/main/tbl2bed.awk

• diff2html

  3 2 0.0 Shell

  A script that employs awk and bash to html output of diff between 2 files quickly* (by berry-thawson)

https://github.com/berry-thawson/diff2html

This is first attempt in writing awk script. Would like to know how readable it is.

• Onigmo

  3 611 0.0 C

  Onigmo is a regular expressions library forked from Oniguruma.

>Ruby even supports Perl regular expressions

No, Ruby Regexp is based on the https://github.com/k-takata/Onigmo library. There are plenty of differences compared to Perl, for example `^` and `$` anchors always match start/end of lines without needing a flag, subexpression syntax uses `\g` instead of `(?N)` and so on.

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