[Oisf-wg-configuration_language] YAML issues. (Jason Ish)

[Matt C]

Hi.  Using YAML for variable expansion you could do:

&HOME_NET 172.16.1.0/24

And then *HOME_NET to reference it.

Of course, YAML itself has no understanding of "!$HOME_NET" as that is not a
simple expansion.

Even though I have been the one advocating YAML from the start, I think that
if you want to maintain strict compatibility with Snort you are better off
just just building a custom parser.

I would still advocate building a parser in a language like perl or python,
as string handling is far easier and less prone to errors.  If you didn't
want to figure out a way to embed an interperter though, you could use
something like BISON to build a parser for a custom grammar.

Matt C.
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