Is the group active?

[clueless newbie]

Is this group active? or is there someplace else?

[Jeffrey Kegler]

It is active, although obviously it does not get much traffic.  Currently our IRC channel, #marpa at irc.libera.chat is getting much more use.

[clueless newbie]

Recently my wife gave me a gift by becoming your patreon. 

Unfortunately everything was set up on her account. LOL!

[Jeffrey Kegler]

Again, many thanks for thinking of me for the donation.

I think my donors are special people because, while there are many worthwhile causes and generous donors out there, my donors have to do some research in order to understand the reason for their donation.  This extra effort makes them stand out.

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[Jeffrey Kegler]

I wondered who that was.  Thank you very much!

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------- Original Message -------
On Saturday, February 5th, 2022 at 5:35 PM, clueless newbie <li.han...@gmail.com> wrote:

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[clueless newbie]

It is my wife to whom the thanks are owed - recognizing that I'm struggling with Marpa -- she searched the "social" pages and found your patreon page.

I've been playing with  Lukas Atkinson's https://lukasatkinson.de/2013/transforming-syntax/ along with a stackoverflow post https://stackoverflow.com/questions/25698167/does-the-marpa-parser-library-support-error-recovery and ended up with the following pieces of code. I would appreciate knowing if the approach to dealing with errors in PPAst_02.t (the for loop) and in AST.pm (the AUTOLOAD sub) is reasonable. (As you can see I'm trying to cobble together something that will let me focus on the grammar and how to deal with what Marpa returns!)

[Jeffrey Kegler]

I looked the code over.  The error apparatus is on the heavy-weight side, but depending on the application and your preferences (start-minimal-and-add versus start-heavyweight-and-cut) that may be the right thing.

My most recent effort at a read loop with error (and exception) is a linter for a language called Hoon.  The main read loop is here.  hoonlint is on production scale (not a toy example).  From it you can see the kind of approach I was favoring at that time.

I let the folks at the IRC channel know about this exchange, so perhaps we'll see some input from them.

jeffrey

[F. Li]

Many thanks for looking at crude efforts.

Yours,

clueless newbie

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[Ron Savage]

Hi Clueless

I second Jeffrey's suggestion that you switch to IRC.

As for comments re error handling, I'll repeat here what I've just posted on the IRC channel #marpa:

Re: https://colabti.org/irclogger/irclogger_log/marpa?date=2022-02-09#l14. For a different way of handling errors, have a look at the source code for Text::Delimited::Marpa, and in particular its usage of Const::Exporter.

The source is on-line at https://metacpan.org/release/RSAVAGE/Text-Delimited-Marpa-1.01/source/lib/Text/Delimited/Marpa.pm.

Also, some examples of using Marpa::R2 are at http://savage.net.au/Module-reviews.html#Output_from_my_Marpa_oriented_modules.

Likewise, lots of Marpa stuff is at http://savage.net.au/Marpa.html.

PS

You do realize, I hope, that 'clueless newbie' is a tautology, right? Hahaha.

Cheers

Ron

[Jeffrey Kegler]

Actually, re the term "newbie", anyone who can formulate a Marpa question is an expert IMHO.   Parsing has fallen into such a decline that you can get a PhD from a good school and not have had a course in parsing or compiler writing.  That means that if you ask a Marpa question you are using concepts and terms unfamiliar even to many experts.

And, while yes, more people will see questions on IRC, having questions here does make the mailing list more inviting.  As the subject line suggests we were getting to the point where people will look at the group and think it is inactive.  And some folks are reluctant about IRC.  So my thought is that we should not have an official preference, and that it's really up to F. Li.

To view this discussion on the web visit https://groups.google.com/d/msgid/marpa-parser/b0d39b0d-faae-4141-99c2-be785e50bf4bn%40googlegroups.com.

[Ron Savage]

Hi Jeffrey

OK!

[F. Li]

Hi, Jeffrey,

I made the "main" rather heavy on the error recovery side in the hopes that I might be able to focus on the grammar and the  resulting AST in isolation. (I wanted to be able to do "perl -M<grammar etc>  main.pl" without having to change main.pl.) Whether or not I was/am successful at that remains to be seen! 

Hi, Ron,

Thanks for the link to Text::Delimited::Marpa - at the moment use of events is well over my head! I will however study it carefully in hopes of becoming less clueless.

F

PS:I think my father would have suggested that Srinivasa Ramanujan proves that not all newbies are clueless.

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[Ron Savage]

Hmmm, yes. Srinivasa Ramanujan is certainly an extraordinary case to consider.