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From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: Adam Porter <adam@alphapapa.net>
Cc: emacs-devel@gnu.org
Subject: Re: Make peg.el a built-in library?
Date: Thu, 26 Aug 2021 10:25:27 -0700	[thread overview]
Message-ID: <87mtp49kzc.fsf@ericabrahamsen.net> (raw)
In-Reply-To: <87bl5k87hq.fsf@alphapapa.net> (Adam Porter's message of "Thu, 26 Aug 2021 12:02:09 -0500")

Adam Porter <adam@alphapapa.net> writes:

> FWIW, I've been happy using peg.el in org-ql.  I use it to parse strings
> like:
>
>   "todo:WAITING scheduled:from=2021-08-01,to=2021-08-31"
>
> into a sexp like:
>
>   (and (todo "WAITING")
>        (scheduled :from "2021-08-01" :to "2021-08-31"))
>
> You can see the code I use here:
>
> https://github.com/alphapapa/org-ql/blob/master/org-ql.el#L854

This is very helpful, thanks. The peg.el comments are not very helpful
when it comes to actions, so it's great to have more examples. I'll try
to provide a comment patch to the library once I've made more progress.

> I can't speak much to its performance, because it's plenty fast enough for the
> relatively light usage it gets in org-ql.  

In gnus-search.el it would be the same situation: performance wouldn't
matter at all. If I can use it for IMAP server parsing, though, it would
be important not to be too slow.

> My only, minor complaint is that I ended up having to use `eval' on
> its `with-peg-rules' macro at runtime:
>
> https://github.com/alphapapa/org-ql/blob/94f9e6f3031b32cf5e2149beca7074807235dcb0/org-ql.el#L908
>
> I tried many, many things before resorting to that, so I don't think I
> missed any alternatives at the time.  If that aspect of the API could be
> improved, it would be welcomed, but I don't think it's necessary to do
> so before adding it to Emacs.
>
> (The issue is that the tokens that are parsed can be added to at
> runtime, so they are stored in a variable, and the parsing function is
> redefined as necessary at runtime, so it's not possible to define the
> parser fully at expansion time.)

This doesn't mean much to me (yet), but I'll keep an eye out!

> Thanks for suggesting this, Eric.  

Thanks for pointing out that it exists!



  reply	other threads:[~2021-08-26 17:25 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25 18:52 Make peg.el a built-in library? Eric Abrahamsen
2021-08-26  6:17 ` Eli Zaretskii
2021-08-26 15:34   ` Eric Abrahamsen
2021-09-09  4:36     ` Eric Abrahamsen
2021-09-19 15:25       ` Eric Abrahamsen
2021-09-30 19:44       ` Stefan Monnier
2021-09-30 20:34         ` Adam Porter
2021-10-01  8:14           ` Augusto Stoffel
2021-10-01 18:05           ` Stefan Monnier
2021-10-01 18:40             ` Eric Abrahamsen
2021-10-02  3:57               ` Stefan Monnier
2021-10-02  7:32             ` Adam Porter
2021-10-02 14:45               ` Stefan Monnier
2021-10-02 15:13                 ` Adam Porter
2021-08-26 17:02 ` Adam Porter
2021-08-26 17:25   ` Eric Abrahamsen [this message]
2021-08-27  3:17   ` Eric Abrahamsen
2021-08-27  6:41     ` Helmut Eller
2021-08-27 16:57       ` Eric Abrahamsen
2021-09-26 10:59       ` Augusto Stoffel
2021-09-26 15:06         ` Eric Abrahamsen
2021-09-26 18:36           ` Augusto Stoffel
2021-09-27 16:18             ` Eric Abrahamsen
2021-09-27 22:34         ` Richard Stallman
2021-09-28  3:52           ` Eric Abrahamsen
2021-09-28  8:09             ` tomas
2021-09-28  9:32               ` Helmut Eller
2021-09-28 10:45                 ` tomas
2021-09-28 15:24               ` Augusto Stoffel
2021-09-30  6:04             ` Richard Stallman
2021-10-01  3:27               ` Eric Abrahamsen
2021-10-09  1:31 ` Michael Heerdegen
2021-10-09  5:28   ` Michael Heerdegen
2021-10-09  8:12     ` Helmut Eller
2021-10-09 12:52       ` Stefan Monnier
2021-10-10  5:49         ` Helmut Eller
2021-10-14 10:25       ` Michael Heerdegen
2021-10-09 12:54   ` Stefan Monnier
2021-10-09 16:47     ` Eric Abrahamsen
2021-10-10  4:20       ` Michael Heerdegen
2021-10-10 21:40         ` Eric Abrahamsen
2021-10-13  2:58           ` Michael Heerdegen
2021-10-09 16:49   ` Eric Abrahamsen
2021-10-10  3:43     ` Stefan Monnier
2021-10-10  4:46       ` Michael Heerdegen
2021-10-10  5:58         ` Helmut Eller
2021-10-10 13:56           ` Stefan Monnier
2021-10-22 16:33           ` Michael Heerdegen
2021-10-31 23:43           ` Michael Heerdegen
2021-11-15 23:16             ` Michael Heerdegen
2022-11-07  3:33 ` Ihor Radchenko
2022-11-07 19:46   ` Eric Abrahamsen
2022-11-08  6:57     ` Helmut Eller
2022-11-08  8:51       ` Ihor Radchenko
2022-11-10  4:04       ` Richard Stallman
2022-11-10  5:25         ` tomas
2022-11-10  8:15           ` Eli Zaretskii
2022-11-10  8:29             ` tomas
2022-11-11  4:36           ` Richard Stallman
2022-11-08  8:47     ` Ihor Radchenko
2022-11-08 16:18       ` Eric Abrahamsen
2022-11-08 19:08         ` tomas
2022-11-08 19:42           ` Eric Abrahamsen
2022-11-16  4:27             ` [PATCH] " Eric Abrahamsen
2022-11-16  5:07               ` tomas
2022-11-16  5:39                 ` Eric Abrahamsen
2022-11-16 15:53                   ` tomas
2022-11-16  6:24               ` Ihor Radchenko
2022-11-16 18:15                 ` Eric Abrahamsen
2022-11-17 12:21                   ` Ihor Radchenko
2022-11-27  1:46                     ` Eric Abrahamsen
2022-11-27  8:57                       ` Eli Zaretskii
2022-11-28  1:09                         ` Eric Abrahamsen
2022-11-28 12:16                           ` Eli Zaretskii
2023-09-25  1:30                             ` Eric Abrahamsen
2023-09-25  2:27                               ` Adam Porter
2023-09-25 13:00                                 ` Alexander Adolf
2024-03-24 14:19                               ` Ihor Radchenko
2024-03-24 15:32                                 ` Eli Zaretskii
2024-03-25  1:45                                   ` Eric Abrahamsen
2023-01-11  7:39               ` Michael Heerdegen
2023-01-11  8:04                 ` Ihor Radchenko
2023-01-11 11:01                   ` Michael Heerdegen
2023-01-11 11:32                     ` tomas
2023-02-05 12:10                     ` Ihor Radchenko
2023-02-05 15:41                       ` Eduardo Ochs
2023-02-05 15:45                         ` Ihor Radchenko
2023-02-05 16:19                           ` Eduardo Ochs
2023-02-05 16:50                             ` Ihor Radchenko
2023-02-09  5:44                         ` Jean Louis
2023-02-06  0:33                       ` Michael Heerdegen
2022-11-08 14:01     ` Stefan Monnier
2022-11-08 14:42       ` tomas
2022-11-08 15:08       ` Visuwesh
2022-11-08 16:29         ` Juanma Barranquero
2022-12-02 20:20           ` Augusto Stoffel
2022-11-08 16:10       ` Eric Abrahamsen
2022-11-08 18:59         ` tomas
2022-11-08 19:42           ` Eric Abrahamsen
2022-11-08 22:03             ` Tim Cross

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