unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
From: phillip.lord@russet.org.uk (Phillip Lord)
To: Nicolas Petton <nicolas@petton.fr>
Cc: Damien Cassou <damien@cassou.me>, emacs-devel <emacs-devel@gnu.org>
Subject: Re: streams are cool, you could stream virtually anything!
Date: Wed, 04 Nov 2015 17:00:03 +0000	[thread overview]
Message-ID: <87wptxog30.fsf@russet.org.uk> (raw)
In-Reply-To: <87ziyuaqhl.fsf@petton.fr> (Nicolas Petton's message of "Wed, 4 Nov 2015 13:39:02 +0100")


At the risk of this sounding like a plug, it was my desire to get away
from looping that motivated my own library m-buffer
(https://github.com/phillord/m-buffer-el). This is not lazy, but is list
based.

I'd have a couple of questions with this approach. First, what happens
if the lambda *changes* the buffer? Mixing this form of mutability with
laziness is, I think, going to be unpredictable.

Second question, what happens to the match data? How would you deal with
nil'ing markers after use? Otherwise, you're going to fill the buffer up
with markers (they do GC, but slowly).

Phil

Nicolas Petton <nicolas@petton.fr> writes:

> Hi guys,
>
> Aren't you tired of writing the same for loops in various contexts?
> I know I was, and there's a better way!
>
> I just added a function `stream-regexp' to stream.el to stream the
> search of a regexp in a buffer:
>
>
>     (let ((str (stream-regexp buf ".*foo\\(.*\\)$")))
>       (seq-map (lambda (match-data)
>                  ...)
>                str))
>
> (I still have to document it and test it properly)
>
> Because streams are lazy and immutable, you can reuse such a stream
> forever or keep it for later, move around in a buffer or modify the
> buffer and re-evaluate the stream (you'll get new match data), or map
> the result, etc.
>
> All the credit goes to Damien Cassou for giving me the idea :-)
>
> Cheers,
> Nico



  parent reply	other threads:[~2015-11-04 17:00 UTC|newest]

Thread overview: 209+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-04 12:39 streams are cool, you could stream virtually anything! Nicolas Petton
2015-11-04 15:50 ` John Wiegley
2015-11-04 16:59   ` Damien Cassou
2015-11-04 18:06   ` Michael Heerdegen
2015-11-04 19:17     ` Michael Heerdegen
2015-11-04 21:58     ` Nicolas Petton
2015-11-04 23:20       ` T.V Raman
2015-11-04 23:31         ` Nicolas Petton
2015-11-05  0:27         ` John Wiegley
2015-11-05  0:38           ` T.V Raman
2015-11-05  0:48             ` ELPA policy (Was: streams are cool, you could stream virtually anything!) John Wiegley
2015-11-05  0:52               ` T.V Raman
2015-11-08 17:18               ` ELPA policy Achim Gratz
2015-11-08 17:49                 ` Eli Zaretskii
2015-11-08 20:52                   ` Aaron Ecay
2015-11-09  3:42                     ` Eli Zaretskii
2015-11-09  3:51                       ` Dmitry Gutov
2015-11-09 11:15                         ` New ELPA policy proposal (was: ELPA policy) Oleh Krehel
2015-11-09 13:51                           ` Artur Malabarba
2015-11-09 15:02                             ` New ELPA policy proposal Oleh Krehel
2015-11-09 16:22                               ` Artur Malabarba
2015-11-09 15:41                             ` Wolfgang Jenkner
2015-11-09 15:50                               ` Dmitry Gutov
2015-11-09 16:13                                 ` Wolfgang Jenkner
2015-11-09 21:50                                   ` Richard Stallman
2015-11-09 16:25                               ` Artur Malabarba
2015-11-09 16:11                           ` New ELPA policy proposal (was: ELPA policy) Eli Zaretskii
2015-11-10  7:26                             ` New ELPA policy proposal Oleh Krehel
2015-11-10 14:24                               ` John Wiegley
2015-11-10 16:36                                 ` Eli Zaretskii
2015-11-09 16:05                         ` ELPA policy Eli Zaretskii
2015-11-09 16:15                           ` Dmitry Gutov
2015-11-09 16:20                             ` Eli Zaretskii
2015-11-09 16:26                               ` Dmitry Gutov
2015-11-09 16:44                                 ` Eli Zaretskii
2015-11-09 17:46                                   ` Dmitry Gutov
2015-11-09 16:35                               ` Artur Malabarba
2015-11-09 19:52                               ` John Wiegley
2015-11-09 20:17                                 ` Achim Gratz
2015-11-09 21:38                                   ` John Wiegley
2015-11-10 20:07                                     ` Achim Gratz
2015-11-09 21:51                                 ` Richard Stallman
2015-11-09 22:06                                   ` John Wiegley
2015-11-09 23:05                                     ` Artur Malabarba
2015-11-10 18:18                                       ` Richard Stallman
2015-11-11 15:11                                         ` Nicolas Petton
2015-11-11 17:03                                           ` Richard Stallman
2015-11-09 23:47                                     ` Nicolas Petton
2015-11-09 23:44                                   ` Nicolas Petton
2015-11-09 23:42                                 ` Nicolas Petton
2015-11-09 23:52                                 ` Aaron Ecay
2015-11-10  0:04                                   ` John Wiegley
2015-11-10 18:06                                 ` Stephen Leake
     [not found]                                   ` <"<87lha5snji.fsf"@isaac.fritz.box>
     [not found]                                     ` <"<87d1vhsmuj.fsf"@isaac.fritz.box>
     [not found]                                       ` <"<878u65slue.fsf"@isaac.fritz.box>
     [not found]                                         ` <"<874mgtsjwn.fsf"@isaac.fritz.box>
2015-11-10 18:28                                   ` John Wiegley
2015-11-10 18:32                                     ` Dmitry Gutov
2015-11-10 18:35                                       ` John Wiegley
2015-11-10 18:44                                         ` David Engster
2015-11-10 18:49                                           ` John Wiegley
2015-11-10 20:00                                           ` Dmitry Gutov
2015-11-11 15:15                                             ` xref and GNU Global (Re: ELPA policy) Nicolas Petton
2015-11-11 15:22                                               ` Dmitry Gutov
2015-11-11 23:19                                                 ` Stephen Leake
2015-11-11 23:32                                                   ` Dmitry Gutov
2015-11-12  7:07                                                     ` Stephen Leake
2015-11-11 23:12                                               ` Stephen Leake
2015-11-11 23:52                                                 ` Nicolas Petton
2015-11-12  7:05                                                   ` Stephen Leake
2015-11-10 19:15                                         ` ELPA policy Eli Zaretskii
2015-11-10 22:44                                           ` xref CEDET (was ELPA policy) Stephen Leake
2015-11-10 21:52                                         ` ELPA policy Dmitry Gutov
2015-11-10 18:37                                       ` David Engster
2015-11-10 19:57                                         ` Dmitry Gutov
2015-11-10 20:01                                           ` Eli Zaretskii
2015-11-10 20:19                                             ` Dmitry Gutov
2015-11-10 20:34                                               ` Eli Zaretskii
2015-11-10 21:16                                                 ` Dmitry Gutov
2015-11-10 21:27                                                   ` Dmitry Gutov
2015-11-10 22:40                                               ` Stephen Leake
2015-11-10 20:45                                           ` David Engster
2015-11-10 21:07                                             ` Dmitry Gutov
2015-11-10 18:43                                     ` David Engster
2015-11-10 18:52                                       ` John Wiegley
2015-11-10 18:58                                         ` David Engster
2015-11-10 19:03                                           ` John Wiegley
2015-11-10 19:20                                             ` David Engster
2015-11-10 19:43                                               ` John Wiegley
2015-11-10 20:02                                                 ` David Engster
2015-11-10 20:24                                                   ` John Wiegley
2015-11-10 23:08                                                     ` Stephen Leake
2015-11-10 23:31                                                       ` John Wiegley
2015-11-11  0:32                                                         ` Drew Adams
2015-11-11  0:36                                                           ` John Wiegley
2015-11-11  9:25                                                             ` Stephen Leake
2015-11-11 13:52                                                               ` Filipp Gunbin
2015-11-11 21:22                                                                 ` Stephen Leake
2015-11-12 13:24                                                                   ` Filipp Gunbin
2015-11-12 17:11                                                                     ` John Wiegley
2015-11-12 19:17                                                                       ` Filipp Gunbin
2015-11-12 19:31                                                                         ` John Wiegley
2015-11-14 10:16                                                                         ` Stephen Leake
2015-11-12 19:52                                                                     ` Stephen Leake
2015-11-13 13:06                                                                       ` Filipp Gunbin
2015-11-14 10:30                                                                         ` Stephen Leake
2015-11-17 13:01                                                                           ` Filipp Gunbin
2015-11-17 16:18                                                                             ` Stephen Leake
2015-11-17 15:51                                                                           ` Tom Tromey
2015-11-11 17:02                                                               ` Richard Stallman
2015-11-11 17:24                                                                 ` John Wiegley
2015-11-12 14:02                                                                   ` Phillip Lord
2015-11-12 17:11                                                                     ` John Wiegley
2015-11-12 19:59                                                                     ` Stephen Leake
2015-11-13 21:58                                                                     ` Richard Stallman
2015-11-14  1:15                                                                       ` JJ Asghar
2015-11-14 17:23                                                               ` Jorge A. Alfaro-Murillo
2015-11-15 16:37                                                                 ` John Wiegley
     [not found]                                                             ` <<86bnb06g7g.fsf@stephe-leake.org>
     [not found]                                                               ` <<E1ZwYnH-0004b0-Gu@fencepost.gnu.org>
2015-11-11 17:47                                                                 ` Drew Adams
2015-11-11 19:23                                                                   ` John Wiegley
2015-11-11 19:58                                                                     ` Drew Adams
2015-11-11 23:27                                                                     ` Richard Stallman
2015-11-12  0:35                                                                       ` Artur Malabarba
2015-11-12  0:42                                                                         ` Dmitry Gutov
2015-11-12 22:34                                                                         ` Richard Stallman
2015-11-13  0:49                                                                           ` Artur Malabarba
2015-11-12  6:49                                                                       ` Stephen Leake
2015-11-12 15:09                                                                         ` Drew Adams
2015-11-12 17:29                                                                           ` Alex Schröder
2015-11-12 22:33                                                                         ` Richard Stallman
2015-11-14 10:33                                                                           ` Stephen Leake
2015-11-14 21:05                                                                             ` Richard Stallman
     [not found]                                                                       ` <<86oaezemp9.fsf@stephe-leake.org>
     [not found]                                                                         ` <<E1Zx0QR-0004QE-Ga@fencepost.gnu.org>
2015-11-12 23:05                                                                           ` Drew Adams
2015-11-13  7:51                                                                             ` Eli Zaretskii
2015-11-13 22:00                                                                             ` Richard Stallman
     [not found]                                                                             ` <<E1ZxMOr-0004hb-VH@fencepost.gnu.org>
2015-11-13 23:03                                                                               ` Drew Adams
2015-11-14  1:44                                                                                 ` Richard Stallman
2015-11-15  9:28                                                                                   ` Michael Heerdegen
2015-11-15 15:44                                                                                     ` Drew Adams
2015-11-17 22:55                                                                                       ` Richard Stallman
2015-11-17 23:17                                                                                         ` John Wiegley
2015-11-18  9:53                                                                                           ` Artur Malabarba
2015-11-18 10:12                                                                                             ` David Kastrup
2015-11-14  9:57                                                                                 ` Achim Gratz
     [not found]                                                                   ` <<m2twosgx1m.fsf@Vulcan.attlocal.net>
     [not found]                                                                     ` <<E1Zwent-0000bG-9i@fencepost.gnu.org>
2015-11-12  0:22                                                                       ` Drew Adams
2015-11-10 23:01                                                   ` Stephen Leake
2015-11-10 22:53                                                 ` Stephen Leake
2015-11-10 19:17                                         ` Eli Zaretskii
2015-11-10 23:10                                           ` Stephen Leake
2015-11-10 22:52                                         ` Stephen Leake
2015-11-10 18:49                                     ` Eli Zaretskii
2015-11-10 18:54                                       ` John Wiegley
2015-11-10 19:21                                         ` Eli Zaretskii
2015-11-10 19:26                                           ` Eli Zaretskii
2015-11-10 19:29                                             ` John Wiegley
2015-11-10 20:06                                           ` Dmitry Gutov
2015-11-10 23:25                                           ` Stephen Leake
2015-11-10 23:23                                         ` Stephen Leake
2015-11-10 20:03                                       ` Dmitry Gutov
2015-11-10 23:16                                       ` Stephen Leake
2015-11-10 22:36                                     ` Stephen Leake
2015-11-10 22:54                                       ` John Wiegley
2015-11-10 23:01                                         ` Drew Adams
2015-11-11  9:13                                           ` Stephen Leake
2015-11-11 14:58                                             ` Drew Adams
2015-11-09 18:22                       ` Achim Gratz
2015-11-09 18:45                         ` Eli Zaretskii
2015-11-09 18:58                           ` David Engster
2015-11-09 19:08                             ` Eli Zaretskii
2015-11-09 19:35                               ` David Engster
2015-11-09 20:12                                 ` Eli Zaretskii
2015-11-09 19:53                           ` Rasmus
2015-11-09 19:58                           ` Achim Gratz
2015-11-05 17:06           ` streams and generators (was: streams are cool, you could stream virtually anything!) Michael Heerdegen
2015-11-05 22:36             ` streams and generators Dmitry Gutov
2015-11-04 23:34       ` streams are cool, you could stream virtually anything! Michael Heerdegen
2015-11-05  9:27         ` Nicolas Petton
2015-11-05 11:26           ` Artur Malabarba
2015-11-05 11:52             ` Nicolas Petton
2015-11-05 16:31               ` raman
2015-11-05 16:48                 ` Michael Heerdegen
2015-11-05 21:58                   ` Nicolas Petton
2015-11-05 23:05                     ` Artur Malabarba
2015-11-05 23:34                       ` T.V Raman
2015-11-06  0:02                         ` Artur Malabarba
2015-11-06  0:39                           ` T.V Raman
2015-11-05 23:52                       ` Michael Heerdegen
2015-11-06  2:19                         ` John Wiegley
2015-11-06  2:47                           ` Michael Heerdegen
2015-11-06 15:09                             ` Filipp Gunbin
2015-11-06 10:49                           ` Nicolas Petton
2015-11-06 13:09                             ` Artur Malabarba
2015-11-06 13:43                               ` Nicolas Petton
2015-11-06 15:41                                 ` John Wiegley
2015-11-06 16:13                                   ` John Wiegley
2015-11-06 17:36                                   ` Nicolas Petton
2015-11-06 10:47                         ` Nicolas Petton
2015-11-06  2:08                   ` John Wiegley
2015-11-06 15:33                     ` Nicolas Petton
2015-11-06 16:08                       ` John Wiegley
2015-11-06 17:12                         ` Nicolas Petton
2015-11-05 23:06               ` Artur Malabarba
2015-11-05 14:12             ` Michael Heerdegen
2015-11-04 17:00 ` Phillip Lord [this message]
2015-11-04 22:00   ` Nicolas Petton
2015-11-05 12:28     ` Phillip Lord
2015-11-05 13:45       ` Nicolas Petton
2015-11-05 15:15         ` Michael Heerdegen
2015-11-05 16:35       ` Eli Zaretskii
2015-11-06  9:54         ` Phillip Lord
2015-11-04 17:57 ` Michael Heerdegen
2015-11-04 22:00   ` Nicolas Petton
     [not found] <<87ziyuaqhl.fsf@petton.fr>

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87wptxog30.fsf@russet.org.uk \
    --to=phillip.lord@russet.org.uk \
    --cc=damien@cassou.me \
    --cc=emacs-devel@gnu.org \
    --cc=nicolas@petton.fr \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).