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From: Philip Kaludercic <philipk@posteo.net>
To: Okamsn <okamsn@protonmail.com>
Cc: nicolas@petton.fr, 67456@debbugs.gnu.org
Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
Date: Mon, 25 Dec 2023 20:26:18 +0000	[thread overview]
Message-ID: <87tto6rpud.fsf@posteo.net> (raw)
In-Reply-To: <6f6d9f2d-fee9-4d1d-a1e4-8c6ce57a0627@protonmail.com> (okamsn@protonmail.com's message of "Sun, 26 Nov 2023 17:17:35 +0000")

Okamsn <okamsn@protonmail.com> writes:

> Hello,
>
> The attached features work like `cl-maplist` and `cl-mapl`, applying 
> functions to a sequence and to the remaining parts of a sequence.  For 
> example, `(seq-mapsub #'identity [1 2 3])` returns `([1 2 3] [2 3] [3])`.
>
> The patch adds a `seq-mapsub`, `seq-dosub`, and a `seq-doseqsub`, 
> similar to `seq-map`, `seq-do`, and `seq-doseq`, respectively.

How about adding a custom sequence type, that operates on sub-sequences
as elements?

--8<---------------cut here---------------start------------->8---
(cl-defstruct (subseq (:constructor seq-make-subseq (seq))) seq)

(cl-defmethod seq-elt ((seq subseq) n)
  (seq-subseq (subseq-seq seq) n (seq-length seq)))

(cl-defmethod seq-length ((seq subseq))
  (seq-length (subseq-seq seq)))

(cl-defmethod seq-do (fn (seq subseq))
  (seq-do fn (subseq-seq seq)))

;; etc.
--8<---------------cut here---------------end--------------->8---

It might not be that efficient either, but at least it doesn't require
more functions.





      parent reply	other threads:[~2023-12-25 20:26 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-26 17:17 bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences Okamsn via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-11-28  1:29 ` Okamsn via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-12-01 20:14   ` Augusto Stoffel
2023-12-03  1:25     ` Okamsn via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-12-25 20:26 ` Philip Kaludercic [this message]

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