X-Loop: help-debbugs@HIDDEN
Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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From: Okamsn <okamsn@HIDDEN>
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Hello,
The attached features work like `cl-maplist` and `cl-mapl`, applying=20
functions to a sequence and to the remaining parts of a sequence. For=20
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`,=20
similar to `seq-map`, `seq-do`, and `seq-doseq`, respectively.
I was looking for an equivalent for vectors of `cl-maplist`, `cl-mapl`,=20
and `cl-loop`'s `for VAR on LIST`, and think that these would be useful=20
additions.
To get the sub-sequences, the code uses `seq-rest` and stops when the=20
returned sub-sequence is empty according to `seq-empty-p`. This is=20
similar to how I would do it for a list, using `cdr` and `null`, but is=20
that a good way to do it for arrays and other sequences?
Thank you.
--b1_0UHc1bd4Q0BgDpqpjszXE04CheHhJcGSYrxJNXBMFw4
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Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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Okamsn wrote:
> Hello,
>=20
> 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])`.
>=20
> The patch adds a `seq-mapsub`, `seq-dosub`, and a `seq-doseqsub`,
> similar to `seq-map`, `seq-do`, and `seq-doseq`, respectively.
>=20
> I was looking for an equivalent for vectors of `cl-maplist`, `cl-mapl`,
> and `cl-loop`'s `for VAR on LIST`, and think that these would be useful
> additions.
>=20
> To get the sub-sequences, the code uses `seq-rest` and stops when the
> returned sub-sequence is empty according to `seq-empty-p`. This is
> similar to how I would do it for a list, using `cdr` and `null`, but is
> that a good way to do it for arrays and other sequences?
>=20
> Thank you.
I've updated the patch to only add the one `seq-mapsub` function, to be=20
more like `seq-mapn` and `seq-mapcat`, and to add an optimized version=20
for lists.
Would you like anything changed?
Thank you.
--b1_x5XJONrxbozzHL5DRQPmyW32AcFP2YgDqVVmGSbqHZM
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Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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From: Augusto Stoffel <arstoffel@HIDDEN>
In-Reply-To: <3f57efba-4258-4c81-8c57-e6bedd19888f@HIDDEN> (Okamsn
via's message of "Tue, 28 Nov 2023 01:29:14 +0000")
References: <6f6d9f2d-fee9-4d1d-a1e4-8c6ce57a0627@HIDDEN>
<3f57efba-4258-4c81-8c57-e6bedd19888f@HIDDEN>
Date: Fri, 01 Dec 2023 21:14:13 +0100
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On Tue, 28 Nov 2023 at 01:29, Okamsn via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:
> Okamsn wrote:
>> 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.
>>
>> I was looking for an equivalent for vectors of `cl-maplist`, `cl-mapl`,
>> and `cl-loop`'s `for VAR on LIST`, and think that these would be useful
>> additions.
>>
>> To get the sub-sequences, the code uses `seq-rest` and stops when the
>> returned sub-sequence is empty according to `seq-empty-p`. This is
>> similar to how I would do it for a list, using `cdr` and `null`, but is
>> that a good way to do it for arrays and other sequences?
>>
>> Thank you.
>
> I've updated the patch to only add the one `seq-mapsub` function, to be
> more like `seq-mapn` and `seq-mapcat`, and to add an optimized version
> for lists.
>
> Would you like anything changed?
>
> Thank you.
This operation has quadratic complexity for anything other than regular
linked lists. I'm not sure it's a good idea to add it to a generic
sequence library...
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Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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From: Augusto Stoffel <arstoffel@HIDDEN>
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via's message of "Tue, 28 Nov 2023 01:29:14 +0000")
References: <6f6d9f2d-fee9-4d1d-a1e4-8c6ce57a0627@HIDDEN>
<3f57efba-4258-4c81-8c57-e6bedd19888f@HIDDEN>
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On Tue, 28 Nov 2023 at 01:29, Okamsn via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:
> Okamsn wrote:
>> 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.
>>
>> I was looking for an equivalent for vectors of `cl-maplist`, `cl-mapl`,
>> and `cl-loop`'s `for VAR on LIST`, and think that these would be useful
>> additions.
>>
>> To get the sub-sequences, the code uses `seq-rest` and stops when the
>> returned sub-sequence is empty according to `seq-empty-p`. This is
>> similar to how I would do it for a list, using `cdr` and `null`, but is
>> that a good way to do it for arrays and other sequences?
>>
>> Thank you.
>
> I've updated the patch to only add the one `seq-mapsub` function, to be
> more like `seq-mapn` and `seq-mapcat`, and to add an optimized version
> for lists.
>
> Would you like anything changed?
>
> Thank you.
This operation has quadratic complexity for anything other than regular
linked lists. I'm not sure it's a good idea to add it to a generic
sequence library...
X-Loop: help-debbugs@HIDDEN
Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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Augusto Stoffel wrote:
> This operation has quadratic complexity for anything other than regular
> linked lists. I'm not sure it's a good idea to add it to a generic
> sequence library...
Thank you for the feedback.
Do you know whether there is a better way to implement the idea for=20
arrays? Is there a way to apply a function to a portion of the array=20
without copying the sub-sequences, if that is what you mean?
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Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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Augusto Stoffel wrote:
> This operation has quadratic complexity for anything other than regular
> linked lists. I'm not sure it's a good idea to add it to a generic
> sequence library...
Thank you for the feedback.
Do you know whether there is a better way to implement the idea for=20
arrays? Is there a way to apply a function to a portion of the array=20
without copying the sub-sequences, if that is what you mean?
X-Loop: help-debbugs@HIDDEN
Subject: bug#67456: [PATCH] seq.el: Add functions for mapping over subsequences
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Okamsn <okamsn@HIDDEN> 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.
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