From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Andrea Corallo <akrl@sdf.org>
Cc: emacs-devel@gnu.org, Nicolas Petton <nico@petton.fr>
Subject: Re: [PATCH] extend map-into
Date: Fri, 11 Oct 2019 12:19:47 -0400 [thread overview]
Message-ID: <jwvr23jw9dv.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <xjfpnj4x6bl.fsf@sdf.org> (Andrea Corallo's message of "Thu, 10 Oct 2019 10:06:54 +0000")
> attached.
Thanks, installed into `master` with minor tweaks (e.g. the NEWS entry
was misplaced, and I changed the defsubst into a defun because the
function itself contains a loop so the overhead of the function call is
unlikely to be significant in proportion).
Stefan
> From 7a1b42b1b58f7b0ee20ef24e9e73bce045a1987b Mon Sep 17 00:00:00 2001
> From: Andrea Corallo <akrl@sdf.org>
> Date: Sun, 6 Oct 2019 22:43:11 +0200
> Subject: [PATCH] Extend 'map-into' for better control on hash table creation.
>
> ---
> etc/NEWS | 4 ++++
> lisp/emacs-lisp/map.el | 29 +++++++++++++++++++++--------
> test/lisp/emacs-lisp/map-tests.el | 5 ++++-
> 3 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/etc/NEWS b/etc/NEWS
> index c8cc753..5942a32 100644
> --- a/etc/NEWS
> +++ b/etc/NEWS
> @@ -24,6 +24,10 @@ applies, and please also update docstrings as needed.
> \f
> * Installation Changes in Emacs 27.1
>
> +** Extend function 'map-into'.
> +Add a 'map-into' method to have hash table creation parameters
> +tweak-able.
> +
> ** Emacs now uses GMP, the GNU Multiple Precision library.
> By default, if 'configure' does not find a suitable libgmp, it
> arranges for the included mini-gmp library to be built and used.
> diff --git a/lisp/emacs-lisp/map.el b/lisp/emacs-lisp/map.el
> index 54e802e..dfc1500 100644
> --- a/lisp/emacs-lisp/map.el
> +++ b/lisp/emacs-lisp/map.el
> @@ -338,7 +338,8 @@ map-every-p
> t))
>
> (defun map-merge (type &rest maps)
> - "Merge into a map of type TYPE all the key/value pairs in MAPS."
> + "Merge into a map of type TYPE all the key/value pairs in MAPS.
> +See `map-into' for all supported values of TYPE."
> (let ((result (map-into (pop maps) type)))
> (while maps
> ;; FIXME: When `type' is `list', we get an O(N^2) behavior.
> @@ -354,7 +355,8 @@ map-merge-with
> "Merge into a map of type TYPE all the key/value pairs in MAPS.
> When two maps contain the same key (`eql'), call FUNCTION on the two
> values and use the value returned by it.
> -MAP can be a list, hash-table or array."
> +MAP can be a list, hash-table or array.
> +See `map-into' for all supported values of TYPE."
> (let ((result (map-into (pop maps) type))
> (not-found (cons nil nil)))
> (while maps
> @@ -458,17 +460,28 @@ map-do
> (funcall function index elt))
> array))
>
> -(cl-defmethod map-into (map (_type (eql hash-table)))
> - "Convert MAP into a hash-table."
> - ;; FIXME: Just knowing we want a hash-table is insufficient, since that
> - ;; doesn't tell us the test function to use with it!
> - (let ((ht (make-hash-table :size (map-length map)
> - :test 'equal)))
> +(defsubst map--into-hash (map keyword-args)
> + "Convert MAP into a hash-table.
> +KEYWORD-ARGS are forwarded to `make-hash-table'."
> + (let ((ht (apply #'make-hash-table keyword-args)))
> (map-apply (lambda (key value)
> (setf (map-elt ht key) value))
> map)
> ht))
>
> +(cl-defmethod map-into (map (_type (eql hash-table)))
> + "Convert MAP into a hash-table."
> + (map--into-hash map (list :size (map-length map) :test 'equal)))
> +
> +(cl-defmethod map-into (map (args (head hash-table)))
> + "Convert MAP into a hash-table.
> +ARGS is a list where the car is 'hash-table' and the cdr are the keyword-args
> + forwarded to `make-hash-table'.
> +
> +Example:
> + (map-into '((1 . 3)) '(hash-table :test eql))"
> + (map--into-hash map (cdr args)))
> +
> (defun map--make-pcase-bindings (args)
> "Return a list of pcase bindings from ARGS to the elements of a map."
> (seq-map (lambda (elt)
> diff --git a/test/lisp/emacs-lisp/map-tests.el b/test/lisp/emacs-lisp/map-tests.el
> index a54af80..9f61511 100644
> --- a/test/lisp/emacs-lisp/map-tests.el
> +++ b/test/lisp/emacs-lisp/map-tests.el
> @@ -340,7 +340,8 @@ test-map-every-p
>
> (ert-deftest test-map-into ()
> (let* ((alist '((a . 1) (b . 2)))
> - (ht (map-into alist 'hash-table)))
> + (ht (map-into alist 'hash-table))
> + (ht2 (map-into alist '(hash-table :test eq))))
> (should (hash-table-p ht))
> (should (equal (map-into (map-into alist 'hash-table) 'list)
> alist))
> @@ -349,6 +350,8 @@ test-map-into
> (map-keys ht)))
> (should (equal (map-values (map-into (map-into ht 'list) 'hash-table))
> (map-values ht)))
> + (should (equal (map-into ht 'alist) (map-into ht2 'alist)))
> + (should (eq (hash-table-test ht2) 'eq))
> (should (null (map-into nil 'list)))
> (should (map-empty-p (map-into nil 'hash-table)))
> (should-error (map-into [1 2 3] 'string))))
next prev parent reply other threads:[~2019-10-11 16:19 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-04 9:58 new function proposal alist-to-hash Andrea Corallo
2019-10-04 19:16 ` Stefan Monnier
2019-10-05 8:18 ` Andrea Corallo
2019-10-05 15:13 ` Stefan Monnier
2019-10-05 15:45 ` Andrea Corallo
2019-10-05 8:28 ` [PATCH] extend map-into (was: new function proposal alist-to-hash) Andrea Corallo
2019-10-06 14:02 ` [PATCH] extend map-into Stefan Monnier
2019-10-06 20:59 ` Andrea Corallo
2019-10-08 17:29 ` Stefan Monnier
2019-10-08 18:46 ` Andrea Corallo
2019-10-08 20:23 ` Stefan Monnier
2019-10-09 15:35 ` Andrea Corallo
2019-10-09 19:41 ` Stefan Monnier
2019-10-09 20:02 ` Andrea Corallo
2019-10-10 8:27 ` Nicolas Petton
2019-10-10 8:28 ` Nicolas Petton
2019-10-10 10:06 ` Andrea Corallo
2019-10-10 11:47 ` Nicolas Petton
2019-10-11 16:19 ` Stefan Monnier [this message]
2019-10-11 16:29 ` Andrea Corallo
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
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jwvr23jw9dv.fsf-monnier+emacs@gnu.org \
--to=monnier@iro.umontreal.ca \
--cc=akrl@sdf.org \
--cc=emacs-devel@gnu.org \
--cc=nico@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 external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.