Received: (at 59786) by debbugs.gnu.org; 13 Jan 2023 13:48:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Jan 13 08:48:06 2023 Received: from localhost ([127.0.0.1]:49905 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1pGKPe-00063X-5e for submit <at> debbugs.gnu.org; Fri, 13 Jan 2023 08:48:06 -0500 Received: from mout.web.de ([212.227.15.4]:59201) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <michael_heerdegen@HIDDEN>) id 1pGKPc-00062M-AF for 59786 <at> debbugs.gnu.org; Fri, 13 Jan 2023 08:48:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=s29768273; t=1673617674; bh=nab5GbTjOU/8czPCqx5u5r26AUBPzLxV2zsUF4wZF30=; h=X-UI-Sender-Class:From:To:Cc:Subject:In-Reply-To:References:Date; b=TKU/pcHZGS8OqmK1jC5sjfY6fPao2JaXTkfqzZubL36E/L2rsc11O24E2mVM3VoTc ezgMuAI4FBOS9T7lwe7vtUBhPG2A4oXxaXqARutBDqf7fdQ1OyyH3r12TO1QN+M6zw z6938RSc64sEU04y18awDHH2+XAkbGyt6qF20QzH1fEapO1TCJdaL0qLaUc3xJHFU1 67nz8l6fj8Iy/+ohTWJSvdFb4nPH8TgReNIjHOPfLOJbjJubJHFBbIQ5K+VdqtiNDZ H3wyCq1oyj1yvAU+VFRlmtzpfS4enM2iCqP4GlBuHKM1Cq99ZOLkk6UyoivBzatsCe GWhdANXwxqSpg== X-UI-Sender-Class: 814a7b36-bfc1-4dae-8640-3722d8ec6cd6 Received: from drachen.dragon ([84.59.210.57]) by smtp.web.de (mrweb005 [213.165.67.108]) with ESMTPSA (Nemesis) id 1N9LEG-1odt5a05G0-015Kz2; Fri, 13 Jan 2023 14:47:54 +0100 From: Michael Heerdegen <michael_heerdegen@HIDDEN> To: Stefan Monnier <monnier@HIDDEN> Subject: Re: bug#59786: Allowing arbitrary expressions in cl-labels In-Reply-To: <jwv359xr3oy.fsf@HIDDEN> (Stefan Monnier's message of "Fri, 02 Dec 2022 14:44:13 -0500") References: <jwv359xr3oy.fsf@HIDDEN> Date: Fri, 13 Jan 2023 14:47:52 +0100 Message-ID: <87r0vybl6f.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Provags-ID: V03:K1:qYyZMFEfQbE4UY73cK+vjnxTx1NUGWNPd/t2teNqGREsH3eTniF /SO6Ym6DiELZUX6wNcGiyjSy5hwkPCElAO4kx+nRdeNJS0LRLW7nqxhDIUdFCn2R4FfQXyL 5JqFfin2kQCr4IsWHh1Nia622/8efZ1MgzzWD9DV2lF/FkSJKHMJeE5Ei7jLpBzBU6qlOkv HupMRDz6JruH26ryULVfQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:DVXbCAW74z4=;bpkqgxEbOO4WTfCDvvWpDWYDw7p 4QH3OB3CqqVyzG0H62XPuyvc1OXUSxnAK4JhrlPNp9bVYJlsoZC8sYhsbO7bCtTd2dXeYOCeL BqJYdEPb//IEXTTvYLzHIw9pb35D+sTE4+lXbrqow90X3a0vg+JeRn6+uD3P6o6DBjBgcqPFL 3CbUKOe12zGyCKu35teni8IMUhPX3+U+SW1QfP+zN6DZdHSn/ZqYdHG/z2chUyc6TzLrs+6a5 UmKiWo+VFWvTySYSvWAHmGmsqQkrO96tkS3P4Hckcf8QBevnsggvsuHWRXpBDKKdez2z/ZpIS Viu3jXyc0zkpyo1skvXq3EkKSwn6H4zWrnqGVYTU1fy212UCTgQmf9G3AUPqVyXLkh40xCf9n 8z3NlPPNAZq8gsnicU9Z4jgg9l6F8L1JW+LSB8ZaTBYhKfQCnLP9QYs+JO0ajSkk5/3d9Rdxn cU+GsoUfNsdRvfeEEQW2rnArIr+UxbB4rkA4Ak7TQSsxuncdoRYK6VvuLSDO/xrBRHHB/M8EU nVxgiM89VyTmwM1k3u2BsUYR915zLHJ0MPXEMDCKbjX7QbIibQtrPJfbtnh6jo6066NBx+yF4 uPffSiJjam8AUkEOgdrKKJ+hH4qzHvwnzVInvOfcJ4JnvHkkm8dQC8X1K5I/dGWdhs+/MmYil LAc/SgrJKsR90USpP/qIjQvRzcpnB7EdfnwRNdcw0g+djo0y17JbLfav6lZQ27T8NZPe73vAF LR/XMRBNEW9s0ZVgNjbGFkZTs3RVvjnanZJKKIJ6oFB1cw8EGAaqEvjwYAfnOYGRn4gjeX42R lut3e7NVefF7sSc/NziygQPhgxiFk8JpujohBWf6q+tnL/I6FE2ATKDM/lej7HG6CnXhme5vo t08xh7cS488R75YgSc3uSDP2bbNq4GceE1j6OIE9TVceCZ6DqzkS8COwc5+1ZnZkykK7tn8+l eVYSFhrZno7xLWP6pa1hUXMAQJA= X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 59786 Cc: 59786 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) Stefan Monnier <monnier@HIDDEN> writes: > The patch below uses this "new new" syntax (and adjusts `cl-flet` to > also support this new new syntax). It still lacks a NEWS entry (as > well as updating the CL manual), but before I do that, I'd like to hear > what other people think, I like the idea to implement this kind of feature for `cl-labels'. It's a good change IMO. I don't like the syntax I think (ugly). The rest of this answer is discussing this detail: I don't recall all details about the ambiguity of the empty body case, so forgive me if I'm missing something. A binding like (my-fun (var1 var2)) with an empty body would give you compiler warnings anyway. Would this be an alternative to your "=" style syntax: To specify a local function with an empty body one would have to use local variable names starting with "_": (my-fun (_var1 _var2)) If not all variables start with an underscore or not all list members are symbols, the binding is interpreted as specifying an expression evaluating to the function to bind. This assumes that "_var" never specifies a named function. Michael.
bug-gnu-emacs@HIDDEN:bug#59786; Package emacs.
Full text available.Stefan Kangas <stefankangas@HIDDEN>
to control <at> debbugs.gnu.org.
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(Shocking, I know.) In this=20 case, `cl-labels' should emulate CL's `labels'. It's bad enough that we've added some non-CL stuff to our CL library over the years (instead of putting it elsewhere and not giving it prefix `cl-'). It's worse when we co-opt a CL name to do something other than emulate the CL thingie that has that name. It's fine for Emacs Lisp to add whatever we like, including a `labels'-like function that acts differently from CL `labels'. What's misguided, IMO, is for us to use the name `cl-labels' for such non-`labels' behavior. Add a new function for that, without prefix `cl-'. I'd even like to see us backtrack on the other, divergences from CL emulation that use CL names=20 (but with prefix `cl-'). Just one opinion.
bug-gnu-emacs@HIDDEN:bug#59786; Package emacs.
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From: Stefan Monnier <monnier@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: Allowing arbitrary expressions in cl-labels
Date: Fri, 02 Dec 2022 14:44:13 -0500
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--=-=-=
Content-Type: text/plain
Tags: patch
I have found some circumstances where I'd like to write things like:
(cl-labels ((f1 (if blabla
(lambda (x) (do one thing))
(lambda (x) (do another thing))))
(f2 (if bleble
(lambda (y) (do some thing))
(lambda (y) (do some other thing)))))
...)
I.e. define two, mutually-recursive functions, but where I want to
perform some computation before "building/returning" each function.
I could rewrite the above to
(cl-labels ((f1 (x) (if blabla
(do one thing)
(do another thing)))
(f2 (y) (if bleble
(do some thing)
(do some other thing))))
...)
but then the `if` tests are repeated at each call.
I could also rewrite it to
(letrec ((f1 (if blabla
(lambda (x) (do one thing))
(lambda (x) (do another thing))))
(f2 (if bleble
(lambda (y) (do some thing))
(lambda (y) (do some other thing)))))
...)
but then I have to use (funcall f1 ..) and (funcall f2 ...) instead of
just (f1 ...) and (f2 ...). I could add a (cl-flet ((f1 f1) (f2 f2)) ...)
but that's inconvenient, especially because I'd have to add it in
various places.
So I'd like to propose to extend `cl-labels` in the same way that
`cl-flet` was extended to allow each function to be defined by an
expression that returns a function rather than by "args + body".
One option is to use the same approach as I used in `cl-flet`,
i.e. allow each binding to be either
(FUNC ARGS BODY...) the normal existing syntax
or
(FUNC EXP) the new syntax
After I introduced this in `cl-flet` it was pointed out that it was an
incompatible change since BODY... can be the empty list. Another option
is to use a syntax like:
(FUNC = EXP) the new new syntax
which should not suffer from such incompatibility since ARGS should
never be of the form `=`.
The patch below uses this "new new" syntax (and adjusts `cl-flet` to
also support this new new syntax). It still lacks a NEWS entry (as
well as updating the CL manual), but before I do that, I'd like to hear
what other people think,
Stefan
In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars) of 2022-11-29 built on pastel
Repository revision: 4254a4a71d5d04cfcefaedfefe5d22af55650a6a
Repository branch: work
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)
Configured using:
'configure -C --enable-checking --enable-check-lisp-object-type --with-modules --with-cairo --with-tiff=ifavailable
'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign'
PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'
--=-=-=
Content-Type: text/patch
Content-Disposition: attachment; filename=cl-labels.patch
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 43a2ed92059..cc8c98f2264 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -2028,11 +2028,11 @@ cl--labels-convert
;;;###autoload
(defmacro cl-flet (bindings &rest body)
"Make local function definitions.
-Each definition can take the form (FUNC EXP) where
+Each definition can take the form (FUNC = EXP) where
FUNC is the function name, and EXP is an expression that returns the
function value to which it should be bound, or it can take the more common
form (FUNC ARGLIST BODY...) which is a shorthand
-for (FUNC (lambda ARGLIST BODY)).
+for (FUNC = (lambda ARGLIST BODY)).
FUNC is defined only within FORM, not BODY, so you can't write
recursive function definitions. Use `cl-labels' for that. See
@@ -2055,8 +2055,12 @@ cl-flet
(if (and (= (length args-and-body) 1) (symbolp (car args-and-body)))
;; Optimize (cl-flet ((fun var)) body).
(setq var (car args-and-body))
- (push (list var (if (= (length args-and-body) 1)
- (car args-and-body)
+ (push (list var (cond
+ ((= (length args-and-body) 1) ;Obsolete syntax.
+ (car args-and-body))
+ ((eq '= (car args-and-body))
+ (macroexp-progn (cdr args-and-body)))
+ (t
`(cl-function (lambda . ,args-and-body))))
binds))
(push (cons (car binding)
@@ -2203,12 +2207,13 @@ cl--self-tco
;;;###autoload
(defmacro cl-labels (bindings &rest body)
"Make local (recursive) function definitions.
-+BINDINGS is a list of definitions of the form (FUNC ARGLIST BODY...) where
-FUNC is the function name, ARGLIST its arguments, and BODY the
-forms of the function body. FUNC is defined in any BODY, as well
-as FORM, so you can write recursive and mutually recursive
-function definitions. See info node `(cl) Function Bindings' for
-details.
+BINDINGS is a list of definitions of the form either:
+- (FUNC ARGLIST BODY...) where FUNC is the function name,
+ ARGLIST its arguments, and BODY the forms of the function body.
+- (FUNC = BODY) where BODY is an expression that evaluates to a function.
+FUNC is defined in any BODY, as well as FORM, so you can write recursive
+and mutually recursive function definitions.
+See info node `(cl) Function Bindings' for details.
\(fn ((FUNC ARGLIST BODY...) ...) FORM...)"
(declare (indent 1) (debug cl-flet))
@@ -2226,17 +2231,31 @@ cl-labels
(unless (assq 'function newenv)
(push (cons 'function #'cl--labels-convert) newenv))
;; Perform self-tail call elimination.
- (setq binds (mapcar
- (lambda (bind)
- (pcase-let*
- ((`(,var ,sargs . ,sbody) bind)
- (`(function (lambda ,fargs . ,ebody))
- (macroexpand-all `(cl-function (lambda ,sargs . ,sbody))
- newenv))
- (`(,ofargs . ,obody)
- (cl--self-tco var fargs ebody)))
- `(,var (function (lambda ,ofargs . ,obody)))))
- (nreverse binds)))
+ (setq binds
+ (mapcar
+ (lambda (bind)
+ (pcase-let*
+ ((`(,var ,sargs . ,sbody) bind))
+ (list var
+ (named-let loop
+ ((mfunexp (macroexpand-all
+ (if (eq '= sargs)
+ (macroexp-progn sbody)
+ `(cl-function (lambda ,sargs . ,sbody)))
+ newenv)))
+ (pcase mfunexp
+ (`#'(lambda ,fargs . ,ebody)
+ `#'(lambda . ,(cl--self-tco var fargs ebody)))
+ (`(progn . ,exps)
+ `(progn ,@(butlast exps) ,(loop (car (last exps)))))
+ (`(let ,bindings ,exps)
+ `(let ,bindings
+ ,@(butlast exps) ,(loop (car (last exps)))))
+ (`(if ,exp1 ,exp2 ,exps)
+ `(if ,exp1 ,(loop exp2)
+ ,@(butlast exps) ,(loop (car (last exps)))))
+ (_ mfunexp))))))
+ (nreverse binds)))
`(letrec ,binds
. ,(macroexp-unprogn
(macroexpand-all
--=-=-=--
Stefan Monnier <monnier@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#59786; Package emacs.
Full text available.
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Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.