GNU bug report logs - #23005
24.4; regexp replace evaluating replacements in incorrect order

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ernesto Alfonso <erjoalgo <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4; regexp replace evaluating replacements in incorrect order
Date: Sun, 13 Mar 2016 17:17:16 -0700

when using replace-regexp with both expressions (ie \,) and simple
string replacements (ie \?), the expression replacement is evaluated
first, even if it comes after the \? replacement.

Example:

Replace regexp (default '.*?', *'.*' -> '\?', '\,(read-string "silly
expression")'):

the (read-string "silly expression") is evaluated before the first "\?".



In GNU Emacs 24.4.1 (x86_64-pc-linux-gnu, GTK+ Version 3.14.5)
 of 2015-03-07 on trouble, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.3 (jessie)

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
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 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.4/site-lisp:/usr/share/emacs/site-lisp
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 'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
 -Werror=format-security -Wall' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-z,relro'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Javascript

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Message #8 received at 23005 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ernesto Alfonso <erjoalgo <at> gmail.com>
Cc: 23005 <at> debbugs.gnu.org
Subject: Re: bug#23005: 24.4; regexp replace evaluating replacements in
 incorrect order
Date: Mon, 29 Jul 2019 14:59:21 +0200

Ernesto Alfonso <erjoalgo <at> gmail.com> writes:

> when using replace-regexp with both expressions (ie \,) and simple
> string replacements (ie \?), the expression replacement is evaluated
> first, even if it comes after the \? replacement.
>
> Example:
>
> Replace regexp (default '.*?', *'.*' -> '\?', '\,(read-string "silly
> expression")'):
>
> the (read-string "silly expression") is evaluated before the first "\?".

I'm not sure this is a bug -- the doc string doesn't say anything about
the order these things are done in.  On the other hand, it doesn't seem
very useful to do the evaluation first.  If the evaluation could return
things like \&, then perhaps doing it first would be useful...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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