From: "Pascal J. Bourguignon" <pjb@informatimago.com>
To: help-gnu-emacs@gnu.org
Subject: Re: use Elisp to improve your Elisp - some code issues
Date: Sat, 01 Aug 2015 10:54:22 +0200 [thread overview]
Message-ID: <87twsjv16p.fsf@kuiper.lan.informatimago.com> (raw)
In-Reply-To: mailman.7712.1438402251.904.help-gnu-emacs@gnu.org
Emanuel Berg <embe8573@student.uu.se> writes:
> ;; find the construct (if a a b) if you want to replace it with (or a b)
> ;; if it works, when applied to this file, it should find the example above!
> (search-regexp-in-files (buffer-file-name)
> "([[:space:]\n]*if[[:space:]\n]+\\(.*\\)[[:space:]\n]+\\1[[:space:]\n]+\\(.*\\))"
Perhaps you have notied some discrepancy here.
Check: https://en.wikipedia.org/wiki/Chomsky_hierarchy
You may use read, or forward-sexp / backward-sexp and down-lisp /
up-list, to walk the sexps of the buffer in such a way that now you can
check for source patterns instead of text patterns.
Not that in this case you may want to use it, but it might still be
better to write:
(map-sexp-in-files
(lambda (form)
(cond
((atom form) form)
((and (eql (first form) 'if)
(eql (second form) (third form))) ; eql ensures we don't
;; substitute expressions that may have side effects.
`(or ,(second form) ,@(cdddr form)))
(t form)))
(list (buffer-file-name)))
or:
(require 'pjb-pmatch)
(map-sexp-in-files
(lambda (form)
(match-case form
((if (!v a) (!v a) (!! (!x e)))
`(or ,a ,e))
(otherwise form)))
(list (buffer-file-name)))
--
__Pascal Bourguignon__ http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
dog. The man will be there to feed the dog. The dog will be there to
keep the man from touching the equipment.” -- Carl Bass CEO Autodesk
next prev parent reply other threads:[~2015-08-01 8:54 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.7671.1438302261.904.help-gnu-emacs@gnu.org>
2015-07-31 2:39 ` use Elisp to improve your Elisp - some code issues Pascal J. Bourguignon
2015-08-01 4:09 ` Emanuel Berg
[not found] ` <mailman.7712.1438402251.904.help-gnu-emacs@gnu.org>
2015-08-01 8:54 ` Pascal J. Bourguignon [this message]
2015-08-01 12:41 ` Emanuel Berg
[not found] ` <mailman.7727.1438432975.904.help-gnu-emacs@gnu.org>
2015-08-01 15:59 ` Pascal J. Bourguignon
2015-08-02 0:06 ` Emanuel Berg
2015-08-03 1:23 ` Ian Zimmerman
[not found] ` <mailman.7751.1438474104.904.help-gnu-emacs@gnu.org>
2015-08-02 0:44 ` Pascal J. Bourguignon
2015-08-02 1:29 ` Emanuel Berg
2015-08-02 15:36 ` Robert Thorpe
2015-08-02 16:44 ` Pascal J. Bourguignon
2015-08-05 23:40 ` Emanuel Berg
2015-08-06 0:59 ` John Mastro
[not found] ` <mailman.7758.1438529790.904.help-gnu-emacs@gnu.org>
2015-08-02 16:25 ` Rusi
2015-08-01 16:13 ` Michael Heerdegen
2015-07-31 20:24 ` Sam Halliday
2015-08-01 4:20 ` Emanuel Berg
2015-08-01 6:26 ` Marcin Borkowski
[not found] ` <mailman.7714.1438410426.904.help-gnu-emacs@gnu.org>
2015-08-01 8:57 ` Pascal J. Bourguignon
2015-08-01 12:48 ` Emanuel Berg
2015-08-01 13:05 ` Marcin Borkowski
2015-08-01 13:14 ` Emanuel Berg
2015-08-01 13:21 ` Emanuel Berg
[not found] ` <mailman.7713.1438402953.904.help-gnu-emacs@gnu.org>
2015-08-02 10:42 ` Sam Halliday
2015-08-05 23:21 ` Emanuel Berg
2015-07-31 0:22 Emanuel Berg
2015-07-31 2:30 ` Marcin Borkowski
2015-07-31 7:42 ` Stefan Monnier
2015-07-31 12:11 ` Navy Cheng
2015-08-03 7:56 ` Tassilo Horn
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