From: David Kastrup <dak@gnu.org>
To: emacs-devel@gnu.org
Subject: Re: Raw string literals in Emacs lisp.
Date: Sun, 03 Aug 2014 09:29:11 +0200 [thread overview]
Message-ID: <87zjfmowu0.fsf@fencepost.gnu.org> (raw)
In-Reply-To: 8738dem5hr.fsf@uwakimon.sk.tsukuba.ac.jp
"Stephen J. Turnbull" <stephen@xemacs.org> writes:
> David Kastrup writes:
>
> > r#"?\" is a complete string. How do you parse it backwards?
>
> By catching the parse error when parsing it as a (normal) string, then
> reparsing it as a raw string (ie, running backwards over the
> characters until you hit the second ?"), and check for a leading #r
> (two tokens of lookahead).
>
> Thanks for the example, David, XEmacs is buggy here (or maybe
> terminating a rawstring with \ will be declared illegal ;-).
Uh, I wasn't planning to trip up XEmacs. At any rate, things can get
more complex, like with
(format "%s%c\n""r#"?\") => "r#\"
"
which is valid Elisp right now and would remain so, but which would look
like containing a valid string r#"?\" after the syntax change when
scanning backwards. It's not like syntax highlighting etc don't revert
to heuristics (like with "(" in first column), but it's still obvious
that this choice is not conflict-free. And I don't see how one could
reasonably get around that without also changing the ending delimiter.
--
David Kastrup
next prev parent reply other threads:[~2014-08-03 7:29 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 19:47 Raw string literals in Emacs lisp Matthew Plant
2014-07-25 19:56 ` Tassilo Horn
2014-07-25 20:06 ` Matthew Plant
2014-07-25 20:15 ` Tassilo Horn
2014-07-25 20:24 ` Matthew Plant
2014-07-25 20:33 ` Tom Tromey
2014-07-25 21:40 ` Matthew Plant
2014-07-26 1:19 ` Stephen J. Turnbull
2014-07-26 5:28 ` Matthew Plant
2014-07-26 5:45 ` chad
2014-07-26 19:39 ` Matthew Plant
2014-07-27 12:27 ` Stephen J. Turnbull
2014-07-27 13:03 ` David Kastrup
2014-07-27 20:58 ` David Caldwell
2014-07-27 23:17 ` Matthew Plant
2014-07-28 18:27 ` Richard Stallman
2014-07-28 19:32 ` Matthew Plant
2014-07-29 19:15 ` Richard Stallman
2014-07-30 0:26 ` Matthew Plant
2014-07-30 4:28 ` Richard Stallman
2014-07-30 18:54 ` Matthew Plant
2014-07-28 2:16 ` Stephen J. Turnbull
2014-07-28 7:43 ` Andreas Schwab
2014-07-30 20:28 ` Ted Zlatanov
2014-07-30 20:41 ` David Caldwell
2014-07-30 20:54 ` Ted Zlatanov
2014-07-30 21:01 ` Matthew Plant
2014-07-30 21:16 ` Ted Zlatanov
2014-07-30 21:19 ` Matthew Plant
2014-07-31 10:13 ` Ted Zlatanov
2014-08-02 8:47 ` Alan Mackenzie
2014-08-02 9:14 ` David Kastrup
2014-08-02 10:23 ` Alan Mackenzie
2014-08-02 15:51 ` Richard Stallman
2014-08-03 6:50 ` Stephen J. Turnbull
2014-08-03 7:29 ` David Kastrup [this message]
2014-08-03 13:12 ` Stephen J. Turnbull
2014-08-03 13:27 ` David Kastrup
2014-08-03 15:01 ` Stephen J. Turnbull
2014-08-04 1:55 ` Richard Stallman
2014-08-04 6:38 ` David Kastrup
2014-08-05 1:41 ` Richard Stallman
2014-08-05 6:15 ` David Kastrup
2014-08-03 13:40 ` David Kastrup
2014-08-03 15:06 ` Stephen J. Turnbull
2014-08-04 1:55 ` Richard Stallman
2014-08-02 9:17 ` Andreas Schwab
2014-07-28 1:29 ` Stephen J. Turnbull
2014-07-26 21:37 ` Thorsten Jolitz
2014-07-29 6:32 ` William Xu
2014-07-29 7:40 ` Andreas Schwab
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=87zjfmowu0.fsf@fencepost.gnu.org \
--to=dak@gnu.org \
--cc=emacs-devel@gnu.org \
/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.