unofficial mirror of help-gnu-emacs@gnu.org
 help / color / mirror / Atom feed
From: "Stefan Monnier" <monnier@iro.umontreal.ca>
Subject: Re: syntax table entries for comments
Date: Tue, 09 Sep 2003 13:34:55 GMT	[thread overview]
Message-ID: <jwv3cf6gk5e.fsf@noir.iro.umontreal.ca> (raw)
In-Reply-To: 3f5db647$0$35674$1b62eedf@news.wanadoo.nl

> language that contains two types of comments. The first is for large blocks
> and is the familiar /* */ construction. This I can do by looking at the
> examples. The second one is a single-line comment that consists of two
> hyphens, like:
>    -- this is a comment.

Emacs does not properly support this, as you've discovered.

> (defvar nrx-mode-syntax-table nil
>    "Syntax table in use in NRX-mode buffers.")

> (defun nrx-create-syntax-table ()
>    (if nrx-mode-syntax-table
>        ()
>      (setq nrx-mode-syntax-table (make-syntax-table))
>      (modify-syntax-entry ?. "." nrx-mode-syntax-table)
>      (modify-syntax-entry ?- ". 12b" nrx-mode-syntax-table)
>      (modify-syntax-entry ?/ ". 14" nrx-mode-syntax-table)
>      (modify-syntax-entry ?* ". 23" nrx-mode-syntax-table)
>      (modify-syntax-entry ?\n "> b" nrx-mode-syntax-table)
>      (modify-syntax-entry ?\' "\"" nrx-mode-syntax-table))

>    (set-syntax-table nrx-mode-syntax-table))

Could you tell me the place from which this code was inspired so we can
fix it ?  It should look like:

   (defvar nrx-mode-syntax-table
     (let ((st (make-syntax-table)))
       (modify-syntax-entry ...)
       (modify-syntax-entry ...)
       ...
       st))

and the `set-syntax-table' is commonly done implicitly by
`define-derived-mode'.

> This works but also renders the combination -* and *- as comment start and
> end, which is wrong. Could anyone please tell me what I'm missing?

Nothing, really, other than the fact that it's a limitation of current
syntax-tables.  You can either hack on src/syntax.c to add support for
such cases, or use font-lock-syntactic-keywords to recognize `--'
and mark it as a comment starter.


        Stefan

  reply	other threads:[~2003-09-09 13:34 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-09-08  5:39 syntax table entries for comments Arjan Bos
2003-09-09 13:34 ` Stefan Monnier [this message]
2003-09-10 13:35   ` Arjan Bos
2003-09-10 15:04     ` Stefan Monnier
2003-09-11  5:48       ` Arjan Bos

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

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=jwv3cf6gk5e.fsf@noir.iro.umontreal.ca \
    --to=monnier@iro.umontreal.ca \
    /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.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).