From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Niels Aan de Brugh <nielsadb@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Extending lua-mode syntax table (report from help-gnu-emacs)
Date: Sun, 11 Apr 2010 16:15:46 -0400 [thread overview]
Message-ID: <jwv1velzref.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <v2z3e7525f1004111117p5ab0cb11p8945fa79e106583d@mail.gmail.com> (Niels Aan de Brugh's message of "Sun, 11 Apr 2010 20:17:49 +0200")
> (defun lua-mode ()
> ;; ....
> (set (make-local-variable 'font-lock-defaults)
> '(lua-font-lock-keywords nil nil ((?_ . "w"))))
> (defvar lua-font-lock-keywords
> (eval-when-compile
> (list
> ;; .....
> ;; Long strings.
> '("\\(?:^\\|[^[-]\\)\\(\\[\\(=*\\)\\[\\(?:.\\|\n\\)*?\\]\\2\\]\\)"
> (1 "\""))
You want to use font-lock-syntactic-keywords. E.g. (warning: 100%
guaranteed untested code ahead):
(defun lua-mode ()
;; ....
(set (make-local-variable 'font-lock-defaults)
'(lua-font-lock-keywords nil nil ((?_ . "w")) nil
(font-lock-syntactic-keywords . lua-font-lock-syntactic-keywords)))
(defvar lua-font-lock-syntactic-keywords
(eval-when-compile
(list
;; .....
;; Long strings.
'("\\(\\[\\)\\[\\|]\\(]\\)"
(1 (if (null (nth 8 (syntax-ppss))) "\"") nil lax)
(2 (if (nth 8 (syntax-ppss)) "\"") nil lax)))))
> (defun lua-syntax-status ()
> "Returns the syntactic status of the character after the point."
> (parse-partial-sexp (save-excursion (beginning-of-line) (point))
> (point)))
(save-excursion (beginning-of-line) (point)) can be replaced by
(line-beginning-position).
> (defun lua-string-p ()
> "Returns true if the point is in a string."
> (elt (lua-syntax-status) 3))
> As you can see, the parse-partial-sexp function gets a range of text
> from the start of the line until the point. The long strings can span
> multiple lines (in fact, that's the whole point). So I'm worried that
> the parse-partial-sexp doesn't have enough context to work with. Is
> this true?
Yes.
> If so, is there a work-around (other than parsing from the start of
> the buffer), or do I need to implement something clever and specific?
You'll probably want to use (syntax-ppss) as a replacement for
(lua-syntax-status), which does exactly the same thing except that it
parses the whole buffer, but uses caching internally to try and make it
still fast enough.
Stefan
prev parent reply other threads:[~2010-04-11 20:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-11 18:17 Extending lua-mode syntax table (report from help-gnu-emacs) Niels Aan de Brugh
2010-04-11 20:15 ` Stefan Monnier [this message]
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