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Re: font-lock and multiline comments
From: |
Stefan Monnier |
Subject: |
Re: font-lock and multiline comments |
Date: |
Fri, 09 Feb 2007 15:28:29 -0500 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.93 (gnu/linux) |
> I am writing a new major mode for an in-house programming language.
> We'd like to have emacs do syntactic highlighting on the comments. The
> language supports two kinds of comments:
> // In-line C++ style comments
> Comments
> Multi-line comments flagged by Comments/EndComments
> Here is another line
> EndComments
> The in-line style I was able to easily add with a syntax table
> modification. The multi-line comments, however, I can't do because the
> syntax tables only support comment syntax with 1 or 2 characters.
> I then turned to font-lock mode. Adding the following font-lock
> keyword didn't work if there were more than maybe 7 or 8 lines between
> Comments and EndComments:
> '("^[ \t]*Comments\\(.\\|\n\\)*EndComments" . font-lock-comment-face)
> Apparently font-lock regions aren't designed to span multiple lines?
> Can someone tell me how to get font-lock to recognize and properly
> mark these multi-line comments?
Use `font-lock-syntactic-keywords' along the lines of
(defvar foo-font-lock-syntactic-keywords
'(("^Comments\\(\n\\)" (1 "< b"))
("EndComments$"
(0 (unless (eq (match-beginning 0) (point-min))
(put-text-property (1- (match-beginning 0)) (match-beginning 0)
'syntax-table (eval-when-compile
(string-to-syntax "> b")))
(put-text-property (1- (match-beginning 0)) (match-end 0)
'font-lock-multiline t)
nil)))))
and then set font-lock-defaults to
(foo-font-lock-keywords ...blablabla...
(font-lock-syntactic-keywords . foo-font-lock-syntactic-keywords))
See the docstring of font-lock-defaults to see how many entries to place
before the f-l-s-k one.
Note that it will not work correctly for
Comments
EndComments
:-(
Stefan