* modify-syntax-entry with single and two character comments
@ 2004-10-27 17:55 Spike Ilacqua
2004-10-27 19:11 ` Stefan Monnier
0 siblings, 1 reply; 3+ messages in thread
From: Spike Ilacqua @ 2004-10-27 17:55 UTC (permalink / raw)
I'm trying to build a syntax table for a language that as two comment
modes. "|" starts a single line comment, and works like "#" in Perl.
"|* ... *|" can contain a comment and may be multiple lines, basically
the same a C's "/* ... */". I've tried a number of variations and the
closest I get is:
(modify-syntax-entry ?\n ">" st)
(modify-syntax-entry ?\| "<1b4b" st)
(modify-syntax-entry ?\* ".2b3b" st)
which works for "|* ... *|" and recognizes "|" as the start of a comment
but doesn't see a newline as the end of a comment that starts with "|".
This on the other hand:
(modify-syntax-entry ?\n ">b" st)
(modify-syntax-entry ?\| "<b14" st)
(modify-syntax-entry ?\* ".23" st)
Doesn't recognize the "|* .. *|" comments. Any suggestions on how to
make this work?
One note, I have:
(list "\\(||\\)" 1 '(1 . nil))
in the font-lock-syntactic-keywords to make sure that "||" isn't treated
as a comment. But I don't think that's part of the problem.
Thanks,
->Spike
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: modify-syntax-entry with single and two character comments
2004-10-27 17:55 modify-syntax-entry with single and two character comments Spike Ilacqua
@ 2004-10-27 19:11 ` Stefan Monnier
2004-10-27 20:16 ` Stefan Monnier
0 siblings, 1 reply; 3+ messages in thread
From: Stefan Monnier @ 2004-10-27 19:11 UTC (permalink / raw)
> (modify-syntax-entry ?\n ">" st)
> (modify-syntax-entry ?\| "<1b4b" st)
> (modify-syntax-entry ?\* ".2b3b" st)
The syntax string has the following structure:
- 1st char is the main syntax category.
- 2nd char is only used for ( and ) categories.
- the rest are flags with no ordering.
I.e. in your above code the "<1b4b" is equivalent to "< b4b" because the
`1' is ignored. It's also equivalent to "< 4bb" (because ordering of
flags is ignored) which is equivalent to "< 4b" (because turning ON a flag
twice is the same as turning it ON once).
A correct syntax-table would be:
(modify-syntax-entry ?\n ">" st)
(modify-syntax-entry ?\| "< 14" st)
(modify-syntax-entry ?\* ". 23b" st)
which says:
- | starts a non-b comment and \n ends such a non-b comment.
- | can be the 1nd char of a 2-char comment-starter or the 2nd char of
a 2-char comment-ender.
- * can be the 2nd char of a 2-char b-style comment-starter or the 3rd char
of a 2-char b-style comment-ender.
Sadly, this will not work because current Emacsen will immediately think
that | starts the comment without checking the subsequent char to see if
it's a *.
Please report a bug via M-x report-emacs-bug about it.
To work around this problem, two solutions:
1 - use "| " instead of "|" as the non-b comment-starter:
(modify-syntax-entry ?\n ">" st)
(modify-syntax-entry ?\| ". 14" st)
(modify-syntax-entry ?\* ". 23b" st)
(modify-syntax-entry ?\ " 2" st)
Any char that can reasonably be expected to appear after a |
comment-starter should then have the `2' flag added to its syntax :-(
2 - use font-lock-syntactic-keywords to change the syntax of | when it is
followed by a *. This is less intrusive but will only work when
font-lock is used and has been applied to the text.
-- Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: modify-syntax-entry with single and two character comments
2004-10-27 19:11 ` Stefan Monnier
@ 2004-10-27 20:16 ` Stefan Monnier
0 siblings, 0 replies; 3+ messages in thread
From: Stefan Monnier @ 2004-10-27 20:16 UTC (permalink / raw)
> Sadly, this will not work because current Emacsen will immediately think
> that | starts the comment without checking the subsequent char to see if
> it's a *.
> Please report a bug via M-x report-emacs-bug about it.
Actually, don't bother: I just fixed it in Emacs-CVS.
Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread
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2004-10-27 17:55 modify-syntax-entry with single and two character comments Spike Ilacqua
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