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| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: gcc needs a curly bracket matching/counting function |
| Date | 2016-12-20 21:55 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <87d1gme052.fsf@bsb.me.uk> (permalink) |
| References | <o3a201$nfs$1@dont-email.me> <o3a38b$qhp$1@dont-email.me> <o3a8if$1rg$1@dont-email.me> <87zijq5y6s.fsf@bsb.me.uk> <o3bu7i$msb$1@dont-email.me> |
BartC <bc@freeuk.com> writes:
> On 20/12/2016 17:04, Ben Bacarisse wrote:
<snip>
>> ... You have to get the lexing right:
>>
>> /* /* { ignore */
>> // and the next\
>> {
>>
>> which varies by language standard:
>>
>> {a//*}*//b}
>>
>> Then there are
>>
>> void f() <% ??>
>>
>> to contend with, and if that were not enough there's the [preprocessor]:
>>
>> #define OPEN {
>>
>> int main(void) OPEN }
>
> You make the problems sound insurmountable (and you left out
> conditional code!).
I was only getting started!
I didn't want to make it sound insurmountable -- I wanted to make it
sound interesting, and to encourage some simplification. Emacs's C mode
gets confused by most of these things and it doesn't bother me a bit.
In fact, I use it as a sign that I should redesign.
<snip>
> I doubt you're going to come across trigraphs, if that's what the <%
> ??> example means (and again, there will be a trigraph for the other
> brace).
The <% and %> are not trigraphs but alternative spellings. You can
write if (x) <% ... %> but puts("<%%>") will not print {}. In contrast,
puts("??<??>") must print {}.
> And unbalanced { or } within a comment are going to be rare. (They're
> more likely to come up in lexing code funnily enough:
>
> if (c == '{') // now look for }
Yes. I used to set a simplified version of this as an exercise and the
final test case was all the students' programs.
> That leaves unbalanced { and } within string literals and perhaps
> within #define like your example. But strings and #defines are easy to
> identify.
Strings are not always obvious:
#define S(a,b) #a#b
...
puts(S(},{));
(I once had to write a lot of test cases for a C compiler.)
--
Ben.
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gcc needs a curly bracket matching/counting function DFS <nospam@dfs.com> - 2016-12-19 20:38 -0500
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 01:59 +0000
Re: gcc needs a curly bracket matching/counting function DFS <nospam@dfs.com> - 2016-12-19 22:30 -0500
Re: gcc needs a curly bracket matching/counting function Robert Spanjaard <spamtrap@arumes.com> - 2016-12-20 11:46 +0100
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 13:20 +0000
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 13:30 +0000
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-20 05:35 -0800
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-21 12:07 +0100
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-21 12:46 +0000
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-21 15:10 +0100
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-21 17:10 +0000
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-21 19:50 +0100
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-21 20:15 +0000
Re: gcc needs a curly bracket matching/counting function Ike Naar <ike@iceland.freeshell.org> - 2016-12-21 22:36 +0000
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-21 23:46 +0000
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-22 01:54 +0000
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-22 12:16 +0000
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-22 13:06 +0000
Re: gcc needs a curly bracket matching/counting function asetofsymbols@gmail.com - 2016-12-22 05:25 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-22 13:34 +0000
Re: gcc needs a curly bracket matching/counting function asetofsymbols@gmail.com - 2016-12-22 08:16 -0800
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-22 09:30 -0800
Re: gcc needs a curly bracket matching/counting function luser droog <luser.droog@gmail.com> - 2016-12-22 09:40 -0800
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-22 05:33 -0800
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-22 05:41 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-22 14:53 +0000
Re: gcc needs a curly bracket matching/counting function asetofsymbols@gmail.com - 2016-12-22 08:11 -0800
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-22 08:27 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-22 16:48 +0000
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-22 09:27 -0800
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-22 20:12 +0000
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-22 12:18 -0800
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-21 09:04 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-21 17:24 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-21 09:41 -0800
Re: gcc needs a curly bracket matching/counting function Ian Collins <ian-news@hotmail.com> - 2016-12-22 18:10 +1300
Re: gcc needs a curly bracket matching/counting function Ian Collins <ian-news@hotmail.com> - 2016-12-29 14:50 +1300
Re: gcc needs a curly bracket matching/counting function Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-02 02:07 -0800
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2017-01-02 11:16 +0100
Re: gcc needs a curly bracket matching/counting function Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-28 16:40 -0800
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-21 08:52 -0800
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-21 20:16 +0100
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-22 09:41 +0100
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-20 17:04 +0000
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 18:46 +0000
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-20 21:55 +0000
Re: gcc needs a curly bracket matching/counting function DFS <nospam@dfs.com> - 2016-12-20 13:52 -0500
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 19:09 +0000
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 19:14 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 12:16 -0800
Re: gcc needs a curly bracket matching/counting function Gareth Owen <gwowen@gmail.com> - 2016-12-20 20:53 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 13:51 -0800
Re: gcc needs a curly bracket matching/counting function Gareth Owen <gwowen@gmail.com> - 2016-12-29 18:49 +0000
Re: gcc needs a curly bracket matching/counting function Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-28 16:36 -0800
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-29 12:44 +0100
Re: gcc needs a curly bracket matching/counting function bart4858@gmail.com - 2016-12-20 13:25 -0800
Re: gcc needs a curly bracket matching/counting function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-20 13:39 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 21:58 +0000
Re: gcc needs a curly bracket matching/counting function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-20 14:05 -0800
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-20 22:17 +0000
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2017-01-26 19:03 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 14:31 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 23:21 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 15:51 -0800
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-21 00:38 +0000
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2017-01-26 19:11 +0000
Re: gcc needs a curly bracket matching/counting function mark.bluemel@gmail.com - 2016-12-20 00:50 -0800
gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-19 18:11 -0800
Re: gcc needs a curly bracket matching/counting function fir <profesor.fir@gmail.com> - 2016-12-20 03:00 -0800
Re: gcc needs a curly bracket matching/counting function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-20 03:50 -0800
Re: gcc needs a curly bracket matching/counting function fir <profesor.fir@gmail.com> - 2016-12-20 05:20 -0800
Re: gcc needs a curly bracket matching/counting function DFS <nospam@dfs.com> - 2016-12-20 13:46 -0500
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 18:59 +0000
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 19:02 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 12:13 -0800
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 20:25 +0000
Re: gcc needs a curly bracket matching/counting function Robert Spanjaard <spamtrap@arumes.com> - 2016-12-20 20:35 +0100
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-20 08:56 +0100
Re: gcc needs a curly bracket matching/counting function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-20 02:26 -0800
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 10:41 +0000
Re: gcc needs a curly bracket matching/counting function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-20 02:52 -0800
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 11:00 +0000
Re: gcc needs a curly bracket matching/counting function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-20 03:19 -0800
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 11:31 +0000
Re: gcc needs a curly bracket matching/counting function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-20 17:21 +0000
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 17:49 +0000
Re: gcc needs a curly bracket matching/counting function David Brown <david.brown@hesbynett.no> - 2016-12-21 12:25 +0100
Re: gcc needs a curly bracket matching/counting function Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-29 01:14 -0800
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 09:07 -0800
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 17:14 +0000
Re: gcc needs a curly bracket matching/counting function Keith Thompson <kst-u@mib.org> - 2016-12-20 09:33 -0800
Re: gcc needs a curly bracket matching/counting function Richard Heathfield <rjh@cpax.org.uk> - 2016-12-20 17:39 +0000
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-20 09:45 -0800
Re: gcc needs a curly bracket matching/counting function gazelle@shell.xmission.com (Kenny McCormack) - 2016-12-20 17:56 +0000
Re: gcc needs a curly bracket matching/counting function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-20 10:01 -0800
Re: gcc needs a curly bracket matching/counting function Ian Collins <ian-news@hotmail.com> - 2016-12-21 07:44 +1300
Re: gcc needs a curly bracket matching/counting function BartC <bc@freeuk.com> - 2016-12-20 10:46 +0000
Re: gcc needs a curly bracket matching/counting function Ike Naar <ike@iceland.freeshell.org> - 2016-12-20 22:00 +0000
Re: gcc needs a curly bracket matching/counting function Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-28 16:39 -0800
Re: gcc needs a curly bracket matching/counting function Ken Brody <kenbrody@spamcop.net> - 2016-12-22 12:12 -0500
Re: gcc needs a curly bracket matching/counting function Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-12-22 12:59 -0700
Re: gcc needs a curly bracket matching/counting function Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-28 16:10 -0800
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