[ragel-users] parsing c comments

[Henrique Pantarotto]

Well, I solved this problem by using something like this:

action mark { text_start = fpc; }
action show { printf("'%.*s'\n", fpc - text_start - 1, text_start); }

main := '/*' >mark any* :>> '*/' @show;

I don't know if this is the "correct way" to solve this, but it worked. ;-)


Thanks

On Thu, Sep 15, 2011 at 6:37 PM, Henrique Pantarotto <ragel at henpa.com>wrote:

> Hi, I've read the ragel manual a couple of times and searched the mailing
> list and I couldn't find the solution to this problem. I imagine the
> solution is there somewhere, but I couldn't find it since I couldn't search
> the mailing list archive properly.
>
> BTW, I don't really need to parse c comments, but I found this example to
> match perfectly what I am trying to accomplish. I'm really trying to parse
> and print data separated by a multi-character token.
>
> Page 29 of Ragel 6.7 manual shows an example on how to properly parse C
> language comments, but the action @comm also parses the * caracter at the
> ending "*/" as shown in the Graphviz image.
>
> I tried many ways to solve this problem, but I couldn't do it. Can someone
> help?
>
> action comm { printf("%c", fc); }
> p = "/* foo *** bar */";
>
> I tried:
>
> main := '/*' (any* -- '/*')@comm '*/';
> main := '/*' any*@comm :>> '*/';
> main := '/*' ( ( any @comm )* - ( any* '*/' any* ) ) '*/';
>
> But it always prints: "foo *** bar *" (note the * at the end) and I looking
> for a way for it to print just " foo *** bar ".
>
> Is there an easy way to fix this?
>
>
> Thanks in advance!
>
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