[ragel-users] parsing c comments

[Matt Mongeau]

There is also an example in the documentation (search for CDATA_body).

On Fri, Sep 16, 2011 at 2:31 PM, Adrian Thurston <thurston at complang.org> wrote:
> Either you have to hack the string you've captured, like you did in this
> solution, or you have to use a scanner. This parsing problem requires
> delaying the action on the first '*' since you don't know if it is a
> containing '*', or the first character in the terminating string.
>
> On 11-09-16 11:12 AM, Henrique Pantarotto wrote:
>>
>> 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
>> <mailto: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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>
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