[ragel-users] One question.

[Adrian Thurston]

To expand on this a bit ... it is entirely up to the user to manage the 
stack allocation. Ragel's support for recursive structures (fcall/fret) 
is an extension to the basic model, which is pure state machine (not a 
PDA). If you find you have a lot recursion in what you need to parse, 
you should consider that ragel might not be the right tool for the job.

Regards

On 03/29/2011 09:59 PM, Nate wrote:
> Yes, see the int[] stack in the link. :) Also note the code under "prepush".
>
> -Nate
>
>
> On Tue, Mar 29, 2011 at 9:38 PM, Gordeev Vladimir
> <gordeev.vladimir.v at gmail.com <mailto:gordeev.vladimir.v at gmail.com>> wrote:
>
>     Hm, this looks like solution. I will try it. Thanks.
>
>     Related question: Does Ragel have some inner stack to handle nested
>     fcall/fret?
>
>
>     On 30.03.2011 00:59, Nate wrote:
>>     You can use fcall to jump to a machine, then fret to resume where
>>     you were. It's a bit tricky, but once you understand it you can
>>     parse recursively. See the startTable action here (though this is
>>     a pretty hairy parser):
>>     http://code.google.com/p/table-layout/source/browse/trunk/build/TableLayoutParser.rl
>>
>>     -Nate
>>
>>
>>     On Tue, Mar 29, 2011 at 2:55 PM, Jonathan Castello
>>     <twisolar at gmail.com <mailto:twisolar at gmail.com>> wrote:
>>
>>         On Tue, Mar 29, 2011 at 1:15 PM, Gordeev Vladimir
>>         <gordeev.vladimir.v at gmail.com
>>         <mailto:gordeev.vladimir.v at gmail.com>> wrote:
>>         > So I got following error:
>>         >
>>         >     test.rl:7:32: graph lookup of "list" failed
>>
>>         The reason you get that error is because a rule can only reference
>>         definitions that came before it. "list" doesn't exist until the
>>         definition is finished, so it can't reference itself. (That would
>>         create a recursive structure anyways, which Ragel isn't
>>         equipped to
>>         handle natively.)
>>
>>         ~Jonathan
>>
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-- 
Adrian D. Thurston
http://www.complang.org/thurston/

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