[ragel-users] combining ragel and lemon

Adrian Thurston thurston at colm.net
Tue Oct 15 07:11:11 EDT 2019

Hi Rajeev,

Those are entry points you can use during initialization to start 
parsing somewhere other than "main". You can also use them to jump to 
other parts from action code. To remove them from output use the noentry 
write option to the write data command:

write data noentry;


On 2019-10-14 15:04, Rajeev Bharol wrote:
> Hi
> I am using ragel 6.10 and it generates following unused variables that
> GCC compiler complains about. Is it a bug.
> static const int json_en_rest_array = 12;
> static const int json_en_rest_object = 32;
> static const int json_en_main = 1;
> Thanks
> Rajeev
> On Fri, Aug 16, 2019 at 10:07 AM Mark Olesen
> <Mark.Olesen at esi-group.com> wrote:
>> I've use ragel in a few places already for parsing, but now I'm
>> looking
>> to port over a medium sized chunk of flex/bison. Perhaps going for a
>> ragel/lemon combination.
>> According to the lemon docs
>> (https://www.hwaci.com/sw/lemon/lemon.html)
>> the parser is the one calling the lexer. But this seems to be the
>> same
>> as ragel would like to be doing: match a pattern, call an action.
>> The few examples of ragel/lemon that I've found (the classic
>> calculator,
>> or a json parser) seem to be handling this by running ragel as the
>> scanner, and calling the lemon parser in its actions.
>> Some other examples I've seen use re2c for the lexing part. This
>> appears
>> to fit better with what lemon expects, but there must be some way to
>> lex
>> a single token and return from ragel I suspect.
>> I would be thankful for ideas.
>> Cheers,
>> /mark
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Dr. Adrian D. Thurston
Chief Scientist
Colm Networks

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