[ragel-users] Something like #define macros for Ragel grammar?

[Alan West]

Not tried it but maybe something like this works on gcc:

cpp -dU -P -CC -o output.rl macroedsource.rl

On 16 Dec 2010, at 17:34, Adrian Thurston <adrian.thurston at esentire.com> wrote:

> This has been a desired feature for many years. A few times I've sketched out a solution, but it has never materialized. Your request has been noted it bumps the relative priority.
> 
> Thanks,
> Adrian
> 
> On 10-12-08 01:23 PM, Iñaki Baz Castillo wrote:
>> Hi, my Ragel grammar have many lines like "Via" below:
>> 
>>  via_parm   = ( sent_protocol LWS sent_by ( SEMI ( via_branch |
>> header_param ) )* )
>>                     >start_value %store_value;
>>  Via           = ( "Via"i | "v"i )>write_value>start_field
>> %write_field HCOLON via_parm
>>                     ( COMMA %write_value via_parm )*;
>> 
>> 
>> So I would like to use smething like a C #define. This is, adding at
>> the top of my Ragel file:
>> 
>>   #define COMMA_SEPARATED_VALUES(VALUE) ">write_value>start_field
>>              %write_field HCOLON VALUE ( COMMA %write_value VALUE )*;"
>> 
>> And then in the machine write:
>> 
>>   Via = ( "Via"i | "v"i ) COMMA_SEPARATED_VALUE(via_parm)
>> 
>> 
>> Of course this doesn't work. Is there a way to use "define" macros in
>> Ragel prior to parsing the Ragel grammar? or must I use m4?
>> 
>> Thanks a lot.
>> 
>> 
> 
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