[antlr-interest] (unknown)

[franck_antibes_fr]

Hi,




I am writing a verilog parser based on the grammar found on antlr.org.


but I have to handle in my parser `define macros and `ifdef `else 
`endif compiler directive. ( I do not want to preprocess the file).




for the people that know nothing about verilog, the problem is the 
same as #define and #ifdef #else #endif preprocessor directive in 
C/C++ so I will transpose the problem in C++ instead of verilog.






a litle example








#ifdef CAN_DERIVE


#include "base.h"




class toto : public base {


public: 


   toto(int a):base(a){}


#else 


class toto {


protected:


   int a_;


public: 


   toto(int a):a_(a){}


#endif


   virtual get_a() {return a_;}


};






because #ifdef ... can be everywhere in the code, it is not feasable 


to put everywhere in the grammar rules to handle this. I thought to 
use a king of tokenstream filter or multiplexer with several parsers.




Do any one have an idea to solve this ?




thanks 




Franck









 

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