[ragel-users] getNextToken() : how to return ?

Maël Nison nison.mael at gmail.com
Thu Jan 5 15:20:57 UTC 2012

Epic formatting fail. I hope it will be better this time. Sorry ..


I would like to write a very basic function taking a c++ char const *
&, and returning the first token type.
The reference would imply that the cstring pointer's target is, after
the function call, the very next character of the returned token.

Then I would be able to make :
while ( token = getNextToken( foo ) )
  std::cout << token << std::endl;

I've tried to use something like that (example, probably does not
compile),  but the value of 'p' is not modified when returning
(infinite loop) :

#include "Token.hh"
%%machine foo;
%%write data;

int getNextToken( char const * & p ) {
    foo = "foo";
    main := |* foo => { return Foo; }; *|;

  int cs;
  int act;
  char const * ts;
  char const * te;
  char const * eof;

  %% write init;
  %% write exec noend;

Additionally, I've seen in the documentation that getkey could be
employed to change the buffer input. Is there an example using
standard c++ istreams ?

Maël Nison
Epitech 2014, Paris - Astek
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