Calling a parser from a parser

[Antoine Fink]

Hi,

Is it possible with Bison/Yacc to parse a language using 2 parsers for 
different sections ?

Example :
I have this language :
----------------------
LG[0] {
0 : abc : 1, 2;
1 : bcd : 3, 4, 5;
2 : x   : 3;
3 : abc : 3, 4;
BB[x] {
  a -> 1,2;
  b -> 2,4;
  c -> 3;
  d -> ;
  x -> 1,2,3,4,5;
}
4 : bc  : 5;
5 : abc : 1,4,5;
};
----------------------

I would like to have lg_parser.y / lg_lexer.lex to parse all the lines 
including colons (":") and use bb_parser.y / bb_parser.lex to parse all 
the lines including arrows ("->").

How can I invoke yyparse from bb_parser when alreading in the middle of 
parsing the same file with lb_parser, and then return to lb_parser to 
read the remaining lines ? Say, the top level parsing function would 
read "LG", and invoke lg_parser, and when lg_parser reads "BB", it would 
have the following lines parsed by bb_parser up to next closing braket, 
and return to lg_parser to parse the rest.

I've been playing around for a while, reading doc, and I can't figure if 
this is even possible...


help anyone ?
thank you much !
--
antoine fink
software designer
IDT Canada LTD
address@hidden