changing lex rules from yacc

[bvermaut . cs]

        Hi everyone,


        Is it possible to change the lex rules (via the starts) through
yacc.

        I explain:

        Let say, I have:

        toto.lex
        -------

        a {BEGIN AA;return A}}
        b {return B;}
        <AA>[^ab$]* {BEGIN 0; return T;}
        [^abd]* {return T;}

        toto.yacc
        ---------
        %token A B T
        %start message
        %%
        message : expr;
        expr    :       ABT | BT;



        Isn't it possible to change it to something like:
> toto.lex
> -------
> 
> a {return A}}
> b {return B;}
> <AA>[^ab$]* {return T;}
> [^abd]* {return T;}
> 
> toto.yacc
> ---------
> %token A B T
> %start message
> %%
> message : expr;
> expr  :       A{BEGIN AA;}BT{BEGIN 0;} | BT;
> 
> 
????

Thanks

Bertrand



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