help with an if rule!

[Roberto Mandall]

hi there, i have these rules for a pascal comp:

open_if_statement : IF boolean_expression THEN  statement
           |IF boolean_expression THEN closed_statement ELSE 
open_statement;

closed_if_statement : IF boolean_expression THEN closed_statement ELSE 
closed_statement;

i want to add some semantic actions after the then ,but i get conflicts, 
which is pretty understable, as what i would like to do is this.
open_if_statement : IF boolean_expression THEN {} statement
           |IF boolean_expression THEN {}closed_statement ELSE 
open_statement;

closed_if_statement : IF boolean_expression THEN {}closed_statement ELSE 
closed_statement;

can anyone tell me how could i add some rules there? i have tried this:
open_if_statement : IF boolean_expression {sifthen($2);}THEN  statement;
open_if_else_statement: IF boolean_expression {sifthen($2);}THEN 
closed_statement ELSE open_statement;
and this
open_if_statement : IF boolean_expression THEN cosa  statement;
cosa:{sifthen($2);} I know cosa will fail with the $2, but what i want 
to know i swhat else could i do so i do not get a conflict.


thank u in advance!


        
        
                
______________________________________________ 
Renovamos el Correo Yahoo! 
Nuevos servicios, más seguridad 
http://correo.yahoo.es