Your grammar is ambigious. It can be seen if you make the following transformation, factoring out the null transition of opt_select, and you will see the shift/reduce conflict: %token YYID YYDOT %% identifier : hier_id; hier_id : simple_id | hier_id YYDOT simple_id | hier_id opt_select YYDOT simple_id ; opt_select : '[' expr ']' | opt_select '[' expr ']'; simple_id : YYID ; expr : hier_id | function_call; function_call : expr YYDOT YYID ;
now you see the function_call is the same as the added hier_id YYDOT simple_id hope this helps Henrik On Monday 28 February 2005 21.46, Soumitra Kumar wrote: > %token YYID YYDOT > %% > identifier : hier_id > ; > hier_id : simple_id > | hier_id opt_select YYDOT simple_id > ; > opt_select : > | opt_select '[' expr ']' > ; > > simple_id : YYID ; > expr : hier_id > | function_call > ; > function_call : expr YYDOT YYID > ; _______________________________________________ Help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison
