Re: help with an if rule!

[Roberto Mandall]

thx for the answer,but i still get errors, i guess i just do not 
undertsnad bison well enough.
i have this now:
%nonassoc ELSE
%nonassoc THEN

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 get this:
bison -d --debug -v parser.y
parser.y: conflicts: 1 reduce/reduce

parser out put says:
State 140 conflicts: 1 reduce/reduce

state 140 has got this:

state 140

  38 statement: closed_statement .
  54 open_if_statement: IF boolean_expression THEN closed_statement . 
@13 ELSE open_statement
  56 closed_if_statement: IF boolean_expression THEN closed_statement . 
@14 ELSE closed_statement

   ELSE      reduce using rule 53 (@13)
   ELSE      [reduce using rule 55 (@14)]
   $default  reduce using rule 38 (statement)

   @13  go to state 162
   @14  go to state 163

can any1 plz tell me what am i doing wrong? i do really need those 
semantic rules after the "THEN closed_statement"

Hans Aberg escribió:

> On 14 Aug 2005, at 18:53, Roberto Mandall wrote:
>
> > 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,
>
>
> You can use token precedences (like %nonassoc) on "ELSE" and "THEN".
>
>   Hans Aberg

                
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