Parser - expressions


Another example...

primary_expr
                            /* do symboltable lookup */
   : identifier      {  $$ = newast_val(symval($1)); }
                           /* add to AST as 'value' */
   | CONSTANT        {  $$ = newast_val($1); }
   | string_literal  
   | '(' expr ')'    {  $$ = $2; }   /* strip parenthesis... */
   ;
         
string_literal /* string passed from scanner */
                                /* add string to ast as value */
    : STRING_LITERAL                    { $$ = newast_val($1); }
    ;