[antlr-interest] Custom AST Node

[Henry Butowsky]

Hi Guys, 
 I using  Antlr 2.7.5-6   and the cpp runtime.
 I wanted to add line number to my tree parsing error messages so I
created my own AST node called ncoAST ( following the C++ notes in
http://www.antlr.org/doc/cpp-runtime.html#_bb1 )

I have a tree parsing function  called "statements" --this calls other
tree parsing including "out" which is my c like expression evaluator
However in order to get the program to compile I have had to add 
casts where the AST nodes refer to a child or sibling e.g

       run((RefncoAST)(blk->getFirstChild()));
      var=out((RefncoAST)(exp->getFirstChild()));

I would like to sort out ncoAST so I don't have to add casts as code
like above is doted throughout my tree parser -- Im no expert in C++
Pleae help

Many thx 

Regards Henry

  

statements 
{
var_sct *var;

}
    : blk:BLOCK { 
       run((RefncoAST)(blk->getFirstChild()));
            
                }

    | exp:EXPR {
        
      if(exp->getFirstChild()->getType() == ASSIGN)
 	    cout << "Type ASSIGN " <<
exp->getFirstChild()->getFirstChild()->getText() <<endl;
      var=out((RefncoAST)(exp->getFirstChild()));
      var=nco_var_free(var);

      }
              

    | iff:IF {
      bool br;
      var_sct *var1;
      RefncoAST ex;      
	  //Calculate logical expression
	  var1= out( iff->getFirstChild());
	  br=ncap_var_lgcl(var1);
	  var1=nco_var_free(var1);

      if(br) { 
         run(iff->getFirstChild()->getNextSibling() );    
	     }else{ 
           // See if else exists 
         ex=iff->getFirstChild()->getNextSibling()->getNextSibling(); 
         if(ex && ex->getType()==ELSE ) run(ex->getFirstChild());
       }
 
      var=(var_sct*)NULL;
      
      }


    | ELSE {

      }
    
    | def:DEFDIM {
            
        const char *dmn_nm;
        long sz;
            
        dmn_nm=def->getFirstChild()->getText().c_str();
            
        var=out(def->getFirstChild()->getNextSibling());    
        var=nco_var_cnf_typ(NC_INT,var);

        (void)cast_void_nctype(NC_INT,&var->val);
        sz=*var->val.lp;
        var=(var_sct*)nco_var_free(var);
        (void)ncap_def_dim(dmn_nm,sz,prs_arg);
     }
             

    | NULL_NODE {
            }
    ;