oldstuff

Program: StmtBlock { top = $$ = $1; }

Exprq: { $$ = nullptr; }
    | Expr
Expr: T_Identifier { $$ = new ParseTree("IDENTIFIER"); }

Stmt: Exprq T_Semicolon { $$ = $1 ? $1 : new ParseTree("NULLSTMT"); }
Stmts: { $$ = new ParseTree("STATEMENTS"); }
    | Stmts Stmt { $1->addChild($2);
                   $$ = $1; }
StmtBlock: T_LBrace Stmts T_RBrace { $$ = new ParseTree("STATEMENTBLOCK", $2); }

/* S: Expr { top = $$ = $1; }
Expr: Expr Op1 Term { $$ = new ParseTree("BINOP", $1, $2, $3); }
   |  Term            { $$ = $1; }

Term: Term Op2 Factor { $$ = new ParseTree("BINOP", $1, $2, $3); }
   |  Factor          { $$ = $1; }

Factor:  Y_Identifier           { $$ = $1; }
    |    T_LParen Expr T_RParen { $$ = $2; }

Op1: T_Plus { $$ = new ParseTree(myTok); }
  |  T_Minus { $$ = new ParseTree(myTok); }


Op2: T_Times { $$ = new ParseTree(myTok); }
  |  T_Div { $$ = new ParseTree(myTok); }