public IfStatement(ArithmExprEvaluator e1, RelationEvalutator relOp, ArithmExprEvaluator e2, Queue <Statement> stat, Queue <Statement> elseStat)
 {
     expr1          = e1;
     relationOp     = relOp;
     expr2          = e2;
     statements     = stat;
     elseStatements = elseStat;
 }
 private Statement HandleIfStatement()
 {
     if (Accept(TokenType.If))
     {
         Expect(TokenType.ParenthesisLeft);
         var expr1         = GetArithmExpr();
         var relationToken = currentToken;
         ExpectRelationOp();
         var relationOp = new RelationEvalutator(relationToken.code);
         var expr2      = GetArithmExpr();
         Expect(TokenType.ParenthesisRight);
         var blockStatements     = GetStatementBlock();
         var elseBlockStatements = new Queue <Statement>();
         if (Accept(TokenType.Else))
         {
             elseBlockStatements = GetStatementBlock();
         }
         return(new IfStatement(expr1, relationOp, expr2, blockStatements, elseBlockStatements));
     }
     return(null);
 }