WWW DSL using Irony - Part 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Irony.Compiler;
using Irony.Runtime;
using System.Threading;
using Irony.Compiler.AST;

namespace WWWDSL
{
    public class PostDataItemNode : AstNode
    {
        private AstNode paramNode_;
        private AstNode valueNode_;

        public PostDataItemNode(NodeArgs args, AstNode paramNode, AstNode valueNode)
            : base(args)
        {
            ChildNodes.Clear();

            paramNode_ = paramNode;
            if (paramNode_ is VarRefNode)
            {
                paramNode_.Flags |= AstNodeFlags.AllocateSlot | AstNodeFlags.NotRValue;
            }
            AddChild("param", paramNode_);

            valueNode_ = valueNode;
            if (valueNode_ is VarRefNode)
            {
                valueNode_.Flags |= AstNodeFlags.AllocateSlot | AstNodeFlags.NotRValue;
            }
            AddChild("value", valueNode_);
        }

        protected override void DoEvaluate(EvaluationContext context)
        {
            paramNode_.Evaluate(context);
            string left = (string)context.CurrentResult;
            valueNode_.Evaluate(context);
            string right = (string)context.CurrentResult;
            context.CurrentResult = left + "=" + right;
        }
    }
}