WEP_V2.1.3/SourceCode/We.Engine/WeEngine.Runtime/Functions/CheckCondition.cs

using IwbZero.Expr;
using IwbZero.ToolCommon.StringModel;

namespace WeEngine.Functions
{
    public class CheckCondition : RunTimeBase,IFunction
    {
        public string Invoke(ExprObject exprObj)
        {
            var child = exprObj.GetChild(0);
            GetPackage(child.Expr);
            //Rp.StartPackage();
            var child2 = exprObj.GetChild(2);
            var node = Rp.GetNodeByPath(child2?.Expr);
            if (node == null)
            {
                return "FALSE";
            }

            var child3 = exprObj.GetChild(4);
            if (child3!=null)
            {
                if (child3.ElementType == ExprElements.Value)
                {
                    return child3.Expr.ValB().ToString().UAndT();
                }
                return ExprModule.Evaluate(child3.Expr);
            }
            return "TRUE";
        }
    }
}