using HeuristicLab.Algorithms.PushGP.Stack;

namespace HeuristicLab.Algorithms.PushGP.Expressions
{
    public class NameDefineXExecExpression : Expression
    {
        public NameDefineXExecExpression(string value) : base(OpCode.NameDefineXExec)
        {
            this.Value = value;
        }

        public string Value { get; }

        public override void Eval(IInterpreterService interpreterService)
        {
            Expression expression;
            if (interpreterService.CustomExpressions.TryGetValue(this.Value, out expression))
            {
                interpreterService.ExecStack.Push(expression);
            }
            else
            {
                interpreterService.NameStack.Push(this.Value);
            }
        }

        public override string ToString()
        {
            return this.Value;
        }
    }
}