using HeuristicLab.Algorithms.PushGP.Interpreter;

namespace HeuristicLab.Algorithms.PushGP.Expressions.Name
{
    public class NameDefineXExecExpression : Expression
    {
        private readonly string name;
        public NameDefineXExecExpression(string name)
        {
            this.name = name;
        }

        public override bool IsCodeOp { get { return false; } }

        public override void Eval(IInterpreter interpreter)
        {
            Expression expression;
            if (interpreter.CustomExpressions.TryGetValue(this.name, out expression))
            {
                interpreter.ExecStack.Push(expression);
            }
            else
            {
                interpreter.NameStack.Push(this.name);
            }
        }

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