namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
  using System;
  using System.Collections.Generic;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Data.Pool;

  using Interpreter;

  [Serializable]
  public abstract class Expression : IPooledObject {
    public bool IsProgram { get { return GetType() == typeof(PushProgram); } }

    public static readonly IReadOnlyCollection<Expression> EmptyContainer = new Expression[0];

    public virtual string StringRepresentation
    {
      get
      {
        return ExpressionTable.TypeToAttributeTable[GetType()].ExpressionName;
      }
    }

    //public abstract bool IsNoop(IInternalPushInterpreter interpreter);

    public abstract bool Eval(IInternalPushInterpreter interpreter);

    public override string ToString() {
      return StringRepresentation;
    }

    void IPooledObject.Reset() { }
  }
}