source: branches/PushGP/HeuristicLab.Algorithms.PushGP/HeuristicLab.Algorithms.PushGP/Expressions/StackdepthExpressions.cs @ 14513

namespace HeuristicLab.Algorithms.PushGP.Expressions {
  using HeuristicLab.Algorithms.PushGP.Interpreter;
  using HeuristicLab.Algorithms.PushGP.Stack;

  /// <summary>
  ///     Pushes the stack depth onto the INTEGER stack (thereby increasing it!).
  /// </summary>
  /// <typeparam name="T">Stacktype</typeparam>
  public abstract class StackdepthExpression<T> : StatelessExpression {
    public void Eval(IStack<T> stack, IStack<long> integerStack, bool incremental = false) {
      var count = stack.Count;

      if (incremental) count += 1;

      integerStack.Push(count);
    }
  }

  public class IntegerStackdepthExpression : StackdepthExpression<long> {
    protected override string InitStringRepresentation() {
      return "INTEGER.STACKDEPTH";
    }

    public override void Eval(IPushGpInterpreter interpreter) {
      this.Eval(interpreter.IntegerStack, interpreter.IntegerStack, true);
    }
  }

  public class FloatStackdepthExpression : StackdepthExpression<double> {
    protected override string InitStringRepresentation() {
      return "FLOAT.STACKDEPTH";
    }

    public override void Eval(IPushGpInterpreter interpreter) {
      this.Eval(interpreter.FloatStack, interpreter.IntegerStack);
    }
  }

  public class BooleanStackdepthExpression : StackdepthExpression<bool> {
    protected override string InitStringRepresentation() {
      return "BOOLEAN.STACKDEPTH";
    }

    public override void Eval(IPushGpInterpreter interpreter) {
      this.Eval(interpreter.BooleanStack, interpreter.IntegerStack);
    }
  }

  public class NameStackdepthExpression : StackdepthExpression<string> {
    protected override string InitStringRepresentation() {
      return "NAME.STACKDEPTH";
    }

    public override void Eval(IPushGpInterpreter interpreter) {
      this.Eval(interpreter.NameStack, interpreter.IntegerStack);
    }
  }

  public class ExecStackdepthExpression : StackdepthExpression<Expression> {
    protected override string InitStringRepresentation() {
      return "EXEC.STACKDEPTH";
    }

    public override void Eval(IPushGpInterpreter interpreter) {
      this.Eval(interpreter.ExecStack, interpreter.IntegerStack);
    }
  }

  public class CodeStackdepthExpression : StackdepthExpression<Expression> {
    protected override string InitStringRepresentation() {
      return "CODE.STACKDEPTH";
    }

    public override void Eval(IPushGpInterpreter interpreter) {
      this.Eval(interpreter.CodeStack, interpreter.IntegerStack);
    }
  }
}