source: branches/PushGP/HeuristicLab.PushGP/HeuristicLab.Problems.ProgramSynthesis/Push/Expressions/RandExpressions.cs @ 14952

namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Attributes;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Generators.CodeGenerator;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Interpreter;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Stack;

  /// <summary>
  ///     Pushes a random NAME.
  /// </summary>
  [PushExpression(StackTypes.Name, "NAME.RAND")]
  [StorableClass]
  public class NameRandExpression : StatelessExpression {
    public NameRandExpression() { }
    [StorableConstructor]
    protected NameRandExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return !interpreter.Configuration.ErcOptions.NameErcOptions.IsEnabled;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var name = interpreter.Configuration.ErcOptions.NameErcOptions.GetErcValue(interpreter.Random);
      interpreter.NameStack.Push(name);
    }
  }

  /// <summary>
  ///     Pushes a random integer.
  /// </summary>
  [PushExpression(StackTypes.Integer, "INTEGER.RAND")]
  [StorableClass]
  public class IntegerRandExpression : StatelessExpression {
    public IntegerRandExpression() { }
    [StorableConstructor]
    protected IntegerRandExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return !interpreter.Configuration.ErcOptions.IntegerErcOptions.IsEnabled;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.Configuration.ErcOptions.IntegerErcOptions.GetErcValue(interpreter.Random);
      interpreter.IntegerStack.Push(value);
    }
  }

  /// <summary>
  ///     Pushes a random float.
  /// </summary>
  [PushExpression(StackTypes.Float, "FLOAT.RAND")]
  [StorableClass]
  public class FloatRandExpression : StatelessExpression {
    public FloatRandExpression() { }
    [StorableConstructor]
    protected FloatRandExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return !interpreter.Configuration.ErcOptions.FloatErcOptions.IsEnabled;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.Configuration.ErcOptions.FloatErcOptions.GetErcValue(interpreter.Random);
      interpreter.FloatStack.Push(value);
    }
  }

  /// <summary>
  ///     Pushes a random boolean.
  /// </summary>
  [PushExpression(StackTypes.Boolean, "BOOLEAN.RAND")]
  [StorableClass]
  public class BooleanRandExpression : StatelessExpression {
    public BooleanRandExpression() { }
    [StorableConstructor]
    protected BooleanRandExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return !interpreter.Configuration.ErcOptions.BooleanErcOptions.IsEnabled;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var value = interpreter.Configuration.ErcOptions.BooleanErcOptions.GetErcValue(interpreter.Random);
      interpreter.BooleanStack.Push(value);
    }
  }

  /// <summary>
  ///     Pushes random expressions onto the code stack.
  /// </summary>
  [PushExpression(StackTypes.Code, "CODE.RAND")]
  [StorableClass]
  public class CodeRandExpression : StatelessExpression {
    public CodeRandExpression() { }
    [StorableConstructor]
    protected CodeRandExpression(bool deserializing) : base(deserializing) { }

    public override bool IsNoop(IInternalPushInterpreter interpreter) {
      return interpreter.IntegerStack.Count == 0 || interpreter.IntegerStack.Top < 1;
    }

    public override void Eval(IInternalPushInterpreter interpreter) {
      var size = (int)(interpreter.IntegerStack.Pop() % interpreter.Configuration.MaxPointsInRandomExpression);
      var program = LinearCodeGenerator.RandomProgram(
        interpreter.PoolContainer.PushProgramPool,
        interpreter.PoolContainer.ExpressionListPool,
        size,
        interpreter.Random,
        interpreter.Configuration,
        interpreter.CustomExpressions);

      interpreter.CodeStack.Push(program);
    }
  }
}