SystemCallRandDouble.cpp

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#ifndef _MADARA_NO_KARL_


#include "madara/utility/Utility.h"
#include "madara/expression/LeafNode.h"
#include "madara/expression/SystemCallRandDouble.h"
#include "madara/knowledge/ThreadSafeContext.h"
#include "madara/expression/Visitor.h"


madara::expression::SystemCallRandDouble::SystemCallRandDouble (
  madara::knowledge::ThreadSafeContext & context,
  const ComponentNodes & nodes)
  : SystemCallNode (context, nodes)
{

}

// Dtor
madara::expression::SystemCallRandDouble::~SystemCallRandDouble (void)
{
}

madara::knowledge::KnowledgeRecord
madara::expression::SystemCallRandDouble::item (void) const
{
  return madara::knowledge::KnowledgeRecord (nodes_.size ());
}

madara::knowledge::KnowledgeRecord
madara::expression::SystemCallRandDouble::prune (bool & can_change)
{
  can_change = true;
  
  madara::knowledge::KnowledgeRecord result;
  
  for (ComponentNodes::iterator i = nodes_.begin (); i != nodes_.end ();
       ++i)
  {
    bool arg_can_change = false;
    result = (*i)->prune (arg_can_change);
    
    if (!arg_can_change && dynamic_cast <LeafNode *> (*i) == 0)
    {
      delete *i;
      *i = new LeafNode (*(this->logger_), result);
    }
  }

  if (nodes_.size () > 3)
  {
    madara_logger_ptr_log (logger_, logger::LOG_EMERGENCY,
      "KARL COMPILE ERROR: System call rand_double"
      " can have up to three arguments, 1) floor, "
      "2) ceiling and 3) whether to set the random seed\n");
  }

  return result;
}

madara::knowledge::KnowledgeRecord 
madara::expression::SystemCallRandDouble::evaluate (
const madara::knowledge::KnowledgeUpdateSettings & settings)
{
  double floor (0.0), ceiling (1.0);
  bool update_srand = true;
  
  if (nodes_.size () > 0)
  {
    floor = nodes_[0]->evaluate (settings).to_double ();

    if (nodes_.size () > 1)
    {
      ceiling = nodes_[1]->evaluate (settings).to_double ();

      if (nodes_.size () > 2)
      {
        update_srand = bool (nodes_[2]->evaluate (settings).to_integer ());
      }
    }
  }

  madara_logger_ptr_log (logger_, logger::LOG_MINOR,
    "System call rand_double called with %f, %f, %d\n",
    floor, ceiling, update_srand);

  return knowledge::KnowledgeRecord (
      utility::rand_double (floor, ceiling, update_srand));
}

// accept a visitor
void 
madara::expression::SystemCallRandDouble::accept (
  madara::expression::Visitor &visitor) const
{
  visitor.visit (*this);
}

#endif // _MADARA_NO_KARL_