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_ERROR,
        "madara::expression::SystemCallRandDouble: "
        "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");
 
    throw exceptions::KarlException(
        "madara::expression::SystemCallRandDouble: "
        "KARL COMPILE ERROR: "
        "System call rand_double"
        " can have up to three arguments, 1) floor, "
        "2) ceiling and 3) whether to set the random seeds\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 = nodes_[2]->evaluate(settings).to_integer() != 0;
      }
    }
  }
 
  madara_logger_ptr_log(logger_, logger::LOG_MINOR,
      "madara::expression::SystemCallRandDouble: "
      "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_