SystemCallPow.cpp

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#ifndef _MADARA_NO_KARL_
 
#include <math.h>
 
#include "madara/expression/LeafNode.h"
#include "madara/expression/SystemCallPow.h"
#include "madara/knowledge/ThreadSafeContext.h"
#include "madara/expression/Visitor.h"
 
madara::expression::SystemCallPow::SystemCallPow(
    madara::knowledge::ThreadSafeContext& context, const ComponentNodes& nodes)
  : SystemCallNode(context, nodes)
{
}
 
// Dtor
madara::expression::SystemCallPow::~SystemCallPow(void) {}
 
madara::knowledge::KnowledgeRecord madara::expression::SystemCallPow::item(
    void) const
{
  return madara::knowledge::KnowledgeRecord(nodes_.size());
}
 
madara::knowledge::KnowledgeRecord madara::expression::SystemCallPow::prune(
    bool& can_change)
{
  madara::knowledge::KnowledgeRecord result;
 
  if (nodes_.size() == 2)
  {
    bool base_can_change = false, power_can_change = false;
 
    double base = nodes_[0]->prune(base_can_change).to_double();
    double power = nodes_[1]->prune(power_can_change).to_double();
 
    if (!base_can_change && dynamic_cast<LeafNode*>(nodes_[0]) == 0)
    {
      delete nodes_[0];
      nodes_[0] = new LeafNode(*(this->logger_), base);
    }
 
    if (!power_can_change && dynamic_cast<LeafNode*>(nodes_[1]) == 0)
    {
      delete nodes_[1];
      nodes_[1] = new LeafNode(*(this->logger_), power);
    }
 
    result = knowledge::KnowledgeRecord(pow(base, power));
 
    can_change = can_change || base_can_change || power_can_change;
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::SystemCallPow: "
        "KARL COMPILE ERROR:"
        "System call pow requires 2 arguments,"
        "e.g., #pow (4,2), which would return 16.\n");
 
    throw exceptions::KarlException(
        "madara::expression::SystemCallPow: "
        "KARL COMPILE ERROR: "
        "System call pow requires 2 arguments,"
        "e.g., #pow (4,2), which would return 16.\n");
  }
 
  return result;
}
 
madara::knowledge::KnowledgeRecord madara::expression::SystemCallPow::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  knowledge::KnowledgeRecord return_value;
 
  if (nodes_.size() == 2)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::SystemCallPow: "
        "System call pow is returning the base taken to the power\n");
 
    return_value = knowledge::KnowledgeRecord(
        pow(nodes_[0]->evaluate(settings).to_double(),
            nodes_[1]->evaluate(settings).to_double()));
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::SystemCallPow: "
        "KARL RUNTIME ERROR:"
        "System call pow requires 2 arguments,"
        "e.g., #pow (4,2), which would return 16.\n");
 
    throw exceptions::KarlException(
        "madara::expression::SystemCallPow: "
        "KARL RUNTIME ERROR: "
        "System call pow requires 2 arguments,"
        "e.g., #pow (4,2), which would return 16.\n");
  }
 
  return return_value;
}
 
// accept a visitor
void madara::expression::SystemCallPow::accept(
    madara::expression::Visitor& visitor) const
{
  visitor.visit(*this);
}
 
#endif  // _MADARA_NO_KARL_