CompositeNegateNode.cpp

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/* -*- C++ -*- */
#ifndef _NEGATE_NODE_CPP_
#define _NEGATE_NODE_CPP_
 
#ifndef _MADARA_NO_KARL_
 
#include <iostream>
 
#include "madara/expression/ComponentNode.h"
#include "madara/expression/CompositeUnaryNode.h"
#include "madara/expression/Visitor.h"
#include "madara/expression/CompositeNegateNode.h"
#include "madara/expression/LeafNode.h"
 
madara::expression::CompositeNegateNode::CompositeNegateNode(
    logger::Logger& logger, ComponentNode* right)
  : CompositeUnaryNode(logger, right)
{
}
 
// Dtor
madara::expression::CompositeNegateNode::~CompositeNegateNode(void) {}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeNegateNode::item(void) const
{
  return knowledge::KnowledgeRecord("-");
}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeNegateNode::prune(bool& can_change)
{
  bool right_child_can_change = false;
  madara::knowledge::KnowledgeRecord right_value;
 
  if (this->right_)
  {
    right_value = this->right_->prune(right_child_can_change);
    if (!right_child_can_change && dynamic_cast<LeafNode*>(right_) == 0)
    {
      delete this->right_;
      this->right_ = new LeafNode(*(this->logger_), right_value);
    }
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::CompositeNegateNode: "
        "KARL COMPILE ERROR: "
        "Negate has no right expression\n");
 
    throw exceptions::KarlException("madara::expression::CompositeNegateNode: "
                                    "KARL COMPILE ERROR: "
                                    "Negate has no right expression\n");
  }
 
  can_change = right_child_can_change;
 
  return -right_value;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeNegateNode::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  madara::knowledge::KnowledgeRecord value = right_->evaluate(settings);
 
  madara_logger_ptr_log(logger_, logger::LOG_DETAILED,
      "madara::expression::CompositeNegateNode:: Negating %s.\n",
      value.to_string().c_str());
 
  return -value;
}
 
// accept a visitor
void madara::expression::CompositeNegateNode::accept(Visitor& visitor) const
{
  visitor.visit(*this);
}
 
#endif  // _MADARA_NO_KARL_
 
#endif /* _NEGATE_NODE_CPP_ */