CompositeOrNode.cpp

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/* -*- C++ -*- */
 
#ifndef COMPOSITE_OR_NODE_CPP
#define COMPOSITE_OR_NODE_CPP
 
#ifndef _MADARA_NO_KARL_
 
#include <iostream>
 
#include "madara/expression/ComponentNode.h"
#include "madara/expression/Visitor.h"
#include "madara/expression/CompositeOrNode.h"
#include "madara/expression/LeafNode.h"
 
madara::expression::CompositeOrNode::CompositeOrNode(
    logger::Logger& logger, const ComponentNodes& nodes)
  : madara::expression::CompositeTernaryNode(logger, nodes)
{
}
 
madara::knowledge::KnowledgeRecord madara::expression::CompositeOrNode::item(
    void) const
{
  return knowledge::KnowledgeRecord("||");
}
 
madara::knowledge::KnowledgeRecord madara::expression::CompositeOrNode::prune(
    bool& can_change)
{
  madara::knowledge::KnowledgeRecord return_value;
 
  int j = 0;
  for (ComponentNodes::iterator i = nodes_.begin(); i != nodes_.end(); ++i, ++j)
  {
    bool value_changes = false;
    madara::knowledge::KnowledgeRecord value;
    value = (*i)->prune(value_changes);
    if (!value_changes && dynamic_cast<LeafNode*>(*i) == 0)
    {
      delete *i;
      *i = new LeafNode(*(this->logger_), value);
    }
 
    if (j == 0)
      return_value = value;
    else
      return_value = knowledge::KnowledgeRecord(value || return_value);
 
    can_change = can_change || value_changes;
  }
 
  if (nodes_.size() < 2)
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "CompositeOrNode: "
        "KARL COMPILE ERROR (||): "
        "Or should have a left and right-hand side argument.\n");
 
    throw exceptions::KarlException(
        "CompositeOrNode: "
        "KARL COMPILE ERROR (||): "
        "Or should have a left and right-hand side argument.\n");
  }
 
  return return_value;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeOrNode::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  int j = 0;
  for (ComponentNodes::iterator i = nodes_.begin(); i != nodes_.end(); ++i, ++j)
  {
    // if we have a non-zero eval, return 1 immediately
    if ((*i)->evaluate(settings).is_true())
      return madara::knowledge::KnowledgeRecord(1);
  }
 
  // if nothing was true, return false
  return madara::knowledge::KnowledgeRecord();
}
 
// accept a visitor
void madara::expression::CompositeOrNode::accept(Visitor& visitor) const
{
  visitor.visit(*this);
}
 
#endif  // _MADARA_NO_KARL_
 
#endif /* COMPOSITE_OR_NODE_CPP */