VariableCompareNode.cpp

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#ifndef _MADARA_NO_KARL_
#include "madara/expression/Visitor.h"
#include "madara/expression/LeafNode.h"
#include "madara/expression/VariableCompareNode.h"
#include "madara/utility/Utility.h"
 
typedef madara::knowledge::KnowledgeRecord KnowledgeRecord;
 
#include <string>
#include <sstream>
 
madara::expression::VariableCompareNode::VariableCompareNode(ComponentNode* lhs,
    madara::knowledge::KnowledgeRecord value, int compare_type,
    ComponentNode* rhs, madara::knowledge::ThreadSafeContext& context)
  : ComponentNode(context.get_logger()),
    var_(0),
    array_(0),
    value_(value),
    rhs_(rhs),
    context_(context),
    compare_type_(compare_type)
{
  var_ = dynamic_cast<VariableNode*>(lhs);
 
  if (!var_)
    array_ = dynamic_cast<CompositeArrayReference*>(lhs);
}
 
madara::expression::VariableCompareNode::~VariableCompareNode()
{
  // do not clean up record_. Let the context clean that up.
}
 
void madara::expression::VariableCompareNode::accept(Visitor& visitor) const
{
  visitor.visit(*this);
}
 
KnowledgeRecord madara::expression::VariableCompareNode::item() const
{
  knowledge::KnowledgeRecord value;
 
  if (var_)
    value = var_->item();
  else if (array_)
    value = array_->item();
 
  return value;
}
 
KnowledgeRecord madara::expression::VariableCompareNode::prune(bool& can_change)
{
  bool left_child_can_change = false;
  bool right_child_can_change = false;
  madara::knowledge::KnowledgeRecord right_value;
 
  if (this->var_ != 0 || this->array_ != 0)
    left_child_can_change = true;
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::VariableCompareNode: "
        "KARL COMPILE ERROR: Compare has no variable\\n");
 
    throw exceptions::KarlException("madara::expression::VariableCompareNode: "
                                    "KARL COMPILE ERROR: "
                                    "Node has no variable left-hand side\n");
  }
 
  if (this->rhs_)
  {
    right_value = this->rhs_->prune(right_child_can_change);
    if (!right_child_can_change && dynamic_cast<LeafNode*>(rhs_) == 0)
    {
      delete this->rhs_;
      this->rhs_ = new LeafNode(*(this->logger_), right_value);
    }
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::VariableCompareNode: "
        "KARL COMPILE ERROR: Compare has no right expression\n");
 
    throw exceptions::KarlException("madara::expression::VariableCompareNode: "
                                    "KARL COMPILE ERROR: "
                                    "Node has no right expression\n");
  }
 
  can_change = left_child_can_change || right_child_can_change;
 
  return right_value;
}
 
KnowledgeRecord madara::expression::VariableCompareNode::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  KnowledgeRecord lhs;
  KnowledgeRecord::Integer result(0);
 
  if (var_)
    lhs = var_->evaluate(settings);
  else if (array_)
    lhs = array_->evaluate(settings);
 
  if (rhs_)
  {
    if (compare_type_ == LESS_THAN)
    {
      result = lhs < rhs_->evaluate(settings);
    }
    else if (compare_type_ == LESS_THAN_EQUAL)
    {
      result = lhs <= rhs_->evaluate(settings);
    }
    else if (compare_type_ == EQUAL)
    {
      result = lhs == rhs_->evaluate(settings);
    }
    else if (compare_type_ == GREATER_THAN_EQUAL)
    {
      result = lhs >= rhs_->evaluate(settings);
    }
    else
    {
      result = lhs > rhs_->evaluate(settings);
    }
  }
  else
  {
    if (compare_type_ == LESS_THAN)
    {
      result = lhs < value_;
    }
    else if (compare_type_ == LESS_THAN_EQUAL)
    {
      result = lhs <= value_;
    }
    else if (compare_type_ == EQUAL)
    {
      result = lhs == value_;
    }
    else if (compare_type_ == GREATER_THAN_EQUAL)
    {
      result = lhs >= value_;
    }
    else
    {
      result = lhs > value_;
    }
  }
 
  return knowledge::KnowledgeRecord(result);
}
 
#endif  // _MADARA_NO_KARL_