VariableDecrementNode.cpp

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#ifndef _MADARA_NO_KARL_
#include "madara/expression/Visitor.h"
#include "madara/expression/LeafNode.h"
#include "madara/expression/VariableDecrementNode.h"
#include "madara/utility/Utility.h"
 
#include <string>
#include <sstream>
 
madara::expression::VariableDecrementNode::VariableDecrementNode(
    ComponentNode* lhs, madara::knowledge::KnowledgeRecord value,
    ComponentNode* rhs, madara::knowledge::ThreadSafeContext& context)
  : ComponentNode(context.get_logger()),
    var_(0),
    array_(0),
    value_(value),
    rhs_(rhs)
{
  var_ = dynamic_cast<VariableNode*>(lhs);
 
  if (!var_)
    array_ = dynamic_cast<CompositeArrayReference*>(lhs);
}
 
madara::expression::VariableDecrementNode::~VariableDecrementNode()
{
  // do not clean up record_. Let the context clean that up.
}
 
void madara::expression::VariableDecrementNode::accept(Visitor& visitor) const
{
  visitor.visit(*this);
}
 
madara::knowledge::KnowledgeRecord
madara::expression::VariableDecrementNode::item() const
{
  knowledge::KnowledgeRecord value;
 
  if (var_)
    value = var_->item();
  else if (array_)
    value = array_->item();
 
  return value;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::VariableDecrementNode::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::VariableDecrementNode: "
        "KARL COMPILE ERROR: Variable assignment has no variable\n");
 
    throw exceptions::KarlException(
        "madara::expression::VariableDecrementNode: "
        "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::VariableDecrementNode: "
        "KARL COMPILE ERROR: Variable assignment has no right expression\n");
 
    throw exceptions::KarlException(
        "madara::expression::VariableDecrementNode: "
        "KARL COMPILE ERROR: "
        "Node has no right expression\n");
  }
 
  can_change = left_child_can_change || right_child_can_change;
 
  return right_value;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::VariableDecrementNode::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  madara::knowledge::KnowledgeRecord rhs;
 
  if (rhs_)
    rhs = rhs_->evaluate(settings);
  else
    rhs = value_;
 
  if (var_)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::CompositeAssignmentNode::evaluate: "
        "Attempting to set variable %s to %s.\n",
        var_->expand_key().c_str(), rhs.to_string().c_str());
 
    knowledge::KnowledgeRecord result(var_->evaluate(settings) - rhs);
    var_->set(result, settings);
    return result;
  }
  else if (array_)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::CompositeAssignmentNode::evaluate: "
        "Attempting to set index of var %s to %s.\n",
        array_->expand_key().c_str(), rhs.to_string().c_str());
 
    knowledge::KnowledgeRecord result(array_->evaluate(settings) - rhs);
    array_->set(result, settings);
    return result;
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::CompositeAssignmentNode::evaluate: "
        "left hand side was neither a variable nor an array reference. "
        "Check your expression for errors.\n",
        array_->expand_key().c_str(), rhs.to_string().c_str());
  }
 
  // return the value
  return rhs;
}
 
#endif  // _MADARA_NO_KARL_