CompositeAssignmentNode.cpp

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/* -*- C++ -*- */
 
#ifndef _ASSIGNMENT_NODE_CPP_
#define _ASSIGNMENT_NODE_CPP_
 
#ifndef _MADARA_NO_KARL_
 
#include <iostream>
 
#include "madara/expression/ComponentNode.h"
#include "madara/expression/Visitor.h"
#include "madara/expression/CompositeAssignmentNode.h"
#include "madara/expression/LeafNode.h"
 
// Ctor
 
madara::expression::CompositeAssignmentNode::CompositeAssignmentNode(
    logger::Logger& logger, ComponentNode* left, ComponentNode* right)
  : CompositeUnaryNode(logger, right)
{
  var_ = dynamic_cast<VariableNode*>(left);
 
  if (!var_)
    array_ = dynamic_cast<CompositeArrayReference*>(left);
}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeAssignmentNode::item(void) const
{
  return knowledge::KnowledgeRecord("=");
}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeAssignmentNode::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,
        "CompositeAssignmentNode: "
        "KARL COMPILE ERROR (=): "
        "Assignments must have a variable left hand side.\n");
 
    throw exceptions::KarlException(
        "CompositeAssignmentNode: "
        "KARL COMPILE ERROR (=): "
        "Assignments must have a variable left hand side");
  }
 
  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
  {
    // we should never be able to get here but whatever
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "CompositeAssignmentNode: KARL COMPILE ERROR: "
        "Assignment has no right expression\n");
 
    throw exceptions::KarlException(
        "CompositeAssignmentNode: KARL COMPILE ERROR: "
        "Assignment has no right expression\n");
  }
 
  can_change = left_child_can_change || right_child_can_change;
 
  return right_value;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::CompositeAssignmentNode::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  madara::knowledge::KnowledgeRecord rhs = right_->evaluate(settings);
 
  // get the value from the right side and set the variable's value with it
  // madara::knowledge::KnowledgeRecord value = right_->evaluate ();
  if (var_)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "CompositeAssignmentNode::evaluate: "
        "Attempting to set variable %s to %s.\n",
        var_->expand_key().c_str(), rhs.to_string().c_str());
 
    var_->set(rhs, settings);
  }
  else if (array_)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "CompositeAssignmentNode::evaluate: "
        "Attempting to set index of var %s to %s.\n",
        array_->expand_key().c_str(), rhs.to_string().c_str());
 
    array_->set(rhs, settings);
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "left hand side was neither a variable nor an array reference. "
        "Check your expression for errors.\n");
  }
 
  // return the value
  return rhs;
}
 
// accept a visitor
void madara::expression::CompositeAssignmentNode::accept(Visitor& visitor) const
{
  visitor.visit(*this);
}
 
#endif  // _MADARA_NO_KARL_
 
#endif /* _ASSIGNMENT_NODE_CPP_ */