SystemCallSetClock.cpp

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#ifndef _MADARA_NO_KARL_
 
#include "madara/expression/LeafNode.h"
#include "madara/expression/VariableNode.h"
#include "madara/expression/SystemCallSetClock.h"
#include "madara/knowledge/ThreadSafeContext.h"
#include "madara/expression/Visitor.h"
 
madara::expression::SystemCallSetClock::SystemCallSetClock(
    madara::knowledge::ThreadSafeContext& context, const ComponentNodes& nodes)
  : SystemCallNode(context, nodes)
{
}
 
// Dtor
madara::expression::SystemCallSetClock::~SystemCallSetClock(void) {}
 
madara::knowledge::KnowledgeRecord madara::expression::SystemCallSetClock::item(
    void) const
{
  return madara::knowledge::KnowledgeRecord(nodes_.size());
}
 
madara::knowledge::KnowledgeRecord
madara::expression::SystemCallSetClock::prune(bool& can_change)
{
  // user can always change a function, and we have no control over
  // what it does. Consequently, a function node cannot be pruned out
  // under any situation
  can_change = true;
 
  madara::knowledge::KnowledgeRecord result;
 
  for (ComponentNodes::iterator i = nodes_.begin(); i != nodes_.end(); ++i)
  {
    bool arg_can_change = false;
    result = (*i)->prune(arg_can_change);
 
    if (!arg_can_change && dynamic_cast<LeafNode*>(*i) == 0)
    {
      delete *i;
      *i = new LeafNode(*(this->logger_), result);
    }
  }
 
  if (nodes_.size() > 2 || nodes_.size() == 0)
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::SystemCallSetClock: "
        "KARL COMPILE ERROR: System call set_clock requires 1-2 arguments, "
        "e.g., set_clock (5) or set_clock (var, 5)\n");
  }
 
  return result;
}
 
madara::knowledge::KnowledgeRecord
madara::expression::SystemCallSetClock::evaluate(
    const madara::knowledge::KnowledgeUpdateSettings& settings)
{
  knowledge::KnowledgeRecord return_value;
 
  if (nodes_.size() == 1)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::SystemCallSetClock: "
        "System call set_clock is setting the system clock\n");
 
    context_.set_clock(nodes_[0]->evaluate(settings).to_integer());
 
    return madara::knowledge::KnowledgeRecord(context_.get_clock());
  }
  else if (nodes_.size() == 2)
  {
    madara_logger_ptr_log(logger_, logger::LOG_MINOR,
        "madara::expression::SystemCallSetClock: "
        "System call set_clock is setting a variable clock\n");
 
    VariableNode* variable = dynamic_cast<VariableNode*>(nodes_[0]);
    if (variable)
    {
      variable->get_record()->clock =
          (uint64_t)nodes_[1]->evaluate(settings).to_integer();
 
      return madara::knowledge::KnowledgeRecord(variable->get_record()->clock);
    }
    else
    {
      madara_logger_ptr_log(logger_, logger::LOG_ERROR,
          "madara::expression::SystemCallSetClock: "
          "KARL RUNTIME ERROR:"
          "System call set_clock with 2 arguments "
          "requires the first argument to be a variable\n");
 
      throw exceptions::KarlException(
          "madara::expression::SystemCallSetClock: "
          "KARL RUNTIME ERROR: "
          "System call set_clock with 2 arguments "
          "requires the first argument to be a variable\n");
    }
  }
  else
  {
    madara_logger_ptr_log(logger_, logger::LOG_ERROR,
        "madara::expression::SystemCallSetClock: "
        "KARL RUNTIME ERROR:"
        "System call set_clock requires 1-2 arguments, "
        "e.g., set_clock (5) or set_clock (var, 5)\n");
 
    throw exceptions::KarlException(
        "madara::expression::SystemCallSetClock: "
        "KARL RUNTIME ERROR: "
        "System call set_clock requires 1-2 arguments, "
        "e.g., set_clock (5) or set_clock (var, 5)\n");
  }
 
  return return_value;
}
 
// accept a visitor
void madara::expression::SystemCallSetClock::accept(
    madara::expression::Visitor& visitor) const
{
  visitor.visit(*this);
}
 
#endif  // _MADARA_NO_KARL_