LRAction.cpp

#include "LRAction.hpp"

#include <memory>

/********************----- CLASS: LRAction -----********************/
LRAction::LRAction(Production const * const i_production)
:m_production(i_production),m_state(0),m_type(LRAction::Type::REDUCE)
{
  if(m_production == nullptr)
  {
    throw std::bad_weak_ptr();
  }
}

LRAction::LRAction(LRState const i_state)
:m_production(nullptr),m_state(i_state),m_type(LRAction::Type::SHIFT)
{
}

LRAction::LRAction(LRAction::Type const i_type)
:m_production(nullptr),m_state(0),m_type(i_type)
{
}

bool LRAction::isAccept() const
{
  return (m_type == LRAction::Type::ACCEPT);
}

bool LRAction::isReduce() const
{
  return (m_type == LRAction::Type::REDUCE);
}

bool LRAction::isShift() const
{
  return (m_type == LRAction::Type::SHIFT);
}

Production const &LRAction::production() const
{
  if(m_production == nullptr)
  {
    throw std::bad_weak_ptr();
  }

  return (*m_production);
}

LRState const &LRAction::state() const
{
  return m_state;
}

std::string LRAction::toString() const
{
  std::string outputString;

  switch(m_type)
  {
    case LRAction::Type::ACCEPT:
      outputString += "ACCEPT()";
      break;
    case LRAction::Type::REDUCE:
      outputString += "REDUCE(" + m_production->toString() + ")";
      break;
    case LRAction::Type::SHIFT:
      outputString += "SHIFT(" + std::to_string(m_state) + ")";
      break;
    default:
      throw std::logic_error("Unknown type");
  }

  return outputString;
}

bool LRAction::operator==(LRAction const &i_otherAction) const
{
  if(m_type != i_otherAction.m_type)
  {
    return false;
  }

  if(m_state != i_otherAction.m_state)
  {
    return false;
  }

  if(m_production != i_otherAction.m_production)
  {
    return false;
  }

  return true;
}
/**************************************************/

/********************----- Helper Functions -----********************/
LRAction ACCEPT()
{
  return LRAction(LRAction::Type::ACCEPT);
}

LRAction REDUCE(Production const * const i_production)
{
  return LRAction(i_production);
}

LRAction SHIFT(LRState const i_state)
{
  return LRAction(i_state);
}
/**************************************************/