Direction.hpp

// Copyright 2016 Anton Erholt <aerholt@kth.se>

#ifndef LAB3_DIRECTION_HPP_
#define LAB3_DIRECTION_HPP_

#include <string>
#include <set>
#include <sstream>

namespace lab3 {

typedef std::string Direction;

const Direction EAST = "E";
const Direction WEST = "W";
const Direction NORTH = "N";
const Direction SOUTH = "S";
const Direction UP = "U";
const Direction DOWN = "D";

const std::set<Direction> DIRECTIONS() {
  std::set<Direction> dirs;

  dirs.insert(EAST);
  dirs.insert(WEST);
  dirs.insert(NORTH);
  dirs.insert(SOUTH);
  dirs.insert(UP);
  dirs.insert(DOWN);
  return dirs;
}


Direction parseDirection(std::string dir) {
  if (dir.empty())
    throw std::invalid_argument("No such direction");
  char c = *(dir.begin());
  std::locale loc;
  c = std::toupper(c, loc);
  std::string s;
  s += c;

  if (DIRECTIONS().find(s) != DIRECTIONS().end()) {
    return (Direction) s;
  }
  throw std::invalid_argument("No such direction.");
}

}  // namespace lab3

#endif  // LAB3_DIRECTION_HPP_