Map formatting #2

[kras2v]

• Your program must take as a first argument a scene description file with the .cub extension.

• The map must be composed of only 6 possible characters: 0 for an empty space,
  -1 for a wall, and N,S,E or W for the player’s start position and spawning
  orientation.

  This is a simple valid map:
  111111
  100101
  101001
  1100N1
  111111
  

• The map must be closed/surrounded by walls, if not the program must return
  an error.

• Except for the map content, each type of element can be separated by one or
  more empty lines.

• Except for the map content which always has to be the last, each type
  of element can be set in any order in the file.

• Except for the map, each type of information from an element can be separated
  by one or more spaces.

• The map must be parsed as it looks in the file. Spaces are a valid part of the
  map and are up to you to handle. You must be able to parse any kind of map,
  as long as it respects the rules of the map.