Method: Uci#fenstring

Defined in:
lib/uci.rb

#fenstring ⇒ Object

return the state of the interal board in a FEN (Forsyth–Edwards Notation) string, SHORT format (no castling info, move, etc)



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# File 'lib/uci.rb', line 287

def fenstring
  fen = []
  (@board.size-1).downto(0).each do |rank_index|
    rank = @board[rank_index]
    if rank.include?(nil)
      if rank.select{|r|r.nil?}.size == 8
        fen << 8
      else
        rank_str = ""
        empties = 0
        rank.each do |r|
          if r.nil?
            empties += 1
          else
            if empties > 0
              rank_str << empties.to_s
              empties = 0
            end
            rank_str << r
          end
        end
        rank_str << empties.to_s if empties > 0
        fen << rank_str
      end
    else
      fen << rank.join('')
    end
  end
  fen.join('/')
end