You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: board.rb
    path of file: ./repos/truffleruby/bench/rubykon/rubykon/lib/rubykon
    
    the code of the file until where you have to start completion: # Board it acts a bit like a giant 2 dimensional array - but one based
# not zero based
module Rubykon
  class Board
    include Enumerable

    BLACK = :black
    WHITE = :white
    EMPTY = nil

    attr_reader :size, :board

    # weird constructor for dup
    def initialize(size, board = create_board(size))
      @size  = size
      @board = board
    end

    def each
      @board.each_with_index do |color, identifier|
        yield identifier, color
      e
    
    def to_s
      @board.each_slice(@size).map do |row|
        row_chars = row.map do |color|
          COLOR_TO_CHARACTER.fetch(color)
        end
        row_chars.join
      end.join("\n") << "\n"
    end

    def dup
      self.class.new @size, @board.dup
    end

    MAKE_IT_OUT_OF_BOUNDS = 1000

    def identifier_for(x, y)
      return nil if x.nil? || y.nil?
      x = MAKE_IT_OUT_OF_BOUNDS if x > @size || x < 1
      (y - 1) * @size + (x - 1)
    end

    def x_y_from(identifier)
      x = (identifier % (@size)) + 1
      y = (identifier / (@size)) + 1
      [x, y]
    end

    def self.from(string)
      new_board = new(string.index("\n") / CHARS_PER_GLYPH)
      each_move_from(string) do |index, color|
        new_board[index] = color
      end
      new_board
    end

    def self.each_move_from(string)
      glyphs = string.tr("\n", '').chars.each_slice(CHARS_PER_GLYPH).map(&:join)
      relevant_glyphs = glyphs.select do |glyph|
        CHARACTER_TO_COLOR.has_key?(glyph)
      end
      relevant_glyphs.each_with_index do |glyph, index|
        yield index, CHARACTER_TO_COLOR.fetch(glyph)
      end
    end

    def self.convert(old_board_string)
      old_board_string.gsub /[XO-]/, LEGACY_CONVERSION
    end

    private

    def create_board(size)
      Array.new(size * size, EMPTY)
    end

    def handle_edge_cases(x, y, above, below, left, right, board_edge, not_on_x_edge, not_on_y_edge)
      left_edge   = x == 0
      right_edge  = x == board_edge
      top_edge    = y == 0
      bottom_edge = y == board_edge
      if left_edge && not_on_y_edge
        [[right, @board[right]], [below, @board[below]],
         [above, @board[above]]]
      elsif right_edge && not_on_y_edge
        [[below, @board[below]],
         [left, @board[left]], [above, @board[above]]]
      elsif top_edge && not_on_x_edge
        [[right, @board[right]], [below, @board[below]],
         [left, @board[left]]]
      elsif bottom_edge && not_on_x_edge
        [[right, @board[right]],
         [left, @board[left]], [above, @board[above]]]
      else
        handle_corner_case(above, below, left, right, bottom_edge, left_edge, right_edge, top_edge)
      end
    end