lib/games/chess/policy.rb

   1 module Chess
   2   class Policy
   3     def initialize(move_factory)
   4       @move_factory = move_factory
   5     end
   6
   7     def movable?(state, p)
   8       piece = state.board[p]
   9       piece && piece.color == state.turn
  10     end
  11
  12     def droppable?(state, color, index)
  13       color == state.turn
  14     end
  15
  16     def new_move(state, src, dst, opts = {})
  17       @move_factory.new(src, dst, opts.merge(:promotion => :queen))
  18     end
  19   end
  20 end