Contents

module Rubykon
  class MoveValidator
    
    def valid?(identifier, color, game)
      board = game.board
      no_double_move?(color, game) &&
        (Game.pass?(identifier) ||
        (move_on_board?(identifier, board) &&
          spot_unoccupied?(identifier, board) &&
          no_suicide_move?(identifier, color, game) &&
          no_ko_move?(identifier, game)))
    end

    def trusted_valid?(identifier, color, game)
      board = game.board
      spot_unoccupied?(identifier, board) &&
        no_ko_move?(identifier, game) &&
        no_suicide_move?(identifier, color, game)

    end

    private
    def no_double_move?(color, game)
      color == game.next_turn_color
    end

    def move_on_board?(identifier, board)
      board.on_board?(identifier)
    end
    
    def spot_unoccupied?(identifier, board)
      board[identifier] == Board::EMPTY
    end

    def no_suicide_move?(identifier, color, game)
      enemy_color         = Game.other_color(color)
      board               = game.board
      board_neighbours_of = board.neighbours_of(identifier)
      p identifier if board_neighbours_of.nil?
      board_neighbours_of.any? do |n_identifier, n_color|
        (n_color == Board::EMPTY) ||
          (n_color == color) && (liberties_at(n_identifier, game) > 1) ||
          (n_color == enemy_color) && (liberties_at(n_identifier, game) <= 1)
      end
    end

    def liberties_at(identifier, game)
      game.group_tracker.liberty_count_at(identifier)
    end

    def no_ko_move?(identifier, game)
      identifier != game.ko
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
rubykon-0.3.1	lib/rubykon/move_validator.rb
rubykon-0.3.0	lib/rubykon/move_validator.rb