Class: PGN::Game

Inherits:
Object
  • Object
show all
Defined in:
lib/pgn/game.rb

Overview

Game holds all of the information about a game. It is either the result of parsing a PGN file, or created by hand.

A Game has an interactive #play method, and can also return a list of positions in Position format or FEN.

Constant Summary collapse

LEFT = 
%r{(a|\x1B\[D)\z}
RIGHT = 
%r{(d|\x1B\[C)\z}
EXIT = 
%r{(q|\x03)\z}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(moves, tags = nil, result = nil) ⇒ Game

Returns a new instance of Game.

Parameters:

  • moves (Array<String>) —

    a list of moves in SAN

  • tags (Hash<String, String>) (defaults to: nil) —

    metadata about the game

  • result (String) (defaults to: nil) —

    the outcome of the game



63
64
65
66
67
 
# File 'lib/pgn/game.rb', line 63

def initialize(moves, tags = nil, result = nil)
  self.moves  = moves
  self.tags   = tags
  self.result = result
end

Instance Attribute Details

#moves ⇒ Array<String>

Returns a list of the moves in standard algebraic notation.

Examples:

game.moves #=> ["e4", "c5", "Nf3", "d6", "d4", "cxd4"]

Returns:

  • (Array<String>) —

    a list of the moves in standard algebraic notation



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
 
# File 'lib/pgn/game.rb', line 52

class Game
  attr_accessor :tags, :moves, :result

  LEFT  = %r{(a|\x1B\[D)\z}
  RIGHT = %r{(d|\x1B\[C)\z}
  EXIT  = %r{(q|\x03)\z}

  # @param moves [Array<String>] a list of moves in SAN
  # @param tags [Hash<String, String>] metadata about the game
  # @param result [String] the outcome of the game
  #
  def initialize(moves, tags = nil, result = nil)
    self.moves  = moves
    self.tags   = tags
    self.result = result
  end

  # @param moves [Array<String>] a list of moves in SAN
  #
  # Standardize castling moves to use O's instead of 0's
  #
  def moves=(moves)
    @moves = moves.map do |m|
      if m.is_a? String
        MoveText.new(m.gsub("0", "O"))
      else
        MoveText.new(m.notation.gsub("0", "O"), m.annotation, m.comment, m.variations)
      end
    end
  end

  # @return [Array<PGN::Position>] list of the {PGN::Position}s in the game
  #
  def positions
    @positions ||= begin
      position = PGN::Position.start
      arr = [position]
      self.moves.each do |move|
        new_pos = position.move(move.notation)
        arr << new_pos
        position = new_pos
      end
      arr
    end
  end

  # @return [Array<String>] list of the fen representations of the positions
  #
  def fen_list
    self.positions.map {|p| p.to_fen.inspect }
  end

  # Interactively step through the game
  #
  # Use +d+ to move forward, +a+ to move backward, and +^C+ to exit.
  #
  def play
    index = 0
    hist = Array.new(3, "")

    loop do
      puts "\e[H\e[2J"
      puts self.positions[index].inspect
      hist[0..2] = (hist[1..2] << STDIN.getch)

      case hist.join
      when LEFT
        index -= 1 if index > 0
      when RIGHT
        index += 1 if index < self.moves.length
      when EXIT
        break
      end
    end
  end
end

#result ⇒ String

Returns the outcome of the game.

Examples:

game.result #=> "1-0"

Returns:

  • (String) —

    the outcome of the game



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
 
# File 'lib/pgn/game.rb', line 52

class Game
  attr_accessor :tags, :moves, :result

  LEFT  = %r{(a|\x1B\[D)\z}
  RIGHT = %r{(d|\x1B\[C)\z}
  EXIT  = %r{(q|\x03)\z}

  # @param moves [Array<String>] a list of moves in SAN
  # @param tags [Hash<String, String>] metadata about the game
  # @param result [String] the outcome of the game
  #
  def initialize(moves, tags = nil, result = nil)
    self.moves  = moves
    self.tags   = tags
    self.result = result
  end

  # @param moves [Array<String>] a list of moves in SAN
  #
  # Standardize castling moves to use O's instead of 0's
  #
  def moves=(moves)
    @moves = moves.map do |m|
      if m.is_a? String
        MoveText.new(m.gsub("0", "O"))
      else
        MoveText.new(m.notation.gsub("0", "O"), m.annotation, m.comment, m.variations)
      end
    end
  end

  # @return [Array<PGN::Position>] list of the {PGN::Position}s in the game
  #
  def positions
    @positions ||= begin
      position = PGN::Position.start
      arr = [position]
      self.moves.each do |move|
        new_pos = position.move(move.notation)
        arr << new_pos
        position = new_pos
      end
      arr
    end
  end

  # @return [Array<String>] list of the fen representations of the positions
  #
  def fen_list
    self.positions.map {|p| p.to_fen.inspect }
  end

  # Interactively step through the game
  #
  # Use +d+ to move forward, +a+ to move backward, and +^C+ to exit.
  #
  def play
    index = 0
    hist = Array.new(3, "")

    loop do
      puts "\e[H\e[2J"
      puts self.positions[index].inspect
      hist[0..2] = (hist[1..2] << STDIN.getch)

      case hist.join
      when LEFT
        index -= 1 if index > 0
      when RIGHT
        index += 1 if index < self.moves.length
      when EXIT
        break
      end
    end
  end
end

#tags ⇒ Hash<String, String>

Returns metadata about the game.

Examples:

game.tags #=> {"White" => "Kasparov", "Black" => "Deep Blue"}

Returns:

  • (Hash<String, String>) —

    metadata about the game



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
 
# File 'lib/pgn/game.rb', line 52

class Game
  attr_accessor :tags, :moves, :result

  LEFT  = %r{(a|\x1B\[D)\z}
  RIGHT = %r{(d|\x1B\[C)\z}
  EXIT  = %r{(q|\x03)\z}

  # @param moves [Array<String>] a list of moves in SAN
  # @param tags [Hash<String, String>] metadata about the game
  # @param result [String] the outcome of the game
  #
  def initialize(moves, tags = nil, result = nil)
    self.moves  = moves
    self.tags   = tags
    self.result = result
  end

  # @param moves [Array<String>] a list of moves in SAN
  #
  # Standardize castling moves to use O's instead of 0's
  #
  def moves=(moves)
    @moves = moves.map do |m|
      if m.is_a? String
        MoveText.new(m.gsub("0", "O"))
      else
        MoveText.new(m.notation.gsub("0", "O"), m.annotation, m.comment, m.variations)
      end
    end
  end

  # @return [Array<PGN::Position>] list of the {PGN::Position}s in the game
  #
  def positions
    @positions ||= begin
      position = PGN::Position.start
      arr = [position]
      self.moves.each do |move|
        new_pos = position.move(move.notation)
        arr << new_pos
        position = new_pos
      end
      arr
    end
  end

  # @return [Array<String>] list of the fen representations of the positions
  #
  def fen_list
    self.positions.map {|p| p.to_fen.inspect }
  end

  # Interactively step through the game
  #
  # Use +d+ to move forward, +a+ to move backward, and +^C+ to exit.
  #
  def play
    index = 0
    hist = Array.new(3, "")

    loop do
      puts "\e[H\e[2J"
      puts self.positions[index].inspect
      hist[0..2] = (hist[1..2] << STDIN.getch)

      case hist.join
      when LEFT
        index -= 1 if index > 0
      when RIGHT
        index += 1 if index < self.moves.length
      when EXIT
        break
      end
    end
  end
end

Instance Method Details

#fen_list ⇒ Array<String>

Returns list of the fen representations of the positions.

Returns:

  • (Array<String>) —

    list of the fen representations of the positions



100
101
102
 
# File 'lib/pgn/game.rb', line 100

def fen_list
  self.positions.map {|p| p.to_fen.inspect }
end

#play ⇒ Object

Interactively step through the game

Use d to move forward, a to move backward, and ^C to exit.



108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/pgn/game.rb', line 108

def play
  index = 0
  hist = Array.new(3, "")

  loop do
    puts "\e[H\e[2J"
    puts self.positions[index].inspect
    hist[0..2] = (hist[1..2] << STDIN.getch)

    case hist.join
    when LEFT
      index -= 1 if index > 0
    when RIGHT
      index += 1 if index < self.moves.length
    when EXIT
      break
    end
  end
end

#positions ⇒ Array<PGN::Position>

Returns list of the Positions in the game.

Returns:



85
86
87
88
89
90
91
92
93
94
95
96
 
# File 'lib/pgn/game.rb', line 85

def positions
  @positions ||= begin
    position = PGN::Position.start
    arr = [position]
    self.moves.each do |move|
      new_pos = position.move(move.notation)
      arr << new_pos
      position = new_pos
    end
    arr
  end
end