Class: Shogi::Board

Inherits:
Object
  • Object
show all
Defined in:
lib/shogi/board.rb

Defined Under Namespace

Classes: CodingError, Error, FormatError, MoveError, MovementError, UndefinedPieceError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(default_format = :csa, position = nil) ⇒ Board

Returns a new instance of Board.



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# File 'lib/shogi/board.rb', line 12

def initialize(default_format=:csa, position=nil)
  @default_format = default_format
  if position
    set_from_csa(position)
  else
    @position = default_position
    @captured = []
  end
  @validate_movement = true
end

Instance Attribute Details

#default_format ⇒ Object

Returns the value of attribute default_format.



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# File 'lib/shogi/board.rb', line 10

def default_format
  @default_format
end

#validate_movement ⇒ Object

Returns the value of attribute validate_movement.



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# File 'lib/shogi/board.rb', line 11

def validate_movement
  @validate_movement
end

Instance Method Details

#at(place) ⇒ Object 



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# File 'lib/shogi/board.rb', line 129

def at(place)
  array_x = to_array_x_from_shogi_x(place[0].to_i)
  array_y = to_array_y_from_shogi_y(place[1].to_i)
  @position[array_y][array_x]
end

#move(movement_lines, format = @default_format) ⇒ Object 



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# File 'lib/shogi/board.rb', line 121

def move(movement_lines, format=@default_format)
  movement_lines.each_line do |movement|
    movement.chomp!
    __send__("move_by_#{format.to_s}", movement)
  end
  self
end

#move_from_csa(movement) ⇒ Object 



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# File 'lib/shogi/board.rb', line 116

def move_from_csa(movement)
  $stderr.puts "warning: Shogi::Board#move_from_csa(movement) is deprecated. Use Shogi::Board#move(movement, :csa)"
  move(movement, :csa)
end

#set_from_csa(csa) ⇒ Object 



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# File 'lib/shogi/board.rb', line 53

def set_from_csa(csa)
  position = []
  cell_pattern = '[+-][A-Z]{2}| \* '
  csa_lines = csa.each_line.to_a
  csa_lines.slice(0, 9).to_enum.with_index do |row, i|
    position_row = []
    row.chomp!
    unless /\AP#{i + 1}(#{cell_pattern}){9}\z/ =~ row
      raise FormatError, "Format Error: line P#{i + 1}"
    end
    row[2..28].scan(/#{cell_pattern}/) do |cell|
      if cell == " * "
        position_row << ""
      else
        position_row << cell
      end
    end
    position << position_row
  end
  @position = position

  captured = []
  csa_lines.slice(9, 2).each do |captured_line|
    captured_line.chomp!
    unless /\AP[+-](00[A-Z]{2})*\z/ =~ captured_line
      raise FormatError, "Format Error: captured piece line"
    end
    turn = captured_line[1]
    captured_line[2..-1].scan(/00([A-Z]{2})/) do |cell|
      captured << turn + cell[0]
    end
  end
  @captured = captured
end

#show(format = @default_format) ⇒ Object 



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# File 'lib/shogi/board.rb', line 135

def show(format=@default_format)
  $stdout.puts __send__("to_#{format}")
end

#to_csa ⇒ Object 



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# File 'lib/shogi/board.rb', line 23

def to_csa
  csa_rows = ""

  @position.each_with_index do |row, i|
    csa_row = ""
    row.each do |cell|
      if cell == ""
        csa_row << " * "
      else
        csa_row << cell
      end
    end
    csa_rows << "P#{i + 1}#{csa_row}\n"
  end

  sente = "P+"
  gote = "P-"
  @captured.each do |piece|
    if piece[0] == "+"
      sente << "00#{piece[1..2]}"
    else
      gote << "00#{piece[1..2]}"
    end
  end
  csa_rows << "#{sente}\n"
  csa_rows << "#{gote}\n"

  csa_rows
end

#to_usi ⇒ Object 



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# File 'lib/shogi/board.rb', line 88

def to_usi
  @position.map {|row|
    usi_row = ""
    space_count = 0
    row.each do |cell|
      if cell == ""
        space_count += 1
      else
        if space_count > 0
          usi_row << space_count.to_s
          space_count = 0
        end
        usi = Piece.const_get(cell[1..2]).new.usi
        if cell[0] == "-"
          usi_row << usi.downcase
        else
          usi_row << usi
        end
      end
    end
    if space_count > 0
      usi_row << space_count.to_s
      space_count = 0
    end
    usi_row
  }.join("/") << "\n"
end