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(csa = nil) ⇒ Board

Returns a new instance of Board.



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

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

Instance Attribute Details

#validate_movement ⇒ Object

Returns the value of attribute validate_movement.



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

def validate_movement
  @validate_movement
end

Instance Method Details

#move_from_csa(csa) ⇒ Object 



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# File 'lib/shogi/board.rb', line 110

def move_from_csa(csa)
  unless /\A[+-](00|[1-9]{2})[1-9]{2}[A-Z]{2}\z/ =~ csa
    raise FormatError, "Wrong CSA format: #{csa}"
  end

  unless Piece.const_defined?(csa[5..6])
    raise UndefinedPieceError, "Undefined piece: #{csa[5..6]}"
  end

  if csa[1..2] == "00"
    before_piece = csa[0] + csa[5..6]
    unless @captured.include?(before_piece)
      raise MoveError, "Not captured piece: #{csa}"
    end
    before_cell = before_piece
    before_piece = eval("Piece::#{before_cell[1..2]}").new
  else
    before_x = 9 - csa[1].to_i
    before_y = csa[2].to_i - 1
    before_cell = @position[before_y][before_x]
    if before_cell == ""
      raise MoveError, "Before cell is blank"
    end
    before_piece = eval("Piece::#{before_cell[1..2]}").new

    unless csa[0] == before_cell[0]
      raise MoveError, "Don't your piece: #{before_cell}"
    end
    unless csa[5..6] == before_cell[1..2]
      after_piece = eval("Piece::#{csa[5..6]}").new
      unless before_piece.promoter == after_piece.class
      raise MoveError, "Don't promote: #{before_cell[1..2]} -> #{csa[5..6]}"
      end

      after_y = csa[4].to_i - 1
      if csa[0] == "+"
        unless after_y < 3 || before_y < 3
          raise_movement_error("Don't promote line: #{csa}")
        end
      else
        unless after_y > 6 || before_y > 6
          raise_movement_error("Don't promote line: #{csa}")
        end
      end
    end
  end

  after_x = 9 - csa[3].to_i
  after_y = csa[4].to_i - 1
  after_cell = @position[after_y][after_x]
  if csa[0] == after_cell[0]
    raise MoveError, "Your piece on after cell: #{csa}"
  end

  if csa[1..2] == "00"
    unless after_cell == ""
      raise MoveError, "Exist piece on after cell"
    end
  else
    if csa[0] == "+"
      movement_x = after_x - before_x
      movement_y = before_y - after_y
    else
      movement_x = before_x - after_x
      movement_y = after_y - before_y
    end

    unless before_piece.move?(movement_x, movement_y)
      raise_movement_error("Invalid movement")
    end
  end

  unless after_cell == ""
    after_piece = eval("Piece::#{after_cell[1..2]}").new
    if after_piece.class.const_defined?(:CHILD)
      @captured << "#{csa[0]}#{after_piece.class::CHILD}"
    else
      @captured << "#{csa[0]}#{after_cell[1..2]}"
    end
  end
  @position[after_y][after_x] = "#{csa[0]}#{csa[5..6]}"

  if csa[1..2] == "00"
    used = nil

    @captured.each_with_index do |captured_piece, i|
      if captured_piece == before_cell
        used = @captured.delete_at(i)
        break
      end
    end

    unless used == before_cell
      raise CodingError, "[Bug] missing piece in captured"
    end
  else
    @position[before_y][before_x] = ""
  end

  true
end

#move_from_csa_lines(csa_lines) ⇒ Object 



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# File 'lib/shogi/board.rb', line 212

def move_from_csa_lines(csa_lines)
  csa_lines.each_line do |csa|
    csa.chomp!
    move_from_csa(csa)
  end
end

#set_from_csa(csa) ⇒ Object 



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# File 'lib/shogi/board.rb', line 51

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 #{i + 1}"
    end
    row[2..28].scan(/#{cell_pattern}/) do |cell|
      position_row << cell
    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 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

#to_csa ⇒ Object 



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# File 'lib/shogi/board.rb', line 21

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 82

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 = eval("Piece::#{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