96 lines
2.7 KiB
Ruby
96 lines
2.7 KiB
Ruby
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# frozen_string_literal: true
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require_relative './position'
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module ReversiMethods
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WHITE_STONE = 'W'
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BLACK_STONE = 'B'
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BLANK_CELL = '-'
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def build_initial_board
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# boardは盤面を示す二次元配列
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board = Array.new(8) { Array.new(8, BLANK_CELL) }
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board[3][3] = WHITE_STONE # d4
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board[4][4] = WHITE_STONE # e5
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board[3][4] = BLACK_STONE # d5
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board[4][3] = BLACK_STONE # e4
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board
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end
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def output(board)
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puts " #{Position::COL.join(' ')}"
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board.each_with_index do |row, i|
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print Position::ROW[i]
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row.each do |cell|
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case cell
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when WHITE_STONE then print ' ○'
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when BLACK_STONE then print ' ●'
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else print ' -'
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end
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end
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print "\n"
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end
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end
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def copy_board(to_board, from_board)
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from_board.each_with_index do |cols, row|
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cols.each_with_index do |cell, col|
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to_board[row][col] = cell
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end
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end
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end
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def put_stone(board, cell_ref, stone_color, dry_run: false)
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pos = Position.new(cell_ref)
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raise '無効なポジションです' if pos.invalid?
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raise 'すでに石が置かれています' unless pos.stone_color(board) == BLANK_CELL
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# コピーした盤面にて石の配置を試みて、成功すれば反映する
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copied_board = Marshal.load(Marshal.dump(board))
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copied_board[pos.row][pos.col] = stone_color
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turn_succeed = false
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Position::DIRECTIONS.each do |direction|
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next_pos = pos.next_position(direction)
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turn_succeed = true if turn(copied_board, next_pos, stone_color, direction)
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end
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copy_board(board, copied_board) if !dry_run && turn_succeed
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turn_succeed
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end
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def turn(board, target_pos, attack_stone_color, direction)
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return false if target_pos.out_of_board?
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return false if target_pos.stone_color(board) == attack_stone_color
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return false if target_pos.stone_color(board) == BLANK_CELL
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next_pos = target_pos.next_position(direction)
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if (next_pos.stone_color(board) == attack_stone_color) || turn(board, next_pos, attack_stone_color, direction)
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board[target_pos.row][target_pos.col] = attack_stone_color
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true
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else
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false
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end
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end
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def finished?(board)
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!placeable?(board, WHITE_STONE) && !placeable?(board, BLACK_STONE)
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end
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def placeable?(board, attack_stone_color)
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board.each_with_index do |cols, row|
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cols.each_with_index do |cell, col|
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next unless cell == BLANK_CELL
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position = Position.new(row, col)
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return true if put_stone(board, position.to_cell_ref, attack_stone_color, dry_run: true)
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end
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end
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false
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end
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def count_stone(board, stone_color)
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board.flatten.count { |cell| cell == stone_color }
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end
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end
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