lib/games/shogi/piece.rb

   1 require 'games/chess/piece'
   2
   3 module Shogi
   4
   5 class Piece < Chess::Piece
   6   TYPES = { 'P' => :pawn,
   7             'R' => :rook,
   8             'B' => :bishop,
   9             'N' => :horse,
  10             'G' => :gold,
  11             'S' => :silver,
  12             'L' => :lance,
  13             'K' => :king }
  14   SYMBOLS = TYPES.invert
  15
  16   def self.type_from_symbol(sym)
  17     promoted = sym[0,1] == '+'
  18     sym = sym[1..-1] if promoted
  19     type = TYPES[sym.upcase]
  20     type = ('promoted_' + type.to_s).to_sym if promoted
  21     type
  22   end
  23
  24   def self.symbol(type)
  25     promoted = type.to_s =~ /^promoted_/
  26     base_type = if promoted
  27       type.to_s.gsub(/^promoted_/, '').to_sym
  28     else
  29       type
  30     end
  31     result = SYMBOLS[base_type] || '?'
  32     result = '+' + result if promoted
  33     result
  34   end
  35 end
  36
  37 end