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50 lines
1.2 KiB
50 lines
1.2 KiB
8 years ago
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# By alan snape
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# All rights reserved.
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class RockPaperScissors
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# Exceptions this class can raise:
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class NoSuchStrategyError < StandardError; end
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# check strategy is legal or not
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def self.checkStrategy(stg)
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if 'P' != stg && 'R' != stg && 'S' != stg then
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raise NoSuchStrategyError, 'Strategy must be one of R,P,S'
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end
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end
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# a single round game
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def self.winner(player1, player2)
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stg1, stg2 = player1[1], player2[1]
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self.checkStrategy(stg1)
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self.checkStrategy(stg2)
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if stg1 == stg2 then
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return player1
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elsif 'P' == stg1 && 'S' == stg2 then
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return player2
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elsif 'S' == stg1 && 'P' == stg2 then
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return player1
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else
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return stg1 < stg2 ? player1 : player2
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end
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end
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# if there is a sub game then returns the winner of it
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# else return this player himself
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def self.tournament_match(game)
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if game[0].kind_of?(Array) then
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return self.tournament_winner(game)
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else
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return game
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end
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end
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# tournament game rounds
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def self.tournament_winner(tournament)
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player1 = self.tournament_match(tournament[0])
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player2 = self.tournament_match(tournament[1])
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return self.winner(player1, player2)
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end
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end
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