Parser.py

class Parser:
    u"""REPLのRead部分を司る"""
    phase = 'introduction'
    def __init__(self):
        pass
    def read(self):
        u"""入力関数
phaseの情報によって動作が変わる"""
        if self.phase == 'input-numbers':
            return (self.phase, self.__integer())
        elif self.phase == 'play-again?' or\
             self.phase == 'instruction':
            return (self.phase, self.__yes_or_no_p())
        else:
            return (self.phase, None)
    def __integer(self):
        u"""整数の入力をコントロール"""
        var = raw_input()
        try: return int(var)
        except ValueError:
            return self.__integer()
    def __yes_or_no_p(self):
        u"""入力がYesかNoか判定して真偽値を返す"""
        def y_or_n_p(string):
            if string.upper() in ('Y', 'YES'):
                return True
            else:
                return False
        t = ('Y', 'YES', 'N', 'NO')
        i = raw_input()
        if i.upper() in t:
            return y_or_n_p(i)
        else:
            return self.__yes_or_no_p()