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#
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#
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# 2005-11-18
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# 2005-11-18
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# * Just getting the basics in place, since we haven't been given
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# * Just getting the basics in place, since we haven't been given
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#   the whole description of the project yet.
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#   the whole description of the project yet.
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#
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#
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# 2005-11-26
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# * Got the whole class working, now to implement pretty-printing
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#
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# Check for <Python-2.3 compatibility (boolean values)
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# Check for <Python-2.3 compatibility (boolean values)
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try:
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try:
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  True, False
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  True, False
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except NameError:
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except NameError:
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        self.__clear()
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        self.__clear()
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    def __clear(self):
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    def __clear(self):
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        self.str = ""   # the string of input to test
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        self.str = ""   # the string of input to test
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        self.strpos = 0 # the current position in str
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        self.strpos = 0 # the current position in str
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        self.derivation = ""
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    def __replace_sym(self, to_repl, with_this):
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        """Replace a string in the derivation with another string"""
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        pos = s.find(to_repl)
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        if pos == -1:
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            raise ValueError
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        self.derivation = s[:pos] + str(with_this) + s[pos+len(to_repl):]
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    def __input_test_str(self):
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    def __input_test_str(self):
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        self.str = raw_input("input str: ")
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        self.str = raw_input("input str: ")
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    def main_menu(self):
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    def main_menu(self):