28 lines
758 B
Python
28 lines
758 B
Python
import string
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class SentenceVariable(object):
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symbols = string.ascii_lowercase
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class SupportSign(object):
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symbols_open = ['[', '{', '(']
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symbols_close = [']', '}', ')']
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symbols = symbols_open + symbols_close
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@classmethod
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def get_closed_symbol(cls, open_symbol):
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return cls.symbols_close[cls.symbols_open.index(open_symbol)]
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class SentenceConjunction(object):
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symbols_conjunction = ['.', '*', '&', '∧', 'AND']
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symbols_alternative = ['+', '∧', 'A', 'OR']
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symbols_implication = ['⇒', '→', '⊃']
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symbols_equivalence = ['⇔', '≡', '↔']
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symbols = symbols_conjunction + symbols_alternative + symbols_implication + symbols_implication
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class Negation(object):
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symbols = ['!', '¬', '˜']
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