70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
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import sys
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#TODO: dodać parentices
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class AbstractInterpreter:
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def __init__(self):
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pass
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def isValid(formula:str)->bool:
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raise NotImplementedError
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class SimpleInterpreter(AbstractInterpreter):
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def __init__(self):
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pass
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def isValid(self,formula)->bool:
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print("is valid?")
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variables = {}
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f=[]
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def isBlacklisted(char):
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return char in ['\n', '\t', ' ']
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def isSign(char):
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logic_signs = ['=', '>', '&', '|', '!', '(', ')']
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return char in logic_signs
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def isVariable(char):
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return not isSign(char)
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def isNegation(char):
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return char == '!'
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#print(vars(formula))
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for i,char in enumerate(formula.s):
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if isBlacklisted(char): return False
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print(char)
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prev = formula.s[i-1] if i>0 else None #None, gdy jesteśmy na pierwszym znaku
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if isSign(char):
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if (not isNegation(char)):
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if isSign(prev) and not isNegation(prev): # tylko negacje mogą się powtarzać po innym znaku
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return False
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else:
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if isVariable(prev): # obrona przed a!>b
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return False
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else:
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#if current char is a variable
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if isVariable(prev) and prev is not None: #Obrona abc>d
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print("previous is also a variable");
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return False
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return True
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class Formula:
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def __init__(self, formula_string:str, interpreter:AbstractInterpreter):
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self.s = formula_string
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self.__i = interpreter
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if not self.isValid(self.__i):
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assert "formula in invalid!"
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else:
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print("given formula is valid")
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def isValid(self, interpreter)->bool:
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return interpreter.isValid(self)
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i = SimpleInterpreter()
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print(sys.argv)
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if sys.argv[1] == '-f':
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#open from file
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print("opening from file")
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g = open(sys.argv[1], 'r')
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u = g.readlines()
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for l in u:
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Formula(l,i)
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else:
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Formula( sys.argv[1],i)
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