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51 lines
1.4 KiB

import re
class Token:
NUMBER = 0
OPERATOR = 1
PARENTHESE = 2
FUNCTION = 3
@staticmethod
def isNumber(n):
return re.match(r'\d+', str(n)) is not None
@staticmethod
def getPrecedence(tok):
if tok == "(" or tok == "":
return 4
elif tok == "*" or tok == "/":
return 3
elif tok == "+" or tok == "-":
return 2
def __init__(self, type, val):
self.type = type
self.val = val
class Expression:
def __init__(self, val=None, gauche=None, droite=None):
if Token.isNumber(val) and (gauche != None or droite != None):
raise AttributeError("gauche et droite ne peuvent pas exister si val est un nombre")
self.val = val
self.gauche = gauche
self.droite = droite
def evalue(self):
if self.val == "+":
return self.gauche.evalue() + self.droite.evalue()
elif self.val == "-":
return self.gauche.evalue() - self.droite.evalue()
elif self.val == "*":
return self.gauche.evalue() * self.droite.evalue()
elif self.val == "/":
return self.gauche.evalue() / self.droite.evalue()
else:
return float(self.val)
def __str__(self):
if Token.isNumber(self.val):
return str(self.val)
return "(" + str(self.gauche.__str__()) + str(self.val) + str(self.droite.__str__()) + ")"