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Aritmetica.py
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Aritmetica.py
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from automata import *
from scanner import *
#keywords
keywords =['while', 'do', 'if', 'switch']
#character
letter = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
letter = character(letter)
digit = "0123456789"
digit = character(digit)
tab = chr(9)
tab = character(tab)
eol = chr(10)
eol = character(eol)
#tokens
ident=letter+" (("+letter+"|"+digit+")*)"
number=digit+" (("+digit+")*)"
automata_keyword=[ident]
automata =[number]
charss =[ chr(9), chr(10)]
scanner(keywords, automata , automata_keyword, charss)
def Expr():
while(True):
Stat ("")
get(".")
return result
def Stat ():
value = 0
value = input()
value = Factor(value)
return result
def Expression( result):
result1 = 0
result2 = 0
result1 = Term(result1)
while(follow() == '+' or follow() == '-'):
if(follow()=='+'):
result2=Term(result2)
result1+=result2
elif(follow()=='-'):
result2=Term(result2)
result1-=result2
result=result1
return result
def Term( result):
result1 = 0
result2 = 0
result1 = Factor(result1)
while(follow() == '*' or follow() == '/'):
if(follow()=='*'):
result2=Factor(result2)
result1*=result2
elif(follow()=='/'):
result2=Factor(result2)
result1/=result2
result=result1
return result
def Factor( result):
signo=1
if follow() =="-":
signo = -1
## "("Expression( result)")")
result*=signo
return result
def Number( result):
result = int(value)
return result