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main.py
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main.py
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def calculating(cal):
value = cal[0]
i = 1
while len(cal) > i+1:
if cal[i] == '+':
i += 1
if cal[i] == '+' or cal[i] == '-':
print("Syntax Error ; Double operator")
exit(0)
value += cal[i]
elif cal[i] == '-':
i += 1
if cal[i] == '+' or cal[i] == '-':
print("Syntax Error ; Double operator")
exit(0)
value -= cal[i]
i += 1
cal.clear()
return value
def lexer(code):
stack = []
cal = []
i = 0
n = 0
isN = False
while len(code) > i:
if code[i] == ';':
if isN:
cal.append(n)
n = 0
isN = False
stack.append(calculating(cal))
elif code[i] == ':':
if len(stack) == 0:
print("Error ; Stack is Empty")
exit(0)
else:
im = stack[len(stack)-1]
if isN:
cal.append(str(n)+im)
n = 0
isN = False
else:
cal.append(im)
elif code[i] == '.':
if isN:
cal.append(n)
n = 0
isN = False
if len(stack) == 0:
print("Error ; Stack is Empty")
exit(0)
else:
stack.pop()
elif code[i] == '+':
if isN:
cal.append(n)
n = 0
isN = False
cal.append('+')
elif code[i] == '-':
if isN:
cal.append(n)
n = 0
isN = False
cal.append('-')
elif code[i] == '!':
if isN:
cal.append(n)
n = 0
isN = False
print(calculating(cal))
elif code[i] >= '0' and code[i] <= '9':
n = n*10 + int(code[i])
isN = True
i += 1
lexer("20;10;:.+:+10+10+10!")
lexer("")