def getPlusSignOperatorStr(previousChar, nextChar):
if (previousChar is None) & sI.isNumber(nextChar):
return "PREFIX_PLUS"
if (previousChar is None) & sI.isOperator(nextChar):
return "PREFIX_PLUS"
elif sI.isNumber(previousChar) | sI.isNumber(nextChar):
return "INFIX_PLUS"
def createAndPushTokenToStack(listIndex, expressionList, operandStack, operatorStack, previousToken):
currentChar = expressionList[listIndex]
if sI.isNumber(currentChar): # formatNumber(number)
token = operandT.createOperandToken(sI.formatNumber(sI.stringToNumber(currentChar)))
st.pushStack(operandStack, token)
elif sI.isOperator(currentChar): # Raise exception when non operator detected
token = operatorT.createOperatorToken(operatorT.getOperatorStrAffix(getCharFromToken(previousToken),
expressionList[listIndex + 1],
currentChar))
st.pushStack(operatorStack, token)
return token
def createToken(listIndex, expressionList, previousToken):
currentChar = expressionList[listIndex]
if sI.isNumber(currentChar): # formatNumber(number)
token = operandT.createOperandToken(sI.formatNumber(sI.stringToNumber(currentChar)))
elif sI.isOperator(currentChar): # Raise exception when non operator detected, required next char to check get
# affix
token = operatorT.createOperatorToken(operatorT.getOperatorStrAffix(getCharFromToken(previousToken),
expressionList[listIndex + 1],
currentChar))
token.tokenId = listIndex
return token
def createOperandToken(operandStr):
if not sI.isNumber(
operandStr): # Verify whether the parameter str is number
# Raise exception if parameter is not number
raise ValueError(
"Error: createOperandToken() received invalid operand str.")
# Convert str to number, then format the numbe (remove decimal if it's int)
token = OperandToken()
token.num = sI.formatNumber(sI.stringToNumber(operandStr))
token.numType = getNumberType(token.num)
token.tokenType = "OPERAND_TOKEN"
return token
def test_c_isNumber_given_symbols_expect_false(self):
# isNumber(expression)
self.assertEqual(False, sI.isNumber("@!@$%"))
def test_b_isNumber_given_12point111111_expect_true(self):
# isNumber(expression)
self.assertEqual(True, sI.isNumber("12.111111"))
def test_a_isNumber_given_1112_expect_true(self):
# isNumber(expression)
self.assertEqual(True, sI.isNumber("1112"))