def evaluate(self):
while self._scanner.hasNext():
currentToken = self._scanner.next()
self._expressionSoFar += str(currentToken) + " "
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
if len(self._operandStack) < 2:
raise Exception, \
"Too few operands on the stack"
t2 = self._operandStack.pop()
t1 = self._operandStack.pop()
result = Token(self._computeValue(currentToken,
t1.getValue(),
t2.getValue()))
self._operandStack.push(result)
else:
raise Exception, "Unknown token type"
if len(self._operandStack) > 1:
raise Exception, "Too many operands on the stack"
result = self._operandStack.pop()
return result.getValue();
def evaluate(self):
while self._scanner.hasNext():
currentToken = self._scanner.next()
self._expressionSoFar += str(currentToken) + " "
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
if len(self._operandStack) < 2:
raise Exception, \
"Too few operands on the stack"
t2 = self._operandStack.pop()
t1 = self._operandStack.pop()
result = Token(
self._computeValue(currentToken, t1.getValue(),
t2.getValue()))
self._operandStack.push(result)
else:
raise Exception, "Unknown token type"
if len(self._operandStack) > 1:
raise Exception, "Too many operands on the stack"
result = self._operandStack.pop()
return result.getValue()
