private void ParseUnary()
{
// We only have '+' and '-' as unary operators so we don't need to check precedence and pop from stack
if (OperatorHelper.HasUnary(tokenizer.Token))
{
operators.Push(tokenizer.Token);
}
}
private void ParseNumber()
{
output.Enqueue(new TokenNumber(tokenizer.Number));
// Need to enqueue unary operators after a number
while (operators.Count != 0 && OperatorHelper.HasUnary(operators.Peek()))
{
EnqueueOperator();
}
}
void OnCalculate(object sender, EventArgs e) //This method is called when we have both first number and second number and we are going to evaluate those number
{
if (currentState == 2)
{
var result = OperatorHelper.Calculate(firstNumber, secondNumber, myoperator);
this.resultText.Text = result.ToString();
firstNumber = result;
currentState = -1;
}
}
private void ParseBinary()
{
if (OperatorHelper.HasBinary(tokenizer.Token))
{
int currentPrecedence = precedence[tokenizer.Token];
while (operators.Count != 0 && currentPrecedence <= precedence[operators.Peek()])
{
EnqueueOperator();
}
operators.Push(tokenizer.Token);
}
}
private void ParseCloseParenthesis()
{
// If there is no '(' on the stack we get an exception
try {
while (operators.Peek() != TokenType.OpenParenthesis)
{
EnqueueOperator();
}
}
catch (InvalidOperationException) {
throw new SyntaxException("Missing open parenthesis");
}
operators.Pop(); // Pop '('
// Need to enqueue unary operators after a pair of parenthesis
while (operators.Count != 0 && OperatorHelper.HasUnary(operators.Peek()))
{
EnqueueOperator();
}
}
private void EnqueueOperator() => output.Enqueue(OperatorHelper.GetOperator(operators.Pop()));