// Methods/Functions
public void AddDigit(string digit)
{
char chngSignChar = (char)0x00B1; // the +/- symbol
if (digit.Length != 1)
{
return;
}
if (char.IsDigit(digit, 0) || (digit == "." && !BufferHasDecimalPoint()))
{
if (BufferIsEmpty() && !XRegisterIsPlaceholder)
{
ParentStack.Push(0);
}
XRegisterIsPlaceholder = false;
if (BufferIsEmpty() && digit == ".")
{
NewEntryBuffer = "0";
}
NewEntryBuffer += digit;
ValueInX = double.Parse(NewEntryBuffer);
}
else if (digit.CompareTo(chngSignChar.ToString()) == 0)
{
ValueInX *= -1;
if (NewEntryBuffer.Length > 0)
{
if (ValueInX < 0)
{
if (NewEntryBuffer.Substring(0, 1) != "-")
{
NewEntryBuffer = "-" + NewEntryBuffer;
}
}
else if (ValueInX > 0)
{
if (NewEntryBuffer.Substring(0, 1) == "-")
{
NewEntryBuffer = NewEntryBuffer.Substring(1);
}
}
}
}
}
/// <summary>
/// Controls the downgrade with multiple Pop() and insert a new parent to the tree.
/// </summary>
/// <param name="line"></param>
private void SetDowngradeLevel(string line)
{
WriteChild(line);
ParentStack.Push(line);
}
public void PushBufferUpTheStack()
{
ParentStack.Push(ValueInX);
ClearBuffer();
}
private void SetSameLevel(string line)
{
ParentStack.Pop();
WriteChild(line);
ParentStack.Push(line);
}