private void TabPreprocess_Enter(object sender, EventArgs e)
{
listBoxFirst.Items.Clear();
listBoxFollow.Items.Clear();
if (_grammarRules == null)
{
MessageBox.Show("Grammar File is empty");
return;
}
_preprocessor = new Preprocessor(_grammarRules);
RestartStopWatch();
_preprocessor.CalculateAllFirsts();
_preprocessor.CalculateAllFollows();
_stopwatch.Stop();
lblTime.Text = $"First and follow calculation took {_stopwatch.ElapsedMilliseconds} ms.";
foreach (ISymbol symbol in _grammarRules.SymbolList)
{
if (symbol is Variable variable)
{
listBoxFirst.Items.Add(variable.ShowFirsts());
listBoxFollow.Items.Add(variable.ShowFollows());
}
}
}