public void AddExpression(string name, string regex)
{
using (var stream = new StringReader(InfixToPostfix.Convert(regex)))
{
while (stream.Peek() != -1)
{
var c = (char)stream.Read();
switch (c)
{
case '.': _stack.Concatenate(); break;
case '|': _stack.Unite(); break;
case '*': _stack.Iterate(); break;
case '+': _stack.AtLeast(); break;
case '?': _stack.Maybe(); break;
default:
var a = new NFA <char>();
a.AddTransition(a.Start, new State(), c == '\\' ? Escape((char)stream.Read()) : c);
_stack.Push(a);
break;
}
}
var top = _stack.Peek();
top.LastAdded.Final = true;
top.SetName(top.LastAdded, name);
}
}
