private List <string> ParseDottedExpression(TypeNameTerminal terminal)
{
var result = new List <string>();
while (true)
{
var nextIdentifier = TryExpect(terminal);
if (!nextIdentifier.HasValue)
{
break;
}
result.Add(nextIdentifier.Value.Text);
if (!TryExpect(TypeNameTerminal.Dot).HasValue)
{
break;
}
}
if (result.Count == 0)
{
throw new FormatException($"Expected {string.Join(", ",terminal)}.");
}
return(result);
}
private TypeNameToken?TryExpect(TypeNameTerminal terminal)
{
var token = _lexer.Peek();
if (terminal != token.Terminal)
{
return(null);
}
_lexer.Next();
return(token);
}
private TypeNameToken Expect(TypeNameTerminal terminal)
{
return(TryExpect(terminal)
?? throw new FormatException($"Expected {terminal}."));
}
public TypeNameToken(TypeNameTerminal terminal, string text)
{
Terminal = terminal;
Text = text;
}
