private bool TryParseTerm(ITokenStream tokens, out Expression?term)
{
if (TermParser == null)
{
throw new ArgumentNullException("Term parser must be set before parsing");
}
term = TermParser.Parse(tokens);
if (term == null)
{
tokens.Reset();
return(false);
}
else
{
tokens.ForgetPreceding();
return(true);
}
}