/// <summary>
/// Finds referred symbol in grammar and tokenizer
/// </summary>
/// <param name="grammar"></param>
/// <param name="lexer"></param>
public void CreateReference(Productions grammar, Lexer lexer)
{
object referredTo;
if ((referredTo = grammar.GetRule(Symbol)) != null)
{
RefersTo = new RuleReference((Rule)referredTo, this);
}
else if ((referredTo = lexer.FindTokenType(Symbol)) != null)
{
RefersTo = new TokenReference((TokenType)referredTo, this);
}
if (RefersTo == null)
{
throw Exceptions.UnresolvedReferenceException(this);
}
}