private void CheckAlias(string alias, Terminal terminal, LexSpan span)
{
//
// Terminal already known in collection
//
String format = null;
String oldAlias = terminal.Alias;
if (oldAlias == null)
{
format = "Token {0} already declared, without alias {1}";
terminal.AddAlias(alias);
}
else if (oldAlias.Equals(alias))
{
format = "Token {0} already declared, with same alias {1}";
}
else
{
format = "Declaring an additional alias, {1}, for token {0}";
}
handler.AddWarning(153,
String.Format(CultureInfo.InvariantCulture, format,
terminal.BaseString(), alias),
span);
aliasTerms[alias] = terminal;
}
private void CheckAndSetAlias(string alias, Terminal terminal, LexSpan span)
{
//
// Check if this alias already known.
//
if (aliasTerms.ContainsKey(alias))
{
//
// If an alias denotes more than one logical token then used
// occurrences of the literal string alias must be disallowed.
//
Terminal other = aliasTerms[alias];
if (other != terminal)
{
handler.AddWarning(153,
String.Format(CultureInfo.InvariantCulture,
"Alias \"{0}\" also used for previous token: {1}, used occurrences forbidden",
alias, other.BaseString()), span);
aliasTerms[alias] = Terminal.Ambiguous;
}
}
else
{
aliasTerms[alias] = terminal;
}
}