internal static Token Synchronize(HashSet<TokenType> types, Scanner scanner, MessageProducer mp)
{
Token tok = scanner.CurrentToken;
// if the current token is not in the synchronization set
// then it is unexpected and the parser must recover.
if (!types.Contains(tok.TokenType))
{
// flag the unexpected token
ErrorHandler.Flag(tok, ErrorCode.UNEXPECTED_TOKEN, mp);
// recover by skipping tokens that are not in
// the synchronization set.
do
{
tok = scanner.GetNextToken();
} while (!tok.IsEof && !types.Contains(tok.TokenType));
}
return tok;
}
