private void CheckIdentifierAfterTrim(string identifier, IdentifierParseOptions options)
{
if (!IsValidIdentifier(identifier, options))
{
throw FormatException(ProjectTreeFormatError.IdExpected_EncounteredOnlyWhiteSpace, "Expected identifier, but encountered only white space.");
}
}
private bool IsValidIdentifier(string identifier, IdentifierParseOptions options)
{
if ((options & IdentifierParseOptions.Required) == IdentifierParseOptions.Required)
{
return(identifier.Length != 0);
}
return(true);
}
public string ReadIdentifier(IdentifierParseOptions options)
{
string identifier = ReadIdentifierCore(options);
CheckIdentifier(identifier, options);
identifier = identifier.TrimEnd((char)TokenType.WhiteSpace);
CheckIdentifierAfterTrim(identifier, options);
return(identifier);
}
private void CheckIdentifier(string identifier, IdentifierParseOptions options)
{
if (IsValidIdentifier(identifier, options))
{
return;
}
// Are we at the end of the string?
Token?token = ReadToken(); // Consume token, so "position" is correct
if (token == null)
{
throw FormatException(ProjectTreeFormatError.IdExpected_EncounteredEndOfString, $"Expected identifier, but encountered end-of-string.");
}
// Otherwise, we must have hit a delimiter as whitespace will have been consumed as part of the identifier
throw FormatException(ProjectTreeFormatError.IdExpected_EncounteredDelimiter, $"Expected identifier, but encountered '{token.Value.Value}'.");
}
private string ReadIdentifierCore(IdentifierParseOptions options)
{
StringBuilder identifier = new StringBuilder();
Token?token;
while ((token = PeekToken()) != null)
{
Token t = token.Value;
if (t.IsDelimiter)
{
break;
}
ReadToken();
identifier.Append(t.Value);
}
return(identifier.ToString());
}
