private static CommandTreeToken ScanLongOption(CommandTreeTokenizerContext context, TextBuffer reader, int position)
{
reader.Consume('-');
context.AddRemaining('-');
if (reader.ReachedEnd)
{
// Rest of the arguments are remaining ones.
context.Mode = Mode.Remaining;
return(new CommandTreeToken(CommandTreeToken.Kind.Remaining, position, "--", "--"));
}
var name = ScanString(context, reader, new[] { '=', ':' });
// Perform validation of the name.
if (name.Value.Length == 0)
{
throw CommandParseException.LongOptionNameIsMissing(reader, position);
}
if (name.Value.Length == 1)
{
throw CommandParseException.LongOptionNameIsOneCharacter(reader, position, name.Value);
}
if (char.IsDigit(name.Value[0]))
{
throw CommandParseException.LongOptionNameStartWithDigit(reader, position, name.Value);
}
for (var index = 0; index < name.Value.Length; index++)
{
if (!char.IsLetterOrDigit(name.Value[index]) && name.Value[index] != '-' && name.Value[index] != '_')
{
throw CommandParseException.LongOptionNameContainSymbol(reader, position + 2 + index, name.Value[index]);
}
}
return(new CommandTreeToken(CommandTreeToken.Kind.LongOption, position, name.Value, $"--{name.Value}"));
}
