private static IEnumerable <CommandTreeToken> ScanShortOptions(CommandTreeTokenizerContext context, TextBuffer reader, int position)
{
var result = new List <CommandTreeToken>();
while (!reader.ReachedEnd)
{
var current = reader.Peek();
if (char.IsWhiteSpace(current))
{
break;
}
// Encountered a separator?
if (current == '=' || current == ':')
{
break;
}
if (char.IsLetter(current))
{
context.AddRemaining(current);
reader.Read(); // Consume
var value = current.ToString(CultureInfo.InvariantCulture);
result.Add(result.Count == 0
? new CommandTreeToken(CommandTreeToken.Kind.ShortOption, position, value, $"-{value}")
: new CommandTreeToken(CommandTreeToken.Kind.ShortOption, position + result.Count, value, value));
}
else
{
// Create a token representing the short option.
var tokenPosition = position + 1 + result.Count;
var token = new CommandTreeToken(CommandTreeToken.Kind.ShortOption, tokenPosition, current.ToString(), current.ToString());
throw ParseException.InvalidShortOptionName(reader.Original, token);
}
}
if (result.Count > 1)
{
foreach (var item in result)
{
item.IsGrouped = true;
}
}
return(result);
}
public static (CommandTreeTokenStream, IReadOnlyList <string>) Tokenize(IEnumerable <string> args)
{
var tokens = new List <CommandTreeToken>();
var position = 0;
var previousReader = default(TextBuffer);
var context = new CommandTreeTokenizerContext();
foreach (var arg in args)
{
var start = position;
var reader = new TextBuffer(previousReader, arg);
// Parse the token.
position = ParseToken(context, reader, position, start, tokens);
context.FlushRemaining();
previousReader = reader;
}
return(new CommandTreeTokenStream(tokens), context.Remaining);
}
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 ParseException.LongOptionNameIsMissing(reader, position);
}
if (name.Value.Length == 1)
{
throw ParseException.LongOptionNameIsOneCharacter(reader, position, name.Value);
}
if (char.IsDigit(name.Value[0]))
{
throw ParseException.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 ParseException.LongOptionNameContainSymbol(reader, position + 2 + index, name.Value[index]);
}
}
return(new CommandTreeToken(CommandTreeToken.Kind.LongOption, position, name.Value, $"--{name.Value}"));
}