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 represntation = current.ToString(CultureInfo.InvariantCulture);
var token = new CommandTreeToken(CommandTreeToken.Kind.ShortOption, tokenPosition, represntation, represntation);
throw CommandParseException.InvalidShortOptionName(reader.Original, token);
}
}
if (result.Count > 1)
{
foreach (var item in result)
{
item.IsGrouped = true;
}
}
return(result);
}
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}"));
}
private static CommandTreeToken ScanQuotedString(CommandTreeTokenizerContext context, TextBuffer reader)
{
var position = reader.Position;
context.FlushRemaining();
reader.Consume('\"');
var builder = new StringBuilder();
var terminated = false;
while (!reader.ReachedEnd)
{
var character = reader.Peek();
if (character == '\"')
{
terminated = true;
reader.Read();
break;
}
builder.Append(reader.Read());
}
if (!terminated)
{
var unterminatedQuote = builder.ToString();
var token = new CommandTreeToken(CommandTreeToken.Kind.String, position, unterminatedQuote, $"\"{unterminatedQuote}");
throw CommandParseException.UnterminatedQuote(reader.Original, token);
}
var quotedString = builder.ToString();
// Add to the context
context.AddRemaining(quotedString);
return(new CommandTreeToken(
CommandTreeToken.Kind.String,
position, quotedString,
quotedString));
}
private static int ParseToken(CommandTreeTokenizerContext context, TextBuffer reader, int position, int start, List <CommandTreeToken> tokens)
{
while (reader.Peek() != -1)
{
if (reader.ReachedEnd)
{
position += reader.Position - start;
break;
}
var character = reader.Peek();
// Eat whitespace
if (char.IsWhiteSpace(character))
{
reader.Consume();
continue;
}
if (character == '-')
{
// Option
tokens.AddRange(ScanOptions(context, reader));
}
else
{
// Command or argument
tokens.Add(ScanString(context, reader));
}
// Flush remaining tokens
context.FlushRemaining();
}
return(position);
}