private string?ParseOptionValue(
CommandTreeParserContext context,
CommandTreeTokenStream stream,
CommandTreeToken token,
CommandTree current,
CommandParameter?parameter)
{
var value = default(string);
// Parse the value of the token (if any).
var valueToken = stream.Peek();
if (valueToken?.TokenKind == CommandTreeToken.Kind.String)
{
var parseValue = true;
if (token.TokenKind == CommandTreeToken.Kind.ShortOption && token.IsGrouped)
{
parseValue = false;
}
if (context.State == State.Normal && parseValue)
{
// Is this a command?
if (current.Command.FindCommand(valueToken.Value, CaseSensitivity) == null)
{
if (parameter != null)
{
if (parameter.ParameterKind == ParameterKind.Flag)
{
if (!CliConstants.AcceptedBooleanValues.Contains(valueToken.Value, StringComparer.OrdinalIgnoreCase))
{
// Flags cannot be assigned a value.
throw CommandParseException.CannotAssignValueToFlag(context.Arguments, token);
}
}
value = stream.Consume(CommandTreeToken.Kind.String)?.Value;
}
else
{
// Unknown parameter value.
value = stream.Consume(CommandTreeToken.Kind.String)?.Value;
// In relaxed parsing mode?
if (context.ParsingMode == ParsingMode.Relaxed)
{
context.AddRemainingArgument(token.Value, value);
}
}
}
}
else
{
context.AddRemainingArgument(token.Value, parseValue ? valueToken.Value : null);
}
}
else
{
if (context.State == State.Remaining || context.ParsingMode == ParsingMode.Relaxed)
{
context.AddRemainingArgument(token.Value, null);
}
}
// No value?
if (context.State == State.Normal)
{
if (value == null && parameter != null)
{
if (parameter.ParameterKind == ParameterKind.Flag)
{
value = "true";
}
else
{
if (parameter is CommandOption option)
{
if (parameter.IsFlagValue())
{
return(null);
}
throw CommandParseException.OptionHasNoValue(context.Arguments, token, option);
}
else
{
// This should not happen at all. If it does, it's because we've added a new
// option type which isn't a CommandOption for some reason.
throw new InvalidOperationException($"Found invalid parameter type '{parameter.GetType().FullName}'.");
}
}
}
}
return(value);
}
