private CommandTree ParseCommandParameters(
CommandTreeParserContext context,
CommandInfo command,
CommandTree parent,
CommandTreeTokenStream stream)
{
context.ResetArgumentPosition();
var node = new CommandTree(parent, command);
while (stream.Peek() != null)
{
var token = stream.Peek();
switch (token.TokenKind)
{
case CommandTreeToken.Kind.LongOption:
// Long option
ParseOption(context, stream, token, node, true);
break;
case CommandTreeToken.Kind.ShortOption:
// Short option
ParseOption(context, stream, token, node, false);
break;
case CommandTreeToken.Kind.String:
// Command
ParseString(context, stream, node);
break;
case CommandTreeToken.Kind.Remaining:
// Remaining
stream.Consume(CommandTreeToken.Kind.Remaining);
context.State = State.Remaining;
break;
default:
throw new InvalidOperationException($"Encountered unknown token ({token.TokenKind}).");
}
}
// Add unmapped parameters.
foreach (var parameter in node.Command.Parameters)
{
if (node.Mapped.All(m => m.Parameter != parameter))
{
node.Unmapped.Add(parameter);
}
}
return(node);
}
private static string ParseOptionValue(
CommandTreeParserContext context,
CommandTreeTokenStream stream,
CommandTreeToken token,
CommandTree current,
CommandParameter parameter)
{
var value = (string)null;
// 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) == null)
{
if (parameter != null)
{
if (parameter.ParameterKind == ParameterKind.Single)
{
value = stream.Consume(CommandTreeToken.Kind.String).Value;
}
else if (parameter.ParameterKind == ParameterKind.Flag)
{
// Flags cannot be assigned a value.
throw ParseException.CannotAssignValueToFlag(context.Arguments, token);
}
}
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
{
switch (parameter)
{
case CommandOption option:
throw ParseException.OptionHasNoValue(context.Arguments, token, option);
default:
// 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);
}