private void ParseOption(
CommandTreeParserContext context,
CommandTreeTokenStream stream,
CommandTreeToken token,
CommandTree node,
bool isLongOption)
{
// Consume the option token.
stream.Consume(isLongOption ? CommandTreeToken.Kind.LongOption : CommandTreeToken.Kind.ShortOption);
if (context.State == State.Normal)
{
// Find the option.
var option = node.FindOption(token.Value, isLongOption);
if (option != null)
{
node.Mapped.Add(new MappedCommandParameter(
option, ParseOptionValue(context, stream, token, node, option)));
return;
}
// Help?
if (_help?.IsMatch(token.Value) == true)
{
node.ShowHelp = true;
return;
}
}
if (context.State == State.Remaining)
{
ParseOptionValue(context, stream, token, node, null);
return;
}
if (context.ParsingMode == ParsingMode.Strict)
{
throw ParseException.UnknownOption(context.Arguments, token);
}
else
{
ParseOptionValue(context, stream, token, node, null);
}
}
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);
}
private void ParseString(
CommandTreeParserContext context,
CommandTreeTokenStream stream,
CommandTree node)
{
if (context.State == State.Remaining)
{
stream.Consume(CommandTreeToken.Kind.String);
return;
}
var token = stream.Expect(CommandTreeToken.Kind.String);
// Command?
var command = node.Command.FindCommand(token.Value);
if (command != null)
{
if (context.State == State.Normal)
{
node.Next = ParseCommand(context, node.Command, node, stream);
}
return;
}
// Current command has no arguments?
if (!node.HasArguments())
{
throw ParseException.UnknownCommand(_configuration, node, context.Arguments, token);
}
// Argument?
var parameter = node.FindArgument(context.CurrentArgumentPosition);
if (parameter == null)
{
// No parameters left. Any commands after this?
if (node.Command.Children.Count > 0 || node.Command.IsDefaultCommand)
{
throw ParseException.UnknownCommand(_configuration, node, context.Arguments, token);
}
throw ParseException.CouldNotMatchArgument(context.Arguments, token);
}
// Yes, this was an argument.
if (parameter.ParameterKind == ParameterKind.Vector)
{
// Vector
var current = stream.Current;
var aggregator = new List <string>(); // TODO: Allocations
while (current?.TokenKind == CommandTreeToken.Kind.String)
{
var value = stream.Consume(CommandTreeToken.Kind.String).Value;
node.Mapped.Add(new MappedCommandParameter(parameter, value));
current = stream.Current;
}
}
else
{
// Scalar
var value = stream.Consume(CommandTreeToken.Kind.String).Value;
node.Mapped.Add(new MappedCommandParameter(parameter, value));
context.IncreaseArgumentPosition();
}
}