private CommandArgumentNode?ParseCommandArgument(CommandNode commandNode)
{
if (CurrentToken.Type != TokenType.Argument)
{
return(null);
}
IArgument?argument = default;
for (var i = 0; i < commandNode.Command.Arguments.Count; i++)
{
if (commandNode.Command.Arguments[i] is {} arg&&
!IsFull(arg))
{
argument = arg;
break;
}
}
if (argument is null)
{
return(null);
}
var argumentNode = new CommandArgumentNode(
CurrentToken,
argument,
commandNode);
IncrementCount(argument);
Advance();
return(argumentNode);
}
private CommandArgumentNode ParseCommandArgument(CommandNode commandNode)
{
if (CurrentToken.Type != TokenType.Argument)
{
return(null);
}
var argument = commandNode.Command
.Arguments
.FirstOrDefault(a => !IsFull(a));
if (argument == null)
{
return(null);
}
var argumentNode = new CommandArgumentNode(
CurrentToken,
argument,
commandNode);
IncrementCount(argument);
Advance();
return(argumentNode);
}
private void ParseCommandChildren(CommandNode parent)
{
while (More())
{
if (CurrentToken.Type == TokenType.EndOfArguments)
{
return;
}
var child =
ParseSubcommand(parent)
?? (SyntaxNode?)ParseOption(parent)
?? ParseCommandArgument(parent);
if (child is null)
{
UnmatchedTokens.Add(CurrentToken);
Advance();
}
else
{
parent.AddChildNode(child);
}
}
}
protected override void VisitCommandNode(CommandNode commandNode)
{
var commandResult = new CommandResult(
commandNode.Command,
commandNode.Token,
_innermostCommandResult
);
_innermostCommandResult !.Children.Add(commandResult);
_innermostCommandResult = commandResult;
}
private CommandNode?ParseSubcommand(CommandNode parentNode)
{
if (CurrentToken.Type != TokenType.Command)
{
return(null);
}
if (parentNode.Command.Children.GetByAlias(CurrentToken.Value) is ICommand command)
{
var commandNode = new CommandNode(CurrentToken, command, parentNode);
Advance();
ParseCommandChildren(commandNode);
return(commandNode);
}
return(null);
}
private OptionNode?ParseOption(CommandNode parent)
{
if (CurrentToken.Type != TokenType.Option)
{
return(null);
}
OptionNode?optionNode = null;
if (parent.Command.Children.GetByAlias(CurrentToken.Value) is IOption option)
{
optionNode = new OptionNode(CurrentToken, option, parent);
Advance();
ParseOptionArguments(optionNode);
}
return(optionNode);
}
