public DisambigCommandHandler(
Actor Actor,
CommandParser.MatchedCommand MatchedCommand,
ParserCommandHandler ParentHandler)
{
this.ParentHandler = ParentHandler;
this.MatchedCommand = MatchedCommand;
// Find an object parameter such that
// a) each match has a parameter with that name
// b) at least one match has a value different from the others
var foundAmbiguousArgument = false;
// Note that we iterate only over the arguments in the first match. If the first match doesn't have the
// argument, that argument can't satisfy condition a above.
foreach (var argument in MatchedCommand.Matches[0])
{
// It's only possible to disambiguate on MudObjects. If any match - including the first one - has
// a value for that argument that is not a MudObject, disambiguation will fail.
if (argument.Value is MudObject)
{
var uniqueMatchables = new List <MudObject>();
var rejected = false;
foreach (var match in MatchedCommand.Matches)
{
if (match.ContainsKey(argument.Key) &&
match[argument.Key] is MudObject)
{
var matchableObject = match[argument.Key] as MudObject;
if (!uniqueMatchables.Contains(matchableObject))
{
uniqueMatchables.Add(matchableObject);
}
}
else
{
rejected = true;
break;
}
}
if (!rejected && uniqueMatchables.Count > 1)
{
// Disambiguate on this object.
DisambigArgument = argument.Key;
DisambigObjects = uniqueMatchables;
foundAmbiguousArgument = true;
break;
}
}
}
if (foundAmbiguousArgument)
{
var response = new StringBuilder();
response.Append("Which did you mean?\r\n");
for (var i = 0; i < DisambigObjects.Count; ++i)
{
response.Append(String.Format("{0}: {1}\r\n", i, Core.GlobalRules.ConsiderValueRule <String>("printed name", Actor, DisambigObjects[i], "the")));
}
MudObject.SendMessage(Actor, response.ToString());
}
else
{
MudObject.SendMessage(Actor, "I couldn't figure out how to disambiguate that command.");
}
}
public MatchedCommand ParseCommand(PendingCommand Command)
{
var tokens = new LinkedList <String>(Command.RawCommand.Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries));
var rootMatch = new PossibleMatch(tokens.First);
rootMatch.Upsert("ACTOR", Command.Actor);
rootMatch.Upsert("LOCATION", Command.Actor == null ? null : Command.Actor.Location);
// A pending command can have some properties set when it is queued. For example, the 'go' action
// generates a 'look' command after processing. It will give the 'look' command a property named
// 'auto' to indicate that the look command was generated. Rules can then use this property to
// implement behavior. From the same example, 'look' may emit a brief description if it is generated
// by the 'go' action, but emit a more detailed description if the player enters the command 'look'.
// See StandardActions.Go
if (Command.PreSettings != null)
{
foreach (var setting in Command.PreSettings)
{
rootMatch.Upsert(setting.Key.ToUpper(), setting.Value);
}
}
var matchContext = new MatchContext {
ExecutingActor = Command.Actor
};
// Try every single command defined, until one matches.
foreach (var command in Commands)
{
IEnumerable <PossibleMatch> matches;
try
{
matches = command.Matcher.Match(rootMatch, matchContext);
}
catch (MatchAborted ma)
{
// The match didn't fail; it generated an error. These means the match progressed to a point
// where the author of the command felt that the input could not logically match any other
// command, however, the input was still malformed in some way. Abort matching, and dummy up
// a command entry to display the error message to the player.
return(new MatchedCommand(
new CommandEntry().ProceduralRule((match, actor) =>
{
MudObject.SendMessage(actor, ma.Message);
return PerformResult.Continue;
}),
// We need a fake match just so it can be passed to the procedural rule.
new PossibleMatch[] { new PossibleMatch(null) }));
}
// Only accept matches that consumed all of the input.
matches = matches.Where(m => m.Next == null);
// If we did consume all of the input, we will assume this match is successful. Note it is
// possible for a command to generate multiple matches, but not possible to match multiple commands.
if (matches.Count() > 0)
{
return(new MatchedCommand(command, matches));
}
}
return(null);
}
