public static Game Parse(string source)
{
var jsonGame = JsonConvert.DeserializeObject <JObject>(source);
var places = new Dictionary <string, GamePlace>();
foreach (var jsonPlace in GetObject(jsonGame, "places")?.Properties() ?? Enumerable.Empty <JProperty>())
{
// get id and description for place
var id = jsonPlace.Name;
var description = GetString(jsonPlace.Value, "description");
var instructions = GetString(jsonPlace.Value, "instructions");
bool.TryParse(GetString(jsonPlace.Value, "finished") ?? "false", out bool finished);
// parse player choices
var choices = new Dictionary <GameCommandType, IEnumerable <KeyValuePair <GameActionType, string> > >();
foreach (var jsonChoice in GetObject(jsonPlace.Value, "choices")?.Properties() ?? Enumerable.Empty <JProperty>())
{
// parse choice command
var choice = (string)jsonChoice.Name;
if (!Enum.TryParse(choice, true, out GameCommandType command))
{
throw new GameLoaderException($"Illegal value for choice ({choice}) at {jsonChoice.Path}.");
}
if (jsonChoice.Value is JArray array)
{
var actions = array.Select(item => {
var property = ((JObject)item).Properties().First();
if (!Enum.TryParse(property.Name, true, out GameActionType action))
{
throw new GameLoaderException($"Illegal key for action ({property.Name}) at {property.Path}.");
}
return(new KeyValuePair <GameActionType, string>(action, (string)property.Value));
}).ToArray();
choices[command] = actions;
}
else
{
throw new GameLoaderException($"Expected object at {jsonChoice.Value.Path} but found {jsonChoice.Value?.Type.ToString() ?? "null"} instead.");
}
}
var place = new GamePlace(id, description, instructions, finished, choices);
places[place.Id] = place;
}
// ensure there is a start room
if (!places.ContainsKey(Game.StartPlaceId))
{
places[Game.StartPlaceId] = new GamePlace(
Game.StartPlaceId,
"No start place is defined for this adventure. Please check your adventure file and try again.",
"Please check your adventure file and try again.",
false,
new Dictionary <GameCommandType, IEnumerable <KeyValuePair <GameActionType, string> > >()
);
}
return(new Game(places));
// helper functions
JObject GetObject(JToken json, string key)
{
if (json is JObject objOuter)
{
var token = objOuter[key];
if (token == null)
{
return(null);
}
if (token is JObject objInner)
{
return(objInner);
}
throw new GameLoaderException($"Expected object at {json.Path}.{key} but found {token?.Type.ToString() ?? "null"} instead.");
}
else
{
throw new GameLoaderException($"Expected object at {json.Path} but found {json?.Type.ToString() ?? "null"} instead.");
}
}
string GetString(JToken token, string key, bool required = true)
{
if (token is JObject obj)
{
var value = obj[key];
try {
return((string)value);
} catch {
throw new GameLoaderException($"Expected string at {token.Path}.{key} but found {token?.Type.ToString().ToLower() ?? "null"} instead.");
}
}
else if (required)
{
throw new GameLoaderException($"Expected string at {token.Path} but found {token?.Type.ToString().ToLower() ?? "null"} instead.");
}
return(null);
}
}
//--- Methods ---
public IEnumerable <AGameResponse> Do(GamePlayer player, GameCommandType command)
{
var result = new List <AGameResponse>();
// some commands are optional and don't require to be defined for a place
var optional = false;
switch (command)
{
case GameCommandType.Describe:
case GameCommandType.Help:
case GameCommandType.Hint:
case GameCommandType.Restart:
case GameCommandType.Quit:
optional = true;
break;
}
// check if the place has associated actions for the choice
GamePlace place = Places[player.PlaceId];
if (place.Choices.TryGetValue(command, out IEnumerable <KeyValuePair <GameActionType, string> > choice))
{
foreach (var action in choice)
{
switch (action.Key)
{
case GameActionType.Goto:
if (!Places.TryGetValue(action.Value, out place))
{
throw new GameException($"Cannot find place: '{action.Value}'");
}
if (player.PlaceId != place.Id)
{
player.PlaceId = place.Id;
DescribePlace(place);
// check if the current place marks the end of the adventure
if (place.Finished)
{
result.Add(new GameResponseFinished());
}
}
break;
case GameActionType.Say:
result.Add(new GameResponseSay(action.Value));
break;
case GameActionType.Pause:
if (!double.TryParse(action.Value, out double delayValue))
{
throw new GameException($"Delay must be a number: '{action.Value}'");
}
result.Add(new GameResponseDelay(TimeSpan.FromSeconds(delayValue)));
break;
case GameActionType.Play:
result.Add(new GameResponsePlay(action.Value));
break;
}
}
}
else if (!optional)
{
result.Add(new GameResponseNotUnderstood());
}
switch (command)
{
case GameCommandType.Describe:
DescribePlace(place);
break;
case GameCommandType.Help:
result.Add(new GameResponseSay(place.Instructions));
break;
case GameCommandType.Hint:
// hints are optional; nothing else to do by default
break;
case GameCommandType.Restart:
if ((choice == null) || !choice.Any(c => c.Key == GameActionType.Goto))
{
place = Places[Game.StartPlaceId];
player.PlaceId = place.Id;
}
DescribePlace(place);
break;
case GameCommandType.Quit:
result.Add(new GameResponseBye());
break;
}
return(result);
// helper functions
void DescribePlace(GamePlace current)
{
if ((current.Description != null) && (current.Instructions != null))
{
result.Add(new GameResponseSay(current.Description));
result.Add(new GameResponseSay(current.Instructions));
}
else if (current.Description != null)
{
result.Add(new GameResponseSay(current.Description));
}
else if (current.Instructions != null)
{
result.Add(new GameResponseSay(current.Instructions));
}
}
}
