public Task <AppUser?> TryGetByName([FromRoute] string name, CancellationToken cancellationToken = default)
{
name = HttpUtility.UrlDecode(name);
return(AppUsers.TryGetByName(name, cancellationToken));
}
public virtual async Task <GameMessage> Parse(string text, CancellationToken cancellationToken = default)
{
List <MessageFragment> fragments = new();
var startIndex = 0;
void AddPlainText(int length)
{
if (length < 0)
{
startIndex -= length;
}
fragments.Add(new PlainText(text.Substring(startIndex, length)));
startIndex += length;
}
bool StartsWith(string start) => text.AsSpan(startIndex).StartsWith(start);
bool TryParseDirective(string directive, out string value)
{
value = "";
if (!StartsWith(directive))
{
return(false);
}
if (startIndex + directive.Length + 2 >= text.Length || text[startIndex + directive.Length] != '[')
{
AddPlainText(directive.Length);
return(false);
}
var valueStartIndex = startIndex + directive.Length + 1;
var rightBracketIndex = text.IndexOf(']', valueStartIndex);
if (rightBracketIndex < 0)
{
AddPlainText(directive.Length);
return(false);
}
value = text.Substring(valueStartIndex, rightBracketIndex - valueStartIndex);
startIndex = rightBracketIndex + 1;
return(true);
}
while (startIndex < text.Length)
{
if (text[startIndex] != '@')
{
var endIndex = text.IndexOf('@', startIndex);
if (endIndex < 0)
{
endIndex = text.Length;
}
AddPlainText(endIndex - startIndex);
continue;
}
if (StartsWith("@@"))
{
fragments.Add(new PlainText("@"));
startIndex += 2;
continue;
}
var directiveStartIndex = startIndex;
if (TryParseDirective("@user", out var userIdText))
{
if (!long.TryParse(userIdText, out var userId))
{
AddPlainText(directiveStartIndex - startIndex);
continue;
}
var user = await AppUsers.TryGet(userId, cancellationToken);
if (user == null)
{
AddPlainText(directiveStartIndex - startIndex);
continue;
}
fragments.Add(new UserMention(user));
continue;
}
if (TryParseDirective("@score", out var scoreText))
{
var scoreParts = scoreText.Split(",");
if (scoreParts.Length != 2)
{
AddPlainText(directiveStartIndex - startIndex);
continue;
}
var gameId = scoreParts[0].Trim();
if (string.IsNullOrEmpty(gameId))
{
AddPlainText(directiveStartIndex - startIndex);
continue;
}
if (!long.TryParse(scoreParts[1].Trim(), out var score))
{
AddPlainText(directiveStartIndex - startIndex);
continue;
}
var game = await Games.TryGet(gameId, cancellationToken);
if (game == null)
{
AddPlainText(directiveStartIndex - startIndex);
continue;
}
fragments.Add(new GameScoreMention(game, score));
continue;
}
if (StartsWith("@"))
{
var name = UserNameService.ParseName(text, startIndex + 1);
if (string.IsNullOrEmpty(name))
{
AddPlainText(1);
continue;
}
var user = await AppUsers.TryGetByName(name, cancellationToken);
if (user == null)
{
AddPlainText(name.Length + 1);
continue;
}
fragments.Add(new UserMention(user));
startIndex += name.Length + 1;
continue;
}
}
List <MessageFragment> optimizedFragments = new();
MessageFragment? lastFragment = null;
foreach (var fragment in fragments)
{
if (fragment is PlainText pt && lastFragment is PlainText lpt)
{
lastFragment = new PlainText(lpt.Text + pt.Text);
optimizedFragments.RemoveAt(optimizedFragments.Count - 1);
}