/// <summary>
/// Updates local data about grammar with id.
/// </summary>
/// <param name="grammarId">Id of grammar that should updated.</param>
/// <returns>
/// When resolved, an updated <see cref="Grammar" /> object. When rejected, an
/// <see cref="Exception" /> with info about error that occured.
/// </returns>
public static IPromise <Grammar> GetGrammar(string grammarId)
{
if (!GrammarList.ContainsKey(grammarId))
{
return(Promise <Grammar> .Rejected(new ApplicationException("Update grammar request error:\nRequested grammar not found.")));
}
if (GrammarList[grammarId].isTutorial)
{
return(WebAPI.GetTutorial(grammarId)
.Then(grammar => {
grammarList[grammarId] = grammar;
SaveGrammarList();
return grammar;
}));
}
return(WebAPI.GetGrammar(grammarId)
.Then(grammar => {
grammarList[grammarId] = grammar;
SaveGrammarList();
return grammar;
}));
}