public TextualContextAreaViewModel( ITextualContextService textualContext, IPredictionTextAreaService predictionTextArea, ICommandTextualContextService commandTextualContextService )
{
_textualContext = textualContext;
_predictionTextArea = predictionTextArea;
_predictionTextArea.TextSent += OnPredictionAreaContentSent;
_commandTextualContextService = commandTextualContextService;
}
/// <summary>
/// Gets the prediction context (all the text that has been written since the last "Return")
/// </summary>
/// <param name="textualService"></param>
/// <returns></returns>
public string ObtainContext( ITextualContextService textualService )
{
if( textualService.Tokens.Count > 1 )
{
string tokenPhrase = String.Join( " ", textualService.Tokens.Take( textualService.CurrentTokenIndex ).Select( t => t.Value ) );
tokenPhrase += " ";
if( textualService.Tokens.Count >= textualService.CurrentTokenIndex )
{
string value = textualService.Tokens[textualService.CurrentTokenIndex].Value;
if( value.Length >= textualService.CaretOffset )
{
tokenPhrase += ( value.Substring( 0, textualService.CaretOffset ) );
}
}
return tokenPhrase;
}
if( textualService.Tokens.Count == 1 )
{
return textualService.CurrentToken.Value.Substring( 0, textualService.CaretOffset );
}
return String.Empty;
}
public Task<IEnumerable<IWordPredicted>> PredictAsync( ITextualContextService textualContext, int maxSuggestedWords )
{
if( _currentlyRunningTaskCancellationToken == null )
_currentlyRunningTaskCancellationToken = new CancellationToken( false );
if( _currentlyRunningTask != null && _currentlyRunningTask.Status == TaskStatus.Running )
{
_cancellationSource.Cancel();
}
else
{
_currentlyRunningTask = Task.Factory.StartNew( () => Predict( textualContext, maxSuggestedWords ), _currentlyRunningTaskCancellationToken );
}
return _currentlyRunningTask;
}
public IEnumerable<IWordPredicted> Predict( ITextualContextService textualService, int maxSuggestedWords )
{
//This call can sometimes raise an ArgumentException
//TODO : log it and catch it to go on.
IEnumerable<WeightlessWordPredicted> result = null;
try
{
result = _sybille
.Predict( ObtainSybilleContext( textualService ), maxSuggestedWords )
.Select( t => new WeightlessWordPredicted( t ) );
}
catch( ArgumentException )
{
return Enumerable.Empty<IWordPredicted>();
}
return result;
}
/// <summary>
/// Calls <see cref="ObtainContext( ITextualContextService textualService )"/> and replaces all occurences of "'" (apostrophe) by "' " (apostrophe + space).
/// Done so because Sybille doesn't understand the apostrophe character. therefor, in order to get a prediction for the word that follows this char, we flush Sybille's context thanks to the space char.
/// </summary>
public virtual string ObtainSybilleContext( ITextualContextService textualService )
{
return ObtainContext( textualService ).Replace( "'", "' " );
}
public string ObtainRawContext( ITextualContextService textualContextService )
{
throw new NotImplementedException();
}
public System.Threading.Tasks.Task<IEnumerable<IWordPredicted>> PredictAsync( ITextualContextService textualContext, int maxSuggestedWords )
{
throw new NotImplementedException();
}
public IEnumerable<IWordPredicted> Predict( ITextualContextService textualService, int maxSuggestedWord )
{
throw new NotImplementedException();
}
