private ResponseBase proposeNewQuestion(bool atLeast)
{
_actualQuestion = getNextQuestion();
_isRephrasePhase = true;
_questionRephraseWords.Clear();
CanBeCompleted = true;
AskedDenotations.Clear();
LastDenotationQuestion = DenotationType.None;
return(new RephraseQuestionProposeAct(_actualQuestion, atLeast));
}
/// <inheritdoc/>
public override ResponseBase Input(ParsedUtterance utterance)
{
if (_isDialogClosed)
{
//dialog has been closed - don't say anything
return(null);
}
//input processing
var utteranceAct = Factory.GetBestDialogAct(utterance);
var hasNegation = utteranceAct is NegateAct;
var hasAffirmation = utteranceAct is AffirmAct;
var isChitChat = utteranceAct is ChitChatAct;
var questionOnInput = utterance.OriginalSentence.Contains("?") || utteranceAct is QuestionAct;
//dialog state collection
var isQuestionRegistered = _reqisteredQuestion != null;
var isExpectingDenotation = isQuestionRegistered;
var isExpectingAnswer = isExpectingDenotation && LastDenotationQuestion == DenotationType.CorrectAnswer;
var isExpectingExplanation = isExpectingDenotation && LastDenotationQuestion == DenotationType.Explanation;
var nonAskedDenotationType = GetNonaskedDenotationType();
//dialog handling
if (isChitChat)
{
return(HandleChitChat(utteranceAct as ChitChatAct));
}
if (isQuestionRegistered && questionOnInput)
{
//QUESTION OVERRIDING
//TODO: how to distinguish between asking different question or explaining by a question?
}
else if (!isQuestionRegistered && questionOnInput)
{
//FIRST QUESTION REGISTRATION
//prepare question answering
_reqisteredQuestion = utterance;
AskedDenotations.Clear();
}
if (!isQuestionRegistered && hasAffirmation)
{
//AFFIRMATION AT BEGINING
return(new ContinueAct());
}
else if (!isQuestionRegistered && !questionOnInput)
{
//UNRECOGNIZED UTTERANCE WHEN QUESTION EXPECTED
return(new DontUnderstandAct());
}
else if (isExpectingDenotation && hasAffirmation)
{
//USER CONFIRMS WILLINGNESS TO PROVIDE DENOTATION
return(new ContinueAct());
}
else if (isExpectingDenotation && hasNegation)
{
if (nonAskedDenotationType == DenotationType.None)
{
_isDialogClosed = true;
return(new IncompleteByeAct());
}
return(AskAtLeast(nonAskedDenotationType));
}
else if (isExpectingAnswer)
{
var hasDatabaseEvidence = false;
//search whether answer contains some entity from knowledge base
foreach (var word in utterance.Words)
{
if (_graph.HasEvidence(word))
{
hasDatabaseEvidence = true;
}
}
if (!hasDatabaseEvidence)
{
return(AskForMissingFact());
}
}
else if (isExpectingExplanation)
{
var explanationLength = utterance.Words.Count();
if (explanationLength < 5)
{
return(new TooBriefExplanationAct());
}
var diffWords = utterance.Words.Except(_reqisteredQuestion.Words).Except(UtteranceParser.NonInformativeWords).ToArray();
if (diffWords.Length < 3)
{
return(new UnwantedRephraseDetected());
}
}
//reset last denotation
LastDenotationQuestion = DenotationType.None;
//we don't have an answer - try to ask
if (nonAskedDenotationType != DenotationType.None)
{
return(Ask(nonAskedDenotationType));
}
//we have already asked everything
_isDialogClosed = true;
return(new ByeAct());
}