internal IEnumerable <SemanticItem> Generate(SemanticItem input)
{
var inputText = input.InstantiateInputWithEntityVariables();
var inputTokens = tokenize(inputText);
initializeParts(inputText);
while (true)
{
var item = generateCurrentState(inputTokens, _pattern.Constraints);
if (item != null)
{
yield return(item);
}
var i = 0;
while (!_parts[i].ShiftNext())
{
i += 1;
if (i >= _parts.Length)
{
yield break;
}
_parts[i - 1].Reset();
}
}
}
private IEnumerable <SemanticItem> fetchMatchingEntries(SemanticItem queryItem)
{
if (queryItem.Question == null)
{
throw new NotImplementedException();
}
if (queryItem.Answer != null)
{
throw new NotImplementedException();
}
var result = new List <SemanticItem>();
if (queryItem.Question == Question.IsItTrue)
{
//TODO conditions should be more general thing
var inputConditions = new HashSet <string>(queryItem.Constraints.Conditions);
var condition = queryItem.InstantiateInputWithEntityVariables();
logDependency(condition);
if (inputConditions.Contains(condition))
{
//condition is met because of input
result.Add(SemanticItem.Entity(YesAnswer));
}
var negatedCondition = Constraints.Negate(condition);
if (inputConditions.Contains(negatedCondition))
{
//we have got a negative result
result.Add(SemanticItem.Entity(NoAnswer));
}
}
if (result.Count > 0)
{
return(result);
}
foreach (var item in GetData())
{
if (item.Question != queryItem.Question)
{
continue;
}
/*if ((item.Constraints.Input == null) != (queryItem.Constraints == null))
* //when input is provided it should be considered
* continue;*/
if (item.Constraints.Input != null)
{
var matcher = new InputMatcher();
var itemMatches = matcher.Match(item, queryItem).ToArray();
var matchedItems = new List <SemanticItem>();
foreach (var match in itemMatches)
{
if (meetConditions(queryItem, match))
{
matchedItems.Add(match);
}
}
result.AddRange(matchedItems.OrderByDescending(i => rank(i)));
}
else
{
if (meetConditions(queryItem, item))
{
result.Add(item);
}
}
if (result.Count > 0)
{
break;
}
}
return(result);
}