private void RequestVariable(InferenceContext context)
{
var requestTask = VariableRequester.Invoke(context.Goal);
var configuredTaskAwaitable = requestTask.ConfigureAwait(true);
var configuredTaskAwaiter = configuredTaskAwaitable.GetAwaiter();
var answerFact = configuredTaskAwaiter.GetResult();
context.Resolved.Add(answerFact);
context.Result = answerFact;
WorkingMemory.ResolvedFacts.Add(answerFact);
WorkingMemory.Log(answerFact, true);
}
public Fact Deduce(Variable goal)
{
WorkingMemory = new WorkingMemory {
Goal = goal
};
var context = new InferenceContext()
{
Goal = goal,
RulesToDeduce = GetRulesToDeduceVariable(goal),
};
WorkingMemory.InferenceStack.Push(context);
WorkingMemory.Log(goal);
while (WorkingMemory.InferenceStack.Count > 0)
{
if (WorkingMemory.TriggeredRules.Count > MaxTriggeredRules)
{
WorkingMemory.Log("Превышен лимит попыток вывода правил");
break;
}
context = WorkingMemory.InferenceStack.Pop();
if (context.Goal.VariableKind == VariableKind.Requested)
{
RequestVariable(context);
continue;
}
//if (context.RuleToDeduce == null)
//{
// if (context.RulesToDeduce.Count == 0)
// {
// if (context.Result == null && WorkingMemory.InferenceStack.Count > 0)
// {
// WorkingMemory.InferenceStack.Peek().RuleToDeduce = null;
// WorkingMemory.InferenceStack.Peek().FactToCheck = null;
// }
// continue;
// }
// context.RuleToDeduce = context.RulesToDeduce.Dequeue();
// WorkingMemory.TriggeredRules.Add(context.RuleToDeduce);
// WorkingMemory.Log(context.RuleToDeduce);
//}
//if (context.FactsToCheck.Count == 0)
//{
// context.FactsToCheck = new Queue<Fact>(context.RuleToDeduce.Premise);
//}
//context.FactToCheck = context.FactsToCheck.Dequeue();
if (context.FactsToCheck.Count > 0)
{
context.FactToCheck = context.FactsToCheck.Pop();
}
else
{
if (context.RulesToDeduce.Count > 0)
{
context.RuleToDeduce = context.RulesToDeduce.Dequeue();
context.FactsToCheck = new Stack <Fact>(context.RuleToDeduce.Premise);
context.FactToCheck = context.FactsToCheck.Pop();
WorkingMemory.TriggeredRules.Add(context.RuleToDeduce);
WorkingMemory.Log(context.RuleToDeduce);
}
else
{
if (WorkingMemory.InferenceStack.Count > 0)
{
WorkingMemory.InferenceStack.Peek().FactsToCheck.Pop();
}
continue;
}
}
var resolvedFact =
WorkingMemory
.ResolvedFacts
.FirstOrDefault(f => f.Variable == context.FactToCheck.Variable);
if (resolvedFact == null)
{
var newContext = new InferenceContext()
{
Goal = context.FactToCheck.Variable,
RulesToDeduce = GetRulesToDeduceVariable(context.FactToCheck.Variable),
};
context.FactsToCheck.Push(context.FactToCheck);
WorkingMemory.InferenceStack.Push(context);
WorkingMemory.InferenceStack.Push(newContext);
WorkingMemory.Log(newContext.Goal);
}
else
{
if (resolvedFact.Value == context.FactToCheck.Value)
{
if (context.FactsToCheck.Count == 0)
{
var resolved = context.RuleToDeduce.Conclusion;
context.Resolved.AddRange(resolved);
context.Result = resolved.FirstOrDefault(f => f.Variable == context.Goal);
WorkingMemory.FiredRules.Add(context.RuleToDeduce);
WorkingMemory.ResolvedFacts.AddRange(resolved);
WorkingMemory.Log(context.RuleToDeduce, true);
WorkingMemory.Log(resolved);
context.RuleToDeduce = null;
}
else
{
WorkingMemory.InferenceStack.Push(context);
}
context.FactToCheck = null;
}
else
{
context.FactToCheck = null;
context.RuleToDeduce = null;
WorkingMemory.InferenceStack.Push(context);
}
}
}
DeduceEnded?.Invoke(context.Result);
WorkingMemory.Result = context.Result;
return(WorkingMemory.Result);
}
