private static List <string> GenerateTree(
ICompiledGram gram,
CircularQueue <string> prior,
int size,
int index,
List <string> acceptedTypes,
Func <string, string> classifier)
{
string[] guesses = gram.GetGuesses(prior.ToArray());
foreach (string guess in guesses)
{
if (classifier != null &&
!classifier(guess).Equals(acceptedTypes[index]))
{
continue;
}
CircularQueue <string> newPrior = prior.Clone();
newPrior.Add(guess);
if (size <= 1)
{
return(new List <string>()
{
guess
});
}
else if (gram.HasNextStep(newPrior.ToArray()))
{
List <string> returnVal = GenerateTree(
gram,
newPrior,
size - 1,
index + 1,
acceptedTypes,
classifier);
if (returnVal != null)
{
returnVal.Insert(0, guess);
return(returnVal);
}
}
}
return(null);
}
// @NOTE: this is used for simulation. Do not use outside of it.
public static List <string> GenerateBestAttempt(
ICompiledGram gram,
List <string> start,
int size,
int maxAttempts)
{
List <string> best = null;
for (int i = 0; i < maxAttempts; ++i)
{
CircularQueue <string> prior = new CircularQueue <string>(gram.GetN() - 1);
prior.AddRange(start);
List <string> output = new List <string>();
while (size > 0 && gram.HasNextStep(prior.ToArray()))
{
string nextToken = gram.Get(prior.ToArray());
output.Add(nextToken);
prior.Add(nextToken);
--size;
}
if (size == 0)
{
best = output;
break;
}
if (best == null)
{
best = output;
}
else if (output.Count > best.Count)
{
best = output;
}
}
return(best);
}
// @NOTE: this is used for simulation. Do not use outside of it.
public static List <string> GenerateBestRestrictedAttempt(
ICompiledGram gram,
List <string> start,
List <string> acceptedTypes,
Func <string, string> classifier,
int maxAttempts)
{
List <string> best = null;
for (int attempt = 0; attempt < maxAttempts; ++attempt)
{
CircularQueue <string> prior = new CircularQueue <string>(gram.GetN() - 1);
prior.AddRange(start);
int acceptedTypeIndex = 0;
List <string> output = new List <string>();
string token;
int i;
while (acceptedTypeIndex < acceptedTypes.Count && gram.HasNextStep(prior.ToArray()))
{
string[] tokens = gram.GetGuesses(prior.ToArray());
string nextToken = null;
string acceptedType = acceptedTypes[acceptedTypeIndex];
for (i = 0; i < tokens.Length; ++i)
{
token = tokens[i];
if (classifier.Invoke(token).Equals(acceptedType))
{
nextToken = token;
}
}
if (nextToken != null)
{
output.Add(nextToken);
prior.Add(nextToken);
acceptedTypeIndex += 1;
}
else
{
break;
}
}
if (output.Count == acceptedTypes.Count)
{
best = output;
break;
}
if (best == null)
{
best = output;
}
else if (output.Count > best.Count)
{
best = output;
}
}
return(best);
}
