// ***
// -------------------------------
// Methods for building sentences.
// -------------------------------
// ***
public IEnumerable <Sentence> BuildSentences(IEnumerable <string> seeds, string source)
{
if (seeds == null)
{
throw new ArgumentNullException(nameof(seeds));
}
using (var buildVectors = new BuilderVectors(conn, source))
{
foreach (string seed in seeds)
{
if (string.IsNullOrEmpty(seed))
{
continue;
}
buildVectors.PrepareSeedSql(seed);
foreach (var sentence in Builder(buildVectors))
{
yield return(sentence);
}
}
}
}
public IEnumerable <Sentence> BuildRandomSentences(string source)
{
using (var buildVectors = new BuilderVectors(conn, source))
{
buildVectors.PrepareRandomSql();
foreach (var sentence in Builder(buildVectors))
{
yield return(sentence);
}
}
}
IEnumerable <Sentence> Builder(BuilderVectors v)
{
// Copies out the volatile field, so we have a consistent MaxWords while building.
var words = new SentenceConstruct(Order, MaxWords);
using (var reader = v.StartingChains.ExecuteReader())
{
while (reader.Read())
{
string backward = reader.GetString(0);
string chain = reader.GetString(1);
string forward = reader.GetString(2);
words.Set(chain);
if (backward != string.Empty)
{
// Backward search.
words.PrependMode();
words.ModeAdd(backward);
CollectChains(words, v.BackwardSearch);
}
if (forward != string.Empty && words.Continue)
{
// Forward search.
words.AppendMode();
words.ModeAdd(forward);
CollectChains(words, v.ForwardSearch);
}
var segment = words.CurrentSegment();
long[] wordCounts = WordCount(segment, v.WordCount);
yield return(new Sentence(segment, wordCounts));
}
}
}
