// Summary:
// Generates a poem line by the poem schema and syntax rules.
//
// Parameters:
// schemaLine:
// The schema by which the poem line should be constructed.
// document:
// The object which represents the syntax rules to build a poem.
// Returns:
// The string containing the generated poem line.
// Exceptions:
// System.ArgumentNullException:
// document is null.
// PoemGenerationException:
// failed to convert string type to PartOfSpeech enum type.
public virtual string GeneratePoemLine(string schemaLine, IPoemSyntaxRuleDocument doc)
{
if (doc == null)
{
throw new ArgumentNullException("document", "Argument cannot be null.");
}
int maxStep = config.MaxSyllablesCount;
List <string> poemWords = new List <string>();
List <string> nodes = doc.GetRootElements();
string nextNode = String.Empty;
int i = 0;
while (i < schemaLine.Length)
{
string foot = String.Empty;
int footSize = default(int);
List <Word> matchedWords = new List <Word>();
do
{
footSize = footRandomGenerator.Generate(1, maxStep + 1);
if (i + footSize >= schemaLine.Length)
{
foot = schemaLine.Substring(i);
//in case the last word in the line, retrive only the elements contaning END node
List <string> nodes1 = nodes.Intersect(doc.GetAllEndElements()).ToList();
nextNode = nodes1[nodeRandomGenerator.Generate(0, nodes1.Count())];
}
else
{
foot = schemaLine.Substring(i, footSize);
nextNode = nodes[nodeRandomGenerator.Generate(0, nodes.Count())];
}
//in case one syllable it can be both stressed and unstressed
if (foot.Length == 1)
{
foot = "x,-";
}
PartOfSpeech partOfSpeech;
if (converter.ConvertToEnumType(nextNode, out partOfSpeech))
{
matchedWords = dictionaryRepository.GetWords(foot, partOfSpeech);
}
else
{
throw new PoemGenerationException("Unable to convert the part of speech from string type to enum type. String: " + nextNode);
}
}while (matchedWords.Count() == 0);
string w = matchedWords[wordRandomGenerator.Generate(0, matchedWords.Count())].Value;
poemWords.Add(w);
i += footSize;
nodes = doc.GetNextElements(nextNode);
}
return(string.Join(" ", poemWords));
}
