private IEnumerable <string> ComputeForms(string noun)
{
var exceptions = ExceptionMapping.GetValueOrDefault(noun);
if (exceptions != null)
{
foreach (var exception in exceptions)
{
yield return(exception);
}
yield break;
}
var hyphenIndex = noun.LastIndexOf('-');
var root = FindRoot(hyphenIndex > -1 ? noun.Substring(hyphenIndex + 1) : noun);
var hyphenatadAppendage = hyphenIndex > -1 ? noun.Substring(0, hyphenIndex + 1) : string.Empty;
IEnumerable <string> results;
if (!ExceptionMapping.TryGetValue(root, out results))
{
foreach (var form in synthesize())
{
yield return(form);
}
}
else
{
foreach (var form in from result in results select hyphenatadAppendage + result)
{
yield return(form);
}
}
yield return(hyphenatadAppendage + root);
IEnumerable <string> synthesize()
{
for (var i = 0; i < sufficies.Length; i++)
{
if (root.EndsWith(endings[i]) || endings[i].Length == 0)
{
yield return(hyphenatadAppendage + root.Substring(0, root.Length - endings[i].Length) + sufficies[i]);
yield break;
}
}
}
}
IEnumerable <string> ComputeForms(string containingRoot)
{
var hyphenIndex = containingRoot.IndexOf('-');
var root = FindRoot(hyphenIndex > -1 ? containingRoot.Substring(0, hyphenIndex) : containingRoot);
var hyphenatedAppendage = hyphenIndex > -1 ? root.Substring(hyphenIndex) : "";
IEnumerable <string> exceptionalForms;
if (!ExceptionMapping.TryGetValue(root, out exceptionalForms))
{
foreach (var(suffix, ending) in suffices.Zip(endings))
{
if (root.EndsWith(suffix, ordinalIgnoreCase) || string.IsNullOrEmpty(ending))
{
if (root.EndsWith("y", ordinalIgnoreCase))
{
root = root.Substring(0, root.Length - 1) + 'i';
}
yield return(root + ending + hyphenatedAppendage);
}
}
yield break;
}
}