/// <summary>
/// Gets a list of suggested words from the active word storage, based on what was typed by the user.
/// </summary>
/// <param name="searchQuery">The typed search query.</param>
/// <returns>A list of suggested words.</returns>
public List <SuggestedWord> GetSuggestedWords(string searchQuery)
{
if (string.IsNullOrEmpty(searchQuery) || _activeWordStorage == null || !_activeWordStorage.IsReady)
{
return(new List <SuggestedWord>());
}
string[] words = searchQuery.Split(SpaceCharArray, StringSplitOptions.RemoveEmptyEntries);
List <SuggestedWord> suggestedWords = new List <SuggestedWord>();
// query only had spaces
if (words.Length == 0)
{
return(suggestedWords);
}
string lastWord = words[words.Length - 1];
if (searchQuery[searchQuery.Length - 1] != ' ')
{
suggestedWords.AddRange(
_activeWordStorage.GetWordsWithPrefix(lastWord)
.Select(word => new SuggestedWord(word, SuggestedWord.SuggestionType.Prefixed)));
}
if (suggestedWords.Count >= SuggestedWordsCountThreshold)
{
return(suggestedWords);
}
suggestedWords.AddRange(
_activeWordStorage.GetFollowUpWords(lastWord)
.Where(word => !suggestedWords.Any(suggested => suggested.Word == word))
.Select(word => new SuggestedWord(word, SuggestedWord.SuggestionType.FollowUp)));
// if we still don't reach the threshold of suggestions, assume there's a/some typo(s) => use fuzzy string matching
if (suggestedWords.Count >= SuggestedWordsCountThreshold)
{
return(suggestedWords);
}
int tolerance = Math.Min(2, Convert.ToInt32(lastWord.Length * 0.7f));
suggestedWords.AddRange(
_activeWordStorage.GetFuzzyMatchedWords(lastWord, tolerance)
.Where(word => !suggestedWords.Any(suggested => suggested.Word == word))
.Select(word => new SuggestedWord(word, SuggestedWord.SuggestionType.FuzzyMatch)));
if (suggestedWords.Count >= SuggestedWordsCountThreshold)
{
return(suggestedWords);
}
suggestedWords.AddRange(
_activeWordStorage.GetFuzzyMatchedWordsAlternate(lastWord)
.Where(word => !suggestedWords.Any(suggested => suggested.Word == word))
.Select(word => new SuggestedWord(word, SuggestedWord.SuggestionType.FuzzyMatch)));
return(suggestedWords);
}
/// <summary>
/// Gets a list of suggested words from the active word storage, based on what was typed by the user.
/// </summary>
/// <param name="searchQuery">The typed search query.</param>
/// <returns>A list of suggested words.</returns>
public List <string> GetSuggestedWords(string searchQuery)
{
if (string.IsNullOrEmpty(searchQuery) || _activeWordStorage == null || !_activeWordStorage.IsReady)
{
return(new List <string>());
}
string[] words = searchQuery.Split(new char[] { ' ' }, System.StringSplitOptions.RemoveEmptyEntries);
List <string> suggestedWords = new List <string>();
// query only had spaces
if (words.Length == 0)
{
return(suggestedWords);
}
string lastWord = words[words.Length - 1];
if (searchQuery[searchQuery.Length - 1] != ' ')
{
suggestedWords.AddRange(_activeWordStorage.GetWordsWithPrefix(lastWord));
}
suggestedWords.AddRange(_activeWordStorage.GetFollowUpWords(lastWord));
return(suggestedWords);
}
