/// <summary>
/// Purges the invalid results when SearchOptions is AllWords.
/// </summary>
/// <param name="results">The results to purge.</param>
/// <param name="queryWords">The query words.</param>
/// <returns>The relevance value of the removed matches.</returns>
public static float PurgeResultsForAllWords(SearchResultCollection results, string[] queryWords)
{
// Remove results that do not contain all the searched words
float relevanceToRemove = 0;
List <SearchResult> toRemove = new List <SearchResult>();
foreach (SearchResult r in results)
{
if (r.Matches.Count < queryWords.Length)
{
toRemove.Add(r);
}
else
{
foreach (string w in queryWords)
{
if (!r.Matches.Contains(w))
{
toRemove.Add(r);
break;
}
}
}
}
foreach (SearchResult r in toRemove)
{
results.Remove(r);
relevanceToRemove += r.Relevance.Value;
}
return(relevanceToRemove);
}
/// <summary>
/// Purges the invalid results when SearchOptions is ExactPhrase.
/// </summary>
/// <param name="results">The results to purge.</param>
/// <param name="queryWords">The query words.</param>
/// <returns>The relevance value of the removed matches.</returns>
public static float PurgeResultsForExactPhrase(SearchResultCollection results, string[] queryWords)
{
// Remove results that do not contain the exact phrase
float relevanceToRemove = 0;
List <SearchResult> toRemove = new List <SearchResult>();
foreach (SearchResult r in results)
{
// Shortcut
if (r.Matches.Count < queryWords.Length)
{
toRemove.Add(r);
}
else
{
// Verify that all matches are in the same order as in the query
// and that their indices make up contiguous words,
// re-iterating from every word in the result, for example:
// query = 'repeated content', result = 'content repeated content'
// result must be tested with 'content repeated' (failing) and with 'repeated content' (succeeding)
int maxTestShift = 0;
if (queryWords.Length < r.Matches.Count)
{
maxTestShift = r.Matches.Count - queryWords.Length;
}
bool sequenceFound = false;
for (int shift = 0; shift <= maxTestShift; shift++)
{
int firstWordIndex = r.Matches[shift].WordIndex;
bool allOk = true;
for (int i = 0; i < queryWords.Length; i++)
{
if (queryWords[i] != r.Matches[i + shift].Text.ToLowerInvariant() ||
r.Matches[i + shift].WordIndex != firstWordIndex + i)
{
allOk = false;
break;
}
}
if (allOk)
{
sequenceFound = true;
break;
}
}
if (!sequenceFound)
{
toRemove.Add(r);
}
}
}
foreach (SearchResult r in toRemove)
{
results.Remove(r);
relevanceToRemove += r.Relevance.Value;
}
return(relevanceToRemove);
}
