public async Task ProcessAsync(SearchResultHandlerContext context)
{
await Task.Yield();
foreach (var searchResult in context.SearchResults)
{
string entityName = searchResult.Document[Document.EntityNameFieldName].ToString();
if (entityName != Document.MetadataEntityName)
{
continue;
}
foreach (var highlight in searchResult.Highlights)
{
foreach (string fragment in highlight.Value)
{
foreach (var fragmentToken in FragmentHelper.GetTokensFromFragment(fragment, context.SearchParameters.HighlightPreTag, context.SearchParameters.HighlightPostTag))
{
//
// Question: what if the same word shows in multiple positions?
//
var searchToken = context.SearchTokens.FirstOrDefault(p => StringComparer.OrdinalIgnoreCase.Equals(p.Token, fragmentToken.Token));
if (searchToken == null)
{
_logger.LogWarning($"Token value '{fragmentToken.Token}' isn't matched.");
continue;
}
//
// Question: why offset is nullable?
//
string matchedText = context.SearchText[(int)searchToken.StartOffset..(int)searchToken.EndOffset];
private IEnumerable <(string, int)> FindMatchedTexts(SearchResultHandlerContext context, string fragment)
{
var fragmentTokens = FragmentHelper.GetTokensFromFragment(fragment, context.SearchParameters.HighlightPreTag, context.SearchParameters.HighlightPostTag);
var fragmentTokenBindings = CreateTokenBindings(fragmentTokens.ToList(), context.SearchTokens);
for (int length = fragmentTokenBindings.Count; length > 0; length--)
{
for (int index = 0; index + length - 1 < fragmentTokenBindings.Count; index++)
{
var startFragmentTokenBindings = fragmentTokenBindings[index];
var endFragmentTokenBindings = fragmentTokenBindings[index + length - 1];
if (startFragmentTokenBindings == endFragmentTokenBindings)
{
foreach (var startSearchToken in startFragmentTokenBindings.SearchTokens)
{
yield return(context.SearchText[((int)startSearchToken.StartOffset)..((int)startSearchToken.EndOffset)], (int)startSearchToken.StartOffset);