public void Should_Calculate_Levenshtein_Distance_Correctly(string source, string target, int expected)
{
// Given, When
var result = LevenshteinScorer.Score(source, target, false);
// Then
Assert.Equal(expected, result);
}
private static float CalculateDistance(IndexedEntry entry, string query)
{
#if DEBUG
return(Math.Min(LevenshteinScorer.Distance(entry.Title, query),
LevenshteinScorer.Distance(entry.Description ?? entry.Title, query)));
#else
return(0);
#endif
}
public override async Task <IEnumerable <IQueryResult> > QueryAsync(Query query)
{
Ensure.NotNull(query, nameof(query));
if (string.IsNullOrWhiteSpace(query.Argument))
{
var uri = new Uri("https://en.wikipedia.org");
return(new[]
{
(IQueryResult) new WikipediaResult(
uri, "Open Wikipedia in browser",
uri.AbsoluteUri, 0, 0)
});
}
try
{
var uri = $"https://en.wikipedia.org/w/api.php?action=opensearch&profile=fuzzy&limit=5&search={Encode(query.Argument)}";
var result = await _client.GetAsync(uri);
if (result.IsSuccessStatusCode)
{
var data = await result.Content.ReadAsStringAsync();
var keywords = JArray.Parse(data)[1].Where(x => x.Type == JTokenType.String).Select(x => x.Value <string>());
var uris = JArray.Parse(data)[3].Where(x => x.Type == JTokenType.String).Select(x => new Uri(x.Value <string>()));
var results = keywords
.Zip(uris, (title, url) =>
(IQueryResult) new WikipediaResult(url, title, url.AbsoluteUri,
LevenshteinScorer.Score(title, query.Argument, false),
LevenshteinScorer.Score(title, query.Argument)))
.ToList();
if (!results.Any())
{
var fallbackUrl = new Uri($"https://en.wikipedia.org/wiki/{Encode(query.Argument)}");
return(new[]
{
(IQueryResult) new WikipediaResult(
fallbackUrl, $"Search Wikipedia for '{query.Argument}'",
fallbackUrl.AbsoluteUri, 0, 0)
});
}
return(results);
}
}
catch (Exception e)
{
_log.Error(e, "An error occured while querying Wikipedia.");
}
return(Enumerable.Empty <IQueryResult>());
}
public static IQueryResult Create(Query query, string term = null, string description = null)
{
Ensure.NotNull(query, nameof(query));
term = term ?? query.Argument;
description = description ?? term;
var isGoogleQuery = !(term.StartsWith("http://") || term.StartsWith("https://"));
var uri = isGoogleQuery ? new Uri($"https://www.google.se/search?q={WebUtility.UrlEncode(term)}") : new Uri(term);
return(new GoogleResult(uri, isGoogleQuery, description, uri.AbsoluteUri,
isGoogleQuery ? LevenshteinScorer.Score(term, query.Argument, false) : 0,
isGoogleQuery ? LevenshteinScorer.Score(term, query.Argument) : 0));
}
private static float CalculateScore(IndexedEntry entry, string query)
{
return(Math.Min(LevenshteinScorer.Score(entry.Title, query),
LevenshteinScorer.Score(entry.Description ?? entry.Title, query)));
}
