private static RankedName CalculateRankForName(SearchReadyValue name,
List <string> searchTerms,
string query,
bool queryContainsPunctuation,
int nameIndex)
{
var rankValues = new List <double>();
rankValues.Add(CalculateRankValueForPrefixMatch(name, query));
rankValues.Add(CalculateRankValueForAcronymMatch(name, query));
for (int searchTermIndex = 0; searchTermIndex < searchTerms.Count; searchTermIndex++)
{
string searchTerm = searchTerms[searchTermIndex];
List <string> words = queryContainsPunctuation ? name.LowercaseWordsWithPunctuation : name.LowercaseWords;
for (int wordIndex = 0; wordIndex < words.Count; wordIndex++)
{
string word = words[wordIndex];
rankValues.Add(
CalculateRankValueForWordMatch(word, query, searchTerm, searchTermIndex, wordIndex, nameIndex));
}
}
return(new RankedName
{
Name = name.OriginalValue, Ranks = rankValues.OrderByDescending(r => r).Take(5).ToList()
});
}
private static double CalculateRankValueForAcronymMatch(SearchReadyValue name, string query)
{
if (name.Acronym.StartsWith(query))
{
// Acronym Prefix match
double prefixAmount = (double)query.Length / (double)name.Acronym.Length;
double rankValue = prefixAmount;
return(rankValue);
}
return(0);
}
public static double CalculateRankValueForPrefixMatch(SearchReadyValue name, string query)
{
if (name.LowercaseValue.StartsWith(query))
{
// Prefix match
double prefixAmount = (double)query.Length / (double)name.LowercaseValue.Length;
double rankValue = (prefixAmount / 2) + 0.5;
return(rankValue);
}
return(0);
}
public static List <RankedName> GetRankedNames(List <SearchReadyValue> organisationNames,
List <string> searchTerms,
string query,
bool queryContainsPunctuation)
{
var names = new List <RankedName>();
for (var nameIndex = 0; nameIndex < organisationNames.Count; nameIndex++)
{
SearchReadyValue name = organisationNames[nameIndex];
names.Add(CalculateRankForName(name, searchTerms, query, queryContainsPunctuation, nameIndex));
}
return(names);
}