public static double ScoreExactMatch(string subject, string subjectLw, string query, string queryLw, int pos, int n, int m)
{
var start = ScorerUtil.IsWordStart(pos, subject, subjectLw);
if (!start)
{
var pos2 = subjectLw.IndexOf(queryLw, pos + 1);
if (pos2 > -1)
{
start = ScorerUtil.IsWordStart(pos2, subject, subjectLw);
if (start)
{
pos = pos2;
}
}
}
var i = -1;
var sameCase = 0;
while (++i < n)
{
if ((query.Length > (pos + i) && subject.Length > i) && (query[pos + i] == subject[i]))
{
sameCase++;
}
}
var end = ScorerUtil.IsWordEnd(pos + n - 1, subject, subjectLw, m);
return(ScoreExact(n, m, ScorePattern(n, n, sameCase, start, end), pos));
}
public static double ScoreConsecutives(string subject, string subjectLw, string query, string queryLw, int i,
int j, bool startOfWord)
{
var m = subject.Length;
var n = query.Length;
var mi = m - i;
var nj = n - j;
var k = mi < nj ? mi : nj;
var sameCase = 0;
var sz = 0;
if (query[j] == subject[i])
{
sameCase++;
}
while (++sz < k && queryLw[++j] == subjectLw[++i])
{
if (query[j] == subject[i])
{
sameCase++;
}
}
if (sz < k)
{
i--;
}
return(ScorePattern(sz, n, sameCase, startOfWord, ScorerUtil.IsWordEnd(i, subject, subjectLw, m)));
}
private double ScorePath(string subject, string subjectLw, double score, StringScorerOptions options)
{
if (score == 0)
{
return(0);
}
var pathSeparator = Convert.ToChar(options.PathSeparator);
var end = subject.Length - 1;
while (subject[end] == pathSeparator)
{
end--;
}
var basePos = subject.LastIndexOf(pathSeparator, end);
var fileLength = end - basePos;
var extAdjust = 1.0;
if (options.UseExtensionBonus)
{
extAdjust += GetExtensionScore(subjectLw, options.PreparedQuery.Ext, basePos, end, 2);
score *= extAdjust;
}
if (basePos == -1)
{
return(score);
}
var depth = options.PreparedQuery.Depth;
while (basePos > -1 && depth-- > 0)
{
basePos = subject.LastIndexOf(options.PathSeparator, basePos - 1);
}
double basePathScore = 0.0;
if (basePos == -1)
{
basePathScore = score;
}
else
{
basePathScore = extAdjust * Scorer.ComputeScore(subject.Slice(basePos + 1, end + 1), subjectLw.Slice(basePos + 1, end + 1), options.PreparedQuery);
}
var alpha = 0.5 * CONST_TAU_DEPTH / (CONST_TAU_DEPTH + ScorerUtil.CountDir(subject, end + 1, Convert.ToChar(options.PathSeparator)));
return(alpha * basePathScore + (1 - alpha) * score * Scorer.ScoreSize(0, CONST_FILE_COEFF * (fileLength)));
}
public static double ComputeScore(string subject, string subjectLw, StringScorerQuery preparedQuery)
{
var query = preparedQuery.Query;
var queryLw = preparedQuery.QueryLw;
var score = 0.0;
var m = subject.Length;
var n = query.Length;
var acro = AcronymResult.ScoreAcronyms(subject, subjectLw, query, queryLw);
var acroScore = acro.Score;
if (acro.Count == n)
{
return(Scorer.ScoreExact(n, m, acroScore, acro.Pos));
}
var pos = subjectLw.IndexOf(queryLw);
if (pos > -1)
{
return(ScoreExactMatch(subject, subjectLw, query, queryLw, pos, n, m));
}
var scoreRow = new double[n];
var cscRow = new double[n];
var sz = Scorer.ScoreSize(n, m);
var missBudget = Math.Ceiling(CONST_MISS_COEFF * n) + 5;
var missLeft = missBudget;
var cscShouldRebuild = true;
var j = -1;
while (++j < n)
{
scoreRow[j] = 0;
cscRow[j] = 0;
}
var i = -1;
while (++i < m)
{
var siLW = subjectLw[i];
if (!preparedQuery.CharCodes.Contains(siLW))
{
if (cscShouldRebuild)
{
j = -1;
while (++j < n)
{
cscRow[j] = 0;
}
cscShouldRebuild = false;
}
continue;
}
score = 0.0;
var scoreDiag = 0.0;
var cscDiag = 0.0;
var recordMiss = true;
cscShouldRebuild = true;
j = -1;
while (++j < n)
{
var scoreUp = scoreRow[j];
if (scoreUp > score)
{
score = scoreUp;
}
var cscScore = 0.0;
if (queryLw[j] == siLW)
{
var start = ScorerUtil.IsWordStart(i, subject, subjectLw);
if (cscDiag > 0)
{
cscScore = cscDiag;
}
else
{
cscScore = Scorer.ScoreConsecutives(subject, subjectLw, query, queryLw, i, j, start);
}
var align = scoreDiag + Scorer.ScoreCharacter(i, j, start, acroScore, cscScore);
if (align > score)
{
score = align;
missLeft = missBudget;
}
else
{
if (recordMiss && --missLeft <= 0)
{
return(Math.Max(score, scoreRow[n - 1]) * sz);
}
else
{
recordMiss = false;
}
}
}
scoreDiag = scoreUp;
cscDiag = cscRow[j];
cscRow[j] = cscScore;
scoreRow[j] = score;
}
}
score = scoreRow[n - 1];
return(score * sz);
}
