private static int FindMatchLength(string source, string searchValue, int searchIndex, int searchLength, StringComparison comparisonType, int matchIndex)
{
int matchLengthMaximum = searchLength - (matchIndex - searchIndex);
int matchLengthInitial = Math.Min(searchValue.Length, matchLengthMaximum);
// Hot path: match length is same as specified search string
if (Substring.CompareInner(source, matchIndex, matchLengthInitial, searchValue, 0, searchValue.Length, comparisonType) == 0)
{
return(matchLengthInitial);
}
int matchLengthDecrementing = matchLengthInitial - 1;
int matchLengthIncrementing = matchLengthInitial + 1;
while (matchLengthDecrementing >= 0 || matchLengthIncrementing <= matchLengthMaximum)
{
if (matchLengthDecrementing >= 0)
{
if (Substring.CompareInner(source, matchIndex, matchLengthDecrementing, searchValue, 0, searchValue.Length, comparisonType) == 0)
{
return(matchLengthDecrementing);
}
matchLengthDecrementing--;
}
if (matchLengthIncrementing <= matchLengthMaximum)
{
if (Substring.CompareInner(source, matchIndex, matchLengthIncrementing, searchValue, 0, searchValue.Length, comparisonType) == 0)
{
return(matchLengthIncrementing);
}
matchLengthIncrementing++;
}
}
// Should never happen
return(-1);
}