private VersionRange NeededRange(VersionRange alreadySearched, VersionRange possibleSubSet)
{
if (alreadySearched == null || _versionRangeComparer.Equals(alreadySearched, EmptyRange))
{
return(possibleSubSet);
}
if (_versionRangeComparer.Equals(possibleSubSet, EmptyRange))
{
return(EmptyRange);
}
// full overlap scenarios
if (possibleSubSet.IsSubSetOrEqualTo(alreadySearched))
{
return(EmptyRange);
}
else if (possibleSubSet.IsSubSetOrEqualTo(alreadySearched))
{
return(possibleSubSet);
}
// we need a partial range
// [ ]
// [ ]
if (possibleSubSet.HasLowerBound && alreadySearched.Satisfies(possibleSubSet.MinVersion))
{
// already searched the lower set
return(new VersionRange(possibleSubSet.MinVersion, possibleSubSet.IsMinInclusive,
alreadySearched.MaxVersion, alreadySearched.IsMaxInclusive,
possibleSubSet.IncludePrerelease || alreadySearched.IncludePrerelease));
}
else if (possibleSubSet.HasUpperBound && alreadySearched.Satisfies(possibleSubSet.MaxVersion))
{
// already searched the higher set
return(new VersionRange(alreadySearched.MinVersion, alreadySearched.IsMinInclusive,
possibleSubSet.MaxVersion, possibleSubSet.IsMaxInclusive,
possibleSubSet.IncludePrerelease || alreadySearched.IncludePrerelease));
}
else
{
// TODO: improve this
return(VersionRange.Combine(new VersionRange[] { alreadySearched, possibleSubSet }));
}
}