private static Dictionary <string, Diff> CompareTags(Descriptor target, Tags oldTags, Tags newTags)
{
var tagChanges = new Dictionary <string, Diff>();
oldTags.ClearBadData();
newTags.ClearBadData();
// Record tags that were added.
Tags addTags = new Tags(newTags.Except(oldTags));
if (addTags.Count > 0)
{
string signature = addTags.Signature;
Diff diffAdd = Added(signature + " to", target, false);
diffAdd.Context = addTags;
tagChanges.Add('+' + signature, diffAdd);
}
// Record tags that were removed.
Tags removeTags = new Tags(oldTags.Except(newTags));
if (removeTags.Count > 0)
{
string signature = removeTags.Signature;
Diff diffRemove = Removed(signature + " from", target);
diffRemove.Context = removeTags;
tagChanges.Add('-' + signature, diffRemove);
}
return(tagChanges);
}