public static DiffChain ConstructBackwardDiffChain(FileSnapshot a, FileSnapshot next, int right)
{
DiffChain backward = new DiffChain();
backward.Start = right;
backward.StartSnap = next;
backward.EndSnap = a;
backward.End = null;
int?left = next.GetRightToLeft(right); // left is a's right
if (left == null)
{
backward.Kind = DiffChainType.Null;
return(backward);
}
//left++; // backward chaining drift?
var aStatus = backward.RightFromLeftStatus(a, left.Value);
var nextStatus = backward.SelfStatusFromRight(next, right);
var chainType = backward.DetermineChainType(aStatus, nextStatus);
backward.Kind = chainType;
backward.End = left;
return(backward);
}
public static DiffChain ConstructForwardDiffChain(FileSnapshot a, FileSnapshot next, int right)
{
try
{
var chain = new DiffChain()
{
};
var aStatus = chain.SelfStatusFromRight(a, right);
var nextStatus = chain.LeftFromRightStatus(next, right);
var chainType = chain.DetermineChainType(aStatus, nextStatus);
chain.Kind = chainType;
chain.Start = right;
chain.End = next.GetLeftToRight(right);
chain.StartSnap = a;
chain.EndSnap = next;
return(chain);
}
catch (Exception ex)
{
Trace.WriteLine(ex.Message);
return(null);
}
}
