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);
}
protected DiffChainCapType RightFromLeftStatus(FileSnapshot snapshot, int otherLeft)
{
// Transform to local index.
int localRight = otherLeft;
// TODO: Is this bounded at end?
var difference = snapshot.Differences.Where(d => localRight >= d.Right.Start && localRight < d.Right.Start + d.Right.Length).SingleOrDefault();
if (difference == null)
{
return(DiffChainCapType.Bottom);
}
if (difference.DifferenceType == DifferenceType.Add)
{
// Transduce to bottom.
//return DiffChainCapType.Bottom;
return(DiffChainCapType.Add);
}
if (difference.DifferenceType == DifferenceType.Change)
{
return(DiffChainCapType.Mod);
}
if (difference.DifferenceType == DifferenceType.Remove)
{
return(DiffChainCapType.Del);
}
throw new ArgumentException("Invalid argument to RightToLeftStatus");
}
protected DiffChainCapType SelfStatusFromRight(FileSnapshot snapshot, int right)
{
int localRight = right;
var difference = snapshot.Differences.Where(d => localRight >= d.Right.Start && localRight < d.Right.Start + d.Right.Length).SingleOrDefault();
if (difference == null)
{
difference = snapshot.Differences.Where(d => d.DifferenceType == DifferenceType.Remove && d.Right.Start == localRight).SingleOrDefault();
}
if (difference == null)
{
return(DiffChainCapType.Bottom);
}
if (difference.DifferenceType == DifferenceType.Add)
{
// Transduce to bottom.
//return DiffChainCapType.Bottom;
return(DiffChainCapType.Add);
}
if (difference.DifferenceType == DifferenceType.Change)
{
return(DiffChainCapType.Mod);
}
if (difference.DifferenceType == DifferenceType.Remove)
{
return(DiffChainCapType.Del);
}
throw new ArgumentException("Invalid argument to RightToLeftStatus");
}
protected DiffChainCapType LeftFromRightStatus(FileSnapshot snapshot, int otherRight)
{
// Transform to local index.
int localLeft = otherRight;
var difference = snapshot.Differences.Where(d => localLeft >= d.Left.Start && localLeft < d.Left.Start + d.Left.Length).SingleOrDefault();
if (difference == null)
{
difference = snapshot.Differences.Where(d => d.DifferenceType == DifferenceType.Add && d.Left.Start == localLeft).SingleOrDefault();
}
if (difference == null)
{
return(DiffChainCapType.Bottom);
}
if (difference.DifferenceType == DifferenceType.Add)
{
// Transduce to bottom.
//return DiffChainCapType.Bottom;
return(DiffChainCapType.Add);
}
if (difference.DifferenceType == DifferenceType.Change)
{
return(DiffChainCapType.Mod);
}
if (difference.DifferenceType == DifferenceType.Remove)
{
return(DiffChainCapType.Del);
}
throw new ArgumentException("Invalid argument to LeftToRightStatus");
}
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);
}
}
public static void Main(String[] args)
{
FileSnapshot snapshot = new FileSnapshot("test.cs");
Difference d = new Difference()
{
Left = new Span()
{
Start = 0, Length = 2
},
Right = new Span()
{
Start = 0, Length = 4
}
};
snapshot.LeftTextLines = new String[]
{
"Difference d = new Difference(new VisualStudio.Text.Span(0,2), new VisualStudio.Text.Span(0,4), null, null );\n",
"}"
}.ToList();
snapshot.RightTextLines = new String[]
{
"Difference d = new Difference(new VisualStudio.Text.Span(0,2), new VisualStudio.Text.Span(0,4), null, null );\n",
"\n",
"// Hello bob\n",
"}"
}.ToList();
var dict = snapshot.ForwardMatchChangeLinesAcrossDiff(d);
foreach (var entry in dict)
{
Console.WriteLine(entry.Key + ":" + entry.Value);
}
}