private void RenderContext(Diff.Hunk hunk)
{
Range left = hunk.Left;
Range right = hunk.Right;
int displayed = 0;
if (Result.Length > 0) // not the first hunk, adding context for previous change
{
displayed = Math.Min(ContextLines, right.Count);
for (int i = 0; i < displayed; i++)
{
ContextLine(right.Start + i);
}
}
int toDisplay = Math.Min(right.Count - displayed, ContextLines);
if ((left.End < LeftLines.Length - 1 || right.End < RightLines.Length - 1) && toDisplay > 0)
// not the last hunk, adding context for next change
{
if (right.Count > displayed + toDisplay)
{
ContextHeader(left.End - toDisplay + 1, right.End - toDisplay + 1);
}
for (int i = 0; i < toDisplay; i++)
{
ContextLine(right.End - toDisplay + i + 1);
}
}
}
private void RenderDifference(Diff.Hunk hunk)
{
Range left = hunk.Left;
Range right = hunk.Right;
if (right.Start == 0)
{
ContextHeader(0, 0);
}
int changes = Math.Min(left.Count, right.Count);
for (int i = 0; i < changes; i++)
{
LineChanged(left.Start + i, right.Start + i);
}
if (left.Count > right.Count)
{
for (int i = changes; i < left.Count; i++)
{
LineDeleted(left.Start + i, right.Start + changes);
}
}
else if (left.Count < right.Count)
{
for (int i = changes; i < right.Count; i++)
{
LineAdded(right.Start + i);
}
}
}
private static void WriteUnifiedDiffSection(TextWriter writer, ArrayList hunks)
{
Diff.Hunk first = (Diff.Hunk)hunks[0];
Diff.Hunk last = (Diff.Hunk)hunks[hunks.Count - 1];
writer.Write("@@ -");
writer.Write(first.Left.Start + 1);
writer.Write(",");
writer.Write(last.Left.End - first.Left.Start + 1);
writer.Write(" +");
writer.Write(first.Right.Start + 1);
writer.Write(",");
writer.Write(last.Right.End - first.Right.Start + 1);
writer.WriteLine(" @@");
foreach (Diff.Hunk hunk in hunks)
{
if (hunk.Same)
{
WriteBlock(writer, ' ', hunk.Left);
continue;
}
WriteBlock(writer, '-', hunk.Left);
WriteBlock(writer, '+', hunk.Right);
}
}
public static void WriteUnifiedDiff(Diff diff, TextWriter writer, string fromfile, string tofile, int context)
{
writer.Write("--- ");
writer.WriteLine(fromfile);
writer.Write("+++ ");
writer.WriteLine(tofile);
ArrayList hunkset = new ArrayList();
foreach (Diff.Hunk hunk in diff)
{
Diff.Hunk lasthunk = null;
if (hunkset.Count > 0)
{
lasthunk = (Diff.Hunk)hunkset[hunkset.Count - 1];
}
if (hunk.Same)
{
// At the start of a hunk set, keep only context lines of context.
if (lasthunk == null)
{
if (hunk.Left.Count > context)
{
hunkset.Add(hunk.Crop(hunk.Left.Count - context, 0));
}
else
{
hunkset.Add(hunk);
}
// Can't have two same hunks in a row, so the last one was a difference.
}
else
{
// Small enough context that this unified diff range will not stop.
if (hunk.Left.Count <= context * 2)
{
hunkset.Add(hunk);
// Too much of the same. Keep context lines and end this section.
// And then keep the last context lines as context for the next section.
}
else
{
hunkset.Add(hunk.Crop(0, hunk.Left.Count - context));
WriteUnifiedDiffSection(writer, hunkset);
hunkset.Clear();
if (hunk.Left.Count > context)
{
hunkset.Add(hunk.Crop(hunk.Left.Count - context, 0));
}
else
{
hunkset.Add(hunk);
}
}
}
}
else
{
hunkset.Add(hunk);
}
}
if (hunkset.Count > 0 && !(hunkset.Count == 1 && ((Diff.Hunk)hunkset[0]).Same))
{
WriteUnifiedDiffSection(writer, hunkset);
}
}