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);
}
}
private void AddHunk(int lcount, int rcount, bool same)
{
if (hunks.Count > 0 && same == ((Diff.Hunk)hunks[hunks.Count - 1]).Same)
{
Diff.Hunk prev = (Diff.Hunk)hunks[hunks.Count - 1];
hunks[hunks.Count - 1] = new Diff.Hunk(
leftlist,
rightlist,
prev.Left.Start,
prev.Left.End + lcount,
prev.Right.Start,
prev.Right.End + rcount,
same);
return;
}
int le = -1;
int re = -1;
if (hunks.Count > 0)
{
Diff.Hunk prev = (Diff.Hunk)hunks[hunks.Count - 1];
le = prev.Left.End;
re = prev.Right.End;
}
hunks.Add(new Diff.Hunk(
leftlist,
rightlist,
le + 1,
le + lcount,
re + 1,
re + rcount,
same));
}
public Merge(IDiff[] diffs) {
this.diffs = diffs;
// initialize data structures
IEnumerator[] enumerators = new IEnumerator[diffs.Length];
ArrayList[] hunks = new ArrayList[diffs.Length];
for (int i = 0; i < hunks.Length; i++) {
enumerators[i] = ((IEnumerable)diffs[i]).GetEnumerator();
hunks[i] = new ArrayList();
}
int startline = 0;
while (true) {
int endline = -1;
bool hasmore = false;
// Get the next hunk for each diff, and find the longest
// hunk for which there are changes.
for (int i = 0; i < hunks.Length; i++) {
if (hunks[i].Count > 0) continue;
if (!enumerators[i].MoveNext()) return;
hasmore = true;
Diff.Hunk hunk = (Diff.Hunk)enumerators[i].Current;
hunks[i].Add(hunk);
if (!hunk.Same && hunk.Left.End > endline)
endline = hunk.Left.End;
}
if (!hasmore) return;
if (endline == -1) {
// All of the hunks represented no change. Find the shortest hunk,
// create a hunk from the current start line to the end of the
// shortest hunk, and retain all of the hunks that overlap into that
// hunk's next region. (Clear the rest.)
int start = int.MaxValue;
for (int i = 0; i < hunks.Length; i++) {
Diff.Hunk h = (Diff.Hunk)hunks[i][0];
if (h.Left.End < start) start = h.Left.End;
}
// Crop all of the hunks to the shortest region.
Diff.Hunk[][] h2 = new Diff.Hunk[hunks.Length][];
for (int i = 0; i < hunks.Length; i++) {
h2[i] = new Diff.Hunk[1];
h2[i][0] = (Diff.Hunk)hunks[i][0];
h2[i][0] = h2[i][0].Crop(startline - h2[i][0].Left.Start, h2[i][0].Left.End - start);
}
this.hunks.Add( new Hunk(this, h2, startline, start - startline + 1, true) );
for (int i = 0; i < hunks.Length; i++) {
Diff.Hunk h = (Diff.Hunk)hunks[i][0];
if (h.Left.End == start) hunks[i].Clear();
}
startline = start+1;
continue;
}
// For each diff, add in all of the non-same hunks that fall
// at least partially within the largest hunk region. If
// a hunk crosses the edge, push the edge further and then
// add more hunks again.
bool moreToAdd = true;
while (moreToAdd) {
moreToAdd = false;
for (int i = 0; i < hunks.Length; i++) {
Diff.Hunk last = (Diff.Hunk)hunks[i][hunks[i].Count-1];
while (last.Left.End < endline) {
if (!enumerators[i].MoveNext()) continue;
last = (Diff.Hunk)enumerators[i].Current;
hunks[i].Add(last);
if (last.Same) continue;
if (last.Left.End > endline) {
endline = last.Left.End;
moreToAdd = true;
}
}
}
}
Diff.Hunk[][] hunks2 = new Diff.Hunk[hunks.Length][];
for (int i = 0; i < hunks.Length; i++) {
// any same hunks that overlap the start or end need to be replaced
ArrayList hunks3 = new ArrayList();
foreach (Diff.Hunk h in hunks[i]) {
Diff.Hunk h2 = h;
int shiftstart = 0, shiftend = 0;
if (h2.Same && h2.Left.Start < startline)
shiftstart = startline - h2.Left.Start;
if (h2.Same && h2.Left.End > endline)
shiftend = h2.Left.End - endline;
if (shiftstart != 0 || shiftend != 0)
h2 = h2.Crop(shiftstart, shiftend);
hunks3.Add(h2);
}
hunks2[i] = (Diff.Hunk[])hunks3.ToArray(typeof(Diff.Hunk));
}
this.hunks.Add( new Hunk(this, hunks2, startline, endline - startline + 1, false) );
// In each hunk list, retain only the last hunk if it
// overlaps into the next region.
startline = endline+1;
for (int i = 0; i < hunks.Length; i++) {
if (hunks[i].Count == 0) continue;
Diff.Hunk h = (Diff.Hunk)hunks[i][hunks[i].Count-1];
hunks[i].Clear();
if (h.Left.End >= startline)
hunks[i].Add(h);
}
}
}
public Merge(IDiff[] diffs)
{
this.diffs = diffs;
// initialize data structures
IEnumerator[] enumerators = new IEnumerator[diffs.Length];
ArrayList[] hunks = new ArrayList[diffs.Length];
for (int i = 0; i < hunks.Length; i++)
{
enumerators[i] = ((IEnumerable)diffs[i]).GetEnumerator();
hunks[i] = new ArrayList();
}
int startline = 0;
while (true)
{
int endline = -1;
bool hasmore = false;
// Get the next hunk for each diff, and find the longest
// hunk for which there are changes.
for (int i = 0; i < hunks.Length; i++)
{
if (hunks[i].Count > 0)
{
continue;
}
if (!enumerators[i].MoveNext())
{
return;
}
hasmore = true;
Diff.Hunk hunk = (Diff.Hunk)enumerators[i].Current;
hunks[i].Add(hunk);
if (!hunk.Same && hunk.Left.End > endline)
{
endline = hunk.Left.End;
}
}
if (!hasmore)
{
return;
}
if (endline == -1)
{
// All of the hunks represented no change. Find the shortest hunk,
// create a hunk from the current start line to the end of the
// shortest hunk, and retain all of the hunks that overlap into that
// hunk's next region. (Clear the rest.)
int start = int.MaxValue;
for (int i = 0; i < hunks.Length; i++)
{
Diff.Hunk h = (Diff.Hunk)hunks[i][0];
if (h.Left.End < start)
{
start = h.Left.End;
}
}
// Crop all of the hunks to the shortest region.
Diff.Hunk[][] h2 = new Diff.Hunk[hunks.Length][];
for (int i = 0; i < hunks.Length; i++)
{
h2[i] = new Diff.Hunk[1];
h2[i][0] = (Diff.Hunk)hunks[i][0];
h2[i][0] = h2[i][0].Crop(startline - h2[i][0].Left.Start, h2[i][0].Left.End - start);
}
this.hunks.Add(new Hunk(this, h2, startline, start - startline + 1, true));
for (int i = 0; i < hunks.Length; i++)
{
Diff.Hunk h = (Diff.Hunk)hunks[i][0];
if (h.Left.End == start)
{
hunks[i].Clear();
}
}
startline = start + 1;
continue;
}
// For each diff, add in all of the non-same hunks that fall
// at least partially within the largest hunk region. If
// a hunk crosses the edge, push the edge further and then
// add more hunks again.
bool moreToAdd = true;
while (moreToAdd)
{
moreToAdd = false;
for (int i = 0; i < hunks.Length; i++)
{
Diff.Hunk last = (Diff.Hunk)hunks[i][hunks[i].Count - 1];
while (last.Left.End < endline)
{
if (!enumerators[i].MoveNext())
{
continue;
}
last = (Diff.Hunk)enumerators[i].Current;
hunks[i].Add(last);
if (last.Same)
{
continue;
}
if (last.Left.End > endline)
{
endline = last.Left.End;
moreToAdd = true;
}
}
}
}
Diff.Hunk[][] hunks2 = new Diff.Hunk[hunks.Length][];
for (int i = 0; i < hunks.Length; i++)
{
// any same hunks that overlap the start or end need to be replaced
ArrayList hunks3 = new ArrayList();
foreach (Diff.Hunk h in hunks[i])
{
Diff.Hunk h2 = h;
int shiftstart = 0, shiftend = 0;
if (h2.Same && h2.Left.Start < startline)
{
shiftstart = startline - h2.Left.Start;
}
if (h2.Same && h2.Left.End > endline)
{
shiftend = h2.Left.End - endline;
}
if (shiftstart != 0 || shiftend != 0)
{
h2 = h2.Crop(shiftstart, shiftend);
}
hunks3.Add(h2);
}
hunks2[i] = (Diff.Hunk[])hunks3.ToArray(typeof(Diff.Hunk));
}
this.hunks.Add(new Hunk(this, hunks2, startline, endline - startline + 1, false));
// In each hunk list, retain only the last hunk if it
// overlaps into the next region.
startline = endline + 1;
for (int i = 0; i < hunks.Length; i++)
{
if (hunks[i].Count == 0)
{
continue;
}
Diff.Hunk h = (Diff.Hunk)hunks[i][hunks[i].Count - 1];
hunks[i].Clear();
if (h.Left.End >= startline)
{
hunks[i].Add(h);
}
}
}
}
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);
}
}
