private void UndoStack_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case nameof(this._document.UndoStack.SizeLimit):
// HACK: UndoStack のサイズ変更を起点にファイルのリロードを検知
// たまたま ViewModel 側でサスペンドしているため実現できるが、
// 内部実装レベルで依存しており条件として非常に脆い。
this._baseDocument = new(this._document);
break;
case nameof(this._document.UndoStack.IsOriginalFile) when this._document.UndoStack.IsOriginalFile:
break;
default:
return;
}
try
{
this.ChangeList.Clear();
this.ChangeList.Add(LineChangeInfo.Empty);
var lastEnd = 0;
var diff = new MyersDiffAlgorithm(this._baseDocument, this._document);
foreach (var edit in diff.Edits)
{
var change = new LineChangeInfo(edit.Change, edit.BeginA, edit.EndA);
this.ChangeList.InsertRange(this.ChangeList.Count, edit.BeginB - lastEnd, LineChangeInfo.Empty);
if (edit.EndB == edit.BeginB)
{
this.ChangeList[^ 1] = change;
void ReloadDocument(TextDocument document, string newContent)
{
var diff = new MyersDiffAlgorithm(new StringSequence(document.Text), new StringSequence(newContent));
document.Replace(0, document.TextLength, newContent, diff.GetEdits().ToOffsetChangeMap());
document.UndoStack.ClearAll();
}
void SetupInitialFileState(bool update)
{
if (baseDocument == null)
{
if (update)
{
changeList.Transform(TransformLineChangeInfo);
}
else
{
changeList.InsertRange(0, document.LineCount + 1, LineChangeInfo.EMPTY);
}
}
else
{
changeList.Clear();
Dictionary <string, int> hashes = new Dictionary <string, int>();
MyersDiffAlgorithm diff = new MyersDiffAlgorithm(
new DocumentSequence(baseDocument, hashes),
new DocumentSequence(document, hashes)
);
changeList.Add(LineChangeInfo.EMPTY);
int lastEndLine = 0;
foreach (Edit edit in diff.GetEdits())
{
int beginLine = edit.BeginB;
int endLine = edit.EndB;
changeList.InsertRange(changeList.Count, beginLine - lastEndLine, LineChangeInfo.EMPTY);
if (endLine == beginLine)
{
changeList[changeList.Count - 1] = new LineChangeInfo(edit.EditType, edit.BeginA, edit.EndA);
}
else
{
changeList.InsertRange(changeList.Count, endLine - beginLine, new LineChangeInfo(edit.EditType, edit.BeginA, edit.EndA));
}
lastEndLine = endLine;
}
changeList.InsertRange(changeList.Count, textDocument.LineCount - lastEndLine, LineChangeInfo.EMPTY);
}
OnChangeOccurred(EventArgs.Empty);
}
void ReloadDocument(TextDocument document, string newContent)
{
var diff = new MyersDiffAlgorithm(new StringSequence(document.Text), new StringSequence(newContent));
document.Replace(0, document.TextLength, newContent, diff.GetEdits().ToOffsetChangeMap());
if (this.ClearUndoStackOnSwitch || documentFirstLoad)
{
document.UndoStack.ClearAll();
}
if (documentFirstLoad)
{
documentFirstLoad = false;
}
}
public Patch(string exExpected, string exActual)
{
_a = new StringLinesSequence(exExpected ?? string.Empty);
_b = new StringLinesSequence(exActual ?? string.Empty);
_ma = new MyersDiffAlgorithm(_a, _b);
}