static void RemoveCharBeforeCaret(TextEditorData data)
{
int offset = data.Caret.Offset;
if (offset <= 0)
{
return;
}
var version = data.Version;
var o = data.Caret.Offset;
if (CaretMoveActions.IsLowSurrogateMarkerSet(data.GetCharAt(offset - 1)))
{
data.Remove(offset - 2, 2);
}
else
{
data.Remove(offset - 1, 1);
}
data.Caret.Location = data.OffsetToLocation(version.MoveOffsetTo(data.Version, offset));
}
public SnapshotSpan GetTextElementSpan(SnapshotPoint bufferPosition)
{
bufferPosition = this.FixBufferPosition(bufferPosition);
if (!this.ContainsBufferPosition(bufferPosition))
{
throw new ArgumentOutOfRangeException(nameof(bufferPosition));
}
if (bufferPosition >= ExtentIncludingLineBreak.End - LineBreakLength)
{
return(new SnapshotSpan(ExtentIncludingLineBreak.End - LineBreakLength, LineBreakLength));
}
var line = textEditor.GetLineByOffset(bufferPosition.Position);
var lineOffset = line.Offset;
var highlightedLine = this.textEditor.Document.SyntaxMode.GetHighlightedLineAsync(line, default(CancellationToken)).WaitAndGetResult();
if (highlightedLine != null)
{
foreach (var seg in highlightedLine.Segments)
{
if (seg.Contains(bufferPosition - lineOffset))
{
return(new SnapshotSpan(bufferPosition.Snapshot, lineOffset + seg.Offset, seg.Length));
}
}
}
var c = textEditor.GetCharAt(bufferPosition.Position);
if (CaretMoveActions.IsLowSurrogateMarkerSet(c))
{
return(new SnapshotSpan(bufferPosition.Snapshot, bufferPosition.Position, 2));
}
if (CaretMoveActions.IsHighSurrogateMarkerSet(c))
{
return(new SnapshotSpan(bufferPosition.Snapshot, bufferPosition.Position - 1, 2));
}
return(new SnapshotSpan(bufferPosition, 1));
}
public static void InsertNewLine(TextEditorData data)
{
if (!data.CanEditSelection)
{
return;
}
using (var undo = data.OpenUndoGroup()) {
if (data.IsSomethingSelected)
{
var end = data.MainSelection.End;
data.DeleteSelectedText();
if (end.Column == 1)
{
CaretMoveActions.InternalCaretMoveHome(data, true, false);
return;
}
}
switch (data.Options.IndentStyle)
{
case IndentStyle.None:
data.InsertAtCaret(data.EolMarker);
break;
case IndentStyle.Auto:
data.EnsureCaretIsNotVirtual();
var indent = data.Document.GetLineIndent(data.Caret.Line);
data.InsertAtCaret(data.EolMarker);
data.EnsureCaretIsNotVirtual();
if (data.GetLine(data.Caret.Line).Length == 0)
{
data.InsertAtCaret(indent);
}
break;
case IndentStyle.Smart:
if (!data.HasIndentationTracker)
{
goto case IndentStyle.Auto;
}
NewLineSmartIndent(data);
break;
case IndentStyle.Virtual:
if (!data.HasIndentationTracker)
{
goto case IndentStyle.Auto;
}
var oldLine = data.Caret.Line;
var curLine = data.GetLine(oldLine);
var indentCol = data.GetVirtualIndentationColumn(data.Caret.Location);
if (curLine.Length >= data.Caret.Column)
{
NewLineSmartIndent(data);
data.FixVirtualIndentation();
data.FixVirtualIndentation(oldLine);
break;
}
data.Insert(data.Caret.Offset, data.EolMarker);
data.FixVirtualIndentation(oldLine);
data.Caret.Column = indentCol;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
public static void Delete(TextEditorData data)
{
if (!data.CanEditSelection)
{
return;
}
using (var undoGroup = data.OpenUndoGroup()) {
if (data.IsSomethingSelected)
{
// case: zero width block selection
if (data.MainSelection.SelectionMode == SelectionMode.Block && data.MainSelection.Anchor.Column == data.MainSelection.Lead.Column)
{
var col = data.MainSelection.Lead.Column;
if (col <= DocumentLocation.MinColumn)
{
data.ClearSelection();
return;
}
bool preserve = data.Caret.PreserveSelection;
data.Caret.PreserveSelection = true;
col--;
var changes = new List <Microsoft.CodeAnalysis.Text.TextChange> ();
for (int lineNumber = data.MainSelection.MinLine; lineNumber <= data.MainSelection.MaxLine; lineNumber++)
{
DocumentLine lineSegment = data.Document.GetLine(lineNumber);
if (col < lineSegment.Length)
{
changes.Add(new Microsoft.CodeAnalysis.Text.TextChange(new Microsoft.CodeAnalysis.Text.TextSpan(lineSegment.Offset + col, 1), ""));
}
}
data.Document.ApplyTextChanges(changes);
data.Caret.PreserveSelection = preserve;
data.Document.CommitMultipleLineUpdate(data.MainSelection.MinLine, data.MainSelection.MaxLine);
return;
}
data.DeleteSelectedText(data.MainSelection.SelectionMode != SelectionMode.Block);
return;
}
if (data.Caret.Offset >= data.Document.Length)
{
return;
}
data.EnsureCaretIsNotVirtual();
DocumentLine line = data.Document.GetLine(data.Caret.Line);
if (data.Caret.Column == line.Length + 1)
{
if (data.Caret.Line < data.Document.LineCount)
{
var deletionLength = line.DelimiterLength;
// smart backspace (delete indentation)
if (data.Options.IndentStyle == IndentStyle.Smart || data.Options.IndentStyle == IndentStyle.Virtual)
{
var next = line.NextLine;
if (next != null)
{
if (data.HasIndentationTracker)
{
var lineIndentation = next.GetIndentation(data.Document);
if (lineIndentation.StartsWith(data.IndentationTracker.GetIndentationString(next.LineNumber)))
{
deletionLength += lineIndentation.Length;
}
}
}
}
data.Remove(line.EndOffsetIncludingDelimiter - line.DelimiterLength, deletionLength);
if (line.EndOffsetIncludingDelimiter == data.Document.Length)
{
line.UnicodeNewline = UnicodeNewline.Unknown;
}
}
}
else
{
var o = data.Caret.Offset;
if (CaretMoveActions.IsHighSurrogateMarkerSet(data.GetCharAt(o)))
{
data.Remove(o, 2);
}
else
{
data.Remove(o, 1);
}
data.Document.CommitLineUpdate(data.Caret.Line);
}
data.FixVirtualIndentation();
}
}