public override bool DeletePrevious()
{
ITextSnapshot snapshot = _textBuffer.AdvancedTextBuffer.CurrentSnapshot;
int previousPosition = CurrentPosition - 1;
if (previousPosition < 0)
{
return(true);
}
int index = previousPosition;
char currentCharacter = snapshot[previousPosition];
// By default VS (and many other apps) will delete only the last character
// of a combining character sequence. The one exception to this rule is
// surrogate pais which we are handling here.
if (char.GetUnicodeCategory(currentCharacter) == UnicodeCategory.Surrogate)
{
index--;
}
if (index > 0)
{
if (currentCharacter == '\n')
{
if (snapshot[previousPosition - 1] == '\r')
{
index--;
}
}
}
return(PrimitivesUtilities.Delete(_textBuffer.AdvancedTextBuffer, index, previousPosition - index + 1));
}
public override bool Capitalize()
{
int startPosition = _startPoint.CurrentPosition;
if (IsEmpty)
{
int endPosition = _endPoint.CurrentPosition;
TextRange currentWord = _startPoint.GetCurrentWord();
string nextCharacter = _startPoint.GetNextCharacter();
if (_startPoint.CurrentPosition == currentWord.GetStartPoint().CurrentPosition)
{
nextCharacter = nextCharacter.ToUpper(CultureInfo.CurrentCulture);
}
else
{
nextCharacter = nextCharacter.ToLower(CultureInfo.CurrentCulture);
}
if (!PrimitivesUtilities.Replace(TextBuffer.AdvancedTextBuffer, new Span(_startPoint.CurrentPosition, nextCharacter.Length), nextCharacter))
{
return(false);
}
_endPoint.MoveTo(endPosition);
}
else
{
using (ITextEdit edit = TextBuffer.AdvancedTextBuffer.CreateEdit())
{
TextRange currentWord = _startPoint.GetCurrentWord();
// If the current word extends past this range, go to the next word
if (currentWord.GetStartPoint().CurrentPosition < _startPoint.CurrentPosition)
{
currentWord = currentWord.GetEndPoint().GetNextWord();
}
while (currentWord.GetStartPoint().CurrentPosition < _endPoint.CurrentPosition)
{
string wordText = currentWord.GetText();
string startElement = StringInfo.GetNextTextElement(wordText);
wordText = startElement.ToUpper(CultureInfo.CurrentCulture) + wordText.Substring(startElement.Length).ToLower(CultureInfo.CurrentCulture);
if (!edit.Replace(currentWord.AdvancedTextRange.Span, wordText))
{
edit.Cancel();
return(false);
}
currentWord = currentWord.GetEndPoint().GetNextWord();
}
edit.Apply();
if (edit.Canceled)
{
return(false);
}
}
}
_startPoint.MoveTo(startPosition);
return(true);
}
public override bool DeleteNext()
{
if (_textView.AdvancedTextView.TextViewModel.IsPointInVisualBuffer(AdvancedTextPoint, PositionAffinity.Successor))
{
return(PrimitivesUtilities.Delete(GetNextTextElementSpan()));
}
else
{
return(_bufferPoint.DeleteNext());
}
}
public override bool InsertText(string text)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
if (text.Length > 0)
{
return(PrimitivesUtilities.Insert(_textBuffer.AdvancedTextBuffer, _trackingPoint.GetPosition(_textBuffer.AdvancedTextBuffer.CurrentSnapshot), text));
}
else
{
return(true);
}
}
public override bool TransposeCharacter()
{
int insertionIndex = CurrentPosition;
ITextSnapshotLine line = _textBuffer.AdvancedTextBuffer.CurrentSnapshot.GetLineFromPosition(insertionIndex);
string lineText = line.GetText();
if (StringInfo.ParseCombiningCharacters(lineText).Length < 2)
{
return(true);
}
Span textElementLeftSpan, textElementRightSpan;
string textElementLeft, textElementRight;
int linePosition = CurrentPosition - StartOfLine;
// We're at the start of a line
if (insertionIndex == line.Start)
{
textElementLeft = StringInfo.GetNextTextElement(lineText, linePosition);
textElementLeftSpan = new Span(linePosition + line.Start, textElementLeft.Length);
textElementRight = StringInfo.GetNextTextElement(lineText, linePosition + textElementLeft.Length);
textElementRightSpan = new Span(textElementLeftSpan.End, textElementRight.Length);
}
// We're at the end of a line
else if (insertionIndex == line.End)
{
textElementRight = StringInfo.GetNextTextElement(lineText, linePosition - 1);
textElementRightSpan = new Span(linePosition - 1 + line.Start, textElementRight.Length);
textElementLeft = StringInfo.GetNextTextElement(lineText, textElementRightSpan.Start - line.Start - 1);
textElementLeftSpan = new Span(textElementRightSpan.Start - 1, textElementRight.Length);
}
// We're at the middle of a line
else
{
textElementRight = StringInfo.GetNextTextElement(lineText, linePosition);
textElementRightSpan = new Span(linePosition + line.Start, textElementRight.Length);
textElementLeft = StringInfo.GetNextTextElement(lineText, textElementRightSpan.Start - line.Start - 1);
textElementLeftSpan = new Span(textElementRightSpan.Start - 1, textElementRight.Length);
}
string transposedText = textElementRight + textElementLeft;
return(PrimitivesUtilities.Replace(_textBuffer.AdvancedTextBuffer, new Span(textElementLeftSpan.Start, transposedText.Length), transposedText));
}
public override bool ReplaceText(string newText)
{
if (string.IsNullOrEmpty(newText))
{
throw new ArgumentNullException(nameof(newText));
}
int startPoint = _startPoint.CurrentPosition;
if (!PrimitivesUtilities.Replace(TextBuffer.AdvancedTextBuffer, Span.FromBounds(_startPoint.CurrentPosition, _endPoint.CurrentPosition), newText))
{
return(false);
}
_startPoint.MoveTo(startPoint);
return(true);
}
public override bool DeletePrevious()
{
SnapshotSpan previousElementSpan = GetPreviousTextElementSpan();
if ((previousElementSpan.Length > 0) &&
(_textView.AdvancedTextView.TextViewModel.IsPointInVisualBuffer(AdvancedTextPoint, PositionAffinity.Successor)) &&
(!_textView.AdvancedTextView.TextViewModel.IsPointInVisualBuffer(previousElementSpan.End - 1, PositionAffinity.Successor)))
{
// Since the previous character is not visible but the current one is, delete
// the entire previous text element span.
return(PrimitivesUtilities.Delete(previousElementSpan));
}
else
{
// Delegate to the buffer point's DeletePrevious implementation to handle deleting single
// characters. A single character should be deleted if this point and the previous one
// are both visible or both not visible.
return(_bufferPoint.DeletePrevious());
}
}
public override bool RemovePreviousIndent()
{
if (Column > 0)
{
int tabSize = _editorOptions.GetTabSize();
int previousTabStop = Column - tabSize;
if (Column % tabSize > 0)
{
previousTabStop = (Column / tabSize) * tabSize;
}
int positionToDeleteTo = CurrentPosition;
TextPoint newPoint = Clone();
for (int i = CurrentPosition - 1; newPoint.Column >= previousTabStop; i--)
{
newPoint.MoveTo(i);
string character = newPoint.GetNextCharacter();
if (!string.Equals(character, " ", StringComparison.Ordinal) && !string.Equals(character, "\t", StringComparison.Ordinal))
{
break;
}
positionToDeleteTo = i;
if (newPoint.Column == previousTabStop)
{
break;
}
}
return(PrimitivesUtilities.Delete(_textBuffer.AdvancedTextBuffer, Span.FromBounds(positionToDeleteTo, CurrentPosition)));
}
else
{
return(true);
}
}
public override bool TransposeCharacter()
{
SnapshotPoint insertionPoint = AdvancedTextPoint;
ITextSnapshotLine line = _textView.AdvancedTextView.TextSnapshot.GetLineFromPosition(insertionPoint);
string lineText = line.GetText();
if (StringInfo.ParseCombiningCharacters(lineText).Length < 2)
{
return(true);
}
SnapshotSpan textElementLeftSpan, textElementRightSpan;
// We're at the start of a line
if (insertionPoint == line.Start)
{
textElementLeftSpan = TextView.AdvancedTextView.GetTextElementSpan(insertionPoint);
textElementRightSpan = TextView.AdvancedTextView.GetTextElementSpan(textElementLeftSpan.End);
}
// We're at the end of a line
else if (insertionPoint == line.End)
{
textElementRightSpan = TextView.AdvancedTextView.GetTextElementSpan(insertionPoint - 1);
textElementLeftSpan = TextView.AdvancedTextView.GetTextElementSpan(textElementRightSpan.Start - 1);
}
// We're at the middle of a line
else
{
textElementRightSpan = TextView.AdvancedTextView.GetTextElementSpan(insertionPoint);
textElementLeftSpan = TextView.AdvancedTextView.GetTextElementSpan(textElementRightSpan.Start - 1);
}
string transposedText = _textView.AdvancedTextView.TextSnapshot.GetText(textElementRightSpan)
+ _textView.AdvancedTextView.TextSnapshot.GetText(textElementLeftSpan);
return(PrimitivesUtilities.Replace(TextBuffer.AdvancedTextBuffer, new Span(textElementLeftSpan.Start, transposedText.Length), transposedText));
}
public override bool DeleteNext()
{
string nextCharacter = GetNextCharacter();
return(PrimitivesUtilities.Delete(_textBuffer.AdvancedTextBuffer, CurrentPosition, nextCharacter.Length));
}
public override bool Delete()
{
return(PrimitivesUtilities.Delete(TextBuffer.AdvancedTextBuffer, Span.FromBounds(_startPoint.CurrentPosition, _endPoint.CurrentPosition)));
}