public static void HandleAutoformat(ITextView textView, char typedChar)
{
if (!REditorSettings.AutoFormat)
{
return;
}
if (!REditorSettings.FormatScope && typedChar == '}')
{
return;
}
SnapshotPoint?rPoint = GetCaretPointInBuffer(textView);
if (!rPoint.HasValue)
{
return;
}
var document = REditorDocument.FromTextBuffer(textView.TextBuffer);
var ast = document.EditorTree.AstRoot;
// Make sure we are not formatting damaging the projected range in R Markdown
// which looks like ```{r. 'r' should not separate from {.
var host = ContainedLanguageHost.GetHost(textView, document.TextBuffer);
if (host != null && !host.CanFormatLine(textView, document.TextBuffer, document.TextBuffer.CurrentSnapshot.GetLineNumberFromPosition(rPoint.Value)))
{
return;
}
// We don't want to auto-format inside strings
if (ast.IsPositionInsideString(rPoint.Value.Position))
{
return;
}
ITextBuffer subjectBuffer = rPoint.Value.Snapshot.TextBuffer;
if (typedChar.IsLineBreak())
{
// Special case for hitting caret after } and before 'else'. We do want to format
// the construct as '} else {' but if user types Enter after } and we auto-format
// it will look as if the editor just eats the Enter. Instead, we will not be
// autoformatting in this specific case. User can always format either the document
// or select the block and reformat it.
if (!IsBetweenCurlyAndElse(subjectBuffer, rPoint.Value.Position))
{
var scopeStatement = GetFormatScope(textView, subjectBuffer, ast);
// Do not format large scope blocks for performance reasons
if (scopeStatement != null && scopeStatement.Length < 200)
{
FormatOperations.FormatNode(textView, subjectBuffer, scopeStatement);
}
else
{
FormatOperations.FormatCurrentLine(textView, subjectBuffer);
}
}
}
else if (typedChar == ';')
{
// Verify we are at the end of the string and not in a middle
// of another string or inside a statement.
ITextSnapshotLine line = subjectBuffer.CurrentSnapshot.GetLineFromPosition(rPoint.Value.Position);
int positionInLine = rPoint.Value.Position - line.Start;
string lineText = line.GetText();
if (positionInLine >= lineText.TrimEnd().Length)
{
FormatOperations.FormatCurrentLine(textView, subjectBuffer);
}
}
else if (typedChar == '}')
{
FormatOperations.FormatCurrentStatement(textView, subjectBuffer, limitAtCaret: true, caretOffset: -1);
}
}
