// This avoids the expense of a full fledged delete operation, and avoids a layout that typically results
// from text removal.
bool InsertTextCommand::performTrivialReplace(const String& text, bool selectInsertedText)
{
if (!endingSelection().isRange())
return false;
if (text.contains('\t') || text.contains(' ') || text.contains('\n'))
return false;
Position start = endingSelection().start();
Position end = endingSelection().end();
if (start.node() != end.node() || !start.node()->isTextNode() || isTabSpanTextNode(start.node()))
return false;
replaceTextInNode(static_cast<Text*>(start.node()), start.offset(), end.offset() - start.offset(), text);
Position endPosition(start.node(), start.offset() + text.length());
// We could have inserted a part of composed character sequence,
// so we are basically treating ending selection as a range to avoid validation.
// <http://bugs.webkit.org/show_bug.cgi?id=15781>
Selection forcedEndingSelection;
forcedEndingSelection.setWithoutValidation(start, endPosition);
setEndingSelection(forcedEndingSelection);
if (!selectInsertedText)
setEndingSelection(Selection(endingSelection().visibleEnd()));
return true;
}
bool InsertTextCommand::performOverwrite(const String& text, bool selectInsertedText)
{
Position start = endingSelection().start();
RefPtrWillBeRawPtr<Text> textNode = start.containerText();
if (!textNode)
return false;
unsigned count = std::min(text.length(), textNode->length() - start.offsetInContainerNode());
if (!count)
return false;
replaceTextInNode(textNode, start.offsetInContainerNode(), count, text);
Position endPosition = Position(textNode.release(), start.offsetInContainerNode() + text.length());
setEndingSelectionWithoutValidation(start, endPosition);
if (!selectInsertedText)
setEndingSelection(VisibleSelection(endingSelection().visibleEnd(), endingSelection().isDirectional()));
return true;
}