static Position previousIfPositionIsAfterLineBreak(const Position& position, HTMLElement* innerEditor)
{
if (position.isNull())
return Position();
// Move back if position is just after line break.
if (isHTMLBRElement(*position.anchorNode())) {
if (position.isAfterAnchor())
return Position(position.anchorNode(), PositionAnchorType::BeforeAnchor);
if (position.isBeforeAnchor())
return previousIfPositionIsAfterLineBreak(endOfPrevious(*position.anchorNode(), innerEditor), innerEditor);
// We don't place caret into BR element, since well-formed BR element
// doesn't have child nodes.
ASSERT_NOT_REACHED();
return position;
}
if (!position.anchorNode()->isTextNode())
return position;
Text* textNode = toText(position.anchorNode());
unsigned offset = position.offsetInContainerNode();
if (textNode->length() == 0 || offset == 0)
return previousIfPositionIsAfterLineBreak(endOfPrevious(*position.anchorNode(), innerEditor), innerEditor);
if (offset <= textNode->length() && textNode->data()[offset - 1] == '\n')
return Position(textNode, offset - 1);
return position;
}
static Position previousIfPositionIsAfterLineBreak(const Position& position, HTMLElement* innerEditor)
{
if (position.isNull())
return Position();
// Move back if position is just after line break.
if (isHTMLBRElement(*position.anchorNode())) {
switch (position.anchorType()) {
case Position::PositionIsAfterAnchor:
return Position(position.anchorNode(), Position::PositionIsBeforeAnchor);
case Position::PositionIsBeforeAnchor:
return previousIfPositionIsAfterLineBreak(endOfPrevious(*position.anchorNode(), innerEditor), innerEditor);
default:
ASSERT_NOT_REACHED();
}
} else if (position.anchorNode()->isTextNode()) {
Text* textNode = toText(position.anchorNode());
unsigned offset = position.offsetInContainerNode();
if (textNode->length() == 0 || offset == 0) {
return previousIfPositionIsAfterLineBreak(endOfPrevious(*position.anchorNode(), innerEditor), innerEditor);
}
if (offset <= textNode->length() && textNode->data()[offset - 1] == '\n') {
return Position(textNode, offset - 1);
}
}
return position;
}
