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LibWeb: Improve the line breaking algorithm

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Check the width of the next token after white space to decide line
breaks. The next width can also be the total width of multiple tokens.
This better follows the CSS Text specification and matches behavior of
other browsers.

Fixes #20388.
This commit is contained in:
Andi Gallo 2023-08-19 03:36:53 +00:00 • committed by Andreas Kling
parent 33b133d3f4
commit 3d7e788981
9 changed files with 227 additions and 13 deletions
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37
Userland/Libraries/LibWeb/Layout/InlineLevelIterator.cpp
View file

@ -125,6 +125,37 @@ void InlineLevelIterator::skip_to_next()
}
Optional<InlineLevelIterator::Item> InlineLevelIterator::next()
{
if (m_lookahead_items.is_empty())
return next_without_lookahead();
return m_lookahead_items.dequeue();
}
CSSPixels InlineLevelIterator::next_non_whitespace_sequence_width()
{
CSSPixels next_width = 0;
for (;;) {
auto next_item_opt = next_without_lookahead();
if (!next_item_opt.has_value())
break;
m_lookahead_items.enqueue(next_item_opt.release_value());
auto& next_item = m_lookahead_items.tail();
if (next_item.node->computed_values().white_space() != CSS::WhiteSpace::Nowrap) {
if (next_item.type != InlineLevelIterator::Item::Type::Text)
break;
if (next_item.is_collapsible_whitespace)
break;
auto& next_text_node = verify_cast<Layout::TextNode>(*(next_item.node));
auto next_view = next_text_node.text_for_rendering().substring_view(next_item.offset_in_node, next_item.length_in_node);
if (next_view.is_whitespace())
break;
}
next_width += next_item.border_box_width();
}
return next_width;
}
Optional<InlineLevelIterator::Item> InlineLevelIterator::next_without_lookahead()
{
if (!m_current_node)
return {};
@ -139,7 +170,7 @@ Optional<InlineLevelIterator::Item> InlineLevelIterator::next()
if (!chunk_opt.has_value()) {
m_text_node_context = {};
skip_to_next();
return next();
return next_without_lookahead();
}
m_text_node_context->next_chunk = m_text_node_context->chunk_iterator.next();
@ -200,12 +231,12 @@ Optional<InlineLevelIterator::Item> InlineLevelIterator::next()
if (is<Layout::ListItemMarkerBox>(*m_current_node)) {
skip_to_next();
return next();
return next_without_lookahead();
}
if (!is<Layout::Box>(*m_current_node)) {
skip_to_next();
return next();
return next_without_lookahead();
}
if (is<Layout::ReplacedBox>(*m_current_node)) {