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LibWeb: Add spec comments to find_appropriate_place_for_inserting_node()

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This commit is contained in:
Andreas Kling 2022-02-14 22:19:34 +01:00
parent da374a82bc
commit 6fe333607d
1 changed files with 24 additions and 4 deletions
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28
Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
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@ -516,29 +516,49 @@ DOM::Element& HTMLParser::node_before_current_node()
return m_stack_of_open_elements.elements().at(m_stack_of_open_elements.elements().size() - 2);
}
// https://html.spec.whatwg.org/multipage/parsing.html#appropriate-place-for-inserting-a-node
HTMLParser::AdjustedInsertionLocation HTMLParser::find_appropriate_place_for_inserting_node()
{
auto& target = current_node();
HTMLParser::AdjustedInsertionLocation adjusted_insertion_location;
// 2. Determine the adjusted insertion location using the first matching steps from the following list:
// `-> If foster parenting is enabled and target is a table, tbody, tfoot, thead, or tr element
if (m_foster_parenting && target.local_name().is_one_of(HTML::TagNames::table, HTML::TagNames::tbody, HTML::TagNames::tfoot, HTML::TagNames::thead, HTML::TagNames::tr)) {
// 1. Let last template be the last template element in the stack of open elements, if any.
auto last_template = m_stack_of_open_elements.last_element_with_tag_name(HTML::TagNames::template_);
// 2. Let last table be the last table element in the stack of open elements, if any.
auto last_table = m_stack_of_open_elements.last_element_with_tag_name(HTML::TagNames::table);
// 3. If there is a last template and either there is no last table,
// or there is one, but last template is lower (more recently added) than last table in the stack of open elements,
if (last_template.element && (!last_table.element || last_template.index > last_table.index)) {
// This returns the template content, so no need to check the parent is a template.
// then: let adjusted insertion location be inside last template's template contents, after its last child (if any), and abort these steps.
// NOTE: This returns the template content, so no need to check the parent is a template.
return { verify_cast<HTMLTemplateElement>(last_template.element)->content(), nullptr };
}
// 4. If there is no last table, then let adjusted insertion location be inside the first element in the stack of open elements (the html element),
// after its last child (if any), and abort these steps. (fragment case)
if (!last_table.element) {
VERIFY(m_parsing_fragment);
// Guaranteed not to be a template element (it will be the html element),
// so no need to check the parent is a template.
return { m_stack_of_open_elements.elements().first(), nullptr };
}
if (last_table.element->parent_node())
// 5. If last table has a parent node, then let adjusted insertion location be inside last table's parent node, immediately before last table, and abort these steps.
if (last_table.element->parent_node()) {
adjusted_insertion_location = { last_table.element->parent_node(), last_table.element };
else
adjusted_insertion_location = { m_stack_of_open_elements.element_before(*last_table.element), nullptr };
} else {
// 6. Let previous element be the element immediately above last table in the stack of open elements.
auto previous_element = m_stack_of_open_elements.element_before(*last_table.element);
// 7. Let adjusted insertion location be inside previous element, after its last child (if any).
adjusted_insertion_location = { previous_element, nullptr };
}
} else {
// `-> Otherwise
// Let adjusted insertion location be inside target, after its last child (if any).
adjusted_insertion_location = { target, nullptr };
}