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LibWeb: Implement the first half of the Adoption Agency Algorithm

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The AAA is a somewhat daunting algorithm you have to run for certain
tag when inserted inside the <body> element. The purpose of it is to
resolve issues with mismatched tags.

This patch implements the first half of the AAA. We also move the
"list of active formatting elements" to its own class, since it kept
accumulating little behaviors. "Marker" entries are now signified by
null Element pointers in the list.
This commit is contained in:
Andreas Kling 2020-05-27 23:22:42 +02:00
parent 4c9c6b3a7b
commit db6cf9b37d
7 changed files with 248 additions and 16 deletions
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17
Libraries/LibWeb/Parser/StackOfOpenElements.cpp
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@ -52,6 +52,23 @@ bool StackOfOpenElements::has_in_scope(const FlyString& tag_name) const
return has_in_scope_impl(tag_name, s_base_list);
}
bool StackOfOpenElements::has_in_scope_impl(const Element& target_node, const Vector<FlyString>& list) const
{
for (ssize_t i = m_elements.size() - 1; i >= 0; --i) {
auto& node = m_elements.at(i);
if (&node == &target_node)
return true;
if (list.contains_slow(node.tag_name()))
return false;
}
ASSERT_NOT_REACHED();
}
bool StackOfOpenElements::has_in_scope(const Element& target_node) const
{
return has_in_scope_impl(target_node, s_base_list);
}
bool StackOfOpenElements::has_in_button_scope(const FlyString& tag_name) const
{
auto list = s_base_list;