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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
Notes: sideshowbarker 2024-07-19 06:03:46 +09:00
7 changed files with 248 additions and 16 deletions
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74
Libraries/LibWeb/Parser/ListOfActiveFormattingElements.cpp Normal file
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibWeb/DOM/Element.h>
#include <LibWeb/Parser/ListOfActiveFormattingElements.h>
namespace Web {
ListOfActiveFormattingElements::~ListOfActiveFormattingElements()
{
}
void ListOfActiveFormattingElements::add(Element& element)
{
m_entries.append({ element });
}
void ListOfActiveFormattingElements::add_marker()
{
m_entries.append({ nullptr });
}
bool ListOfActiveFormattingElements::contains(const Element& element) const
{
for (auto& entry : m_entries) {
if (entry.element == &element)
return true;
}
return false;
}
Element* ListOfActiveFormattingElements::last_element_with_tag_name_before_marker(const FlyString& tag_name)
{
for (ssize_t i = m_entries.size() - 1; i >= 0; --i) {
auto& entry = m_entries[i];
if (entry.is_marker())
return nullptr;
if (entry.element->tag_name() == tag_name)
return entry.element;
}
return nullptr;
}
void ListOfActiveFormattingElements::remove(Element& element)
{
m_entries.remove_first_matching([&](auto& entry) {
return entry.element == &element;
});
}
}