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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/DOM/Element.h>
#include <LibWeb/HTML/Parser/HTMLParser.h>
#include <LibWeb/HTML/Parser/StackOfOpenElements.h>
namespace Web::HTML {
static Vector<FlyString> s_base_list { "applet", "caption", "html", "table", "td", "th", "marquee", "object", "template" };
StackOfOpenElements::~StackOfOpenElements() = default;
bool StackOfOpenElements::has_in_scope_impl(FlyString const& tag_name, Vector<FlyString> const& list) const
{
for (ssize_t i = m_elements.size() - 1; i >= 0; --i) {
auto& node = m_elements.at(i);
if (node.local_name() == tag_name)
return true;
if (list.contains_slow(node.local_name()))
return false;
}
VERIFY_NOT_REACHED();
}
bool StackOfOpenElements::has_in_scope(FlyString const& tag_name) const
{
return has_in_scope_impl(tag_name, s_base_list);
}
bool StackOfOpenElements::has_in_scope_impl(const DOM::Element& target_node, Vector<FlyString> const& 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.local_name()))
return false;
}
VERIFY_NOT_REACHED();
}
bool StackOfOpenElements::has_in_scope(const DOM::Element& target_node) const
{
return has_in_scope_impl(target_node, s_base_list);
}
bool StackOfOpenElements::has_in_button_scope(FlyString const& tag_name) const
{
auto list = s_base_list;
list.append("button");
return has_in_scope_impl(tag_name, list);
}
bool StackOfOpenElements::has_in_table_scope(FlyString const& tag_name) const
{
return has_in_scope_impl(tag_name, { "html", "table", "template" });
}
bool StackOfOpenElements::has_in_list_item_scope(FlyString const& tag_name) const
{
auto list = s_base_list;
list.append("ol");
list.append("ul");
return has_in_scope_impl(tag_name, list);
}
// https://html.spec.whatwg.org/multipage/parsing.html#has-an-element-in-select-scope
// The stack of open elements is said to have a particular element in select scope
// when it has that element in the specific scope consisting of all element types except the following:
// - optgroup in the HTML namespace
// - option in the HTML namespace
// NOTE: In this case it's "all element types _except_"
bool StackOfOpenElements::has_in_select_scope(FlyString const& tag_name) const
{
// https://html.spec.whatwg.org/multipage/parsing.html#has-an-element-in-the-specific-scope
for (ssize_t i = m_elements.size() - 1; i >= 0; --i) {
// 1. Initialize node to be the current node (the bottommost node of the stack).
auto& node = m_elements.at(i);
// 2. If node is the target node, terminate in a match state.
if (node.local_name() == tag_name)
return true;
// 3. Otherwise, if node is one of the element types in list, terminate in a failure state.
// NOTE: Here "list" refers to all elements except option and optgroup
if (node.local_name() != HTML::TagNames::option && node.local_name() != HTML::TagNames::optgroup)
return false;
// 4. Otherwise, set node to the previous entry in the stack of open elements and return to step 2.
}
// [4.] (This will never fail, since the loop will always terminate in the previous step if the top of the stack
// — an html element — is reached.)
VERIFY_NOT_REACHED();
}
bool StackOfOpenElements::contains(const DOM::Element& element) const
{
for (auto& element_on_stack : m_elements) {
if (&element == &element_on_stack)
return true;
}
return false;
}
bool StackOfOpenElements::contains(FlyString const& tag_name) const
{
for (auto& element_on_stack : m_elements) {
if (element_on_stack.local_name() == tag_name)
return true;
}
return false;
}
void StackOfOpenElements::pop_until_an_element_with_tag_name_has_been_popped(FlyString const& tag_name)
{
while (m_elements.last().local_name() != tag_name)
(void)pop();
(void)pop();
}
DOM::Element* StackOfOpenElements::topmost_special_node_below(const DOM::Element& formatting_element)
{
DOM::Element* found_element = nullptr;
for (ssize_t i = m_elements.size() - 1; i >= 0; --i) {
auto& element = m_elements[i];
if (&element == &formatting_element)
break;
if (HTMLParser::is_special_tag(element.local_name(), element.namespace_()))
found_element = &element;
}
return found_element;
}
StackOfOpenElements::LastElementResult StackOfOpenElements::last_element_with_tag_name(FlyString const& tag_name)
{
for (ssize_t i = m_elements.size() - 1; i >= 0; --i) {
auto& element = m_elements[i];
if (element.local_name() == tag_name)
return { &element, i };
}
return { nullptr, -1 };
}
DOM::Element* StackOfOpenElements::element_immediately_above(DOM::Element const& target)
{
bool found_target = false;
for (ssize_t i = m_elements.size() - 1; i >= 0; --i) {
auto& element = m_elements[i];
if (&element == &target) {
found_target = true;
} else if (found_target)
return &element;
}
return nullptr;
}
void StackOfOpenElements::remove(const DOM::Element& element)
{
m_elements.remove_first_matching([&element](DOM::Element const& other) {
return &other == &element;
});
}
void StackOfOpenElements::replace(const DOM::Element& to_remove, NonnullRefPtr<DOM::Element> to_add)
{
for (size_t i = 0; i < m_elements.size(); i++) {
if (&m_elements[i] == &to_remove) {
m_elements.remove(i);
m_elements.insert(i, move(to_add));
break;
}
}
}
void StackOfOpenElements::insert_immediately_below(NonnullRefPtr<DOM::Element> element_to_add, DOM::Element const& target)
{
for (size_t i = 0; i < m_elements.size(); i++) {
if (&m_elements[i] == &target) {
m_elements.insert(i + 1, move(element_to_add));
break;
}
}
}
}
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