mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-10-30 21:01:00 +00:00
103 lines
4 KiB
C++
103 lines
4 KiB
C++
/*
|
||
* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
|
||
*
|
||
* SPDX-License-Identifier: BSD-2-Clause
|
||
*/
|
||
|
||
#include "CountersSet.h"
|
||
#include <LibWeb/DOM/Element.h>
|
||
#include <LibWeb/DOM/Node.h>
|
||
|
||
namespace Web::CSS {
|
||
|
||
// https://drafts.csswg.org/css-lists-3/#instantiate-counter
|
||
Counter& CountersSet::instantiate_a_counter(FlyString name, UniqueNodeID originating_element_id, bool reversed, Optional<CounterValue> value)
|
||
{
|
||
// 1. Let counters be element’s CSS counters set.
|
||
auto* element = DOM::Node::from_unique_id(originating_element_id);
|
||
|
||
// 2. Let innermost counter be the last counter in counters with the name name.
|
||
// If innermost counter’s originating element is element or a previous sibling of element,
|
||
// remove innermost counter from counters.
|
||
auto innermost_counter = last_counter_with_name(name);
|
||
if (innermost_counter.has_value()) {
|
||
auto* originating_node = DOM::Node::from_unique_id(innermost_counter->originating_element_id);
|
||
VERIFY(originating_node);
|
||
auto& innermost_element = verify_cast<DOM::Element>(*originating_node);
|
||
|
||
if (&innermost_element == element
|
||
|| (innermost_element.parent() == element->parent() && innermost_element.is_before(*element))) {
|
||
|
||
m_counters.remove_first_matching([&innermost_counter](auto& it) {
|
||
return it.name == innermost_counter->name
|
||
&& it.originating_element_id == innermost_counter->originating_element_id;
|
||
});
|
||
}
|
||
}
|
||
|
||
// 3. Append a new counter to counters with name name, originating element element,
|
||
// reversed being reversed, and initial value value (if given)
|
||
m_counters.append({
|
||
.name = move(name),
|
||
.originating_element_id = originating_element_id,
|
||
.reversed = reversed,
|
||
.value = value,
|
||
});
|
||
|
||
return m_counters.last();
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-lists-3/#propdef-counter-set
|
||
void CountersSet::set_a_counter(FlyString name, UniqueNodeID originating_element_id, CounterValue value)
|
||
{
|
||
if (auto existing_counter = last_counter_with_name(name); existing_counter.has_value()) {
|
||
existing_counter->value = value;
|
||
return;
|
||
}
|
||
|
||
// If there is not currently a counter of the given name on the element, the element instantiates
|
||
// a new counter of the given name with a starting value of 0 before setting or incrementing its value.
|
||
// https://drafts.csswg.org/css-lists-3/#valdef-counter-set-counter-name-integer
|
||
auto& counter = instantiate_a_counter(name, originating_element_id, false, 0);
|
||
counter.value = value;
|
||
}
|
||
|
||
// https://drafts.csswg.org/css-lists-3/#propdef-counter-increment
|
||
void CountersSet::increment_a_counter(FlyString name, UniqueNodeID originating_element_id, CounterValue amount)
|
||
{
|
||
if (auto existing_counter = last_counter_with_name(name); existing_counter.has_value()) {
|
||
// FIXME: How should we handle existing counters with no value? Can that happen?
|
||
VERIFY(existing_counter->value.has_value());
|
||
existing_counter->value->saturating_add(amount.value());
|
||
return;
|
||
}
|
||
|
||
// If there is not currently a counter of the given name on the element, the element instantiates
|
||
// a new counter of the given name with a starting value of 0 before setting or incrementing its value.
|
||
// https://drafts.csswg.org/css-lists-3/#valdef-counter-set-counter-name-integer
|
||
auto& counter = instantiate_a_counter(name, originating_element_id, false, 0);
|
||
counter.value->saturating_add(amount.value());
|
||
}
|
||
|
||
Optional<Counter&> CountersSet::last_counter_with_name(FlyString const& name)
|
||
{
|
||
for (auto& counter : m_counters.in_reverse()) {
|
||
if (counter.name == name)
|
||
return counter;
|
||
}
|
||
return {};
|
||
}
|
||
|
||
Optional<Counter&> CountersSet::counter_with_same_name_and_creator(FlyString const& name, UniqueNodeID originating_element_id)
|
||
{
|
||
return m_counters.first_matching([&](auto& it) {
|
||
return it.name == name && it.originating_element_id == originating_element_id;
|
||
});
|
||
}
|
||
|
||
void CountersSet::append_copy(Counter const& counter)
|
||
{
|
||
m_counters.append(counter);
|
||
}
|
||
|
||
}
|