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4fdb266077
This is strictly nicer than passing them around as i32 everywhere, and by switching to i64 as the underlying type, ID allocation becomes as simple as incrementing an integer.
103 lines
4 KiB
C++
103 lines
4 KiB
C++
/*
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* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "CountersSet.h"
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/DOM/Node.h>
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namespace Web::CSS {
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// https://drafts.csswg.org/css-lists-3/#instantiate-counter
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Counter& CountersSet::instantiate_a_counter(FlyString name, UniqueNodeID originating_element_id, bool reversed, Optional<CounterValue> value)
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{
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// 1. Let counters be element’s CSS counters set.
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auto* element = DOM::Node::from_unique_id(originating_element_id);
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// 2. Let innermost counter be the last counter in counters with the name name.
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// If innermost counter’s originating element is element or a previous sibling of element,
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// remove innermost counter from counters.
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auto innermost_counter = last_counter_with_name(name);
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if (innermost_counter.has_value()) {
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auto* originating_node = DOM::Node::from_unique_id(innermost_counter->originating_element_id);
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VERIFY(originating_node);
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auto& innermost_element = verify_cast<DOM::Element>(*originating_node);
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if (&innermost_element == element
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|| (innermost_element.parent() == element->parent() && innermost_element.is_before(*element))) {
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m_counters.remove_first_matching([&innermost_counter](auto& it) {
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return it.name == innermost_counter->name
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&& it.originating_element_id == innermost_counter->originating_element_id;
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});
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}
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}
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// 3. Append a new counter to counters with name name, originating element element,
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// reversed being reversed, and initial value value (if given)
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m_counters.append({
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.name = move(name),
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.originating_element_id = originating_element_id,
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.reversed = reversed,
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.value = value,
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});
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return m_counters.last();
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}
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// https://drafts.csswg.org/css-lists-3/#propdef-counter-set
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void CountersSet::set_a_counter(FlyString name, UniqueNodeID originating_element_id, CounterValue value)
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{
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if (auto existing_counter = last_counter_with_name(name); existing_counter.has_value()) {
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existing_counter->value = value;
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return;
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}
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// If there is not currently a counter of the given name on the element, the element instantiates
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// a new counter of the given name with a starting value of 0 before setting or incrementing its value.
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// https://drafts.csswg.org/css-lists-3/#valdef-counter-set-counter-name-integer
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auto& counter = instantiate_a_counter(name, originating_element_id, false, 0);
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counter.value = value;
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}
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// https://drafts.csswg.org/css-lists-3/#propdef-counter-increment
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void CountersSet::increment_a_counter(FlyString name, UniqueNodeID originating_element_id, CounterValue amount)
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{
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if (auto existing_counter = last_counter_with_name(name); existing_counter.has_value()) {
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// FIXME: How should we handle existing counters with no value? Can that happen?
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VERIFY(existing_counter->value.has_value());
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existing_counter->value->saturating_add(amount.value());
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return;
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}
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// If there is not currently a counter of the given name on the element, the element instantiates
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// a new counter of the given name with a starting value of 0 before setting or incrementing its value.
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// https://drafts.csswg.org/css-lists-3/#valdef-counter-set-counter-name-integer
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auto& counter = instantiate_a_counter(name, originating_element_id, false, 0);
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counter.value->saturating_add(amount.value());
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}
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Optional<Counter&> CountersSet::last_counter_with_name(FlyString const& name)
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{
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for (auto& counter : m_counters.in_reverse()) {
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if (counter.name == name)
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return counter;
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}
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return {};
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}
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Optional<Counter&> CountersSet::counter_with_same_name_and_creator(FlyString const& name, UniqueNodeID originating_element_id)
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{
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return m_counters.first_matching([&](auto& it) {
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return it.name == name && it.originating_element_id == originating_element_id;
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});
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}
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void CountersSet::append_copy(Counter const& counter)
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{
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m_counters.append(counter);
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}
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}
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