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c1d4323cf7
There are multiple things happening here which are interconnected: - We now use AbstractElement to refer to the source of a counter, which means we also need to pass that around to compute `content`. - Give AbstractElement new helper methods that are needed by CountersSet, so it doesn't have to care whether it's dealing with a true Element or PseudoElement. - The CountersSet algorithms now walk the layout tree instead of DOM tree, so TreeBuilder needs to wait until the layout node exists before it resolves counters for it. - Resolve counters when creating a pseudo-element's layout node. We awkwardly compute the `content` value up to twice: Once to figure out what kind of node we need to make, and then if it's a string, we do so again after counters are resolved so we can get the true value of any `counter()` functions. This will need adjusting in the future but it works for now.
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*
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* Copyright (c) 2024-2025, 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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#pragma once
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#include <AK/Checked.h>
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#include <AK/FlyString.h>
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#include <AK/Optional.h>
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#include <LibWeb/DOM/AbstractElement.h>
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#include <LibWeb/Forward.h>
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namespace Web::CSS {
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// "UAs may have implementation-specific limits on the maximum or minimum value of a counter.
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// If a counter reset, set, or increment would push the value outside of that range, the value
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// must be clamped to that range." - https://drafts.csswg.org/css-lists-3/#auto-numbering
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// So, we use a Checked<i32> and saturating addition/subtraction.
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using CounterValue = Checked<i32>;
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// https://drafts.csswg.org/css-lists-3/#counter
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struct Counter {
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FlyString name;
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DOM::AbstractElement originating_element; // "creator"
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bool reversed { false };
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Optional<CounterValue> value;
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};
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// https://drafts.csswg.org/css-lists-3/#css-counters-set
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class CountersSet {
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public:
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CountersSet() = default;
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~CountersSet() = default;
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Counter& instantiate_a_counter(FlyString name, DOM::AbstractElement const&, bool reversed, Optional<CounterValue>);
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void set_a_counter(FlyString name, DOM::AbstractElement const&, CounterValue value);
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void increment_a_counter(FlyString name, DOM::AbstractElement const&, CounterValue amount);
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void append_copy(Counter const&);
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Optional<Counter&> last_counter_with_name(FlyString const& name);
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Optional<Counter&> counter_with_same_name_and_creator(FlyString const& name, DOM::AbstractElement const&);
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Vector<Counter> const& counters() const { return m_counters; }
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bool is_empty() const { return m_counters.is_empty(); }
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void visit_edges(GC::Cell::Visitor&);
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String dump() const;
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private:
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Vector<Counter> m_counters;
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};
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void resolve_counters(DOM::AbstractElement&);
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void inherit_counters(DOM::AbstractElement&);
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}
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