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LibWeb/CSS: Add tokenize() method to style values, to get a list of CVs

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A couple of arbitrary substitution functions require us to get or
produce some style value, and then substitute its ComponentValues into
the original ComponentValue list. So this commit gives CSSStyleValue a
tokenize() method that does so.

Apart from a couple of unusual cases like the guaranteed-invalid value,
style values can all be converted into ComponentValues by serializing
them as a string, and then parsing that as a list of component values.
That feels unnecessarily inefficient in most cases though, so I've
implemented faster overrides for a lot of the basic style value
classes, but left that serialize-and-reparse method as the fallback.
This commit is contained in:
Sam Atkins 2025-07-10 12:17:27 +01:00 • committed by Tim Ledbetter
commit 5aba457009
Notes: github-actions[bot] 2025-07-16 13:50:05 +00:00
17 changed files with 90 additions and 8 deletions
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3
Libraries/LibWeb/CSS/StyleValues/NumberStyleValue.h
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@ -1,7 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2024, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -25,6 +25,7 @@ public:
virtual StringView unit() const override { return "number"sv; }
virtual String to_string(SerializationMode) const override;
virtual Vector<Parser::ComponentValue> tokenize() const override;
bool equals(CSSStyleValue const& other) const override
{