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LibWeb: Implement @supports rule :^)

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The main thing missing is that we don't serialize the supports clause,
but for actually using a `@supports (something: cool) {}` rule in CSS,
it works!
This commit is contained in:
Sam Atkins 2021-10-08 17:48:14 +01:00 • committed by Andreas Kling
parent 439d978ea5
commit 57a25139a5
9 changed files with 129 additions and 0 deletions
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47
Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h Normal file
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/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullRefPtr.h>
#include <AK/NonnullRefPtrVector.h>
#include <LibWeb/CSS/CSSConditionRule.h>
#include <LibWeb/CSS/CSSRule.h>
#include <LibWeb/CSS/Supports.h>
#include <LibWeb/Forward.h>
namespace Web::CSS {
// https://www.w3.org/TR/css-conditional-3/#the-csssupportsrule-interface
class CSSSupportsRule final : public CSSConditionRule {
AK_MAKE_NONCOPYABLE(CSSSupportsRule);
AK_MAKE_NONMOVABLE(CSSSupportsRule);
public:
static NonnullRefPtr<CSSSupportsRule> create(NonnullRefPtr<Supports>&& supports, NonnullRefPtrVector<CSSRule>&& rules)
{
return adopt_ref(*new CSSSupportsRule(move(supports), move(rules)));
}
~CSSSupportsRule();
virtual StringView class_name() const override { return "CSSSupportsRule"; };
virtual Type type() const override { return Type::Supports; };
String condition_text() const override;
void set_condition_text(String) override;
virtual bool condition_matches() const override { return m_supports->matches(); }
private:
explicit CSSSupportsRule(NonnullRefPtr<Supports>&&, NonnullRefPtrVector<CSSRule>&&);
NonnullRefPtr<Supports> m_supports;
};
template<>
inline bool CSSRule::fast_is<CSSSupportsRule>() const { return type() == CSSRule::Type::Supports; }
}