ladybird/Libraries/LibWeb/CSS/Supports.h
Sam Atkins b6fb4baeb7 LibWeb/CSS: Implement @supports font-format() and font-tech()
These let authors query whether we support font formats and features.
2025-03-17 10:00:19 +00:00

125 lines
3.6 KiB
C++

/*
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/FlyString.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/String.h>
#include <LibWeb/CSS/BooleanExpression.h>
namespace Web::CSS {
// https://www.w3.org/TR/css-conditional-3/#at-supports
class Supports final : public RefCounted<Supports> {
public:
class Declaration final : public BooleanExpression {
public:
static NonnullOwnPtr<Declaration> create(String declaration, bool matches)
{
return adopt_own(*new Declaration(move(declaration), matches));
}
virtual ~Declaration() override = default;
virtual MatchResult evaluate(HTML::Window const*) const override;
virtual String to_string() const override;
virtual void dump(StringBuilder&, int indent_levels = 0) const override;
private:
Declaration(String declaration, bool matches)
: m_declaration(move(declaration))
, m_matches(matches)
{
}
String m_declaration;
bool m_matches;
};
class Selector final : public BooleanExpression {
public:
static NonnullOwnPtr<Selector> create(String selector, bool matches)
{
return adopt_own(*new Selector(move(selector), matches));
}
virtual ~Selector() override = default;
virtual MatchResult evaluate(HTML::Window const*) const override;
virtual String to_string() const override;
virtual void dump(StringBuilder&, int indent_levels = 0) const override;
private:
Selector(String selector, bool matches)
: m_selector(move(selector))
, m_matches(matches)
{
}
String m_selector;
bool m_matches;
};
class FontTech final : public BooleanExpression {
public:
static NonnullOwnPtr<FontTech> create(FlyString tech, bool matches)
{
return adopt_own(*new FontTech(move(tech), matches));
}
virtual ~FontTech() override = default;
virtual MatchResult evaluate(HTML::Window const*) const override;
virtual String to_string() const override;
virtual void dump(StringBuilder&, int indent_levels = 0) const override;
private:
FontTech(FlyString tech, bool matches)
: m_tech(move(tech))
, m_matches(matches)
{
}
FlyString m_tech;
bool m_matches;
};
class FontFormat final : public BooleanExpression {
public:
static NonnullOwnPtr<FontFormat> create(FlyString format, bool matches)
{
return adopt_own(*new FontFormat(move(format), matches));
}
virtual ~FontFormat() override = default;
virtual MatchResult evaluate(HTML::Window const*) const override;
virtual String to_string() const override;
virtual void dump(StringBuilder&, int indent_levels = 0) const override;
private:
FontFormat(FlyString format, bool matches)
: m_format(move(format))
, m_matches(matches)
{
}
FlyString m_format;
bool m_matches;
};
static NonnullRefPtr<Supports> create(NonnullOwnPtr<BooleanExpression>&& condition)
{
return adopt_ref(*new Supports(move(condition)));
}
bool matches() const { return m_matches; }
String to_string() const;
void dump(StringBuilder&, int indent_levels = 0) const;
private:
Supports(NonnullOwnPtr<BooleanExpression>&&);
NonnullOwnPtr<BooleanExpression> m_condition;
bool m_matches { false };
};
}