46bba44f8b
It's not a complicated algorithm, but having it in one place instead of 2, and with spec comments, is nice. :^)
126 lines
3 KiB
C++
126 lines
3 KiB
C++
/*
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* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.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/FlyString.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Optional.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <LibWeb/CSS/StyleValue.h>
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namespace Web::CSS {
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class MediaQuery : public RefCounted<MediaQuery> {
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friend class Parser;
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public:
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~MediaQuery() = default;
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// https://www.w3.org/TR/mediaqueries-4/#media-types
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enum class MediaType {
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All,
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Print,
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Screen,
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// Deprecated, must never match:
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TTY,
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TV,
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Projection,
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Handheld,
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Braille,
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Embossed,
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Aural,
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Speech,
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};
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// https://www.w3.org/TR/mediaqueries-4/#mq-features
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struct MediaFeature {
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// FIXME: Implement range syntax: https://www.w3.org/TR/mediaqueries-4/#mq-ranges
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enum class Type {
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IsTrue,
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ExactValue,
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MinValue,
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MaxValue,
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};
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Type type;
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FlyString name;
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RefPtr<StyleValue> value { nullptr };
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bool evaluate(DOM::Window const&) const;
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String to_string() const;
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};
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// https://www.w3.org/TR/mediaqueries-4/#media-conditions
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struct MediaCondition {
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enum class Type {
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Single,
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And,
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Or,
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Not,
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};
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Type type;
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MediaFeature feature;
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NonnullOwnPtrVector<MediaCondition> conditions;
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bool evaluate(DOM::Window const&) const;
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String to_string() const;
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};
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static NonnullRefPtr<MediaQuery> create_not_all();
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static NonnullRefPtr<MediaQuery> create() { return adopt_ref(*new MediaQuery); }
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bool matches() const { return m_matches; }
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bool evaluate(DOM::Window const&);
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String to_string() const;
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private:
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MediaQuery() = default;
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// https://www.w3.org/TR/mediaqueries-4/#mq-not
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bool m_negated { false };
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MediaType m_media_type { MediaType::All };
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OwnPtr<MediaCondition> m_media_condition { nullptr };
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// Cached value, updated by evaluate()
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bool m_matches { false };
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};
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String serialize_a_media_query_list(NonnullRefPtrVector<MediaQuery> const&);
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}
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namespace AK {
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template<>
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struct Formatter<Web::CSS::MediaQuery::MediaFeature> : Formatter<StringView> {
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void format(FormatBuilder& builder, Web::CSS::MediaQuery::MediaFeature const& media_feature)
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{
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Formatter<StringView>::format(builder, media_feature.to_string());
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}
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};
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template<>
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struct Formatter<Web::CSS::MediaQuery::MediaCondition> : Formatter<StringView> {
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void format(FormatBuilder& builder, Web::CSS::MediaQuery::MediaCondition const& media_condition)
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{
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Formatter<StringView>::format(builder, media_condition.to_string());
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}
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};
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template<>
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struct Formatter<Web::CSS::MediaQuery> : Formatter<StringView> {
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void format(FormatBuilder& builder, Web::CSS::MediaQuery const& media_query)
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{
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Formatter<StringView>::format(builder, media_query.to_string());
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}
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};
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}
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