ladybird/Userland/Libraries/LibWeb/CSS/MediaList.cpp

/*
 * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
 * Copyright (c) 2022-2023, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/MediaListPrototype.h>
#include <LibWeb/CSS/MediaList.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/WebIDL/ExceptionOr.h>

namespace Web::CSS {

JS_DEFINE_ALLOCATOR(MediaList);

JS::NonnullGCPtr<MediaList> MediaList::create(JS::Realm& realm, Vector<NonnullRefPtr<MediaQuery>>&& media)
{
    return realm.heap().allocate<MediaList>(realm, realm, move(media));
}

MediaList::MediaList(JS::Realm& realm, Vector<NonnullRefPtr<MediaQuery>>&& media)
    : Bindings::PlatformObject(realm)
    , m_media(move(media))
{
    m_legacy_platform_object_flags = LegacyPlatformObjectFlags { .supports_indexed_properties = true };
}

void MediaList::initialize(JS::Realm& realm)
{
    Base::initialize(realm);
    set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaListPrototype>(realm, "MediaList"_fly_string));
}

// https://www.w3.org/TR/cssom-1/#dom-medialist-mediatext
String MediaList::media_text() const
{
    return serialize_a_media_query_list(m_media);
}

// https://www.w3.org/TR/cssom-1/#dom-medialist-mediatext
void MediaList::set_media_text(StringView text)
{
    m_media.clear();
    if (text.is_empty())
        return;
    m_media = parse_media_query_list(Parser::ParsingContext { realm() }, text);
}

bool MediaList::is_supported_property_index(u32 index) const
{
    return index < length();
}

// https://www.w3.org/TR/cssom-1/#dom-medialist-item
Optional<String> MediaList::item(u32 index) const
{
    if (!is_supported_property_index(index))
        return {};

    return m_media[index]->to_string();
}

// https://www.w3.org/TR/cssom-1/#dom-medialist-appendmedium
void MediaList::append_medium(StringView medium)
{
    // 1. Let m be the result of parsing the given value.
    auto m = parse_media_query(Parser::ParsingContext { realm() }, medium);

    // 2. If m is null, then return.
    if (!m)
        return;

    // 3. If comparing m with any of the media queries in the collection of media queries returns true, then return.
    auto serialized = m->to_string();
    for (auto& existing_medium : m_media) {
        if (existing_medium->to_string() == serialized)
            return;
    }

    // 4. Append m to the collection of media queries.
    m_media.append(m.release_nonnull());
}

// https://www.w3.org/TR/cssom-1/#dom-medialist-deletemedium
void MediaList::delete_medium(StringView medium)
{
    auto m = parse_media_query(Parser::ParsingContext { realm() }, medium);
    if (!m)
        return;
    m_media.remove_all_matching([&](auto& existing) -> bool {
        return m->to_string() == existing->to_string();
    });
    // FIXME: If nothing was removed, then throw a NotFoundError exception.
}

bool MediaList::evaluate(HTML::Window const& window)
{
    for (auto& media : m_media)
        media->evaluate(window);

    return matches();
}

bool MediaList::matches() const
{
    if (m_media.is_empty()) {
        return true;
    }

    for (auto& media : m_media) {
        if (media->matches())
            return true;
    }
    return false;
}

WebIDL::ExceptionOr<JS::Value> MediaList::item_value(size_t index) const
{
    if (index >= m_media.size())
        return JS::js_undefined();
    return JS::PrimitiveString::create(vm(), m_media[index]->to_string());
}

}