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ladybird/Userland/Libraries/LibWeb/CSS/Parser/MediaParsing.cpp
Sam Atkins b645e26e9b LibWeb/CSS: Bring TokenStream in line with spec 
When the TokenStream code was originally written, there was no such
concept in the CSS Syntax spec. But since then, it's been officially
added, (https://drafts.csswg.org/css-syntax/#css-token-stream) and the
parsing algorithms are described in terms of it. This patch brings our
implementation in line with the spec. A few deprecated TokenStream
methods are left around until their users are also updated to match the
newer spec.

There are a few differences:

- They name things differently. The main confusing one is we had
  `next_token()` which consumed a token and returned it, but the spec
  has a `next_token()` which peeks the next token. The spec names are
  honestly better than what I'd come up with. (`discard_a_token()` is a
  nice addition too!)

- We used to store the index of the token that was just consumed, and
  they instead store the index of the token that will be consumed next.
  This is a perfect breeding ground for off-by-one errors, so I've
  finally added a test suite for TokenStream itself.

- We use a transaction system for rewinding, and the spec uses a stack
  of "marks", which can be manually rewound to. These should be able to
  coexist as long as we stick with marks in the parser spec algorithms,
  and stick with transactions elsewhere.
2024-10-09 17:29:29 +01:00

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/*
* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2020-2021, the SerenityOS developers.
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <LibWeb/CSS/CSSMediaRule.h>
#include <LibWeb/CSS/CalculatedOr.h>
#include <LibWeb/CSS/MediaList.h>
#include <LibWeb/CSS/MediaQuery.h>
#include <LibWeb/CSS/Parser/Parser.h>
namespace Web::CSS::Parser {
Vector<NonnullRefPtr<MediaQuery>> Parser::parse_as_media_query_list()
{
return parse_a_media_query_list(m_token_stream);
}
template<typename T>
Vector<NonnullRefPtr<MediaQuery>> Parser::parse_a_media_query_list(TokenStream<T>& tokens)
{
// https://www.w3.org/TR/mediaqueries-4/#mq-list
// AD-HOC: Ignore whitespace-only queries
// to make `@media {..}` equivalent to `@media all {..}`
tokens.discard_whitespace();
if (!tokens.has_next_token())
return {};
auto comma_separated_lists = parse_a_comma_separated_list_of_component_values(tokens);
AK::Vector<NonnullRefPtr<MediaQuery>> media_queries;
for (auto& media_query_parts : comma_separated_lists) {
auto stream = TokenStream(media_query_parts);
media_queries.append(parse_media_query(stream));
}
return media_queries;
}
RefPtr<MediaQuery> Parser::parse_as_media_query()
{
// https://www.w3.org/TR/cssom-1/#parse-a-media-query
auto media_query_list = parse_as_media_query_list();
if (media_query_list.is_empty())
return MediaQuery::create_not_all();
if (media_query_list.size() == 1)
return media_query_list.first();
return nullptr;
}
// `<media-query>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-query
NonnullRefPtr<MediaQuery> Parser::parse_media_query(TokenStream<ComponentValue>& tokens)
{
// `<media-query> = <media-condition>
// | [ not | only ]? <media-type> [ and <media-condition-without-or> ]?`
// `[ not | only ]?`, Returns whether to negate the query
auto parse_initial_modifier = [](auto& tokens) -> Optional<bool> {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
auto& token = tokens.consume_a_token();
if (!token.is(Token::Type::Ident))
return {};
auto ident = token.token().ident();
if (ident.equals_ignoring_ascii_case("not"sv)) {
transaction.commit();
return true;
}
if (ident.equals_ignoring_ascii_case("only"sv)) {
transaction.commit();
return false;
}
return {};
};
auto invalid_media_query = [&]() {
// "A media query that does not match the grammar in the previous section must be replaced by `not all`
// during parsing." - https://www.w3.org/TR/mediaqueries-5/#error-handling
if constexpr (CSS_PARSER_DEBUG) {
dbgln("Invalid media query:");
tokens.dump_all_tokens();
}
return MediaQuery::create_not_all();
};
auto media_query = MediaQuery::create();
tokens.discard_whitespace();
// `<media-condition>`
if (auto media_condition = parse_media_condition(tokens, MediaCondition::AllowOr::Yes)) {
tokens.discard_whitespace();
if (tokens.has_next_token())
return invalid_media_query();
media_query->m_media_condition = move(media_condition);
return media_query;
}
// `[ not | only ]?`
if (auto modifier = parse_initial_modifier(tokens); modifier.has_value()) {
media_query->m_negated = modifier.value();
tokens.discard_whitespace();
}
// `<media-type>`
if (auto media_type = parse_media_type(tokens); media_type.has_value()) {
media_query->m_media_type = media_type.value();
tokens.discard_whitespace();
} else {
return invalid_media_query();
}
if (!tokens.has_next_token())
return media_query;
// `[ and <media-condition-without-or> ]?`
if (auto maybe_and = tokens.consume_a_token(); maybe_and.is_ident("and"sv)) {
if (auto media_condition = parse_media_condition(tokens, MediaCondition::AllowOr::No)) {
tokens.discard_whitespace();
if (tokens.has_next_token())
return invalid_media_query();
media_query->m_media_condition = move(media_condition);
return media_query;
}
return invalid_media_query();
}
return invalid_media_query();
}
// `<media-condition>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-condition
// `<media-condition-widthout-or>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-condition-without-or
// (We distinguish between these two with the `allow_or` parameter.)
OwnPtr<MediaCondition> Parser::parse_media_condition(TokenStream<ComponentValue>& tokens, MediaCondition::AllowOr allow_or)
{
// `<media-not> | <media-in-parens> [ <media-and>* | <media-or>* ]`
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
// `<media-not> = not <media-in-parens>`
auto parse_media_not = [&](auto& tokens) -> OwnPtr<MediaCondition> {
auto local_transaction = tokens.begin_transaction();
tokens.discard_whitespace();
auto& first_token = tokens.consume_a_token();
if (first_token.is_ident("not"sv)) {
if (auto child_condition = parse_media_condition(tokens, MediaCondition::AllowOr::Yes)) {
local_transaction.commit();
return MediaCondition::from_not(child_condition.release_nonnull());
}
}
return {};
};
auto parse_media_with_combinator = [&](auto& tokens, StringView combinator) -> OwnPtr<MediaCondition> {
auto local_transaction = tokens.begin_transaction();
tokens.discard_whitespace();
auto& first = tokens.consume_a_token();
if (first.is_ident(combinator)) {
tokens.discard_whitespace();
if (auto media_in_parens = parse_media_in_parens(tokens)) {
local_transaction.commit();
return media_in_parens;
}
}
return {};
};
// `<media-and> = and <media-in-parens>`
auto parse_media_and = [&](auto& tokens) { return parse_media_with_combinator(tokens, "and"sv); };
// `<media-or> = or <media-in-parens>`
auto parse_media_or = [&](auto& tokens) { return parse_media_with_combinator(tokens, "or"sv); };
// `<media-not>`
if (auto maybe_media_not = parse_media_not(tokens)) {
transaction.commit();
return maybe_media_not.release_nonnull();
}
// `<media-in-parens> [ <media-and>* | <media-or>* ]`
if (auto maybe_media_in_parens = parse_media_in_parens(tokens)) {
tokens.discard_whitespace();
// Only `<media-in-parens>`
if (!tokens.has_next_token()) {
transaction.commit();
return maybe_media_in_parens.release_nonnull();
}
Vector<NonnullOwnPtr<MediaCondition>> child_conditions;
child_conditions.append(maybe_media_in_parens.release_nonnull());
// `<media-and>*`
if (auto media_and = parse_media_and(tokens)) {
child_conditions.append(media_and.release_nonnull());
tokens.discard_whitespace();
while (tokens.has_next_token()) {
if (auto next_media_and = parse_media_and(tokens)) {
child_conditions.append(next_media_and.release_nonnull());
tokens.discard_whitespace();
continue;
}
// We failed - invalid syntax!
return {};
}
transaction.commit();
return MediaCondition::from_and_list(move(child_conditions));
}
// `<media-or>*`
if (allow_or == MediaCondition::AllowOr::Yes) {
if (auto media_or = parse_media_or(tokens)) {
child_conditions.append(media_or.release_nonnull());
tokens.discard_whitespace();
while (tokens.has_next_token()) {
if (auto next_media_or = parse_media_or(tokens)) {
child_conditions.append(next_media_or.release_nonnull());
tokens.discard_whitespace();
continue;
}
// We failed - invalid syntax!
return {};
}
transaction.commit();
return MediaCondition::from_or_list(move(child_conditions));
}
}
}
return {};
}
// `<media-feature>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-feature
Optional<MediaFeature> Parser::parse_media_feature(TokenStream<ComponentValue>& tokens)
{
// `[ <mf-plain> | <mf-boolean> | <mf-range> ]`
tokens.discard_whitespace();
// `<mf-name> = <ident>`
struct MediaFeatureName {
enum Type {
Normal,
Min,
Max
} type;
MediaFeatureID id;
};
auto parse_mf_name = [](auto& tokens, bool allow_min_max_prefix) -> Optional<MediaFeatureName> {
auto transaction = tokens.begin_transaction();
auto& token = tokens.consume_a_token();
if (token.is(Token::Type::Ident)) {
auto name = token.token().ident();
if (auto id = media_feature_id_from_string(name); id.has_value()) {
transaction.commit();
return MediaFeatureName { MediaFeatureName::Type::Normal, id.value() };
}
if (allow_min_max_prefix && (name.starts_with_bytes("min-"sv, CaseSensitivity::CaseInsensitive) || name.starts_with_bytes("max-"sv, CaseSensitivity::CaseInsensitive))) {
auto adjusted_name = name.bytes_as_string_view().substring_view(4);
if (auto id = media_feature_id_from_string(adjusted_name); id.has_value() && media_feature_type_is_range(id.value())) {
transaction.commit();
return MediaFeatureName {
name.starts_with_bytes("min-"sv, CaseSensitivity::CaseInsensitive) ? MediaFeatureName::Type::Min : MediaFeatureName::Type::Max,
id.value()
};
}
}
}
return {};
};
// `<mf-boolean> = <mf-name>`
auto parse_mf_boolean = [&](auto& tokens) -> Optional<MediaFeature> {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto maybe_name = parse_mf_name(tokens, false); maybe_name.has_value()) {
tokens.discard_whitespace();
if (!tokens.has_next_token()) {
transaction.commit();
return MediaFeature::boolean(maybe_name->id);
}
}
return {};
};
// `<mf-plain> = <mf-name> : <mf-value>`
auto parse_mf_plain = [&](auto& tokens) -> Optional<MediaFeature> {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto maybe_name = parse_mf_name(tokens, true); maybe_name.has_value()) {
tokens.discard_whitespace();
if (tokens.consume_a_token().is(Token::Type::Colon)) {
tokens.discard_whitespace();
if (auto maybe_value = parse_media_feature_value(maybe_name->id, tokens); maybe_value.has_value()) {
tokens.discard_whitespace();
if (!tokens.has_next_token()) {
transaction.commit();
switch (maybe_name->type) {
case MediaFeatureName::Type::Normal:
return MediaFeature::plain(maybe_name->id, maybe_value.release_value());
case MediaFeatureName::Type::Min:
return MediaFeature::min(maybe_name->id, maybe_value.release_value());
case MediaFeatureName::Type::Max:
return MediaFeature::max(maybe_name->id, maybe_value.release_value());
}
VERIFY_NOT_REACHED();
}
}
}
}
return {};
};
// `<mf-lt> = '<' '='?
// <mf-gt> = '>' '='?
// <mf-eq> = '='
// <mf-comparison> = <mf-lt> | <mf-gt> | <mf-eq>`
auto parse_comparison = [](auto& tokens) -> Optional<MediaFeature::Comparison> {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
auto& first = tokens.consume_a_token();
if (first.is(Token::Type::Delim)) {
auto first_delim = first.token().delim();
if (first_delim == '=') {
transaction.commit();
return MediaFeature::Comparison::Equal;
}
if (first_delim == '<') {
auto& second = tokens.next_token();
if (second.is_delim('=')) {
tokens.discard_a_token();
transaction.commit();
return MediaFeature::Comparison::LessThanOrEqual;
}
transaction.commit();
return MediaFeature::Comparison::LessThan;
}
if (first_delim == '>') {
auto& second = tokens.next_token();
if (second.is_delim('=')) {
tokens.discard_a_token();
transaction.commit();
return MediaFeature::Comparison::GreaterThanOrEqual;
}
transaction.commit();
return MediaFeature::Comparison::GreaterThan;
}
}
return {};
};
auto flip = [](MediaFeature::Comparison comparison) {
switch (comparison) {
case MediaFeature::Comparison::Equal:
return MediaFeature::Comparison::Equal;
case MediaFeature::Comparison::LessThan:
return MediaFeature::Comparison::GreaterThan;
case MediaFeature::Comparison::LessThanOrEqual:
return MediaFeature::Comparison::GreaterThanOrEqual;
case MediaFeature::Comparison::GreaterThan:
return MediaFeature::Comparison::LessThan;
case MediaFeature::Comparison::GreaterThanOrEqual:
return MediaFeature::Comparison::LessThanOrEqual;
}
VERIFY_NOT_REACHED();
};
auto comparisons_match = [](MediaFeature::Comparison a, MediaFeature::Comparison b) -> bool {
switch (a) {
case MediaFeature::Comparison::Equal:
return b == MediaFeature::Comparison::Equal;
case MediaFeature::Comparison::LessThan:
case MediaFeature::Comparison::LessThanOrEqual:
return b == MediaFeature::Comparison::LessThan || b == MediaFeature::Comparison::LessThanOrEqual;
case MediaFeature::Comparison::GreaterThan:
case MediaFeature::Comparison::GreaterThanOrEqual:
return b == MediaFeature::Comparison::GreaterThan || b == MediaFeature::Comparison::GreaterThanOrEqual;
}
VERIFY_NOT_REACHED();
};
// `<mf-range> = <mf-name> <mf-comparison> <mf-value>
// | <mf-value> <mf-comparison> <mf-name>
// | <mf-value> <mf-lt> <mf-name> <mf-lt> <mf-value>
// | <mf-value> <mf-gt> <mf-name> <mf-gt> <mf-value>`
auto parse_mf_range = [&](auto& tokens) -> Optional<MediaFeature> {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
// `<mf-name> <mf-comparison> <mf-value>`
// NOTE: We have to check for <mf-name> first, since all <mf-name>s will also parse as <mf-value>.
if (auto maybe_name = parse_mf_name(tokens, false); maybe_name.has_value() && media_feature_type_is_range(maybe_name->id)) {
tokens.discard_whitespace();
if (auto maybe_comparison = parse_comparison(tokens); maybe_comparison.has_value()) {
tokens.discard_whitespace();
if (auto maybe_value = parse_media_feature_value(maybe_name->id, tokens); maybe_value.has_value()) {
tokens.discard_whitespace();
if (!tokens.has_next_token() && !maybe_value->is_ident()) {
transaction.commit();
return MediaFeature::half_range(maybe_value.release_value(), flip(maybe_comparison.release_value()), maybe_name->id);
}
}
}
}
// `<mf-value> <mf-comparison> <mf-name>
// | <mf-value> <mf-lt> <mf-name> <mf-lt> <mf-value>
// | <mf-value> <mf-gt> <mf-name> <mf-gt> <mf-value>`
// NOTE: To parse the first value, we need to first find and parse the <mf-name> so we know what value types to parse.
// To allow for <mf-value> to be any number of tokens long, we scan forward until we find a comparison, and then
// treat the next non-whitespace token as the <mf-name>, which should be correct as long as they don't add a value
// type that can include a comparison in it. :^)
Optional<MediaFeatureName> maybe_name;
{
// This transaction is never committed, we just use it to rewind automatically.
auto temp_transaction = tokens.begin_transaction();
while (tokens.has_next_token() && !maybe_name.has_value()) {
if (auto maybe_comparison = parse_comparison(tokens); maybe_comparison.has_value()) {
// We found a comparison, so the next non-whitespace token should be the <mf-name>
tokens.discard_whitespace();
maybe_name = parse_mf_name(tokens, false);
break;
}
tokens.discard_a_token();
tokens.discard_whitespace();
}
}
// Now, we can parse the range properly.
if (maybe_name.has_value() && media_feature_type_is_range(maybe_name->id)) {
if (auto maybe_left_value = parse_media_feature_value(maybe_name->id, tokens); maybe_left_value.has_value()) {
tokens.discard_whitespace();
if (auto maybe_left_comparison = parse_comparison(tokens); maybe_left_comparison.has_value()) {
tokens.discard_whitespace();
tokens.discard_a_token(); // The <mf-name> which we already parsed above.
tokens.discard_whitespace();
if (!tokens.has_next_token()) {
transaction.commit();
return MediaFeature::half_range(maybe_left_value.release_value(), maybe_left_comparison.release_value(), maybe_name->id);
}
if (auto maybe_right_comparison = parse_comparison(tokens); maybe_right_comparison.has_value()) {
tokens.discard_whitespace();
if (auto maybe_right_value = parse_media_feature_value(maybe_name->id, tokens); maybe_right_value.has_value()) {
tokens.discard_whitespace();
// For this to be valid, the following must be true:
// - Comparisons must either both be >/>= or both be </<=.
// - Neither comparison can be `=`.
// - Neither value can be an ident.
auto left_comparison = maybe_left_comparison.release_value();
auto right_comparison = maybe_right_comparison.release_value();
if (!tokens.has_next_token()
&& comparisons_match(left_comparison, right_comparison)
&& left_comparison != MediaFeature::Comparison::Equal
&& !maybe_left_value->is_ident() && !maybe_right_value->is_ident()) {
transaction.commit();
return MediaFeature::range(maybe_left_value.release_value(), left_comparison, maybe_name->id, right_comparison, maybe_right_value.release_value());
}
}
}
}
}
}
return {};
};
if (auto maybe_mf_boolean = parse_mf_boolean(tokens); maybe_mf_boolean.has_value())
return maybe_mf_boolean.release_value();
if (auto maybe_mf_plain = parse_mf_plain(tokens); maybe_mf_plain.has_value())
return maybe_mf_plain.release_value();
if (auto maybe_mf_range = parse_mf_range(tokens); maybe_mf_range.has_value())
return maybe_mf_range.release_value();
return {};
}
Optional<MediaQuery::MediaType> Parser::parse_media_type(TokenStream<ComponentValue>& tokens)
{
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
auto const& token = tokens.consume_a_token();
if (!token.is(Token::Type::Ident))
return {};
transaction.commit();
auto ident = token.token().ident();
return media_type_from_string(ident);
}
// `<media-in-parens>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-in-parens
OwnPtr<MediaCondition> Parser::parse_media_in_parens(TokenStream<ComponentValue>& tokens)
{
// `<media-in-parens> = ( <media-condition> ) | ( <media-feature> ) | <general-enclosed>`
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
// `( <media-condition> ) | ( <media-feature> )`
auto const& first_token = tokens.next_token();
if (first_token.is_block() && first_token.block().is_paren()) {
TokenStream inner_token_stream { first_token.block().values() };
if (auto maybe_media_condition = parse_media_condition(inner_token_stream, MediaCondition::AllowOr::Yes)) {
tokens.discard_a_token();
transaction.commit();
return maybe_media_condition.release_nonnull();
}
if (auto maybe_media_feature = parse_media_feature(inner_token_stream); maybe_media_feature.has_value()) {
tokens.discard_a_token();
transaction.commit();
return MediaCondition::from_feature(maybe_media_feature.release_value());
}
}
// `<general-enclosed>`
// FIXME: We should only be taking this branch if the grammar doesn't match the above options.
// Currently we take it if the above fail to parse, which is different.
// eg, `@media (min-width: 76yaks)` is valid grammar, but does not parse because `yaks` isn't a unit.
if (auto maybe_general_enclosed = parse_general_enclosed(tokens); maybe_general_enclosed.has_value()) {
transaction.commit();
return MediaCondition::from_general_enclosed(maybe_general_enclosed.release_value());
}
return {};
}
// `<mf-value>`, https://www.w3.org/TR/mediaqueries-4/#typedef-mf-value
Optional<MediaFeatureValue> Parser::parse_media_feature_value(MediaFeatureID media_feature, TokenStream<ComponentValue>& tokens)
{
// NOTE: Calculations are not allowed for media feature values, at least in the current spec, so we reject them.
// Identifiers
if (tokens.next_token().is(Token::Type::Ident)) {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
auto keyword = keyword_from_string(tokens.consume_a_token().token().ident());
if (keyword.has_value() && media_feature_accepts_keyword(media_feature, keyword.value())) {
transaction.commit();
return MediaFeatureValue(keyword.value());
}
}
// One branch for each member of the MediaFeatureValueType enum:
// Boolean (<mq-boolean> in the spec: a 1 or 0)
if (media_feature_accepts_type(media_feature, MediaFeatureValueType::Boolean)) {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto integer = parse_integer(tokens); integer.has_value() && !integer->is_calculated()) {
auto integer_value = integer->value();
if (integer_value == 0 || integer_value == 1) {
transaction.commit();
return MediaFeatureValue(integer_value);
}
}
}
// Integer
if (media_feature_accepts_type(media_feature, MediaFeatureValueType::Integer)) {
auto transaction = tokens.begin_transaction();
if (auto integer = parse_integer(tokens); integer.has_value() && !integer->is_calculated()) {
transaction.commit();
return MediaFeatureValue(integer->value());
}
}
// Length
if (media_feature_accepts_type(media_feature, MediaFeatureValueType::Length)) {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto length = parse_length(tokens); length.has_value() && !length->is_calculated()) {
transaction.commit();
return MediaFeatureValue(length->value());
}
}
// Ratio
if (media_feature_accepts_type(media_feature, MediaFeatureValueType::Ratio)) {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto ratio = parse_ratio(tokens); ratio.has_value()) {
transaction.commit();
return MediaFeatureValue(ratio.release_value());
}
}
// Resolution
if (media_feature_accepts_type(media_feature, MediaFeatureValueType::Resolution)) {
auto transaction = tokens.begin_transaction();
tokens.discard_whitespace();
if (auto resolution = parse_resolution(tokens); resolution.has_value() && !resolution->is_calculated()) {
transaction.commit();
return MediaFeatureValue(resolution->value());
}
}
return {};
}
JS::GCPtr<CSSMediaRule> Parser::convert_to_media_rule(Rule& rule)
{
if (!rule.block()) {
dbgln_if(CSS_PARSER_DEBUG, "Failed to parse @media rule: No block.");
return {};
}
auto media_query_tokens = TokenStream { rule.prelude() };
auto media_query_list = parse_a_media_query_list(media_query_tokens);
auto child_tokens = TokenStream { rule.block()->values() };
auto parser_rules = parse_a_list_of_rules(child_tokens);
JS::MarkedVector<CSSRule*> child_rules(m_context.realm().heap());
for (auto& raw_rule : parser_rules) {
if (auto child_rule = convert_to_rule(raw_rule))
child_rules.append(child_rule);
}
auto media_list = MediaList::create(m_context.realm(), move(media_query_list));
auto rule_list = CSSRuleList::create(m_context.realm(), child_rules);
return CSSMediaRule::create(m_context.realm(), media_list, rule_list);
}
}
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