mirror of
https://github.com/LadybirdBrowser/ladybird.git
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9fe8445946
Previously, for `foo < 30px` ranges, we'd flip them and store them as `30px > foo` instead. That worked fine, but means the serialization is wrong. So instead, keep them in their original form. I experimented with giving Range two optional sub-structs instead of 4 optional members, thinking it would be smaller - but it's actually larger, because the two Optional<Comparison>s fit snugly together. So, the slightly-goofy all-Optionals remains. This gets us 2 WPT passes that I'm aware of.
583 lines
24 KiB
C++
583 lines
24 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2020-2021, the SerenityOS developers.
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* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Debug.h>
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#include <LibWeb/CSS/CSSMediaRule.h>
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#include <LibWeb/CSS/CSSNestedDeclarations.h>
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#include <LibWeb/CSS/CalculatedOr.h>
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#include <LibWeb/CSS/MediaList.h>
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#include <LibWeb/CSS/MediaQuery.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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namespace Web::CSS::Parser {
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Vector<NonnullRefPtr<MediaQuery>> Parser::parse_as_media_query_list()
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{
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return parse_a_media_query_list(m_token_stream);
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}
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template<typename T>
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Vector<NonnullRefPtr<MediaQuery>> Parser::parse_a_media_query_list(TokenStream<T>& tokens)
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{
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// https://www.w3.org/TR/mediaqueries-4/#mq-list
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// AD-HOC: Ignore whitespace-only queries
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// to make `@media {..}` equivalent to `@media all {..}`
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tokens.discard_whitespace();
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if (!tokens.has_next_token())
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return {};
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auto comma_separated_lists = parse_a_comma_separated_list_of_component_values(tokens);
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AK::Vector<NonnullRefPtr<MediaQuery>> media_queries;
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for (auto& media_query_parts : comma_separated_lists) {
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auto stream = TokenStream(media_query_parts);
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media_queries.append(parse_media_query(stream));
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}
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return media_queries;
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}
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RefPtr<MediaQuery> Parser::parse_as_media_query()
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{
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// https://www.w3.org/TR/cssom-1/#parse-a-media-query
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auto media_query_list = parse_as_media_query_list();
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if (media_query_list.is_empty())
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return MediaQuery::create_not_all();
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if (media_query_list.size() == 1)
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return media_query_list.first();
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return nullptr;
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}
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// `<media-query>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-query
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NonnullRefPtr<MediaQuery> Parser::parse_media_query(TokenStream<ComponentValue>& tokens)
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{
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// `<media-query> = <media-condition>
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// | [ not | only ]? <media-type> [ and <media-condition-without-or> ]?`
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// `[ not | only ]?`, Returns whether to negate the query
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auto parse_initial_modifier = [](auto& tokens) -> Optional<bool> {
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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auto& token = tokens.consume_a_token();
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if (!token.is(Token::Type::Ident))
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return {};
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auto ident = token.token().ident();
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if (ident.equals_ignoring_ascii_case("not"sv)) {
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transaction.commit();
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return true;
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}
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if (ident.equals_ignoring_ascii_case("only"sv)) {
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transaction.commit();
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return false;
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}
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return {};
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};
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auto invalid_media_query = [&]() {
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// "A media query that does not match the grammar in the previous section must be replaced by `not all`
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// during parsing." - https://www.w3.org/TR/mediaqueries-5/#error-handling
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if constexpr (CSS_PARSER_DEBUG) {
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dbgln("Invalid media query:");
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tokens.dump_all_tokens();
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}
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return MediaQuery::create_not_all();
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};
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auto media_query = MediaQuery::create();
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tokens.discard_whitespace();
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// `<media-condition>`
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if (auto media_condition = parse_media_condition(tokens)) {
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tokens.discard_whitespace();
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if (tokens.has_next_token())
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return invalid_media_query();
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media_query->m_media_condition = media_condition.release_nonnull();
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return media_query;
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}
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// `[ not | only ]?`
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if (auto modifier = parse_initial_modifier(tokens); modifier.has_value()) {
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media_query->m_negated = modifier.value();
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tokens.discard_whitespace();
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}
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// `<media-type>`
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if (auto media_type = parse_media_type(tokens); media_type.has_value()) {
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media_query->m_media_type = media_type.release_value();
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tokens.discard_whitespace();
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} else {
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// https://drafts.csswg.org/mediaqueries-4/#error-handling
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// A media query that does not match the grammar in the previous section must be replaced by not all during parsing.
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return invalid_media_query();
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}
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if (!tokens.has_next_token())
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return media_query;
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// `[ and <media-condition-without-or> ]?`
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if (auto const& maybe_and = tokens.consume_a_token(); maybe_and.is_ident("and"sv)) {
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if (auto media_condition = parse_media_condition(tokens)) {
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// "or" is disallowed at the top level
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if (is<BooleanOrExpression>(*media_condition))
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return invalid_media_query();
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tokens.discard_whitespace();
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if (tokens.has_next_token())
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return invalid_media_query();
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media_query->m_media_condition = move(media_condition);
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return media_query;
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}
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return invalid_media_query();
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}
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return invalid_media_query();
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}
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// `<media-condition>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-condition
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OwnPtr<BooleanExpression> Parser::parse_media_condition(TokenStream<ComponentValue>& tokens)
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{
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return parse_boolean_expression(tokens, MatchResult::Unknown, [this](TokenStream<ComponentValue>& tokens) -> OwnPtr<BooleanExpression> {
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return parse_media_feature(tokens);
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});
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}
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// `<media-feature>`, https://www.w3.org/TR/mediaqueries-4/#typedef-media-feature
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OwnPtr<MediaFeature> Parser::parse_media_feature(TokenStream<ComponentValue>& tokens)
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{
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// `[ <mf-plain> | <mf-boolean> | <mf-range> ]`
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tokens.discard_whitespace();
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// `<mf-name> = <ident>`
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struct MediaFeatureName {
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enum Type {
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Normal,
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Min,
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Max
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} type;
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MediaFeatureID id;
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};
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auto parse_mf_name = [](auto& tokens, bool allow_min_max_prefix) -> Optional<MediaFeatureName> {
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auto transaction = tokens.begin_transaction();
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auto& token = tokens.consume_a_token();
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if (token.is(Token::Type::Ident)) {
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auto name = token.token().ident();
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if (auto id = media_feature_id_from_string(name); id.has_value()) {
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transaction.commit();
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return MediaFeatureName { MediaFeatureName::Type::Normal, id.value() };
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}
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if (allow_min_max_prefix && (name.starts_with_bytes("min-"sv, CaseSensitivity::CaseInsensitive) || name.starts_with_bytes("max-"sv, CaseSensitivity::CaseInsensitive))) {
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auto adjusted_name = name.bytes_as_string_view().substring_view(4);
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if (auto id = media_feature_id_from_string(adjusted_name); id.has_value() && media_feature_type_is_range(id.value())) {
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transaction.commit();
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return MediaFeatureName {
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name.starts_with_bytes("min-"sv, CaseSensitivity::CaseInsensitive) ? MediaFeatureName::Type::Min : MediaFeatureName::Type::Max,
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id.value()
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};
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}
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}
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}
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return {};
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};
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// `<mf-boolean> = <mf-name>`
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auto parse_mf_boolean = [&](auto& tokens) -> OwnPtr<MediaFeature> {
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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if (auto maybe_name = parse_mf_name(tokens, false); maybe_name.has_value()) {
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tokens.discard_whitespace();
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if (!tokens.has_next_token()) {
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transaction.commit();
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return MediaFeature::boolean(maybe_name->id);
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}
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}
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return {};
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};
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// `<mf-plain> = <mf-name> : <mf-value>`
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auto parse_mf_plain = [&](auto& tokens) -> OwnPtr<MediaFeature> {
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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if (auto maybe_name = parse_mf_name(tokens, true); maybe_name.has_value()) {
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tokens.discard_whitespace();
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if (tokens.consume_a_token().is(Token::Type::Colon)) {
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tokens.discard_whitespace();
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if (auto maybe_value = parse_media_feature_value(maybe_name->id, tokens); maybe_value.has_value()) {
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tokens.discard_whitespace();
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if (!tokens.has_next_token()) {
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transaction.commit();
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switch (maybe_name->type) {
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case MediaFeatureName::Type::Normal:
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return MediaFeature::plain(maybe_name->id, maybe_value.release_value());
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case MediaFeatureName::Type::Min:
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return MediaFeature::min(maybe_name->id, maybe_value.release_value());
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case MediaFeatureName::Type::Max:
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return MediaFeature::max(maybe_name->id, maybe_value.release_value());
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}
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VERIFY_NOT_REACHED();
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}
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}
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}
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}
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return {};
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};
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// `<mf-lt> = '<' '='?
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// <mf-gt> = '>' '='?
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// <mf-eq> = '='
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// <mf-comparison> = <mf-lt> | <mf-gt> | <mf-eq>`
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auto parse_comparison = [](auto& tokens) -> Optional<MediaFeature::Comparison> {
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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auto& first = tokens.consume_a_token();
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if (first.is(Token::Type::Delim)) {
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auto first_delim = first.token().delim();
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if (first_delim == '=') {
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transaction.commit();
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return MediaFeature::Comparison::Equal;
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}
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if (first_delim == '<') {
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auto& second = tokens.next_token();
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if (second.is_delim('=')) {
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tokens.discard_a_token();
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transaction.commit();
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return MediaFeature::Comparison::LessThanOrEqual;
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}
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transaction.commit();
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return MediaFeature::Comparison::LessThan;
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}
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if (first_delim == '>') {
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auto& second = tokens.next_token();
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if (second.is_delim('=')) {
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tokens.discard_a_token();
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transaction.commit();
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return MediaFeature::Comparison::GreaterThanOrEqual;
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}
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transaction.commit();
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return MediaFeature::Comparison::GreaterThan;
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}
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}
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return {};
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};
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auto comparisons_match = [](MediaFeature::Comparison a, MediaFeature::Comparison b) -> bool {
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switch (a) {
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case MediaFeature::Comparison::Equal:
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return b == MediaFeature::Comparison::Equal;
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case MediaFeature::Comparison::LessThan:
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case MediaFeature::Comparison::LessThanOrEqual:
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return b == MediaFeature::Comparison::LessThan || b == MediaFeature::Comparison::LessThanOrEqual;
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case MediaFeature::Comparison::GreaterThan:
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case MediaFeature::Comparison::GreaterThanOrEqual:
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return b == MediaFeature::Comparison::GreaterThan || b == MediaFeature::Comparison::GreaterThanOrEqual;
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}
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VERIFY_NOT_REACHED();
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};
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// `<mf-range> = <mf-name> <mf-comparison> <mf-value>
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// | <mf-value> <mf-comparison> <mf-name>
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// | <mf-value> <mf-lt> <mf-name> <mf-lt> <mf-value>
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// | <mf-value> <mf-gt> <mf-name> <mf-gt> <mf-value>`
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auto parse_mf_range = [&](auto& tokens) -> OwnPtr<MediaFeature> {
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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// `<mf-name> <mf-comparison> <mf-value>`
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// NOTE: We have to check for <mf-name> first, since all <mf-name>s will also parse as <mf-value>.
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if (auto maybe_name = parse_mf_name(tokens, false); maybe_name.has_value()) {
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tokens.discard_whitespace();
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if (auto maybe_comparison = parse_comparison(tokens); maybe_comparison.has_value()) {
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tokens.discard_whitespace();
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if (auto maybe_value = parse_media_feature_value(maybe_name->id, tokens); maybe_value.has_value()) {
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tokens.discard_whitespace();
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if (!tokens.has_next_token() && !maybe_value->is_ident()) {
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transaction.commit();
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return MediaFeature::half_range(maybe_name->id, maybe_comparison.release_value(), maybe_value.release_value());
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}
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}
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}
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}
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// `<mf-value> <mf-comparison> <mf-name>
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// | <mf-value> <mf-lt> <mf-name> <mf-lt> <mf-value>
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// | <mf-value> <mf-gt> <mf-name> <mf-gt> <mf-value>`
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// NOTE: To parse the first value, we need to first find and parse the <mf-name> so we know what value types to parse.
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// To allow for <mf-value> to be any number of tokens long, we scan forward until we find a comparison, and then
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// treat the next non-whitespace token as the <mf-name>, which should be correct as long as they don't add a value
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// type that can include a comparison in it. :^)
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Optional<MediaFeatureName> maybe_name;
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{
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// This transaction is never committed, we just use it to rewind automatically.
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auto temp_transaction = tokens.begin_transaction();
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while (tokens.has_next_token() && !maybe_name.has_value()) {
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if (auto maybe_comparison = parse_comparison(tokens); maybe_comparison.has_value()) {
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// We found a comparison, so the next non-whitespace token should be the <mf-name>
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tokens.discard_whitespace();
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maybe_name = parse_mf_name(tokens, false);
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break;
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}
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tokens.discard_a_token();
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tokens.discard_whitespace();
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}
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}
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// Now, we can parse the range properly.
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if (maybe_name.has_value()) {
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if (auto maybe_left_value = parse_media_feature_value(maybe_name->id, tokens); maybe_left_value.has_value()) {
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tokens.discard_whitespace();
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if (auto maybe_left_comparison = parse_comparison(tokens); maybe_left_comparison.has_value()) {
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tokens.discard_whitespace();
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tokens.discard_a_token(); // The <mf-name> which we already parsed above.
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tokens.discard_whitespace();
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if (!tokens.has_next_token()) {
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transaction.commit();
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return MediaFeature::half_range(maybe_left_value.release_value(), maybe_left_comparison.release_value(), maybe_name->id);
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}
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if (auto maybe_right_comparison = parse_comparison(tokens); maybe_right_comparison.has_value()) {
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tokens.discard_whitespace();
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if (auto maybe_right_value = parse_media_feature_value(maybe_name->id, tokens); maybe_right_value.has_value()) {
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tokens.discard_whitespace();
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// For this to be valid, the following must be true:
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// - Comparisons must either both be >/>= or both be </<=.
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// - Neither comparison can be `=`.
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// - Neither value can be an ident.
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auto left_comparison = maybe_left_comparison.release_value();
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auto right_comparison = maybe_right_comparison.release_value();
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if (!tokens.has_next_token()
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&& comparisons_match(left_comparison, right_comparison)
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&& left_comparison != MediaFeature::Comparison::Equal
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&& !maybe_left_value->is_ident() && !maybe_right_value->is_ident()) {
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transaction.commit();
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return MediaFeature::range(maybe_left_value.release_value(), left_comparison, maybe_name->id, right_comparison, maybe_right_value.release_value());
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}
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}
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}
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}
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}
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}
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return {};
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};
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if (auto maybe_mf_boolean = parse_mf_boolean(tokens))
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return maybe_mf_boolean.release_nonnull();
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if (auto maybe_mf_plain = parse_mf_plain(tokens))
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return maybe_mf_plain.release_nonnull();
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if (auto maybe_mf_range = parse_mf_range(tokens))
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return maybe_mf_range.release_nonnull();
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return {};
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}
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Optional<MediaQuery::MediaType> Parser::parse_media_type(TokenStream<ComponentValue>& tokens)
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{
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auto transaction = tokens.begin_transaction();
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tokens.discard_whitespace();
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auto const& token = tokens.consume_a_token();
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if (!token.is(Token::Type::Ident))
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return {};
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// https://drafts.csswg.org/mediaqueries-3/#error-handling
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// "However, an exception is made for media types ‘layer’, ‘not’, ‘and’, ‘only’, and ‘or’. Even though they do match
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// the IDENT production, they must not be treated as unknown media types, but rather trigger the malformed query clause."
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if (token.is_ident("layer"sv) || token.is_ident("not"sv) || token.is_ident("and"sv) || token.is_ident("only"sv) || token.is_ident("or"sv))
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return {};
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|
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transaction.commit();
|
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auto const& ident = token.token().ident();
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return MediaQuery::MediaType {
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.name = ident,
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.known_type = media_type_from_string(ident),
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};
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}
|
||
|
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static bool is_media_feature_value_token(ComponentValue const& component_value)
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{
|
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if (!component_value.is_token())
|
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return true;
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switch (component_value.token().type()) {
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case Token::Type::Ident:
|
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case Token::Type::Function:
|
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case Token::Type::AtKeyword:
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case Token::Type::Hash:
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case Token::Type::String:
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case Token::Type::BadString:
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case Token::Type::Url:
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case Token::Type::BadUrl:
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case Token::Type::Number:
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case Token::Type::Percentage:
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case Token::Type::Dimension:
|
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case Token::Type::Whitespace:
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case Token::Type::Comma:
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return true;
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case Token::Type::Delim:
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// FIXME: What list of delimiters should we actually allow here?
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return !first_is_one_of(component_value.token().delim(), static_cast<u32>('<'), static_cast<u32>('>'), static_cast<u32>('='));
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case Token::Type::Invalid:
|
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case Token::Type::EndOfFile:
|
||
case Token::Type::CDO:
|
||
case Token::Type::CDC:
|
||
case Token::Type::Colon:
|
||
case Token::Type::Semicolon:
|
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case Token::Type::OpenSquare:
|
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case Token::Type::CloseSquare:
|
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case Token::Type::OpenParen:
|
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case Token::Type::CloseParen:
|
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case Token::Type::OpenCurly:
|
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case Token::Type::CloseCurly:
|
||
return false;
|
||
}
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
|
||
// `<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)
|
||
{
|
||
{
|
||
auto transaction = tokens.begin_transaction();
|
||
auto value = [this](MediaFeatureID media_feature, TokenStream<ComponentValue>& tokens) -> Optional<MediaFeatureValue> {
|
||
// One branch for each member of the MediaFeatureValueType enum:
|
||
// 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());
|
||
}
|
||
}
|
||
|
||
// 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()) {
|
||
if (integer.value().is_calculated() || integer->value() == 0 || integer->value() == 1) {
|
||
transaction.commit();
|
||
return MediaFeatureValue(integer.release_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()) {
|
||
transaction.commit();
|
||
return MediaFeatureValue(integer.release_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()) {
|
||
transaction.commit();
|
||
return MediaFeatureValue(length.release_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()) {
|
||
transaction.commit();
|
||
return MediaFeatureValue(resolution.release_value());
|
||
}
|
||
}
|
||
|
||
return {};
|
||
}(media_feature, tokens);
|
||
|
||
if (value.has_value()) {
|
||
tokens.discard_whitespace();
|
||
|
||
// Only returned the value if there are no trailing tokens.
|
||
// Otherwise, the transaction gets reverted and we consume all the value tokens below.
|
||
if (!is_media_feature_value_token(tokens.next_token())) {
|
||
transaction.commit();
|
||
return value.release_value();
|
||
}
|
||
}
|
||
}
|
||
|
||
// Parsing failed somehow, so wrap all the tokens into an "unknown" MediaFeatureValue if possible.
|
||
|
||
auto transaction = tokens.begin_transaction();
|
||
tokens.discard_whitespace();
|
||
Vector<ComponentValue> unknown_tokens;
|
||
|
||
// Consume any tokens that could be part of a value.
|
||
while (tokens.has_next_token()) {
|
||
if (is_media_feature_value_token(tokens.next_token())) {
|
||
unknown_tokens.append(tokens.consume_a_token());
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!unknown_tokens.is_empty()) {
|
||
transaction.commit();
|
||
dbgln_if(CSS_PARSER_DEBUG, "Creating unknown media value: `{}`", String::join(""sv, unknown_tokens));
|
||
return MediaFeatureValue(move(unknown_tokens));
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
GC::Ptr<CSSMediaRule> Parser::convert_to_media_rule(AtRule const& rule, Nested nested)
|
||
{
|
||
auto media_query_tokens = TokenStream { rule.prelude };
|
||
auto media_query_list = parse_a_media_query_list(media_query_tokens);
|
||
auto media_list = MediaList::create(realm(), move(media_query_list));
|
||
|
||
GC::RootVector<GC::Ref<CSSRule>> child_rules { realm().heap() };
|
||
for (auto const& child : rule.child_rules_and_lists_of_declarations) {
|
||
child.visit(
|
||
[&](Rule const& rule) {
|
||
if (auto child_rule = convert_to_rule(rule, nested))
|
||
child_rules.append(*child_rule);
|
||
},
|
||
[&](Vector<Declaration> const& declarations) {
|
||
child_rules.append(CSSNestedDeclarations::create(realm(), *convert_to_style_declaration(declarations)));
|
||
});
|
||
}
|
||
auto rule_list = CSSRuleList::create(realm(), child_rules);
|
||
return CSSMediaRule::create(realm(), media_list, rule_list);
|
||
}
|
||
|
||
}
|