mirror of
https://github.com/LadybirdBrowser/ladybird.git
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f88c093f93
Specifically we will need to know the parent rules for a nested style rule inside `@scope` in order to resolve its selectors correctly. Reusing our existing m_rule_context stack is the simplest option - once we reach the point of converting rules, this context stack is empty, so we can populate it as we go.
711 lines
30 KiB
C++
711 lines
30 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) 2021-2026, 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 <LibWeb/CSS/CSSFunctionDeclarations.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/ContainerQuery.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/ErrorReporter.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/QueryValueType.h>
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#include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
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#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
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#include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.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 = [&](String&& description) {
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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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ErrorReporter::the().report(InvalidQueryError {
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.query_type = "@media"_fly_string,
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.value_string = tokens.dump_string(),
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.description = move(description),
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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("Trailing tokens after <media-condition>"_string);
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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("Doesn't match `<media-query>`"_string);
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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("Contains top-level `or`"_string);
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tokens.discard_whitespace();
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if (tokens.has_next_token())
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return invalid_media_query("Trailing tokens after `<media-condition-without-or>`"_string);
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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("Missing `<media-condition>` after `and`"_string);
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}
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return invalid_media_query("Trailing tokens after `<media-query>`"_string);
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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>& outer_tokens) -> OwnPtr<BooleanExpression> {
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auto transaction = outer_tokens.begin_transaction();
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outer_tokens.discard_whitespace();
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if (!(outer_tokens.next_token().is_block() && outer_tokens.next_token().block().is_paren()))
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return nullptr;
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auto const& block = outer_tokens.consume_a_token().block();
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TokenStream inner_tokens { block.value };
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if (auto maybe_media_feature = parse_media_feature(inner_tokens)) {
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transaction.commit();
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return maybe_media_feature;
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}
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return nullptr;
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});
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}
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enum class FeatureNameType : u8 {
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Normal,
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Min,
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Max,
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};
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template<typename FeatureID>
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struct FeatureName {
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FeatureNameType type;
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FeatureID id;
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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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static Optional<FeatureComparison> parse_feature_comparison(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& 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 FeatureComparison::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 FeatureComparison::LessThanOrEqual;
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}
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transaction.commit();
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return FeatureComparison::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 FeatureComparison::GreaterThanOrEqual;
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}
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transaction.commit();
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return FeatureComparison::GreaterThan;
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}
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}
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return {};
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}
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template<typename Feature, typename FeatureID, typename FeatureNameFromString, typename ParseFeatureValue, typename AllowsRangeSyntax>
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static OwnPtr<Feature> parse_query_feature(TokenStream<ComponentValue>& inner_tokens, FeatureNameFromString feature_name_from_string, ParseFeatureValue parse_feature_value, AllowsRangeSyntax allows_range_syntax)
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{
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auto transaction = inner_tokens.begin_transaction();
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// `<mf-name> = <ident>`
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auto parse_feature_name = [&](auto& tokens, bool allow_min_max_prefix) -> Optional<FeatureName<FeatureID>> {
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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 = feature_name_from_string(name); id.has_value()) {
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transaction.commit();
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return FeatureName<FeatureID> { FeatureNameType::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 = feature_name_from_string(adjusted_name); id.has_value() && allows_range_syntax(id.value())) {
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transaction.commit();
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return FeatureName<FeatureID> {
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name.starts_with_bytes("min-"sv, CaseSensitivity::CaseInsensitive) ? FeatureNameType::Min : FeatureNameType::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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auto parse_feature_boolean = [&](auto& tokens) -> OwnPtr<Feature> {
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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_feature_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 Feature::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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auto parse_feature_plain = [&](auto& tokens) -> OwnPtr<Feature> {
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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_feature_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_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 FeatureNameType::Normal:
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return Feature::plain(maybe_name->id, maybe_value.release_value());
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case FeatureNameType::Min:
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return Feature::min(maybe_name->id, maybe_value.release_value());
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case FeatureNameType::Max:
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return Feature::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-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_feature_range = [&](auto& tokens) -> OwnPtr<Feature> {
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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_feature_name(tokens, false); maybe_name.has_value() && allows_range_syntax(maybe_name->id)) {
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tokens.discard_whitespace();
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if (auto maybe_comparison = parse_feature_comparison(tokens); maybe_comparison.has_value()) {
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tokens.discard_whitespace();
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if (auto maybe_value = parse_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 Feature::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<FeatureName<FeatureID>> 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_feature_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_feature_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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if (maybe_name.has_value() && allows_range_syntax(maybe_name->id)) {
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if (auto maybe_left_value = parse_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_feature_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 Feature::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_feature_comparison(tokens); maybe_right_comparison.has_value()) {
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tokens.discard_whitespace();
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if (auto maybe_right_value = parse_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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&& feature_comparisons_match(left_comparison, right_comparison)
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&& left_comparison != FeatureComparison::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 Feature::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_feature_boolean = parse_feature_boolean(inner_tokens)) {
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inner_tokens.discard_whitespace();
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if (inner_tokens.has_next_token())
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return nullptr;
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transaction.commit();
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return maybe_feature_boolean.release_nonnull();
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}
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if (auto maybe_feature_plain = parse_feature_plain(inner_tokens)) {
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inner_tokens.discard_whitespace();
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if (inner_tokens.has_next_token())
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return nullptr;
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transaction.commit();
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return maybe_feature_plain.release_nonnull();
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}
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if (auto maybe_feature_range = parse_feature_range(inner_tokens)) {
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inner_tokens.discard_whitespace();
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if (inner_tokens.has_next_token())
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return nullptr;
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transaction.commit();
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return maybe_feature_range.release_nonnull();
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}
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return {};
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}
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// `<media-feature>`, https://drafts.csswg.org/mediaqueries-5/#typedef-media-feature
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OwnPtr<MediaFeature> Parser::parse_media_feature(TokenStream<ComponentValue>& inner_tokens)
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{
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return parse_query_feature<MediaFeature, MediaFeatureID>(
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inner_tokens,
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[](StringView name) { return media_feature_id_from_string(name); },
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[this](MediaFeatureID id, auto& tokens) { return parse_media_feature_value(id, tokens); },
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[](MediaFeatureID id) { return media_feature_type_is_range(id); });
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}
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// `<size-feature>`, https://drafts.csswg.org/css-conditional-5/#size-container
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OwnPtr<SizeFeature> Parser::parse_size_feature(TokenStream<ComponentValue>& inner_tokens)
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{
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return parse_query_feature<SizeFeature, SizeFeatureID>(
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inner_tokens,
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[](StringView name) { return size_feature_id_from_string(name); },
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[this](SizeFeatureID id, auto& tokens) { return parse_size_feature_value(id, tokens); },
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[](SizeFeatureID id) { return size_feature_type_is_range(id); });
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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
|
||
// the IDENT production, they must not be treated as unknown media types, but rather trigger the malformed query clause."
|
||
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))
|
||
return {};
|
||
|
||
transaction.commit();
|
||
|
||
auto const& ident = token.token().ident();
|
||
return MediaQuery::MediaType {
|
||
.name = ident,
|
||
.known_type = media_type_from_string(ident),
|
||
};
|
||
}
|
||
|
||
static bool is_feature_value_token(ComponentValue const& component_value)
|
||
{
|
||
if (!component_value.is_token())
|
||
return true;
|
||
switch (component_value.token().type()) {
|
||
case Token::Type::Ident:
|
||
case Token::Type::Function:
|
||
case Token::Type::AtKeyword:
|
||
case Token::Type::Hash:
|
||
case Token::Type::String:
|
||
case Token::Type::BadString:
|
||
case Token::Type::Url:
|
||
case Token::Type::BadUrl:
|
||
case Token::Type::Number:
|
||
case Token::Type::Percentage:
|
||
case Token::Type::Dimension:
|
||
case Token::Type::Whitespace:
|
||
case Token::Type::Comma:
|
||
return true;
|
||
case Token::Type::Delim:
|
||
// FIXME: What list of delimiters should we actually allow here?
|
||
return !first_is_one_of(component_value.token().delim(), static_cast<u32>('<'), static_cast<u32>('>'), static_cast<u32>('='));
|
||
case Token::Type::Invalid:
|
||
case Token::Type::EndOfFile:
|
||
case Token::Type::CDO:
|
||
case Token::Type::CDC:
|
||
case Token::Type::Colon:
|
||
case Token::Type::Semicolon:
|
||
case Token::Type::OpenSquare:
|
||
case Token::Type::CloseSquare:
|
||
case Token::Type::OpenParen:
|
||
case Token::Type::CloseParen:
|
||
case Token::Type::OpenCurly:
|
||
case Token::Type::CloseCurly:
|
||
return false;
|
||
}
|
||
VERIFY_NOT_REACHED();
|
||
}
|
||
|
||
template<typename FeatureID, typename FeatureAcceptsKeyword, typename FeatureAcceptsType>
|
||
Optional<FeatureValue> Parser::parse_feature_value(FeatureID feature, TokenStream<ComponentValue>& tokens, FeatureAcceptsKeyword feature_accepts_keyword, FeatureAcceptsType feature_accepts_type)
|
||
{
|
||
{
|
||
auto transaction = tokens.begin_transaction();
|
||
auto value = [&](FeatureID feature, TokenStream<ComponentValue>& tokens) -> Optional<FeatureValue> {
|
||
auto context_guard = push_temporary_value_parsing_context(SpecialContext::MediaCondition);
|
||
|
||
// One branch for each member of the QueryValueType enum:
|
||
// Identifiers
|
||
if (tokens.next_token().is(Token::Type::Ident)) {
|
||
auto transaction = tokens.begin_transaction();
|
||
tokens.discard_whitespace();
|
||
auto keyword = parse_keyword_value(tokens);
|
||
if (keyword && feature_accepts_keyword(feature, keyword->to_keyword())) {
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Ident, keyword.release_nonnull());
|
||
}
|
||
}
|
||
|
||
// Boolean (<mq-boolean> in the spec: a 1 or 0)
|
||
if (feature_accepts_type(feature, QueryValueType::Boolean)) {
|
||
auto transaction = tokens.begin_transaction();
|
||
tokens.discard_whitespace();
|
||
if (auto integer = parse_integer_value(tokens, infinite_integer_range)) {
|
||
if (integer->is_calculated() || first_is_one_of(integer->as_integer().integer(), 0, 1)) {
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Integer, integer.release_nonnull());
|
||
}
|
||
}
|
||
}
|
||
|
||
// Integer
|
||
if (feature_accepts_type(feature, QueryValueType::Integer)) {
|
||
auto transaction = tokens.begin_transaction();
|
||
if (auto integer = parse_integer_value(tokens, infinite_integer_range)) {
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Integer, integer.release_nonnull());
|
||
}
|
||
}
|
||
|
||
// Length
|
||
if (feature_accepts_type(feature, QueryValueType::Length)) {
|
||
auto transaction = tokens.begin_transaction();
|
||
tokens.discard_whitespace();
|
||
if (auto length = parse_length_value(tokens, infinite_range)) {
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Length, length.release_nonnull());
|
||
}
|
||
|
||
// https://drafts.csswg.org/mediaqueries-5/#typedef-mf-value
|
||
// <mf-value> = <number> | <dimension> | <ident> | <ratio>
|
||
//
|
||
// https://drafts.csswg.org/css-values-4/#lengths
|
||
// "For zero lengths the unit identifier is optional"
|
||
//
|
||
// https://drafts.csswg.org/css-values-4/#zero-value
|
||
// "Values of '0' can be written without units, even if the
|
||
// value type doesn't allow 'unitless zeroes'."
|
||
if (tokens.has_next_token()) {
|
||
auto const& token = tokens.next_token();
|
||
if (auto calc = parse_calculated_value(token, { .accepted_ranges_by_type = { { ValueType::Number, infinite_range } } }); calc && calc->as_calculated().resolves_to_number()) {
|
||
if (auto resolved_number = calc->as_calculated().resolve_number({}); resolved_number.has_value() && *resolved_number == 0) {
|
||
tokens.discard_a_token();
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Length, LengthStyleValue::create(Length::make_px(0)));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// Ratio
|
||
if (feature_accepts_type(feature, QueryValueType::Ratio)) {
|
||
auto transaction = tokens.begin_transaction();
|
||
tokens.discard_whitespace();
|
||
if (auto ratio = parse_ratio_value(tokens)) {
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Ratio, ratio.release_nonnull());
|
||
}
|
||
}
|
||
|
||
// Resolution
|
||
if (feature_accepts_type(feature, QueryValueType::Resolution)) {
|
||
auto transaction = tokens.begin_transaction();
|
||
tokens.discard_whitespace();
|
||
if (auto resolution = parse_resolution_value(tokens, infinite_range)) {
|
||
transaction.commit();
|
||
return FeatureValue(FeatureValue::Type::Resolution, resolution.release_nonnull());
|
||
}
|
||
}
|
||
|
||
return {};
|
||
}(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_feature_value_token(tokens.next_token())) {
|
||
transaction.commit();
|
||
return value.release_value();
|
||
}
|
||
}
|
||
}
|
||
|
||
// Parsing failed somehow, so wrap all the tokens into an "unknown" FeatureValue 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_feature_value_token(tokens.next_token())) {
|
||
unknown_tokens.append(tokens.consume_a_token());
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!unknown_tokens.is_empty()) {
|
||
transaction.commit();
|
||
ErrorReporter::the().report(InvalidValueError {
|
||
.value_type = "<mf-value>"_fly_string,
|
||
.value_string = MUST(String::join(""sv, unknown_tokens)),
|
||
.description = "Unrecognized type"_string,
|
||
});
|
||
// NB: We only use this for serialization so the substitution function presence is irrelevant and we can just
|
||
// set it to empty.
|
||
return FeatureValue(FeatureValue::Type::Unknown, move(UnresolvedStyleValue::create(move(unknown_tokens), {})));
|
||
}
|
||
|
||
return {};
|
||
}
|
||
|
||
// `<mf-value>`, https://www.w3.org/TR/mediaqueries-4/#typedef-mf-value
|
||
Optional<FeatureValue> Parser::parse_media_feature_value(MediaFeatureID feature, TokenStream<ComponentValue>& tokens)
|
||
{
|
||
return parse_feature_value(
|
||
feature,
|
||
tokens,
|
||
[](MediaFeatureID feature, Keyword keyword) { return media_feature_accepts_keyword(feature, keyword); },
|
||
[](MediaFeatureID feature, QueryValueType type) { return media_feature_accepts_type(feature, type); });
|
||
}
|
||
|
||
Optional<FeatureValue> Parser::parse_size_feature_value(SizeFeatureID feature, TokenStream<ComponentValue>& tokens)
|
||
{
|
||
auto size_feature_accepts_keyword = [](SizeFeatureID feature, Keyword keyword) {
|
||
return feature == SizeFeatureID::Orientation && first_is_one_of(keyword, Keyword::Landscape, Keyword::Portrait);
|
||
};
|
||
auto size_feature_accepts_type = [](SizeFeatureID feature, QueryValueType type) {
|
||
switch (type) {
|
||
case QueryValueType::Length:
|
||
return first_is_one_of(feature,
|
||
SizeFeatureID::BlockSize,
|
||
SizeFeatureID::Height,
|
||
SizeFeatureID::InlineSize,
|
||
SizeFeatureID::Width);
|
||
case QueryValueType::Ratio:
|
||
return feature == SizeFeatureID::AspectRatio;
|
||
default:
|
||
return false;
|
||
}
|
||
};
|
||
return parse_feature_value(feature, tokens, size_feature_accepts_keyword, size_feature_accepts_type);
|
||
}
|
||
|
||
template<typename NestedDeclarationsRule>
|
||
GC::Ptr<CSSMediaRule> Parser::convert_to_media_rule(AtRule const& rule, Nested nested)
|
||
{
|
||
m_rule_context.append(RuleContext::AtMedia);
|
||
ScopeGuard guard = [&] {
|
||
[[maybe_unused]] auto last = m_rule_context.take_last();
|
||
VERIFY(last == RuleContext::AtMedia);
|
||
};
|
||
|
||
// https://drafts.csswg.org/css-conditional-3/#at-media
|
||
// @media <media-query-list> {
|
||
// <rule-list>
|
||
// }
|
||
if (!rule.is_block_rule) {
|
||
ErrorReporter::the().report(CSS::Parser::InvalidRuleError {
|
||
.rule_name = "@media"_fly_string,
|
||
.prelude = MUST(String::join(""sv, rule.prelude)),
|
||
.description = "Expected a block."_string,
|
||
});
|
||
return nullptr;
|
||
}
|
||
|
||
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;
|
||
for (auto const& child : rule.child_rules_and_lists_of_declarations) {
|
||
child.visit(
|
||
[&](Rule const& rule) {
|
||
if (auto child_rule = convert_to_rule<NestedDeclarationsRule>(rule, nested))
|
||
child_rules.append(*child_rule);
|
||
},
|
||
[&](Vector<Declaration> const& declarations) {
|
||
child_rules.append(NestedDeclarationsRule::create(realm(), *this, declarations));
|
||
});
|
||
}
|
||
auto rule_list = CSSRuleList::create(realm(), child_rules);
|
||
return CSSMediaRule::create(realm(), media_list, rule_list);
|
||
}
|
||
|
||
template GC::Ptr<CSSMediaRule> Parser::convert_to_media_rule<CSSNestedDeclarations>(AtRule const&, Parser::Nested);
|
||
template GC::Ptr<CSSMediaRule> Parser::convert_to_media_rule<CSSFunctionDeclarations>(AtRule const&, Parser::Nested);
|
||
|
||
}
|